OLN Olin Corp - 10-K

Item 1A.  RISK FACTORS

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. The following summarizes the risks and uncertainties that we consider to be material and that may adversely affect our business, financial condition, results of operations, cash flows and/or reputation. Additional risks and uncertainties that we are unaware of or that we currently deem immaterial also may become important factors that affect us.

Business, Industry and Operational Risks

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

Our industries and the businesses of most of our customers have historically experienced periodic downturns. These economic, seasonal 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, industry conditions, or in global economic conditions could result in reduced demand for our products or our customers’ products.

Although a majority of our sales are within North America, a large part of our financial performance is dependent upon a healthy global economy as we, along with our customers, participate in global markets and sell products abroad. As a result, our business is and will continue to be affected by general economic and business conditions in Europe, Asia Pacific, particularly China, and Latin America, as well as within North America. External factors include inflation and fluctuations in interest rates, tariffs and trade barriers, customer demand, labor and energy costs, currency changes, new capacity additions, increased utilization of current capacity, competitor actions, political conflicts, public health epidemics, and other factors beyond our control. The demand for our products and our customers’ products is directly affected by such fluctuations. In addition, our customers could decide to move some or all of their production to locations that are more remote from our facilities, or to another supplier, and this could reduce demand for our products.

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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 downturn in the European, Asian Pacific, particularly Chinese, Latin American, or other world economies, increases in or persistently high interest rates, unfavorable currency fluctuations or prolonged effects of global public health crises, including pandemics. Economic conditions in other regions of the world, predominantly Asia and Europe, can adversely affect the balance between global supply and demand for our chemical products and increase the amount of products produced and made available for export to North America and other jurisdictions in which we sell. Any significant increased product supply could put downward pressure on our product pricing, negatively affecting our profitability.

Cyclical Pricing Pressure—Our profitability could be reduced by declines in average selling prices of our products.

Our historical operating results reflect the cyclical and sometimes volatile nature of the chemical and ammunition industries. We experience cycles of fluctuating supply and demand, particularly in our Chlor Alkali Products and Vinyls segment, which can result in changes in selling prices. Periods of high demand, tight supply and increasing operating margins tend to result in increases in capacity and production until supply exceeds demand, generally followed by periods of oversupply and declining prices. We believe our operating model can mitigate pricing pressure historically experienced during periods of supply exceeding demand. Nevertheless, we cannot assure you that increased pricing pressure will not affect our operating results in the future during these periods. Another factor influencing demand and pricing for chemical products is the price of energy. Higher natural gas prices increase our customers’ and competitors’ manufacturing costs and depending on the ratio of crude oil to natural gas prices, could make our customers less competitive in global markets, negatively affecting the demand and pricing for our chemical products.

In the chemical industries in which we operate, price is one of the major supplier selection criteria. Pricing is subject to a variety of factors, some of which are outside of our control. Decreases in the average selling prices of our products could have a material adverse effect on our profitability. While we strive to maintain or increase our profitability by executing our operating model and by reducing costs through improving production efficiency, emphasizing higher margin products and by controlling transportation, selling and administrative expenses, we cannot assure you that these efforts will be sufficient to fully offset the effect of possible decreases in pricing on operating results.

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. An imbalance in customer demand may require Olin to reduce production of both chlorine and caustic soda or take other steps to correct the imbalance. Since we cannot store large quantities of chlorine, we may not be able to respond to an imbalance in customer demand for these products quickly or efficiently. To mitigate exposure and maximize value from the entire ECU, we continually take a number of actions, including managing our production rates to the prevailing weaker side of the ECU, leveraging our portfolio of chlorine and chlorine derivatives outlets and entering into purchase for re-sale transactions. If our efforts are not successful and a substantial imbalance occurred, we might need to take actions that could have a material adverse effect on our business.

Our Epoxy segment is also subject to changes in operating results as a result of pricing pressures. Selling prices of epoxy materials are affected by changes in raw material costs, including energy, propylene and cumene, customer demand, and global fluctuations in supply and demand. Periods of supply and demand imbalances, particularly changes in trade flows within Asia Pacific markets, particularly China, can result in increased pricing pressure on our epoxy products. Declines in average selling prices of products of our Epoxy segment could have a material adverse effect on our business.

Our Winchester segment is also subject to pricing pressures. Selling prices of ammunition are affected by changes in raw material costs and availability, customer demand and industry production capacity. Declines in average selling prices of products of our Winchester segment could have a material adverse effect on our business.

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 chemical industry or ammunition industry will not experience adverse trends in the future.

Operating Model—Our operating results could be negatively affected if we do not successfully execute our operating model in our chemicals businesses.

Our operating model in our chemicals businesses, which emphasizes a disciplined value-first commercial approach, prioritizes ECU margins over sales volume. To mitigate exposure and maximize value from the entire ECU, our operating model necessitates managing production rates to preserve value, which may impact the way we transact business with customers and other third parties. The execution of the model may not be successful over time. For example, we may not be able to consistently achieve higher margins compared to previous industry or business cycles, customers may not be willing to transact with us on terms acceptable to us, or the margin improvement achieved might be more than offset by the impact from lower sales volumes, any of which could have a material adverse effect on our business.

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In addition, we take actions from time to time designed to complement our operating model, such as purchase for re-sale transactions that may not improve our operating results and could adversely affect our business if these activities are not successfully implemented.

Some of our assets were designed to operate at consistently high operating rates. If we operate at lower operating rates for extended periods or make frequent changes to operating rates, our assets may become less reliable or may require additional maintenance or capital investment, which could have a material adverse effect on our business.

If we fail to effectively execute our operating model, our operating results may fail to achieve the level of profitability that we forecast, and our business could be adversely affected.

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

Our operating results and profitability are dependent upon our continued ability to control, and in some cases 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. In addition, an increase in costs generally as a result of heightened inflation, tariffs and trade barriers, political conflicts or other macroeconomic factors, or in a particular sector such as the energy or transportation sector, could result in rising costs which we cannot fully mitigate through product price increases or cost reductions, which could also adversely affect our profitability.

For example, if our feedstock and energy costs increase, and we are unable to pass the increased costs on to customers, our profitability in our Chlor Alkali Products and Vinyls and Epoxy segments would be negatively affected. Similarly, costs of commodity metals and other materials used in our Winchester business, such as copper, propellant, brass and lead, can vary. If we experience significant increases in these costs and are unable to raise our prices to offset the higher costs, the profitability in our Winchester business would be negatively affected.

Our profitability and margin growth will depend in part on our ability to maintain an efficient operating model and drive sustainable improvements, through productivity, reliability and modernization actions and projects, such as rightsizing our global asset base, product line rationalizations, renegotiating supplier contracts and facility modernization projects. A variety of factors may adversely affect the Company’s ability to realize targeted cost reductions, including failure to successfully optimize our facilities footprint, failure to take advantage of our vertically integrated product lines and global supply chains, or the failure to identify and eliminate duplicative programs. There can be no assurance that we will be able to achieve or sustain any or all of the cost savings generated from our actions and initiatives, and our business could be adversely affected.

Raw Materials—Availability of purchased feedstocks and energy, and the volatility of these costs, affect our operating costs and add variability to earnings.

Energy costs and purchased feedstock, including propylene, cumene and ethylene, account for a substantial portion of our total production costs and operating expenses. We purchase certain raw materials as feedstocks.

Energy costs and feedstock generally follow price trends in crude oil and natural gas, which are sometimes volatile. Ultimately, the ability to pass on underlying cost increases in a timely manner or at all is partially dependent on market conditions. Conversely, when feedstock and energy costs decline, selling prices generally decline as well. As a result, volatility in these costs could have a material adverse effect on our business.

If the availability of any of our principal feedstocks is limited or we are unable to obtain natural gas or energy from any of our energy sources, we may be unable to produce some of our products in the quantities demanded by our customers, which could have a material adverse effect on plant utilization and our sales of products requiring such raw materials. We have long-term supply contracts with various third parties for certain raw materials, including electricity, propylene, ethylene and cumene. As these contracts expire, we may be unable to renew these contracts or obtain new long-term supply agreements on terms comparable or as favorable to us, depending on market conditions, which may have a material adverse effect on our business. In addition, many of our long-term contracts contain provisions that allow our suppliers to limit the amount of raw materials shipped to us below the contracted amount in force majeure or similar circumstances. If we are required to obtain alternate sources for raw materials because our suppliers are unwilling or unable to perform under raw material supply agreements or if a supplier terminates or is unwilling to renew its agreements with us, we may not be able to obtain these raw materials from alternative suppliers or obtain new long-term supply agreements on terms comparable or as favorable to us.

Suppliers—We rely on a limited number of third-party suppliers for specified feedstocks and services.

We obtain a significant portion of our raw materials from a few key suppliers. If any of these suppliers fail to meet their obligations under present or any future supply agreements, we may be forced to pay higher prices or incur higher costs to obtain the necessary raw materials. Any interruption of supply or any price increase of raw materials could have a material adverse effect on our business. Certain of our facilities are dependent on feedstocks, services, and related infrastructure provided by

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third parties, which are provided pursuant to long-term contracts. Any failure of those third parties to perform their obligations under those agreements or disagreements regarding the performance under those agreements or inability to renew such agreements at acceptable terms could adversely affect the operation of the affected facilities and our business, or result in diversion of management’s attention or our resources from other business matters. If we are required to obtain an alternate source for these feedstocks or services, we may not be able to obtain equally favorable pricing and terms. Additionally, we may be forced to pay additional transportation costs or to invest in capital projects for pipelines or alternate facilities to accommodate railcar or other delivery methods or to replace other services. The impact of microeconomic factors such as tariffs and trade barriers and political conflicts, particularly with suppliers of ours that operate internationally, may lead to further supply chain constraints.

Subject to existing contracts, a vendor may choose to modify its relationship with us due to general economic concerns or concerns relating to the vendor or us, at any time. Any significant change in the terms that we have with our key suppliers could have a material adverse effect on our business, as could significant additional requirements from suppliers that we provide them additional security in the form of prepayments or posting letters of credit.

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

We are dependent upon the continued safe and reliable 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, equipment failure, information technology systems interruptions or failures, terrorism, transportation interruptions, transportation incidents involving our chemical products, chemical spills and other discharges or releases of toxic or hazardous substances or gases and environmental hazards. Due to the integrated nature of our large chemical sites, an event at one plant could affect production across multiple plants at a facility. 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 operations involve manufacturing and/or handling various explosive and flammable materials. Use of our 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.

We maintain risk management strategies, including but not limited to levels of insurance associated with property, casualty and business interruption. Such insurance may not cover all of the risks associated with the hazards of our business and is subject to limitations, including deductibles and maximum liabilities covered. We may incur losses beyond the limits, or outside the coverage, of our insurance policies. We may also be unable to continue to maintain our existing insurance or obtain comparable insurance at a reasonable cost.

Physical Risk of Climate-Related Events—Our facilities are subject to physical risks associated with climate-related events or increased severity and frequency of severe weather events.

We are exposed to climate-related risks and uncertainties, many of which are outside of our control. We have a substantial presence near the U.S. Gulf Coast and a significant portion of our manufacturing facilities, similar to our competitors and customers, are structured near major bodies of water. Major hurricanes, or other weather-related events, have caused significant disruption in our operations on the U.S. Gulf Coast, logistics across the region and the supply of certain raw materials, which have had an adverse effect on volume and cost for some of our products. More frequent severe weather events or potential changes in precipitation patterns and extreme variability in weather patterns could disrupt our operations in the U.S. Gulf Coast, or elsewhere, as well as those of our customers and suppliers. Severe weather conditions or other natural phenomena in the future could have a material adverse effect on our business.

Third-Party Transportation—We rely heavily on third-party transportation, which subjects us to risks and costs that we cannot control.

We rely heavily on railroad, truck, marine vessel, barge and other shipping companies to transport finished products to customers and to transport raw materials to the manufacturing facilities used by each of our businesses. These transport operations are subject to various hazards and risks, including extreme weather conditions, work stoppages and operating hazards, as well as domestic and international transportation and maritime regulations. In addition, the methods of transportation we utilize, including shipping chlorine and other chemicals by railroad and by barge, may be subject to additional, more stringent and more costly regulations in the future. If we are delayed or unable to ship finished products or unable to obtain raw materials as a result of any such new or modified regulations or public policy changes related to transportation safety, or these transportation companies’ failure to operate properly, or if there are significant changes in the cost of these services due to industry consolidation, new additional regulations, or otherwise, we may not be able to arrange efficient alternatives and timely means to obtain raw materials or ship goods, which could result in a material adverse effect on our business. If any third-party railroad that we utilize to transport chlorine and other chemicals ceases to transport certain

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hazardous materials, or if there are significant changes in the cost of shipping hazardous materials by rail or otherwise, we may not be able to arrange efficient alternatives and timely means to deliver our products or at all, which could result in a material adverse effect on our business.

Information Security—A failure of our information technology systems, or an interruption in their operation due to internal or external factors, including cyber-attacks, could have a material adverse effect on our business.

Our operations depend on our ability to protect our information technology systems, computer equipment and information databases from systems failures or interruptions. We rely on both internal information technology systems and certain external service providers to assist in the management of the day-to-day operation of our business, operate elements of our manufacturing facilities, manage relationships with our employees, customers and suppliers, fulfill customer orders and maintain our financial, accounting or other business records. Failure or interruption of one, or more than one, of our information technology systems to perform as anticipated could be caused by internal or external events or parties, such as incursions by intruders or hackers, computer viruses, cyber-attacks, failures in hardware or software, or power or telecommunication fluctuations or failures. The failure of our information technology systems to perform as anticipated for any reason, or any significant breach of our systems’ security, could disrupt our business and result in numerous adverse consequences, including reduced effectiveness and efficiency of operations, increased costs or loss of important information, or loss of sales, any of which could have a material adverse effect on our business. We have technology and information security processes, periodic external service and service provider reviews, insurance policies and disaster recovery plans in place to mitigate our risk to these vulnerabilities. However, these measures may not be adequate to ensure that our operations will not be disrupted or our financial impact minimized, should such an event occur. We have experienced cyber incidents in the past and, although we do not believe any have been material, we may experience cybersecurity incidents and security breaches in the future. Our cybersecurity risk management strategy is detailed within Item 1C. - “Cybersecurity.”

International Sales and Operations—We are subject to risks associated with our international sales and operations that could have a material adverse effect on our business.

Olin has an international presence, including the geographic regions of Europe, Asia Pacific, Latin America and Canada. In 2025, approximately 32% of our sales were generated outside of the United States. These international sales and operations expose us to risks, including:

• difficulties and costs associated with complying with complex and varied laws, treaties, and regulations;

• tariffs and trade barriers, including any retaliatory trade policies in response thereto, and the associated impact on trade flows and supply/demand fundamentals;

• outbreaks of serious disease, such as pandemics, which could cause us and our suppliers and/or customers to temporarily suspend operations in affected areas, restrict the ability of Olin to distribute our products or cause economic downturns that could affect demand for our products;

• geopolitical or regional conflicts which can disrupt trade flows, supply/demand fundamentals, or the ability to sell certain products within countries or regions;

• changes in laws and regulations, including the imposition of economic or trade sanctions affecting international commercial transactions;

• risk of non-compliance with anti-bribery laws and regulations, such as the U.S. Foreign Corrupt Practices Act, and export control laws and regulations;

• restrictions on, or difficulties and costs associated with, the repatriation of cash from foreign countries to the United States;

• unfavorable currency fluctuations;

• changes in local economic conditions, including inflation levels exceeding that of the U.S.;

• unexpected changes in political or regulatory environments;

• labor compliance and costs associated with a global workforce;

• data privacy regulations;

• difficulties in maintaining overseas subsidiaries and international operations; and

• challenges in protecting intellectual property rights.

Any one or more of the above factors could have a material adverse effect on our business.

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Credit Facility—Adverse industry or business conditions impacting our profitability could affect our ability to comply with the covenants and restrictions in our debt agreements.

Our Senior Secured Revolving Credit Facility (see ‘Indebtedness’ below), and other debt instruments, include certain financial maintenance covenants requiring us to not exceed a maximum net leverage ratio and to maintain a minimum coverage ratio. Our inability to comply with these or other covenants and restrictions in our current and future debt agreements could result in an event of default, including cross-defaults to other debt facilities, if not cured or waived.

Unfavorable industry or business conditions may have a material adverse effect on our business and profitability and depending on the magnitude and duration of the impact, may affect our ability to maintain compliance with these ratios. If we fail to comply with any of these covenants in a future period and are not able to obtain waivers from, or enter into an agreement with, our lenders, we would need to refinance our debt, or our ability to borrow may be limited. However, there can be no assurance that such refinancing would be available to us, or that the terms would be acceptable.

Indebtedness—Our indebtedness could materially adversely affect our business.

As of December 31, 2025, we had $2,827.3 million of indebtedness outstanding. Outstanding indebtedness does not include amounts that could be borrowed under our 2025 revolving credit facility with aggregate commitments of $1,200.0 million (2025 Revolving Credit Facility), which was amended on February 19, 2026 which, among other things, modified the financial covenants to be less restrictive and incorporated guarantees and collateral by certain of our domestic subsidiaries. Additional information with respect to our credit facility amendment is contained in Part II, Item 8—“Financial Statements and Supplementary Data,” under the heading “Subsequent Event” within Note 11, “Debt,” of our notes to consolidated financial statements. As of December 31, 2025, our indebtedness represented 60.2% of our total capitalization and $109.7 million of our indebtedness was due within one year. Despite our level of indebtedness, we expect to continue to have the ability to borrow additional debt, but we cannot be certain that additional debt will be available on terms acceptable to us or at all.

Our indebtedness could have important consequences, including but not limited to:

• limiting our ability to fund working capital, capital expenditures, and other general corporate purposes;

• limiting our ability to accommodate growth, including acquisitions, by reducing funds otherwise available for other corporate purposes, which in turn could prevent us from fulfilling our obligations under our indebtedness;

• limiting our operational flexibility due to the covenants contained in our debt agreements;

• to the extent that our debt is subject to floating interest rates, increasing our vulnerability to fluctuations in market interest rates;

• limiting our ability to pay cash dividends;

• limiting our ability to approve or execute share repurchase programs;

• adversely affecting our credit ratings which could increase our future costs of funding, liquidity and access to capital markets;

• limiting our flexibility for, or reacting to, changes in our business or industry or economic conditions, thereby limiting our ability to compete with companies that are not as highly leveraged; and

• increasing our vulnerability to economic downturns.

Our ability to generate sufficient cash flow from operations to make scheduled payments on our debt will depend on a range of economic, competitive and business factors, many of which are outside our control. There can be no assurance that our business will generate sufficient cash flow from operations to make these payments. If we are unable to meet our expenses and debt obligations, we may need to refinance all or a portion of our indebtedness before maturity, sell assets or issue additional equity. We may not be able to refinance any of our indebtedness, sell assets or issue additional 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 debt obligations on commercially reasonable terms or at all, would have a material adverse effect on our business, as well as on our ability to satisfy our debt obligations.

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 significant number of our hourly paid employees for collective bargaining purposes. In 2026, we have no labor agreements that are due to expire in Canada, and three labor agreements expiring in the U.S., including our East Alton, IL, facility (523 employees) and our Lake City facility in Independence, MO (1,358 employees), representing approximately 24% of our global workforce.

In addition, a large number of our employees are located in countries in which employment laws provide greater bargaining or other rights to employees than the laws of the U.S. Such employment rights require us to work collaboratively with the legal representatives of those employees to effect any changes to labor arrangements. For example, most of our

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employees in Europe are represented by works councils that must approve any changes in conditions of employment, including salaries and benefits and staff changes, and may impede efforts to restructure our workforce. While we believe our relations with our employees and their various representatives are generally satisfactory, we cannot assure that we can conclude any labor agreements without work stoppages and cannot assure you that any work stoppages will not have a material adverse effect on our business.

Ability to Attract and Retain Qualified Employees—We must attract, retain and motivate key employees, and the failure to do so may materially adversely affect our business.

We believe our success depends on the Company’s ability to attract, retain, develop and motivate highly skilled personnel. Our future success depends in part on our ability to identify and develop talent throughout the organization who adopt and successfully execute our strategies and operating model. The development and retention of talented personnel and appropriate senior management succession planning will continue to be important to the successful execution of our strategies.

The Company has experienced, and continues to experience, an increasingly competitive hiring environment for skilled employees at its manufacturing sites. In addition, we may have difficulty retaining such personnel once hired, and key people may leave and compete against us. The loss of key personnel or our failure to attract and retain other qualified and experienced personnel could disrupt or materially adversely affect our business. Our operating results could be adversely affected by increased costs from competition for employees or employee turnover, and may result in the loss of significant customer business or increased costs.

Our success also depends on our ability to recruit and retain our executive officers and senior management. The market for senior leadership in our industry is competitive. We must continue to recruit, retain, and motivate management and other team members sufficiently, both to maintain our current business and to execute our long-term strategic initiatives. The loss of any of our executive officers or other key senior management without sufficient advance notice could prevent or delay the implementation and completion of our strategic initiatives, divert management’s attention to seeking qualified replacements, be disruptive to our daily operations or impact public or market perception. Any failure by us to manage a successful leadership transition of an executive officer and to timely identify a qualified permanent replacement could have a material adverse effect on our business.

Credit and Capital Market Conditions—Adverse conditions in the credit and capital markets may limit or prevent our ability to borrow or raise capital.

While we believe we have facilities in place that should allow us to borrow funds as needed to meet our ordinary course business activities, adverse conditions in the credit and financial markets could prevent us from obtaining financing, on commercially reasonable terms or at all, if the need arises, or result in our creditors terminating their funding commitments. Our ability to invest in our businesses and refinance or repay maturing debt obligations could require access to the credit and capital markets and sufficient bank credit lines to support cash requirements. Our ability to access credit and capital markets can also depend on our credit rating as determined by reputable credit rating agencies. A significant downgrade in our credit rating could affect our ability to refinance or repay maturing debt obligations, result in increased borrowing costs, decrease the availability of capital from financial institutions or require our subsidiaries to post letters of credit, cash or other assets as collateral with certain counterparties. If we are unable to access the credit and capital markets on commercially reasonable terms or at all, we could experience a material adverse effect on our business.

Acquisitions and Joint Ventures—We may not be able to complete future acquisitions or joint venture transactions or successfully integrate them into our business, which could materially adversely affect our business.

As part of our growth strategy, we intend to pursue acquisitions and joint venture opportunities consistent with or complementary to our existing business strategies. Successful accomplishment of this objective may be limited by the availability and suitability of acquisition candidates, the ability to obtain regulatory approvals necessary to complete a planned transaction, and by our financial resources. Acquisitions and joint venture transactions involve numerous risks, including difficulty determining appropriate valuation, integrating operations, technologies, services and products of the acquired businesses, personnel turnover and the diversion of management’s attention from other business matters. The nature of a joint venture requires us to work cooperatively with unaffiliated third parties. Differences in views among joint venture participants may result in delayed decisions or failure to agree on major decisions. If these differences cause the joint ventures to deviate from their business plans or fail to achieve their desired operating performance, our results of operations could be adversely affected. In addition, we may be unable to achieve anticipated benefits from these transactions in the time frame that we anticipate, or at all, which could have a materially adverse effect on our business.

Pension Plans—The impact of declines in global equity and fixed income markets on asset values and any declines in interest rates and/or improvements in mortality assumptions used to value the liabilities in our pension plans may result in higher pension costs and the need to fund the pension plans in future years in material amounts.

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We sponsor domestic and foreign defined benefit pension plans for eligible employees and retirees. Substantially all domestic defined benefit pension plan participants are no longer accruing benefits. However, a portion of our bargaining hourly employees continue to participate in our domestic qualified defined benefit pension plans under a flat-benefit formula. Our funding policy for the qualified defined benefit pension plans is consistent with the requirements of federal laws and regulations. Our foreign subsidiaries maintain pension and other benefit plans, which are consistent with local statutory practices. The determinations of pension expense and pension funding are based on a variety of rules and regulations along with economic factors which are outside of our control. These factors include returns on invested assets, the level of certain market interest rates, the discount rates used to determine pension obligations and mortality assumptions used to value liabilities in our pension plans. Changes in these rules and regulations or unfavorable changes to the factors which are used to value the assets and liabilities in our pension plans could impact the calculation of funded status of our pension plans. They may also result in higher pension costs and the need for additional pension plan funding. See “Pension and Postretirement Benefits” contained in Item 7—“Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Asset Impairment—If our goodwill, other intangible assets or property, plant and equipment become impaired in the future, we may be required to record non-cash charges to earnings, which could be significant.

The process of impairment testing for our goodwill involves a number of judgments and estimates made by management including future cash flows, discount rates, profitability assumptions and terminal growth rates with regards to our reporting units. Our internally generated long-range plan includes assumptions regarding pricing and operating forecasts for the chlor alkali industry. If the judgments and estimates used in our analysis are not realized or are affected by external factors, then actual results may not be consistent with these judgments and estimates, and we may be required to record a goodwill impairment charge in the future, which could be significant and have a material adverse effect on our business.

We review long-lived assets, including property, plant and equipment and identifiable amortizing intangible assets, for impairment whenever changes in circumstances or events may indicate that the carrying amounts are not recoverable. If the fair value is less than the carrying amount of the asset, an impairment is recognized for the difference. Factors which may cause an impairment of long-lived assets include significant changes in the manner of use of these assets, negative industry or market trends, a significant underperformance relative to historical or projected future operating results, extended period of idleness or a likely sale or disposal of the asset before the end of its estimated useful life. If our property, plant and equipment and identifiable amortizing intangible assets are determined to be impaired in the future, we may be required to record non-cash charges to earnings during the period in which the impairment is determined, which could be significant and have a material adverse effect on our business.

Legal, Environmental and Regulatory Risks

Effects of Regulation—Changes in or failure to comply with applicable laws or government regulations or policies could have a material adverse effect on our business.

Legislation or regulations that may be adopted or modified by U.S. or foreign governments that affect products we produce could significantly affect the sales, costs and profitability of our business, including legislation or regulations intended to address antitrust and competition, the environment, including greenhouse gas emissions, taxes, international trade matters through import and export duties and quotas and anti-dumping measures and related tariffs.

The chemical and ammunition industries are subject to extensive legislative and regulatory actions, which could have a material adverse effect on our business. Many of our products and operations are subject to chemical control laws of the countries in which they are located. These laws include regulation of chemical substances and inventories under the U.S. Toxic Substances Control Act of 1976 (TSCA) in the U.S. and the Registration, Evaluation and Authorization of Chemicals (REACH) regulation in Europe. Likewise, Congress and government agencies also periodically consider legislation and other regulations related to the ammunition business, and legislative or regulatory actions could affect our ability to manufacture and sell certain types of ammunition, including restrictions on exports to certain countries.

TSCA was amended in 2016, and the U.S. Environmental Protection Agency (EPA) is currently evaluating several of our products and manufacturing processes for additional regulation under the amended law. Certain of our products, or inputs into our manufacturing process, are subject to regulation under current TSCA regulations, and other chemicals or ingredients may be regulated under the law in the future. In 2024, the EPA finalized regulation that bans the use of asbestos, a principal material used in diaphragm-based chlorine manufacturing, in five years. Diaphragm technology-based chlorine production makes up a significant part of Olin’s capacity, and this government regulation could significantly increase the cost of production or cause us to close production capacity that would have negative consequences on our business. The EPA has also finalized regulation associated with several of Olin’s chlorinated organic products under the new TSCA law and these rules also present risk to these businesses. Olin is challenging many of these new regulations in an array of court proceedings, but the outcome of these litigation matters is uncertain. We also anticipate future regulatory action related to EDC and VCM under the amended TSCA law that could significantly affect the sales, costs and profitability of those product lines.

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Under REACH, additional testing requirements, documentation, risk assessments and registrations are occurring and will continue to occur and may adversely affect our costs of products produced in or imported into the European Union. The European Union is currently considering regulations related to the use of bisphenol, or BPA, in chemical manufacturing, which is a critical component of the epoxy resins we manufacture and sell in the region.

Compliance with current or future TSCA, REACH, or other regulations may limit or hinder our ability to manufacture our products and/or cause us to incur expenditures that are material to our business. Additionally, changes to government regulations and laws, including TSCA and REACH, or changes in their interpretation may reduce the demand for our products, impact our ability to use or manufacture certain products, or limit our ability to implement our strategies, any of which could have a material adverse effect on our business. A material change in tax laws, treaties or regulations in the jurisdictions in which we operate or a change in their interpretation or application could have a material adverse effect on our business.

Security and Chemicals Transportation—New regulations on the transportation of hazardous chemicals and/or the security of chemical manufacturing facilities and public policy changes related to transportation safety could result in significantly higher operating costs.

The transportation of our products and feedstocks, including transportation by pipeline, and the security of our chemical manufacturing facilities are subject to extensive regulations. Government authorities at the local, state and federal levels could implement new or stricter regulations, or change their interpretations of existing regulations, that would impact the security of chemical plant locations and the transportation of hazardous chemicals. Our Chlor Alkali Products and Vinyls and Epoxy segments could be adversely affected by the cost of complying with any new regulations. Our business also could be adversely affected if an incident were to occur at one of our facilities or while transporting products. The extent of the impact would depend on the requirements of future regulations and the nature of an incident, which are unknown at this time.

Legal and Regulatory Claims and Proceedings—We are subject to legal and regulatory claims and proceedings, which could cause us to incur significant expenses.

We are subject to legal and regulatory claims and proceedings relating to our present and former operations and could become subject to additional claims in the future, some of which could be material. These proceedings may be brought by the government or private parties and may arise out of a number of matters, including, antitrust claims, contract disputes, product liability claims, including ammunition and firearms, and proceedings alleging injurious exposure of plaintiffs to various chemicals and other substances (including proceedings based on alleged exposures to asbestos). Frequently, the proceedings alleging injurious exposure involve claims made by numerous plaintiffs against many defendants. Defense of these claims can be costly and time-consuming even if ultimately successful. Because of the inherent uncertainties of legal proceedings, we are unable to predict their outcome and therefore cannot determine whether the financial effect, if any, will be material to our business. We have included additional information with respect to pending legal and regulatory proceedings in Part II, Item 8—“Financial Statements and Supplementary Data,” under the heading “Legal Matters” within Note 22, “Commitments and Contingencies,” of our notes to consolidated financial statements.

Environmental Costs—We have ongoing environmental costs, which could have a material adverse effect on our business.

Our operations and assets are subject to extensive environmental, health and safety regulations, including laws and regulations related to air emissions, water discharges, waste disposal and remediation of contaminated sites. The nature of our operations and products, including the raw materials we handle, exposes us to the risk of liabilities, obligations or claims under these laws and regulations due to the production, storage, use, transportation and sale of materials that can adversely impact the environment or cause personal injury, including, in the case of chemicals, unintentional releases into the environment. Environmental laws may have a significant effect on the costs of use, transportation, handling and storage of raw materials and finished products, as well as the costs of storage, handling, treatment, transportation and disposal of wastes. In addition, we are party to various government and private environmental actions associated with past manufacturing facilities and former waste disposal sites. We have incurred, and expect 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. Liabilities 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 clean-up costs, natural resource 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 environmental laws, changes in the interpretation or implementation of current environmental laws or new information about the extent of remediation required, could require us to make additional

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expenditures, modify or curtail our operations and/or install additional pollution control equipment. It is possible that regulatory agencies may identify new chemicals of concern or enact new or more stringent clean-up standards for existing chemicals of concern. This could lead to expenditures for environmental remediation in the future that are additional to existing estimates.

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 have a material adverse effect on our business. See “Environmental Matters” contained in Item 7—“Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Governmental Contract Compliance and Deliverables—Various risks associated with our Lake City contract and performance under other government contracts could materially adversely affect our business.

Our Winchester business currently operates and manages the Lake City Army Ammunition Plant in Independence, MO under a multi-year contract with the U.S. Army. The contract has an initial term of seven years, that began on October 1, 2020, and has been extended for three additional years. Additionally, our Winchester business is engaged to perform various deliverables under other government contract arrangements. The Lake City facility also allows, under certain conditions, for Winchester to utilize the facility to produce commercial ammunition. The operation of the Lake City facility and our other U.S. government contracts require compliance with numerous contract provisions and government regulations. U.S. government contracts often reserve the right to audit our contract costs and conduct inquiries and investigations of our business practices and compliance with government contract requirements. In some cases, audits may result in delayed payments or contractor costs not being reimbursed or subject to repayment. Our failure to comply with any one of these contract provisions and regulations could have a material adverse effect on our business.

A large portion of our government contracts contain fixed-price deliverables while a smaller portion are performed under cost-plus arrangements. While certain of these contracts contain price escalation and other price adjustment provisions, if we are unable to control costs related to these contracts or if our assumptions regarding the fixed pricing on one or multiple of these contracts is incorrect, we may experience lower profitability, materially adversely affecting our business.

Item 7.  MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

BUSINESS BACKGROUND

Olin Corporation (Olin, the Company, we or our) is a Virginia corporation, incorporated in 1892, having its principal executive offices in Clayton, MO. We are a leading vertically integrated global manufacturer and distributor of chemical products and a leading U.S. manufacturer of ammunition. Our operations are concentrated in three business segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. All of our business segments are capital-intensive manufacturing businesses. The Chlor Alkali Products and Vinyls segment manufactures and sells chlorine and caustic soda, ethylene dichloride (EDC) and vinyl chloride monomer (VCM), methyl chloride, methylene chloride, chloroform, carbon tetrachloride, perchloroethylene, hydrochloric acid, hydrogen, bleach products and potassium hydroxide. The Epoxy segment produces and sells a full range of epoxy materials and precursors, including aromatics (acetone and phenol), allyl chloride, epichlorohydrin, liquid epoxy resins, solid epoxy resins and formulated solutions products such as converted epoxy resins and additives. The Winchester segment produces and sells sporting ammunition, reloading components, small caliber military ammunition and components, industrial cartridges and clay targets, along with contracted U.S. military project revenue.

RECENT DEVELOPMENTS AND HIGHLIGHTS

Overview

Net loss was $(100.5) million for 2025 compared to net income of $108.6 million for 2024, a decrease of $209.1 million. The decrease in results from the prior year was primarily due to lower operating results across all of our business segments. Diluted net loss per share was $(0.88) for 2025 compared to diluted net income per share of $0.91 for 2024, a decrease of $1.79 per share, or 197%.

Chlor Alkali Products and Vinyls repo rted segment income was $181.1 million for 2025 compared to segment income of $296.4 million for 2024. Chlor Alkali Products and Vinyls 2025 segment income included a $75.0 million pretax charge associated with a litigation loss contingency related to a VCM customer dispute and 2024 segment income included a $93.6 million penalty associated with Hurricane Beryl. The remaining decrease of $133.9 million in segment income from the prior year was primarily due to lower pricing, primarily EDC, and higher raw material and operating costs, including planned maintenance turnaround expenses, partially offset by higher volumes and the 45V Tax Credit (defined below in Other Items).

Epoxy reported segment loss was $(103.5) million for 2025 compared to segment loss of $(85.0) million for 2024. Epoxy’s 2024 segment loss included a $32.7 million penalty associated with Hurricane Beryl. The remaining decrease of $51.2 million in Epoxy segment results, as compared to the prior year, was primarily due to higher operating costs, including unabsorbed fixed manufacturing costs incurred from planned inventory reductions and planned maintenance turnarounds, partially offset by improved volumes. Global epoxy demand remains challenged, with continued market saturation from subsidized Asian competition.

Winchester reported segment income of $67.7 million for 2025 compared to segment income of $237.9 million for 2024. Winchester segment results were lower than in the prior year primarily due to decreased commercial ammunition sales volumes and pricing, along with higher raw material and operating costs, including commodity metal and propellant costs, partially offset by higher military project revenue.

Liquidity and Share Repurchases

During 2025, we repurchased and retired 2.2 million shares of common stock at a total value of $50.5 million. As of December 31, 2025, we had $1.9 billion of remaining authorization to repurchase shares of our common stock under our 2022 Repurchase Authorization and 2024 Repurchase Authorization (both defined in Liquidity and Capital Resources) programs.

On March 14, 2025, we issued $600.0 million aggregate principal amount of 6.625% senior notes due April 1, 2033 (2033 Notes), in a private offering exempt from the registration requirements of the Securities Act of 1933, as amended.

On March 14, 2025, we entered into a new $1,850.0 million senior credit facility (2025 Senior Credit Facility), which increased the borrowing limit of our then-existing credit facility by $300.0 million and extended the maturity date from October 11, 2027 to March 14, 2030. Pursuant to the agreement, the aggregate principal amount under our term loan facility increased from $350.0 million to $650.0 million and the aggregate principal amount under our revolving credit facility remained at $1,200.0 million. The term loan was fully drawn on the closing date.

During 2025, we had debt repayments, net of borrowings, of $11.2 million. Proceeds from the 2033 Notes, together with borrowings under the 2025 Senior Credit Facility, were used to redeem the $108.6 million 9.50% senior notes due 2025 (2025 Notes), redeem the $500.0 million 5.125% senior notes due 2027 (2027 Notes), refinance the then-existing $1,550.0 million senior credit facility (2022 Senior Credit Facility), comprised of $505.0 million of borrowings under the revolving credit

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facility with aggregate commitments of $1,200.0 million (2022 Revolving Credit Facility) and $332.5 million of borrowings under the term loan facility with aggregate commitments of $350.0 million (2022 Term Loan Facility), and pay related fees and expenses.

Subsequent Event - Credit Facility

On February 19, 2026, we executed an amendment to the 2025 Senior Credit Facility (Senior Secured Credit Facility) which, among other things, modified the financial covenants to be less restrictive and incorporated guarantees and collateral by certain of our domestic subsidiaries. The amendment required all remaining principal amortization payments under the Secured Term Loan Facility (as defined in Liquidity and Capital Resources) to be satisfied. Borrowings under the Senior Secured Revolving Credit Facility (as defined in Liquidity and Capital Resources) were used to satisfy the $109.7 million remaining principal amortization payments under the Secured Term Loan Facility. The maturity date for the Senior Secured Credit Facility remained March 14, 2030.

The amendment requires that the obligations under the Senior Secured Credit Facility be guaranteed by certain of our domestic subsidiaries. The obligations under the Senior Secured Credit Facility are also secured by liens on substantially all of Olin’s and the subsidiary guarantors’ personal property (Collateral), other than certain principal properties and capital stock of subsidiaries, and subject to certain other exceptions. The amendment provides that substantially all guarantees under the Senior Secured Credit Facility and liens on Collateral be released automatically upon notice by Olin, or after September 30, 2027, upon which time all covenant reliefs expire.

International Trade

Tariffs and trade flows continue to impact the demand outlook amid varying market responses. While we are continuing to monitor the situation, as of the date of this filing, the direct impact from current tariffs has not been significant to our chemicals businesses. Our chemicals businesses generally source and sell where we produce. An exception to this would be potential retaliatory tariffs on caustic soda and EDC exports, which could alter the economics rapidly within the respective countries. We continue to monitor and assess the impact of tariffs on goods being imported into the United States and the competitiveness of our export products in markets which implement retaliatory tariffs. Additionally, although Winchester procures the majority of metals domestically, we have realized price inflation that we believe is partially tariff driven for the domestic supply of copper, steel and tungsten products. Winchester has also realized secondary effects from suppliers consuming tariff impacted metals in their end products. Our global supply chain organization continuously monitors market trends and works to mitigate those and other cost increases through economies of scale in global procurement and efficient sourcing practices.

Other Items

On April 18, 2025, Olin acquired AMMO, Inc.’s small caliber ammunition manufacturing assets for total consideration of $55.8 million. The acquisition, which includes AMMO Inc.’s brass shellcase capabilities and its 185,000 square foot production facility located in Manitowoc, WI, is included in Olin’s Winchester segment. The acquisition was financed with cash on hand.

On September 18, 2025, we announced a mutual decision with Mitsui & Co., Ltd. to end our joint venture, Blue Water Alliance, by the end of 2025. This decision was made to evolve our EDC participation by emphasizing longer-term structural opportunities that enhance value and optionality. On November 11, 2025, Olin announced a commercial arrangement with Braskem, one of the largest petrochemical companies in the Americas and the leading producer of PVC in South America, for Olin to supply EDC to Braskem, aligning with Braskem's transformation of its chlor alkali and vinyl assets in Brazil.

In the third quarter of 2025, Olin determined that it qualified for the clean hydrogen production tax credit under Section 45V as part of the Inflation Reduction Act of 2022 (45V Tax Credit). We received notice of our provisional carbon dioxide emissions rate from the United States Department of Energy, which was a major milestone for recognition. The 45V Tax Credit is available for qualified clean hydrogen produced and sold during the 10-year period beginning on the date the qualified clean hydrogen production facility was originally placed in service. Since the 45V Tax Credit is refundable, we account for the 45V Tax Credit under a government grant model. As a result, during 2025 Olin recorded a $34.5 million reduction to cost of goods sold primarily related to the sale and use of hydrogen produced at certain of our chlor alkali plants. We expect an annual pretax benefit of $15 million to $20 million for years 2026 through 2028, with lower amounts through 2032. The impact of the 45V Tax Credit is included within the Chlor Alkali Products and Vinyls segment results.

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Subsequent Event - Litigation Matter

In April 2023, Shintech filed a lawsuit against Olin Corporation and its wholly owned subsidiary, Blue Cube Operations LLC. Shintech alleged that Olin breached a long‑term VCM supply agreement relating to deliveries to Shintech’s PVC facility in Freeport, TX, following a pricing dispute, a 2023 maintenance turnaround at Olin’s Freeport, TX VCM facility, and Olin’s declaration of force majeure at Olin’s Freeport, TX VCM facility. After nearly three years of litigation, on February 10, 2026, the jury returned a verdict in favor of Shintech on its breach‑of‑contract claims. As a result of this verdict, the Company obtained new information related to this litigation loss contingency and recorded a pretax charge of $75.0 million in the fourth quarter 2025. During the first half of 2026, we expect to pay approximately $185 million to Shintech associated with the litigation matter, and previously recorded accruals for a VCM pricing dispute with Shintech.

CONSOLIDATED RESULTS OF OPERATIONS

Years Ended December 31,

($ in millions, except per share data)

Sales

Cost of goods sold

Gross margin

Selling and administrative

Restructuring charges

Other operating income

Operating income

Losses of non-consolidated affiliates

Interest expense

Interest income

Non-operating pension income

Income (loss) before taxes

Income tax (benefit) provision

Net (loss) income

Net loss attributable to noncontrolling interests

Net (loss) income attributable to Olin Corporation

Net (loss) income attributable to Olin Corporation per common share:

Basic

Diluted

2025 Compared to 2024

Sales for 2025 were $6,780.8 million compared to $6,540.1 million in 2024, an increase of $240.7 million, or 4%. Epoxy sales increased by $145.5 million, primarily due to higher volumes, including the impact of Hurricane Beryl in 2024, partially offset by lower pricing. Chlor Alkali Products and Vinyls sales increased by $54.2 million, primarily due to higher volumes, partially offset by lower pricing. Winchester sales increased by $41.0 million, primarily due to increased sales to military customers and military project revenue, partially offset by lower commercial ammunition sales.

Gross margin in 2025 decreased $236.0 million from 2024. Winchester gross margin decreased by $173.5 million, primarily due to lower commercial sales volumes and pricing, and higher raw material and operating costs, including commodity metal and propellant costs. Chlor Alkali Products and Vinyls gross margin decreased by $56.3 million primarily due to lower pricing, primarily EDC, higher raw material and operating costs, including planned maintenance turnaround expenses, partially offset by higher volumes, the impact of Hurricane Beryl in 2024 and a benefit primarily related to the 45V Tax Credit. Epoxy gross margin decreased by $13.8 million primarily due to higher operating costs, including unabsorbed fixed manufacturing costs incurred from planned inventory reductions and planned maintenance turnaround expenses, partially offset by the impact of Hurricane Beryl in 2024. Gross margin as a percentage of sales decreased to 7% in 2025 from 11% in 2024.

Selling and administrative expenses in 2025 increased $54.8 million, or 13%, from 2024. The increase was primarily due to a $75.0 million charge associated with a litigation loss contingency related to a VCM customer dispute and higher stock-based compensation expense of $10.4 million, which includes mark-to-market adjustments, partially offset by a favorable

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foreign currency impact of $16.6 million and lower consulting and contract services of $13.0 million. Selling and administrative expenses as a percentage of sales increased to 7% in 2025 from 6% in 2024.

Restructuring charges for 2025 were $33.4 million compared to $33.3 million in 2024. Restructuring charges include facility exit costs, lease and other contract termination costs, and employee severance and related benefits costs.

Losses of non-consolidated affiliates relate to Olin’s equity share of the Hidrogenii, LLC joint venture.

Interest expense in 2025 increased $3.8 million from 2024, primarily due to the write-off of unamortized deferred debt issuance costs and costs associated with our first quarter financing transactions including the 2025 Senior Credit Facility, early redemption of the 2025 Notes and the 2027 Notes, and issuance of the 2033 Notes.

Non-operating pension income includes all components of pension and other postretirement net periodic benefit (income) cost, other than service costs. Non-operating pension income was lower for the year ended December 31, 2025 compared to the prior year, primarily due to a lower assumption for the long-term rate of return on plan assets.

The tax benefit for 2025 was $60.0 million, resulting in a tax rate of 37.2%. The effective tax rate was higher than the 21.0% U.S. federal statutory rate, primarily due to state income tax, non-taxable exchange rate results, U.S. federal tax credits and favorable permanent salt depletion deductions, partially offset by foreign income inclusions, changes in tax contingencies and remeasurement of deferred taxes due to a decrease in tax rates in a foreign jurisdiction. Tax expense for 2024 was $36.7 million, resulting in a tax rate of 25.9%. The effective tax rate was higher than the 21.0% U.S. federal statutory rate, primarily due to state income tax, foreign income inclusions, non-deductible exchange rate results, expenses from prior year tax positions and from a net increase in the valuation allowance related to deferred tax assets in foreign jurisdictions, partially offset by favorable permanent salt depletion deductions, benefits associated with stock-based compensation, U.S. federal tax credits purchased at a discount, changes in tax contingencies and remeasurement of deferred taxes due to a decrease in our state effective tax rates.

2024 Compared to 2023

Sales for 2024 were $6,540.1 million compared to $6,833.0 million in 2023, a decrease of $292.9 million, or 4%. Chlor Alkali Products and Vinyls sales decreased by $364.9 million, primarily due to lower pricing, primarily caustic soda. Epoxy sales decreased by $102.9 million, primarily due to lower product pricing, partially offset by increased sales volumes. Winchester sales increased by $174.9 million, primarily due to increased sales to international military customers and military project revenue and 2024 sales from White Flyer.

Gross margin in 2024 decreased $428.0 million from 2023. Chlor Alkali Products and Vinyls gross margin decreased by $344.1 million primarily due to lower pricing, primarily caustic soda. Epoxy gross margin decreased by $55.1 million primarily due to lower product pricing, partially offset by increased volumes. Winchester gross margin decreased by $21.3 million, primarily due to higher commodity and operating costs, including propellant costs, and lower product pricing, partially offset by White Flyer results. Gross margin as a percentage of sales decreased to 11% in 2024 from 17% in 2023.

Selling and administrative expenses in 2024 increased $1.8 million from the prior year. The increase was primarily due to higher legal and legal-related settlement expense of $23.2 million and consulting and contract services of $3.1 million, partially offset by lower stock-based compensation expense of $18.0 million, which includes mark-to-market adjustments, and a favorable foreign currency impact of $7.4 million. Selling and administrative expenses as a percentage of sales was 6% for both 2024 and 2023.

Restructuring charges for 2024 were $33.3 million compared to $89.6 million in 2023. The decrease was primarily due to charges associated with our 2023 actions to reconfigure our global Epoxy asset footprint to optimize the most productive and cost-effective assets to support our operating model, which resulted in pretax restructuring charges for 2024 and 2023 of $24.1 million and $73.4 million, respectively.

Other operating income for 2023 included a gain of $27.0 million from the sale of our domestic private trucking fleet and operations and an insurance recovery of $15.6 million associated with a second quarter 2022 business interruption at our Plaquemine, LA Chlor Alkali Products and Vinyls facility.

Interest expense in 2024 increased $3.4 million from 2023, primarily due to higher average interest rates. Interest expense for 2024 and 2023 was reduced by capitalized interest of $1.7 million and $2.8 million, respectively.

Non-operating pension income includes all components of pension and other postretirement income (costs) other than service costs.

Tax expense for 2024 was $36.7 million, resulting in a tax rate of 25.9%. The effective tax rate was higher than the 21.0% U.S. federal statutory rate, primarily due to state income tax, foreign income inclusions, non-deductible exchange rate results, expenses from prior year tax positions and from a net increase in the valuation allowance related to deferred tax assets

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in foreign jurisdictions, partially offset by favorable permanent salt depletion deductions, benefits associated with stock-based compensation, U.S. federal tax credits purchased at a discount, changes in tax contingencies and remeasurement of deferred taxes due to a decrease in our state effective tax rates. Tax expense for 2023 was $107.3 million, resulting in a tax rate of 19.2%. The effective tax rate was lower than the 21.0% U.S. federal statutory rate primarily due to a favorable foreign rate differential, favorable permanent salt depletion deductions, benefits associated with a legal entity liquidation, prior year tax positions, stock-based compensation, remeasurement of deferred taxes due to a decrease in our state effective tax rates and foreign rate changes, and from a change in tax contingencies, partially offset by state income tax, an increase in the valuation allowance related to losses in foreign jurisdictions and foreign income inclusions.

SEGMENT RESULTS

We define segment results as income (loss) before interest expense, interest income, other operating income (expense), non-operating pension income, other income and income taxes, and includes the results of non-consolidated affiliates in segment results consistent with management’s monitoring of the operating segments. We have three operating segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. The three operating segments reflect the organization used by our management for purposes of allocating resources and assessing performance, and represents our reportable segments. Chlorine and caustic soda used in our Epoxy segment is transferred at cost from the Chlor Alkali Products and Vinyls segment.

Years Ended December 31,

Sales:

($ in millions)

Chlor Alkali Products and Vinyls

Epoxy

Winchester

Total sales

Income before taxes:

Chlor Alkali Products and Vinyls

Epoxy

Winchester

Corporate/Other:

Environmental expense (1)

Other corporate and unallocated costs

Restructuring charges

Other operating income (2)

Interest expense

Interest income

Non-operating pension income

Income before taxes

(1) Environmental expense for the years ended December 31, 2025 and 2023, included $1.0 million and $6.4 million, respectively, of insurance recoveries for environmental costs incurred and expensed in prior periods. Environmental expense is included in cost of goods sold in the consolidated statements of operations.

(2) Other operating income for the year ended December 31, 2023, included a gain of $27.0 million from the sale of our domestic private trucking fleet and operations and an insurance recovery of $15.6 million associated with a second quarter 2022 business interruption at our Plaquemine, LA, Chlor Alkali Products and Vinyls facility.

Chlor Alkali Products and Vinyls

2025 Compared to 2024

Chlor Alkali Products and Vinyls sales for 2025 were $3,684.4 million compared to $3,630.2 million in 2024, an increase of $54.2 million, or 1%. The sales increase was primarily due to higher volumes, partially offset by lower pricing, primarily EDC.

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Chlor Alkali Products and Vinyls reported segment income of $181.1 million for 2025 compared to segment income of $296.4 million for 2024, a decrease of $115.3 million. The decrease in Chlor Alkali Products and Vinyls operating results were primarily due to lower pricing ($227.5 million), primarily EDC, higher raw material and operating costs ($151.0 million), including planned maintenance turnaround expenses, and a charge associated with a litigation loss contingency related to a VCM customer dispute ( $75.0 million ). These decreases were partially offset by higher volumes ($134.3 million), the negative impact of Hurricane Beryl in 2024 resulting in incremental costs to restore operations, unabsorbed fixed manufacturing costs, and reduced profit from lost sales ($93.6 million), lower costs associated with products purchased from other parties ($75.7 million) and a benefit primarily related to the 45V Tax Credit ($34.5 million). Chlor Alkali Products and Vinyls segment results included depreciation and amortization expense of $423.6 million and $424.6 million in 2025 and 2024, respectively.

2024 Compared to 2023

Chlor Alkali Products and Vinyls sales for 2024 were $3,630.2 million compared to $3,995.1 million in 2023, a decrease of $364.9 million, or 9%. The sales decrease was primarily due to lower pricing, primarily caustic soda, partially offset by increased sales volumes associated with products purchased from other parties.

Chlor Alkali Products and Vinyls reported segment income of $296.4 million for 2024 compared to $664.2 million for 2023, a decrease of $367.8 million. The decrease in Chlor Alkali Products and Vinyls operating results were primarily due to lower pricing ($462.8 million), primarily caustic soda, the negative impact of Hurricane Beryl resulting in incremental costs to restore operations, unabsorbed fixed manufacturing costs, and reduced profit from lost sales ($93.6 million), and an unfavorable product mix ($42.7 million), partially offset by lower costs associated with products purchased from other parties ($123.4 million) and lower raw material and operating costs ($107.9 million). The Chlor Alkali Products and Vinyls 2023 segment results were negatively impacted by higher costs and reduced profit from lost sales associated with operating issues related to the second quarter’s maintenance turnaround at our vinyl chloride monomer plant at the Freeport, TX facility. Chlor Alkali Products and Vinyls segment results included depreciation and amortization expense of $424.6 million and $440.7 million in 2024 and 2023, respectively.

Epoxy

2025 Compared to 2024

Epoxy sales were $1,371.8 million for 2025 compared to $1,226.3 million in 2024, an increase of $145.5 million, or 12%. The sales increase was due to higher volumes ($206.2 million), including the impact of lost sales associated with Hurricane Beryl in 2024, and a favorable effect of foreign currency translation ($11.1 million), partially offset by lower product pricing ($71.8 million).

Epoxy reported segment loss of $(103.5) million for 2025 compared to segment loss of $(85.0) million for 2024, a decrease in segment results of $18.5 million. The decrease in Epoxy segment results was due to higher operating costs ($104.7 million), including unabsorbed fixed manufacturing costs incurred from planned inventory reductions and planned maintenance turnaround expenses, and lower product pricing ($71.8 million), partially offset by lower raw material costs ($76.4 million), primarily benzene and propylene, the negative impact of Hurricane Beryl in 2024 resulting in incremental costs to restore operations, unabsorbed fixed manufacturing costs, and reduced profit from lost sales ($32.7 million) and increased volumes ($48.9 million). A significant percentage of our Euro denominated sales are of products manufactured within Europe. As a result, the impact of foreign currency translation on revenue is primarily offset by the impact of foreign currency translation on raw materials and manufacturing costs also denominated in Euros. Epoxy segment results included depreciation and amortization expense of $51.7 million and $53.7 million in 2025 and 2024, respectively.

2024 Compared to 2023

Epoxy sales were $1,226.3 million for 2024 compared to $1,329.2 million in 2023, a decrease of $102.9 million, or 8%. The sales decrease was due to lower product prices ($148.3 million) and an unfavorable effect of foreign currency translation ($4.5 million), partially offset by increased sales volumes ($49.9 million), which were negatively impacted by Hurricane Beryl.

Epoxy reported segment loss of $(85.0) million for 2024 compared to $(31.0) million for 2023, a decrease in segment results of $54.0 million. The decrease was due to lower product prices ($148.3 million), which continues to be impacted by significant exports out of Asia into the European and North American markets, and the negative impact of Hurricane Beryl resulting in incremental costs to restore operations, unabsorbed fixed manufacturing costs, and reduced profit from lost sales ($32.7 million), partially offset by increased volumes and improved product mix ($76.4 million) and lower raw material and operating costs ($50.6 million). A significant percentage of our Euro denominated sales are of products manufactured within Europe. As a result, the impact of foreign currency translation on revenue is primarily offset by the impact of foreign currency translation on raw materials and manufacturing costs also denominated in Euros. Epoxy segment results included depreciation and amortization expense of $53.7 million and $57.4 million in 2024 and 2023, respectively.

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Winchester

2025 Compared to 2024

Winchester sales were $1,724.6 million for 2025 compared to $1,683.6 million in 2024, an increase of $41.0 million, or 2%. The sales increase was due to higher sales to military customers and military project revenue ($250.4 million), partially offset by lower sales to commercial customers ($200.2 million) and law enforcement agencies ($9.2 million).

Winchester reported segment income of $67.7 million for 2025 compared to $237.9 million for 2024, a decrease of $170.2 million. The decrease in segment results was due to an unfavorable sales mix ($70.0 million), higher raw material and operating costs ($58.1 million), including commodity metal and propellant costs, and lower product pricing ($42.1 million). Winchester segment results included depreciation and amortization expense of $34.2 million and $33.8 million in 2025 and 2024, respectively.

2024 Compared to 2023

Winchester sales were $1,683.6 million for 2024 compared to $1,508.7 million in 2023, an increase of $174.9 million, or 12%. The increase was due to higher sales to domestic and international military customers ($148.9 million) and higher sales to commercial customers ($30.1 million), partially offset by lower sales to law enforcement agencies ($4.1 million). Commercial sales were higher due to 2024 sales from White Flyer, partially offset by lower commercial ammunition sales.

Winchester reported segment income of $237.9 million for 2024 compared to $255.6 million for 2023, a decrease of $17.7 million. The decrease in segment results was due to higher commodity and operating costs ($19.2 million), including propellant costs, and lower product pricing ($10.9 million), partially offset by higher sales volumes ($12.4 million), which includes White Flyer. Winchester segment results included depreciation and amortization expense of $33.8 million and $27.2 million in 2024 and 2023, respectively.

Corporate/Other

2025 Compared to 2024

For the year ended December 31, 2025, charges to income for environmental investigatory and remedial activities were $24.5 million, compared to $30.2 million for the year ended December 31, 2024. These charges relate primarily to expected future investigatory and remedial activities associated with past manufacturing operations and former waste disposal sites. For the year ended December 31, 2025, environmental expense included $1.0 million of insurance recoveries for environmental costs incurred and expensed in prior periods.

For 2025, other corporate and unallocated costs were $85.7 million compared to $90.1 million for 2024, a decrease of $4.4 million, or 5%. The decrease was primarily due to a favorable foreign currency impact ($16.6 million) and lower legal and legal-related settlement expenses ($4.5 million), partially offset by higher stock-based compensation costs ($10.4 million), which includes mark-to-market adjustments, and higher depreciation and amortization expense ($6.1 million).

2024 Compared to 2023

For the year ended December 31, 2024, charges to income for environmental investigatory and remedial activities were $30.2 million, compared to $23.7 million for the year ended December 31, 2023. These charges relate primarily to expected future investigatory and remedial activities associated with past manufacturing operations and former waste disposal sites. For the year ended December 31, 2023, environmental expense included $6.4 million of insurance recoveries for environmental costs incurred and expensed in prior periods.

For 2024, other corporate and unallocated costs were $90.1 million compared to $106.3 million for 2023, a decrease of $16.2 million, or 15%. The decrease was primarily due to lower stock-based compensation costs ($18.0 million), which includes mark-to-market adjustments and a favorable foreign currency impact ($7.4 million), partially offset by higher consulting costs ($4.9 million) and increased legal and legal-related settlement expenses ($2.9 million).

Restructurings

Pretax restructuring charges related to our restructuring and optimization efforts include facility exit costs, lease and other contract termination costs, employee severance and related benefits costs and non-cash write-off of equipment and facilities. Pretax restructuring charges for the years ended 2025, 2024 and 2023 were as follows:

Years Ended December 31,

Restructuring Charges

($ in millions)

Restructuring charges

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We have included additional information with respect to our restructuring charges within Item 8—“Financial Statements and Supplementary Data,” within Note 5, “Restructuring Charges” of our notes to consolidated financial statements.

2026 OUTLOOK

During the fourth quarter 2025, Chlor Alkali Products and Vinyls segment results included a $75 million pretax charge associated with a litigation loss contingency related to a VCM customer dispute. Due to this non-recurring charge, we expect first quarter 2026 operating results from our Chemicals businesses to be higher than the fourth quarter 2025 but to be negatively impacted by higher planned maintenance turnaround costs and higher raw material costs, including increased power costs. We expect our Winchester business first quarter 2026 results to modestly increase from fourth quarter 2025 due to more normalized inventories at our retail customers. Overall, we expect Olin’s first quarter 2026 operating results to be higher than the fourth quarter 2025 levels.

Other corporate and unallocated costs in 2026 are expected to be higher than the $85.7 million in 2025.

During 2026, we anticipate environmental expenses in the $25 million to $35 million range, compared to $24.5 million in 2025.

We expect non-operating pension income in 2026 to be lower than the $20.6 million in 2025. Based on our plan assumptions and estimates, we will not be required to make any cash contributions to our domestic qualified defined benefit pension plan in 2026. We have several international qualified defined benefit pension plans for which we anticipate cash contributions of less than $5 million in 2026.

During the first half of 2026, we expect to pay approximately $185 million to Shintech associated with the litigation matter discussed in Note 22, “Commitments and Contingencies” of our notes to consolidated financial statements, and previously recorded accruals for a VCM pricing dispute with Shintech.

In 2026, we currently expect our capital spending to be approximately $200 million. We expect 2026 depreciation and amortization expense to be approximately $475 million.

We currently believe the 2026 effective tax rate will be in the 20% to 30% range. We expect to receive refunds from prior years related to the clean hydrogen production tax credit under Section 45V as part of the Inflation Reduction Act of 2022. Factoring in these refunds, we expect cash taxes to be in the range of a net refund of $20 million to a net payment of $20 million.

PENSION AND POSTRETIREMENT BENEFITS

We recorded an after-tax benefit of $39.9 million ($52.1 million pretax) to shareholders’ equity as of December 31, 2025, for our pension and other postretirement plans. This benefit primarily reflects a favorable performance on plan assets and a 60-basis point increase in the international defined benefit pension plans’ discount rate, partially offset by a 30-basis point decrease in the domestic pension plans’ discount rate during 2025.

In 2024, we recorded an after-tax benefit of $21.7 million ($29.7 million pretax) to shareholders’ equity as of December 31, 2024, for our pension and other postretirement plans. This benefit primarily reflected a 50-basis point increase in the domestic pension plans’ discount rate and a 20-basis point increase in the international defined benefit pension plans’ discount rate, partially offset by an unfavorable performance on plan assets during 2024.

In 2023, we recorded an after-tax charge of $13.2 million ($18.1 million pretax) to shareholders’ equity as of December 31, 2023, for our pension and other postretirement plans. This charge primarily reflected a 30-basis point decrease in the domestic pension plans’ discount rate and a 50-basis point decrease in the international defined benefit pension plans’ discount rate, partially offset by a favorable performance on plan assets during 2023.

Based on our plan assumptions and estimates, we will not be required to make any cash contributions to the domestic qualified defined benefit pension plan at least through 2026.

In connection with our international qualified defined benefit pension plans, we made cash contributions of $0.7 million, $1.3 million and $1.0 million in 2025, 2024 and 2023, respectively, and we anticipate less than $5 million of cash contributions to international qualified defined benefit pension plans in 2026.

At December 31, 2025, the projected benefit obligation of $2,024.8 million exceeded the market value of assets in our qualified defined benefit pension plans by $97.9 million, as calculated under Accounting Standards Codification (ASC) 715 “Compensation—Retirement Benefits.”

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Components of net periodic benefit (income) costs were:

Years Ended December 31,

Net Periodic Benefit (Income) Costs

($ in millions)

Pension benefits

Other postretirement benefit costs

The service cost component of net periodic benefit (income) costs related to employees of the operating segments are allocated to the operating segments based on their respective estimated census data.

We have included additional information with respect our defined benefit pension plans and other postretirement benefit plans within Item 8—“Financial Statements and Supplementary Data,” Note 12, “Pension Plans,” and Note 13, “Postretirement Benefits,” of our notes to consolidated financial statements.

ENVIRONMENTAL MATTERS

Years Ended December 31,

Cash Outlays

($ in millions)

Remedial and investigatory spending (charged to reserve)

Capital spending

Plant operations (charged to cost of goods sold)

Total cash outlays

Cash outlays for remedial and investigatory activities associated with former waste sites and past operations were not charged to income but instead were charged to reserves established for such costs identified and expensed to income in prior years. Cash outlays for normal plant operations for the disposal of waste and the operation and maintenance of pollution control equipment and facilities to ensure compliance with mandated and voluntarily imposed environmental quality standards were charged to income.

Total environmental-related cash outlays for 2026 are estimated to be approximately $210 million, of which approximately $25 million to $35 million is expected to be spent on investigatory and remedial efforts, approximately $6 million on capital projects and approximately $175 million on normal plant operations. Historically, we have funded our environmental capital expenditures through cash flow from operations and expect to do so in the future.

Annual environmental-related cash outlays for site investigation and remediation, capital projects and normal plant operations are expected to range between $200 million to $220 million over the next several years, $25 million to $35 million of which is for investigatory and remedial efforts, which are expected to be charged against reserves recorded on our consolidated balance sheet. While we do not anticipate a material increase in the projected annual level of our environmental-related cash outlays for site investigation and remediation, there is always the possibility that such an increase may occur in the future in view of the uncertainties associated with environmental exposures.

Our liabilities for future environmental expenditures were as follows:

December 31,

Environmental Liabilities

($ in millions)

Beginning balance

Charges to income

Remedial and investigatory spending

Ending balance

As is common in our industry, we are subject to environmental laws and regulations related to the use, storage, handling, generation, transportation, emission, discharge, disposal and remediation of, and exposure to, hazardous and non-hazardous substances and wastes in all of the countries in which we do business.

The establishment and implementation of national, state or provincial and local standards to regulate air, water and land quality affect substantially all of our manufacturing locations around the world. Laws providing for regulation of the manufacture, transportation, use and disposal of hazardous and toxic substances, and remediation of contaminated sites, have

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imposed additional regulatory requirements on industry, particularly the chemicals industry. In addition, implementation of environmental laws has required and will continue to require new capital expenditures and will increase plant operating costs. We employ waste minimization and pollution prevention programs at our manufacturing sites.

We are party to various government and private environmental actions associated with past manufacturing facilities and former waste disposal sites. Associated costs of investigatory and remedial activities are provided for in accordance with generally accepted accounting principles governing probability and the ability to reasonably estimate future costs. Our ability to estimate future costs depends on whether our investigatory and remedial activities are in preliminary or advanced stages. With respect to unasserted claims, we accrue liabilities for costs that, in our experience, we expect to incur to protect our interests against those unasserted claims. Our accrued liabilities for unasserted claims amounted to $11.4 million at December 31, 2025. With respect to asserted claims, we accrue liabilities based on remedial investigation, feasibility study, remedial action and operation, maintenance and monitoring (OM&M) expenses that, in our experience, we expect to incur in connection with the asserted claims. Required site OM&M expenses are estimated and accrued in their entirety for required periods not exceeding 30 years, which reasonably approximates the typical duration of long-term site OM&M.

Environmental provisions charged to income, which are included in cost of goods sold, were as follows:

Years Ended December 31,

Environmental Expense

($ in millions)

Provisions charged to income

Insurance recoveries (1)

Environmental expense

(1)     Insurance recoveries for costs incurred and expensed in prior periods.

These charges relate primarily to remedial and investigatory activities associated with past manufacturing operations and former waste disposal sites and may be material to operating results in future years.

We have included additional information with respect to environmental matters within Item 8—“Financial Statements and Supplementary Data,” Note 20, “Environmental,” of our notes to consolidated financial statements.

LEGAL MATTERS AND CONTINGENCIES

Discussion of legal matters and contingencies can be referred to under Item 8—“Financial Statements and Supplementary Data,” within Note 22, “Commitments and Contingencies” of our notes to consolidated financial statements.

LIQUIDITY AND CAPITAL RESOURCES

Cash Flow Data

Years Ended December 31,

Cash Provided by (Used for)

($ in millions)

Net operating activities

Capital expenditures

Business acquired in purchase transaction, net of cash acquired

Payments under other long-term supply contracts

Proceeds from disposition of property, plant and equipment

Investments in non-consolidated affiliates

Net investing activities

Long-term debt (repayments) borrowings, net

Common stock repurchased and retired

Stock options exercised

Dividends paid

Contributions received from noncontrolling interests

Net financing activities

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Operating Activities

For 2025, cash provided by operating activities decreased by $29.0 million from 2024, primarily due to decreased operating results, partially offset by a benefit in working capital compared with a use of working capital in the prior year. For 2025, working capital decreased $143.1 million, compared to an increase of $19.9 million in 2024. Receivables decreased by $123.7 million, primarily as a result of an improved days sales outstanding for 2025. Inventories decreased by $80.0 million primarily as a result of inventory reduction initiatives in our Epoxy business. Income taxes payable, net of income taxes receivable, decreased by $179.8 million from December 31, 2024, primarily due to timing of international tax payments and Inflation Reduction Act tax credits recognized in 2025. Accounts payable and accrued liabilities increased $128.0 million from December 31, 2024, which includes an increase in accruals associated with a litigation matter discussed within Note 22, “Commitments and Contingencies,” of the notes to consolidated financial statements. During the first half of 2026, we expect to pay approximately $185 million to Shintech associated with the litigation matter, and previously recorded accruals for a VCM pricing dispute with Shintech.

For 2024, cash provided by operating activities decreased by $471.1 million from 2023, primarily due to a decrease in operating results and increased working capital compared to the prior year. For 2024, working capital increased $19.9 million, compared to a decrease of $68.6 million in 2023. Receivables increased by $119.4 million, primarily as a result of the termination of our accounts receivable factoring program. Accounts payable and accrued liabilities increased $72.8 million.

Investing Activities

Capital spending was $226.3 million and $195.1 million in 2025 and 2024, respectively. In 2026, we expect our capital spending to be in the $200 million range. Our capital spending forecast represents normal capital spending to maintain our current operating facilities.

For the year ended December 31, 2025, payments of $31.0 million were made under other long-term supply contracts related to our Stade, Germany facility. Our payments for this project were completed in 2025. For the year ended December 31, 2024, payments of $58.6 million were made under other long-term supply contracts for energy modernization projects on the U.S. Gulf Coast. Our payments for this project were completed in 2024.

On April 18, 2025, Olin acquired AMMO, Inc.’s small caliber ammunition manufacturing assets for total consideration of $55.8 million. The acquisition was financed with cash on hand.

For the years ended December 31, 2025 and 2024, we contributed capital of $1.8 million and $23.0 million, respectively, in a non-consolidated affiliate, Hidrogenii, a joint venture between Plug Power, Inc. and Olin Corporation.

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Financing Activities

During 2025 and 2024, activity with respect to our outstanding debt included:

December 31,

Long-term Debt Borrowings (Repayments)

($ in millions)

Borrowings

Term Loan Facilities

Revolving Credit Facilities

Receivables Financing Agreements

2033 Notes

Total borrowings

Repayments

Go zone bonds, due 2024

Recovery zone bonds, due 2024

Term Loan Facilities

Revolving Credit Facilities

Receivables Financing Agreements

Industrial development and environmental improvement obligations

2025 Notes

2027 Notes

Total repayments

Long-term debt (repayments) borrowings, net

In 2025 we paid debt issuance costs of $12.0 million associated with the 2033 Notes and the 2025 Senior Credit Facility. In 2024, we paid debt issuance costs of $1.2 million associated with the 2024 Receivables Financing Agreement.

For the years ended December 31, 2025 and 2024, 2.2 million and 5.9 million shares, respectively, of common stock were repurchased and retired at a total value of $50.5 million and $300.3 million, respectively.

For the years ended December 31, 2025 and 2024, we issued 0.1 million and 0.9 million shares, respectively, with a total value of $2.3 million and $23.9 million, respectively, representing stock options exercised. For the year ended December 31, 2024, we withheld and paid $10.5 million for employee taxes on share-based payment arrangements.

The percentage of total debt to total capitalization increased to 60.2% as of December 31, 2025, from 58.0% as of December 31, 2024, primarily as a result of lower shareholders’ equity, primarily due to our operating results, dividends paid, and common stock repurchases.

Dividends per common share were $0.80 in 2025 and 2024. Total dividends paid on common stock amounted to $91.6 million and $94.2 million in 2025 and 2024, respectively. On February 19, 2026, our Board of Directors declared a dividend of $0.20 per share on our common stock, payable on March 13, 2026, to shareholders of record on March 3, 2026.

The payment of future cash dividends is subject to the discretion of our Board of Directors and will be determined in light of then-current conditions, including our earnings, our operations, our financial condition, our capital requirements and other factors deemed relevant by our Board of Directors. In the future, our Board of Directors may change our dividend policy, including the frequency or amount of any dividend, in light of then-existing conditions.

Liquidity and Other Financing Arrangements

Our principal sources of liquidity are from cash and cash equivalents, cash flow from operations and borrowings under our Senior Secured Revolving Credit Facility and our 2024 Receivables Financing Agreement (as defined below). Additionally, we believe that we have access to the high-yield debt and equity markets.

On March 14, 2025, Olin issued $600.0 million aggregate principal amount of 2033 Notes, in a private offering exempt from the registration requirements of the Securities Act of 1933, as amended. Interest on the 2033 Notes is paid semi-annually and began on October 1, 2025.

On March 14, 2025, Olin entered into the 2025 Senior Credit Facility, which increased the borrowing limit of our then-existing 2022 Senior Credit Facility by $300.0 million and extended the maturity date from October 11, 2027 to March 14,

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2030. The 2025 Senior Credit Facility includes a term loan facility with aggregate commitments of $650.0 million (2025 Term Loan Facility) and a revolving credit facility with aggregate commitments of $1,200.0 million (2025 Revolving Credit Facility).

The 2025 Term Loan Facility replaced Olin’s then-existing 2022 Term Loan Facility (collectively, with the 2025 Term Loan Facility, the Term Loan Facilities). The 2025 Term Loan Facility requires principal amortization payments that began on June 30, 2025 at a rate of 0.625% per quarter through March 31, 2027, increasing to 1.250% per quarter thereafter, until maturity, and was fully drawn on the closing date.

The 2025 Revolving Credit Facility replaced Olin’s then-existing 2022 Revolving Credit Facility (collectively, with the 2025 Revolving Credit Facility, the Revolving Credit Facilities). The 2025 Revolving Credit Facility includes a $100.0 million letter of credit subfacility.

Proceeds from the 2033 Notes, together with borrowings under the 2025 Senior Credit Facility, were used to redeem the $108.6 million 2025 Notes, redeem the $500.0 million 2027 Notes, refinance the then-existing 2022 Senior Credit Facility, comprised of $505.0 million of borrowings under the 2022 Revolving Credit Facility and $332.5 million of borrowings under the 2022 Term Loan Facility, and pay related fees and expenses.

We were in compliance with all covenants and restrictions under all our outstanding debt agreements as of December 31, 2025 , and no event of default had occurred under any of our outstanding debt agreements that would permit the acceleration of the debt if not cured. In the future, our ability to generate sufficient operating cash flows, among other factors, will determine the amounts available to be borrowed under these facilities. As of December 31, 2025, as a result of our restrictive covenant related to the leverage ratio, the maximum additional borrowings available to us was $825.3 million. This limitation restricts our ability to borrow the maximum amounts available under the 2025 Revolving Credit Facility and the 2024 Receivables Financing Agreement. As of December 31, 2025, there were no other covenants or restrictions that would have limited our ability to borrow.

On February 19, 2026, we executed the Senior Secured Credit Facility which, among other things, modified the financial covenants to be less restrictive and incorporated guarantees and collateral by certain of our domestic subsidiaries. The Senior Secured Credit Facility maintained the 2025 Term Loan Facility, as amended (Secured Term Loan Facility) and the 2025 Revolving Credit Facility, as amended (Senior Secured Revolving Credit Facility). The amendment required all remaining principal amortization payments under the Secured Term Loan Facility to be satisfied. Borrowings under the Senior Secured Revolving Credit Facility were used to satisfy the $109.7 million remaining principal amortization payments under the Secured Term Loan Facility. The maturity date for the Senior Secured Credit Facility remained March 14, 2030.

The amendment requires that the obligations under the Senior Secured Credit Facility be guaranteed by certain of our domestic subsidiaries and are also secured by liens on Collateral, other than certain principal properties and capital stock of subsidiaries, and subject to certain other exceptions. The amendment provides that substantially all guarantees under the Senior Secured Credit Facility and liens on Collateral be released automatically upon notice by Olin, or after September 30, 2027, upon which time all covenant reliefs expire.

Under the Senior Secured Credit Facility, we may select various floating rate borrowing options. The actual interest rate paid on borrowings under the Senior Secured Credit Facility is based on a pricing grid which is dependent upon the net leverage ratio as calculated under the terms of the applicable facility for the prior fiscal quarter. The Senior Secured Credit Facility includes various customary restrictive covenants, including restrictions related to the ratio of secured debt to earnings before interest expense, taxes, depreciation and amortization (net leverage ratio) and the ratio of earnings before interest expense, taxes, depreciation and amortization to interest expense (coverage ratio). The calculation of secured debt in our net leverage ratio excludes borrowings under the 2024 Receivables Financing Agreement, up to a maximum of $425.0 million.

We were in compliance with all covenants and restrictions under all our outstanding credit agreements as of the date of the amendment, and no event of default had occurred that would permit the lenders under our outstanding credit agreements to accelerate the debt if not cured. In the future, our ability to generate sufficient operating cash flows, among other factors, will determine the amounts available to be borrowed under these facilities. As a result of our restrictive covenant related to the net leverage ratio, the maximum additional borrowings available to us could be limited in the future. The limitation, if an amendment or waiver from our lenders is not obtained, could restrict our ability to borrow the maximum amounts available under the Senior Secured Revolving Credit Facility and the 2024 Receivables Financing Agreement.

We believe, based on current and projected levels of cash flow from our operations, together with our cash and cash equivalents on h and and the availability to borrow under our Senior Secured Revolving Credit Facility and 2024 Receivables Financing Agreement, we have the ability to access sufficient liquidity to meet our short-term and long-term needs, to make required payments of interest on our debt, fund our operating needs, working capital and our capital expenditure requirements, and comply with the financial ratios and other covenants and restrictions in our debt agreements.

On December 11, 2024, our Board of Directors approved a share repurchase program with a $1.3 billion authorization (2024 Repurchase Authorization). On July 28, 2022, our Board of Directors authorized a share repurchase program for the

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purchase of shares of common stock at an aggregate price of up to $2.0 billion (2022 Repurchase Authorization). The 2024 Repurchase Authorization and 2022 Repurchase Authorization will terminate upon the purchase of $1.3 billion and $2.0 billion of common stock, respectively.

For the year ended December 31, 2025, 2.2 million shares of common stock were repurchased and retired at a total value of $50.5 million. As of December 31, 2025, a cumulative total of 27.4 million shares have been repurchased and retired at a total value of $1,351.1 million under the 2022 Repurchase Authorization program, and $1,948.9 million of common stock remained authorized to be repurchased under the 2022 Repurchase Authorization and 2024 Repurchase Authorization programs.

On November 20, 2024, we entered into a $500.0 million receivables financing agreement (2024 Receivables Financing Agreement), which increased the borrowing limit of our then-existing $425.0 million receivables financing agreement (2022 Receivables Financing Agreement) by $75.0 million and extended the maturity date from October 14, 2025 to November 19, 2027 (collectively, the Receivables Financing Agreements).

Under the Receivables Financing Agreements, our eligible trade receivables are used for collateralized borrowings and continue to be serviced by us. In addition, the Receivables Financing Agreements incorporate the net leverage ratio covenant that is contained in the 2025 Senior Credit Facility. On February 19, 2026, the 2024 Receivables Financing Agreement incorporated the net leverage ratio covenant relief that is contained in the Senior Secured Credit Facility. As of December 31, 2025 and 2024, we had $340.0 million and $475.0 million, respectively, drawn under the Receivables Financing Agreements. As of December 31, 2025, $588.8 million of our trade receivables were pledged as collateral and we had $105.5 million of additional borrowing capacity under the 2024 Receivables Financing Agreement, which was subject to the maximum additional borrowings noted above and limited by our borrowing base.

As part of the 2024 Receivables Financing Agreement, we terminated our trade accounts receivable factoring arrangements (AR Facilities), under which certain of our domestic and international subsidiaries could sell their accounts receivable. These receivables had qualified for sales treatment under ASC 860 “Transfers and Servicing” and, accordingly, the proceeds were included in net cash provided by operating activities in the consolidated statements of cash flows.

The following table summarizes the AR Facilities activity:

December 31,

AR Facilities

Beginning balance

Gross receivables sold

Payments received from customers on sold accounts

Ending balance

The factoring discount paid under the AR Facilities was recorded as interest expense on the consolidated statements of operations. The factoring discount for the year ended December 31, 2024 was $3.0 million.

We have registered the sale of an undetermined number of securities with the SEC, so that, from time-to-time, we may issue, offer and sell debt securities, preferred stock, common stock and/or warrants to purchase any such securities pursuant to a registration statement.

Credit Ratings

We receive ratings from three independent credit rating agencies: Fitch Ratings (Fitch), Moody's Investor Service (Moody's) and Standard & Poor's (S&P). The following table summarizes our credit ratings as of February 19, 2026:

Credit Rating Agency

Long-term Rating

Outlook

Fitch Ratings

BBB-

Stable

Moody’s Investors Service

Negative

Standard & Poor’s

Negative

On February 18, 2026, S&P downgraded Olin to BB (from BB+) and affirmed its negative outlook. On January 14, 2026, Fitch affirmed Olin’s BBB- rating and stable outlook. On November 20, 2025, Moody’s affirmed Olin’s Ba1 rating and revised its outlook from stable to negative.

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Contractual Obligations

Our current debt structure is used to fund our business operations. As of December 31, 2025, we had long-term borrowings, including the current installment, of $2,827.3 million, of which $1,060.8 million was at variable rates. We expect to meet our contractual obligations through our normal sources of liquidity and believe we have the financial resources to satisfy these contractual obligations.

We have several defined benefit pension and defined contribution plans, as described in Note 12, “Pension Plans,” and Note 16, “Defined Contribution Plans,” in the notes to consolidated financial statements, contained in Item 8—“Financial Statements and Supplementary Data.” We fund the defined benefit pension plans based on the minimum amounts required by law plus such amounts we deem appropriate. Given the inherent uncertainty as to actual minimum funding requirements for qualified defined benefit pension plans, no amounts are included in this table for any period beyond one year for the domestic qualified defined benefit plan. Based on the current funding requirements, we will not be required to make any cash contributions to the domestic qualified defined benefit pension plan at least through 2026. We also have postretirement healthcare plans that provide health and life insurance benefits to certain retired employees and their beneficiaries, as described in Note 13, “Postretirement Benefits,” in the notes to consolidated financial statements contained in Item 8—“Financial Statements and Supplementary Data.” The defined contribution and other postretirement plans are not prefunded, and expenses are paid by us as incurred.

Our long-term contractual commitments associated with debt, contingent tax liabilities, pension and other postretirement benefits consisted of the following:

Payments Due by Period

Less than 1 Year

1-3 Years

3-5 Years

More than 5 Years

Total

Contractual Commitments

($ in millions)

Debt obligations (1)

Interest payments under debt obligations (2)

Contingent tax liability

International qualified pension plan payments (3)

Non-qualified pension plan payments

Postretirement benefit payments

Total

(1) Excludes unamortized debt issuance costs of $18.1 million at December 31, 2025. All debt obligations are assumed to be held until maturity.

(2) For the purposes of this table, we have assumed for all periods presented that there are no changes in the interest rates from those in effect at December 31, 2025, which ranged from 4.7% to 6.6%.

(3) These amounts are only estimated benefit payments for our foreign qualified pension plans, assuming a weighted average annual expected rate of return on pension plan assets of 4.2% and a discount rate on pension plan obligations of 4.0%. These estimated payments are subject to significant variation and the actual payments may be more than the amounts estimated. In connection with our international qualified defined benefit pension plans we made cash contributions of $0.7 million, $1.3 million and $1.0 million in 2025, 2024 and 2023, respectively, and we anticipate less than $5 million of cash contributions to international qualified defined benefit pension plans in 2026.

Non-cancelable operating leases and purchasing commitments are utilized in our normal course of business for our projected needs. Our operating lease commitments as described in Item 8—“Financial Statements and Supplementary Data,” Note 21, “Leases,” in the notes to the consolidated financial statements, are primarily for railcars, but also include logistics, manufacturing, storage, real estate, and information technology assets. Virtually none of our lease agreements contain escalation clauses or step rent provisions. We also have supply contracts with various third parties for certain raw materials, including ethylene, electricity, propylene and cumene. These contracts have initial terms ranging from several to 20 years. Our long-term contractual commitments associated with operating leases and purchasing commitments consisted of the following:

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Payments Due by Period

Less than 1 Year

1-3 Years

3-5 Years

More than 5 Years

Total

Lease and Purchase Commitments

($ in millions)

Lease Commitments

Operating leases

Purchase Commitments

Raw materials / utilities

Capital expenditures

Total purchase commitments

Other Guarantees

We also have standby letters of credit outstanding of $161.4 million of which $0.4 million have been issued under our 2025 Revolving Credit Facility. The letters of credit were used to support certain long-term debt, workers compensation in surance policies, plant closure and post-closure obligations, international payment obligations and international pension funding requi rements.

CRITICAL ACCOUNTING ESTIMATES

Our discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, sales and expenses, and related disclosure of contingent assets and liabilities. Significant estimates in our consolidated financial statements include goodwill recoverability, environmental, restructuring and other unusual items, litigation, income tax reserves including deferred tax asset valuation allowances, pension, postretirement and other benefits and allowance for doubtful accounts. We base our estimates on prior experience, current facts and circumstances and other assumptions. Actual results may differ from these estimates.

We believe the following critical accounting estimates are the more significant judgments used in the preparation of the consolidated financial statements.

Goodwill

Goodwill is not amortized, but is reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred. ASC 350 “Intangibles—Goodwill and Other” permits entities to make a qualitative assessment of whether it is more likely than not that a reporting unit’s fair value is less than its carrying amount before applying a quantitative goodwill impairment test. Circumstances that are considered as part of the qualitative assessment and could trigger a quantitative impairment test include, but are not limited to: a significant adverse change in the business climate; a significant adverse legal judgment; adverse cash flow trends; an adverse action or assessment by a government agency; unanticipated competition; sustained decline in our stock price; and a significant restructuring charge within a reporting unit. We define reporting units at the business segment level or one level below the business segment level. For purposes of testing goodwill for impairment, goodwill has been allocated to our reporting units to the extent it relates to each reporting unit.

It is our practice, at a minimum, to perform a quantitative goodwill impairment test in the fourth quarter every three years. In the fourth quarter of 2023, we performed our triennial quantitative goodwill impairment test for our reporting units. We use a discounted cash flow approach to develop the estimated fair value of a reporting unit when a quantitative review is performed. Management judgment is required in developing the assumptions for the discounted cash flow model. We also corroborate our discounted cash flow analysis by evaluating a market-based approach that considers earnings before interest, taxes, depreciation and amortization (EBITDA) multiples from a representative sample of comparable public companies. As a further indicator that each reporting unit has been valued appropriately using a discounted cash flow model, the aggregate fair value of all reporting units is reconciled to the total market value of Olin. An impairment would be recorded if the carrying amount of a reporting unit exceeded the estimated fair value. Based on the aforementioned analysis, the estimated fair value of our reporting units exceeded the carrying value of the reporting units.

Fair value determinations require considerable judgment and are sensitive to changes in underlying assumptions, estimates and market factors. The discount rate, profitability assumptions and terminal growth rate of our reporting units and the supply and demand fundamentals of the chlor alkali industry are material assumptions utilized in the discounted cash flow model used to estimate the fair value of each reporting unit. The discount rate reflects a weighted-average cost of capital, which

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is calculated, in part based on observable market data. Some of this data (such as the risk free or treasury rate and the pretax cost of debt) are based on the market data at a point in time. Other data (such as the equity risk premium) are based upon market data over time for a peer group of companies in the chemical manufacturing or distribution industries with a market capitalization premium added, as applicable. Also factoring into the discount rate is a market participant’s perceived risk (such as the company specific risk premium) in the valuation implied by the sustained reduction in our stock price.

The discounted cash flow analysis requires estimates, assumptions and judgments about future events. Our analysis uses our internally generated long-range plan. Specifically, the assumptions in our long-range plan about terminal growth rates, forecasted capital expenditures and changes in future working capital requirements are used to determine the estimated fair value of each reporting unit. The long-range plan reflects management judgment, supplemented by independent chemical industry analyses which provide multi-year chlor alkali industry operating and pricing forecasts.

As a further indicator that each reporting unit has been valued appropriately using a discounted cash flow model, the aggregate fair value of all reporting units is reconciled to the total market value of Olin. We believe the assumptions used in our goodwill impairment analysis are appropriate and result in reasonable estimates of the implied fair value of each reporting unit. However, given the economic environment and the uncertainties regarding the impact on our business, there can be no assurance that our estimates and assumptions, made for purposes of our goodwill impairment testing, will prove to be an accurate prediction of the future.

Environmental

Accruals (charges to income) for environmental matters are recorded when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated, based on current law and existing technologies. These amounts, which are not discounted and are exclusive of claims against third parties, are adjusted periodically as assessments and remediation efforts progress or additional technical or legal information becomes available. Environmental costs are capitalized if the costs increase the value of the property and/or mitigate or prevent contamination from future operations. Environmental costs and recoveries are included in costs of goods sold.

Environmental exposures are difficult to assess for numerous reasons, including the identification of new sites, developments at sites resulting from investigatory studies, advances in technology, changes in environmental laws and regulations and their application, changes in regulatory authorities, the scarcity of reliable data pertaining to identified sites, the difficulty in assessing the involvement and financial capability of other potentially responsible parties (PRPs) and our ability to obtain contributions from other parties and the lengthy time periods over which site remediation occurs. It is possible that some of these matters (the outcomes of which are subject to various uncertainties) may be resolved unfavorably to us, which could materially adversely affect our financial position, cash flows or results of operations.

NEW ACCOUNTING PRONOUNCEMENTS

Discussion of new accounting pronouncements can be referred to under Item 8—“Financial Statements and Supplementary Data,” within Note 3, “Recent Accounting Pronouncements” of our notes to consolidated financial statements.

DERIVATIVE FINANCIAL INSTRUMENTS

We are exposed to market risk in the normal course of our business operations due to our purchases of certain commodities, our ongoing investing and financing activities and our operations that use foreign currencies. The risk of loss can be assessed from the perspective of adverse changes in fair values, cash flows and future earnings. We have established policies and procedures governing our management of market risks and the use of financial instruments to manage exposure to such risks. ASC 815 “Derivatives and Hedging” (ASC 815) requires an entity to recognize all derivatives as either assets or liabilities in the consolidated balance sheets and measure those instruments at fair value. In accordance with ASC 815, we designate derivative contracts as cash flow hedges of forecasted purchases of commodities and forecasted interest payments related to variable-rate borrowings and designate certain interest rate swaps as fair value hedges of fixed-rate borrowings. We do not enter into any derivative instruments for trading or speculative purposes.

Energy costs, including electricity and natural gas, and certain raw materials used in our production processes are subject to price volatility. Depending on market conditions, we may enter into futures contracts, forward contracts, commodity swaps and put and call option contracts in order to reduce the impact of commodity price fluctuations. The majority of our commodity derivatives expire within one year.

For derivative instruments that are designated and qualify as a cash flow hedge, the change in fair value of the derivative is recognized as a component of other comprehensive income (loss) until the hedged item is recognized in earnings.

We use cash flow hedges for certain raw material and energy costs such as copper, zinc, ethane, electricity and natural gas to provide a measure of stability in managing our exposure to price fluctuations associated with forecasted purchases of raw materials and energy used in our manufacturing process. Settlements on commodity derivative contracts resulted in gains

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(losses) of $16.6 million, $(30.6) million, and $(72.5) million in 2025, 2024, and 2023, respectively, which were included in cost of goods sold. At December 31, 2025, we had open derivative notional contract positions through 2028 totaling $218.6 million. If all open futures contracts had been settled on December 31, 2025, we would have recognized a pretax gain of $7.8 million.

If commodity prices were to remain at December 31, 2025 levels, approximately $3.5 million of deferred gains, net of tax, would be reclassified into earnings during the next twelve months. The actual effect on earnings will be dependent on actual commodity prices when the forecasted transactions occur.

We use interest rate swaps as a means of minimizing cash flow fluctuations that may arise from volatility in interest rates of our variable-rate borrowings. We also use interest rate swaps as a means of managing interest expense and floating interest rate exposure to optimal levels. For derivative instruments that are designated and qualify as a fair value hedge, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in current earnings. We include the gain or loss on the hedged items (fixed-rate borrowings) in the same line item, interest expense, as the offsetting loss or gain on the related interest rate swaps. There were no outstanding interest rate swaps at December 31, 2025 and 2024.

We actively manage currency exposures that are associated with net monetary asset positions, currency purchases and sales commitments denominated in foreign currencies and foreign currency denominated assets and liabilities created in the normal course of business. We enter into forward sales and purchase contracts to manage currency risk to offset our net exposures, by currency, related to the foreign currency denominated monetary assets and liabilities of our operations. All of the currency derivatives expire within one year and are for USD equivalents. The counterparties to the forward contracts are large financial institutions; however, the risk of loss to us in the event of nonperformance by a counterparty could impact our financial position or results of operations. We had the following notional amounts of outstanding forward contracts to buy and sell foreign currency:

December 31,

Foreign Currency

($ in millions)

Buy

Sell

Our foreign currency forward contracts and certain commodity derivatives did not meet the criteria to qualify for hedge accounting. The effect on operating results of items not qualifying for hedge accounting was a (loss) gain of $(16.8) million, $17.0 million and $(15.7) million in 2025, 2024 and 2023, respectively.

The fair value of our derivative asset and liability balances were:

December 31,

Derivative Assets and Liabilities

($ in millions)

Other current assets

Other assets

Total derivative asset

Accrued liabilities

Other liabilities

Total derivative liability