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SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

(Mark One)

OR

Commission file number 1-1070

OLIN CORPORATION

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (203) 750-3000

Securities registered pursuant to Section 12(b) of the Act:

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

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days.

Yes   x     No  ¨

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

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

As of June 30, 2003, (the last business day of the registrant’s most recently completed second fiscal quarter), the aggregate market value of registrant’s common stock, par value $1 per share held by non-affiliates of registrant was approximately $990,736,832.

As of February 29, 2004, 69,214,707 shares of the registrant’s common stock were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the following document are incorporated by reference in this Form 10-K

as indicated herein:

PART I

Item 1. BUSINESS

GENERAL

Olin Corporation is a Virginia corporation, incorporated in 1892, having its principal executive offices in Norwalk, Connecticut. We are a manufacturer concentrated in three business segments: Chlor Alkali Products, Metals and Winchester^®. Chlor Alkali Products manufactures chlorine and caustic soda, sodium hydrosulfite, hydrochloric acid and bleach products, which represent 25% of 2003 sales. Metals products, which represent 56% of 2003 sales, include copper and copper alloy sheet, strip, foil, rod, welded tube, fabricated parts, metal packages and stainless steel and aluminum strip. Winchester products, which represent 19% of 2003 sales, include sporting ammunition, canister powder, reloading components, small caliber military ammunition and industrial cartridges.

We maintain an Internet website at http://www.olin.com. Our reports on Form 10-K, Form 10-Q, and Form 8-K, as well as amendments to those reports, are available free of charge on our website, as soon as reasonably practicable after we file the reports with the Securities and Exchange Commission. Our Principles of Corporate Governance, Committee Charters and Code of Business Conduct are available in the Corporate Governance section of the Investor section of our website at www.olin.com.

PRODUCTS, SERVICES AND STRATEGIES

Chlor Alkali Products

Products and Services

We have been involved in the U.S. chlor alkali industry for more than 100 years and are a major participant in the U.S. chlor alkali market. Chlorine and caustic soda are co-produced commercially primarily by the electrolysis of salt. These co-products are produced simultaneously, and in a fixed ratio of 1.0 ton of chlorine to 1.1 tons of caustic soda. The industry refers to this as an Electrochemical Unit or ECU. With a demonstrated capacity as of the end of 2003 of 1.22 million ECUs per year, including 50% of the production from our partnership with PolyOne Corporation, which we refer to as our Sunbelt joint venture, we are the fourth largest chlor alkali producer in the United States, according to data from Chemical Market Associates, Inc. (CMAI). CMAI is a global petrochemical, plastics and fibers consulting firm established in 1979. According to CMAI data, we are the largest producer measured by production volume of chlorine and caustic soda in the eastern United States, with facilities located in McIntosh, Alabama, Charleston, Tennessee, Augusta, Georgia, and Niagara Falls, New York. Since transportation costs can be a significant part of the final cost of the product to the customer, our close proximity to our caustic customers is an advantage. Approximately two-thirds of our caustic soda production is high purity membrane and rayon grade, which according to CMAI data, normally commands a premium selling price in the market.

Our manufacturing facilities in Augusta, McIntosh, Charleston, and a portion of our facility in Niagara Falls are ISO 9002 certified. ISO 9000 (which includes ISO 9001 and ISO 9002) and ISO 14000 (which includes ISO 14001) are sets of related international standards on quality assurance and environmental management developed by the International Organization for Standardization to help companies effectively document the quality and environmental management system elements to be implemented to maintain effective quality and environmental management systems. All four of these manufacturing facilities have also achieved Star status in the Voluntary Protection Program (VPP) of the Occupational Safety and Health Administration (OSHA). OSHA’s VPP is a program in which companies voluntarily participate that recognizes facilities for their exemplary safety and health programs.

Chlorine is used as a raw material in the production of thousands of products, but a significant portion of U.S. chlorine production is consumed in the manufacture of ethylene dichloride, or EDC, a precursor for polyvinyl chloride, or PVC. PVC is a plastic used in applications such as vinyl siding, plumbing and automotive parts. Other U.S. end-uses for chlorine include chlorinated intermediates, isocyanates and water treatment. While much of the chlorine produced in the U.S. is consumed by the producing company to make downstream products, we sell most of the chlorine we produce to third parties in the merchant market.

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Caustic soda has a wide variety of end use applications, the largest of which is in the pulp and paper industry. Caustic soda is also used in the production of detergents and soaps, alumina and a variety of other inorganic and organic chemicals.

The chlor alkali industry is cyclical, both as a result of changes in demand for each of the co-products and as a result of the large increments in which new capacity is added. Because chlorine and caustic are produced in a fixed ratio, the supply of one product can be constrained both by the physical capacity of the production facilities and/or by the ability to sell the co-product. Prices for both products respond rapidly to changes in supply and demand. Our prices bottomed out in the second quarter of 2002 at approximately $200 and then increased through the third quarter of 2003. In the fourth quarter of 2003, our prices began to decrease.

Electricity and salt are the major purchased raw materials for our Chlor Alkali Products segment. Raw materials represent approximately 50% of the total cost of producing an ECU. Electricity is the single largest raw material component in the production of chlor alkali products. Our electricity costs have been stable over the last ten years because we are supplied by utilities that primarily utilize coal, hydroelectric and nuclear power and have relatively minor exposure to natural gas. We have contracts which are based on large non-seasonal usage. The majority of the salt used in our Chlor Alkali Products segment is produced from internal resources but we do purchase salt on the merchant market. We have contracts for our purchased salt, which are also based on large non-peak demand usage. The commodity nature of this industry places an added emphasis on cost management and we believe that we have managed our manufacturing costs in a manner that makes us one of the low cost producers in the industry. In addition, as market demand grows in the future, the design of the Sunbelt joint venture plant will enable us to expand capacity cost-effectively.

We also manufacture a small volume of chlor alkali-related products and we recently invested in capacity and product upgrades in these areas. These products include chemically processed salt, hydrochloric acid, sodium hypochlorite and hydrogen. We also sell sodium hydrosulfite to paper, textile and clay bleaching customers.

The following table lists products of our Chlor Alkali Products business, with principal products on the basis of annual sales highlighted in bold face.

Strategies

Continued Role as a Preferred Supplier to Merchant Market Customers.    Based on our market research, we believe our Chlor Alkali Products business is viewed as a preferred supplier by our merchant market customers. We will continue to focus on providing quality customer service support and developing relationships with our valued customers.

Pursue Incremental Expansion Opportunities.    We have invested in capacity and product upgrades in our chemically processed salt, hydrochloric acid, sodium hypochlorite and hydrogen businesses. These expansions increase our captive use of chlorine while increasing the sales of these co-products. These niche businesses provide opportunities to upgrade chlorine and caustic to higher value-added applications. We also have the opportunity, when business conditions permit, to pursue incremental expansion through our Sunbelt joint venture.

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Metals

Products and Services

We have been in the Metals business for approximately 87 years. Based on Copper Development Association Inc. (CDA) data, we are a leading manufacturer of copper and copper alloy sheet, strip, plate, foil and brass rod in the United States. CDA acts as the central authoritative source of data and information pertaining to the U.S. copper and brass industry. While primarily processing copper alloys, we also reroll and form other metals, such as aluminum and stainless steel. We believe we hold leading positions for premium priced, high performance alloys in the United States. We supply high performance alloys to non-U.S. customers through exports, technology licensing, joint ventures and local distribution. Participants in the copper sheet and strip industry include integrated mills, reroll mills and distributors, with many participants engaging in multiple roles. We believe that we are the largest U.S. participant in each of these categories. We believe that our status as the largest U.S. participant affords us a favorable industry position. We also believe we are one of the lowest cost producers, a quality and service leader and a specialty product innovator.

All of our copper sheet and strip mills are both QS 9000 and ISO 9000 certified. QS 9000 is an international automotive standard that was developed by General Motors, Ford Motor Company and Chrysler to harmonize the fundamental supplier quality systems as an assessment tool, and is based upon ISO 9000 standards. All sheet and strip locations are ISO certified. In September 2002, we completed our acquisition of Chase Industries Inc., which we refer to as Chase. Chase, with 2003 sales of $222 million, is a leading manufacturer and supplier of free-machining brass rod in the U.S. and Canada and is ISO 9002 certified.

We maintain many advantages over our competition through our patent-protected technologies. We believe our high performance alloys provide superior strength, conductivity and formability to customers in the automotive, electrical, electronic and telecommunications industries. We currently hold 31 U.S. patents associated with high performance alloys and 61 other U.S. patents related to various proprietary processing and technical capabilities, many of which are also registered in foreign jurisdictions. To further our global presence, we have established a joint venture with Yamaha Corporation in Japan to produce high performance alloys, formed a technical alliance with Wieland-Werke A.G. of Germany under which we jointly develop new high performance alloys and participate in an alloy licensing arrangement and formed a joint venture in 2002 with Luoyang Copper (Group) Ltd. in China to jointly construct and operate a metals distribution center to service the growing Chinese demand, which should be operational in first quarter 2004. These relationships provide us with greater global reach and enable us to provide high performance alloys in Asia and Europe.

In addition, through sales of our clad metal, produced by a proprietary cladding process, we believe we are a major supplier of coinage metal to the U.S. Mint. We also supply coinage metal to other world governments. Our Metals segment produces ammunition cartridge cups for use captively in the manufacture of our Winchester sporting ammunition, which constitutes a small portion of our total Metals segment output. We also sell cartridge brass to other ammunition makers. This relationship with Winchester, along with our growing fabrication business for select customers, provides us with a significant captive customer base.

Brass and other copper alloys are manufactured by melting copper together with various combinations of zinc, lead or other metals. The resulting product goes through a series of processes, including casting, hot rolling, milling, cold rolling, annealing, cleaning and slitting to produce sheet and strip and a similar process for the production of rod. The principal end-uses for sheet and strip products include: automotive (connectors and radiators); electronics (lead frames, connectors, wiring and telecommunications applications); ammunition; coinage; and other applications such as builder’s hardware, plumbing supplies and welded tube for utility condensers and industrial heat exchangers. Brass rod is used to produce a variety of products, such as faucets, plumbing fittings, heating and air conditioning components, industrial valves, automotive parts and numerous hardware components.

The major raw materials used in our metals business are copper, zinc, other non-ferrous metals and brass scrap, purchased from merchants, dealers and customers at market prices.

Historically, demand for copper sheet and strip and rod has exhibited growth consistent with the growth in the U.S. gross domestic product. In the late 1990’s and in 2000, demand expanded at a rapid pace principally due to the

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strength of the U.S. economy. From 1997 to 2000, sheet and strip demand grew at an annualized growth rate of approximately 8%. In 2001 through 2003, demand was lower primarily because of the economic downturn.

The following table lists products and services of our Metals business, with principal products on the basis of annual sales highlighted in bold face.

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Strategies

Continue Profitable Growth Globally.    Our goal is to be a leading worldwide supplier of specialty copper-based products and related engineered materials. We intend to achieve this goal by building our high performance alloys business on a global basis. In 2002, we took a number of actions to further develop our global presence, including the acquisition of Chase, a leading manufacturer and supplier of brass rod in the United States and Canada. We entered into an agreement with Luoyang Copper (Group) Ltd. in 2002 to jointly construct and operate a metals service center in Guangzhou, China, which we expect to be operational in the first quarter of 2004.

Maintain Premier Specialty Product Innovator Position.    We believe that we manufacture more high performance alloys than any other competitor, and we continue to allocate resources to maximize this product line. Our specialty products include proprietary high performance alloys and materials that meet strength, gauge, formability and conductivity requirements for applications in our customers’ industries.

Increase Cost Efficiencies.    We will continue to focus on achieving economies of scale, improved manufacturing processes and innovation in pursuit of cost reductions. We strive for profit improvements primarily through yield improvements, increased equipment utilization and capacity enhancements.

Continue Our Quality Leadership.    We will maintain ISO 9000, QS 9000, and ISO 14001 certifications. For example, our East Alton, Illinois mill carries the distinctive certifications of ISO 9001, due to its extensive design work, and ISO 14001, a prominent environmental standard. We believe that these certifications demonstrate a quality advantage not possessed by our key U.S. competitors. We also continue to maintain preferred supplier positions with some of the largest or most respected companies in segments where quality is essential, such as automotive and electronics.

Leverage Our Service and Distribution Leadership for Growth.    We believe that we are a service and distribution leader in the copper-based metals industry. Our A.J. Oster distribution system extends throughout the United States and also includes facilities in Puerto Rico and Mexico. We sell directly from the mill to large volume customers, and to small and medium size customers through A.J. Oster and other licensed distributors. We intend to leverage our service leadership and our distribution network to improve our just-in-time delivery services and our customized order capabilities.

Winchester

Products and Services

Winchester is in its 137th year of operation and its 73^rd year as part of Olin. Winchester is a premier developer and manufacturer of small caliber ammunition for sale to domestic and international retailers, law enforcement agencies and domestic and international militaries. We believe we are a leading U.S. producer of ammunition for recreational shooters, hunters, law enforcement agencies and the U.S. Armed Forces. Our legendary Winchester product line includes all major gauges and calibers of shotgun shells, rimfire and centerfire ammunition for pistols and rifles, canister powder, reloading components and industrial cartridges. We believe we are the market leader in both shotshell and centerfire pistol ammunitions. We expect the sporting ammunition industry to be flat in 2004.

Winchester has strong relationships throughout the sales and distribution chain and strong ties to traditional dealers and distributors. Winchester has built its business with key high volume mass merchants and specialty sporting goods retailers. We have consistently developed industry-leading ammunition, and for the last six years, Winchester was recognized with the “Ammunition of the Year” award from the Shooting Industry Academy of Excellence for its technological and design leadership.

Winchester purchases raw materials such as lead from merchants, dealers and customers at market prices as posted on exchanges such as the Commodity Metals Exchange, or COMEX, and London Metals Exchange, or LME. Winchester also purchases copper-based strip and cups from our Metals segment. Winchester’s other main raw material is propellant, which is purchased predominately from one of the United States’ largest propellant suppliers.

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The following table lists products and services of our Winchester business, with principal products on the basis of annual sales highlighted in bold face.

Strategies

Leverage Existing Strengths.    Winchester will focus on seeking new opportunities to leverage the legendary Winchester brand name and will continue to offer a full line of ammunition products to the markets we serve, with specific focus on investments that lower our costs and that make Winchester ammunition the retail brand of choice.

Focus on Product Line Growth.    With a long record of pioneering new product offerings, Winchester has built a strong reputation as an industry innovator. This includes the introduction of reduced-lead and non-lead products, which are growing in popularity for use in indoor shooting ranges and for outdoor hunting.

RECENT DEVELOPMENTS

In January 2004, we announced that our board of directors approved plans to move our corporate headquarters to the East Alton, Illinois area. The decision to relocate was driven by the organizational, strategic and economic advantages to locating our corporate headquarters in the East Alton area. The relocation of corporate headquarters will be accompanied by a downsized corporate structure more appropriate for us in today’s competitive business environment. We expect the headquarters relocation to be completed by the end of 2004. Currently, 82 people are employed on the corporate staff, including 66 in Norwalk. When completed, the efficiencies of being substantially co-located with the Brass and Winchester businesses will result in corporate personnel being reduced by more than forty percent, with total projected savings of approximately $6 million per year. As a result of the relocation, we expect to incur one-time costs of approximately $12 million which will be disclosed as expensed primarily throughout 2004. We expect to provide job transition benefits and outplacement services to all affected employees. The transition is expected to begin in the second quarter of 2004.

On February 3, 2004, we issued and sold 10 million shares of our common stock at a public offering price of $18.00. Net proceeds from the sale were approximately $178 million and were used to make a voluntary contribution of $125 million to our pension plan. The balance of the proceeds of $53 million is available to retire maturing debt or for other corporate purposes.

INTERNATIONAL OPERATIONS

We have sales offices and subsidiaries in various countries which support the worldwide export of products from the United States as well as overseas production facilities. In addition, we manufacture and distribute sodium hydrosulfite in Brazil.

Yamaha-Olin Metal Corporation, manufactures high-performance copper alloys in Japan for sale to the electronics industry throughout the Far East. Our subsidiary, Olin Australia Limited, loads and packs sporting and industrial ammunition in Australia. We entered into an agreement with Luoyang Copper (Group) Ltd. to jointly construct and operate a metals service

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center in Guangzhou, China, which we expect to be operational in the first quarter of 2004. See the Note “Segment Information” of the Notes to Consolidated Financial Statements in Item 8, for geographic segment data. We are incorporating our segment information from that Note into this section of our Form 10-K.

CUSTOMERS AND DISTRIBUTION

During 2003, no single customer accounted for more than 5% of consolidated sales. Sales to all U.S. government agencies and sales under U.S. government contracting activities in total accounted for approximately 9% of consolidated sales in 2003. Products we sell to industrial or commercial users or distributors for use in the production of other products constitute a major part of our total sales. We sell some of our products, such as sporting ammunition and brass, to a large number of users or distributors, while we sell others, such as chlorine and caustic soda, in substantial quantities to a relatively small number of industrial users. We discuss the customers for each of our three businesses in more detail above under “Products and Services.”

We market most of our products and services primarily through our sales force and sell directly to various industrial customers, the U.S. Government and its prime contractors, to wholesalers and other distributors.

Because we engage in some government contracting activities and make sales to the U.S. Government, we are subject to extensive and complex U.S. Government procurement laws and regulations. These laws and regulations provide for ongoing government audits and reviews of contract procurement, performance and administration. Failure to comply, even inadvertently, with these laws and regulations and with laws governing the export of munitions and other controlled products and commodities could subject us or one or more of our businesses to civil and criminal penalties, and under certain circumstances, suspension and debarment from future government contracts and the exporting of products for a specified period of time.

COMPETITION

We are in active competition with businesses producing the same or similar products, as well as, in some instances, with businesses producing different products designed for the same uses. We are among the largest manufacturers or distributors in the United States of ammunition, copper and copper alloys and certain chlor alkali products based on data provided by the Sporting Arms and Ammunition Manufacturers’ Institute (SAAMI), CDA and CMAI, respectively. Founded in 1926, SAAMI is an association of the nation’s leading manufacturers of sporting firearms, ammunition and components. Many factors influence our ability to compete successfully, including price, delivery, service, performance, product innovation and product recognition and quality, depending on the product involved.

EMPLOYEES

As of December 31, 2003, we had approximately 5,700 employees (excluding approximately 56 employees at Government-owned, contractor-operated facilities), with approximately 5,600 working in the United States and approximately 100 working in foreign countries. Various labor unions represent a majority of our hourly-paid employees for collective bargaining purposes. Although some labor contracts extend for as long as six years, others are for shorter periods. A labor contract for approximately 210 employees at the Chlor Alkali Products Division’s McIntosh, Alabama facility expires in April 2004 and a labor contract for approximately 235 employees at the Metals facility in Montpelier, Ohio expires in June 2004. While we believe our relations with our employees and their various representatives are generally satisfactory, we cannot assure you that we can conclude these labor contracts or any other labor agreements without work stoppages.

RESEARCH ACTIVITIES; PATENTS

Our research activities are conducted on a product-group basis at a number of facilities. Company-sponsored research expenditures were approximately $5 million during each of 2003, 2002 and 2001.

We own or license a number of patents, patent applications and trade secrets covering our products and processes, particularly for use in our Metals segment. We believe that, in the aggregate, the rights under our patents

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and licenses are important to our operations, but we do not consider any individual patent or license or group of patents and licenses related to a specific process or product to be of material importance to our total business.

RAW MATERIALS AND ENERGY

We purchase the major portion of our raw material requirements. The principal basic raw materials for our production of chlor alkali products are salt, electricity, sulfur dioxide, chlorine and hydrogen. Copper, zinc, various other nonferrous metals and brass scrap are required for the Metals business. Lead, brass and propellant are the principal raw materials used in the Winchester business. We typically purchase our principal basic raw materials pursuant to multiyear contracts. In the manufacture of ammunition, we use a substantial percentage of our own output of cartridge brass. We provide additional information with respect to specific raw materials in the tables above under “Products and Services.”

Electricity is the predominant energy source for our manufacturing facilities. Most of our facilities are served by utilities which generate electricity principally from coal, hydroelectric and nuclear power.

ENVIRONMENTAL AND TOXIC SUBSTANCES CONTROLS

The establishment and implementation of federal, state and local standards to regulate air, water and land quality have affected and will continue to affect substantially all of our manufacturing locations. Federal legislation providing for regulation of the manufacture, transportation, use and disposal of hazardous and toxic substances has imposed additional regulatory requirements on industry, particularly the chemicals industry. In addition, implementation of environmental laws, such as the Resource Conservation and Recovery Act and the Clean Air Act, has required and will continue to require new capital expenditures and will increase operating costs. We employ waste minimization and pollution prevention programs at our manufacturing sites and we are a party to various governmental and private environmental actions associated with waste disposal sites and manufacturing facilities. Charges to income for investigatory and remedial efforts were material to operating results in the past three years and may be material to net income in future years.

See our discussion of our environmental matters in Item 3, “Legal Proceedings” below, the Note “Environmental” of the Notes to Consolidated Financial Statements contained in Item 8, and Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

ADDITIONAL FACTORS THAT MAY AFFECT FUTURE RESULTS

In addition to the other information in this Form 10-K, the following factors should be considered in evaluating Olin and our business. All of our forward-looking statements should be considered in light of these factors. Additional risks and uncertainties that we are unaware of or that we currently deem immaterial also may become important factors that affect us.

Sensitivity to Global Economic Conditions and Cyclicality—Our operating results could be negatively affected during economic downturns.

The business of most of our customers, particularly our automotive, coinage, electrical connectors, telecommunications and housing customers, are, to varying degrees, cyclical and have historically experienced periodic downturns. These economic and industry downturns have been characterized by diminished product demand, excess manufacturing capacity and, in some cases, lower average selling prices. Therefore, any significant downturn in our customers’ businesses or in global economic conditions could result in a reduction in demand for our products and could adversely affect our results of operations or financial condition. As a result of the depressed economic conditions beginning in the fourth quarter of 2000 and continuing through the first half of 2002, our vinyls, urethanes and pulp and paper customers had lower demand for our chlor alkali products. Our coinage, electronic and telecommunications customers had lower demand for our Metals products beginning in the fourth quarter of 2000 and continuing through 2003. Lower demand in our Metals segment adversely affected our business and results of operations in 2001, 2002, and 2003, compared to 2000 and lower demand in our Chlor Alkali Products Segment adversely affected our business and results of operations in 2001 and 2002, compared to 2000. The rod industry has been negatively affected by

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continued reductions in capital spending in the industrial machinery segment and reduced demand for building and household products as a result of declines in commercial construction.

Although we do not generally sell a large percentage of our products directly to customers abroad, a large part of our financial performance is dependent upon a healthy economy beyond the United States. Our customers sell their products abroad. As a result, our business is affected by general economic conditions and other factors in Western Europe and most of East Asia, particularly China and Japan, including fluctuations in interest rates, customer demand, labor costs and other factors beyond our control. The demand for our customers’ products, and therefore, our products, is directly affected by such fluctuations. Our joint venture, Yamaha-Olin Metal Corporation, located in Japan, is particularly susceptible to these fluctuations. We cannot assure you that events having an adverse effect on the industries in which we operate will not occur or continue, such as a further downturn in the Western European, Asian or world economies, increases in interest rates, unfavorable currency fluctuations or a prolonged slowdown in the coinage, electronic or telecommunications industries.

The terrorist attacks of September 11th created many economic and political uncertainties and have had a negative impact on the global economy. The long-term effects of these attacks on our future operating results and financial condition are unknown. The national and international responses to terrorist attacks and the potential for additional terrorist attacks or similar events could have further material adverse effects on the economy in general, on our industry and on our operations. For example, war with one or more countries could have numerous consequences for us and our customers, one of which may be sustained high energy prices.

Cyclical Pricing Pressure—Our profitability could be reduced by declines in average selling prices of our products, particularly declines in the ECU netback (gross price less freight and discounts).

Our historical operating results reflect the cyclical and sometimes volatile nature of the chemical, metals and ammunition industries. We experience cycles of fluctuating supply and demand in each of our business segments, particularly in Chlor Alkali Products which results in changes in selling prices. Periods of high demand, tight supply and increasing operating margins tend to result in increased capacity and production until supply exceeds demand, generally followed by periods of oversupply and declining prices. The industry build cycle, and its impact on industry pricing, has been most pronounced in our Chlor Alkali Products segment. For example, in 1995 and 1996, the chlor alkali industry was very profitable due to a tight supply/demand balance, which resulted in both higher operating rates and higher ECU prices. Higher profits led to reinvestment to expand capacity. This new capacity became operational in 1998 and 1999, resulting in industry over-capacity. This imbalance was exacerbated by falling demand as a result of the Asian financial crisis. The supply/demand imbalance resulted in both lower operating rates and lower ECU prices, and in 1999, many chlor alkali producers had operating losses. The supply/demand balance improved due to improved economic conditions in 2000 compared to 1999, and ECU prices increased in 2000 compared to 1999. As the U.S. and world economies deteriorated in 2001 and through the first half of 2002, the chlor alkali industry again experienced a period of oversupply because of lower industry demand for both chlorine and caustic. Another factor impacting demand for chlorine and caustic soda is the price of natural gas. Higher natural gas prices, which recently have exceeded $5 per million British thermal units, increase our customers’ manufacturing costs, make them less competitive in world markets and, therefore, may result in reduced demand for our products.

Price in the chlor alkali industry is a major supplier selection criterion. We have little or no ability to influence prices in this large commodity market. Decreases in the average selling prices of our products could have a material adverse effect on our profitability. For example, assuming all other costs remain constant, a $10 change in our ECU netback causes a corresponding $12 million increase or decrease in our annual revenues and pre-tax profits, when we are operating at full capacity. While we strive to maintain or increase our profitability by reducing costs through improving production efficiency, emphasizing higher margin products, and by controlling selling and administration expenses, we cannot assure you that these efforts will be sufficient to offset fully the effect of changes in pricing on operating results.

Because of the cyclical nature of our businesses, we cannot assure you that pricing or profitability in the future will be comparable to any particular historical period, including the most recent period shown in our operating results. We cannot assure you that the chlor alkali industry will not experience adverse trends in the future, or that our operating results and/or financial condition will not be adversely affected by them.

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Our Metals and Winchester segments are also subject to changes in operating results as a result of cyclical pricing pressures, but to a lesser extent than the Chlor Alkali Products segment. We generally pass changes in prices for copper and other metals along to our customers as part of the negotiated price of the finished product in most of our Metals segment product lines. However, our Metals segment experiences manufacturing or pricing pressure with respect to its conversion charges, and we cannot assure you that adverse trends in pricing and margins will not affect operating results in the future. Changes in global supply/demand for copper and copper alloys may affect our ability to obtain raw materials under reasonable terms and conditions which may materially adversely affect our operating results. Similarly, selling prices of ammunition are affected by changes in raw material costs and availability and customer demand, and declines in average selling prices of our Winchester segment could adversely affect our profitability.

Indebtedness—Our indebtedness could adversely affect our financial condition, limit our ability to grow and compete and prevent us from fulfilling our obligation under our indebtedness.

As of December 31, 2003, we had approximately $328 million of indebtedness outstanding, excluding our guarantee of $85 million of indebtedness of our Sunbelt joint venture. This does not include our $140 million senior credit facility on which we had $107 million available on that date. As of December 31, 2003, our indebtedness represented 65% of our total capitalization.

Our indebtedness could adversely affect our financial condition, limit our ability to grow and compete and prevent us from fulfilling our obligations under our indebtedness. Despite our level of indebtedness, our senior credit facility and our existing indentures permit us to borrow additional money. If we borrow more money, the risks related to our indebtedness could be increased significantly.

Debt Service—We may not be able to generate sufficient cash to service our debt, which may require us to refinance our indebtedness or default on our scheduled debt payments.

Our ability to generate sufficient cash flow from operations to make scheduled payments on our debt depends on a range of economic, competitive and business factors, many of which are outside our control. We cannot assure you that our business will generate sufficient cash flow from operations. If we are unable to meet our expenses and debt obligations, we may need to refinance all or a portion of our indebtedness on or before maturity, sell assets or raise equity. We cannot assure you that we would be able to refinance any of our indebtedness, sell assets or raise equity on commercially reasonable terms or at all, which could cause us to default on our obligations and impair our liquidity. Our inability to generate sufficient cash flow to satisfy our debt obligations, or to refinance our obligations on commercially reasonable terms, would have an adverse effect on our business, financial condition and results of operations, as well as on our ability to satisfy our debt obligations. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

After taking into consideration our interest-rate swaps which convert our fixed rate debt to a variable rate, at December 31, 2003, approximately 43% of our indebtedness bears interest at variable rates that are linked to short-term interest rates. If interest rates rise, our costs relative to those obligations would also rise.

Imbalance in Demand for Our Chlor Alkali Products—A loss of a substantial customer for our chlorine or caustic soda could cause an imbalance in demand for these products, which could have an adverse effect on our results of operations.

Chlorine and caustic soda are produced simultaneously and in a fixed ratio of 1.0 ton of chlorine to 1.1 tons of caustic soda. The loss of a substantial chlorine or caustic soda customer could cause an imbalance in demand for our chlorine and caustic soda products. An imbalance in demand may require us to reduce production of both chlorine and caustic soda or take other steps to correct the imbalance. Since we cannot store chlorine, we may not be able to respond to an imbalance in demand for these products as quickly or efficiently as some of our competitors. If a substantial imbalance occurred, we would need to reduce prices or take other actions that could have a negative impact on our results of operations and financial condition.

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Competition—We face competition from other chemical, metals and ammunition companies, including the migration by United States customers to low-cost foreign locations, which could adversely affect our revenues and financial condition.

We are in active competition with companies producing the same or similar products, as well as, in some instances, with companies producing different products designed for the same uses. With respect to certain product groups, such as ammunition, copper alloys and brass rod, and with respect to certain chlor alkali products, we are among the largest manufacturers or distributors in the United States. We encounter competition in price, delivery, service, securing and maintaining customers, performance, technology, product innovation, and product recognition and quality, depending on the product involved. Our customers could decide to move some or all of their production to lower cost, offshore locations and this could reduce demand in the United States for our products. With respect to certain products, some of our competitors are larger, have greater financial resources and have less debt than we do. As a result, these competitors may be better able to withstand a change in conditions within the industries in which we operate and throughout the economy as a whole. If we do not compete successfully, our business, financial condition and results of operations could be adversely affected.

Environmental Costs—We have ongoing environmental costs, which could materially adversely affect our financial position or results of operations.

The nature of our operations and products, including the raw materials we handle, exposes us to the risk of liabilities or claims with respect to environmental matters. We have incurred, and will continue to incur, significant costs and capital expenditures in complying with environmental laws and regulations.

The ultimate costs and timing of environmental liabilities are difficult to predict. Liability under environmental laws relating to contaminated sites can be imposed retroactively and on a joint and several basis. One liable party could be held responsible for all costs at a site, regardless of fault, percentage of contribution to the site or the legality of the original disposal. We could incur significant costs, including cleanup costs, natural resources damages, civil or criminal fines and sanctions and third-party lawsuits claiming, for example, personal injury and/or property damage, as a result of past or future violations of, or liabilities under, environmental or other laws.

In addition, future events, such as changes to or more rigorous enforcement of environmental laws, could require us to make additional expenditures, modify or curtail our operations and/or install pollution control equipment.

Accordingly, it is possible that some of the matters in which we are involved or may become involved may be resolved unfavorably to us, which could materially adversely affect our financial position or results of operations. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations-Environmental Matters.”

Cost Control—Our profitability could be reduced if we experience higher-than-expected raw material, utility, transportation or logistics costs, or if we fail to achieve our targeted cost reductions.

Our operating results and profitability are dependent upon our continued ability to control, and in some cases further reduce, our costs. If we are unable to do so, or if costs outside of our control, particularly our costs of raw materials, utilities, transportation and similar costs increase beyond anticipated levels, our profitability will decline.

Production Hazards—Our facilities are subject to operating hazards, which may disrupt our business.

We are dependent upon the continued safe operation of our production facilities. Our production facilities are subject to hazards associated with the manufacture, handling, storage and transportation of chemical materials and products and ammunition, including leaks and ruptures, explosions, fires, inclement weather and natural disasters, unexpected utility disruptions or outages, unscheduled downtime and environmental hazards. From time to time in the past, we have had incidents that have temporarily shut down or otherwise disrupted our manufacturing, causing production delays and resulting in liability for workplace injuries and fatalities. Some of our products involve the manufacture and/or handling of a variety of explosive and flammable materials. Use of these products by our customers could also result in liability if an explosion, fire, spill or other accident were to occur. We cannot assure you that we will not experience these types of incidents in the future or that these incidents will not result in production delays or otherwise have a material adverse effect on our business, financial condition or results of operations.

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Labor Matters—We cannot assure you that we can conclude future labor contracts or any other labor agreements without work stoppages.

Various labor unions represent a majority of our hourly-paid employees for collective bargaining purposes. Although some labor contracts extend for as long as six years, others are for shorter periods. A labor contract for approximately 210 employees at the Chlor Alkali Products facility in McIntosh, Alabama expires in April 2004 and a labor contract for approximately 235 employees at the Metals facility in Montpelier, Ohio expires in June 2004. While we believe our relations with our employees and their various representatives are generally satisfactory, we cannot assure you that we can conclude future labor contracts or any other labor agreements without work stoppages.

Tax Audits—We are currently subject to ongoing tax audits, which may result in additional tax payments.

We are currently subject to ongoing audits by the Internal Revenue Service in connection with our Federal tax returns for the years from 1992 to 2000; however, we have closed all tax years through 1991. Depending on the outcome of these audits, we may be required to pay additional taxes, and any additional taxes and related interest could be substantial. We have reserved amounts which we believe will be sufficient for any adverse outcome. The timing of any such payments is uncertain.

Pension Plans—Declines in global equity markets on asset values and any declines in interest rates used to value the liabilities in our pension plan may result in higher pension costs and the need to fund the pension plan in future years, earlier than expected.

Under Statement of Financial Accounting Standards (SFAS) No. 87, we recorded a $220 million after-tax charge ($360 million pretax) to Shareholders’ Equity as of December 31, 2002, reflecting an accumulated benefit obligation in excess of the year-end market value of assets of our pension plan. In 2003, the decline in interest rates more than offset a significant rebound in the value of the plan’s assets, which necessitated the recording of an additional after-tax charge to shareholders’ equity of $20 million ($32 million pretax). This is a non-cash charge and does not affect our ability to borrow under our revolving credit agreement.

Based on our assumptions and estimates, including historical plan experience and assumptions regarding the future and the $125 million voluntary contribution from the proceeds of our offering of 10 million shares of common stock, we may be required to make additional contributions to the pension fund. For 2004, we estimate that our non-cash pension pretax expense will be approximately $10 million higher than 2003 ($2.5 million per quarter) versus $20 million higher had we not made the $125 million voluntary contribution, and that pension expense will continue to increase by about $10 million per year over the next few years.

Security and Chemicals Transportation—New regulations on the transportation of hazardous chemicals and/or the security of chemical manufacturing facilities in response to the increased terrorist threat post September 11th could result in significantly higher operating costs.

The chemical industry, including the chlor alkali industry, has proactively responded to the issues surrounding the events of September 11, 2001 by starting new initiatives relating to the security of chemicals industry facilities and the transportation of hazardous chemicals in the United States. Simultaneously, government at the local, state and federal levels has begun the regulatory process which could lead to new regulations that would impact the security of chemical plant locations and the transportation of hazardous chemicals. Our Chlor Alkali business could be adversely impacted because of either an incident or the cost of complying with new regulations. The extent of the impact would depend on the consequences of an incident and the nature and direction of future regulations, which are unknown at this time.

Litigation and Claims—We are subject to litigation and other claims, which could cause us to incur significant expenses.

We are a defendant in a number of pending legal proceedings relating to our present and former operations. These include proceedings alleging injurious exposure of plaintiffs to various chemicals and other substances (including proceedings based on alleged exposures to asbestos, perchlorate and vinyl chloride). Frequently, such proceedings involve claims made by numerous plaintiffs against many defendants. We believe we have valid defenses

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to these proceedings and are defending them vigorously. However, because of the inherent uncertainties of litigation, we are unable to predict the outcome of these proceedings and therefore cannot determine whether the financial impact, if any, will be material to our financial position or results of operations.

Changes in Laws and Regulations—We are subject to a variety of existing laws and regulations that affect our business.

We are unable to determine what effect, if any, the impact of changes in existing or new laws and regulations and the associated compliance costs may have on our operating results.

Item 2. PROPERTIES

We have manufacturing sites at 21 separate locations in 12 states and Puerto Rico and two manufacturing sites and a distribution facility in three foreign countries. In addition, a metals service center in China is expected to be operational in the first quarter of 2004. Most manufacturing sites are owned although a number of small sites are leased. We listed the locations at or from which our products and services are manufactured, distributed or marketed in the tables set forth under the caption “Products and Services.”

We lease warehouses, terminals and distribution offices and space for executive and branch sales offices and service departments throughout the world.

Item 3. LEGAL PROCEEDINGS

(a) We completed the work of covering certain former waste ponds in 2003 in connection with remediation of mercury contamination at the site of our former mercury cell chlor alkali plant in Saltville, Virginia, and have now completed all remediation work required to date.

We have met with the site’s Natural Resources Trustees at the Trustees’ request regarding past releases from the Saltville site and the nearby North Fork of the Holston River. In mid-2003, the Trustees for natural resources in the North Fork of the Holston River, the Main Stem Holston River, and associated floodplains, located in Smyth and Washington Counties in Virginia, and in Sullivan and Hawkins Counties in Tennessee notified us of, and invited our participation in, an assessment of alleged injuries to natural resources resulting from the release of mercury. The Trustees also notified us that they have made a preliminary determination that we are potentially liable for natural resource damages in said rivers and floodplains. In light of the early stage, and inherent uncertainties, of the assessment, we cannot at this time determine whether the financial impact, if any, of this matter will be material to our financial position or results of operations. See “Environmental Matters” contained in Item 7—“Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

(b) As part of the continuing environmental investigation by federal, state and local governments of waste disposal sites, we have entered into a number of settlement agreements requiring us to contribute to the cost of the investigation and cleanup of a number of sites. We expect this process of investigation and cleanup to continue. See “Environmental Matters” contained in Item 7—“Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

(c) As a result of an internal audit of our East Alton, Illinois facility, we questioned whether recent upgrades to certain operations were completed in full compliance with certain USEPA air emissions regulations. Although our facility received a modification to its air emissions permit from the Illinois Environmental Protection Agency, or IEPA, for the upgrades, the permit modification may not have addressed or completely addressed all applicable regulations. On February 15, 2002, we disclosed to USEPA and IEPA that the upgrades may not have been in compliance with all aspects of USEPA regulations. Upon further review, we submitted a report to IEPA in June 2002, discussing our analysis of the regulations applicable to the upgrades. We have offered to work with USEPA and IEPA to determine the nature and extent of the issues and to correct them, if necessary. As part of the resolution of this issue, we may need to enhance pollution control equipment at our East Alton facility and pay some penalty. We do not expect that the ultimate resolution of this matter will have a material impact on our financial position, or on our results of operations.

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(d) We and our subsidiaries are defendants in various other legal actions (including proceedings based on alleged exposures to asbestos, perchlorate and vinyl chloride) incidental to our past and current business activities. While we believe that none of these legal actions will materially impact our financial position, in light of the inherent uncertainties of the litigation concerning alleged exposures, we cannot at this time determine whether the financial impact, if any, of these matters will be material to our results of operations.

In particular, we have been named as defendant in a number of similar legal actions (including several proposed class actions) filed in 2003 and 2004 in federal and state court in San Jose, California relating to alleged groundwater contamination arising from perchlorate use between 1956 and 1996 by Olin and another, unrelated, defendant at an Olin facility in Morgan Hill, California. We are working with California state regulatory authorities to determine the scope of potential contamination. We are vigorously defending these suits and opposing any class certification.

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

We did not submit any matter to a vote of security holders during the three months ended December 31, 2003.

Executive Officers as of February 29, 2004

No family relationship exists between any of the above named executive officers or between any of them and any of our Directors. Such officers were elected to serve, subject to the By-laws, until their respective successors are chosen.

Each of the above-named executive officers, except M. E. Gallagher and G. H. Pain, has served as an executive officer for not less than the past five years.

Mary E. Gallagher was elected a Corporate Vice President on April 27, 2000. She was elected Controller on April 29, 1999. Prior to that time, and since she joined Olin in May 1996, she served as Director, Accounting and Financial Reporting. Prior to joining Olin, she served as a Senior Manager with KPMG LLP.

George H. Pain joined Olin on April 15, 2002 as Vice President, General Counsel and Secretary. Prior to the time, since 2001, he served as Vice President and General Counsel of General Dynamics Ordnance and Tactical Systems, Inc., an operating unit of General Dynamics Corporation. From 1997-2001, he served as Vice President, General Counsel and Secretary of Primex Technologies, Inc.

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PART II

As of January 31, 2004, we had approximately 6,780 record holders of our common stock.

Our common stock is traded on the New York Stock Exchange, Chicago Stock Exchange and Pacific Exchange, Inc.

The high and low sales prices of our common stock during each quarterly period in 2003 and 2002 are listed below. A dividend of $0.20 per common share was paid during each of the four quarters in 2003 and 2002.