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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549

FORM 10-K

Commission File Number: 0-23556

NEKTAR THERAPEUTICS

(Exact name of registrant as specified in its charter)

        Securities registered pursuant to Section 12(b) of the Act: None

        Securities registered pursuant to Section 12(g) of the Act: Common Stock, $0.0001 par value

        Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ý    No o

        Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of Registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ý

        Indicate by check mark whether the registrant is an accelerated filer (as defined in Exchange Act Rule 12b-2). Yes ý    No o

        The approximate aggregate market value of voting stock held by non-affiliates of the Registrant, based upon the last sale price of the Registrant's Common Stock on June 30, 2003 as reported on the NASDAQ National Market was approximately $478,185,644. This calculation excludes approximately 3,612,181 shares held by directors and executive officers of the Registrant. Exclusion of these shares should not be construed to indicate that such person controls, is controlled by or is under common control with the Registrant. This calculation does not exclude shares held by organizations whose ownership exceeds 5% of the Registrant's outstanding Common Stock as of June 30, 2003 that have represented to the Registrant that they are registered investment advisers or investment companies registered under Section 8 of the Investment Company Act of 1940. Determination of affiliate status for the purposes of this calculation is not necessarily a conclusive determination for any other purpose.

56,983,223
(Number of shares of common stock outstanding as of January 31, 2004)

DOCUMENTS INCORPORATED BY REFERENCE

        Portions of Registrant's definitive Proxy Statement to be filed for its 2004 Annual Meeting of Stockholders are incorporated by reference into Part III hereof.

NEKTAR THERAPEUTICS

2003 ANNUAL REPORT ON FORM 10-K

TABLE OF CONTENTS

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Forward-Looking Statements

        This report includes "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended (the "1933 Act") and Section 21E of the Securities Exchange Act of 1934, as amended (the "1934 Act"). All statements other than statements of historical fact are "forward-looking statements" for purposes of this annual report, including any projections of earnings, revenues or other financial items, any statements of the plans and objectives of management for future operations, any statements concerning proposed new products or services, any statements regarding future economic conditions or performance and any statement of assumptions underlying any of the foregoing. In some cases, forward-looking statements can be identified by the use of terminology such as "may," "will," "expects," "plans," "anticipates," "estimates," "potential," or "continue," or the negative thereof or other comparable terminology. Although we believe that the expectations reflected in the forward-looking statements contained herein are reasonable, there can be no assurance that such expectations or any of the forward-looking statements will prove to be correct and actual results could differ materially from those projected or assumed in the forward-looking statements. Our future financial condition and results of operations, as well as any forward-looking statements, are subject to inherent risks and uncertainties, including but not limited to the risk factors set forth below and for the reasons described elsewhere in this annual report. All forward-looking statements and reasons why results may differ included in this report are made as of the date hereof and we do not intend to update any forward-looking statements except as required by law or applicable regulations.

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PART I

Item 1. Business

Overview

        Nektar Therapeutics is in the business of improving therapeutics through improved drug delivery. Each of our three technology platforms has the ability to transform therapeutics with differentiating properties based on the technology and the particular application of the technology.

        We are working to become one of the world's leading drug delivery products based companies by providing a portfolio of technologies and expertise that will enable us and our pharmaceutical and biotechnology partners to improve drug performance throughout the drug development process.

        Our mission is to provide drug delivery technologies that enable the development and manufacture of superior therapeutics that make a difference in patients' lives. Primarily, we want to partner with pharmaceutical and biotechnology companies seeking to improve and differentiate their marketed products as well as the products in their pipelines. In addition to our partner-funded programs, we have started applying our technologies independently through internal early-stage product development efforts.

        Our technologies are designed to improve either the performance of a drug molecule (e.g., bioavailability, safety, efficacy, stability, targeting, etc.) or how the drug is delivered (e.g., enabling new dosage form or delivery profile that improves how the therapeutic can treat patients). We currently have three technology platforms:

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Nektar Advanced PEGylation Technology—using advanced PEGylation and PEG-based delivery systems to enhance the efficacy and performance of most major drug classes, including macromolecules such as peptides and proteins, smaller sized molecular compounds and other drugs. Nektar Advanced PEGylation Technology, has been approved for use in five products in the U.S. and in another product approved only in Europe.



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Nektar Pulmonary Technology—using our pulmonary expertise in drug formulation and inhalers for systemic and local lung therapies. Nektar Pulmonary Technology is focused on the formulation of molecules and delivery devices for inhalation. Through this technology we are working to improve or enable drug delivery and improve therapeutic outcomes for large and small molecules for systemic and local lung therapies.



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Nektar Supercritical Fluid (SCF) Technology—using a single step particle formulation process that yields consistent powder particles that can be incorporated into a final dosage form such as tablets or capsules. Nektar SCF Technology uses proprietary particle engineering methods designed to develop drug formulations to obtain precision and consistency in particle formulation or to develop beneficial novel formulations, including taste-masking of products and improving the bioavailability of products.

        Our strategy is to enable our partners' drugs through partner-funded programs, and to selectively fund internal early-stage proprietary products with a view to partner prior to late stage clinical development. Our goal is to leverage our technology investments over a large pipeline that allows us to realize value by advancing our partners' and our proprietary products. As we identify the technologies and markets in which we see opportunities to establish leadership positions, we intend to continue to develop or acquire technologies to capitalize on such opportunities.

        We currently have collaborations ongoing with more than 25 biotechnology and pharmaceutical companies, of which 21 are announced. Our product pipeline includes 5 products approved in the United States, 1 additional product approved in Europe, 4 products in Phase III trials, and 12 products in Phase I and Phase II trials.

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        Our strategy incorporates the following principal elements:

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Partner with Pharmaceutical and Biotechnology Companies.    We market our technologies and products through collaborative partners. We currently have collaborations with several large pharmaceutical and biotechnology companies. In a typical pulmonary delivery collaboration, our partner will provide the active pharmaceutical ingredient (the majority of which are already approved by the U.S. Food and Drug Administration ("FDA") in another delivery form), fund clinical and formulation development, obtain regulatory approvals, and market the resulting commercial product. We may manufacture and supply the drug delivery approach or drug formulation, and may receive revenues from drug manufacturing, as well as royalties from sales of most commercial products. In addition, for products using our Pulmonary Technology, we may receive revenues from the supply of our device for the product along with revenues for any applicable drug processing or filling. In a typical advanced PEGylation collaboration, we manufacture and supply the PEG reagents and receive manufacturing revenues and possible royalties from sales of the PEGylated commercial product. Prior to commercialization of pulmonary delivery and advanced PEGylation products, we receive revenues from our partners for partial or full funding of research and development activities and progress payments upon achievement of certain developmental milestones. We believe this partnering strategy enables us to develop a large and diversified potential product portfolio.



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Utilize Our Technologies to Develop Proprietary Products with a Goal of Partnering with Pharmaceutical and Biotechnology Companies.    In addition to our partner-funded programs, we are applying our technologies independently through our internal early-stage proprietary product development efforts. We believe that there may be several off-patent or near-term patent expiration compounds that would benefit from the application of our technologies to improve such compounds' performance and delivery. For these programs, we are performing and funding the initial feasibility screening work, formulations development and early stage clinical trials before entering into a partner relationship for further development and commercialization. We believe that, when we partner these programs, we will be able to gain a greater share of such products' sales as a result of our undertaking greater product development efforts.

Nektar Technologies

NEKTAR ADVANCED PEGYLATION TECHNOLOGY

        Nektar Advanced PEGylation Technology is designed to enhance the efficacy and performance of most drug classes including macromolecules such as peptides and proteins along with small molecules and other drugs. PEGylation is a method for improving drug formulations through the modification of proteins and other molecular compounds accomplished through the attachment of PEG chains to the active therapeutic molecule. The chemical attachment of PEG chains to a broad range of drug substances results in effectively increasing the drug's molecular weight. The advantages of PEGylation include the potential to improve drug solubility and stability, reduce immune responses, and in certain instances, improve the efficacy and/or safety of a molecule.

        PEG is a neutral, water soluble, non-toxic polymer that is one of the few synthetic polymers approved for internal use by the FDA in a variety of foods, cosmetics, personal care products and pharmaceuticals. When dissolved in water, the long chain-like PEG molecule is heavily "hydrated" (meaning water molecules are bound to it) and is put in a state of rapid motion. This rapid motion leads to the PEG molecule preventing the approach of other molecules. Although PEG is largely invisible to biological systems, due to its unique properties it can improve stability and solubility of the drug compound, reduce the natural immune response to proteins and degradation by other enzymes, and increase concentration and circulation of the active drug compound throughout the system. As a

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result, the effectiveness of the active drug compound may be increased and the dosing frequency of the drug may be decreased.

        First generation PEG chemistry has been generally restricted to the use of PEG chains with low molecular weight because of the poor solubility characteristics traditionally observed with PEG chains of higher molecular weight. The attachment of low molecular weight PEG chains to proteins has been limited by the inherently unstable linkages of PEG chains to the molecular compound. Attachment of low molecular weight PEG chains can cause the modified compound to quickly degrade in a manner which may trigger an immune response to the active drug compound or otherwise hinder its effectiveness. The effectiveness of such PEG derivatives has also been limited by the ability of the relatively small PEG chains to penetrate poorly accessible regions on the surface of a protein resulting in degradation of the active drug compound or undesired side effects.

Characteristics of our Advanced PEGylation Technology

        Our Advanced PEGylation Technology is designed to overcome the shortcomings of first generation PEG chemistry. The attachment of our activated PEG derivatives is designed to yield one or more of the following benefits:

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Improved solubility and stability of the active drug compound;



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Reduced immunogenicity and degradation of the drug compound;



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Slower clearance from the body; and



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Improved efficacy and/or safety.

        As a result of these benefits, less frequent dosing may be possible due to increased circulation time, more of the administered dose may be available to reach its intended target, and the efficacy of a particular dose may be improved due to increased concentration of the drug and longer dwell time at the site of action by the active drug compound.

        Our Advanced PEGylation Technology is also designed to optimize the efficacy of the attached drug compounds and is characterized by the following features:

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Activated high-molecular weight PEGs chains that can be linked stably and site specifically to drugs, allowing prolonged performance of the drug in its PEGylated form;



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Stable linkage chemistry of the PEG chain to the drug compound to avoid problems associated with rapid degradation or clearance of the active drug compound;



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The availability of site-specific PEGylation in which the PEG chain is linked with the drug compound at a specific site on the compound to produce desired effects;



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Controlled release of the drug from the PEG-drug conjugated compound; and



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The availability of bi-functional PEG to facilitate targeting of the active drug compound.

Advanced PEGylation Technology Applications

        We believe our Advanced PEGylation Technology can be of critical importance in facilitating a substantial number of emerging biopharmaceutical technologies, including the following:

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PEG-Proteins for Pharmaceutical Use.    Our principal market strategy for our Advanced PEGylation technology is to demonstrate and assist in developing drug compounds, particularly proteins that substantially enhance the therapeutic value of the active drug over unmodified forms. It has been demonstrated the proteins with PEG chains attached can remain active and reduce immune response, if applicable. In addition, active drugs attached to PEG chains result

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in making proteins or other compounds much larger and thus reduces their rate of clearance through the kidney. This allows the active drug to remain active in the body for longer periods of time.

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PEG-Surfaces.    In addition to the modifications of drugs, PEG chains can also be attached to surfaces to form protective, biocompatible coatings. Potential applications include PEG-coatings for arterial replacements, diagnostic apparatuses, and blood contacting devices. Similarly, capillary zone electrophoresis has emerged as an analytical technique in biochemistry, and PEG coatings on capillaries have been demonstrated to prevent absorption and provide critical control of electro-osmosis.



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PEG-Hydrogels.    Hydrogels are highly biocompatible materials that can be used as drug delivery systems, medical devices, or surgical materials. PEG Hydrogels, which are matrices of polyethylene molecules, can reduce the frequency of dosing by allowing a drug to release slowly from the hyrdogel. In addition, PEG hydrogels can be used as medical devices to protect the applied area from adhesions or exposure.



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PEG-Liposomes.    Research has shown that incorporation of PEG onto the outer coating of liposomes, a type of lipid membrane, can provide controlled and specific delivery of certain drugs, by increasing serum lifetime.



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Molecule-Molecule and Molecule-Surface Coupling.    The nature of PEGs and their well-defined chemistry make them attractive for coupling or tethering molecules to molecules or molecules to surfaces. We believe this attribute could be critical to the next generation of drugs and biomaterials as developers seek to take advantage of unique properties resulting from binding particular molecules to other molecules or surfaces.



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Solubilization of Insoluble Materials.    PEG is soluble in both water and many organic solvents. Through PEG attachment water-insoluble materials may become water-soluble. PEG may be critical to the effectiveness of certain pharmaceuticals as without modification, such pharmaceuticals may not be effective at all.

        As with our other technologies, we typically develop new products using our Advanced PEGylation Technology through collaborations with corporate partners. We also maintain a catalog of PEG reagents which can be purchased by our customers for coupling to drug compounds. More typically, however, our research personnel will work closely with our partners to choose the proper PEG derivative for a particular application and to optimize the PEG attachment. In a typical collaboration, we derive revenue from milestone payments during research and development and receive royalties on sales of approved products or other PEG applications. In a typical collaboration, we also receive additional revenue from manufacturing the PEG reagent.

        We have also initiated internal development of a few proprietary drugs utilizing our Advanced PEGylation Technology with the expectation that we will fund this activity through the early stages of clinical trials before establishing a partnership to market the final product. We believe that, in certain circumstances, this may result in higher royalty payments for marketed products than collaborations initiated at earlier stages of development.

        Although five U.S. products and one additional European product using our Nektar Advanced PEGylation Technology are approved for use, there can be no assurance that Nektar Advanced PEGylation Technology will develop into a successful or commercially viable technology.

NEKTAR PULMONARY TECHNOLOGY

        We believe Nektar Pulmonary Technology can potentially enable the efficient and reproducible deep lung delivery of particles and greater lung deposition in a single breath. Specifically, our

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development of spray-dried formulations of fine, aerodynamic drug particles potentially enables efficient dispersibility and reproducible delivery of both large and small molecules to the deep lung for systemic and local lung indications.

        Nektar Pulmonary Technology integrates several technologies including customized formulation of drug compounds, dry powder processing, filling and packaging along with proprietary inhalation devices to enable efficient and consistent delivery of both macromolecule and small molecule drugs for systemic and local lung diseases. For specific drug products, we normally formulate and process bulk active pharmaceutical ingredients supplied by collaborative partners into dry powders, which are packaged into individual dosing units.

        Dry Powder Formulations for Pulmonary Delivery.    Each drug poses different formulation challenges due to differing chemical and physical characteristics and dosing requirements. This requires significant optimization work for each specific drug. We have assembled a team with expertise in formulation, life science, powder science and aerosol science, and we are applying this expertise to develop proprietary techniques and methods that we believe will produce stable, fillable, shippable and dispersible dry powder drug formulations. In the area of macromolecules, we have developed several protein powders, which remain stable at room temperature in excess of one year. Through our work with numerous macromolecules, we are developing an extensive body of knowledge on aerosol dry powder formulations, including knowledge relating to the physiochemical properties of particles that make up powders and the resulting characteristics such as flowability, dispersibility and solubility within the lung, as well as the related properties and influences of various excipients. We have filed and expect to continue to file patent applications on several of our formulations and, through strategic acquisitions, have acquired rights to certain U.S. and foreign patents and patent applications relating to stabilization of macromolecule drugs in dry powder formulations.

        Powder Processing.    We are modifying standard powder processing equipment and developing custom techniques to enable us to produce fine dry powders with particle aerosol diameters of between one and five microns without significant drug degradation or significant loss. We have scaled up powder processing to levels sufficient for producing candidate powders for late stage clinical trials. It is expected that production at these levels will be more than sufficient to satisfy the needs of small volume commercial products. We are also in the process of further scaling up our powder processing systems in order to produce quantities sufficient for commercial production of products we believe we will need to supply in high volumes, such as inhaleable insulin.

        Powder Filling And Packaging.    Powders made up of fine particles intended for inhalation typically require handling that is technically more challenging than for powders comprised of larger particles. Common practice in the pharmaceutical industry is to increase the powder's effective particle size by various agglomerative techniques such as pelletization, spheronization, or blending with an excipient of significantly larger particle size, in order to yield materials that handle more favorably in existing processing equipment such as tablet presses and capsule fillers. Thus, currently available commercial filling and packaging systems are generally designed for filling powders of larger particle size and mass, and are most commonly applied to oral dosage forms. Although applications of these capsule-filling approaches to aerosol products do exist, they typically can only deliver accurate and precise fills for much higher dose masses than required for deep lung delivery. Further still, by their method of operation they may overcompress or even damage the morphology of fine, low density powders, and may make them much more difficult to disperse than when in their uncompressed state. We have developed and internally qualified a proprietary automated blister and capsule filling systems suitable for use in production of clinical trial supplies and, for certain products, commercial quantities. The system has been tested across a wide variety of powders encountered to date and its performance yields accurate and precise fills across a wide range of dose masses, down to the order of a single milligram.

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The underlying technology is intended to allow its application to a broad variety of powder types, characteristics, and a wide range of target fill masses.

        Nektar Proprietary Pulmonary Inhaler.    Our proprietary pulmonary inhaler device is being designed to achieve the following:

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Effectively Disperse Fine Particles into an Aerosol Cloud.    Fine powders have different dispersion requirements or characteristics than large powders. Most current dry powder inhalers use larger powders and are not efficient in dispersing powders with aerosol diameters of one to five microns. We have developed and are refining the dispersion system for our pulmonary inhaler specifically for fine powders. Our inhaler has been designed to efficiently remove powders from the packaging, effectively disperse the powder particles and create an aerosol cloud while maintaining the integrity of the drug.



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Efficiently and Reproducibly Deliver the Aerosol Cloud to the Deep Lung.    We have developed and are refining a proprietary aerosol cloud handling system in our inhaler that is intended to facilitate deep lung powder deposition and reproducible patient dosing. The handling system design is intended to enable the aerosolized particles to be transported from the inhaler to the deep lung during a patient's breath, reducing losses in the throat and upper airways. In addition, the aerosol cloud handling system, in conjunction with the dispersion mechanism and materials used in the inhaler, has been designed to reduce powder loss in the inhaler itself.

Nektar Small Dry Powder Inhaler ("DPI")

        We are developing a breath actuated compact dry powder inhaler device. It is being developed to be appropriate for the delivery of either large or small molecules for short-term use.

Nektar Metered Dose Inhaler ("MDI")

        We are also working to develop drugs for use in MDIs. We believe our expertise in pulmonary drug formulations and inhalers allows for stable formulations with new hydrofluoroalkane propellants and the delivery of many molecules more efficiently to the deep lung compared with traditional MDIs.

        To date there are no products using Nektar Pulmonary Technology that have been approved for use and there can be no assurance that our Nektar Pulmonary Technology will be a successful or commercially viable technology or will work for any or all of its intended uses. Specifically, there can be no assurance that we will be successful in further scaling up our powder processing, powder filling, packaging operations, or device manufacturing operations on a timely basis or at a reasonable cost, or that our powder processing, powder filling, packaging, or inhaler device will be applicable for every drug.

NEKTAR SUPERCRITICAL FLUID TECHNOLOGY

        A majority of pharmaceutical products contain powder particles, either in the final form or at some point during the manufacturing process. It is generally believed that specific particle characteristics are fundamental to the effectiveness of drug delivery but precision and consistency in particle formation are difficult to achieve using conventional multi-stage methods of production.

        Our SCF Technology uses substances such as carbon dioxide at elevated temperatures and pressures as non-solvents to control the formation of powder particles for a wide variety of chemical substances. This technique is designed to reduce to a single step the current multi-stage powder manufacturing process for drug powders, while at the same time possibly improving product purity and consistency. It offers an alternative to typical crystallization processes for many small molecules with the potential benefits of better control over particle size, form, structure and surface characteristics resulting in the potential for improved drug absorption, easier and more efficient formulation of drug

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compounds and lower manufacturing costs. We believe this technology may also be useful in connection with technologies designed for taste masking.

        In our SCF Technology process, the supercritical fluid disperses and mixes a stream of drug solution while simultaneously extracting the organic solvent and rapidly forming dry particles. This is achieved by metering the solution and the supercritical fluid into a particle formation vessel held under controlled conditions of temperature and pressure above the critical point of the supercritical fluid-solvent mixture. Dry and solvent free particles are then recovered from the particle formation vessel.

        As a single-stage manufacturing process, we believe our SCF Technology may provide greater control over batch-to-batch consistency, particle size, particle shape, powder flow, dissolution rate and residual solvent levels than traditional manufacturing methods.

        We believe our SCF Technology can serve as a platform technology for a diverse range of therapeutic areas, including the following:

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Solid State Selection.    The process is designed to offer the ability to prepare selected solid state forms (including selected polymorphic forms) in a manner that is easily reproducible.



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Water Solubility.    The process is designed to help provide enhanced dissolution of sparingly water-soluble drugs, by producing sub-micron sized particles and/or particles with high surface areas and/or through co-formulation with water-soluble polymers.



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Taste Masking.    We believe that our SCF Technology can be used to mask the taste of many oral drugs, particularly small organic molecules.

        To date there are no products using our SCF technology that have been approved for use and all of our collaborations utilizing this technology are in very early stages of development. There can be no assurance that our SCF Technology will be a successful or commercially viable technology.

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Nektar Product Pipeline and Partner Development Programs

        The following table summarizes our partner development programs for products approved for use or in clinical trials, including the indication for the particular drug or product, its present stage of clinical development or approval in the United States unless otherwise noted, and, with respect to our announced partner development programs, the identity of the corporate partner for such program.

(1)

Status means:

Approved—regulatory approval to market and sell product obtained.

Phase III—large-scale clinical trials conducted to obtain regulatory approval to market and sell a drug; initiated following encouraging Phase II trial results.

Phase II—clinical trials to establish dosing and efficacy in patients.

Phase I—clinical trials typically in healthy subjects to test safety. (Phase I trials for inhaled tobramycin and inhaled leuprolide were conducted by us prior to our collaborations with Chiron and Enzon, respectively. Chiron is currently conducting a Phase I trial with inhaled tobramycin, and Enzon may conduct a Phase I trial in the future with inhaled leuprolide).

Selected Partner Development Programs

FDA Approved Products

Neulasta® Program (PEG-G-CSF)

        We are a party to a license, manufacturing and supply agreement with Amgen Inc. originally executed in July 1995, to supply its proprietary 20kDa PEG derivative, which is utilized in the manufacture of pegfilgrastim for Amgen's Neulasta product. Neulasta was approved for marketing in the United States by the FDA in late January 2002.

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        Neulasta is indicated for decreasing the incidence of infection, as manifested by febrile neutropenia (fever associated with a severe drop in infection-fighting white blood cells) in patients with non-myeloid malignancies receiving myelosuppressive anti-cancer drugs. Febrile neutropenia is a serious and common complication of many cancer chemotherapies. Up to half of cancer chemotherapy patients develop severe neutropenia, potentially placing them at risk for life-threatening infections. Thousands of patients are hospitalized for neutropenia and its complications each year, in an age when most chemotherapy patients are treated in the outpatient setting.

PEGASYS® Program (PEG Interferon Alpha)

        We are a party to a license, manufacturing and supply agreement with F. Hoffmann-La Roche Ltd. originally executed in November 1998, whereby we licensed to Roche the PEG reagent used in Roche's Pegasys product for the treatment of chronic hepatitis C. We share a portion of the profits on this product with Enzon Pharmaceuticals, Inc. We are also a party to a subsequent agreement with Roche executed in April 1999, related to further collaborative work on Pegasys, a PEGylated interferon alpha-2a product.

Somavert® Program (PEG-hGHRa)

        We are a party to a license, manufacturing and supply agreement with Sensus Drug Development Corporation originally executed in April 2000, for the PEGylation of Somavert (pegvisomant for injection), a human growth hormone receptor antagonist. This agreement provides us with milestone payments, and manufacturing revenues related to the PEG reagent. In March 2001, Pharmacia Corp. acquired Sensus and in April 2003, Pfizer, Inc., acquired Pharmacia.

        Somavert has been approved for marketing in the U.S. and Europe for the treatment of certain patients with acromegaly. Patients with acromegaly often suffer from headache, excessive sweating, soft-tissue swelling, joint disorders and a progressive coarsening of facial features and enlargement of the hands, feet and jaw. In acromegaly, excess production of growth hormone is usually caused by a pituitary tumor, which is a condition affecting an estimated 40,000 patients in the U.S., Europe and Japan.

PEG-INTRON® Program (PEG Interferon Alpha)

        We are a party to a manufacturing agreement with Schering-Plough Corporation originally executed in February 2000 in connection with the PEG reagent used in PEG-INTRON (PEG-interferon alpha) for use in the treatment of the hepatitis C virus.

        Chronic hepatitis C is estimated to affect some 10 million people in the major world markets. The Centers for Disease Control and Prevention ("CDC") estimate that between 2.7 and 4 million people living in the United States are chronically infected with the hepatitis C virus with 70 percent of infected patients going on to develop chronic liver disease. Hepatitis C infection contributes to the deaths of an estimated 8,000 to 10,000 Americans each year and this toll is expected to triple by the year 2010, according to the CDC.

Definity® Program (PEG)

        We are a party to an agreement with Dupont Pharmaceuticals, now part of Bristol Myers-Squibb, originally executed in 1996. Bristol Myers-Squibb is using our Advanced PEGylation Technology in its Definity ultrasound system for diagnostically visualizing the heart.

        Definity is the first ultrasound contrast agent in the United States that is non-blood derived. It is comprised of gas-filled microspheres that are injected or infused into the body. When exposed to ultrasound waves, the microspheres resonate and echo strong signals back to the ultrasound machine.

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Non FDA Approved Products

Exubera® Inhaleable Insulin Program

        Insulin is a protein hormone naturally secreted by the pancreas to induce the removal of glucose from the blood into cells. Diabetes, the inability of the body to properly regulate blood glucose levels, is caused by insufficient production of insulin by the pancreas or resistance to the insulin produced. Over time, high blood glucose levels can lead to failure of the microvascular system, which may lead to blindness, loss of circulation, kidney failure, heart disease or stroke. Insulin, in its injectable form, is supplied by various manufacturers, including Eli Lilly and Company, Novo-Nordisk A/S and Aventis.

        According to the CDC, approximately 150 million people worldwide have diabetes, and the number is expected to rise to 300 million people within the next 20 years. All Type 1 diabetics, estimated at between 5% and 15% of all diabetics, require insulin therapy. Type 1 diabetics require both basal insulin in the form of long-acting insulin and multiple treatments of regular, or short acting, insulin throughout the day. Type 2 diabetics, depending on the severity of their disease, may or may not require insulin therapy. Because of the inconvenience and unpleasantness of injections, many Type 2 patients who do not require insulin to survive, despite the fact that they would benefit from it, are reluctant to start insulin treatment.

        Insulin therapy in Type 2 patients is generally given twice daily and is a combination of a short and long acting insulin. A ten-year study by the National Institutes of Health ("NIH"), however, demonstrated that the side effects of diabetes could be significantly reduced by dosing more frequently. The NIH study recommended dosing regular insulin three to four times per day, a regimen that would more closely mirror the action of naturally produced insulin in non-diabetics. Because of the risk of severe hypoglycemia, this course of treatment is not recommended for children, older adults, people with heart disease or with a history of frequent severe hypoglycemia. In addition, many patients are reluctant to increase their number of daily doses because they find injections unpleasant and inconvenient. Similar results were demonstrated in Type 2 patients in a UK trial.

        Per the terms of a collaborative agreement originally entered into in January 1995, we are developing with Pfizer an inhaleable version of regular human insulin (Exubera®) that can be typically administered in one to three blisters per dose using our Pulmonary Technology. We believe that our Pulmonary Technology delivery system could provide increased user convenience and result in greater patient compliance by eliminating some injections for Type 1 and Type 2 patients and all injections for some Type 2 patients. In addition, we believe that because inhaleable insulin has a more rapid onset of action than injectable insulin, it offers simpler pre-meal dosing than the slower acting regular insulin.

        Phase I and Phase IIa clinical trials indicated that inhaleable insulin was absorbed systemically, reduced blood glucose levels and provided the same control of diabetes as injected insulin. In October 1996, Pfizer initiated a multi-site Phase IIb outpatient trial to include up to 240 diabetes patients, the results of which were announced in June 1998. In 70 Type 1 diabetics treated with either inhaleable or conventional injected insulin therapy for three months, blood levels of hemoglobin A_lC, or ("HbA_lC"), the best index of blood glucose control, were statistically equivalent. Virtually identical results were obtained in a group of Type 2 diabetics. In September 1998, Pfizer released additional Phase II data from a study of diabetics whose blood glucose was poorly controlled by oral agents alone. In that study, patients who were given inhaleable insulin in addition to their oral medications showed marked improvement in their blood glucose control.

        In November 1998, Pfizer and Aventis announced that they entered into a worldwide agreement to manufacture insulin and to co-develop and co-promote inhaleable insulin. Under the terms of the agreement, Pfizer and Aventis have constructed a jointly owned insulin manufacturing plant in Frankfurt, Germany. If Exubera® is approved for use, we will continue to have responsibility for manufacturing at least 50% of the inhaleable insulin drug powders, and for supplying inhalers. In

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addition to receiving revenues for the manufacture and supply of drug powders and inhalers, we will receive a royalty on inhaleable insulin products marketed jointly by Pfizer and Aventis.

        In June 1999, Pfizer began dosing in Phase III clinical trials. In June 2000, Pfizer reported new data on patients using inhaleable insulin therapy from a Phase II continuation, or extension, study being conducted by Pfizer and Aventis. The goal of the extension study was to determine if safety and efficacy results from previously reported short-term Phase II clinical trials could be maintained in the long term. These data showed that HbA_lc, the long-term measurement of blood glucose control, remained stable in patients for up to 30 months of therapy. At the time that this data was compiled, 83 patients had completed 24 months of inhaleable insulin therapy. Further data presented indicated similar results for patients who completed 30 months of therapy.

        In June 2001, Pfizer reported on data released from Phase III studies showing that more Type 2 patients who were treated with inhaleable insulin achieved the recommended blood glucose levels than patients who received only insulin injections. In addition the frequency and nature of adverse events were comparable between groups. Patients who used inhaleable insulin developed increased insulin antibody serum binding, but there did not appear to be any related clinical significance. Additional data released from these Phase III studies suggested that Type 1 patients using inhaleable insulin multiple times a day with one bedtime long acting insulin injection achieved comparable control of blood glucose to that seen in patients receiving multiple daily insulin injections. An additional Phase III study indicated that Type 2 patients who were poorly controlled on a combination of two oral diabetes therapies demonstrated improved glycemic control and greater overall satisfaction and acceptance of therapy when inhaleable insulin was added to their treatment regimen or when it replaced oral therapies.

        In December 2001, Pfizer announced that it had decided to include an increased level of controlled, long-term safety data in its proposed New Drug Application ("NDA") to the FDA with respect to Exubera®. In May and June 2002, Pfizer and Aventis released data from Phase III studies conducted with Exubera®. The data showed that Type 2 patients who had failed to meet recommended blood glucose levels with combination oral therapy, achieved better glycemic control with Exubera® than patients who received oral agents. In addition, the study results showed that Exubera® provides glycemic control equal to insulin injections in Type 1 patients. However, the data also indicated a small relative decrease in one of the pulmonary function tests in the Exubera® treatment group. In October 2002, Pfizer and Aventis announced that they would complete additional long-term studies already underway for Exubera® to determine whether there is clinical significance to the pulmonary function data, and that they were continuing their discussions with regulatory agencies regarding the timing of an NDA submission for the product.

        In June 2003, Pfizer and Aventis released Phase III data suggesting that Exubera® may provide acceptable glycemic control to significantly more subjects than rosiglitazone in Type 2 diabetes patients not optimally controlled on diet and exercise. Rosiglitazone is an oral hypoglycemic agent used to reduce the body's resistance to the action of insulin as a way of lowering blood glucose.

        In March 2004, Pfizer and Aventis announced that the European Medicines Evaluation Agency ("EMEA") has accepted the filing of a marketing authorization application for Exubera®.

        There can be no assurance that the EMEA will approve Exubera® for marketing, or that Pfizer will file for approval to market Exubera® in the U.S. or any other market and, if such filing is made, there can be no assurance that Pfizer will obtain approval to market Exubera® in the U.S. or such other markets. The determination of when, if ever, to file for marketing approval in the U.S. or any other market will be made by Pfizer at its discretion. The failure to file for or obtain regulatory approval of Exubera® in the U.S. or such other markets would significantly harm our business. Any eventual label claims for Exubera® will be subject to regulatory approval of the product and its labeling.

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Macugen™ Program

        In February 2002, we announced a long-term commercial supply agreement with Eyetech Pharmaceuticals, Inc. Eyetech is currently conducting a Phase II/III pivotal clinical trial to evaluate the safety and efficacy of Macugen, a PEGylated anti-Vascular Endothelial Growth Factor aptamer, for the treatment of age-related macular degeneration ("AMD"), which is the leading cause of blindness among Americans over the age of 55.

        Macugen is also in Phase II testing for the treatment of diabetic macular edema ("DME"). The FDA has granted Macugen "fast-track" status for the treatment of exudative or "wet" form of AMD as well as for DME because of the product's expected potential to fulfill a significant unmet medical need.

        Under the agreement, we will provide Eyetech with our Advanced PEGylation Technology for use in the development of Macugen and we will receive milestone payments, royalties on sales of commercialized products and revenues from exclusive manufacturing of the PEG derivative. We will share a portion of the profits on this product with Enzon Pharmaceuticals, Inc. when and if the product is commercially launched.

        In November 2003, Eyetech presented data from Phase III trials of Macugen for AMD. As a result of this data, Eyetech stated that it and Pfizer plan to file an NDA in the second half of 2004 for Macugen, a product that has received fast-track status from the FDA due to an unmet medical need.

PEG CDP 870 Program

        We are a party to a license, manufacturing and supply agreement for PEG CDP 870 with Celltech Group plc executed in 2000, which was subsequently assigned to Pharmacia for the rheumatoid arthritis indication. In October 2002, Pharmacia initiated Phase III clinical trials with CDP 870. In April 2003, Pfizer acquired Pharmacia and in December 2003, Pfizer announced that it would reassign rights to CDP870 back to Celltech during early 2004.

        Rheumatoid arthritis affects an estimated 2.1 million Americans. This systemic autoimmune disease is characterized by inflammation of the lining of the joint. Current therapies are directed at treating the symptoms of rheumatoid arthritis or at modifying the disease, or a combination of the two, requiring daily or weekly administration.

        Under the agreement, we receive milestone payments, royalties on product sales and PEG manufacturing revenues if the product is commercialized, which will be partially shared with Enzon Pharmaceuticals, Inc.

        Celltech is also assessing CDP 870 in Phase III studies as a treatment for Crohn's disease, a chronic digestive disorder of the intestines, sometimes referred to as inflammatory bowel disease. In the U.S. approximately 500,000 people have Crohn's disease, and the growth rate is estimated at 3-4% annually.

SprayGel™ Program (PEG-hydrogel)

        We are a party to a license, supply and manufacturing agreement with Confluent Surgical, Inc. originally executed in August 1999, for use of our PEG-hydrogel in Confluent's SprayGel adhesion barrier system. Under the terms of this arrangement, we manufacture and supply PEG components used in the SprayGel system and receive royalty payments on sales of commercialized products, and manufacturing and supply revenues from Confluent. SprayGel was approved for commercial distribution in Europe, receiving product certification by European regulatory authorities in November 2001. In June 2002, Confluent initiated Phase II/III pivotal trials in the U.S. of SprayGel.

        SprayGel is a biodegradable, water-based, coating material designed to prevent postoperative adhesions formation. Adhesions can be responsible for severe pain and discomfort as well as small

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bowel obstructions and are the leading cause of infertility in women following gynecological surgery. Approximately 500,000 surgical procedures are performed annually to remove adhesions.

CERA (Continuous Erythropoiesis Receptor Activator)

        In February 2004, we announced a collaboration with Roche under which we licensed a proprietary PEG (PEGylation) reagent used in the manufacture of Roche's product CERA (Continuous Erythropoiesis Receptor Activator). Under the terms of the collaboration, we will receive milestone and manufacturing revenues during development and will receive royalty and manufacturing revenues following commercialization of the product.

PEG CDP 860, CDP 791, and CDP 484 Programs

        In October 2002, we announced a licensing, manufacturing and supply agreement for three products with Celltech Group, plc, including CDP 860, a PEGylated antibody fragment drug in Phase II clinical testing for the treatment of cancer tumors. In June 2003, Celltech announced the completion of a small Phase II proof-of-concept study for CDP 860. According to Celltech, the effects observed in this study were consistent with the proposed mechanism of action and confirmed the biological activity of this molecule.

        We are also currently collaborating on PEGylated antibody fragment products CDP 791 and CDP 484 for cancer and rheumatoid arthritis respectively with Celltech. Celltech announced the initiation of a Phase I trial for CDP 791.

        Under the terms of the agreement, we will provide exclusive development and manufacturing for each activated PEG for all three products. In exchange, we will receive milestone payments, manufacturing revenues and royalties on sales of commercialized products. We will share a portion of the profits on this product with Enzon Pharmaceuticals, Inc. when and if the product is commercially launched.

Inhaled Tobramycin Program

        In December 2001, we entered into a collaboration with Chiron Corporation to develop a next-generation inhaleable formulation of tobramycin for the treatment of pseudomonas aeruginosa in cystic fibrosis patients and to explore the development of other inhaled antibiotics using our Advanced Pulmonary Technology. Chiron's existing tobramycin product, TOBI, was introduced in 1998 as the first inhaled antibiotic approved for treating pseudomonas aeruginosa lung infections in cystic fibrosis patients. In July 2003, Chiron initiated a Phase I trial for inhaled tobramycin. Prior to collaborating with Chiron, we had previously conducted a proof-of-concept Phase I trial in healthy subjects of inhaled powder tobramycin.

        Under the terms of the tobramycin collaboration, we will be responsible for the development of the next generation formulation of inhaleable tobramycin as well as clinical and commercial manufacturing of the drug formulation and delivery device. Chiron will be responsible for the clinical development and worldwide commercialization of the drug formulation and delivery device combination. We will receive research and development funding, milestone payments as the program progresses through further clinical testing, and royalty payments and manufacturing revenues once the product is commercialized.

        Cystic fibrosis is a hereditary disease that primarily affects people of Caucasian origin. About 30,000 people in the United States and about 70,000 people worldwide have cystic fibrosis. Patients with cystic fibrosis typically suffer from chronic respiratory infections, digestive disorders, reduced male fertility and other problems.

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Inhaled Leuprolide Program

        In January 2002, we announced a strategic alliance with Enzon Pharmaceuticals, Inc. that includes an agreement making us solely responsible for licensing Enzon's PEGylation patents, an option for Enzon to license our PEGylation patents, an agreement to explore the development of non-invasive delivery of single-chain antibody products via the pulmonary route and settlement of a patent infringement litigation originally initiated by Enzon. We will have the option to license Enzon's PEGylation patents for use in our proprietary products. Enzon will receive a royalty or a share of profits on final product sales of any products that use Enzon's patented PEG technology, including branched PEG. As part of this broad alliance, we entered into a collaboration to develop three products using our Pulmonary Technology and/or SCF Technology. The first potential product under this collaboration may be an inhaleable formulation of leuprolide acetate to treat endometriosis. Under the terms of this collaboration, we will be responsible for the development of drug formulations for the agreed upon pharmaceutical agents as well as clinical and commercial manufacturing of the drug formulation and delivery device. Enzon will be responsible for the clinical development and worldwide commercialization of the drug formulation and delivery device combination. We may receive research and development funding and milestone payments as the program progresses through further clinical testing, and will receive royalty payments if the product is commercialized. As part of this alliance, Enzon made a $40.0 million equity investment in our convertible preferred stock.

Marinol® Program

        In February 2002, we entered into a collaboration with Unimed Pharmaceuticals, Inc., a wholly owned subsidiary of Solvay Pharmaceuticals, Inc., to develop an MDI formulation of dronabinol (synthetic delta-9-tetrahydrocannabinol) to be used for multiple indications. Dronabinol is the active ingredient in Unimed's MARINOL capsules. MARINOL capsules are approved in the U.S. for the treatment of anorexia associated with weight loss in patients with AIDS and for the treatment of refractory nausea and vomiting associated with cancer chemotherapy. In the second quarter of 2003, Unimed initiated a Phase I trial.

        Under the terms of the collaboration, we will be responsible for development of the formulation, as well as clinical and commercial manufacturing of the drug formulation delivery and device. Solvay will be responsible for the clinical development and worldwide commercialization of the drug formulation and delivery device combination. We will receive research and development funding, milestone payments as the program progresses through further clinical testing, and royalty payments on product sales and manufacturing revenues if the product is commercialized.

Dental Regeneration Products

        In January 2003, we announced an agreement with the Straumann Group to license, manufacture and supply Nektar's PEG-based hydrogel technology for dental regeneration products. The proposed PEG-based hydrogel product will be designed for use by dentists to support tissue regeneration in dental surgery.

        Under the agreement, Straumann will license and source our PEG-based hydrogel technology and material exclusively for a proprietary formulation. We will receive milestone and manufacturing payments as well as royalties on commercialized products.

Supplemental Agreement with Alliance Pharmaceutical Corp.

        In March 2002, we announced the expansion of our agreement with Alliance Pharmaceutical Corp. ("Alliance") regarding the PulmoSphere® particle and particle processing technology, aspects of which we initially acquired from Alliance in November 1999. The PulmoSphere technology is a particle engineering method designed to enhance the performance of drugs delivered via the lung in propellant-

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based metered-dose inhalers and dry powder inhalers. As a result of the supplemental agreement, we paid Alliance $5.25 million in exchange for rights beyond inhaleable applications and other considerations. Under the terms of the supplemental agreement, we have the right to use the PulmoSphere technology for alternative methods of delivery in addition to inhaleable applications. Further, Alliance assigned five new patent applications covering methods of producing microparticles to us. Alliance retains the rights to use the technology on products to be instilled directly into the lung, and obtains the rights to commercialize up to four products administered with inhalers, two of which will be royalty-free. We will pay Alliance future milestones and royalty payments on a reduced number of products developed by us or our licensees utilizing the technology.

Feasibility Studies

        In addition to the partner collaborations mentioned above and other development programs, we have conducted and continue to conduct feasibility studies of additional drug formulations both on our own account and in cooperation with potential collaboration partners. We will continue to pursue these and other feasibility programs to determine the potential for collaborative development programs with respect to these drugs. There can be no assurance that any of our feasibility studies will be successful or result in collaborative development programs.

Collaborations Terminated in 2003

Alpha-1 Proteinase Inhibitor Program

        In January 1997, we entered into a collaborative agreement with Centeon (later, Aventis-Behring) to develop a pulmonary formulation of alpha-1 proteinase inhibitor to treat patients with alpha-1 antitrypsin deficiency, or genetic emphysema. In January 2004, this agreement was terminated. We retained the rights to continue development and intend to seek another partner for further development of inhaleable alpha 1 proteinase inhibitor.

PA 2794 Inhaleable Antibiotic Program

        In July 2002, we announced a collaboration with Chiron Corporation to develop an antibiotic product using our Pulmonary Technology. Based on feasibility work completed by us, the product developed under this collaboration was to be an inhaleable powder version of PA 2794, a proprietary Chiron antibiotic from a class commonly used to treat pulmonary infections. In November 2003, we announced that at the request of Chiron, for strategic marketing reasons, we discontinued development of this product.

Research and Development

        Our research and development activities can be divided into research and preclinical programs, clinical development programs and commercial readiness. Our costs associated with research and preclinical programs, clinical development programs and commercial readiness over the past three years approximate the following (in thousands):

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Manufacturing

        Our goal in manufacturing is to achieve the following:

•

Provide economies of scale by utilizing manufacturing capacity for multiple products;



•

Improve our ability to retain any manufacturing know-how; and



•

Allow our customers to bring products to market faster.

        With respect to products based on our Pulmonary Technology, we generally plan to formulate, manufacture and package the powders for our pulmonary delivery products and to subcontract the manufacture of our proprietary pulmonary delivery devices. Our device for use with Exubera®, the pulmonary inhaler, is still in clinical testing and production scale-up work is ongoing. Further work is underway to enable large-scale commercial manufacturing and additional work may be required to optimize the device for regulatory approval, field reliability or other issues that may be important to its commercial success. Additional design and development work may lead to a delay in regulatory approval. Under our collaborative agreement with Pfizer to develop Exubera®, we will manufacture inhaleable insulin powders and Pfizer will be primarily responsible for filling and packaging blisters. The terms of the supply agreement with Pfizer provide that prior to the commercialization of Exubera®, we must build and have validated a powder processing facility and a device manufacturer or manufacturers. We will be the commercial powder manufacturer at launch, if any. Pfizer has the right to manufacture a portion of the powder requirement post-launch.

        We have built a powder manufacturing and packaging facility in San Carlos, California capable of producing powders in quantities we believe are sufficient for clinical trials of products based on our Pulmonary Technology. This facility has been inspected and licensed by the State of California and is used to manufacture and package powders under current FDA Good Manufacturing Practices. We have completed construction of a commercial facility to meet initial anticipated commercial manufacturing commitments. We believe that scale-up and validation will be completed in time for commercial operations should a product using our Pulmonary Technology be approved for use.

        We are working to scale-up our powder processing to a larger production scale system and to further develop the necessary powder packaging technologies. Fine particle powders and small quantity packaging (such as those to be used in our Pulmonary Technology) require special handling. Current commercial packaging systems are designed for filling larger quantities of larger particle powders and therefore must be modified to dispense finer particles in the small quantities we require for our Pulmonary Technology.

        We have developed a high capacity automated filling unit capable of filling blisters on a production scale for moderate and large volume products using our Pulmonary Technology. The technology has been transferred to Pfizer who will have the responsibility of commercial packaging and filling the bulk drug powders for Exubera®.

        One of our proprietary pulmonary inhaler devices is being developed for commercial use and is being used in the Phase III Exubera® and other trials. In March 2004, Pfizer and Aventis announced that the European Medicines Evaluation Agency (EMEA) has accepted the filing of a marketing authorization application for Exubera®. We have identified and have established formal supply agreements with contract manufacturers that we believe have the technical capabilities and production capacity to manufacture our pulmonary inhaler device. It is believed that these contract manufacturers can successfully receive the device technology and know-how transferred from our device development group, scale up the manufacturing process, and meet the requirements of current FDA Good Manufacturing Practices. The contract manufacturers have completed construction of their facilities. Manufacturing scale-up and qualification efforts are underway. We are examining scale-up and validation plans to support their commercial operations.

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        We are also developing a breath actuated compact dry powder inhaler device. It is being developed to be appropriate for the delivery of either large or small molecules for short-term use.

        With respect to products using Nektar Advanced PEGylation Technology, we have one facility in Huntsville, Alabama for the manufacture of PEG-derivatives. We are currently increasing capacity to handle current and future demand based on our current pipeline.

        With respect to products using our Nektar SCF Technology, we currently have one facility in Bradford, England for the production of dry powder material meeting the requirements of current MHRA Good Manufacturing Practices.

        There can be no assurance that we will be able to process successful drug powders, or manufacture products on our autofiller system in a timely manner or at commercially reasonable cost. Any failure or delay in further developing this technology would delay product development or inhibit commercialization of our products and would have a material adverse effect on us. There can be no assurance that we will be able to successfully transfer our filling and packaging technology to Pfizer for the commercial manufacture of the Exubera® product, if approved. Moreover, there can be no assurance that we will be able to scale-up and validate our contract manufacturers successfully, or that we will be able to maintain satisfactory contract manufacturing on commercially acceptable terms. Our dependence upon third parties for the manufacture of our pulmonary inhaler device and its supply chain may adversely affect our cost of goods, our ability to develop and commercialize products on a timely and competitive basis, and the production volume of pulmonary inhaler devices.

Government Regulation

        The research and development, clinical testing, manufacture and marketing of products using our technologies are subject to regulation by the FDA and by comparable regulatory agencies in other countries. These national agencies and other federal, state and local entities regulate, among other things, research and development activities and the testing (in vitro and in animals and in human clinical trials), manufacture, safety, effectiveness, labeling, storage, record keeping, approval, advertising and promotion of our products.

        The process required by the FDA before a product using our technologies may be marketed in the United States depends on whether the compound has existing approval for use in other dosage forms. If the drug is a new chemical entity that has not been previously approved, the process includes the following:

•

Extensive preclinical laboratory and animal testing;



•

Submission of an Investigational New Drug application, or IND;



•

Adequate and well-controlled human clinical trials to establish the safety and efficacy of the drug for the intended indication; and



•

Submission to the FDA for approval of an NDA, for drugs or a Biological License Application, or BLA, for biological products.

        If the drug has been previously approved, the approval process is similar, except that certain preclinical tests relating to systemic toxicity normally required for the IND and NDA/BLA application may not be necessary.

        Preclinical tests include laboratory evaluation of product chemistry and animal studies to assess the potential safety and efficacy of the product and its chosen formulation. Preclinical safety tests must be conducted by laboratories that comply with FDA Good Laboratory Practices regulations. The results of the preclinical tests are submitted to the FDA as part of the IND application and are reviewed by the

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FDA before clinical trials can begin. Clinical trials may begin 30 days after receipt of the IND by the FDA, unless the FDA raises objections or requires clarification within that period.

        Clinical trials involve the administration of the drug to healthy volunteers or patients under the supervision of a qualified, identified medical investigator according to an approved protocol. Drug products to be used in clinical trials must be formulated according to current Good Manufacturing Practices. Clinical trials are conducted in accordance with protocols that detail the objectives of the study, the parameters to be used to monitor participant safety and efficacy or other criteria to be evaluated. Each protocol is submitted to the FDA as part of the original IND. Each clinical study is conducted after written approval is obtained from an independent Institutional Review Board, or IRB. The IRB considers, among other things, ethical factors, the potential risks to subjects participating in the trial and the possible liability to the institution where the trial(s) is/are being conducted. The IRB also approves the consent form signed by the trial participants.

        Clinical trials are typically conducted in three sequential phases. In Phase I, the initial introduction of the drug into healthy human subjects, the product generally is tested for tolerability, pharmacokinetics, absorption, metabolism and excretion. Phase II involves studies in a limited patient population to:

•

Determine the efficacy of the product for specific targeted indications;



•

Determine dosage tolerance and optimal dosage and regimen of administration; and



•

Identify possible adverse effects and safety risks.

        After Phase II trials demonstrate that a product is effective and has an acceptable safety profile, Phase III trials are undertaken to evaluate the further clinical efficacy and safety of the drug/formulation within an expanded patient population at geographically dispersed clinical study sites, and in large enough trials to provide statistical proof of efficacy/tolerability. The FDA, the clinical trial sponsor, the investigators or the IRB may suspend clinical trials at any time if any one of them believes that study participants are being subjected to an unacceptable health risk.

        The results of product development, preclinical studies and clinical studies are submitted to the FDA as an NDA/BLA for approval of the marketing and commercial shipment of the drug product. The FDA may deny an NDA/BLA if applicable regulatory criteria are not satisfied or may require additional clinical and/or pharmaceutical testing or requirements. Even if such data are submitted, the FDA may ultimately decide that the NDA/ BLA does not satisfy all of the criteria for approval (e.g. consistency of manufacture of the drug/formulation). Product approvals, once obtained, may be withdrawn if compliance with regulatory standards are not maintained or if safety concerns arise after the product reaches the market. The FDA may require additional post-marketing clinical testing and pharmacovigilance programs to monitor the effect of drug products that have been commercialized and has the power to prevent or limit future marketing of the product based on the results of such programs.

        Each domestic drug product-manufacturing establishment must be registered with, and approved by, the FDA. Establishments handling controlled substances must in addition, be licensed by the United States Drug Enforcement Administration. Domestic manufacturing establishments are subject to biennial inspections by the FDA for compliance with current Good Manufacturing Practices. Facilities and drug products manufactured in the UK are also subject to UK regulatory review. They are also subject to U.S., and U.K. federal, state and local regulations regarding workplace safety, environmental protection and hazardous and controlled substance controls, among others.

        Many of the drugs we are developing are already approved for marketing by the FDA in another form and delivered by another route. We believe that when working with approved drugs, the approval process for products using our alternative drug delivery or formulation technologies may require less

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time and fewer tests than for new chemical entities. However, we expect that our formulations for use with any of our technologies may use excipients not currently approved for use (e.g., pulmonary delivery). Use of these excipients will require additional toxicological testing that may increase the costs of or length of time to gain regulatory approval. In addition, regulatory procedures as they relate to our products may change as regulators gain experience, and any such changes may delay or increase the cost of regulatory approvals.

        For products currently under development based on our Pulmonary Technology, our pulmonary inhaler devices are considered to be part of a drug/device combination for deep lung delivery of each specific molecule. Prior to submission of an IND, the FDA will make a determination as to the most appropriate Center and Division within the FDA that will assume prime responsibility for the review of the IND and NDA/BLA. In the case of our products, either the Center for Drug Evaluation and Research or the Center for Biologics Evaluation and Research, in consultation with the Center for Devices and Radiological Health, could be involved in the review. The assessment of jurisdiction within the FDA is based upon the primary mode of action of the drug or the location of the specific expertise in one of the Centers as identified in the FDA's inter Center agreement.

        To date, our partners have generally been responsible for clinical and regulatory approval procedures, but we may participate in this process by submitting to the FDA a drug master file developed and maintained by us which contains data concerning the manufacturing processes for the inhaler device or drug product. Through our internal proprietary products development efforts, we have prepared and submitted an IND application and intend to use the IND process to enable us to conduct preliminary clinical studies before licensing certain products to corporate partners. The clinical and manufacturing development and regulatory review and approval process generally takes a number of years and requires the expenditure of substantial resources. Our ability to manufacture and sell products, whether developed initially by us or under collaboration agreements, ultimately depends upon the partners' completion of satisfactory clinical trials and success in obtaining marketing approvals from the FDA and equivalent foreign Health Authorities.

        Sales of our products outside the United States are subject to local regulatory requirements governing clinical trials and marketing approvals for drugs. Such requirements vary widely from country to country.

        In developing the device component for our Pulmonary Technology, we have sought to develop our quality systems and design engineering function in adherence to the principles of design control for medical devices as set forth in the applicable regulatory guidance. Although hybrid drug/device products are typically reviewed as a drug, we have sought to adhere to the design control approach both as a good business practice, and because it appears that the drug and biologic centers of the FDA and other worldwide agencies are adopting this policy. In Europe, this has already taken place and delivery devices are viewed as separate entities subject to review as such under the Medical Device Directive. In the U.S., it is our intention to comply with the FDA regulations for devices.

        There can be no assurance that products that we develop, including devices designed by us and built by our contract manufacturers, will be approved, or will meet approval requirements, on a timely basis, the failure of which would have a materially adverse effect on us.

Patents and Proprietary Rights

        We routinely apply for patents for our innovations and for improvements to our technologies. We also rely on our trade secrets and know-how to protect our technologies and our competitive position. We plan to defend our proprietary technologies aggressively from infringement, misappropriation, duplication and discovery through our issued patents and our proprietary know-how.

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        Our patent portfolio contains patents and patent applications that encompass each of our technologies including Nektar Advanced PEGylation, SCF and Pulmonary technologies. Our Advanced PEGylation patents and patent applications cover reactive PEG derivatives, PEG-drug conjugates, PEG-based prodrugs and PEG-drug delivery vehicles. Our SCF patents and patent applications cover compositions and apparatuses for preparing particles using our SCF Technology. Our Pulmonary Technology patents and patent applications cover our integrated systems for pulmonary delivery of both large and small molecule drugs. Although our early Advanced PEGylation Technology patent applications were filed in the United States only, we routinely file patent applications on innovations and improvements in each of these areas on a worldwide basis.

        With regard to our Advanced PEGylation Technology patent portfolio, we have filed patent applications directed to activated PEG reagents having a variety of structures (branched or multi-armed PEGs, forked PEGs, linear PEGs, etc.) and reactive groups, methods of producing highly pure polymer reagents, PEG prodrugs having hydrolysable linkages, PEG-based hydrogels and alternative gel systems and PEG conjugates of certain molecules. Patents or patent applications have issued or have been published in many of these areas.

        SCF Technology involves contacting an active agent solution or suspension with a Supercritical fluid to precipitate active agent particles from the solution or suspension. The patents and patent applications cover both the method of forming the particles and apparatuses for carrying out the method and are not limited to the particular product made.

        Our Pulmonary Technology patent portfolio relates to pharmaceutical compositions and reagents, medical devices and equipment and methods for preparation, packaging and delivery of our pharmaceutical compositions. This portfolio involves spray drying solutions and suspensions to prepare particles of various morphologies. Patents that have issued in these areas cover our pulmonary inhaler devices, formulations for pulmonary delivery and methods for preparing, packaging and using these formulations and particular active agent formulations for delivery via the respiratory tract.

        The patent positions of pharmaceutical, biotechnology and drug delivery companies, including ours, are uncertain and involve complex legal and factual issues. There can be no assurance that patents we apply for will be issued, or that patents that are issued will be valid and enforceable. Even if such patents are enforceable, we anticipate that any attempt to enforce our patents could be time consuming and costly. Additionally, the coverage claimed in a patent application can be significantly reduced before the patent is issued. As a consequence, we do not know whether any of our pending patent applications will be granted with broad coverage or whether the claims that eventually issue or that have issued will be circumvented. Since publication of discoveries in scientific or patent literature often lag behind actual discoveries, we cannot be certain that we were the first inventor of inventions covered by our issued patents or pending patent applications or that we were the first to file patent applications for such inventions. Moreover, we may have to participate in interference proceedings declared by the U.S. Patent and Trademark Office and/or its equivalent agency abroad to determine priority of invention, which could result in substantial cost to us, even if the eventual outcome is favorable. An adverse outcome could subject us to significant liabilities to third parties, require disputed rights to be licensed from or to third parties or require us to cease using the technology in dispute.

        We are aware of numerous pending and issued U.S. and foreign patent rights and other proprietary rights owned by third parties that relate to pharmaceutical compositions and reagents, medical devices, and equipment and methods for preparation, packaging and delivery of our pharmaceutical compositions. We cannot predict with any certainty which, if any, patent references will be considered relevant to our technology by authorities in the various jurisdictions where such rights exist, nor can we predict with certainty which, if any, of these rights will or may be asserted against us by third parties. There can be no assurance that we can obtain a license to any technology that we determine we need on reasonable terms, if at all, or that we could develop or otherwise obtain

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alternate technology. The failure to obtain licenses if needed would have a material adverse effect on us.

        We also rely upon trade secret protection for our confidential and proprietary information. No assurance can be given that others will not independently develop substantially equivalent proprietary information and techniques or otherwise gain access to our trade secrets or disclose such technology, or that we can meaningfully protect our trade secrets.

        Third parties from time to time have asserted or may assert that we are infringing their proprietary rights based upon issued patents, trade secrets or know-how that they believe cover our technology. In addition, future patents may be issued to third parties that our technology may infringe. We could incur substantial costs in defending ourselves and our partners against any such claims. Furthermore, parties making such claims may be able to obtain injunctive or other equitable relief, which could effectively block our ability to develop or commercialize some or all of our products in the United States and abroad, and could result in the award of substantial damages. In the event of a claim of infringement, we and our partners may be required to obtain one or more licenses from third parties. There can be no assurance that our partners and we will be able to obtain such licenses at a reasonable cost, if at all. Defense of any lawsuit or failure to obtain any such required license could have a material adverse effect on us.

        Our ability to develop and commercialize our technologies will be affected by our or our partners' access to the drugs that are to be formulated. Many biopharmaceutical drugs, including some of those that are presently under development by us, are subject to issued and pending United States and foreign patent rights which may be owned by competing entities. There can be no assurance, that we or our partners will be able to provide access to drug candidates for formulation or that, if such access is provided, we or our partners will not be accused of, or determined to be, infringing a third party's rights and will not be prohibited from working with the drug or be found liable for damages that may not be subject to indemnification. Any such restriction on access or liability for damages would have a material adverse effect on us.

        It is our policy to require our employees and consultants, outside scientific collaborators, sponsored researchers and other advisors who receive confidential information from us to execute confidentiality agreements upon the commencement of employment or consulting relationships with us. These agreements provide that all confidential information developed or made known to the individual during the course of the individual's relationship with us is to be kept confidential and not disclosed to third parties except in specific circumstances. The agreements provide that all inventions conceived by an employee shall be our property. There can be no assurance, however, that these agreements will provide meaningful protection or adequate remedies for our trade secrets in the event of unauthorized use or disclosure of such information.

Competition

        We believe that products developed using our technologies will compete on the basis of one or more of the following parameters: efficacy, safety, reproducibility, patient convenience and cost. There is intense competition in each of our technology platforms including non-invasive delivery of proteins and peptides, less invasive delivery of peptides and proteins and improved formulation and delivery of small molecules by the most common routes of delivery including pulmonary, oral and injectable. In addition, a number of the products being developed using our technologies have direct and indirect competition from other companies including both drug delivery companies and pharmaceutical companies many of which are much larger and have more resources than we do.

        With respect to Nektar Advanced PEGylation Technology, there are a number of companies developing alternative PEGylation technology including PEGShop, Mountain View Pharmaceuticals, Inc., NOF, Valentis and a number of pharmaceutical companies. Indirect competitors

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to PEGylation for less invasive delivery of peptides and proteins include companies developing technologies for injectable controlled release such as liposomes, microparticles and hydrogels and molecule engineering approaches such as protein engineering, fusion proteins and protein glycosolation.

        With respect to Nektar Pulmonary Technology, there are a number of companies developing dry powder inhalers, metered dose inhalers and liquid inhalers including nebulizers that could compete with us. Companies such as Aradigm, AeroGen, Alkermes, Batelle, 3M, Quadrant, Skyepharma, and Vectura are all developing technologies that could compete with our pulmonary delivery systems.

        With respect to Nektar SCF Technology, there are a number of direct competitors developing competitive technology including Crititech, Lavipharm, Ferro Corp, Ethypharm, Eiffel Technologies, and others. Indirect competition for this technology comes from companies developing other ways of creating particles and improved dosage forms of small molecules for the most common routes of delivery.

        In the non-invasive delivery of insulin, we have direct competition from companies such as Aradigm, Alkermes, Quadrant/Microdose, Aerogen, and MannKind, all of which are working on pulmonary products and most with announced pharmaceutical partners and indirect competition from companies such as Nobex, Emisphere, Coremed and Generex, which are believed to be working on oral or buccal products.

        For each of our technology platforms, we believe we have competitive advantages for certain applications and molecules. We monitor the competitive situation across our technology applications and products and may attempt to develop in-house, in-license or acquire technologies that improve or expand our technology platforms in order to remain competitive.

        We are in competition with other drug delivery companies, drug discovery companies including molecule engineering companies, biopharmaceutical companies as well as other organizations and individual inventors many of whom have resources much greater than ours including financial, development and commercialization capabilities. Acquisition of competing companies including drug delivery companies by larger pharmaceutical companies could also enhance our competitors' position. Accordingly, our competitors could succeed in developing competing technologies and products and gain regulatory approval faster than us. Development of newer technologies and products could also render our technology and products less or noncompetitive or obsolete.

Employees and Consultants

        As of December 31, 2003 we had 668 employees, of which 556 employees were engaged in research and development, including manufacturing and quality activities, and 112 employees were engaged in general administration and business development. We have 178 employees who hold advanced degrees, of which 104 are Ph.D.s. None of our employees is covered by a collective bargaining agreement and we have experienced no work stoppages. We believe that we maintain good relations with our employees.

        To complement our own expertise, we utilize specialists in regulatory affairs, pulmonary toxicology, process engineering, manufacturing, quality assurance, device design, clinical trial design and business development. These individuals include certain of our scientific advisors as well as independent consultants. See Item 10 "Directors and Executive Officers of the Registrant".

General Information

        We were incorporated in California in 1990 and reincorporated in Delaware in 1998. We maintain our executive offices at 150 Industrial Road, San Carlos, California 94070. Our main telephone number is (650) 631-3100.

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        All Nektar brand and product names that we use in connection with our company and our products are trademarks or registered trademarks of Nektar Therapeutics, in the United States and other countries. This Form 10-K contains additional trade names, trademarks and service marks of other companies. We do not intend our use or display of other parties' trade names, or trademarks or service marks to imply a relationship with, or endorsement or sponsorship of, us by these other parties.

Available Information

        We file electronically with the Securities and Exchange Commission ("SEC") our annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K pursuant to Section 13(a) or 15(d) of the 1934 Act. The public may read or copy any materials we file with the SEC at the SEC's Public Reference Room at 450 Fifth Street, NW, Washington, DC 20549. The public may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330. The SEC maintains an Internet site that contains reports, proxy and information statements, and other information statements, and other information regarding issuers that file electronically with the SEC. The address of that site is www.sec.gov.

        You may obtain a free copy of our annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K and amendments to those reports on the day of filing with the SEC on our website at http://www.nektar.com, by contacting the Investor Relations Department at our corporate offices by calling (650) 631-3100 or by sending an e-mail message to investors@nektar.com.

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RISK FACTORS

        The following section should be read carefully in connection with evaluating our business. Any of the following factors could materially and adversely affect our business, financial position or results of operations.

If our collaborative partners that we depend on to obtain regulatory approvals and commercialization of our products are not successful, or if such collaborations fail, then our product development or commercialization of our products may be delayed or unsuccessful.

        Because we are in the business of developing technology for improving drug formulations and methods for drug delivery, and licensing these technologies to companies that make and sell drugs, we do not have the people and other resources to do the following things:

•

synthesize active pharmaceutical ingredients to be used as medicines;



•

design and conduct large scale clinical studies;



•

prepare and file documents necessary to obtain government approval to sell a given drug product; or



•

market and sell our products when and if they are approved.

        When we sign a collaborative development agreement or license agreement to develop a product with a drug or biotechnology company, the drug or biotechnology company agrees to do some or all of the things described above.

        Reliance on collaborative relationships poses a number of risks, including:

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the potential inability to control whether and the extent to which our collaborative partners will devote sufficient resources to our programs or products;



•

disputes which may arise in the future with respect to the ownership of rights to technology and/or intellectual property developed with collaborative partners;



•

disagreements with collaborative partners which could lead to delays in or termination of the research, development or commercialization of product candidates, or result in litigation or arbitration;



•

the potential for contracts with our collaborative partners to fail to provide significant protection or to be effectively enforced if one of these partners fails to perform. Collaborative partners have considerable discretion in electing whether to pursue the development of any additional products and may pursue alternative technologies or products either on their own or in collaboration with our competitors;



•

the potential for collaborative partners with marketing rights to choose to devote fewer resources to the marketing of our products than they do to products of their own development;



•

risks related to the ability of our collaborative partners to pay us; and



•

the potential for collaborative partners to terminate their agreements with us unilaterally for any or no reason.

        Given these risks, there is a great deal of uncertainty regarding the success of our current and future collaborative efforts.

        We have entered into collaborations in the past that have been subsequently terminated. If other collaborations are suspended or terminated, our ability to commercialize certain of our other proposed products could also be negatively impacted. If these efforts fail, our product development or

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commercialization of products could be delayed and our financial position and results of operations would be significantly harmed.

If Pfizer does not file an NDA for approval of Exubera® in the U.S., if the FDA or the EMEA do not timely approve any NDA or equivalent European regulatory submission for Exubera®, or if our collaboration with Pfizer is discontinued prior to the commercial launch of Exubera®, then our financial position and results of operations will be significantly harmed.

        We are developing with Pfizer an inhaleable version of insulin, Exubera®, for the treatment of Type 1 and Type 2 diabetes that will be administered using our Pulmonary Technology. Exubera® is currently in extended Phase III clinical trials. We currently depend on Pfizer as the source of a significant portion of our revenues. For each of the years ended December 31, 2003 and 2002, revenue from Pfizer accounted for 59% of our revenue. In March 2004, Pfizer and Aventis announced that the European Medicines Evaluation Agency (EMEA) has accepted the filing of a marketing authorization application for Exubera®. However, there can be no assurance that Exubera® will be approved for marketing or commercial use in the E.U. Delays in the filing of an Exubera® NDA will result in a delay in marketing approval in the U.S., and there can be no assurance that even if the NDA submission is filed, Exubera® will be approved for marketing and commercial use in the U.S. Among the factors that may delay the filing or approval of the NDA, the approval by the EMEA to market Exubera in the E.U., or the commercial launch of Exubera® in the U.S. or the E.U., or that may impact a decision to proceed at all with respect to any of the foregoing, are the following:

•

Pfizer is currently conducting studies to generate controlled long-term safety data with respect to Exubera®, in particular its affect on lung function, and the results of the studies may impact the filing of regulatory submissions or regulatory approvals.



•

Pfizer and its partner, Aventis, have been working with the FDA to determine the appropriate timing for submission of the Exubera® NDA in the U.S. The results of any discussions with the FDA with respect to the requirements for and timing of the submission of an NDA may impact the filing or approval of the NDA.



•

We may experience difficulties with respect to the processing of the dry powder formulation of inhaleable insulin, and the filling and packaging of the inhaleable insulin powder for Exubera®. We may not be able to transfer the filling and packaging technology to Pfizer for the large scale commercial production of Exubera®.



•

We, with our contract manufacturers, may experience difficulties with respect to the production of the pulmonary inhaler device for Exubera®, including the design, scale up and automation of the commercial manufacture of the pulmonary inhaler device for Exubera®, and any such difficulties may delay the filing and approval of the NDA or the approval to market in the E.U. Our contract manufacturers may also experience difficulties with respect to manufacturing the device in high volumes for commercial use.



•

Pfizer may elect for marketing or other reasons, to delay or not proceed with the filing of regulatory submissions for Exubera®, or if approved following any such filing, the commercial launch of Exubera®.

        The determination as to whether or when an NDA is filed with respect to Exubera® will be made by Pfizer in its discretion. If the filing or approval of the NDA is substantially delayed beyond the internal estimates we have made for purposes of budgeting and resource allocation, we may not have the financial ability to continue supporting the Exubera® program or be able to meet our contractual obligations relating to the commercial launch of Exubera®. In the event of any such delay, we may also elect to divert resources away from Exubera® related activities or otherwise reduce our activities relating to the Exubera® program. Any material delay in the filing for regulatory approval or material delay in receiving regulatory approval (which in some countries includes pricing approval), or failure to

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receive regulatory approval for Exubera® at all, would affect our contract research revenue from Pfizer, may result in the payment by us of substantial reimbursements to the contract manufacturers of our proprietary inhaler device with respect to the capital they have deployed in support of such activity, and would significantly harm our financial position and results of operations. Furthermore, should the collaboration with Pfizer be discontinued, our financial position and results of operations may be substantially harmed.

If we fail to establish future successful collaborative relationships, then our financial results may suffer and our product development efforts may be delayed or unsuccessful.

        We intend to seek future collaborative relationships with pharmaceutical and biotechnology partners to fund some of our research and development expenses and to develop and commercialize potential products. Further, we anticipate that the timing of drug development programs under existing collaborative agreements with our partners will continue to affect our revenues from such agreements. We may not be able to negotiate acceptable collaborative arrangements in the future, and any arrangements we do negotiate may not be successful. If we fail to establish additional collaborative relationships, we will be required to undertake research, development, marketing, and manufacturing of our proposed products at our own expense or discontinue or reduce these activities.

If we are unable to establish successful collaborative relationships for our early-stage proprietary product development, then our financial results may suffer and our product development efforts may be delayed or unsuccessful.

        We intend to seek future collaborative relationships with pharmaceutical and biotechnology partners to fund some clinical trials and other development expenses associated with the development and commercialization of products developed through our Proprietary Products Group. We may not be able to negotiate acceptable collaborative arrangements in the future with respect to these products, and any arrangements we do negotiate may not be successful. If we fail to establish these collaborative relationships, we will have expended significant funds of our own in developing these products, and not get a return on our investment. We may then be required to undertake further development, marketing, and manufacturing of these products at our own expense or discontinue or reduce these activities altogether. As a result, failure to establish successful collaborative relationships for these products with pharmaceutical and biotechnology partners will cause our financial results to suffer and delay or terminate the development of such products.

If our drug delivery technologies are not commercially feasible, then our revenues and results of operations will be impacted negatively.

        We are in an early stage of development with respect to many of our products. There is a risk that our technologies will not be commercially feasible. Even if our technologies are commercially feasible, they may not be commercially accepted across a range of large and small molecule drugs. We have tested 13 drug formulations based on our Pulmonary Technology in humans. None of the products using our Pulmonary Technology have been approved for marketing; Exubera is in Phase III and some other products are in Phase I clinical trials. Our Advanced PEGylation Technology has been incorporated in five products that the FDA has approved for marketing and one additional product approved in Europe, and 11 others are in clinical trials. Our Supercritical Fluid Technology is also primarily in an early stage of feasibility. Our potential products require extensive research, development and preclinical and clinical testing. Our potential products also may involve lengthy regulatory reviews and require regulatory approval before they can be sold. We do not know if, and cannot provide assurance that, any of our potential products will prove to be safe and effective, accomplish the objectives that we and our collaborative partners are seeking through the use of our technologies, meet regulatory standards or continue to meet such standards if already approved. There is a risk that we and our collaborative partners may not be able to produce any of our potential products in commercial

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quantities at acceptable costs, or market them successfully. Failure to achieve commercial feasibility, demonstrate safety, achieve clinical efficacy, obtain regulatory approval or, together with partners, successfully market products will negatively impact our revenues and results of operations.

If our research and development efforts are delayed or unsuccessful, then we will experience delay or be unsuccessful in having our products commercialized, and our business will suffer.

        Except for our products that have already been approved by the FDA or other regulatory agencies, our product candidates are still in research and development, including preclinical testing and clinical trials. Preclinical testing and clinical trials are long, expensive and uncertain processes. It may take us or our collaborators several years to complete this testing, and failure can occur at any stage in the process. Success in preclinical testing and early clinical trials does not ensure that later clinical trials will be successful. A number of companies in the pharmaceutical and biotechnology industries have suffered significant setbacks in later stage clinical trials, even after promising results in earlier trials.

        Any clinical trial may fail to produce results satisfactory to us, our collaborative partners or the FDA. Preclinical and clinical data can be interpreted in different ways, which could delay, limit or prevent regulatory approval or commercialization. Negative or inconclusive results or adverse medical events during a clinical trial could cause a clinical trial to be repeated or a program to be terminated. We typically rely on collaborative partners and third-party clinical investigators to conduct clinical trials of our products and, as a result, we may face additional delaying factors outside our control.

        We do not know if any of our research and development efforts, including preclinical testing or clinical trials will adhere to our planned schedules or be completed on a timely basis or at all. Typically, there is a high rate of attrition for product candidates in preclinical and clinical trials.

If our drug delivery technologies do not satisfy certain basic feasibility requirements such as total system efficiency, then our products may not be competitive.

        We may not be able to achieve the total system efficiency for products based on our Pulmonary Technology that is needed to be competitive with alternative routes of delivery or formulation technologies. We determine total system efficiency by the amount of drug loss during manufacture, in the delivery system, and in reaching the ultimate site at which the drug exhibits its activity. We would not consider a drug to be a good candidate for development and commercialization using our Pulmonary Technology if drug loss is excessive at any one stage or cumulatively in the manufacturing and delivery process.

        Our ability to efficiently attach PEG polymer chains to a drug molecule is the initial screen for determining whether drug formulations using our Advanced PEGylation Technology are commercially feasible. We would not consider a drug formulation to be a good candidate for development and commercialization using our Advanced PEGylation Technology if we could not efficiently attach a PEG polymer chain to such drug without destroying or impairing the drug's activity.

        For our Supercritical Fluid Technology, solubility characteristics of a drug and the solvents, which may be incorporated in the manufacturing process, provide the initial screen for whether drug formulations using this technology are commercially feasible. We would not consider a drug to be a good candidate for this technology if its solubility characteristics were such that the application of our technology results in very low efficiency in manufacturing of drug powders.

If our drug formulations are not stable, then we will not be able to develop or commercialize products.

        We may not be able to identify and produce powdered or other formulations of drugs that retain the physical and chemical properties needed to work effectively with our inhaler devices for deep lung delivery using our Pulmonary Technology, or through other methods of drug delivery using our Advanced PEGylation or Supercritical Fluid Technology. Formulation stability is the physical and

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chemical stability of the drug over time and under various storage, shipping and usage conditions. Formulation stability will vary with each drug formulation and the type and amount of ingredients that are used in the formulation. Since our drug formulation technology is new and largely unproven, we do not know if our drug formulations will retain the needed physical and chemical properties and performance of the drugs. Problems with formulated drug powder stability in particular would negatively impact our ability to develop products based on our Pulmonary Technology or Supercritical Fluid Technology, or obtain regulatory approval for or market such products.

If our drug delivery technologies are not safe, then regulatory approval of our products may not be obtained, or our products may not be developed or marketed.

        We or our collaborative partners may not be able to prove that potential products using our drug delivery technologies are safe. Our products require lengthy laboratory, animal and human testing. Many of our products are in preclinical testing or the early stage of human testing. Since many of our products are in an early stage of testing and have not completed clinical trials, we cannot be certain that these products, and our technology that developed these products, are safe or will not produce unacceptable adverse side effects. The safety of our formulations will vary with each drug and the ingredients used in our formulation. If any product is found not to be safe, the product will not be approved for marketing or commercialization.

If product liability lawsuits are brought against us, we may incur substantial liabilities.

        The manufacture, testing, marketing and sale of medical products entail an inherent risk of product liability. If product liability costs exceed our liability insurance coverage, we may incur substantial liabilities. Whether or not we were ultimately successful in product liability litigation, such litigation would consume substantial amounts of our financial and managerial resources, and might result in adverse publicity, all of which would impair our business. We may not be able to maintain our clinical trial insurance or product liability insurance at an acceptable cost, if at all, and this insurance may not provide adequate coverage against potential claims or losses.

If the products using our Pulmonary Technology do not provide consistent doses of medicine, then we will not be able to develop, and our partners will not be able to obtain regulatory approval for and commercialize products.

        We may not be able to provide reproducible dosing of stable formulations of drug compounds. Reproducible dosing is the ability to deliver a consistent and predictable amount of drug into the bloodstream over time both for a single patient and across patient groups. Reproducible dosing of drugs based on our Pulmonary Technology requires the development of:

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an inhalation or other device that consistently delivers predictable amounts of dry powder to the deep lung;



•

accurate unit dose packaging of dry powder; and



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moisture resistant packaging.

        Since our Pulmonary Technology is still in development and is yet to be used in commercialized products, we cannot be certain that we will be able to develop reproducible dosing of any potential product. The failure to do so means that we would not consider such a product as a good candidate for development and commercialization.

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If we or our partners do not obtain regulatory approval for our products on a timely basis, then our revenues and results of operations may be affected negatively.

        There is a risk that we or our partners will not obtain regulatory approval (which in some countries includes pricing approval) for our unapproved products on a timely basis, or at all. Our unapproved products must undergo rigorous animal and human testing and an extensive FDA mandated or equivalent foreign authorities' review process. This process generally takes a number of years and requires the expenditure of substantial resources. The time required for completing such testing and obtaining such approvals is uncertain. The FDA and other U.S. and foreign regulatory agencies also have substantial discretion to terminate clinical trials, require additional testing, delay or withhold registration and marketing approval and mandate product withdrawals including recalls. The FDA has approved for marketing five products using our Advanced PEGylation Technology for specific uses in the United States. Further, another product using our Advanced PEGylation Technology has been approved in Europe. Even though our partners have obtained regulatory approval for some of our products, these products and our manufacturing processes are subject to continued review by the FDA and other regulatory authorities. Even if our partners receive regulatory approval of a product, the approval may limit the indicated uses for which our partners may market the product. In addition, our partners' marketed products, our manufacturing facilities and we, as the manufacturer in certain instances, will be subject to continual review and periodic inspections. Later discovery from such review and inspection of previously unknown problems may result in restrictions on our partners' products or on us, including withdrawal of our partners' products from the market. The failure to obtain timely regulatory approval of our partners' products, any product marketing limitations or a product withdrawal would negatively impact our revenues and results of operations.

        In addition, we may encounter delays or rejections based upon changes in FDA regulations or policies, including policies relating to current good manufacturing practice compliance, or "cGMP," during the period of product development. We may encounter similar delays in other countries.

If our technologies cannot be integrated successfully to bring products to market, then our ability to develop, and our partners' ability to obtain approval or market our products, may be delayed or unsuccessful.

        We may not be able to integrate all of the relevant technologies to provide complete drug delivery and formulation systems. In particular, our development of drugs based on our Pulmonary Technology relies upon the following several different but related technologies:

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dry powder formulations;



•

dry powder processing technology;



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dry powder packaging technology; and



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deep lung delivery devices.

        Our other technologies may face similar challenges relating to the integration of drug formulation, processing, packaging and delivery device technologies. At the same time we must:

•

establish collaborations with partners;



•

perform laboratory and pre-clinical testing of potential products; and



•

scale-up our manufacturing processes.

        We must accomplish all of these steps without delaying any aspect of technology development. Any delay in one component of product or business development could delay our ability to develop, and our partners' ability to obtain approval or market products using our delivery and formulation technologies.

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If we are not able to manufacture our products in commercially feasible quantities or at commercially feasible costs, then our products will not be successfully commercialized.

Nektar Advanced PEGylation Technology and Supercritical Fluid Technology

        Except for the five approved products and the one additional product approved in Europe incorporating our Advanced PEGylation Technology, all of the drug formulations which incorporate our Advanced PEGylation Technology and Supercritical Fluid Technology are in various stages of feasibility testing or human clinical trials. We are currently expanding our Advanced PEGylation Technology manufacturing capacity and anticipate having to add additional Supercritical Fluid Technology manufacturing capacity. If we are not able to scale-up to large clinical trials or commercial manufacturing for products incorporating either of these technologies in a timely manner or at a commercially reasonable cost, we risk not meeting our customers' supply requirements or our contractual obligations. Our failure to solve any of these problems could delay or prevent late stage clinical testing and commercialization of our products and could negatively impact our revenues and results of operations.

Nektar Pulmonary Technology

        Except for the one product incorporating our Pulmonary Technology that has been filed for approval in Europe, all of the drug formulations which incorporate our Pulmonary Technology are in various stages of human clinical trials or feasibility testing

        Powder Processing.    We have no experience manufacturing powder products for commercial purposes. With respect to drugs based on our Pulmonary Technology, we have only performed powder processing on the scale needed for testing formulations, and for early stage and larger clinical trials. We may encounter manufacturing and control problems as we attempt to scale-up powder processing facilities. We may not be able to achieve such scale-up in a timely manner or at a commercially reasonable cost, if at all, and the powder processing system we implement may not be applicable for other drugs. Our failure to solve any of these problems could delay or prevent some late stage clinical testing and commercialization of our products and could negatively impact our revenues and results of operations.

        To date, we rely primarily on two particular methods of powder processing. There is a risk that these technologies will not work with all drugs or that the cost of drug production with this processing will preclude the commercial viability of certain drugs. Additionally, there is a risk that any alternative powder processing methods we may pursue will not be commercially practical for aerosol drugs or that we will not have, or be able to acquire the rights to use, such alternative methods.

        Powder Packaging.    Our fine particle powders and small quantity packaging utilized for drugs based on our Pulmonary Technology require special handling. We have designed and qualified automated filling equipment for small and moderate quantity packaging of fine powders. We face significant technical challenges in scaling-up an automated filling system that can handle the small dose and particle sizes of our powders in commercial quantities. There is a risk that we will not be able to scale-up our automated filling equipment in a timely manner or at commercially reasonable costs. Any failure or delay in such scale-up would delay product development or bar commercialization of products based on our Pulmonary Technology and would negatively impact our revenues and results of operations.

        There can be no assurance we will be able to manufacture products on our autofiller system in a timely manner or at a commercially reasonable cost; any delay or failure in further developing such technology would delay product development or inhibit commercialization of our products and would have a materially adverse effect on us.

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        Nektar Pulmonary Inhaler Device.    We face many technical challenges in developing our pulmonary inhaler device to work with a broad range of drugs, to produce such devices in sufficient quantities, and to adapt the devices to different powder formulations. Our pulmonary inhaler device being used with Exubera® is still in clinical testing. Additional design and development work may be required to optimize the device for regulatory approval, field reliability, or other issues that may be important to its commercial success.

        Additional design and development work may lead to a delay in regulatory approval and delay efforts to seek regulatory approval for any product that incorporates the device or the time the device could be ready for commercial launch. In addition, we are attempting to develop a smaller inhaler device, which presents particular technical challenges. There is a risk that we will not successfully achieve any of these challenges. Our failure to overcome any of these challenges would negatively impact our revenues and results of operations.

        For late stage clinical trials and initial commercial production, we intend to use one or more contract manufacturers to produce our pulmonary inhaler devices. There is a risk that we will not be able to maintain arrangements with our contract manufacturers on commercially acceptable terms or at all, or effectively scale-up production of our pulmonary inhaler devices through contract manufacturers. Our failure to do so would negatively impact our revenues and results of operations. Dependence on third parties for the manufacture of our pulmonary inhaler devices and their supply chain may adversely affect our cost of goods and ability to develop and commercialize products on a timely or competitive basis. Because our manufacturing processes and those of our contract manufacturers are very complex and subject to lengthy governmental approval processes, alternative qualified production sources or capacity may not be available on a timely basis or at all. Disruptions or delays in our manufacturing processes or those of our contract manufacturers for existing or new products could result in increased costs, loss of revenues or market share, or damage to our reputation.

        There is no assurance that devices designed by us and built by contract manufacturers will be approved or will meet approval requirements on a timely basis or at all, or that any of our device development will be successful or commercially viable.

If Pfizer is not able to fill the bulk drug powders for Exubera® in commercially feasible quantities, then Exubera® will not be successfully commercialized and would negatively impact our revenues and results of operations.

        We have developed a high capacity automated filling unit capable of filling blisters on a production scale for moderate and large volume products using our Pulmonary Technology. The technology for the high capacity automated filling unit has been transferred to Pfizer who will have the responsibility of packaging and filling the bulk drug powders for Exubera®. There are significant technical challenges in scaling-up an automated filling system that can handle the small dose and particle sizes of our powders in commercial quantities. In addition, there is the additional risk that Pfizer has no backup manufacturing facility for this process. Any failure or delay in the manufacturing facility or process would delay product development or bar commercialization of Exubera® and would negatively impact our revenues and results of operations.

If we are not able to manufacture our dry powder inhaler device in commercially feasible quantities or at commercially feasible costs, then our Pulmonary Technology products may not be successfully commercialized.

        In addition to our inhaler device being used with Exubera®, we are developing a breath actuated compact dry powder inhaler device ("DPI"). We are developing the DPI device to be appropriate for the delivery of either large or small molecules for short-term use. We face many unique technical challenges in developing the DPI device to work with a broad range of drugs, producing the DPI device in sufficient quantities and adapting the DPI device to different powder formulations. Our DPI device

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is still in clinical testing and production scale-up work is ongoing. Further design and development will be required to obtain regulatory approval for the DPI device, enable commercial manufacturing, insure field reliability or manage other issues that may be important to its commercial success. Such additional design and development work may lead to a delay in efforts to seek regulatory approval for any product that incorporates the DPI device, or could delay the timeframe within which the device could be ready for commercial launch. There is a risk that we will not successfully achieve any of these challenges. Our failure to overcome any of these challenges would negatively impact our revenues and results of operations.

We depend on sole or exclusive suppliers for our pulmonary inhaler devices, bulk active pharmaceutical ingredients and PEG polymer chains and if such suppliers fail to supply when required, then our product development efforts may be delayed or unsuccessful.

        We agreed to subcontract the manufacture of our pulmonary inhaler devices used with Exubera® before commercial production. We have identified contract manufacturers that we believe have the technical capabilities and production capacity to manufacture such device and which can meet the requirements of cGMP. We are not certain that we will be able to maintain satisfactory contract manufacturing on commercially acceptable terms, if at all. Our failure to maintain ongoing commercial relationships with our existing contract manufacturers may subject us to significant reimbursement obligations upon termination of such relationships. Our dependence on third parties for the manufacture of our pulmonary inhaler devices may negatively impact our cost of goods and our ability to develop and commercialize products based on our Pulmonary Technology on a timely and competitive basis.

        For the most part, we obtain the bulk active pharmaceutical ingredients we use to manufacture products using our technologies from sole or exclusive sources of supply. For example, with respect to our source of bulk insulin, we have entered into a collaborative agreement with Pfizer that has, in turn, entered into an agreement with Aventis to manufacture regular human insulin. Under the terms of their agreement, Pfizer and Aventis agreed to construct a jointly owned manufacturing plant in Frankfurt, Germany. Until needed, Pfizer will provide us with insulin from Aventis's existing plant. We have also entered into an agreement with one supplier for the supply of PEG polymer chains we use in our products that incorporate our Advanced PEGylation Technology. NOF Corporation is our sole supplier of pharmaceutical grade PEGylation materials pursuant to an agreement.

        If our sole or exclusive source suppliers fail to provide either active pharmaceutical ingredients or PEGylation materials in sufficient quantities when required, our revenues and results of operations will be negatively impacted.

If the market does not accept products using our drug delivery technologies, then our revenues and results of operations will be adversely affected.

        The commercial success of our potential products depends upon market acceptance by health care providers, third-party payors like health insurance companies and Medicare and patients. Our products under development use new drug delivery technologies and there is a risk that the market will not accept our potential products. Market acceptance will depend on many factors, including:

•

the safety and efficacy of products demonstrated in clinical trials;



•

favorable regulatory approval and product labeling;



•

the frequency of product use;



•

the ease of product use;

34

•

the availability of third-party reimbursement;



•

the availability of alternative technologies; and



•

the price of our products relative to alternative technologies.

        There is a risk that health care providers, patients or third-party payors will not accept products using our drug delivery and formulation technologies. If the market does not accept our potential products, our revenues and results of operations would be significantly and negatively impacted.

If our products are not cost effective, then government and private insurance plans may not pay for them and our products may not be widely accepted, which will adversely affect our revenues and results of operations.

        In both domestic and foreign markets, sales of our products under development will depend in part upon the availability of reimbursement from third-party payors, such as government health administration authorities, managed care providers, private health insurers and other organizations. In addition, such third-party payors are increasingly challenging the price and cost effectiveness of medical products and services. Significant uncertainty exists as to the reimbursement status of newly approved health care products. Legislation and regulations affecting the pricing of pharmaceuticals may change before regulatory agencies approve our proposed products for marketing. Adoption of such legislation and regulations could further limit reimbursement for medical products. A government or third-party payor decision not to provide adequate coverage and reimbursements for our products would limit market acceptance of such products.

If our competitors develop and sell better drug delivery and formulation technologies, then our products or technologies may be uncompetitive or obsolete and our revenues and results of operations will be adversely affected.

        We are aware of other companies engaged in developing and commercializing drug delivery and formulation technologies similar to our technologies. Some of our competitors with regard to our Pulmonary Technology include AeroGen, Inc., Alkermes, Inc., Aradigm Corporation, and MannKind. AeroGen and Aradigm are each developing liquid drug delivery systems, and Alkermes is working on a dry powder delivery system. Our competitors with regard to our Advanced PEGylation Technology include Valentis, Inc., Mountain View Pharmaceuticals, Inc. and SunBio PEG-SHOP, as well as several pharmaceutical and biotechnology companies with in-house PEGylation expertise. Some of our competitors with regard to our Supercritical Fluid Technology include Alkermes, Battelle Memorial Institute, Ethypharm SA, Ferro Corp., Lavipharm SA and RxKinetics. Some of these companies license or provide the technology to other companies, while others are developing the technology for internal use. Many of these companies have greater research and development capabilities, experience, manufacturing, marketing, financial and managerial resources than we do and represent significant competition for us. Acquisitions of or collaborations with competing drug delivery companies by large pharmaceutical or biotechnology companies could enhance our competitors' financial, marketing and other resources. Accordingly, our competitors may succeed in developing competing technologies, obtaining regulatory approval for products or gaining market acceptance before us. Developments by others could make our products or technologies uncompetitive or obsolete. Our competitors may introduce products or processes competitive with or superior to our products or processes.

If any of our patents are invalid or pending patents do not issue or following issuance are deemed not valid, then we may lose key intellectual property right protection. If our products infringe on third-party's rights, then we will suffer adverse effects on our ability to develop and commercialize products as well as our revenues and results of operations.

        We have filed patent applications covering certain aspects of our inhalation devices, powder processing technology, powder formulations and deep lung route of delivery for certain molecules as

35

well as for our Advanced PEGylation and Supercritical Fluid Technology, and we plan to file additional patent applications. As of December 31, 2003, we had 651 issued U.S. and foreign patents that cover certain aspects of our technologies and we have a number of patent applications pending. There is a risk that many of the patents applied for will not issue, or that any patents that issue or have issued will not be held valid and enforceable. Enforcing our patent rights would be time consuming and costly.

        Our access or our partners' access to the drugs to be formulated using our technologies will affect our ability to develop and commercialize our technologies. Many drugs, including powder formulations of certain drugs that are presently under development by us, and our drug formulation technologies are subject to issued and pending U.S. and foreign patents that may be owned by competitors. We know that there are issued patents and pending patent applications relating to the formulation and delivery of large and small molecule drugs, including several for which we are developing formulations using our various technologies. This situation is highly complex, and the ability of any one company, including us, to commercialize a particular drug is unpredictable.

        We intend generally to rely on the ability of our partners to provide access to the drugs that we formulate for deep lung and other forms of delivery. There is a risk that our partners will not be able to provide access to such drug candidates. Even if our partners provide such access, there is a risk that third parties will accuse, and possibly a court or a governmental agency will determine, our partners or us to be infringing a third-party's patent rights, and we will be prohibited from working with the drug or be found liable for damages that may not be subject to indemnification, or we may choose to pay such third party royalties under a license to such patent rights. Any such restriction on access to drug candidates, liability for damages or payment of royalties would negatively impact our revenues and results of operations.

We may incur material litigation costs, which may adversely affect our business and results of operations.

        From time to time, we are party to various litigation matters, including several which relate to our patent and intellectual property rights. We cannot predict with certainty the eventual outcome of any pending litigation or potential future litigation, and we might have to incur substantial expense in defending these or future lawsuits or indemnifying third parties with respect to the results of such litigation.

If earthquakes, tornadoes, hurricanes and other catastrophic events strike, our business may be negatively affected.

        Our corporate headquarters, including a substantial portion of our research and development operations, are located in the San Francisco Peninsula, a region known for seismic activity. A significant natural disaster such as an earthquake could have a material adverse impact on our business, operating results, and financial condition. There are no backup facilities for some of our manufacturing operations located in the San Francisco Peninsula. Certain of our other facilities, such as our facility in Huntsville, Alabama and certain of our collaborative partners located elsewhere may also be subject to catastrophic events such as hurricanes and tornadoes, any of which could have a material adverse effect on our business, operating results, and financial condition.

Investors should be aware of industry-wide risks, which are applicable to us and may affect our revenues and results of operations.

        In addition to the risks associated specifically with us described above, investors should also be aware of general risks associated with drug development and the pharmaceutical and biotechnology industries. These include, but are not limited to:

•

changes in and compliance with government regulations;

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•

handling and disposal of hazardous materials;



•

workplace health and safety requirements;



•

hiring and retaining qualified people; and



•

insuring against product liability claims.

If we do not generate sufficient cash flow through increased revenues or raising additional capital, then we may not be able to meet our substantial debt obligations.

        As of December 31, 2003, we had approximately $360.0 million in long-term convertible subordinated notes and debentures, $31.7 million in non-current capital lease obligations and $12.0 million in other long-term liabilities. Our substantial long-term indebtedness, which totaled $403.7 million as of December 31, 2003, has and will continue to impact us by:

•

making it more difficult to obtain additional financing; and



•

constraining our ability to react quickly in an unfavorable economic climate.

        Currently we are not generating positive cash flow. Delay in the approval of Exubera®, or other adverse occurrences related to our product development efforts will adversely impact our ability to meet our obligations to repay the principal amounts on our convertible subordinated notes and debentures when due. In addition, because of a decline in the market price of our common stock, it has become highly unlikely that the holders of a large percentage of our outstanding convertible subordinated notes and debentures will convert such securities to equity in accordance with their existing terms. If we are unable to satisfy our debt service requirements, substantial liquidity problems could result. As of December 31, 2003 we had cash, cash equivalents and short-term investments valued at approximately $286.0 million. We expect to use a substantial portion of these assets to fund our on-going operations over the next few years. As of December 31, 2003, we had approximately $360.0 million outstanding convertible subordinated notes and debentures, of which $7.7 million, $183.0 million and $169.3 million in principal amount will mature in 2006, 2007 and 2010, respectively. We may not generate sufficient cash from operations to repay our convertible subordinated notes and debentures or satisfy any other of these obligations when they become due and may have to raise additional financing from the sale of equity or debt securities or otherwise restructure our obligations in order to do so. There can be no assurance that any such financing or restructuring will be available to us on commercially acceptable terms, if at all.

If we cannot raise additional capital our financial condition may suffer.

        Our capital needs may change as a result of numerous factors, and may result in additional funding requirements. In addition, we may choose to raise additional capital due to market conditions or strategic considerations. To the extent that additional capital is raised through the sale of equity or convertible debt securities, the issuance of such securities could result in dilution to our stockholders.

        We have no material credit facility or other material committed sources of capital. To the extent operating and capital resources are insufficient to meet future requirements, we will have to raise additional funds to continue the development and commercialization of our technologies and products. Such funds may not be available on favorable terms, or at all. In particular, our substantial leverage may limit our ability to obtain additional financing. In addition, as an early stage biotechnology company, we do not qualify to issue investment grade debt and therefore any financing we do undertake will likely involve the issuance of equity, convertible debt instruments and/or high-yield debt. These sources of capital may not be available to us in the event we require additional financing. If adequate funds are not available on reasonable terms, we may be required to curtail operations significantly or obtain funds by entering into financing, supply or collaboration agreements on unattractive terms. Our inability to raise capital could negatively impact our business.

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If we fail to manage our growth effectively, our business may suffer.

        Our ability to offer commercially viable products, achieve our expansion objectives, manage our growth effectively and satisfy our commitments under our collaboration agreements depends on a variety of factors, all of which must be successfully managed. Key factors include our ability to develop products internally, enter into strategic partnerships with collaborators, attract and retain skilled employees and effectively expand our internal organization to accommodate anticipated growth including integration of any potential businesses that we may acquire. If we are unable to manage some or all of these factors effectively, our business could grow too slowly or too quickly to be successfully sustained, thereby resulting in material adverse effects on our business, financial condition and results of operations.

If we acquire additional companies, products or technologies, we may not be able to effectively integrate personnel and operations and such failure may disrupt our business and results of operations.

        We have acquired companies, products and/or technologies in the past, and may continue to acquire or make investments in complementary companies, products or technologies in the future. We may not receive the anticipated benefits of these acquisitions or investments. We may face risks relating to difficult integrations of personnel, technology and operations, uncertainty whether any integration will be successful and whether earnings will be negatively affected, and potential distractions to our management with respect to these acquisitions. In addition, our earnings may suffer because of acquisition-related costs.

We expect to continue to lose money for the next few years and may not reach profitability if our products do not generate sufficient revenue.

        We have never had a profitable year and, through December 31, 2003, we have an accumulated deficit of approximately $596.0 million. We expect to continue to incur substantial and potentially increasing losses over at least the next few years as we expand our research and development efforts, testing activities and manufacturing operations, and as we further expand our late stage clinical and early commercial production facilities. Most of our potential products are in the early stages of development. Except for the approved products incorporating our Advanced PEGylation Technology, we have generated no revenues from product sales. Our revenues to date have consisted primarily of payments under short-term research and feasibility agreements and development contracts.

        To achieve and sustain profitable operations, we must, alone or with others, successfully develop, obtain regulatory approval for, manufacture, introduce, market and sell products using our drug delivery technologies. There is risk that we will not generate sufficient product or contract research revenue to become profitable or to sustain profitability.

Anti-takeover provisions in our charter documents and under Delaware law may make it more difficult to acquire us, even though such acquisitions may be beneficial to our stockholders.

        Provisions of our certificate of incorporation and bylaws, as well as provisions of Delaware law, could make it more difficult for a third party to acquire us, even though such acquisitions may be beneficial to our stockholders. These anti-takeover provisions include:

•

establishment of a classified board of directors such that not all members of the board may be elected at one time;



•

lack of a provision for cumulative voting in the election of directors, which would otherwise allow less than a majority of stockholders to elect director candidates;



•

the ability of our board to authorize the issuance of "blank check" preferred stock to increase the number of outstanding shares and thwart a takeover attempt;

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•

prohibition on stockholder action by written consent, thereby requiring all stockholder actions to be taken at a meeting of stockholders;



•

establishment of advance notice requirements for nominations for election to the board of directors or for proposing matters that can be acted upon by stockholders at stockholder meetings; and



•

limitations on who may call a special meeting of stockholders.

        Further, we have in place a preferred share purchase rights plan, commonly known as a "poison pill." The provisions described above, our "poison pill" and provisions of Delaware law relating to business combinations with interested stockholders may discourage, delay or prevent a third party from acquiring us. These provisions may also discourage, delay or prevent a third party from acquiring a large portion of our securities, or initiating a tender offer or proxy contest, even if our stockholders might receive a premium for their shares in the acquisition over the then current market prices.

We expect our stock price to remain volatile.

        Our stock price is volatile. In the last twelve-month period ending January 31, 2004, based on closing bid prices on The Nasdaq National Market, our stock price ranged from $4.46 to $19.31. We expect our stock price to remain volatile. A variety of factors may have a significant effect on the market price of our common stock, including:

•

clinical trial results or product development delays or delays in product approval or launch;



•

announcements by collaboration partners as to their plan or expectations related to products using our technologies;



•

announcement or termination of collaborative relationships by us or our competitors;



•

fluctuations in our operating results;



•

developments in patent or other proprietary rights;



•

announcements of technological innovations or new therapeutic products;



•

governmental regulation;



•

public concern as to the safety of drug formulations developed by us or others; and



•

general market conditions.

        Any litigation brought against us as a result of this volatility could result in substantial costs and a diversion of our management's attention and resources, which could negatively impact our financial condition, revenues, results of operations, and the price of our common stock.

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EXECUTIVE OFFICERS OF THE REGISTRANT

        The following table sets forth the names, ages and positions of our executive officers as of January 31, 2004:

(1)

On March 4, 2004, J. Milton Harris's title changed to Chief Scientific Officer, Nektar AL, and as of this date, he is no longer a Section 16 officer.

        Robert B. Chess has served as Executive Chairman of our board since April 1999, and as a director since May 1992. Mr. Chess served as Co-Chief Executive Officer from August 1998 to April 2000, as President from December 1991 to August 1998, and as Chief Executive Officer from May 1992 to August 1998. From September 1990 until October 1991, he was an Associate Deputy Director in the White House Office of Policy Development. In March 1987, Mr. Chess co-founded Penederm Incorporated, a topical dermatological drug delivery company, and served as its President until February 1989. Prior to co-founding Penederm, Mr. Chess held management positions at Intel Corp., a semiconductor manufacturer, and Metaphor, a computer software company (acquired by International Business Machines Corp.). Mr. Chess holds a B.S. in Engineering from the California Institute of Technology and an M.B.A. from the Harvard Business School. Mr. Chess is a director of Pharsight Corp., a software company, Biotechnology Industry Organization, a trade organization serving and representing the emerging biotechnology industry and ChemGenex, Inc., a cancer therapeutics company.

        Ajit S. Gill has served as our Chief Executive Officer since April 2000, as President since April 1999, and as a director since April 1998. From August 1998 to April 2000, Mr. Gill served as our Co-Chief Executive Officer. From October 1996 to August 1998, Mr. Gill served as our Chief Operating Officer and directed our Technical Operations organization, including research and development. From January 1993 to October 1996, Mr. Gill served as our Chief Financial Officer. Before joining us, Mr. Gill was Vice President and General Manager of Kodak's Interactive Systems Products Division. Mr. Gill has served as Vice President, Finance and Chief Financial Officer for TRW-Fujitsu and Director of Business Development for VisiCorp, a pioneer in the personal computer software market. He holds a Bachelor of Technology from the Indian Institute of Technology, an M.S. in Electrical Engineering from the University of Nebraska, and an M.B.A. from the University of Western Ontario.

        Ajay Bansal has served as our Vice President of Finance and Administration and Chief Financial Officer since February 2003. From July 2002 until joining Nektar, Mr. Bansal served as Director of Operations Analysis at Capital One Financial. From August 1998 to June 2002, Mr. Bansal was at Mehta Partners LLC, a financial advisory firm and was a Partner there since January 2000. Prior to joining Mehta Partners LLC, Mr. Bansal spent more than 10 years in management roles at Novartis, a major pharmaceutical company, and in consulting at Arthur D. Little, Inc., McKinsey & Company, Inc.

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and ZS Associates. Mr. Bansal holds a Bachelor of Technology from the Indian Institute of Technology, an M.S. in Operations Management from Northwestern University and an M.B.A. from Northwestern University.

        John S. Patton, Ph.D., our co-founder, has served as Chief Scientific Officer since November 2001 and as a director since July 1990. Dr. Patton served as Vice President, Research from December 1991 to November 2001. He served as our President from incorporation in July 1990 to December 1991. From 1985 to 1990, Dr. Patton was a Project Team Leader with Genentech, Inc., a biotechnology company, where he headed their non-invasive drug delivery activities. Dr. Patton was on the faculty of the Marine Science and Microbiology Departments at the University of Georgia from 1979 through 1985, where he was granted tenure in 1984. Dr. Patton received a B.S. in Zoology and Biochemistry from Pennsylvania State University, an M.S. from the University of Rhode Island, a Ph.D. in Biology from the University of California, San Diego and received post doctorate fellowships from Harvard Medical School and the University of Lund, Sweden, both in biomedicine. Dr. Patton is also a director of Saegis Pharmaceuticals, Inc., a biopharmaceutical company.

        J. Milton Harris, Ph.D., has served as Chief Scientific Officer of Nektar AL since March 2004. Dr. Harris served as President of Nektar AL since our acquisition of Shearwater in 2001 to March 2004. Dr. Harris founded Shearwater in 1992. Before founding Shearwater, Dr. Harris was the Distinguished Professor of Chemistry and Materials Science at the University of Alabama in Huntsville from 1985 to 1992. Dr. Harris received his B.S. in chemistry from Auburn University and Ph.D. in organic chemistry from the University of Texas in Austin. Dr. Harris is a director of Expression Genetics, Inc., a biotechnology company.

Item 2. Properties

        We currently lease facilities in San Carlos, California, two facilities in Huntsville, Alabama and a complex in Bradford, England.

        We currently occupy a facility in San Carlos that covers approximately 230,000 square feet and is leased pursuant to a 15-year lease agreement expiring in October 2011. This facility serves as our corporate headquarters and is used for research and development, manufacturing and administration. This manufacturing facility operates under FDA current GMP and has been approved and licensed by the State of California to manufacture clinical supplies for use in human clinical trials.

        In October 1999, we commenced construction of a second San Carlos facility on a 4.7-acre parcel of land that we had acquired in October 1998, in order to expand our administrative offices and research and development capacity. This facility consists of approximately 170,000 square feet. In October 2000, we leased back the facility pursuant to a build-to-suit lease agreement for a 16-year term, with a 10-year option and a second 8-year option to extend the lease. In November 2000 we took occupancy of approximately 80,000 square feet of this facility. In October 2001, we leased an additional 45,600 square feet in this facility and declined an option to lease an additional 46,500 square feet.

        We have two locations in Huntsville, Alabama related to our Advanced PEGylation Technology operations. Our Church Street location is the site for the manufacture of PEG derivatives and is approximately 35,000 square feet with a lease term expiring in June 2009. We are currently in the process of expanding our facility on Church Street by an additional 50,000 square feet. Our Discovery Drive location is approximately 50,000 square feet and is leased by us. This facility houses research and development and administrative offices.

        We currently occupy a complex in Bradford, England that covers approximately 17,500 square feet, consisting of several units with varying lease terms through 2009. This facility is used for research and development, clinical research and administration related to our supercritical fluids technology.

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Item 3. Legal Proceedings

        From time to time, we may be involved in lawsuits, claims, investigations and proceedings, consisting of intellectual property, commercial, employment and other matters, which arise in the ordinary course of business. In accordance with the Statement of Financial Accounting Standards ("SFAS") No. 5, Accounting for Contingencies, we make a provision for a liability when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. These provisions are reviewed at least quarterly and adjusted to reflect the impact of negotiations, settlements, ruling, advice of legal counsel, and other information and events pertaining to a particular case. Litigation is inherently unpredictable. However, we believe that we have valid defenses with respect to the legal matters pending against us, as well as adequate provisions for any probable and estimable losses. If any unfavorable ruling were to occur in any specific period, there exists the possibility of a material adverse impact on the results of operations of that period. We believe that, given our current liquidity and cash and investment balances, even if we receive an adverse judgment with respect to litigation to which we are currently a party, such judgment would not have a material impact on cash and investments or liquidity.

Item 4. Submission of Matters to a Vote of Security Holders

        No matters were submitted to a vote of our security holders in the quarter ended December 31, 2003.

PART II

Item 5. Market for Registrant's Common Stock and Related Stockholder Matters

        Our Common Stock trades on the NASDAQ National Market under the symbol NKTR. The table below sets forth the high and low closing sales prices for our Common Stock (as reported on the NASDAQ National Market) during the periods indicated.

        As of January 31, 2004, there were approximately 375 holders of record of our Common Stock. We have not paid any cash dividends since our inception and do not intend to pay any cash dividends in the foreseeable future.

        Information regarding our equity compensation plans as of December 31, 2003 is disclosed in Item 12, Security Ownership of Certain Beneficial Owners and Management and Related Stockholders Matters and incorporated by reference from the definitive proxy statement for our 2004 Annual Meeting of Stockholders to be filed with the SEC pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this Form 10-K under the heading "Equity Compensation Plan Information."

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Sales of Unregistered Securities

        In February 2004, the holder of our outstanding Series B Convertible Preferred Stock converted an aggregate 15,953 shares of such stock into an aggregate 700,075 shares of our common stock. The conversion rate was approximately 43.88 common shares for each preferred share, which represents a conversion price of approximately $22.79 per share. We issued the shares of common stock under an exemption from the registration requirement of the 1933 Act provided by Section 3(a)(9) of the 1933 Act.

        In February 2004, in a limited number of privately negotiated transactions, certain holders of our outstanding 3% convertible subordinated notes due June 2010 (issued in October 2003) converted approximately $36.0 million in aggregate principal amount of such notes for shares of our common stock. The conversion price was $11.35 per share, for an aggregate of approximately 3.2 million shares of our common stock. In connection with the conversion, we agreed to pay $85.00 per $1,000 of the notes to be converted, for an aggregate payment of approximately $3.1 million. We recorded an expense of approximately $4.2 million associated with this transaction. We issued the shares of common stock under an exemption from the registration requirement of the 1933 Act provided by Section 3(a)(9) of the 1933 Act.

        In January 2004, in a privately negotiated transaction, certain holders of our outstanding 3.5% Convertible Subordinated Notes due October 2007 completed an exchange and cancellation of $9.0 million in aggregate principal amount of the notes held by such holders, for the issuance of an aggregate of 575,605 shares of our common stock. We recorded an expense of approximately $1.2 million associated with this transaction. We issued the shares of common stock under an exemption from the registration requirements of the 1933 Act provided by Section 3(a)(9) of the 1933 Act.

        In October 2003, in a limited number of privately negotiated transactions, certain holders of our outstanding 3.5% convertible subordinated notes due October 2007 exchanged and cancelled approximately $87.9 million in aggregate principal amount of the 3.5% notes, for the issuance of approximately $59.3 million in aggregate principal amount of newly issued 3% convertible subordinated notes due June 2010, pursuant to an exemption under Rule 506 and Section 3(a)(9) of the 1933 Act. The notes due June 2010 issued in the exchanges bear interest at a rate of 3% per annum and will mature in June 2010. The notes due June 2010 are convertible into shares of our Common Stock at the rate of approximately 88.1057 shares per $1,000 principal amount of notes, which is equivalent to an initial conversion price of $11.35 per share. The notes due June 2010 are redeemable in part or in total at any time before June 30, 2006 at a redemption price of $1,000 per $1,000 principal amount plus a provisional redemption exchange premium, payable in cash or shares of Common Stock, of $90.00 per $1,000 principal amount less the amount of any interest actually paid on such notes prior to the provisional redemption date, if the closing price of our Common Stock has exceeded 150% of the conversion price in effect for at least 20 trading days within a period of 30 consecutive trading days ending on the trading day before the date of mailing of the provisional redemption notice. The notes due June 2010 are also redeemable in part or in total at any time after June 30, 2006 by paying certain premiums on the notes based on the date of redemption. Interest on the notes due June 2010 is payable semi-annually on June 30 and December 30. Except pursuant to a limited pledge of collateral equal to the initial six payments of interest on the notes, the notes due June 2010 are subordinated to all of our present and future senior debt. The SEC declared effective a registration statement on Form S-3 (File No. 333-110677) registering the resale of these notes and the shares of common stock issuable upon conversion of the notes.

        In June 2003 and July 2003 we issued $100.0 million and $10.0 million aggregate principal amount of convertible subordinated notes, respectively, which are convertible at the option of the holder, at any time on or prior to maturity, into shares of our Common Stock. The notes were sold only in the United

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States to certain qualified institutional buyers under an exemption from registration provided by Rule 144A of the 1933 Act. The notes are convertible at an initial conversion price of $11.35 per share, which is equal to a conversion rate of approximately 88.1057 shares per $1,000 principal amount of notes, subject to adjustment. Interest on the notes will accrue at a rate of 3.0% per year. We will pay interest on the notes on June 30 and December 30 of each year to holders of record at the close of business on the preceding June 15 and December 15, respectively, beginning on December 30, 2003. The notes mature on June 30, 2010. We may redeem some or all of the notes at any time before June 30, 2006, at a redemption price of $1,000 per $1,000 principal amount plus a provisional redemption exchange premium payable in cash or shares of Common Stock, of $90.00 per $1,000 principal amount less the amount of any interest actually paid on such notes prior, to the provisional redemption date, if the closing price of our Common Stock has exceeded 150% of the conversion price then in effect for at least 20 trading days within a period of 30 consecutive trading days ending on the trading day before the date of mailing of the provisional redemption notice. We also may redeem some or all of the notes at any time after June 30, 2006 by paying certain premiums on the notes based on the date of redemption. Other than $9.9 million in aggregate principal amount of U.S. treasury securities pledged for the exclusive benefit of the holders of the notes, the notes are unsecured and subordinated to our existing and future senior indebtedness. Merrill Lynch & Co., Deutsche Bank Securities Inc., Lehman Brothers Inc., Friedman, Billings, Ramsey & Co., Inc., and SG Cowen Securities Corporation served as initial purchasers in the offering and received approximately $3.3 million in discounts and commissions. The SEC declared effective a registration statement on Form S-3, as amended, (File No. 333-108856) registering the resale of these notes and the shares of common stock issuable upon conversion of the notes.

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Item 6. Selected Consolidated Financial Data

SELECTED CONSOLIDATED FINANCIAL INFORMATION
(In thousands, except per share information)

        The selected consolidated financial data set forth below should be read together with the consolidated financial statements and related notes, "Management's Discussion and Analysis of Financial Condition and Results of Operations," and the other information contained in this Form 10-K.

(1)

Nektar changed its method of accounting for goodwill and other intangible assets in 2002 in connection with adopting a new accounting standard.

(2)

Basic and diluted net loss per share is based upon the weighted average number of common shares outstanding. The shares shown above retroactively reflect a two-for-one split, effective August 22, 2000.

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Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations

        The following discussion contains forward-looking statements that involve risks and uncertainties. Such statements are marked with and asterisk (*). Our actual results could differ materially from those discussed here. Factors that could cause or contribute to such differences include, but are not limited to, those discussed in this section as well as in Part I of this report under the heading "Risk Factors."

Overview

        On January 15, 2003 we changed our name from Inhale Therapeutic Systems, Inc. to Nektar Therapeutics. We believe our new name better reflects our broadened capabilities and approach to drug delivery. Our new corporate identity represents the integration of our three proprietary technology platforms developed through our internal research and development efforts as well as our acquisitions of Shearwater Corporation (now referred to as Nektar AL) and Bradford Particle Design, Ltd. (now referred to as Nektar UK).

        We are working to become one of the world's leading drug delivery products based companies by providing a portfolio of technologies and expertise that will enable us and our pharmaceutical partners to improve drug performance throughout the drug development process. To date the revenues we have received from the sales of our approved products and in connection with our collaborative arrangements have been insufficient to meet our operating and other expenses and we believe this will continue to be the case for several years. To date, except for sales from six products using Nektar Advanced PEGylation technology, we have not sold any commercial products and do not anticipate receiving significant revenue from product sales or royalties in the near future. The development of a successful product is dependent upon several factors that are outside of our control. These include, among other things, the need to obtain regulatory approval to market these products and our dependence upon our collaborative partners. As a result of these or other risks, potential products for which we have invested substantial amounts in research and development may never produce revenues or income.

        We have generally been compensated for research and development expenses during initial feasibility work performed under collaborative arrangements for all three of our technologies: Nektar Advanced PEGylation Technology, Nektar Pulmonary Technology, and Nektar Supercritical Fluid Technology. In a typical Advanced PEGylation Technology collaboration, we manufacture and supply the PEG reagents and receive manufacturing revenues and possible royalties from sales of the PEGylated commercial product. Prior to commercialization of pulmonary delivery and advanced PEGylation products, we receive revenues from our partners for partial or full funding of research and development activities and progress payments upon achievement of certain developmental milestones. In a typical Pulmonary Technology collaboration, our partner will provide the active pharmaceutical ingredient (the majority of which are already approved by the U.S. Food and Drug Administration ("FDA") in another delivery form), fund clinical and formulation development, obtain regulatory approvals, and market the resulting commercial product. We may manufacture and supply the drug delivery approach or drug formulation, and may receive revenues from drug manufacturing, as well as royalties from sales of most commercial products. In addition, for products using our Pulmonary Technology, we may receive revenues from the supply of our device for the product along with revenues for any applicable drug processing or filling. In addition to our partner-funded programs, we are applying our technologies independently through internal early-stage proprietary product development efforts. To achieve and sustain profitable operations, we, alone or with others, must successfully develop, obtain regulatory approval for, manufacture, introduce, market and sell products using our drug delivery and other drug delivery systems. There can be no assurance that we can generate sufficient product or contract research revenue to become profitable or to sustain profitability.

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        To fund the substantial expense related to our research and development activities, we have had to raise significant amounts of capital through the sale of equity and convertible debt. Our ability to meet the repayment obligations of our outstanding convertible debt, which as of December 31, 2003 totaled approximately $360.0 million in outstanding principal, is dependent upon our ability to develop successful products without unexpected significant delay or expense. Even if we are successful in this regard, we may require additional capital to repay the debt obligations.

        Our revenues generated from our collaborative arrangements increased as a result of achieving milestones during the year ended December 31, 2003. Revenues from product sales also increased, both in total amount and as a percentage of our overall revenues. Because of the magnitude of the revenues and resulting gross margins we receive, we do not expect that sales of our currently approved products will be sufficient for us to achieve profitability. Our ability to achieve profitability is dependent on the approval of and successful marketing of products with significant markets, and for which we realize relatively higher royalties.

        To address our ongoing working capital needs, we sold $110.0 million of convertible notes due June 2010 during the year ended December 31, 2003. We also attempted to address the timing of our repayment obligations by entering into privately negotiated transactions to exchange outstanding notes due in 2007 for notes due in 2010. While these transactions resulted in an overall reduction in our outstanding debt and an extension of the maturity of our repayment obligations, they also had a dilutive effect in that the notes issued in these transactions are convertible into approximately 3.5 million more shares of our common stock in the aggregate than the notes which were exchanged. We expect that we may need to raise additional capital in the future to fund our working capital requirements and further secure our ability to repay our outstanding indebtedness.

Recent Developments

        In March 2004, Pfizer and Aventis announced that the European Medicines Evaluation Agency ("EMEA") has accepted the filing of a marketing authorization application for Exubera®.

        In February 2004, the holder of our outstanding Series B Convertible Preferred Stock converted an aggregate 15,953 shares of such stock into an aggregate 700,075 shares of our common stock. The conversion rate was approximately 43.88 common shares for each preferred share which represents a conversion price of approximately $22.79 per share. We issued the shares of common stock under an exemption from the registration requirement of the 1933 Act provided by Section 3(a)(9) of the 1933 Act.

        In February 2004, we announced the existence of a collaboration with Roche under which we have licensed a proprietary PEG (pegylation) reagent used in the manufacture of Roche's product CERA (Continuous Erythropoiesis Receptor Activator). Under the collaboration, we receive milestone and manufacturing revenues during development and will receive royalty and manufacturing revenues upon successful commercialization of the product.

        In February 2004, in a limited number of privately negotiated transactions, certain holders of our outstanding 3% convertible subordinated notes due June 2010 (issued in October 2003) converted approximately $36.0 million in aggregate principal amount of such notes for shares of our common stock. The conversion price was $11.35 per share, for an aggregate of approximately 3.2 million shares of our common stock. In connection with the conversion, we agreed to pay $85.00 per $1,000 of the notes to be converted, for an aggregate payment of approximately $3.1 million. We recorded an expense of approximately $4.2 million associated with this transaction. We issued the shares of common stock under an exemption from the registration requirement of the 1933 Act provided by Section 3(a)(9) of the 1933 Act.

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        In January 2004, in a privately negotiated transaction, certain holders of our outstanding 3.5% Convertible Subordinated Notes due October 2007 completed an exchange and cancellation of $9.0 million in aggregate principal amount of the notes held by such holders, for the issuance of an aggregate of 575,605 shares of our common stock. We recorded an expense of approximately $1.2 million associated with this transaction. We issued the shares of common stock under an exemption from the registration requirements of the 1933 Act provided by Section 3(a)(9) of the 1933 Act.

        In January 2004, Celltech announced the initiation of Phase III trials for CDP 870 for Crohn's disease. CDP 870, which used our Advanced PEGylation Technology, is also being tested in Phase III trials for rheumatoid arthritis.

Recent Accounting Pronouncements

        In January 2003, the FASB issued FIN 46, Consolidation of Variable Interest Entities ("VIE"). FIN 46 requires a variable interest entity to be consolidated by the primary beneficiary of the entity if the equity investors in the entity do not have the characteristics of a controlling financial interest or do not have sufficient equity at risk for the entity to finance its activities without additional subordinated financial support from other parties. In December 2003, the FASB completed deliberations of proposed modifications to FIN 46 ("Revised Interpretations") resulting in multiple effective dates based on the nature as well at the creation date of the VIE. Special Purpose Entities ("SPEs") created prior to February 1, 2003 may be accounted for under the original or revised interpretation's provisions no later than December 31, 2003. We have not entered into any arrangements with VIEs created after January 31, 2003. In October 2000, we entered into a financing arrangement with a real estate partnership to complete construction of existing office facilities and provide financing for future capital improvements of up to $51.0 million. As a result of our continuing involvement and significant influence in the real estate partnership, and other provisions in the leasing transactions, the facility costs and capital lease obligations of the real estate partnership are recorded in our consolidated financial statements for all periods presented. We have consolidated the real estate partnership since its inception including property and equipment of $44.8 million and capital lease obligations of $31.2 million as of December 31, 2003. Our maximum exposure to loss with respect to the real estate partnership is equal to the outstanding capital lease obligation at December 31, 2003 of $31.2 million. The facility leased by our Alabama subsidiary is owned by Shearwater Polymers, LLC. This entity is 4% owned by Nektar, AL with the remaining 96% owned by J. Milton Harris who is one of our executive officers. Nektar, AL and Dr. Harris have jointly guaranteed the lease on the Nektar, AL facility. The adoption of FIN 46, as modified resulted in the consolidation of Shearwater Polymers, LLC, including property and equipment of $2.4 million, capital lease obligations of $1.8 million and minority interest (included in other long-term liabilities) of $0.6 million. Our maximum exposure to loss with respect to Shearwater Polymers, LLC, at December 31, 2003 is the outstanding capital lease obligation of $1.8 million.

        In November 2002, the FASB's Emerging Issues Task Force ("EITF") reached a consensus on Issue 00-21, Multiple-Deliverable Revenue Arrangements. EITF 00-21 addresses how to account for arrangements that involve the delivery or performance of multiple products, services, and/or rights to use assets. EITF 00-21 is applicable to agreements entered into after June 15, 2003. Our adoption of EITF 00-21 effective July 1, 2003 did not have a material impact on our financial position or results of operations.

Critical Accounting Estimates

        Our discussion and analysis of our financial condition and results of operations are based on our consolidated financial statements, which have been prepared in conformity with accounting principles generally accepted in the United States. It requires management to make estimates and assumptions

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that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Senior management has discussed the development, selection, and disclosure of each of the following critical accounting estimates with the audit committee.

Judgments Impacting Fixed Asset Capitalization

        Certain amounts have been expensed for plant design, engineering and validation costs based on our evaluation that it is unclear whether such costs are ultimately recoverable. These assets may become fully recoverable only if and when Exubera® is approved by the appropriate regulatory agencies and commercial production commences. The total amounts expensed amount to $6.6 million, $7.3 million, and $7.6 million for the years ended December 31, 2003, 2002, and 2001, respectively. The total amount capitalized amounted to $1.4 million, $4.6 million, and $4.4 million for the years ended December 31, 2003, 2002, and 2001, respectively. As of December 31, 2003 the capitalized net book value of such assets totals $25.1 million.

Impairment of Goodwill and Other Intangible Assets

        In accordance with SFAS No. 142 Goodwill and Other Intangible Assets, goodwill is subject to an impairment assessment. We have adopted a policy for measuring goodwill on an annual basis. Goodwill is tested for impairment using a two-step approach. The first step is to compare our fair value to our carrying amount, including goodwill. If the fair value is greater than the carrying amount, goodwill is not considered impaired and the second step is not required. If the fair value is less than the carrying amount, the second step of the impairment test measures the amount of the impairment loss, if any. In assessing the recoverability of our goodwill and other intangibles, we make assumptions regarding estimated future cash flows to determine the fair value of the respective assets. These estimates include forecasted revenues, which are difficult to predict. If these estimates change in the future, we may be required to record impairment charges for these assets. The impairment tests for goodwill are performed at the reporting unit level, which we have identified to be our only business segment. In the future, we may determine that impairment tests should be performed at a level below the reporting unit level, depending on whether certain criteria are met.

        In accordance with SFAS No. 144 Accounting for the Impairment or Disposal of Long-Lived Assets, we perform a test for recoverability of our intangible and other long-lived assets whenever events or changes in circumstances indicate that the carrying value of the assets may not be recoverable. An impairment loss would be recognized only if the carrying amount of an individual intangible asset exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposal of the asset. To date, we have not determined that there has been any such impairment.

Revenue Recognition

        Our research revenue is derived primarily from clients in the pharmaceutical and biotechnology industries and consists of reimbursement of development costs, reimbursement of certain expenses, payment for clinical supplies, and amortization of milestones. Payments received for milestones achieved are deferred and recorded as revenue ratably over the next period of continued development. Management makes its best estimate of the period of time until the next milestone is reached. This estimate affects the recognition of revenue for completion of the previous milestone. The original estimate is evaluated every three months to determine if circumstances have caused the estimate to change and if so, amortization of revenue is adjusted prospectively. An acceptable alternative milestone revenue recognition policy could have been adopted whereby the full milestone fee is recognized upon completion of the milestone. If we had adopted such a policy, our revenues recorded to date would

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have increased and our deferred revenues would have decreased by an immaterial amount compared to total revenue recognized.

Stock Based Compensation

        We apply the recognition and measurement principles of APB Opinion No. 25, Accounting for Stock Issued to Employees, and related Interpretations in accounting for our stock option plans. Under this opinion, no stock-based employee compensation expense is charged for options that were granted at an exercise price that was equal to the market value of the underlying common stock on the date of grant. Pro forma information regarding net income and earnings per share is required by SFAS 123, "Accounting for Stock-Based Compensation," as amended by SFAS 148, which also requires that the information be determined as if we had accounted for our employee stock options under the fair value method of that Statement.

        The fair value for these options was estimated at the date of grant using a Black-Scholes option-pricing model with the following weighted-average assumptions:

        The Black-Scholes options valuation model was developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of highly subjective assumptions including the expected stock price volatility. Because our employee stock options have characteristics significantly different from those of traded options, and because changes in the subjective input assumptions can materially affect the fair value estimate, in our opinion, the existing models do not necessarily provide a reliable single measure of the fair value of our employee and director stock options. However, we have presented the pro forma net loss and pro forma basic and diluted net loss per common share using the assumptions noted above.

        The following table illustrates the effect on net income and earnings per share if we had applied the fair value recognition provisions of SFAS 123 to stock-based employee compensation (in thousands, except per share information):

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Results of Operations

Years Ended December 31, 2003, 2002 and 2001

        The following table summarizes the dollar and percentage changes in the line items on our Statements of Operations for 2003 compared to 2002 and for 2002 compared to 2001 (in thousands, except percentages).

Revenue

        Revenue was $106.3 million for the year ended December 31, 2003 compared to $94.8 million and $77.5 million for the years ended December 31, 2002 and 2001, respectively. Revenue increased 12% in 2003 compared to 2002 levels and increased 22% in 2002 compared to 2001 levels. The increase in revenue for the year ended December 31, 2003, as compared to the year ended December 31, 2002 was due primarily to increases in product revenue as well as increased activities under our existing collaboration agreements with Chiron and Solvay. The 22% increase in revenue for the year ended December 31, 2002 as compared to the year ended December 31, 2001, was primarily due to increased activities under our existing collaborative agreement with Pfizer and Chiron and revenues from our acquired subsidiaries in 2001. Pfizer represented 59% of our revenue for the years ended December 31, 2003 and 2002, and 66% for the year ended December 31, 2001. Product sales accounted for 26% of revenues for the year ended December 31, 2003, as compared to 19% of revenues for the year ended December 31, 2002. Contract research revenue for the years ended December 31, 2003, 2002 and 2001 included reimbursed research and development expenses as well as the amortization of deferred up-front signing and progress payments received from our collaborative partners. Contract revenues are expected to fluctuate from year to year, and future contract revenue cannot be predicted accurately. The level of contract revenues depends in part upon future success in obtaining timely completion of feasibility studies, the continuation of existing collaborations, and achievement of milestones under current and future agreements. Product sales are dependent upon regulatory approval of new products for sale and adoption of current products in the market.

Cost of goods sold

        Cost of goods sold for the year ended December 31, 2003 was $14.7 million or 54% of product revenue. Cost of goods sold was $7.0 million for the year ended December 31, 2002 or 38% of product revenue. Cost of goods sold for the year ended December 31, 2001 was $4.2 million or 49% of product

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revenue. Cost of goods sold is highly influenced by the mix of products sold and their relative stage of commercial readiness.

Research and development

        Research and development expenses were $131.5 million for the year ended December 31, 2003, as compared to $157.4 million and $139.7 million for the years ended December 31, 2002 and 2001, respectively. The 16% decrease for the year ended December 31, 2003 as compared to the year ended December 31, 2002 was primarily attributable to the workforce reduction completed in December 2002. We also have deferred certain research and development expenses to 2004. The 13% increase for the year ended December 31, 2002 as compared to the year ended December 31, 2001 was primarily attributed to the increased spending on partner-funded programs and the operating expenses of our Nektar AL subsidiary. In addition, we made a one-time payment of $5.3 million to Alliance for the rights beyond pulmonary applications for PulmoSphere® technology and other considerations for the year ended December 31, 2002, which was expensed as research and development. We expect research and development spending to increase over the next few years as we continue to expand our development efforts under collaborative agreements using our expanded technology portfolio and to support our commercial manufacturing operations. * We forecast an increase in internally funded research spending in the next few years because we intend to increase the number of products we take through Phase I clinical testing and, in some cases, Phase II, before offering the products to our biopharmaceutical partners for commercialization. * We could have an additional one to two products in clinical trials as part of our proprietary products program by the end of 2004. *

        The following table summarizes our partner development programs for products approved for use or in clinical trials, including the indication for the particular drug or product, its present stage of

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clinical development or approval in the United States unless otherwise noted, and, with respect to our announced partner development programs, the identity of the corporate partner for such program.

(1)

Status means:

Approved—regulatory approval to market and sell product obtained.

Phase III—large-scale clinical trials conducted to obtain regulatory approval to market and sell a drug; initiated following encouraging Phase II trial results.

Phase II—clinical trials to establish dosing and efficacy in patients.

Phase I—clinical trials typically in healthy subjects to test safety. (Phase I trials for inhaled tobramycin and inhaled leuprolide were conducted by us prior to our collaborations with Chiron and Enzon, respectively. Chiron is currently conducting a Phase I trial with inhaled tobramycin, and Enzon may conduct a Phase I trial in the future with inhaled leuprolide).

        As of December 31, 2003, we currently have collaborations ongoing with more than 25 biotechnology and pharmaceutical companies, of which 21 are announced. Our product pipeline includes 5 products approved in the United States, 1 additional product approved in Europe, 4 products in Phase III trials, 7 products in Phase II trials, and 5 products in Phase I trials. The length of time that a project is in a given phase varies substantially according to factors relating to the trial, such as the type and intended use of the end product, the trial design, the ability to enroll suitable patients. Generally, a project's advancement from one phase to the next is dependent upon factors that are mostly controlled by our partners.

        Our research and development activities can be divided into research and preclinical programs, clinical development programs and commercial readiness. We estimate the costs associated with

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research and preclinical programs, clinical development programs and commercial readiness over the past three years to be the following (in thousands):

General and administrative

        General and administrative expenses were $22.0 million for the year ended December 31, 2003 as compared to $26.0 million and $18.9 million for the years ended December 31, 2002 and 2001, respectively. The 15% decrease in general and administrative expenses for the year ended December 31, 2003 as compared to December 31, 2002 was primarily due to the workforce reduction completed in December 2002. The 38% increase in general and administrative expenses for the year ended December 31, 2002 as compared to the year ended December 31, 2001 was primarily due to incremental support associated with our manufacturing and development efforts, including administrative staffing, business development and marketing.

        In December 2002, we recorded a charge of $2.6 million related to a workforce reduction of 73 employees, which represented about 10% of our base employees. The reduction affected all business functions and job classes mainly at our San Carlos facility. The $2.6 million charge included $1.7 million in severance compensation, $0.5 million in health benefits and $0.3 million in out placement services. Approximately $0.1 million was non-cash related to stock compensation. Approximately $2.1 million of this amount is included in research and development costs and $0.5 million is included in general and administrative costs. During December 2002, $0.9 million was paid out associated with severance and other employee benefits. At December 31, 2002, we had a remaining accrual of $1.6 million of which $1.4 million was paid out in the first quarter of 2003. The excess $0.2 million was reversed during the second quarter of 2003.

Purchased in-process research and development

        Purchased in process research and development ("IPR&D") represents the portion of the purchase price of an acquisition related to research and development activities which: (i) have not demonstrated their technological feasibility, and (ii) have no alternative future uses. For the years ended December 31, 2003 and 2002, we did not incur any IPR&D charges. For the year ended December 31, 2001, we incurred charges of $146.3 million related to our acquisitions of Bradford Particle Design and Shearwater Corporation.

        In June 2001, we completed our acquisition of Shearwater in exchange for approximately 4.0 million shares or options to acquire shares of our Common Stock and cash of $72.5 million. Of the total purchase consideration of $192.2 million, $115.2 million was allocated to the assets acquired based on their fair value on the date of acquisition, to IPR&D, and other intangible assets. The residual amount of $77.0 million was allocated to goodwill. Approximately $83.6 million of the purchase price was allocated to IPR&D, which was determined to have no alternative future use and was charged as an expense during the year ended December 31, 2001.

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        In January 2001, we acquired all of the outstanding share capital of Bradford Particle Design in exchange for approximately 3.75 million in newly issued shares of our Common Stock and approximately $20.4 million in cash. Of the total purchase consideration of $152.1 million, $78.4 million was allocated to the assets acquired based on their fair value on the date of acquisition, to IPR&D and to other intangible assets. The residual amount of $73.7 million was allocated to goodwill. Approximately $62.7 million of the purchase price was allocated to IPR&D, which was determined to have no alternative future use and was charged as an expense in the year-end ended December 31, 2001.

Amortization of other intangible assets

        Amortization of other intangible assets expenses were $4.5 million ($4.2 million included in operating expense and $0.3 million is included in cost of goods sold) for the year ended December 31, 2003 as compared to $4.5 million and $3.0 million for the years ended December 31, 2002 and 2001. This expense item increased $1.5 million from the year ended December 31, 2001 to December 31, 2002 due to the acquisition activity in 2001.

Amortization of goodwill

        There was no amortization of goodwill expenses for the years ended December 31, 2003 and 2002 as compared to $22.5 million for the year ended December 31, 2001. The decrease between the year ended December 31, 2002 and the year ended December 31, 2001 was associated with the adoption of SFAS 141, Business Combinations, and SFAS 142 Goodwill and Other intangible Assets, accounting standards on January 1, 2002 with respect to business combinations. No impairment charges have been recorded for the years ended December 31, 2003 or 2002. In accordance with SFAS 141 and 142, we discontinued the amortization of goodwill, which resulted in a decrease in reported net loss by approximately $31.6 million in 2002, as compared to the accounting prior to the adoption of SFAS 141 and 142. (See note 5, Goodwill and other Intangible Assets in the Notes to Consolidated Financial Statements of Part II, Item 8 of this Form 10-K).

Gain on debt extinguishment

        For the year ended December 31, 2003, gain on debt extinguishment totaled $31.2 million. Gain on debt extinguishment included a $4.3 million gain from the repurchase of $20.5 million of 3.5% convertible subordinated notes due October 2007 for $16.2 million during the second quarter of 2003. Gain on debt extinguishment also included a $26.9 million gain from the exchange of $87.9 million of 3.5% convertible subordinated notes due October 2007 for the issuance of $59.3 million of newly issued 3% convertible subordinated notes due June 2010, less $1.7 million of debt origination costs.

Other income/(expense)

        Other income/expense, net, was $1.0 million income for the year ended December 31, 2003, as compared to $1.0 million expense and $4.2 million expense for the years ended December 31, 2002 and 2001, respectively. Our equity investment in Alliance was determined to be fully impaired and a loss of $0.8 million and $3.9 million was recorded in the years ended December 31, 2002 and 2001, respectively.

Interest income

        Interest income was $5.4 million for the year ended December 31, 2003 as compared to $10.2 million and $24.6 million for the years ended December 31, 2002 and 2001. The $4.8 million decrease in interest income for the year ended December 31, 2003 as compared to December 31, 2002

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and the $14.4 million decrease in interest income for the year ended December 31, 2002 compared to December 31, 2001 was due to our lower cash and investment balances and lower interest rates.

Interest expense

        Interest expense was $17.9 million for the year ended December 31, 2003 as compared to $16.6 million and $13.4 million for the years ended December 31, 2002 and 2001. The $1.3 million increase in interest expense for the year ended December 31, 2003 as compared to December 31, 2002 primarily relates to the increase in principal amount of outstanding convertible subordinated notes resulting from our issuance in June and July 2003 of $110.0 million due June 2010. This expense was offset by the decrease in the interest payable on notes exchanged in certain privately negotiated transactions, and a reduction in the principal amount of outstanding notes resulting from such exchanges, and the repurchase of outstanding notes. The $3.2 million increase in interest expense for the year ended December 31, 2002 as compared to December 31, 2001 relates to the interest expense on our capital lease obligation associated with our build-to-suit lease for additional space leased at the end of 2001.

Provision for income taxes

        The provision for income taxes was $0.2 million for the year ended December 31, 2003 and nil for the years ended December 31, 2002 and 2001. The provision relates entirely to state taxes on our Alabama subsidiary.

Liquidity and Capital Resources

        We have financed our operations primarily through public and private placements of our debt and equity securities, revenue from development contracts, product sales and short-term research and feasibility agreements, financing of equipment acquisitions and tenant improvements, and interest income earned on our investments of cash. We do not utilize off-balance sheet financing arrangements as a source of liquidity or financing. At December 31, 2003 we had cash, cash equivalents and short-term investments of approximately $286.0 million.

        Our operations used cash of $76.2 million for the year ended December 31, 2003 as compared to $75.0 million and $50.8 million for the years ended December 31, 2002 and 2001, respectively. For the year ended December 31, 2003, the $76.2 million cash used in operations primarily reflected the net loss of $46.7 million and the non-cash gain on debt extinguishment of $31.2 million. For the year ended December 31, 2002, the $75.0 million of cash used in operations primarily reflects the net loss of $107.5 million, partially offset by depreciation and other changes in our balance sheet. For the year ended December 31, 2001, the $50.8 million of cash used in operations primarily reflects our net loss of $250.0 million, partially offset by $146.3 million of IPR&D associated with our acquisitions, $22.5 million in amortization of goodwill expenses, depreciation and changes in the balance sheet.

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        Cash flows provided by investing activities were $4.1 million for the year ended December 31, 2003 as compared to $40.3 million and $77.0 million cash used for the years ended December 31, 2002 and 2001, respectively. Cash flows for the year ended December 31, 2003 and 2002 were generated primarily by the sale and maturity of investment securities. These cash proceeds were either reinvested or used in operations. Cash used for investing activities in 2001 was primarily related to our acquisition activity. In connection with our 2001 acquisition of Bradford, we paid net cash of $14.8 million, which represented cash paid to Bradford's shareholders of $20.4 million, net of Bradford's cash balance of $5.6 million. The remainder of this acquisition was non-cash in nature. In connection with our 2001 acquisition of Shearwater, we paid net cash of $67.2 million, which represents cash paid to Shearwater's shareholders of $72.5 million, net of Shearwater's cash balance of $5.3 million. We purchased property and equipment of approximately $18.7 million, $16.3 million and $34.3 million during the years ended December 31, 2003, 2002 and 2001 respectively. The increase in purchased property and equipment in 2003 as compared to 2002 primarily reflects the cost of improvements made to our Huntsville, Alabama facility. The decrease in purchased property and equipment in 2002 as compared to 2001 primarily reflects the completion of the second phase of construction of a new San Carlos laboratory and office facility offset by continued investment in our commercial manufacturing facilities, including device manufacturing at third party contract manufacturers and expansion of our San Carlos powder processing facility.

        Cash flows provided by financing activities were $101.3 million for the year ended December 31, 2003, compared to $38.7 million and $22.6 million of the years ended December 31, 2002 and 2001, respectively. The increase in cash flow provided by financing activities in the year ended December 31, 2003 as compared to the year ended December 31, 2002 was primarily due to the issuance of $110.0 million of 3% convertible subordinated notes due 2010. The increase in cash flows provided by financing activities in the year ended December 31, 2002 as compared to December 31, 2001 was primarily related to our strategic alliance with Enzon which included a $40.0 million investment in our preferred stock offset by a decrease in capital lease financing related to our San Carlos lab facility that was substantially completed in 2000.

        We may continue to seek additional capital through sales of our debt and/or equity securities and additional financing of equipment acquisitions and tenant improvements.

        In June 2003, we entered into privately negotiated agreements with certain holders of our outstanding 3.5% convertible subordinated notes due in October 2007, for the repurchase of $20.5 million aggregate principal amount of the outstanding notes in exchange for cash payments of approximately $16.2 million. In connection with this repurchase, we recorded a gain of approximately $4.3 million for the early extinguishment of debt.

        In October 2003, in a limited number of privately negotiated transactions, certain holders of our outstanding 3.5% convertible subordinated notes due October 2007 exchanged and cancelled approximately $87.9 million in aggregate principal amount of the 3.5% notes, for the issuance of approximately $59.3 million in aggregate principal amount of newly issued 3% convertible subordinated notes due June 2010. In connection with this exchange, we recorded a gain of approximately $26.9 million for the early extinguishment of debt.

        At December 31, 2003, $121.6 million of 3.5% convertible subordinated notes due October 2007 remained outstanding. At December 31, 2003, $169.3 million of 3% convertible subordinated notes due June 2010 remained outstanding. In addition, as of December 31, 2003, $61.4 million of 5% convertible subordinated notes due February 2007 and $7.7 million of 6.75% convertible subordinated notes due October 2006 remained outstanding.

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        The following is a summary of our contractual obligations as of December 31, 2003 (in thousands):

(1)

Assumes current rate on Huntsville, AL tenant improvement loan remains at 5.17% over the entire term of the loan.

(2)

As a result of the conversions of debt for equity discussed in "Recent Developments" above, the liability for outstanding convertible notes and debentures as of February 29, 2004 stands at $315.0 million, of which approximately $7.7 million is due in 2006, $174.3 million is due in 2007, and approximately $133.0 million is due in 2010.

(3)

Of this amount $4.2 million relates to amounts committed to our general contractor in relation to the expansion of our facility in Alabama, $1.5 million relates to a contract with a major supplier, and the remaining $9.8 million consists of normal recurring inventory purchases and other purchases of items in the ordinary course of business expected to be paid for during the first quarter of 2004. Substantially all of this remaining $9.8 million had been ordered on definitive purchase orders as of December 31, 2003, but could be canceled by us at any time. If canceled, we could be charged restocking and/or cancellation fees ranging from 5% to 25%.

(4)

Consists of contractual obligations to certain partners. Does not include $4.8 million non-interest bearing loan from Pfizer, which is contingently payable upon commercial launch of Exubera®.

        In August 2000, we entered into a supply agreement with two contract manufacturers to provide for the manufacturing of our pulmonary inhaler device. Under the terms of the agreement, we may be obligated to reimburse both parties for the actual unamortized and unrecovered portion of any equipment procured or facilities established and the interest accrued for their capital overlay in the event that Exubera® does not gain FDA approval to the extent that the contract manufacturers cannot re-deploy the assets. At the present time, it is not possible to estimate the loss that will occur as a result of these obligations should Exubera® not be approved.

        Research and development costs will be dependent upon the number of collaborative agreements we are engaged in, the number of our internally funded projects and the timing of our transition to commercial manufacturing of our San Carlos, Alabama and UK locations. We forecast a increase in internally funded research spending in the next few years because we intend to increase the number of products we take through Phase I clinical testing and, in some cases, Phase II, before offering the products to potential biopharmaceutical partners for commercialization.*

*

This is a forward-looking statement that involves risks and uncertainties. Our actual results could differ materially from those discussed here. Factors that could cause or contribute to such differences include, but are not limited to, those discussed in this section as well as in Part I of this report under the heading "Risk Factors."

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        Given our current cash requirements, we forecast that we will have sufficient cash to meet our net operating expense requirements for at least the next two years. We plan to continue to invest in our growth and the need for cash will be dependent upon the timing of these investments. Our capital needs will depend on many factors, including continued scientific progress in our research and development arrangements, progress with preclinical and clinical trials, the time and costs involved in obtaining regulatory approvals, the costs of developing and the rate of scaling up each manufacturing operation of our technologies, the timing and cost of our late stage clinical and early commercial production facility, the costs involved in preparing, filing, prosecuting, maintaining and enforcing patent claims, the need to acquire licenses to new technologies and the status of competitive products. Of our outstanding convertible subordinated notes and debentures as of December 31, 2003, $7.7 million, $183.0 million, and $169.3 million will mature in 2006, 2007, and 2010, respectively. We are not able to satisfy all of these obligations through cash flow generated by our operations. To satisfy our long-term needs, we intend to seek additional funding, as necessary, from corporate partners and from the sale of securities. Because we are an early stage biotechnology company, we do not qualify to issue investment grade debt or have access to certain credit facilities. As a result, any financing we undertake will likely involve the issuance of equity, convertible debt instruments or high-yield debt to fund our working capital. To date we have been primarily dependent upon equity and convertible debt financings for capital and have incurred substantial debt as a result of our issuances of subordinated notes and debentures that are convertible into our Common Stock. Our substantial debt, the market price of our securities and the general economic climate, among other factors, could have material consequences for our financial position and could affect our sources of short-term and long-term funding. There can be no assurance that additional funds, if and when required, will be available to us on favorable terms, if at all.

Item 7A. Quantitative and Qualitative Disclosures of Market Risk

        The primary objective of our investment activities is to preserve principal while at the same time maximizing yields without significantly increasing risk. To achieve this objective, we invest in highly liquid and high quality debt securities. Our investments in debt securities are subject to interest rate risk. To minimize the exposure due to an adverse shift in interest rates, we invest in short term securities and maintain an average maturity of one year or less. A hypothetical 50 basis point increase in interest rates would result in an approximate $0.9 million decrease (less than 3%) in the fair value of our available-for-sale securities at December 31, 2003.

        The potential change noted above is based on sensitivity analyses performed on our financial position at December 31, 2003. Actual results may differ materially. The same hypothetical 50 basis point increase in interest rates would have resulted in an approximate $0.7 million decrease (less than 0.255%) in the fair value of our available-for-sale securities at December 31, 2002.

        Increases in the interest rates and fluctuations in our stock price could affect the fair market value of our convertible subordinated notes and debentures, which pay a fixed rate of interest. As of December 31, 2003, we had approximately $360.0 million in outstanding convertible subordinated notes and debentures with a fair value of $406.6 million.

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Item 8. Consolidated Financial Statements and Supplementary Data

NEKTAR THERAPEUTICS

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

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REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

The Board of Directors and Stockholders of
Nektar Therapeutics

        We have audited the accompanying consolidated balance sheets of Nektar Therapeutics as of December 31, 2003 and 2002, and the related consolidated statements of operations, stockholders' equity and cash flows for each of the three years in the period ended December 31, 2003. These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements based on our audits.

        We conducted our audits in accordance with auditing standards generally accepted in the United States. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

        In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of Nektar Therapeutics at December 31, 2003 and 2002, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2003, in conformity with accounting principles generally accepted in the United States.

        As discussed in the notes to the consolidated financial statements, in 2002 the Company changed its method of accounting for goodwill and other intangible assets.

        ERNST & YOUNG LLP

Palo Alto, California
February 19, 2004

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NEKTAR THERAPEUTICS

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands, except per share information)

See accompanying notes.

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NEKTAR THERAPEUTICS

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share information)