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U. S. SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K

Commission file no. 1-7755

Summa Industries
(Exact name of registrant as specified in its charter)

21250 Hawthorne Boulevard, Suite 500, Torrance, California 90503
www.summaindustries.com
(Address of principal executive offices, including zip code)

Registrant's telephone number: (310) 792-7024

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

Common Stock, $.001 par value
(Title of class)

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

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

        The aggregate market value of registrant's Common Stock held by non-affiliates as of October 22, 2002, based upon the closing price of a share of the Common Stock on The Nasdaq National Market on that date, was $33,274,000. The number of shares of registrant's Common Stock outstanding as of October 22, 2002 was 4,422,644.

        DOCUMENTS INCORPORATED BY REFERENCE: Portions of registrant's Proxy Statement for the Annual Meeting of Stockholders to be held on January 8, 2003 to be filed with the Commission not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K are incorporated by reference in Part III hereof.

PART I

ITEM 1.    BUSINESS.

General

        Summa Industries ("Summa" or the "Company") was incorporated as Southern California Plastics Co. in the State of California in 1942 and subsequently reincorporated in the State of Delaware in 1998. Since 1946, Summa has been a publicly-owned corporation whose Common Stock is registered under Section 12(g) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and is currently traded on The Nasdaq National Market under the symbol "SUMX". Growth has been achieved by acquisition, development of new products and expansion of the Company's sales organization. Summa designs and manufactures injection-molded and formed plastic optical components for original equipment manufacturer ("OEM") customers in the lighting industry; molded plastic modular conveyor belt and chain for the food processing industry; plastic fittings, valves, filters and tubing for the agricultural irrigation industry; molded plastic coil forms ("bobbins") for use in transformers, motors, relays and switches; and other molded and extruded plastic components for diverse industries.

        The principal executive offices of the Company are located at 21250 Hawthorne Boulevard, Suite 500, Torrance, California 90503; its telephone number is (310) 792-7024; its facsimile number is (310) 792-7079; and its website is www.summaindustries.com.

Strategy

        Summa has a strategy of growth through acquisitions of profitable manufacturing companies with proprietary products or protected market niches, with the intent of expanding its operations by acquiring additional product offerings, enhancing gross profit margins, increasing combined sales so that general and administrative costs would constitute a smaller percentage of total revenues, enhancing overall profitability, and increasing the market value of Summa's Common Stock to provide liquidity and value for its stockholders by increasing the number of outstanding shares in the public float and the trading activity in the stock. In 1995, the Company refined the strategy to focus on manufacturers of plastic components for industrial and commercial markets. In general, Summa's corporate staff does not manage operations of acquired subsidiaries on an ongoing basis, but provides planning, financial and legal oversight, and financing; conducts the acquisition program and business development activities; and manages the investor relations, risk management and employee benefit programs. Corporate charges are assessed on a basis established annually, related to asset utilization by each operating subsidiary.

History of Acquisitions—Continuing Operations

        KVP Falcon Plastic Belting, Inc.    In July 1993, Summa acquired all of the outstanding capital stock of KVP Systems, Inc., a California corporation, renamed KVP Falcon Plastic Belting, Inc. in May 1998 after its acquisition of Falcon Belting, Inc. described below ("KVP"), which designs, manufactures and markets injection-molded plastic conveyor belting for the food processing industry. Belts which can operate on a curve were pioneered by KVP.

        LexaLite International Corporation.    In November 1996, Summa acquired all of the outstanding capital stock of LexaLite International Corporation, a Delaware corporation ("LexaLite"), which manufactures injection-molded plastic prismatic components for lighting fixtures.

        Calnetics Corporation.    In October 1997, Summa acquired all of the outstanding capital stock of Calnetics Corporation, a California corporation ("Calnetics"). The principal operating subsidiary of Calnetics was Agricultural Products, Inc., which manufactures plastic fittings, filters, tubing and accessories, primarily for agricultural irrigation.

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        Falcon Belting, Inc.    In May 1998, Summa acquired all of the outstanding capital stock of Falcon Belting, Inc., an Oklahoma corporation ("Falcon"), which manufactures modular plastic conveyor belting used in food processing industries. The operations of Falcon were consolidated with KVP.

        Canyon Mold.    In September 1998, Summa acquired substantially all of the assets of Canyon Mold, Inc., a California corporation ("Canyon"). The operations of Canyon were relocated to and integrated into the Company's molding facility in Corona, California. Canyon had provided tool design and manufacturing services almost exclusively for the Company.

        Plastron Industries, Inc.    In March 1999, Summa acquired substantially all of the assets of Plastron Industries, L.P. ("Plastron"), which manufactures molded plastic coil forms ("bobbins") for use in transformers, motors, relays and switches.

        Broadview Injection Molding, Inc.    In September 1999, Summa acquired substantially all of the assets of Broadview Injection Molding Co., Inc. ("Broadview"), which manufacturers molded plastic coil forms ("bobbins") for use in transformers, motors, relays and switches. The operations of Broadview were consolidated with Plastron.

        Yarbrough-Timco.    In May 2000, Summa acquired substantially all of the assets of Yarbrough-Timco ("Yarbrough"), which is a distributor and manufacturer of molded plastic coil forms ("bobbins") for use in transformers, motors, relays and switches. The operations of Yarbrough were consolidated with Plastron.

        Plastic Specialties, Inc.    In October 2000, Summa acquired all of the outstanding capital stock of Plastic Specialties, Inc. ("PSI"), which manufactures formed and extruded plastic components for lighting fixtures.

        Ram Belts & Chains.    In December 2000, Summa acquired substantially all of the assets of the Ram Belts & Chains division ("Ram") of Rainbow Industrial Products Corp., which manufactures injection molded plastic chain and conveyor belting for the food processing and beverage industries.

        Genesta.    In January 2002, Summa acquired substantially all of the assets of the Genesta Manufacturing division ("Genesta") of Pavaco Plastics, Inc. Genesta manufactures extruded sheet and profiles and thermoformed components for the lighting and other industries. The primary reasons for the acquisition were that the acquisition of Genesta increased the Company's North American market share, provided entrée to new markets, provided a low cost manufacturing location and provided other manufacturing cost and sales and distribution synergies.

        In evaluating future acquisitions, Summa will endeavor to identify target companies that manufacture plastic components which have a proprietary advantage because of patent protection, brand recognition, unique manufacturing processes or other comparable characteristics. It is anticipated that target companies typically will have been profitable in recent periods, particularly if the acquisition is to be made through the issuance of Summa Common Stock, so that the acquisition will not have an immediate dilutive effect on post-acquisition, consolidated earnings per share.

        Although the existing management of an acquired company typically would be retained to manage day to day operations, it is anticipated that the business of the acquired company could be expanded with the support of Summa's corporate staff. Any such expansion could place a significant strain on Summa's management and resources, require Summa to implement additional operating, marketing and financial controls, and necessitate that Summa hire additional personnel, which could have a significant adverse effect on Summa's operating results. It is also likely that any such acquisition would require Summa to raise additional capital to finance the acquisition or provide working capital to the acquired company. If this additional capital were raised through debt financings, Summa would incur substantial additional interest expense; sales of additional equity to raise the needed capital would dilute, on a

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pro-rata basis, the percentage ownership of all holders of Summa Common Stock. There can, however, be no assurance that sufficient financing will be available to Summa to continue its acquisition strategy on terms and conditions that are acceptable to Summa.

        Continued implementation of the Company's strategy will depend to a significant extent upon the ability of Summa's management to identify appropriate candidates for acquisition, negotiate deals acceptable to the Board of Directors and stockholders of the Company, obtain acceptable acquisition prices, and supervise the management of operating subsidiaries. There can be no assurance that the terms upon which a prospective company can be acquired will be favorable to Summa, or that Summa will not encounter unforeseen difficulties and liabilities in connection with any such acquisition.

Products

        Summa manufactures diverse plastic products in one segment. From fiscal 1999 to fiscal 2001, the Company reported results from two segments—"Engineered Polymer Components" and "Extruded Plastic Products," the principal difference being the channels of distribution. The business has evolved to the point where most sales are directly to OEM accounts, resulting in the reporting of only one segment in fiscal 2002 in accordance with generally accepted accounting principles. Segment reporting has therefor been discontinued with this Annual Report on Form 10-K, and prior period disclosures have been reclassified to conform with this presentation.

        Optical Components.    Summa's optical components include prismatic lenses, refractors and reflectors molded and thermoformed from clear plastic, which are used in commercial and industrial lighting fixtures and in other applications. Products are injection-molded from specially compounded lighting grade polycarbonate or acrylic, extruded from similar materials or thermoformed from sheet extruded by the Company. The principal advantages of Summa's injection-molded plastic components over more traditional glass or metal components are superior optical performance, lighter weight, and in certain instances, lower cost.

        Conveyor Components.    Summa's conveyor components include engineered plastic components which form conveyer belts and chains. The components in Summa's product line, many of which are patented, are constructed of non-toxic, non-corrosive plastic materials and are designed to be easily cleaned, meeting FDA-USDA requirements and specifications. The components do not require lubrication and thus offer the advantage of operation free from contaminants such as grease, oil and metal particles. Because these components are lightweight, they require less energy to operate than steel belts, and are quieter in operation and easier to service in place than metal belts.

        Winding Cores.    Summa's winding cores are thermoplastic and thermoset coil forms or "bobbins" used in the manufacture of magnetic devices including transformers, relays, switches, power supplies and small electro motors. These devices are utilized in controls, appliances, vehicles, telecommunications equipment and many other applications.

        Irrigation Components.    Summa's irrigation components include injection-molded fittings, valves, filters and accessories and extruded tubing for drip irrigation systems. The use of drip irrigation systems conserves water and allows more precise control of delivery of water and soluble nutrients to plants than is possible with spray, sprinkler or flood irrigation techniques.

        In addition, the Company molds components for diverse industrial and commercial markets.

Research and Development

        Summa invests significantly in the development of new products and manufacturing processes. Only direct costs associated with new tooling for products are capitalized. All other costs, including salaries and wages of employees involved in research and development, are expensed as incurred.

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Production

        Injection Molding.    Summa's principal manufacturing operation is injection molding of plastic parts. Some products are molded by third-party vendors. Injection molds and tools are made by Summa and outside vendors. Products are made on modern molding machines, which range from 28 to 1500 tons clamping force, using a wide variety of plastic resins.

        Thermoforming.    Summa vacuum forms and pressure forms products from sheet which it produces. Tooling for the forming process is produced by third-party vendors.

        Extrusion.    Summa extrudes plastic sheet, profiles and tubing. The Company's sheet and profile products are made of polycarbonate and acrylic, while the tubing is extruded from polyethylene and polyvinylchloride (PVC).

        In addition to injection molding, thermoforming and extrusion, Summa performs additional production operations including laser cutting, machining and welding of plastic parts, vacuum deposition, coating, assembly and testing. Summa operates on a just-in-time basis with many of its customers, and inventories are managed to minimal levels. Four of Summa's manufacturing plants are ISO registered.

Marketing and Distribution

        Summa manufactures plastic products and components which are generally sold to other manufacturers who incorporate Summa's materials and components in their products, and to businesses which incorporate the Company's products in systems assembled for their own use or for their customers' use. The Company generally considers its customers to be OEM's, "end users" and distributors. Most sales are made directly by employees of the Company, although Summa utilizes several independent manufacturers' representatives and certain sales are made through distribution channels. The Company distributes its products principally by truck through the use of independent freight carriers and, to a lesser extent, by air and sea transport.

        Summa's largest three customers accounted for 10.3%, 4.2% and 3.6% of sales in fiscal 2002. Summa's largest customer is Acuity Brands, Inc. The Company has several thousand active accounts including Fortune 1,000 and large privately held businesses.

Raw Materials

        Summa's principal raw material is pelletized plastic resin which is delivered in bulk by truck or in large boxes, typically weighing 1,000 pounds ("Gaylords"). The Company is a large user of resin and does not rely on any single vendor for more than 15% of its raw material. Every material used is available from several vendors. Primary resins used include polycarbonate, acrylic, polyethylene, polyvinylchloride, polypropylene, acetal and nylon. Principal vendors include AtoFina, Bayer, Cyro, Dow, Dupont, GE Plastics and Lucite, among others. The resins used by the Company are crude oil or natural gas derivatives and may be affected to some extent by the supply, demand and price trends in the petroleum industry. The Company did not incur any shortages or unavailability of raw materials during fiscal 2002. Prices were relatively stable in fiscal 2001 and 2002.

Backlog and Seasonality

        On August 31, 2002, Summa had a backlog of orders, believed to be firm, in the amount of $9,225,000, as compared to a backlog of $7,982,000 on August 31, 2001. The increase is primarily attributable to the inclusion of the backlog of operations acquired in fiscal 2002. The open order backlog is comprised of orders for components and tooling. Because the time between entering an order, shipping the product and recording a sale is typically shorter than one month, backlog levels are not a reliable indicator of future sales volume.

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        Summa's sales exhibit modest seasonality, principally for its irrigation components. Excluding the effects of economic cycles, growth and acquisitions, the Company expects sales, as a percentage of fiscal year's sales, to occur approximately as follows:

        Because a portion of overhead is fixed and, therefor, does not vary with sales volume, profit may vary from quarter to quarter with more volatility than sales volume.

Competitive Conditions

        The markets for the products currently manufactured and sold by Summa are characterized by extensive competition. Numerous companies currently offer competing products nationally and internationally, and in certain geographic areas the Company has competition from local manufacturers as well. It can be expected that additional competing products will be introduced by other companies in the future. Many existing and potential competitors have greater financial, marketing and research capabilities than Summa. Some of Summa's largest customers have the resources to internally manufacture products comparable to those currently purchased from Summa, and some of Summa's customers also compete with the Company in certain areas.

        Summa believes that its trade names and reputation are significant to its competitive position. In addition, Summa believes that price is a significant element of competition. However, factors such as engineering, performance, availability and reliability are considered in the purchasing process. The performance of Summa in the future will depend on the ability of its operating subsidiaries to develop and market new products that will gain customer acceptance and loyalty, as well as its ability to adapt its product offerings to meet changing pricing considerations and other market factors. The Company's operating performance would be adversely affected if its operating subsidiaries were to incur delays in developing new products or if such products did not gain market acceptance. There can be no assurance that existing or future products will be sufficiently successful to enable Summa's operating subsidiaries to effectively compete in their respective markets or, should new product offerings meet with significant customer acceptance, that one or more current or future competitors will not introduce products that render the Company's products noncompetitive.

Patents, Trademarks and Licenses

        The Company owns and licenses many domestic and foreign patents on products which it has developed or acquired that expire on dates ranging to 2019. In addition, several patent applications are currently in process. The extent to which patents provide a commercial advantage or inhibit the development of competing products varies. The expiration of certain patents could result in increased future competition. Summa also relies upon common law concepts of confidentiality and trade secrets, as well as economic barriers created by the required investments in tooling and technical personnel and the development of customer relationships, to protect its proprietary products. Summa also has domestic and foreign trade name and trademark registrations covering many of the names and logos which appear on its products which are helpful in enabling the Company to maintain its present competitive position.

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Environmental Matters

        The Company is subject to national and regional environmental laws, rules and regulations of the jurisdictions in which it operates and has operated facilities, including those governing air quality, water quality, soil quality and hazardous waste management and disposal. The Company does not anticipate that future expenditures for the compliance with such laws, rules and regulations will have a material effect on its capital expenditures or its financial condition or results of operations.

Employees

        At October 22, 2002, Summa had 773 employees, including five employees who comprise the Company's corporate staff. Approximately 40 of Summa's employees are covered by a collective bargaining agreement. The Company considers its relationship with its employees to be good.

Export Sales

        For information regarding Summa's export sales by geographic area for the past three fiscal years, see Note 13 in the "Notes to Consolidated Financial Statements" of the Company in this Annual Report on Form 10-K.

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ITEM 2.    PROPERTIES.

        The Company operates primarily at the following facilities:

        The Company's facilities are well-maintained, and well suited for its operations. The Company believes it has adequate capacity to meet foreseeable demand.

        In addition, the Company owns 63,000 square feet of factory and office space in Fullerton, California, and a 15,000 square foot office and warehouse facility in Charlevoix, Michigan, which are leased to unrelated parties. The Fullerton lease expires in July 2006 and the Charlevoix lease expires in June 2003. The Company has a 27,500 square foot manufacturing facility in Charlevoix, Michigan which is being held for sale.

ITEM 3.    LEGAL PROCEEDINGS.

        The Company encounters lawsuits from time to time in the ordinary course of business and, at August 31, 2002, the Company and/or its affiliates were parties to several civil lawsuits. Summa does not expect that the resolution of these lawsuits will have a material adverse impact on future results of operations or financial position. Certain lawsuits filed against the Company from time to time contain claims not covered by insurance, or seek damages in excess of policy limits, and such claims could be filed in the future. Any losses that Summa may suffer from such lawsuits, and the effect such litigation may have upon the reputation and marketability of Summa's products, could have a material adverse impact on the future results of operations, financial condition and/or prospects of the Company. See also "Business—Environmental Matters" above.

ITEM 4.    SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

        No matters were submitted during the fourth quarter of the fiscal year ended August 31, 2002 to a vote of Summa's stockholders, through solicitation of proxies or otherwise.

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PART II

ITEM 5.    MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS.

Recent Market Prices

        Summa's Common Stock is traded on The Nasdaq National Market under the symbol "SUMX." During the year ended August 31, 2002, the average weekly trading volume was approximately 42,000 shares. The stock markets have experienced extreme price and volume fluctuations during certain periods. These broad market fluctuations and other factors may adversely affect the market price of Summa's Common Stock for reasons unrelated to Summa's operating performance. The following table sets forth the high and low prices for a share of Summa's Common Stock on The Nasdaq National Market for the periods indicated.

        On October 22, 2002, the closing price on The Nasdaq National Market for a share of Summa Common Stock was $9.46.

Recent Issuances and Repurchases

        In December 2001 the Company issued and sold 5,000 shares of newly-authorized Series A Preferred Stock in a private sale made in reliance on the exemption from registration contained in Rule 506 promulgated under the Securities Act of 1933 by the Securities and Exchange Commission ("Rule 506") to an investment group for an aggregate purchase price of $5,000,000. The purpose of the issuance was to fund the acquisition of the Genesta Manufacturing division ("Genesta") of Pavaco Plastics Inc., an Ontario corporation ("Pavaco"), from Pavaco and to reduce outstanding debt and strengthen the Company's financial position. The holders of the Series A Preferred Stock are not entitled to dividends or to vote prior to conversion, but are entitled to a liquidation preference of $1,000 per share (subject to adjustment upon the occurrence of certain events as set forth in the Certificate of Designations for the Series A Preferred Stock (the "Certificate of Designations")). Shares of Series A Preferred Stock are convertible at any time at the request of the holder thereof into common stock of the Company at a ratio of one hundred and twenty five shares of common stock for each share of Series A Preferred Stock, or 625,000 shares in the aggregate, with such conversion ratio subject to adjustment upon the occurrence of certain events as set forth in the Certificate of Designations. At the option of the holder, the Series A Preferred Stock shall be redeemed by the Company at any time commencing on the third anniversary of the date of issuance and ending immediately prior to the fourth anniversary of the date of issuance at a price which equals a twelve percent annual increase over the original issuance price in cash, subject to adjustment upon the occurrence of certain events as set forth in the Certificate of Designations. At the option of the Company, the Series A Preferred Stock may be redeemed at any time commencing on the fourth anniversary of the date of issuance and ending immediately prior to the fifth anniversary of the date of issuance at a price which equals a twenty percent annual increase over the original issuance price in cash, subject to adjustment upon the occurrence of certain events as set forth in the Certificate of Designations. Unless earlier converted or redeemed, on the fifth anniversary of the date of issuance any Series A Preferred Stock outstanding shall be redeemed by the Company at the original issuance price, subject to adjustment upon the occurrence of certain events as set forth in the Certificate of Designations.

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        In connection with the acquisition of Genesta in January 2002, the Company issued 40,000 shares of the Company's unregistered common stock to Pavaco as partial consideration for the acquisition, with the right of the holder thereof to require the Company to repurchase such stock for $13.25 per share for a ninety day period commencing eighteen months from closing. This issuance was made in reliance on the exemption from registration contained in Rule 506. Subsequently, the Company repurchased the 40,000 shares from Pavaco at a discounted price of $11.25 per share in August 2002.

        In late fiscal 2002, the Board of Directors of the Company authorized the repurchase of up to $2.0 million worth of the Company's Common Stock in open market transactions on The Nasdaq National Market. As of August 31, 2002, no repurchases had been made thereunder. Any repurchases will be at the discretion of senior management and subject to market conditions, compliance with regulations and other factors. No minimum amount of repurchases is required and no time limit has been set. The Company intends to finance any repurchases from working capital.

Description of Securities

        The authorized capital stock of Summa consists of 10,000,000 shares of Common Stock, $.001 par value, and 5,000,000 shares of Preferred Stock, $.001 par value. As of August 31, 2002, 4,401,769 shares of the Company's Common Stock were issued and outstanding and 5,000 shares of Series A Preferred Stock were issued and outstanding. The number of holders of record of Summa's Common Stock as of August 31, 2002 was 290. In addition, based upon the number of copies of this Annual Report requested by intermediaries on behalf of their clients, Summa estimates that there are approximately 2,500 additional stockholders whose shares are held in "street name", including approximately 800 stockholders who own shares through the Summa Industries 401(k) Savings and Retirement Plan.

        Common Stock.    Holders of Common Stock are entitled to one vote per share on each matter submitted to a vote of the stockholders of Summa, and there is no cumulative voting for the election of directors. Subject to preferences applicable to the holders of outstanding Preferred Stock, each holder of Common Stock is entitled to receive ratably such dividends, if any, as may be declared by the Board of Directors out of funds legally available therefor. Upon the liquidation, dissolution or winding up of Summa, holders of Common Stock are entitled to share ratably in all assets of Summa which are legally available for distribution, after payment of all debts and other liabilities and the liquidation preference of outstanding Preferred Stock. Holders of Common Stock have no preemptive, subscription, redemption or conversion rights. The transfer agent and registrar for the Common Stock is U. S. Stock Transfer Corporation, 1745 Gardena Avenue, Glendale, California 91204, www.usst.com, and its telephone number is: (800) 835-8778.

        Preferred Stock.    The Board of Directors is authorized, subject to any limitations prescribed by applicable laws, rules and regulations, to provide for the issuance of Preferred Stock in one or more series, to establish from time to time the number of shares to be included in each such series, to fix the designations, powers, preferences and rights of the shares of each such series and any qualifications, limitations or restrictions thereof, and to increase or decrease the number of shares of any such series (but not below the number of shares of such series then outstanding) without any further vote or action by the stockholders. Although Summa has no present plan to issue any additional shares of Preferred Stock besides the existing Series A Preferred Stock (See "Recent Issuances and Repurchases" above), the issuance of Preferred Stock in the future could provide voting or conversion rights that would adversely affect the voting power or other rights of the holders of Common Stock and thereby reduce the value of the Common Stock. In addition, the issuance of Preferred Stock may have the effect of delaying, deferring or preventing a change in control of Summa. In particular, specific rights granted to future holders of Preferred Stock could be used to restrict Summa's ability to merge with or sell its assets to a third party, or otherwise delay, discourage or prevent a change in control of Summa.

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        Anti-Takeover Devices.    In addition to the ability to issue Preferred Stock, Summa's Certificate of Incorporation and Bylaws specifically prohibit cumulative voting and the right of stockholders to call a special meeting of stockholders, provide for the classification of the Board of Directors into three classes with one class elected annually, require a two-thirds supermajority stockholder vote to amend certain provisions of the Certificate of Incorporation and Bylaws, and include other provisions which are also likely to delay, discourage or prevent a change in control of Summa not approved by the Board of Directors and the Company's stockholders. Further, neither the Company's Certificate of Incorporation and Bylaws nor Delaware law prohibit the Company from adopting a stockholders' rights plan, or poison pill.

Shares Issuable Upon Exercise of Options

        As of August 31, 2002, 1,337,546 shares of Summa common stock were issuable upon exercise of options granted and/or available to be granted under its stock option plans and in connection with acquisitions, all of which are registered under the Securities Act. The existence of these stock options may adversely affect the terms on which Summa can obtain additional financing, and the holders of the options can be expected to exercise or convert them at a time when Summa, in all likelihood, would be able to obtain additional capital by offering shares of its Common Stock on terms more favorable to Summa than those provided by the exercise or conversion of such options. All options vest in full immediately prior to a change of control of the Company, as defined in the stock option plans.

Dividend Policy

        Summa has not paid a cash dividend since the fiscal year ended August 31, 1983. Summa does not intend to pay cash dividends on its Common Stock in the foreseeable future.

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ITEM 6.    SELECTED FINANCIAL DATA.

        The selected financial data set forth below for the years ended August 31, 2000, 2001 and 2002 have been derived from the audited consolidated financial statements of Summa included elsewhere herein. The selected financial data set forth below for the years ended August 31, 1998 and 1999 have been derived from audited consolidated financial statements of Summa that are not included herein. Prior year sales and certain costs and expenses have been reclassified to conform with current year presentations. The selected financial data set forth below should be read in conjunction with those financial statements (including the notes thereto) and with "Management's Discussion and Analysis of Financial Condition and Results of Operation" in Item 7 below.

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ITEM 7.    MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

General

        Statements contained in this Annual Report on Form 10-K, which are not purely historical, are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, including but not limited to statements regarding Summa's expectations, hopes, beliefs, intentions or strategies regarding the future, such as those set forth in "Business—Legal Proceedings" above. Actual results could differ materially from those projected in any forward-looking statements as a result of a number of factors, including those detailed in "Risk Factors" below and elsewhere in this Annual Report on Form 10-K. The forward-looking statements are made as of the date hereof, and the Company assumes no obligation to update the forward-looking statements, or to update the reasons why actual results could differ materially from those projected in the forward-looking statements.

        Summa manufactures plastic products for diverse commercial and industrial markets. Summa designs and manufactures injection-molded and formed plastic optical components for OEM customers in the lighting industry; modular plastic conveyor belt and chain for the food processing industry; engineered plastic fittings, valves, filters and tubing for the agricultural irrigation industry; molded plastic coil forms ("bobbins") for use in transformers, motors, relays and switches; and other molded and extruded plastic components for diverse industries.

Risk Factors

        Growth has been achieved by acquisition, development of new products and expansion of the Company's sales organization. There can be no assurance that Summa will be able to continue to consummate acquisitions, develop new products or expand sales to sustain rates of revenue growth and profitability in future periods comparable to those experienced in the past several years. See "Business—History of Acquisitions—Continuing Operations" above. Any future success that the Company may achieve will depend upon many factors including factors which may be beyond the control of Summa or which cannot be predicted at this time. Uncertainties and factors which could cause actual results or events to differ materially from those set forth or implied include:

•

changes in the markets for the products offered by the Company through its operating subsidiaries



•

increased levels of competition, including the entry of additional foreign and domestic competitors and increased success by existing competitors



•

reduced margins caused by competitive pressures, expiration of patents and other factors



•

increases in operating costs including costs of production, energy, materials, supplies, personnel, equipment, import duties and transportation



•

increases in borrowing costs and/or the availability of funds



•

increases in insurance costs, or the failure or inability to obtain adequate levels of insurance



•

increases in governmental regulation imposed under federal, state or local laws, including regulations applicable to environmental, labor and trade matters



•

changes in governmental regulation, including changes affecting the favorable tax benefits for export sales made by domestic entities



•

changing customer profiles

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•

general political, economic and industry conditions that affect customer demand and sales volume, both domestically and internationally



•

the introduction of new products by competitors or the failure to gain acceptance of new Company products



•

the timing of Summa's advertising and promotional campaigns



•

effects on the Company of its cost reduction initiatives



•

the loss of key personnel

Critical Accounting Policies and Estimates

        The following discussion and analysis of the Company's financial condition and results of operations are based upon the consolidated financial statements of the Company, which have been prepared in accordance with accounting principles generally accepted in the United States of America. The preparation of such financial statements requires management to make estimates and assumptions in applying certain critical accounting policies. Certain accounting estimates are particularly sensitive because of their significance to the Company's condensed consolidated financial statements and because of the possibility that future events affecting the estimates could differ markedly from current expectations. The Company believes that the following are some of the more critical judgment areas in the application of its accounting policies that affect the Company's financial statements.

        Impairment of Long-Lived Assets and Long-Lived Assets to be Disposed of.    The Company reviews its long-lived assets and certain identifiable intangibles for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to the undiscounted future operating cash flows expected to be generated by the asset. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of by sale are reported at the lower of the carrying amount or fair value less costs to sell.

        The Company has a significant amount of property and equipment and intangible assets. The determination as to whether events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable involves management's judgment. In addition, should the Company conclude that recoverability of an asset is in question, the estimate of undiscounted future operating cash flows to determine whether an asset is recoverable and, if not, the final determination of the fair value of the asset are also based on the judgment of management. These judgments can be impacted by a variety of underlying assumptions, such as the general business climate, effectiveness of competition and supply and cost of resources. Accordingly, actual results can differ significantly from the assumptions made by management in making its estimates. Future changes in management's estimates could result in indicators of impairment and future impairment charges.

        New accounting standards to be adopted by the Company effective September 1, 2002 eliminate the impairment recoverability tests for goodwill and certain other intangible assets with indefinite lives and require that such assets be valued at the lower of their carrying value or fair value. Significant management judgment is involved in determining the fair value of assets. Accordingly, future changes in management's estimates could result in impairment charges of goodwill and indefinite lived intangible assets.

        Valuation of Inventory.    The Company values its inventories at the lower of cost or market using the first-in, first-out (FIFO) method. Accordingly, the Company records adjustments to the value of inventory based upon obsolescence and changes in market value as permanent changes in the carrying amount of such inventory until its ultimate sale or other disposition. The Company has evaluated the current level of inventories considering planned sales volume and other factors and, based on this evaluation, has recorded adjustments to cost of goods sold to adjust inventory to net realizable value. These adjustments are estimates, which could vary significantly, either favorably or unfavorably, from actual requirements if future economic conditions, customer demand or competition differ from expectations.

14

Results of Operations

        The following table sets forth certain information derived from Summa's consolidated statements of income from continuing operations as a percentage of sales for the three years ended August 31, 2002, as well as the Company's effective income tax rate for each period presented. For a description of acquisitions during the periods presented, see "Business—History of Acquisitions—Continuing Operations" above.

        Net Sales.    For the year ended August 31, 2001, net sales increased by $1,256,000, or 1%, over the prior fiscal year, due to the inclusion of $18,620,000 in sales of newly acquired operations, substantially offset by a decrease in sales of previously owned businesses of $17,364,000. See "Business—History of Acquisitions—Continuing Operations" above. Comparative same business unit sales declined 12%, due to the general business downturn and discontinuation of some low margin commodity products. Of the 12% decline, approximately 4% was a result of the discontinuation of some commodity products and manufacturing services. Sales weakened throughout the year as a result of a deteriorating economy.

        For the year ended August 31, 2002, net sales decreased by $10,761,000, or 8%, from the prior fiscal year, due to a decrease in sales of previously owned businesses of $16,995,000, partially offset by the inclusion of $6,234,000 in sales of newly acquired operations. See "Business—History of Acquisitions—Continuing Operations" above. Comparative same business unit sales declined 13%, due to the general business downturn and discontinuation of some low margin commodity products. Of the 13% decline, approximately 4% was a result of the discontinuation of some commodity products and manufacturing services. The downward trend observed in fiscal 2001 was exacerbated in the beginning of fiscal 2002 by the effects of the September 11 attacks and ongoing related events.

        Cost of Sales.    For the year ended August 31, 2001, cost of sales increased by $2,817,000, or 3%, from the prior fiscal year, due to the inclusion of the results of newly acquired operations, and plant consolidation expenses incurred, partially offset by the decline in sales and related costs of previously owned businesses. As a percent of sales, costs of goods sold increased from 72.3% to 73.7%, due to the blending of newly acquired businesses with historically higher costs of goods sold, and the effects of reduced sales volume and costs related to plant consolidations. During the fiscal year, four facilities were closed and consolidated with other operations of the Company.

        For the year ended August 31, 2002, cost of sales decreased by $7,885,000, or 8%, from the prior fiscal year, due to the decline in sales of previously owned businesses, partially offset by the inclusion of the cost of sales of newly acquired operations. As a percent of sales, costs of goods sold increased from 73.7% to 73.8%, due to the blending of newly acquired businesses with historically higher costs of goods sold, and the effects of reduced sales volume and costs related to plant consolidations, offset by

15

the benefits of plant consolidations and other cost reduction initiatives. During the fiscal year, three facilities were closed and consolidated with other operations of the Company.

        Gross Profit.    For the year ended August 31, 2001, gross profit decreased $1,561,000, or 4%, from the prior fiscal year, primarily due to sales decreases in previously owned businesses and plant consolidation expenses of approximately $1,800,000, partially offset by operating cost savings of approximately $1,000,000 and by the effects of acquisitions. Gross margin declined from 27.7% to 26.3%, due to the effects of sales volume decreases and plant consolidation expenses.

        For the year ended August 31, 2002, gross profit decreased $2,876,000, or 9%, from the prior fiscal year, primarily due to sales decreases in previously owned businesses, partially offset by the effects of acquisitions. Gross margin declined from 26.3% to 26.2%, primarily due to the effects of sales volume decreases and the effects of acquisitions, offset by cost reduction initiatives.

        Selling, General, Administrative and Other Expense, Net ("Operating Expense").    For the year ended August 31, 2001, operating expenses increased $2,195,000, or 10%, from the prior fiscal year, primarily due to the inclusion of the operating expenses of newly acquired businesses, partially offset by decreases in operating expenses of previously owned operations and a gain on the sale of property, plant and equipment. See "Business—History of Acquisitions—Continuing Operations" above. As a percent of sales, operating expenses increased from 16.6% to 18.2%, primarily as a result of the effects of sales volume decreases and the blending of newly acquired businesses with historically higher operating expenses.

        For the year ended August 31, 2002, operating expenses decreased $1,207,000, or 5%, from the prior fiscal year, primarily due to the inclusion of a $723,000 gain on the sale of a facility and to decreases in operating expenses of previously owned operations, partially offset by the inclusion of operating expenses of newly acquired operations. See "Business—History of Acquisitions—Continuing Operations" above. As a percent of sales, operating expenses increased from 18.2% to 18.8%, primarily as a result of the effects of sales volume decreases, partially offset by the blending of newly acquired businesses with historically lower operating expenses.

        Interest Expense, Net.    Interest expense increased from $2,984,000 in fiscal 2000 to $3,851,000 in fiscal 2001, due to higher average levels of debt during the year, partially offset by decreasing variable interest rates during fiscal 2001. For fiscal 2002, interest expense decreased to $2,500,000 due to reduced levels of debt and lower interest rates. Interest expense relates primarily to interest on debt owed to banks, pursuant to the borrowing arrangement described in "Liquidity and Capital Resources—Financial Arrangements" below. Most of the outstanding borrowings under these arrangements were for acquisitions.

        Net Income.    As a result of the changes described above, net income decreased by $2,893,000, or 40%, in fiscal 2001 and decreased by $484,000, or 11%, in fiscal 2002.

        Effective Tax Rate.    For fiscal 2001, the effective tax rate decreased from 33.6% to 30.9% due to the distribution of earnings in lower tax rate jurisdictions, including a higher percentage of foreign sales corporation tax benefit relative to pre-tax earnings, and other non-recurring tax benefits. For fiscal 2002, the effective tax rate increased to 35.2% primarily due to changes in the distribution of earnings among various tax jurisdictions, including reduced foreign sales tax benefit.

        The Extraterritorial Income Exclusion of the U.S. Tax Code, which replaced the foreign sales corporation tax benefit, has been challenged by the World Trade Organization and may be revised in the future. If the Code were changed to eliminate this benefit, the effective tax rate of the Company would be higher by approximately 2% to 3% of pretax income.

16

        Inflation.    Inflation did not have a significant impact on Summa's operations during fiscal 2000 except during the fourth quarter of fiscal 2000. During that period, oil price increases resulted in increasing and increasingly volatile costs of plastic resin, energy and transportation. These factors did not have a material impact on the Company's financial results except in the fourth quarter, when they contributed to reduced gross margins.

        In fiscal 2001, prices of plastic resins stabilized, and the Company implemented price increases on selected products. Energy costs increased significantly in California. During fiscal 2001, the Company reduced its exposure to California energy costs by relocating several operations to the Midwest. In fiscal 2002 resin prices remained relatively stable. No significant amount of sales or purchases are made pursuant to fixed price, long-term agreements.

Liquidity and Capital Resources

        Sources and Uses of Funds.    The Company's primary sources of funds have been cash generated from operating activities and borrowings from third parties. See "Financing Arrangements" below. During the three fiscal years ended August 31, 2002, net cash provided by operating activities was $8,368,000 in 2000, $13,476,000 in 2001 and $11,865,000 in 2002. Cash flows from operations increased in 2001 compared to 2000 primarily due to reductions in accounts receivable and inventory resulting from declining same business unit sales and intentionally discontinued product lines. Cash flows from operations declined in 2002 compared to 2001 primarily due to decreased income and changes in the components of working capital.

        Summa's principal uses of cash have been the (i) support of operating activities, (ii) acquisitions of businesses, (iii) investment in capital improvements, (iv) reduction of debt and (v) repurchase of common stock. Cash used for certain investing activities for the three fiscal years ended August 31, 2002 is summarized in the following table:

        Investment is primarily for new product tooling activity, manufacturing equipment upgrades and new computer systems. Capital spending declined in 2001 primarily because certain assets of acquired businesses were redeployed throughout the organization. Although Summa expects to continue making substantial investments in tooling for new products, at August 31, 2002, Summa was not committed to any outside supplier for major capital expenditures, and believes its present capacity, augmented by anticipated continued investment in new product tooling and equipment, will be sufficient to meet demand for its products. For information relating to acquisitions, see "Business—History of Acquisitions—Continuing Operations" above.

        In August 2002, the Company announced a plan to repurchase up to $2,000,000 of its common stock, with no time limit. As of August 31, 2002, no repurchases had been made pursuant to this buy-back plan.

        Working Capital; Asset Utilization.    At fiscal year end August 31, working capital was $12,761,000 in 2000, $14,539,000 in 2001 and $16,301,000 in 2002, representing an increase of 14% from 2000 to 2001 and an increase of 12% from 2001 to 2002. The increase in 2001 was attributable to the inclusion of newly acquired operations, partially offset by a decline in working capital in previously owned businesses. The increase in 2002 was primarily attributable to a reduction in the current maturities of

17

long-term debt and the inclusion of newly acquired operations, partially offset by a decline in working capital in previously owned businesses.

        Asset utilization for the three fiscal years ended August 31, 2002 is illustrated in the following table:

        Financing Arrangements.    Summa has several debt relationships in place as described below. Substantially all of the Company's assets are pledged to secure debt. The bank term loans and revolving line of credit require compliance with various covenants.

        Summary of the Company's debt at August 31, 2002:

        Interest rates on the revolving line of credit and certain real estate loans are subject to market fluctuation, and the rates on the revolving line of credit are subject to reduction as the Company achieves certain financial milestones. See also Note 9 in the "Notes to Consolidated Financial Statements" of the Company in this Annual Report on Form 10-K.

        Summa believes that cash flows from operations and existing credit facilities will be sufficient to fund working capital requirements, planned capital expenditures and debt service for the next twelve months. The Company has a strategy of growth by acquisition. In the event an acquisition plan is adopted which requires funds exceeding the availability described above, an alternate source of funds to accomplish the acquisition would have to be developed. The Company has 10,000,000 shares of common stock authorized, of which 4,401,769 shares were outstanding at August 31, 2002, and 5,000,000 shares of "blank check" preferred stock authorized, of which 5,000 shares were outstanding at August 31, 2002. The Company could issue additional shares of common or preferred stock or enter into new or revised borrowing arrangements to raise funds.

Recent Accounting Pronouncements

        See Note 1 in the "Notes to Consolidated Financial Statements" in Part IV of this Annual Report on Form 10-K.

Effectiveness of Disclosure Controls and Procedures

        Within the ninety days prior to the date of this report, the Company carried out an evaluation, under the supervision and with the participation of the Company's management, including the Company's Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of the Company's disclosure controls and procedures pursuant to Exchange Act Rule 13a - 14. Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the Company's disclosure controls and procedures are effective. There were no significant changes in

18

the Company's internal controls or in other factors that could significantly affect these controls subsequent to the date of their evaluation.

ITEM 7A.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

        The Company's market risk relates to interest rate exposure on long-term borrowings. The Company does not use financial instruments for trading or other speculative purposes. Excess cash is primarily used to pay down the revolving line of credit. Borrowings against the revolving line of credit and certain real estate loans are at variable interest rates. All other borrowings are at fixed rates.

        At August 31, 2001, the Company had $13,201,000 of outstanding loans with interest rates varying from 2.8 percent to 6.8 percent, in traunches. A one percent increase in interest rates charged on the Company's outstanding variable rate borrowings would have resulted in an increase in annual interest expense of approximately $132,000, assuming the total outstanding amount of variable interest debt had remained the same as on August 31, 2001.

        At August 31, 2002, the Company had $15,917,000 of outstanding loans with interest rates varying from 4.0 percent to 4.9 percent, in traunches. A one percent increase in interest rates charged on the Company's outstanding variable rate borrowings would result in an increase in annual interest expense of approximately $159,000, assuming the total outstanding amount of variable interest debt were to remain the same as on August 31, 2002.

ITEM 8.    FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.

        The financial statements and related notes thereto of the Company filed herewith are set forth in Item 14 and included in Part IV of this Annual Report on Form 10-K.

ITEM 9.    CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE.

        As previously reported, effective on May 20, 2002 the Company dismissed its former independent public accountants, Arthur Andersen LLP ("Andersen") and, on May 21, 2002, the Company retained KPMG LLP as its new independent public accountants. The change in accountants was ratified and approved by the Board of Directors of the Company, upon the recommendation of the Audit Committee of the Board of Directors. KPMG LLP reviewed the Company's financial statements for its fiscal quarter ended May 31, 2002, included in the Company's Quarterly Report on Form 10-Q for such quarter, and audited the financial statements of the Company for the fiscal year ending August 31, 2002 included elsewhere in this Annual Report on Form 10-K.

        During the Company's fiscal years ended August 31, 2000 and 2001, and the subsequent interim period through May 20, 2002, there were no disagreements between the Company and Andersen on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure, which disagreements, if not resolved to Andersen's satisfaction, would have caused Andersen to make reference to the subject matter of the disagreement in connection with its reports on the Company's financial statements for such periods.

        None of the reportable events described under Item 304(a)(1)(v) of Regulation S-K occurred during the Company's fiscal years ended August 31, 2000 and 2001, or during the subsequent interim period through May 20, 2002.

        The audit reports issued by Andersen on the consolidated financial statements of the Company as of and for the fiscal years ended August 31, 2000 and August 31, 2001 did not contain any adverse opinion or disclaimer of opinion, nor were they qualified or modified as to uncertainty, audit scope or accounting principles. The Company provided Andersen with a copy of the foregoing disclosures at the time of dismissal, and a letter from Andersen confirming its agreement with these disclosures is attached to the Company's Form 8-K dated May 20, 2002.

        During the Company's fiscal years ended August 31, 2000 and 2001 and through May 20, 2002, the Company did not consult with KPMG LLP with respect to the application of accounting principles to a specified transaction or regarding any of the other matters or events set forth in Item 304(a)(2)(i) and (ii) of Regulation S-K.

19

PART III

ITEM 10.    DIRECTORS AND EXECUTIVE OFFICERS OF REGISTRANT.

        Incorporated by reference from Summa's definitive Proxy Statement to be filed with the Commission not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K. Specifically excludes from incorporation disclosures in the Proxy Statement made under Item 7(d)(3) of Regulation 14A.

ITEM 11.    EXECUTIVE COMPENSATION.

        Incorporated by reference from Summa's definitive Proxy Statement to be filed with the Commission not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K. Specifically excludes from incorporation disclosures in the Proxy Statement made under paragraphs (k) and (l) of Item 402 of Regulation S-K.

ITEM 12.    SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT.

        Incorporated by reference from Summa's definitive Proxy Statement to be filed with the Commission not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.

ITEM 13.    CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS.

        Incorporated by reference from Summa's definitive Proxy Statement to be filed with the Commission not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.

20

PART IV

ITEM 14.    EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K.

(a)

Financial Statements, Financial Statement Schedules and Exhibits:

        The following documents are either filed herewith or incorporated herein by reference:

        1.    Financial Statements.    The audited consolidated financial statements of Summa and subsidiaries as of August 31, 2001 and 2002 and for each of the three years in the period ended August 31, 2002 (including the notes thereto which contain unaudited quarterly financial data for each of the two years ended August 31, 2002), and the report of independent public accountants thereon, are included herein as set forth in the "Index to Consolidated Financial Statements" set forth on page F-1.

        2.    Financial Statement Schedules.    The following financial statement schedules:

        Schedule II—Valuation and qualifying accounts.

        3.    Exhibits.    The following exhibits to this Annual Report on Form 10-K are either filed herewith or incorporated herein by reference as indicated:

21

(1)

Incorporated by reference from the exhibits to the Company's Registration Statement on Form S-4 filed with the Commission on May 24, 1993.

(2)

Incorporated by reference from the appendices to the Company's definitive Proxy Statement on Schedule 14A for the Annual Meeting of Shareholders held November 21, 1996.

(3)

Incorporated by reference from the appendices to the Calnetics' definitive Proxy Statement on Schedule 14A for the Special Meeting of Shareholders held October 28, 1997.

(4)

Incorporated by reference from exhibits to the Company's Quarterly Report on Form 10-Q for the fiscal quarter ended May 31, 1998.

(5)

Incorporated by reference from exhibits to the Company's Current Report on Form 8-K dated March 5, 1999.

(6)

Incorporated by reference from exhibits to the Company's Annual Report on Form 10-K for the fiscal year ended August 31, 1999.

(7)

Incorporated by reference from exhibits to the Company's Current Report on Form 8-K dated October 5, 2000.

22

(8)

Incorporated by reference from exhibits to the Company's Current Report on Form 8-K dated December 1, 2000.

(9)

Incorporated by reference from exhibits to the Company's Quarterly Report on Form 10-Q for the fiscal quarter ended November 30, 2001.

(10)

Incorporated by reference from the appendices to the Company's definitive Proxy Statement on Schedule 14A for the Annual Meeting of Shareholders held January 26, 1998.

(11)

Incorporated by reference from exhibits to the Company's Registration Statement on Form S-8 filed with the Commission on April 15, 1993.

(12)

Incorporated by reference from exhibits to the Company's Registration Statement on Form S-8 filed with the Commission on January 30, 1997.

(13)

Incorporated by reference from exhibits to the Company's Registration Statement on Form S-8 filed with the Commission on December 15, 1998.

(14)

Incorporated by reference from exhibits to the Company's Annual Report on Form 10-K for the fiscal year ended August 31, 2001.

*

Filed herewith.

(b)

Reports on Form 8-K filed during the last quarter of the fiscal year ended August 31, 2002:

        None.

23

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

F-1

Reports of Independent Public Accountants

TO:    The Board of Directors and Stockholders of Summa Industries:

        We have audited the accompanying consolidated balance sheet of Summa Industries and subsidiaries as of August 31, 2002 and the related consolidated statements of income, stockholders' equity and cash flows for the year ended August 31, 2002. These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements based on our audit.

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

        In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of Summa Industries and subsidiaries as of August 31, 2002, and the results of their operations and their cash flows for the year then ended, in conformity with accounting principles generally accepted in the United States of America.

/s/ KPMG LLP

Los Angeles, California
October 7, 2002

F-2

Reports of Former Independent Public Accountants

(Copy of previously issued Arthur Andersen LLP report; not reissued by Arthur Andersen LLP)

TO:    The Board of Directors and Stockholders of Summa Industries:

        We have audited the accompanying consolidated balance sheets of Summa Industries (a Delaware corporation) and subsidiaries as of August 31, 2000 and 2001 and the related consolidated statements of income, stockholders' equity and cash flows for each of the three years in the period ended August 31, 2001. These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements based on our audits.

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

        In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of Summa Industries and subsidiaries as of August 31, 2000 and 2001, and the results of their operations and their cash flows for each of the three years in the period ended August 31, 2001, in conformity with accounting principles generally accepted in the United States.

/s/ ARTHUR ANDERSEN LLP

Los Angeles, California
October 9, 2001

F-3

Summa Industries

CONSOLIDATED BALANCE SHEETS
as of August 31

See accompanying notes to consolidated financial statements.

F-4

Summa Industries

CONSOLIDATED STATEMENTS OF INCOME
for the years ended August 31

See accompanying notes to consolidated financial statements.

F-5

Summa Industries

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
for the three years ended August 31, 2002

See accompanying notes to consolidated financial statements.

F-6

Summa Industries

CONSOLIDATED STATEMENTS OF CASH FLOWS
for the years ended August 31

See accompanying notes to consolidated financial statements.

F-7

Summa Industries

Notes to Consolidated Financial Statements
For the year ended August 31, 2002

1.    Description of business and summary of significant accounting policies

Nature of operations

        Summa Industries, a Delaware corporation ("Summa" or the "Company"), develops and manufactures proprietary plastic products for diverse industrial and commercial markets, primarily located in the United States.

Basis of presentation and principles of consolidation

        The accompanying consolidated financial statements include the accounts of Summa and its wholly-owned subsidiaries and is prepared in accordance with generally accepted accounting principles in the United States of America. The results of operations of acquired companies have been included in the consolidated statements of income and cash flows of the Company since the dates of acquisitions. See Note 16. All intercompany account balances and transactions have been eliminated in consolidation. Prior year amounts in the accompanying financial statements have been reclassified to conform with current year presentations.

Use of estimates in the preparation of financial statements

        The preparation of financial statements in conformity with United States generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Revenue recognition

        Revenue from product sales is recognized when title passes to the buyer, usually upon shipment.

Inventories

        Inventories are stated at the lower of cost (determined on a first-in, first-out basis) or market. Cost includes material, labor and manufacturing overhead. Lower of cost or market adjustments are charged to cost of sales as identified.

Property, plant and equipment

        Depreciation is charged against earnings, principally using the straight-line method, over the estimated useful lives of the related assets as follows:

        Maintenance, repairs and minor renewals are charged directly to expense as incurred. Additions and improvements to property, plant and equipment are capitalized. When assets are disposed of, the

F-8

related cost and accumulated depreciation thereon are removed from the accounts, and any gain or loss is included in operations.

Intangible assets

        Intangible assets include goodwill and other intangibles such as trade names, patents and customer lists recognized in connection with business acquisitions. Goodwill was amortized over 15-40 years until August 31, 2002. Other intangibles are being amortized over their estimated useful lives of 10-17 years. See Note 7 and "Recent accounting pronouncements", below.

Long-lived assets

        The Company has adopted the Statement of Financial Accounting Standards (SFAS) No. 121, "Accounting for the Impairment of Long-Lived Assets and Long-Lived Assets to be Disposed of". Management monitors its long-lived assets, identifiable intangibles and goodwill related to those assets, and considers whether events or changes in circumstances have occurred which indicate that the value of assets may not be recoverable. Recoverability is measured by comparison of carrying amount to the undiscounted future net cash flows an asset is expected to generate. If an asset is considered to be impaired, the impairment to be recognized is measured by the amount at which the carrying amount of the assets exceeds the projected discounted future cash flows. No impairment has occurred as of August 31, 2002.

Earnings per common share

        Basic earnings per common share (EPS) is based on income available to common stockholders divided by the weighted average number of common shares outstanding during the year. Diluted EPS is similar to the computation for basic EPS except that the denominator is increased to include the number of additional common shares that would have been outstanding if the dilutive potential common shares had been issued. See Note 2 for details of the computation.

Cash equivalents

        The Company considers all highly liquid debt instruments with an original maturity of three months or less to be cash equivalents.

Income taxes

        The Company accounts for income taxes in accordance with the SFAS No. 109 "Accounting for Income Taxes". This statement requires that income taxes be accounted for using the asset and liability method. Under the asset and liability method, deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. This method also requires the recognition of future tax benefits such as net operating loss carryforwards, to the extent that realization of such benefits is more likely than not. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.

Stock-based compensation

        The Company reports stock based compensation to employees and directors in accordance with Accounting Principles Board (APB) Opinion No. 25, "Accounting for Stock issued to Employees" and Financial Interpretation No. 44, "Accounting for Certain Transactions Regarding Stock Compensation."

F-9

The Company has adopted the appropriate disclosure requirements of SFAS No. 123, "Accounting for Stock-Based Compensation." See Note 12.

Recent accounting pronouncements

        In June 2001, the Financial Accounting Standards Board ("FASB") issued Statements of Financial Accounting Standards No. 141 ("SFAS 141") "Business Combinations" and No. 142 ("SFAS 142") "Goodwill and Other Intangible Assets." These statements eliminate the pooling of interests method of accounting for business combinations as of June 30, 2001 and eliminate the amortization of goodwill for all fiscal years beginning after December 15, 2001. Goodwill is accounted for under an impairment-only method after this date. The Company has adopted SFAS 141 and SFAS 142 with respect to new goodwill as of July 1, 2001 and will adopt SFAS 142 with respect to existing goodwill as of September 1, 2002, the first day of its 2003 fiscal year. The adoption of SFAS 141 has not impacted the Company's financial condition or results of operations. In accordance with SFAS 142, existing goodwill was amortized through the end of fiscal 2002 at which time amortization ceased. The Company is currently assessing the impact of adopting SFAS 142 with respect to existing goodwill and will perform a transitional goodwill impairment test during the first half of fiscal 2003. Total goodwill amortization was $882,000 in fiscal 2000, $1,062,000 in fiscal 2001 and $1,096,000 in fiscal 2002.

        In August 2001, the FASB issued Statement of Accounting Standards No. 143 ("SFAS 143") "Accounting for Asset Retirement Obligations". SFAS 143 is to be adopted for all fiscal years beginning after June 15, 2002. The Company will adopt SFAS 143 in fiscal 2003. The Company is currently reviewing the requirements of SFAS 143 and has not yet determined its impact, if any, on the Company's financial position and results of operations.

        In August 2001, the FASB issued Statement of Financial Accounting Standards No. 144 ("SFAS 144") "Accounting for the Impairment or Disposal of Long-Lived Assets." SFAS 144 is to be adopted for all fiscal years beginning after December 15, 2001. The Company will adopt SFAS 144 in fiscal year 2003. The Company is currently reviewing the requirements of SFAS 144 and has not yet determined its impact, if any, on the Company's financial position and results of operations.

        In April 2002, the FASB issued Statement of Financial Accounting Standards No. 145 ("SFAS 145") "Rescission of FASB Statements No. 4, 44 and 64, Amendment of FASB Statement No. 13, and Technical Corrections" which requires that the extinguishment of debt not be considered an extraordinary item under APB Opinion No. 30 ("APB 30") "Reporting the Results of Operations—Reporting the Effects of Disposal of a Segment of Business, and Extraordinary, Unusual and Infrequently Occurring Events and Transactions" unless the debt extinguishment meets the "unusual in nature and infrequent of occurrence" criteria in APB 30. SFAS 145 is effective for fiscal years beginning after May 15, 2002 and, upon adoption, companies must reclassify prior period items that do not meet the extraordinary item classification criteria in APB 30. The adoption of SFAS 145 is not expected to have any impact on the Company's financial position or results of operation.

        In July 2002, the FASB issued Statement of Financial Accounting Standards No. 146 ("SFAS 146") "Accounting for Costs Associated with Exit or Disposal Activities" which nullifies EITF Issue No. 94-3 "Liability Recognition for Certain Employee Termination Benefits and Other Costs to Exit an Activity (including Certain Costs Incurred in a Restructuring)." SFAS 146 requires that costs associated with an exit or disposal activity be recognized only when the liability is incurred (that is, when it meets the definition of a liability in the FASB's conceptual framework). SFAS 146 also establishes fair value as the objective for initial measurement of liabilities related to exit or disposal activities. SFAS 146 is effective for exit or disposal activities that are initiated after December 31, 2002. The adoption of SFAS 146 is not expected to have a material impact on the Company's financial position or results of operation.

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2.    Earnings per share

        Basic earnings per share ("EPS") was computed by dividing net income available to common stockholders by the weighted average number of common shares outstanding during each period. The Company has 5,000 shares of convertible preferred stock outstanding with an original issue price of $5,000,000. No dividends are required to be paid on the stock, but the preferred stockholders have the right, provided the preferred stock has not been converted to common shares, to require the Company to repurchase the stock during a one year period beginning December 14, 2004 at an aggregate price which increases daily from $7,025,000 on December 14, 2004 to $7,868,000 on December 13, 2005. The net income available to common stockholders used in the EPS calculations is the reported net income less the reported accretion in the value of the preferred stock for that period.

        Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. Diluted EPS was calculated using the "treasury stock" method as if dilutive options had been exercised and the funds were used to purchase common shares at the average market price during the period. Options to purchase 203,708 common shares as of August 31, 2000, 206,926 common shares as of August 31, 2001 and 412,940 common shares as of August 31, 2002 were excluded from the calculation of equivalent shares, as they would have been anti-dilutive. The 5,000 shares of outstanding preferred stock, convertible into 625,000 shares of common stock, were excluded from the calculation of equivalent shares, as they would have been anti-dilutive.

        The following is a reconciliation of the numerators and denominators of the basic and diluted EPS computations for "income available to common stockholders" and other disclosures required by Statement of Accounting Standards No. 128, "Earnings per Share", for the years ended August 31:

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3.    Supplemental cash flow information

        Cash flows from net changes in assets and liabilities, net of effects of acquisitions for the years ended August 31:

        Cash paid during the years ended August 31:

        Non-cash investing and financing activities: