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INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

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As filed with the Securities and Exchange Commission on January 30, 2012

Registration No. 333-177611

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Amendment No. 1
to
FORM S-1
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933

Isola Group Ltd.
(Exact name of registrant as specified in its charter)

3100 West Ray Road, Suite 301
Chandler, Arizona 85226
(480) 893-6527
(Address, including zip code, and telephone number, including
area code, of registrant's principal executive offices)

Raymond P. Sharpe
President and Chief Executive Officer
Isola Group Ltd.
3100 West Ray Road, Suite 301
Chandler, Arizona 85226
(480) 893-6527
(Name, address, including zip code, and telephone number, including area code, of agent for service)

Approximate date of commencement of proposed sale to the public:
As soon as practicable after the effectiveness of this registration statement.

         If any of the securities being registered on this Form are being offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box.    o

         If this form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    o

         If this form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    o

         If this form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    o

         Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of "large accelerated filer", "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act. (Check one):

         The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until the registration statement shall become effective on such date as the Commission, acting pursuant to said Section 8(a), may determine.

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The information in this prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and we are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

                      Shares

Ordinary shares

This is the initial public offering of our ordinary shares. No public market currently exists for our ordinary shares. It is currently estimated that the initial public offering price will be between $             and $             per share.

We intend to apply to have our ordinary shares listed on the Nasdaq Global Market under the symbol "ISLA".

Investing in our ordinary shares involves a high degree of risk. Before buying any shares, you should carefully read the discussion of material risks of investing in our ordinary shares in "Risk Factors" beginning on page 11 of this prospectus.

Neither the Securities and Exchange Commission nor any other regulatory body has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The underwriters have the option, exercisable on or before the thirtieth day after the date of this prospectus, to purchase up to an additional                           ordinary shares from us at the public offering price, less the underwriting discounts and commissions, to cover over-allotments, if any.

The underwriters are offering the ordinary shares as set forth under "Underwriting". Delivery of the shares will be made on or about                           , 2012.

The date of this prospectus is                           , 2012

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You should rely only on the information contained in this prospectus. We and the underwriters have not authorized anyone to provide you with information different from that contained in this prospectus. We are offering to sell, and seeking offers to buy, ordinary shares only in jurisdictions where offers and sales are permitted. The information contained in this prospectus is accurate only as of the date on the front cover of this prospectus, or such other dates as are stated in this prospectus, regardless of the time of delivery of this prospectus or of any sale of our ordinary shares.

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Prospectus

Through and including                               (25 days after the commencement of the offering), all dealers effecting transactions in these securities, whether or not participating in this offering, may be required to deliver a prospectus. This is in addition to the dealer's obligation to deliver a prospectus when acting as an underwriter and with respect to unsold allotments or subscriptions.

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MARKET RANKING AND INDUSTRY DATA

This prospectus includes estimates of market share and industry data and forecasts that we obtained from industry publications and surveys, including market research firms and government sources, and internal company sources. Industry publications, surveys and forecasts generally state that the information contained therein has been obtained from sources believed to be reliable. In addition, certain market and industry data included in this prospectus, and our position and the positions of our competitors within these markets, are based on estimates of our management, which are primarily based on our management's knowledge and experience in the markets in which we operate. These estimates involve risks and uncertainties and are subject to change based on various factors, including those discussed under the heading "Risk Factors" in this prospectus.

Throughout this prospectus, when we refer to our "addressable" market for PCB laminate materials, or segments of our "addressable" market for PCB laminate materials, we exclude paper, composite and resin-coated copper laminate segments, portions of the FR-4 and specialty laminate segments, and the internal Japanese market, none of which are addressed by Isola.

TRADEMARKS AND TRADE NAMES

This prospectus contains registered and unregistered trademarks and service marks of us and our subsidiaries, as well as trademarks and service marks of third parties. All brand names, trademarks and service marks appearing in this prospectus are the property of their respective holders.

CONVENTIONS THAT APPLY IN THIS PROSPECTUS

Fiscal Year

In this prospectus, unless the context requires otherwise, references to fiscal 2011 are for the fiscal year ending December 31, 2011, references to fiscal 2010 are for the fiscal year ended January 1, 2011, references to fiscal 2009 are for the fiscal year ended December 26, 2009, references to fiscal 2008 are for the fiscal year ended December 27, 2008, references to fiscal 2007 are for the fiscal year ended December 29, 2007, references to fiscal 2006 are for the fiscal year ended December 30, 2006, references to fiscal 2005 are for the fiscal year ended December 31, 2005, and references to fiscal 2004 are for the fiscal year ended December 31, 2004.

Technical Terms

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"Dielectric" refers to an electrical insulator that can be polarized by an applied electric field. When a dielectric is placed in an electric field, electric charges do not flow through the material, as in a conductor, but only slightly shift from their average equilibrium positions causing dielectric polarization.

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"Dielectric Constant" refers to a measure of how close a material comes to free space (air) conditions and how constant these conditions hold through the material.

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"Glass Transition Temperature" or "Tg" refers to the temperature in Celsius at which the laminate begins to change between a hard, relatively brittle condition and a viscous, or rubbery, condition.

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"Lead-free" refers to laminates or prepreg that are suitable for lead-free soldering in the assembly of finished printed circuit boards. No laminates or prepreg actually contain the element lead. The distinction is important, however, as lead-free solders melt at higher temperatures than solders containing lead, which require laminates and prepreg capable of withstanding the stresses of a higher temperature environment.

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"Loss", in the context of a material's characteristics, refers to the ratio of energy dissipated to energy stored.

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"Prepreg" is an industry term derived from the contraction of "previously impregnated". Prepreg is a dielectric material that provides electrical insulation properties. It is manufactured, as the term suggests, by the impregnation of fabric with specially formulated resin systems that confer specific electrical, thermal and physical properties to the prepreg. While modern prepreg is generally made from fiberglass fabric, some simple consumer electronics still use prepreg made from paper or paper composite. Prepreg is both a final product and an intermediate-stage product in the manufacture of copper-clad laminate.

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Prospectus Summary

This summary highlights important information about our business and about this prospectus. This summary does not contain all of the information that may be important to you. You should carefully read this prospectus in its entirety before making an investment decision. In particular, you should read the section titled "Risk Factors" and the consolidated financial statements and notes related to those statements included elsewhere in this prospectus. Unless the context indicates otherwise, we use the terms "Isola", "we", "our", the "Company", and "us" in this prospectus to refer to Isola Group Ltd., and, where appropriate, its consolidated subsidiaries. Unless otherwise indicated, the information contained in this prospectus assumes the completion of the reorganization as described in this prospectus under "Concurrent Transactions" immediately prior to the consummation of this offering.

ISOLA GROUP LTD.

Overview

Isola is a leading global material sciences company that designs, develops and manufactures copper-clad laminate ("CCL") and prepreg (collectively, "laminate materials") used to fabricate advanced multilayer printed circuit boards ("PCBs"). PCBs provide the physical platform for the semiconductors, passive components and connection circuitry that power and control virtually all modern electronics. We focus on the market for high-performance laminate materials, developing proprietary resins that are critical to the performance of PCBs used in advanced electronic applications. We continually invest in research and development and believe that our industry-leading resin formulations, many of which are patented, provide us with a competitive advantage. With 11 manufacturing facilities and three research centers worldwide, as well as a global sales force, we are the largest supplier of laminate materials to PCB fabricators in the United States and Europe, and we are one of the larger suppliers in our addressable Asian market, based on revenue for fiscal year 2010.

Our high-performance PCB laminate materials are used in a variety of advanced electronics, including network and communications equipment and high-end consumer electronics, as well as advanced automotive, aerospace, military and medical applications. Demand in these markets is driven by the rapid growth of bandwidth-intensive high-speed data transmission, the expansion of the internet, the emergence of cloud computing and the evolution of increasingly complex communications technology. This has led to an urgent need for the development of the underlying infrastructure to support this growth, including faster and more efficient semiconductor technology. In addition, increasingly pervasive environmental regulations are driving a need for lead-free compatible, high-performance laminate materials.

We sell our products globally to leading PCB fabricators, including DDi, Ruwel, Sanmina, TTM Technologies, Viasystems and WUS Printed Circuit. These fabricators produce PCBs incorporating our laminate materials for electronic equipment designed or produced by a broad group of major original equipment manufacturers, or OEMs, including Alcatel-Lucent, Brocade, Cisco, Google, Hewlett-Packard, Huawei, IBM and Sun Microsystems (now Oracle). We work closely with these leading PCB fabricators and major OEMs to ensure that our high-performance laminate materials incorporating our proprietary resins meet the thermal, electrical and physical performance criteria of each new generation of electronic equipment.

We were acquired in 2004 by a group of investors led by TPG Capital, a global private equity firm, and Redfern Partners, a strategic partner and investor in the laminate materials industry. Under the direction of TPG Capital and our management, we have undertaken a number of operational changes that have increased manufacturing efficiencies and improved business processes. We believe that these measures, together with our focus on higher margin high-performance products, provide us with the operating leverage to take advantage of improving economic conditions.

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Our history dates back nearly 100 years to the founding of Isola Werke AG in Germany in 1912. Isola Werke AG manufactured insulators utilizing the then-revolutionary Bakelite plastic technology, which provided superior insulating and heat resistance properties. We began production of copper-clad epoxy laminates, the direct predecessors of today's PCB laminate products, in the 1960s. In 2006, we acquired the assets of Polyclad Laminates, Inc., which extended our product portfolio and expanded our business in the growing Asian markets.

For the nine months ended October 1, 2011, our revenue was $459.4 million, our net income was $7.1 million and our Adjusted EBITDA was $68.7 million, as compared to revenue of $464.7 million, a net loss of $40.8 million and Adjusted EBITDA of $73.9 million for the nine months ended September 25, 2010. For fiscal 2010, our revenue was $612.0 million, our net income was $1.2 million and our Adjusted EBITDA was $92.4 million, as compared to revenue of $424.2 million, a net loss of $100.7 million and Adjusted EBITDA of $31.7 million in fiscal 2009. For an understanding of our primary non-GAAP metric, Adjusted EBITDA, including reconciliation to net income, see our discussion of non-GAAP financial measures in "Selected Historical Consolidated Financial and Other Data", included elsewhere in this prospectus.

Industry Overview and Market Opportunity

Current trends and drivers in the PCB laminate materials industry include:

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rapidly expanding infrastructure requirements for high-speed data transmission and increasing demand for high-performance PCB laminate materials;

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increased performance requirements of advanced electronics requiring high-performance PCB laminate materials;

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growing demand for environmentally friendly, lead-free compatible laminate materials; and

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greater emphasis on collaboration with OEMs and PCB fabricators.

High-performance PCB laminate materials are defined by their superior performance capabilities achieved primarily through the use of advanced resin formulations. These products compete primarily on their technological capabilities and are used in circuit boards that combine eight or more layers, with some applications requiring circuit boards with more than 20 layers. Our high-performance laminate materials have a variety of applications in the markets for servers and storage devices, network communications, advanced automotive electronics, high-end consumer electronics, military/aerospace equipment, medical equipment and satellite television receivers.

Significant barriers to entry exist within the high-performance PCB laminate materials industry, including capital intensity, long-term customer relationships characterized by pre-production collaboration, and lengthy periods (often up to one year) taken by OEMs to qualify laminates for new products. Once a particular PCB laminate material is designed in or qualified for use in a specific product line and one or more particular laminate suppliers are selected, these suppliers tend to remain suppliers of choice, even as the PCBs for these products change to address OEM product line improvements, extensions or next generation developments.

Based on data from Prismark, an independent research firm, we estimate that our addressable market for high-performance PCB laminate materials was $4.6 billion in 2010. According to BPA, another independent research firm, the market for multilayer PCB laminate materials (predominantly comprised of the high-performance market segment) is expected to make up approximately 55% of the worldwide PCB laminate materials market in 2011 (measured in square meters) and remains the fastest growing segment with an expected compound annual growth rate, or CAGR, of 12.4% from 2010 to 2014.

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Our Competitive Strengths

We believe that we possess the following competitive strengths, which will enable us to continue to grow our business globally:

Product technology leadership.    Our significant technology expertise enables us to produce market-leading high-performance PCB laminate materials. We possess an extensive portfolio of patent and other intellectual property rights covering our proprietary resin formulations and we believe we have pioneered the development of several product categories with "best in class" technology. Our proprietary resin formulations are capable of supporting complex circuit boards used in the most demanding electronic equipment and differentiate our products from commonly available, lower-performance materials. We continue to devote considerable efforts to research and develop new resin formulations and other PCB laminate materials to meet evolving market needs.

Recognized market leadership.    We maintain a leading market share, based on revenues, in each of our larger addressable markets for high-performance PCB laminate materials. We have an established reputation as an industry leader and product innovator with strong brand recognition, which we believe will play a significant role in our future growth.

Blue-chip customer base served by global strategic manufacturing locations.    We have developed strong, long-term relationships with leading global PCB fabricators and the major OEMs they serve. We believe that these collaborative relationships provide us with a competitive advantage and assist us in bringing new products to market in a timely manner. We own state-of-the-art equipment in manufacturing facilities that are strategically located around the world in close proximity to these key industry participants. Our global network of plants facilitates quick-turn manufacturing and delivery of product, which reduces our customers' inventory levels and shipping costs.

Streamlined manufacturing with significant operating leverage.    We seek to achieve continual improvement in our manufacturing and business processes in order to improve quality and reduce costs. We use "six sigma" processes and "lean" best practices; we recently completed the implementation of a sophisticated SAP-based enterprise resource planning ("ERP") system across our global operations which has enhanced our production planning and inventory management capabilities on a worldwide basis. In 2009, we closed three of our manufacturing facilities to improve factory utilization in our remaining facilities, which lowered our fixed and semi-fixed manufacturing costs and improved our remaining manufacturing capacity utilization. Together with other measures, we estimate that these closures reduced our annual net costs by approximately $30.0 million (with approximately $15.0 million first realized in fiscal 2009 and approximately $15.0 million first realized in fiscal 2010).

Experienced management team.    We have a highly experienced management team comprised of well-respected industry veterans who possess an average of over 20 years of experience in the electronics industry. Our management team has a proven track record of implementing sound business practices, including focusing our product development on higher margin products, improving the efficiency of our manufacturing facilities and successfully integrating acquired businesses.

Our Growth Strategies

We intend to extend our market leadership in the higher margin, high-performance laminate materials market through the following growth strategies:

Leverage collaborative relationships and technology leadership to develop innovative solutions.    We have implemented focused product development teams to further expand our relationships with leading PCB fabricators and the OEMs they serve. Our product development teams include members of our research and development, technical support and OEM marketing groups, all working under the direction of our Chief Technology Officer. Our teams actively monitor OEM product developments and engage in regular dialog with OEMs and their PCB fabricators in order to anticipate and plan for future electrical, thermal and

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physical product specifications. Through this collaborative effort we seek to develop innovative laminate materials solutions that meet future OEM product requirements.

Further penetrate the Asian market.    Many OEMs and PCB fabricators are migrating manufacturing of increasingly complex electronic equipment to Asia. In addition, several Asian markets are simultaneously undergoing infrastructure build-outs as their economies grow and develop. To supply this market, six of our 11 manufacturing facilities are located in Asia, and we maintain a sales force dedicated to serving this region. We will seek to capitalize on the opportunities presented by the very large and fast growing Asian markets for high-performance laminate materials based on the high quality of our products and technology.

Extend high-performance products into new applications.    We believe that other markets will benefit from our laminate materials and proprietary resin formulations, including the markets for advanced automotive equipment and consumer devices such as next generation smart phones and tablets. In addition, we believe that environmental regulations will become increasingly global and expand the addressable market for our high-performance, lead-free compatible and halogen-free PCB laminate materials. We intend to devote sales and technical resources to address these growing potential markets.

Opportunistically pursue strategic acquisitions and alliances.    We have grown through select acquisitions since we were acquired in 2004. While we believe that our future success will depend primarily on product innovation from collaborative relationships with our major customers and the OEMs they serve, we may pursue strategic acquisitions that provide complementary products or technologies.

Risk Factors

An investment in our ordinary shares involves risks. For a discussion of factors you should consider before deciding to invest in our ordinary shares, we refer you to "Risk Factors" and the following summary:

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the markets for our customers' products are volatile, which can cause wide swings in the demand for our products;

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we depend upon a relatively small number of customers for a large portion of our sales, and a decline in sales to major customers could harm our results of operations;

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we sell on a purchase order basis and are subject to uncertainties and variability in demand by our customers that could decrease revenues and harm our results of operations;

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we depend on a small number of suppliers for the raw materials and certain components used to manufacture our products. If these suppliers fail to provide an adequate supply of raw materials or components of sufficient quality, or these suppliers become unavailable to us, we may experience significant delays in the manufacturing and shipping of our products to customers and our business could suffer;

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we face intense competition in the PCB materials industry, including from diversified manufacturers and suppliers, which could negatively impact our results of operations and cause our market share to decline;

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if demand for high-performance, higher margin products does not increase, our future gross margins and operating results may be worse than expected; and

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our failure to respond timely or adequately to market changes may render our existing technology less competitive or obsolete, and our operating results may suffer.

The Principal Sponsors

Our current principal sponsors (the "Principal Sponsors") are:

TPG Capital.    TPG Capital, L.P. (together with its affiliates, "TPG Capital") is the global buyout group of TPG, a leading private investment firm founded in 1992 with approximately $48 billion of assets under

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management as of June 30, 2011 and offices in San Francisco, Beijing, Fort Worth, Hong Kong, London, Luxembourg, Melbourne, Moscow, Mumbai, New York, Paris, Shanghai, Singapore and Tokyo. TPG Capital has extensive experience with global public and private investments executed through leveraged buyouts, recapitalizations, spinouts, growth investments, joint ventures and restructurings. TPG Capital's investments span a variety of industries including financial services, travel and entertainment, technology, industrials, retail, consumer, media and communications, and healthcare.

Oaktree.    Oaktree Capital Management, L.P. (together with its affiliates, "Oaktree") is a premier global alternative and non-traditional investment manager with approximately $80 billion of assets under management as of June 30, 2011. The firm emphasizes an opportunistic, value-oriented and risk-controlled approach to investments in distressed debt, high-yield bonds, convertible securities, senior loans, corporate control, real estate, emerging market equities and mezzanine finance. Oaktree was founded in 1995 by a group of principals who have worked together since the mid-1980s. Headquartered in Los Angeles, the firm has over 600 staff members and offices in 13 cities worldwide.

Concurrent Transactions

Corporate Reorganization

Currently, we operate through Isola Group S.a.r.l., a holding company incorporated in Luxembourg (the "Luxembourg Holding Company"), a low-tax jurisdiction. The Luxembourg Holding Company is owned by investors that include TPG Capital, Oaktree, Clearlake Capital and its affiliates, Tennenbaum Capital and its affiliates, The Blackstone Group LP and its affiliates, Redfern Partners, LLC and its affiliates and certain members of our management (collectively, the "Sponsors"). The Sponsors hold their investment in the Luxembourg Holding Company through two parent entities: TPG Hattrick Partners, L.P. (the "Sponsor Limited Partnership") and TPG Hattrick Holdco, LLC (the "Sponsor Holding Company"). The Sponsor Holding Company is the general partner of the Sponsor Limited Partnership.

The Sponsor Limited Partnership currently owns all of the issued and outstanding securities of the Luxembourg Holding Company, including 500 common shares and three classes of convertible preferred certificates (420,455 Class A convertible preferred certificates, 95,788,400 Class B convertible preferred certificates and 43,500,666 Class C convertible preferred certificates) that are accounted for as debt.

In preparation for our initial public offering, the Sponsor Limited Partnership recently formed a new company in the Cayman Islands, a tax-exempt jurisdiction, called Isola Group Ltd. Immediately prior to the completion of our initial public offering, we will undergo a corporate reorganization that includes the following steps:

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all of the outstanding securities of the Luxembourg Holding Company, including the common shares and convertible preferred certificates described above, will be contributed by the Sponsor Limited Partnership to Isola Group Ltd., which will result in Isola Group Ltd. becoming our new holding company and the Luxembourg Holding Company becoming a subsidiary of Isola Group Ltd.;

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both the Sponsor Limited Partnership and the Sponsor Holding Company will be liquidated and the ordinary shares of Isola Group Ltd. will be distributed to our Sponsors; and

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all outstanding management equity awards in the Sponsor Limited Partnership and the Sponsor Holding Company will be terminated and replaced with new equity awards for ordinary shares of Isola Group Ltd. that have the same value and substantially the same terms.

At the completion of our initial public offering:

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Isola Group Ltd. will be a public company;

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assuming the underwriters do not exercise their over-allotment option, the Principal Sponsors will together own approximately         % of our outstanding ordinary shares, investors in our initial public

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offering will own approximately         % of our outstanding ordinary shares and there will be options outstanding to purchase approximately         % of our outstanding ordinary shares; and

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the Sponsors and Isola Group Ltd. will enter into a shareholders agreement that provides for certain board representation rights and registration rights with respect to their ordinary shares.

Refinancing

In connection with this offering, we intend to enter into a new senior secured credit facility consisting of a $              million senior secured term loan and a $              million senior secured revolving credit facility. The proceeds of the new term loan will be used to repay the outstanding balances under the existing senior secured credit agreement and mezzanine credit agreement that are not repaid from the proceeds of this offering. We expect the new senior secured credit facility to be completed concurrently with the closing of this offering. Our entry into the new senior secured credit facility is conditioned on the completion of this offering. See "Description of Indebtedness".

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Corporate Information about Isola Group Ltd.

Isola Group Ltd. was incorporated under the laws of the Cayman Islands on September 20, 2011. Our principal executive offices are located at 3100 W. Ray Road, Suite 301, Chandler, Arizona 85226. The telephone number of our principal executive offices is (480) 893-6527, and we maintain a website at www.isola-group.com. The information on, or that can be accessed through, our website is not part of this prospectus.

The Offering

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The number of ordinary shares to be outstanding immediately after this offering as set forth above is based on the number of ordinary shares outstanding at                            , 2012, and excludes an aggregate of                  additional ordinary shares that will be available for future awards pursuant to our 2012 Equity Incentive Plan.

Unless otherwise indicated, all information in this prospectus assumes no exercise of the underwriters' option to purchase additional ordinary shares from us.

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Summary Historical Consolidated Financial and Other Data

The following table presents our summary historical consolidated financial and other data. The consolidated statements of operations data and other financial data for fiscal 2010, 2009 and 2008, and the consolidated balance sheet data as of the end of fiscal 2010, are derived from our audited consolidated financial statements which are included elsewhere in this prospectus. The consolidated statements of operations and other financial data for the nine months ended October 1, 2011 and September 25, 2010, and the consolidated balance sheet data as of October 1, 2011, are derived from our unaudited interim financial statements for those periods included elsewhere in this prospectus. These unaudited interim financial statements have been prepared on a basis consistent with the respective audited consolidated financial statements and, in the opinion of management, include all adjustments, consisting of normal, recurring adjustments, necessary for a fair presentation of that information for such periods. The financial data presented for the interim periods are not necessarily indicative of the results for the full year.

The summary historical financial data below should be read in conjunction with "Use of Proceeds", "Capitalization", "Selected Historical Consolidated Financial and Other Data", and "Management's Discussion and Analysis of Financial Condition and Results of Operations" and the consolidated financial statements and related notes included elsewhere in this prospectus.

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Risk Factors

An investment in our ordinary shares involves a high degree of risk. You should carefully consider the following information, together with other information in this prospectus, before buying our ordinary shares. If any of the following risks or uncertainties occur, our business, results of operations and financial condition could be materially adversely affected. In that case, the trading price of our ordinary shares could decline, and you may lose all or a part of the money you paid to buy our ordinary shares.

RISKS RELATED TO OUR INDUSTRY AND BUSINESS

The markets for our customers' products are volatile, which can cause wide swings in the demand for our products.

Our business depends on the electronics industry, which is cyclical and subject to significant downturns characterized by diminished product demand, rapid declines in average selling prices and over-capacity. This industry has experienced periods characterized by relatively low demand and price depression and is likely to experience recessionary periods in the future. Economic conditions affecting the electronics industry in general, or specific market segments, such as computers and communications, have adversely affected our operating results in the past and may do so in the future.

Over the past three years, the global economy has been greatly impacted by the recessionary conditions linked to rising default levels in the U.S. home mortgage sector, volatile fuel prices, and a changing political and economic landscape. These factors have contributed to historically low consumer confidence levels, resulting in a significantly intensified downturn in demand for products incorporating PCBs, which in turn lowered demand for our products and adversely affected our operating results. When we experience excess capacity, variable margins from our revenues may not fully cover our fixed overhead expenses, and our gross margins may fall. A lasting economic recession, excess manufacturing capacity, or a prolonged decline in the electronics industry could negatively affect our business, results of operations, and financial condition.

In order to respond to quick-turn orders and offer short lead times at some of our production facilities, in some cases as little as 12-48 hours, these facilities must operate at less than full capacity. However, if we do not receive as many quick-turn orders as we expect at these facilities and have foregone other production, we may underutilize our manufacturing capacity.

We depend upon a relatively small number of customers for a large portion of our sales, and a decline in sales to major customers could harm our results of operations.

A small number of customers, which include PCB manufacturers and distributors, are responsible for a significant portion of our sales. Our ten largest customers accounted for approximately 58% of our revenues in both fiscal 2010 and the nine months ended October 1, 2011. Our single largest customer (Viasystems) accounted for approximately 13% of our revenue in fiscal 2010 and approximately 14% for the nine months ended October 1, 2011. Although we cannot assure you that our principal customers will continue to purchase our products at past levels, we expect to continue to depend upon a relatively small number of customers for a significant portion of our sales. Our customer concentration could fluctuate, depending on future customer requirements, which will depend in large part on conditions in the end-markets in which our customers operate. The loss of one or more significant customers or a decline in sales to our significant customers could harm our business, results of operations, and financial condition and lead to declines in the trading price of our ordinary shares.

In addition, during industry downturns, we may need to reduce prices and we may be unable to collect payments from our customers. There can be no assurance that key customers will not cancel orders, or that

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Risk Factors

they will continue to place orders with us in the future at the same levels as experienced by us in prior periods, or that they will be able to meet their payment obligations. This concentration of customers may materially and adversely affect our operating results due to the loss or cancellation of business from any of these key customers, significant changes in scheduled deliveries to any of these customers, or decreases in the prices of the products sold to any of these customers.

We sell on a purchase order basis and are subject to uncertainties and variability in demand by our customers that could decrease revenues and harm our operating results.

We sell to customers on a purchase order basis and not pursuant to long-term contracts. Customers may cancel their orders, reduce production quantities or delay production at any time for a number of reasons. Many of our customers have, over the past several years, experienced significant decreases in demand for their products and services. The uncertain economic conditions in the global economy and in several of the markets in which our customers operate have in the past prompted some of our customers to cancel orders, delay the delivery of some of the products that we manufacture or order fewer products than we previously anticipated. Consequently, our sales are subject to short-term variability in demand by our customers. In the past, we have been required to increase staffing and other expenses in order to meet the anticipated demand of our customers. The level and timing of orders placed by our customers may vary due to:

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changes in our customers' inventory levels;

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changes in customers' manufacturing strategies;

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demand fluctuations for our customers' products; and

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changes in new product introductions.

Future terminations, reductions, or delays in our customers' orders could harm our business, results of operations, and financial condition. Variability in demand from our customers may contribute to fluctuations in our quarterly results, which may make our revenues more difficult to accurately forecast.

We depend on a small number of suppliers for the raw materials and certain components used to manufacture our products. If these suppliers fail to provide an adequate supply of raw materials or components of sufficient quality, or these suppliers become unavailable to us, we may experience significant delays in the manufacturing and shipping of our products to customers and our business could suffer.

We depend on a small number of suppliers for the raw materials, including copper, resin and fiberglass, as well as certain components, used in the manufacture of our products. These suppliers must comply with Isola's stringent specifications and technical requirements. Our reliance on these suppliers involves significant risks and uncertainties, including whether they will provide an adequate supply of required raw materials or components of sufficient quality, will not increase prices for the raw materials or components and will perform their obligations on a timely basis. If we are unable to obtain raw materials or components from third-party suppliers in the quantities and of the quality that we require on a timely basis and at acceptable prices, we may not be able to deliver our products on a timely or cost-effective basis to our customers, which could cause customers to end their business with us, reduce our gross profit and seriously harm our business, results of operations and financial condition. Moreover, if any of our suppliers becomes financially unstable, we may have to find new suppliers. It may take several months to locate alternative suppliers, if required. We may experience significant delays in manufacturing and shipping our products to customers and incur additional development, manufacturing and other costs to establish alternative sources of supply if we lose any of these sources. We cannot predict if we will be able to obtain replacement raw materials and components within the time frames that we require at an affordable cost, or at all.

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There may be shortages of, or price fluctuations with respect to, raw materials or components, which would cause us to curtail our manufacturing or incur higher than expected costs.

We purchase the raw materials and certain components we use in producing our products, and we may be required to bear the risk of price fluctuations of raw materials or components. Shortages of raw materials and price fluctuations have occurred in the past and may occur in the future. Copper prices have been particularly volatile in the last four years, declining to less than $3,000 per ton in late 2008 and increasing to more than $10,000 per ton during the nine months ended October 1, 2011. Although historically we have been able to pass through a substantial portion of the raw material cost increases to our customers, we may not continue to be able to do so in the future if we experience significant supply disruptions or excess levels of industry capacity or due to other factors outside of our control, in which case our profitability could suffer. Our ability to pass through raw material price increases may be limited by the level of industry excess capacity, competitive practices and other regional-specific factors which are out of our control. In addition, if we experience a shortage of materials or components, we may not be able to produce products for our customers in a timely fashion.

In addition, the Dodd-Frank Act of 2010 requires the Commission to establish new annual disclosure and reporting requirements for public companies to report their use of "conflict minerals" originating from the Democratic Republic of Congo and its nine immediate neighbors. The Commission has not yet established the new requirements, but is expected to do so between January and June 2012. The current list of "conflict minerals" under the Dodd-Frank Act includes gold, tantalum, tin and tungsten (although additional minerals may be added in the future). To the best of our knowledge, the only metal which is added to our products is copper foil, which is not currently listed as a "conflict mineral." If any of the metals used in our products are classified as "conflict minerals" in the future, there may only be a limited pool of suppliers who provide conflict-free metals, and we cannot assure you that we will be able to obtain products in sufficient quantities or at competitive prices.

We are vulnerable to an increase in the cost of energy.

Our production processes require us to use substantial amounts of power. In the past several years, there has been a significant increase in global energy prices. Changes in the cost or availability of energy resources, including oil, gas and electricity, are beyond our control and could materially increase our cost of operations. We maintain only limited back-up power generation facilities at some of our manufacturing locations. In the event of a power shortage, we could be required to cease operations at an affected facility until power is restored. There can be no assurance that our facilities will avoid material utility-based interruptions, which could have a material effect on our results of operations and financial condition.

We may experience significant fluctuations in results of operations from period to period.

Our periodic results may vary significantly depending on various factors, many of which are beyond our control. These factors include:

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the volume of customer orders;

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changes in demand for customers' and OEMs' products;

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pricing and other competitive pressures;

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our effectiveness in managing manufacturing processes;

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changes in cost and availability of raw materials and labor;

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changes in our product mix;

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changes in political and economic conditions; and

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local factors and events that may affect our production volume, such as local holidays.

Our sales may, from time to time, shift from one period to the next, affecting anticipated results. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Results of Operations" for more information about our period to period results and the effect of these factors on them.

If demand for high-performance, higher margin products does not increase, our future gross margins and operating results may be worse than expected.

We typically earn lower gross margins on certain of our base, low-Tg products and higher gross margins on certain of our high-performance laminate materials. We experience continued pressure from customers to reduce prices, and competition remains intense, particularly in Asia. This pricing pressure has affected, and could continue to adversely affect, our gross margins. If demand for our high-performance, higher margin products does not increase in the future, our gross margins and operating results may be worse than expected.

Our failure to respond timely or adequately to market changes may render our existing technology less competitive or obsolete, and our operating results may suffer.

The market for our products is characterized by continuing product development and changing technologies. The success of our business depends in part upon our ability to maintain and enhance our technological capabilities, develop and market products and services that meet changing customer needs and successfully anticipate or respond to technological product platform changes on a cost-effective and timely basis. There can be no assurance that we will effectively respond to the technological product requirements of the changing market, including having sufficient cash flow to make additional capital expenditures that may be required as a result of those changes. To the extent we are unable to respond to such technological product requirements, our operating results may suffer.

Our customers require our products to undergo a lengthy and expensive qualification process which does not assure follow-on product sales. If we are unsuccessful or delayed in qualifying any of our products with a customer, our business and operating results would suffer.

In general, OEMs require that our products undergo an extensive qualification process, which may involve testing of our products for performance and reliability. This qualification process may continue for several months or even up to one year in certain cases. Moreover, qualification of a product by a customer does not assure any sales of the product to that customer. After our products are qualified, it can take several months or more before the customer commences volume production of components or systems that incorporate our products. Despite these uncertainties, we devote substantial resources, including design, engineering, sales, marketing and management efforts, to qualifying our products with customers in anticipation of sales. If we are unsuccessful or delayed in qualifying any of our products with a customer, sales of those products to the customer may be precluded or delayed, which may impede our growth and cause our business to suffer.

In addition, we work closely with OEMs to develop products that are well suited to their changing needs. We will not recover the cost of this product development directly even if we are actually engaged as a supplier to an OEM's product line, and there can be no guarantee that such collaborations will result in any sales of our products to such OEM.

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Our products may contain design or manufacturing defects, which could result in reduced demand for our services and liability claims against us.

We manufacture products that are highly complex and need to meet increasingly demanding technical and quality requirements. These products may contain design or manufacturing errors or failures, despite our quality control and quality assurance efforts. Defects in the products we manufacture, whether caused by a design, manufacturing, or materials failure or error, may result in delayed shipments, customer dissatisfaction, a reduction or cancellation of purchase orders, or liability claims against us. If these defects occur frequently or in large quantities, our reputation may be impaired. Although our invoices and sales arrangements contain provisions designed to limit our exposure to product liability and related claims, existing or future laws or unfavorable judicial decisions could negate these provisions. Product liability litigation against us, even if it were unsuccessful, would be time-consuming and costly to defend. We may not maintain technology errors and omissions insurance at any given time for all or certain of our operations, and we may not be able to purchase such insurance coverage in the future on terms that are satisfactory to us, if at all. Moreover, such coverage may not be sufficient to cover actual losses.

We face intense competition in the PCB materials industry, including from diversified manufacturers and suppliers, which could negatively impact our results of operations and cause our market share to decline.

The PCB materials industry is intensely competitive, and we compete worldwide in the markets for such materials. Our principal competitors are substantially larger and have greater financial resources than us, and our operating results may be affected by our ability to maintain our competitive positions in these markets. Some of our competitors and potential competitors may have advantages over us, including:

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greater financial and manufacturing resources that can be devoted to the development, production, and sale of their products;

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more established and broader sales and marketing channels;

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manufacturing facilities that are located in countries with lower production costs;

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more manufacturing facilities worldwide, some of which are closer in proximity to PCB fabricators;

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lower capacity utilization, which in peak market conditions can result in shorter lead times to customers;

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ability to add additional capacity faster or more efficiently;

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preferred vendor status with existing and potential customers;

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greater name recognition; and

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larger customer bases.

In addition, these competitors may respond more quickly to new or emerging technologies, adapt more quickly to changes in customer requirements or devote greater resources to the development, promotion, and sale of their products than we do.

Consolidation trends among our customers could adversely affect our business.

In recent years, a number of our customers have consolidated and further consolidation of customers may continue. If an existing customer is not the controlling entity of the supply chain function following a consolidation, we may not be retained as a preferred or approved supplier. In addition, product duplication could result in the termination of a product line that we currently support. While there is potential for

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increasing our position with the combined customer, our revenues may decrease if we are not retained as a supplier. We may also be subject to increased pricing pressure from the combined customer because of its increased market share.

Our international sales and operations subject us to additional risks that could adversely affect our operating results.

We derive, and expect to continue to derive, a significant portion of our revenue from international sales in various Asian and European markets. Sales in non-U.S. markets accounted for approximately 84% of our total revenue in the nine months ended October 1, 2011 and approximately 81% of our total revenue in fiscal 2010. Moreover, we manufacture a significant portion of our products in manufacturing facilities outside of the United States. Our international revenue and operations are subject to a number of material risks, including, but not limited to:

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difficulties in staffing, managing and supporting operations in multiple countries;

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rising costs of labor in certain countries;

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difficulties in enforcing agreements and collecting receivables through foreign legal systems and other relevant legal issues;

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fewer legal protections for intellectual property;

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foreign and U.S. taxation issues and international trade barriers;

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difficulties in obtaining any necessary governmental authorizations for the export of our products to certain foreign jurisdictions;

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potential fluctuations in foreign economies;

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government currency control and restrictions on repatriation of earnings;

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fluctuations in the value of foreign currencies and interest rates;

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general economic and political conditions in the markets in which we operate;

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domestic and international economic or political changes, social unrest, hostilities and other disruptions in regions where we currently operate or may operate in the future; and

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different and changing legal and regulatory requirements in the jurisdictions in which we currently operate or may operate in the future.

Negative developments in any of these areas in one or more countries could result in a reduction in demand for our products, the cancellation or delay of orders already placed, threats to our intellectual property, difficulty in collecting receivables, and a higher cost of doing business, any of which could negatively impact our business, financial condition or results of operations. Moreover, our sales, including sales to customers outside the United States, are primarily denominated in U.S. dollars, and downward fluctuations in the value of foreign currencies relative to the U.S. dollar may make our products more expensive than other products, which could harm our business.

We operate in countries that have experienced political unrest or instability or government controls over the conduct of business, including China and countries in Southeast Asia. Recently, in China, labor disputes and strikes based partly on wages have slowed or stopped production at certain manufacturers. In some cases, employers have responded by significantly increasing the wages of workers at such plants. In addition, regulatory authorities and others have increased their scrutiny of labor conditions in countries in which we operate. To the extent such developments result in more burdensome labor laws and regulations or require

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us to increase the wages of employees, our ability to adequately staff our plants and the costs associated with the manufacture and shipping of our products in those jurisdictions could be adversely affected, which would have a material adverse effect on our business and operating results. For more information about how these factors affect our results of operation, see "Management's Discussion and Analysis of Financial Condition and Results of Operations—Results of Operations".

Our leverage and our debt service obligations may adversely affect our cash flow.

As of October 1, 2011, we had total indebtedness of approximately $545.1 million, and a stockholders' deficiency of $393.2 million. After giving effect to the application of the proceeds from this offering (at an assumed initial public offering price of $             per share, the midpoint of the range set forth on the cover of this prospectus) and the proceeds of the new term loan we expect to enter into at the closing of this offering, as set forth in "Use of Proceeds", we expect our total indebtedness to be $          million.

Our indebtedness and resulting financial leverage could have significant negative consequences, including:

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increasing our vulnerability to general adverse economic and industry conditions;

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requiring the use of a substantial portion of our cash flow from operations to service our indebtedness, thereby reducing the amount of cash flow available for other purposes, including capital expenditures;

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limiting our flexibility in planning for, or reacting to, changes in our business and the industry in which we compete; and

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placing us at a possible competitive disadvantage to less leveraged competitors and competitors that have better access to capital resources.

Our current credit agreements contain financial and operating covenants that limit our management's discretion with respect to certain business matters. Among other things, these covenants restrict our ability and our subsidiaries' ability to incur additional debt, create liens or other encumbrances, make investments, change the nature of our business, sell or otherwise dispose of assets and merge or consolidate with other entities. As of October 1, 2011, we were in compliance with these covenants. If we are not able to comply with all of these covenants, for any reason, some or all of our outstanding debt could become immediately due and payable.

If we fail to protect, or incur significant costs in defending, our intellectual property and other proprietary rights, our business and results of operations could be materially harmed.

Our success depends in part on our ability to protect our intellectual property and other proprietary rights. We rely primarily on patents, trademarks, copyrights, trade secrets and unfair competition laws to protect our intellectual property and other proprietary rights. Significant technology used in our products, however, is not the subject of any patent protection, and we may be unable to obtain patent protection on such technology in the future. Moreover, existing U.S. legal standards relating to the validity, enforceability and scope of protection of intellectual property rights offer only limited protection, may not provide us with any competitive advantages, and may be challenged by third parties. In addition, the laws of foreign countries in which we manufacture and market our products may afford little or no effective protection of our intellectual property. Accordingly, despite our efforts, we may be unable to prevent third parties from infringing upon or misappropriating our intellectual property or otherwise gaining access to our technology. In addition to the legal methods that we use to protect our intellectual property described above, we may elect to manufacture certain of our products in the United States, where manufacturing costs are higher, in order to better protect our intellectual property. Unauthorized third parties may try to copy or reverse engineer our products or portions of our products or otherwise obtain and use our intellectual property.

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This could result in third parties manufacturing and selling competitive products that employ our technologies. If we fail to protect our intellectual property and other proprietary rights, our business, results of operations or financial condition could be materially harmed.

In addition, defending our intellectual property rights may entail significant expense. We have, from time to time, resorted to legal proceedings to protect our intellectual property and may continue to do so in the future. Any of our intellectual property rights may be challenged by others or invalidated through administrative processes or litigation. If we resort to legal proceedings to enforce our intellectual property rights or to determine the validity and scope of the intellectual property or other proprietary rights of others, the proceedings could result in significant expense to us and divert the attention and efforts of our management and technical employees, even if we were to prevail. If unsuccessful, these efforts could also result in the limitation or invalidation of the intellectual property rights we sought to enforce. Finally, during the course of any patent litigation, there may be public announcements of the results of hearings, motions, and other interim proceedings or developments in the litigation. If securities analysts or investors regard these announcements as negative, the market price of our ordinary shares may decline. General proclamations or statements by key public figures may also have a negative impact on the perceived value of our intellectual property.

We may be subject to attempts by others to gain unauthorized access to our information technology systems, which could result in third-party claims and harm our business and results of operations.

We face attempts by others to gain unauthorized access through the Internet to our information technology systems. If successful, these attempts could harm the Company, its products, or its customers and end users. We seek to detect and investigate these security incidents and to prevent their occurrence, but in some cases we might be unaware of an incident or its magnitude and effects. The theft or unauthorized use or publication of our trade secrets and other confidential business information as a result of such an incident could adversely affect our competitive position and reduce marketplace acceptance of our products; the value of our investment in R&D, product development, and marketing could be reduced; and third parties might assert against us or our customers claims related to resulting losses of confidential or proprietary information or end-user data, or system reliability. Our business could be subject to significant disruption, and we could suffer monetary and other losses, including the cost of product recalls and returns and reputational harm, in the event of such incidents and claims.

We may be sued by third parties for alleged infringement of their proprietary rights, which could be costly, time-consuming to defend and limit our ability to use certain technologies in the future.

Because our competitors and others actively seek patent protections, we may in the future be subject to claims that our technologies infringe upon third parties' intellectual property or other proprietary rights. In addition, the vendors from which we license technology used in our products or our customers could become subject to similar infringement claims. Any claims, with or without merit, could be time-consuming and expensive to defend, and could divert our management's attention away from the execution of our business plan. Moreover, any settlement or adverse judgment resulting from the claim could require us to pay substantial amounts or obtain a license to continue to use the technology that is the subject of the claim, or otherwise restrict or prohibit our use of the technology. There can be no assurance that we would be able to obtain a license from the third party asserting the claim on commercially reasonable terms, or at all; that we would be able to develop alternative technology on a timely basis, if at all; or that we would be able to obtain a license to use a suitable alternative technology to permit us to continue offering, and our customers to continue using, our affected product. In addition, we may be required to indemnify our vendors or

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customers for third-party intellectual property infringement claims, which would increase the cost to us of an adverse ruling in such a claim. An adverse determination could also prevent us from offering our products to others. Infringement claims asserted against us or our vendors or customers may have a material adverse effect on our business, results of operations or financial condition.

Our confidentiality agreements with employees and others may not adequately prevent disclosure of trade secrets and other proprietary information.

We rely substantially upon proprietary information, trade secrets and know-how to conduct our manufacturing operations and research and development activities. We take steps to protect our proprietary rights and information, including the use of confidentiality and other agreements with our employees and consultants and in our commercial relationships, including with distributors and customers. However, these steps may be inadequate. Confidentiality agreements used in some of our commercial relationships expire after a stated term. Moreover, our confidentiality agreements may be violated, and there may be no adequate remedy available for any such violation. We cannot assure you that our proprietary information will be kept confidential or that we can meaningfully protect our trade secrets. Our competitors may independently develop substantially equivalent proprietary information or may otherwise gain access to our trade secrets, which could adversely affect our ability to compete in the market.

We depend on the experience and expertise of our senior management team and key technical employees, and the loss of any key employee may impair our ability to operate effectively.

Our success depends upon the continued services of our senior management team and key technical employees, particularly in our research and development department. Each of our executive officers, key technical personnel and other employees could terminate his or her relationship with us at any time. The loss of any member of our senior management team might significantly delay or prevent the achievement of our business objectives and could materially harm our business and customer relationships. In addition, because of the highly technical nature of our business, the loss of any significant number of our existing engineering and project management personnel could have a material adverse effect on our business and operating results.

Furthermore, our manufacturing process requires a skilled labor force. Although we are not generally dependent on any one employee or a small number of employees involved in our manufacturing process, we have in the past experienced periods of high employee turnover and may in the future experience significantly high employee turnover at our Asian facilities. If we are not able to replace these people with new employees with comparable capabilities, our operations could suffer as we may be unable to keep up with innovations in the industry or the demands of our customers. As a result, we may not be able to continue to compete effectively.

Unfavorable tax law changes, unfavorable government reviews of our tax returns, changes in our geographical earnings mix, or imposition of withholding taxes on repatriated earnings could adversely affect our effective tax rate and our operating results.

Our operations are subject to income and transaction taxes in the United States and other jurisdictions. A change in the tax laws in the jurisdictions in which we do business, including an increase in tax rates or an adverse change in the treatment of an item of income or expense, could result in a material increase in the amount of taxes we incur. In particular, proposals have been made to change certain U.S. tax laws relating to foreign entities with U.S. connections. Legislation has been proposed that would require treating certain foreign corporations as U.S. domestic corporations (and therefore taxable on all of their worldwide income)

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if the management and control of the foreign corporation occurs, directly or indirectly, primarily within the United States. In addition, the U.S. government has proposed various other changes to the U.S. international tax system, certain of which could adversely impact foreign-based multinational corporate groups, and increased enforcement of U.S. international tax laws. Although these U.S. tax law changes may not be enacted in their current forms, it is possible that these or other changes in the U.S. tax laws could significantly increase our U.S. income tax liability in the future.

We are subject to periodic audits or other reviews by tax authorities in the jurisdictions in which we conduct our activities. Audits can result in increased tax payments, penalties and interest, which would affect our results of operation and cash position.

Because we conduct operations in multiple jurisdictions, our effective tax rate is influenced by the amounts of income and expense attributed to each such jurisdiction. If such amounts were to change so as to increase the amounts of our net income subject to taxation in higher-tax jurisdictions, or if we were to commence operations in jurisdictions assessing relatively higher tax rates, our effective tax rate could be adversely affected.

In addition, we may determine that it is advisable from time to time to repatriate earnings from subsidiaries, under circumstances which could give rise to the imposition of potentially significant withholding taxes by the jurisdictions in which such amounts were earned, without our receiving the benefit of any offsetting tax credits, which also could adversely impact our effective tax rate.

We are subject to risks of currency fluctuations.

A portion of our cash and other current assets is held in currencies other than the U.S. dollar. As of the end of fiscal 2010, we had approximately $36.7 million of current assets held by subsidiaries with a functional currency other than the U.S. dollar. Changes in exchange rates among other currencies and the U.S. dollar will affect the value of these assets as translated to U.S. dollars in our balance sheet. To the extent that we ultimately decide to repatriate some portion of these funds to the United States, the actual value transferred could be impacted by movements in exchange rates. Any such type of movement could negatively impact the amount of cash available to fund operations or to repay debt. Significant inflation or disproportionate changes in foreign exchange rates could occur as a result of general economic conditions, acts of war or terrorism, changes in governmental monetary or tax policy, or changes in local interest rates. The impact of future exchange rate fluctuations between the U.S. dollar and other currencies cannot be predicted. To the extent that we may have outstanding indebtedness denominated in other currencies, the appreciation of other currencies against the U.S. dollar will have an adverse impact on our financial condition and results of operations.

Our failure to comply with the requirements of environmental laws could result in litigation, fines and revocation of permits necessary to our manufacturing processes.

Our operations are regulated under a number of international, federal, state, local, and foreign environmental and safety laws and regulations that govern, among other things, the discharge of hazardous materials into the air and water, as well as the handling, storage, and disposal of such materials. Because we use hazardous materials and generate hazardous wastes in our manufacturing processes, we may be subject to potential financial liability for costs associated with the investigation and remediation of our own sites, or sites at which we have arranged for the disposal of hazardous wastes, if such sites become contaminated. Even if we fully comply with applicable environmental laws and are not directly at fault for the contamination, we may still be liable.

Although in recent periods the Company has not incurred any material environmental costs, any material violations of environmental laws or failure to maintain required environmental permits could subject us to

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fines, penalties, and other sanctions, including the revocation of our effluent discharge permits, which could require us to cease or limit production at one or more of our facilities, and harm our business, results of operations, and financial condition. Even if we ultimately prevail, environmental lawsuits against us would be time consuming and costly to defend.

Environmental laws could become more stringent over time, imposing greater compliance costs and increasing risks and penalties associated with violation. We operate in environmentally sensitive locations, and we are subject to potentially conflicting and changing regulatory agendas of political, business, and environmental groups. We are increasingly required to certify compliance with various material content restrictions in our products based on laws of various jurisdictions or territories such as the Restriction of Hazardous Substances ("RoHS") and Registration, Evaluation, Authorization and Restriction of Chemicals ("REACH") directives in the European Union and China's RoHS legislation. In addition, our customers or the OEMs they supply may adopt more stringent environmental requirements for their products in response to political or social pressure. Changes or restrictions on discharge limits, emissions levels, material storage, handling or disposal or increasingly stringent certification requirements might require a high level of unplanned capital investment or facility or materials relocation. It is possible that environmental compliance costs and penalties from new or existing regulations may harm our business, results of operations, and financial condition. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Legal Proceedings".

Our business and operations could be adversely impacted by climate change initiatives.

Our manufacturing processes require that we purchase significant quantities of energy from third parties, which results in the generation of greenhouse gasses, either directly on-site or indirectly at electric utilities. Both domestic and international legislation to address climate change by reducing greenhouse gas emissions and establishing a price on carbon could create increases in energy costs and price volatility. Considerable international attention is now focused on development of an international policy framework to guide international action to address climate change. Proposed and existing legislative efforts to control or limit greenhouse gas emissions could affect our energy source and supply choices as well as increase the cost of energy and raw materials derived from sources that generate greenhouse gas emissions.

Damage to our manufacturing facilities due to fire, natural disaster, or other events could harm our financial results.

We have manufacturing facilities in the United States in Arizona, California and South Carolina. We also have manufacturing facilities in Germany, Italy, China, Singapore, Malaysia and Taiwan. The destruction or closure of any of our facilities for a significant period of time as a result of fire, explosion, blizzard, act of war or terrorism, flood, tornado, earthquake, lightning, or other natural disaster could harm us financially, increasing our costs of doing business and limiting our ability to deliver our products on a timely basis.

We may engage in future acquisitions or dispositions that could disrupt our business, cause dilution to our shareholders or adversely impact our financial condition and operating results.

In the future we may acquire companies or assets of companies or dispose of portions of our business in order to enhance our market position or strategic strengths. We are not currently a party to any agreements or commitments, and we have no understandings with respect to any such acquisitions or dispositions. We may not be able to find suitable acquisition candidates, and we may not be able to complete acquisitions or dispositions on favorable terms, if at all, even after devoting substantial resources to them. If we do complete acquisitions or dispositions, we cannot be sure that they will ultimately strengthen our competitive position or that they will not be viewed negatively by customers, financial markets, or investors. In addition,

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any acquisitions that we make could lead to difficulties in integrating personnel and operations from the acquired businesses and in retaining and motivating key personnel from these businesses. Acquisitions or dispositions may disrupt our ongoing operations, divert management from day-to-day responsibilities, increase our expenses, and adversely impact our operating results or financial condition. Future acquisitions may reduce our cash available for operations and other uses and could result in an increase in amortization expense related to finite-lived intangible assets acquired, potentially dilutive issuances of equity securities, or the incurrence of debt, any of which could adversely affect our financial condition and operating results.

We will incur significantly increased costs as a result of operating as a public company, and our management will be required to devote substantial time to new compliance initiatives.

We have never operated as a public company. As a public company, we will incur significant legal, accounting and other expenses that we did not incur as a private company. In preparation for our initial public offering, we have increased our personnel devoted to legal, accounting and human resources matters and have implemented additional procedures to improve compliance and effectiveness in these functional areas. In addition, the Sarbanes-Oxley Act of 2002, the Dodd-Frank Act of 2010, and rules subsequently implemented and yet to be implemented by the Securities and Exchange Commission and Nasdaq have imposed and will impose various new requirements on public companies, including requiring changes in corporate governance practices. Our management and other personnel will need to devote a substantial amount of time to these new compliance initiatives. Moreover, these rules and regulations will increase our legal and financial compliance costs and will make some activities more time-consuming and costly. For example, we expect these new rules and regulations to make it more difficult and more expensive for us to obtain director and officer liability insurance, and we may be required to incur substantial costs to maintain the same or similar coverage.

In addition, the Sarbanes-Oxley Act requires, among other things, that we maintain effective internal control over financial reporting and disclosure controls and procedures. In particular, we must perform system and process evaluation and testing of our internal control over financial reporting to allow management and our independent registered public accounting firm to report on the effectiveness of our internal control over financial reporting, as required by Section 404 of the Sarbanes-Oxley Act. Compliance will require us to increase our general and administrative expense in order to pay added compliance personnel, outside legal counsel and public accountants to assist us in, among other things, external reporting, instituting and monitoring a more comprehensive compliance function and board governance function, establishing and maintaining internal controls over financial reporting in accordance with Section 404 of the Sarbanes-Oxley Act, and preparing and distributing periodic public reports in compliance with our obligations under the U.S. federal securities laws. We currently do not have an internal audit group, and we will evaluate the need to hire additional accounting and financial staff with appropriate public company experience and technical accounting knowledge. Moreover, if we are not able to comply with the requirements of Section 404 in a timely manner, the market price of our stock could decline and we could be subject to sanctions or investigations by Nasdaq, the Securities and Exchange Commission or other regulatory authorities, which would require additional financial and management resources.

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We have identified a material weakness in our internal control over financial reporting. If we fail to develop or maintain an effective system of internal controls, we may not be able to accurately report our financial results or prevent fraud. As a result, current and potential shareholders could lose confidence in our financial reporting, which would harm our business and the trading price of our stock.

During the preparation of our consolidated financial statements for fiscal 2010 and as of and for the fiscal period ending October 1, 2011, we and our independent registered public accounting firm identified deficiencies in our internal control over financial reporting, as defined in the standards established by the Public Company Accounting Oversight Board. These internal control deficiencies resulted in material adjustments to our previously issued consolidated financial statements for fiscal 2004 through 2010, as well as to our unaudited condensed consolidated financial statements as of and for the fiscal period ending October 1, 2011 that were subsequently issued, and affected the periods covered by such statements. Management determined the control deficiencies constitute a material weakness in our internal control over financial reporting. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Internal Control Over Financial Reporting".

We are in the process of remediating the material weakness, but we have not yet been able to complete our remediation efforts. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Internal Control Over Financial Reporting". It will take additional time to design, implement and test the controls and procedures required to enable our management to conclude that our internal control over financial reporting is effective. We cannot at this time estimate how long it will take to complete our remediation efforts or the cost of those efforts. We cannot assure you that measures we plan to take will be effective in mitigating or preventing significant deficiencies or material weaknesses in our internal control over financial reporting. Any failure to maintain or implement required new or improved controls, or any difficulties we encounter in their implementation, could result in additional material weaknesses or cause us to fail to meet our periodic reporting obligations. Beginning with our Annual Report on Form 10-K for our 2013 fiscal year ending December 28, 2013 (to be filed in early 2014) when the SEC's rules under Section 404 of Sarbanes-Oxley become applicable to us, such a failure could also result in a conclusion that our internal controls over financial reporting were not effective. The existence of a material weakness could result in errors in our financial statements that could result in further restatements of our financial statements, cause us to fail to meet our reporting obligations and cause investors to lose confidence in our reported financial information, leading to a decline in the trading price of our stock.

We are subject to the Foreign Corrupt Practices Act ("FCPA"). A determination that we violated this act may affect our business and operations adversely.

We are subject to the regulations imposed by the FCPA, which generally prohibits companies that are publicly listed in the U.S. and their intermediaries from making improper payments to foreign officials for the purpose of obtaining or keeping business. In connection with our initial public offering, we are implementing policies and procedures to train our personnel in FCPA compliance matters. Any determination that we have violated the FCPA could have a material adverse effect on our financial position, operating results and cash flows.

RISKS RELATED TO THIS OFFERING AND OWNERSHIP OF OUR ORDINARY SHARES

We are controlled by the Sponsors, whose interests may not be aligned with yours.

Prior to the completion of this offering, the Sponsors own, directly or indirectly,         % of our outstanding ordinary shares. After giving effect to this offering, assuming an offering of                  ordinary shares, the Sponsors will control, directly or indirectly, approximately         % of our ordinary shares, assuming no

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exercise of the underwriters' option to purchase additional shares. In addition, at the completion of this offering, we will enter into a shareholders agreement with our Sponsors that will give each of TPG Capital and Oaktree the right to nominate representatives to our board of directors, and require all of our Sponsors to vote for the election of these nominees to our board of directors, so long as TPG Capital and Oaktree own specified percentages of our outstanding voting securities. See "Certain Relationships and Related Party Transactions—Agreements with Our Sponsors—Shareholders and Registration Rights Agreement". As a result, the Sponsors will continue to be able to control the election of our directors, determine our corporate and management policies and determine, without the consent of our other shareholders, the outcome of any corporate transaction or other matter submitted to our shareholders for approval, including potential mergers or acquisitions, asset sales and other significant corporate transactions. The Sponsors will also have sufficient voting power to amend our organizational documents. The interests of the Sponsors may not coincide with the interests of other holders of our ordinary shares.

Furthermore, each of the Sponsors is in the business of making investments in companies and may, from time to time, acquire and hold interests in businesses that compete directly or indirectly with us. The Sponsors may also pursue, for their own accounts, acquisition opportunities that may be complementary to our business, and as a result, those acquisition opportunities may not be available to us. Our memorandum and articles of association do not prohibit the Sponsors, or any of their respective officers, directors, agents, employees, shareholders, members, partners, affiliates and subsidiaries, or any of our directors, from acquiring an interest or expectancy in corporate opportunities, and do not impose upon such persons or entities any duty to disclose such potential corporate opportunities to us or refrain from competing with us, even if such opportunities are ones we or our subsidiaries might reasonably be deemed to have pursued or had the desire to pursue. Furthermore, such persons or entities may take such corporate opportunities for themselves or offer them to other persons or entities. Our Sponsors may also consider combining our operations with those of another company. So long as the Sponsors continue to own a significant amount of our outstanding ordinary shares, they will continue to be able to strongly influence or effectively control our decisions, including potential mergers or acquisitions, asset sales and other significant corporate transactions.

We will be a "controlled company" within the meaning of Nasdaq rules and, as a result, will qualify for and will rely on exemptions from certain corporate governance requirements.

After completion of this offering, the Sponsors will continue to control a majority of the voting power of our outstanding ordinary shares. As a result, we will be a "controlled company" within the meaning of the corporate governance standards of Nasdaq. Under Nasdaq rules, a company of which more than 50% of the voting power is held by a person or group of persons acting together is a "controlled company" and may elect not to comply with certain corporate governance requirements of Nasdaq, including the requirements that:

–>

a majority of the board of directors consist of independent directors;

–>

the nominating and corporate governance committee be composed entirely of independent directors with a written charter addressing the committee's purpose and responsibilities;

–>

the compensation committee be composed entirely of independent directors with a written charter addressing the committee's purpose and responsibilities; and

–>

there be an annual performance evaluation of the nominating and corporate governance and compensation committees.

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We have adopted charters for our audit, nominating and corporate governance and compensation committees, intend to conduct annual performance evaluations for these committees, and initially expect all of our committee members and a majority of our board of directors to be considered independent directors under the independence criteria of Nasdaq. Although we intend to comply with these listing requirements whether or not we are a controlled company, there is no guarantee that we will not take advantage of the exemptions available to "controlled companies" in the future. Accordingly, you may not have the same protections afforded to shareholders of companies that are subject to all of the corporate governance requirements of Nasdaq.

Shareholder rights under Cayman Islands law may differ materially from shareholder rights in the United States, which could adversely affect the ability of us and our shareholders to protect our and their interests.

We are a company incorporated under the laws of the Cayman Islands. Our corporate affairs are governed by our memorandum and articles of association, by the Companies Law (2010 Revision) of the Cayman Islands and the common law of the Cayman Islands. The rights of shareholders to take action against the directors, actions by minority shareholders and the fiduciary responsibilities of our directors to us under Cayman Islands law are to a large extent governed by the common law of the Cayman Islands. The common law in the Cayman Islands is derived in part from comparatively limited judicial precedent in the Cayman Islands as well as from English common law, the decisions of whose courts are of persuasive authority but are not binding on a court in the Cayman Islands. In particular, some states, such as Delaware, have more fully developed and judicially interpreted bodies of corporate laws. Moreover, we could be involved in a corporate combination in which dissenting shareholders would have no rights comparable to appraisal rights which would otherwise ordinarily be available to dissenting shareholders of United States corporations. Also, our Cayman Islands counsel is not aware of a significant number of reported class actions or derivative actions having been brought in Cayman Islands courts. Such actions are ordinarily available in respect of United States corporations in U.S. courts. Finally, Cayman Islands companies may not have standing to initiate shareholder derivative action before the federal courts of the United States. As a result, our public shareholders may face different considerations in protecting their interests in actions against the management, directors or the Sponsors than would shareholders of a corporation incorporated in a jurisdiction in the United States, and our ability to protect our interests may be limited if we are harmed in a manner that would otherwise enable us to sue in a United States federal court. See "Description of Share Capital—Differences in Corporate Law".

Certain provisions of our charter documents could discourage, delay or prevent a merger or acquisition at a premium price.

Our memorandum and articles of association will contain provisions that:

–>

permit us to issue, without any further vote or action by our shareholders, 25,000,000 preferred shares in one or more series and, with respect to each series, to fix the number of shares constituting the series and the designation of the series, the voting powers (if any) of the shares of such series, and the preferences and other special rights, if any, and any qualifications, limitations or restrictions, of the shares of the series; and

–>

at such time as we are no longer a "controlled company", will allow our board of directors to establish a classified board, and limit the ability of shareholders to call extraordinary general meetings or act by written consent in lieu of a meeting (we believe that such action by written consent would be impractical after the consummation of this offering, even while we are a "controlled company," because it requires unanimous shareholder approval under the laws of the Cayman Islands).

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The foregoing provisions may impose various impediments to the ability of a third party to acquire control of us, even if a change in control would be beneficial to our existing shareholders.

As a holder of the ordinary shares, you may have difficulty obtaining or enforcing a judgment against us because we are incorporated under the laws of the Cayman Islands.

Because we are a Cayman Islands company, there is uncertainty as to whether the Grand Court of the Cayman Islands would recognize or enforce judgments of United States courts obtained against us predicated upon the civil liability provisions of the securities laws of the United States or any state thereof, or be competent to hear original actions brought in the Cayman Islands against us predicated upon the securities laws of the United States or any state thereof.

An active trading market for our ordinary shares may not develop, and you may not be able to sell your ordinary shares at or above the initial public offering price.

Prior to this offering, there has been no public market for our ordinary shares. Although we have applied to have our ordinary shares quoted on the Nasdaq Global Market, an active trading market for our ordinary shares may never develop or be sustained following this offering. If no trading market develops, securities analysts may not initiate or maintain research coverage of our Company, which could further depress the market for our ordinary shares. As a result, investors may not be able to sell their ordinary shares at or above the initial public offering price or at the time that they would like to sell.

If equity research analysts do not publish research or reports about our business or if they issue unfavorable commentary or downgrade our ordinary shares, the price of our ordinary shares could decline.

The trading market for our ordinary shares will rely in part on the research and reports that equity research analysts publish about us and our business. We do not control these analysts. The price of our stock could decline if one or more equity analysts downgrade our stock or if those analysts issue other unfavorable commentary or cease publishing reports about us or our business.

The market price of our ordinary shares may be volatile, which could result in substantial losses for investors purchasing shares in this offering.

The initial public offering price for our ordinary shares will be determined through negotiations with the underwriters. This initial public offering price may vary from the market price of our ordinary shares after the offering. Some of the factors that may cause the market price of our ordinary shares to fluctuate include:

–>

the failure of securities analysts to cover our ordinary shares after this offering, or changes in financial estimates or recommendations by analysts;

–>

actual or anticipated variations in our or our competitors' operating results;

–>

failure by us or our competitors to meet analysts' projections or guidance that we or our competitors may give the market;

–>

volatility in our operating performance;

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future sales of our ordinary shares;

–>

investor perceptions of us and the industry;

–>

the public's reaction to our press releases, our other public announcements and our filings with the Securities and Exchange Commission;

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–>

general economic conditions; and

–>

the other factors described elsewhere in these "Risk Factors".

In addition, if the market for stocks of companies in our industry or the stock market in general experiences a loss of investor confidence, the trading price of our ordinary shares could decline for reasons unrelated to our business, financial condition or results of operations. If any of the foregoing occurs, it could cause our stock price to fall and may expose us to class action lawsuits that, even if unsuccessful, could be costly to defend and a distraction to management.

We may not be able to obtain capital when desired on favorable terms, if at all, or without dilution to our shareholders.

We anticipate that the net proceeds of this offering, together with current cash, cash equivalents, cash provided by operating activities and funds available from our new senior secured credit facility that we expect to enter into concurrent with this offering, including a $          million senior secured term loan with a $          million senior secured revolving credit facility, will be sufficient to meet our current and anticipated needs for general corporate purposes. It is possible, however, that we may not generate sufficient cash flow from operations or otherwise have the capital resources to meet our future capital needs, refinance our indebtedness or take advantage of acquisition opportunities. If this occurs, we may need additional financing to execute on our current or future business strategies, including to:

–>

hire additional engineers and other personnel;

–>

develop new or enhance existing products;

–>

enhance our operating infrastructure;

–>

acquire complementary businesses or technologies; or

–>

otherwise respond to competitive pressures.

If we raise additional funds through the issuance of convertible debt or equity securities, the percentage ownership of our shareholders could be significantly diluted, and these newly issued securities may have rights, preferences or privileges senior to those of existing shareholders, including those acquiring shares in this offering. We cannot assure you that additional financing will be available on terms favorable to us, or at all. If adequate funds are not available or are not available on acceptable terms, if and when needed, our ability to fund our operations, take advantage of unanticipated opportunities, develop or enhance our products, or otherwise respond to competitive pressures would be significantly limited.

A significant portion of our total outstanding shares may be sold into the public market in the near future, which could cause the market price of our ordinary shares to drop significantly, even if our business is doing well.

Sales of a substantial number of our ordinary shares in the public market could occur at any time after the expiration of the lock-up agreements described in "Underwriters". These sales, or the market perception that the holders of a large number of shares intend to sell shares, could reduce the market price of our ordinary shares. After this offering, we will have                  ordinary shares outstanding based on the number of shares outstanding as of                           , 2011. This includes the                  shares that we are selling in this offering, which may be resold in the public market immediately. The remaining                  shares, or         % of our outstanding shares after this offering, will be able to be sold, subject to any applicable volume limitations under U.S. federal securities laws, in the near future as set forth below.

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In addition, the Sponsors have certain registration rights, which they may exercise in order to sell their shares through a registration statement filed by us on their behalf. For more information, see "Certain Relationships and Related Party Transactions—Agreements with Our Sponsors—Shareholders and Registration Rights Agreement".

We plan to offer stock awards, which have the potential to dilute shareholder value and cause the price of our ordinary shares to decline.

We expect to offer stock awards to our directors, officers and employees, some of which may be vested at the time of this offering. If the stock awards are vested and exercised, and those shares are sold into the public market, the market price of our ordinary shares may decline. In addition, the availability of ordinary shares for award under any equity incentive plan that we adopt, or the grant of stock awards, may adversely affect the market price of our ordinary shares.

If you purchase ordinary shares sold in this offering, you will experience immediate and substantial dilution because our existing holders of ordinary shares paid substantially less than the initial public offering price for your shares.

You will experience immediate and substantial dilution of $         in pro forma net tangible book value per share because the price that you pay will be substantially greater than the net tangible book value per share of the shares you acquire, based on the net tangible book value per share as of                           , 2011. This dilution is due in large part to the fact that our earlier investors paid substantially less than the initial public offering price when they purchased their shares.

We do not currently intend to pay dividends on our ordinary shares and, consequently, your ability to achieve a return on your investment will depend on appreciation in the price of our ordinary shares.

Isola Group Ltd. has never declared or paid any cash dividends on its ordinary shares. We currently intend to invest our future earnings, if any, to fund our growth and do not anticipate paying cash dividends on our ordinary shares in the future. In addition, the instruments currently governing our indebtedness contain covenants that place limitations on the amount of dividends we may pay. Therefore, you are not likely to receive any dividends on your ordinary shares for the foreseeable future.

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Forward-looking Statements

This prospectus contains "forward-looking statements". All statements other than statements of historical fact are "forward-looking" statements for purposes of the U.S. federal and state securities laws. These statements may be identified by the use of forward-looking terminology such as "anticipate", "believe", "continue", "could", "estimate", "expect", "intend", "may", "might", "plan", "potential", "predict", "should" or "will" or the negative thereof or other variations thereon or comparable terminology. In particular, statements about our expectations, beliefs, plans, objectives, assumptions or future events or performance contained in this prospectus under the headings "Prospectus Summary", "Risk Factors", "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Business" are forward-looking statements.

We have based these forward-looking statements on our current expectations, assumptions, estimates and projections. While we believe these expectations, assumptions, estimates and projections are reasonable, such forward-looking statements are only predictions and involve known and unknown risks and uncertainties, many of which are beyond our control. These and other important factors, including those discussed in this prospectus under the headings "Prospectus Summary", "Risk Factors", "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Business", may cause our actual results, performance or achievements to differ materially from any future results, performance or achievements expressed or implied by these forward-looking statements. Some of the key factors that could cause actual results to differ from our expectations include:

–>

adverse developments in the global economy;

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our dependence on growth in our customers' businesses;

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our ability to remain competitive in the markets we serve;

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our inability to continue to develop, manufacture and market innovative, customized products and services that meet customers' requirements for performance and reliability;

–>

any failure of our suppliers to provide us with raw materials;

–>

termination of our key contracts, including technology license agreements, or loss of our key customers;

–>

our inability to protect our intellectual property;

–>

our failure to realize anticipated benefits from completed acquisitions, divestitures or restructurings, or the possibility that such acquisitions, divestitures or restructurings could adversely affect us;

–>

the loss of key employees;

–>

our exposure to foreign currency exchange rate risks;

–>

terrorist acts or acts of war; and

–>

other risks and uncertainties, including those listed under the caption "Risk Factors".

Given these risks and uncertainties, you are cautioned not to place undue reliance on such forward-looking statements. The forward-looking statements included in this prospectus are made only as of the date hereof. We undertake no obligation to update or revise any forward-looking statements, either to reflect new developments, or for any other reason, except as required by law.

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Use of Proceeds

We estimate that our net proceeds from this offering, after deducting underwriting discounts and estimated offering expenses, will be approximately $              million, assuming the shares are offered at $             per ordinary share, which is the midpoint of the estimated offering range set forth on the cover page of this prospectus.

We intend to use the net proceeds as follows:

–>

$              million of the net proceeds will be used to prepay $              million in aggregate principal amount of indebtedness under our existing senior secured credit agreement, at a redemption price of 100% plus interest to the prepayment date; and

–>

$              million of the net proceeds will be used to prepay $              million in aggregate principal amount of indebtedness under our mezzanine credit agreement, at a redemption price of 100% plus interest to the prepayment date.

As of October 1, 2011, we had $210.0 million aggregate principal amount of secured term loans outstanding under our senior credit agreement which currently bear interest at a rate of 10% per annum and mature on September 30, 2015, and $189.4 million aggregate principal amount of unsecured loans outstanding under our mezzanine credit agreement which currently bear interest at a rate of 16% per annum and mature on March 24, 2016. The syndicate of lenders under our existing senior secured credit agreement and mezzanine agreement includes certain of our Sponsors. See "Certain Relationships and Related Party Transactions".

After application of the proceeds of this offering, the remaining balances of the loans under the senior and mezzanine credit agreements will be repaid with borrowings under a new senior secured credit facility, which we intend to enter into concurrently with the completion of this offering.

The following table summarizes the estimated sources and uses of proceeds in connection with the sale of ordinary shares by us and borrowings under our new senior secured credit facility consisting of a $              million senior secured term loan and a $          million senior secured revolving credit facility, assuming this offering and the refinancing had occurred on October 1, 2011. You should read the following together with the information set forth under "Prospectus Summary—Concurrent Transactions".

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Dilution

Dilution represents the difference between the amount per share paid by investors in this offering and the as adjusted net tangible book value per share of our ordinary shares immediately after this offering.

Our net tangible book value as of                           , 2012 was a surplus of $              million, or $             per ordinary share. Net tangible book value per share represents the amount of our total tangible assets less total liabilities, divided by the number of ordinary shares outstanding.

After giving effect to our receipt of the estimated net proceeds from our sale of ordinary shares in this offering, and after deducting the underwriting discounts and commissions and other estimated offering expenses payable by us, our net tangible book value, as adjusted, as of                           , 2012 would have been $              million, or $             per ordinary share. This represents an immediate increase in net tangible book value of $             per common share to our existing shareholders and an immediate dilution of $             per share to new investors purchasing our ordinary shares in this offering. The following table illustrates this per share dilution to the later investors:

The following table summarizes, as of                           , 2012, the number of shares purchased from us, the total consideration paid or to be paid to us, and the average price per share paid or to be paid to us by existing shareholders and new investors purchasing our ordinary shares in this offering at an assumed offering price of $             per share, which is the midpoint of the price range listed on the cover page of this prospectus, before deducting underwriting discounts and commissions and estimated offering expenses payable by us. As the table shows, new investors purchasing shares in this offering will pay an average price per share substantially higher than our existing shareholders paid.

A $1.00 increase (decrease) in the assumed initial public offering price of $             per share would increase (decrease) the total consideration paid by new investors by $              million and increase (decrease) the percent of total consideration paid by new investors by         % assuming that the number of shares offered by us, as set forth on the cover of this prospectus, remains the same.

The number of ordinary shares to be outstanding after this offering is based on                           ordinary shares outstanding as of                           , 2012. Except as otherwise indicated, the discussion and tables above assume no exercise of the underwriters' option to purchase additional shares, and no exercise of any of our outstanding stock awards. If the underwriters' option to purchase additional shares is exercised in full, the number of ordinary shares held by existing shareholders upon the completion of this offering would

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be                  , or         %, and the number of ordinary shares held by new investors upon the completion of this offering would be                  , or         %, of the total number of shares outstanding upon the completion of this offering. Our net tangible book value, as adjusted, will be $                  , or $         per ordinary share, and the dilution per ordinary share to new investors will be $                  , if the underwriters' over-allotment option is exercised in full.

In addition, effective immediately upon the signing of the underwriting agreement for this offering, an aggregate of                           of our ordinary shares will be reserved for issuance under our 2012 Equity Incentive Plan. To the extent that any of our outstanding stock awards are exercised, new options are issued under our 2012 Equity Incentive Plan or we issue additional ordinary shares or other equity securities in the future, there will be further dilution to investors participating in this offering. Furthermore, we may choose to raise additional capital through the sale of equity or convertible debt securities due to market conditions or strategic considerations even if we believe we have sufficient funds for our current or future operating plans.

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Dividend Policy

Isola Group Ltd. has never declared or paid any cash dividends on its ordinary shares. We currently intend to retain earnings, if any, to finance the development and growth of our business and do not anticipate paying cash dividends on our ordinary shares in the future. Our payment of any future dividends is restricted by our current credit agreements. The declaration and payment of dividends also is subject to the discretion of our board of directors and depends on various factors, including our net income, financial condition, cash requirements, future prospects and other factors deemed relevant by our board of directors.

In addition, under the Companies Law of the Cayman Islands, our board of directors may declare dividends only out of our accumulated net profits, out of share premium, provided that immediately following the date on which the dividend is to be paid we can pay our debts as they come due in the ordinary course of business, or (subject to the same solvency test as applies to payments from premium) out of any distributable capital reserve resulting from contributed surplus paid in to us.

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Capitalization

Prior to this offering, a substantial amount of the investment in Isola is represented by convertible preferred certificates issued by Isola's current Luxembourg Holding Company to the Sponsor Limited Partnership, which is controlled by our Sponsors. Immediately prior to this offering, we will reorganize as Isola Group Ltd., a Cayman Islands company, and all of the outstanding securities of the Luxembourg Holding Company, including the common shares and these convertible preferred certificates, will be effectively converted into ordinary shares of Isola Group Ltd., as described in "Concurrent Transactions—Corporate Reorganization" (the "Corporate Reorganization and Conversion").

The following table sets forth both our cash and cash equivalents and our capitalization as of October 1, 2011:

–>

on an actual basis;

–>

on a pro forma basis to give effect to the Corporate Reorganization and Conversion;

–>

on a pro forma as adjusted basis to give effect to:

–>

the Corporate Reorganization and Conversion;

–>

the sale of ordinary shares by us in this offering at an assumed initial public offering price of $             per share, the midpoint of the range set forth on the front cover page of this prospectus; and

–>

the application of the net proceeds of this offering and our new senior secured credit facility as described under "Use of Proceeds".

This table should be read in conjunction with our consolidated financial statements and accompanying notes thereto, "Use of Proceeds" and "Management's Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources" included elsewhere in this prospectus.

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Selected Historical Consolidated Financial and Other Data

The following table presents our selected historical consolidated financial and other data. The consolidated statements of operations data, balance sheet data and other financial data as of and for fiscal 2010, 2009, 2008, 2007 and 2006 are derived from our audited consolidated financial statements which, except for fiscal 2007 and 2006 and balance sheet data as of the end of fiscal 2008, are included elsewhere in this prospectus. The consolidated statements of operations data, balance sheet data and other financial data as of and for the nine months ended October 1, 2011 and September 25, 2010 are derived from our unaudited interim financial statements for those periods included elsewhere in this prospectus and have been prepared on a basis consistent with the respective audited consolidated financial statements and, in the opinion of management, include all adjustments, consisting of normal, recurring adjustments, necessary for a fair presentation of that information for such periods. The financial data presented for the interim periods is not necessarily indicative of the results for the full year. The selected historical consolidated financial and other data below should be read in conjunction with "Use of Proceeds", "Capitalization", "Management's Discussion and Analysis of Financial Condition and Results of Operations" and the consolidated financial statements and related notes included elsewhere in this prospectus.

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Selected Historical Consolidated Financial and Other Data

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Selected Historical Consolidated Financial and Other Data