INVESTOR DAY D E C E M B E R 1 2 , 2 0 2 4

2 0 2 4 I N V E S T O R D A Y Welcome and Opening Remarks Steve Keenan Director, Investor Relations 2

2 0 2 4 I N V E S T O R D A Y Safety Moment – Location of Emergency Exit and Restrooms 3 EMERGENCY EXIT STAIRS RESTROOMS EMERGENCY EXIT STAIRS

2 0 2 4 I N V E S T O R D A Y Forward-looking Statements 4 This presentation includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These statements relate to analyses and other information that are based on management's beliefs, certain assumptions made by management, forecasts of future results, and current expectations, estimates and projections about the markets and economy in which we and our various segments operate. The statements contained in this communication that are not statements of historical fact may include forward-looking statements that involve a number of risks and uncertainties. We use separate “outlook” sections, reference future phases of Olin’s evolution, and use the words "anticipate," "intend," "may," "expect," "believe," "should," "plan," "outlook," "project," "estimate," "forecast," "optimistic," “target,” and variations of such words and similar expressions in this presentation to identify such forward-looking statements. These statements include, but are not limited to, statements regarding the Company’s intent to repurchase, from time to time, the Company’s common stock. These statements are not guarantees of future performance and involve certain risks, uncertainties, and assumptions, which are difficult to predict and many of which are beyond our control. Therefore, actual outcomes and results may differ materially from those matters expressed or implied in such forward-looking statements. We undertake no obligation to update publicly any forward-looking statements, whether as a result of future events, new information or otherwise. The payment of 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 conditions, 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. All references to expectations and other forward-looking statements are based on expectations as of the date of this communication. Olin undertakes no obligation to update publicly any forward-looking statements, whether as a result of future events, new information or otherwise. Factors that could cause or contribute to such differences include, but are not limited to: sensitivity to economic, business and market conditions in the United States and overseas, including economic instability or a downturn in the sectors served by us; declines in average selling prices for our products and the supply/demand balance for our products, including the impact of excess industry capacity or an imbalance in demand for our chlor alkali products; unsuccessful execution of our strategic operating model, which prioritizes Electrochemical Unit (ECU) margins over sales volumes; failure to identify, attract, develop, retain and motivate qualified employees throughout the organization and ability to manage executive officer and other key senior management transitions; failure to control costs and inflation impacts or failure to achieve targeted cost reductions; our reliance on a limited number of suppliers for specified feedstock and services and our reliance on third-party transportation; the occurrence of unexpected manufacturing interruptions and outages, including those occurring as a result of labor disruptions and production hazards; exposure to physical risks associated with climate-related events or increased severity and frequency of severe weather events; availability of and/or higher-than-expected costs of raw material, energy, transportation, and/or logistics; the failure or an interruption, including cyber-attacks, of our information technology systems; our inability to complete future acquisitions or joint venture transactions or successfully integrate them into our business; risks associated with our international sales and operations, including economic, political or regulatory changes; our indebtedness and debt service obligations; weak industry conditions affecting our ability to comply with the financial maintenance covenants in our senior credit facility; adverse conditions in the credit and capital markets, limiting or preventing our ability to borrow or raise capital; the effects of any declines in global equity markets on asset values and any declines in interest rates or other significant assumptions used to value the liabilities in, and funding of, our pension plans; our long-range plan assumptions not being realized, causing a non-cash impairment charge of long-lived assets; changes in, or failure to comply with, legislation or government regulations or policies, including changes regarding our ability to manufacture or use certain products and changes within the international markets in which we operate; new regulations or public policy changes regarding the transportation of hazardous chemicals and the security of chemical manufacturing facilities; unexpected outcomes from legal or regulatory claims and proceedings; costs and other expenditures in excess of those projected for environmental investigation and remediation or other legal proceedings; various risks associated with our Lake City U.S. Army Ammunition Plant contract and performance under other governmental contracts; and failure to effectively manage environmental, social and governance (ESG) issues and related regulations, including climate change and sustainability and the other risks detailed in Olin’s Form 10-K for the fiscal year ended December 31, 2023 and in Olin’s Quarterly Reports on Form 10-Q and other reports furnished or filed with the U.S. Securities and Exchange Commission. All of our forward-looking statements should be considered in light of these factors. In addition, other risks and uncertainties not presently known to us or that we consider immaterial could affect the accuracy of our forward- looking statements. The reader is cautioned not to rely unduly on these forward-looking statements. Non-GAAP Financial Measures: In addition to U.S. GAAP financial measures, this presentation includes certain non-GAAP financial measures including EBITDA and Adjusted EBITDA. These non-GAAP measures are in addition to, not a substitute for or superior to, measures for financial performance prepared in accordance with U.S. GAAP. Definitions of these measures and reconciliation of GAAP to non-GAAP measures are provided in the appendix to this presentation.

2 0 2 4 I N V E S T O R D A Y Today’s Agenda 5 9:00 AM Welcome & Opening Remarks STEVE KEENAN | Director, Investor Relations Company Overview & Strategic Vision Unlocking the Potential of Our Portfolio through a Disciplined Value Creation Strategy KEN LANE | President & CEO Chlor Alkali Products & Vinyls Overview Continuing Value-first Approach and Capitalizing on Our Industry-leading Positions DEON CARTER | VP & President, CAPV Epoxy Overview Leveraging Integrated Value Chain Position to Restore Resiliency and Improve Earnings FLORIAN KOHL | VP & President, Epoxy & International Chemicals 10:15 AM Break 10:30 AM Winchester Overview An Industry-leading, Well-recognized Global Brand Delivering Innovative Ammunition Solutions BRETT FLAUGHER | VP & President, Winchester Financial Overview & Long-term Outlook Executing a Disciplined Financial Strategy Focused on Value Creation and Resiliency TODD SLATER | SVP & CFO Closing Remarks | Invest with Us KEN LANE | President & CEO 11:15 AM Q&A Session 12:00 PM Leadership Luncheon

2 0 2 4 I N V E S T O R D A Y Olin Corporate Purpose Video 6

2 0 2 4 I N V E S T O R D A Y Unlocking the Potential of Our Portfolio through a Disciplined Value Creation Strategy Company Overview and Strategic Vision Ken Lane President & CEO 7

2 0 2 4 I N V E S T O R D A Y Delivering Shareholder Value 1 Building on a robust foundation as a global chemicals and ammunition industry leader by executing commercial discipline, cost efficiency, and our value creation strategy 2 Realizing a higher level of profitability in chlor alkali while positioning to maximize value potential and growth in adjacencies 3 Optimizing Epoxy business to restore resiliency and improve earnings while growing formulated solutions 4 Capturing full value of legendary Winchester brand through organic growth and adjacency opportunities 5 Maintaining investment grade credit rating that enables Olin to consistently return cash to shareholders while providing optionality to invest in high-return growth opportunities 8

2 0 2 4 I N V E S T O R D A Y We Deliver Essential Materials and Solutions that Enhance and Protect Lives Olin at a Glance 1 As of 12/6/24. 2 As of 12/31/23 and includes corporate employees. 3 Includes addback of ~$110M from Hurricane Beryl impact. 4 Since 2015. CHLOR ALKALI PRODUCTS & VINYLS EPOXY WINCHESTER OPERATE IN THREE BUSINESS SEGMENTS ~$4.8B Market Cap1 OLN Ticker (NYSE) Clayton, MO Corporate HQ 1892 Founded ~47% Operating Cash Flows Returned to ~$1.0B TTM 3Q 2024 Adjusted EBITDA3 29 Manufacturing Facilities2 ~7,300 Global Employees2 Shareholders4 9

2 0 2 4 I N V E S T O R D A Y Cycle-tested Leadership Team Right Leaders in the Right Places to Execute Strategy for Profitable Growth Dana O’Brien Damian Gumpel Teri Vermillion Nicki Sumner Holger Baer Verghese Thomas Valerie Peters SVP & Chief Legal Officer 2021 VP, Corporate Strategy 2008 VP & Treasurer 2010 VP & Controller 2005 VP, Global Chemicals Mfg., Engineering, & EHS 1989 VP, Chief Innovation & Sustainability Officer 2022 VP, Chief Human Resources Officer 1991 Today’s Presenters Broader Leadership Team 300 Years of Combined Industry Experience with an Average Olin Tenure of 17 Years Ken Lane Todd Slater Deon Carter Florian Kohl Brett Flaugher President & CEO 2024 SVP & CFO 1992 VP & President, CAPV 2024 VP & President, Epoxy & International Chemicals 2023 VP & President, Winchester 1983 10

2 0 2 4 I N V E S T O R D A Y Products End Markets Served Our Core Business Portfolio Note: Percentages are based on % of total TTM 3Q 2024 Sales. Chlor Alkali Products & Vinyls Largest supplier of chlor alkali products Caustic Soda • Chlorine • Vinyls • Hydrochloric Acid • Chlorinated Organics • Bleach • Hydrogen • Potassium Hydroxide Ag • Pharma • Automotive • Water Treatment • Housing and Construction • Renewable Energy • Consumer Goods • Paper Liquid Epoxy Resins • Aromatics • Allylics • Curing Agents and Hardeners • Formulated Solutions • Reactive Diluents • Solid Epoxy Resins Civil Engineering • Construction • Consumer Goods • Electronics • Energy (including Wind) • Transportation Ammunition and Components for: Rifle • Pistol • Rimfire • Shotshell • White Flyer® Clay Targets Commercial • Industrial • Defense • Law Enforcement Epoxy Integrated and reliable source of supply and industry-leading epoxy technology 55% 19% 26% Winchester One of the world’s leading small-caliber ammunition brands 11

2 0 2 4 I N V E S T O R D A Y Addressable Market 5-Year Industry CAGR CAPV ~$90B ~3% Epoxy ~$12B ~5% Winchester ~$5B ~6% ~$107B 2024 Total Addressable Market (TAM) Large Addressable Market with Opportunities for Profitable Growth Leverage Leading Positions in Key Markets to Realize Value Growth Source: Roland Berger, CMA, and Olin Marketing Information. 12 Unlocking Value in Our Markets Served through Clear Competitive Advantages • Deep chemicals expertise with ability to apply across entire portfolio • Fully integrated across chlorine value chain with low-cost production • Global scale and reach with ample, flexible capability • Century-old brands with significant global awareness and recognition

2 0 2 4 I N V E S T O R D A Y We Are Deeply Committed to a Value-first Commercial Strategy Illustrative Profitability ■ Cycle with Value-first Approach ■ Traditional Cycle Midpoint in Traditional Cycle Midpoint in Value-first Approach Peak WE ARE HERE Lower Volume to Preserve Margins Trough Significant Profit Upside 13

2 0 2 4 I N V E S T O R D A Y Our Long-term Value Creation Strategy O P T I M I Z E TH E C OR E G R O W TH E C OR E 14

2 0 2 4 I N V E S T O R D A Y Continued Commitment to Capturing Cost Savings Achieving Cost Reduction Benefits and Enhancing Leading Competitive Position 15 Clear, Capital-light Priorities • Rightsizing CAPV and Epoxy manufacturing facilities to align with loaded spring approach • Accelerating a performance-driven culture focused on safety, reliability, and productivity • Leveraging continuous improvement and operational excellence initiatives GROWOPTIMIZE T H E C O R E Driving Efficiency While Maintaining Growth Optionality >$250M Total Structural Cost Savings by 2028

2 0 2 4 I N V E S T O R D A Y Efficiency Efforts Advance Our Sustainability Initiatives More to Come in Expanded 2024 Sustainability Report to be Published in 2Q 2025 2018 Baseline Measurement 2030 Current Reduction Target 2030 NEW Reduction Targets Scope 1 & 2 Emissions 6.8M MT 25% 35% Water Consumption 9.6B GALS 15% 25% Introducing New Sustainability Targets as a Result of Asset Optimization Increasing our 2030 Scope 1 and 2 emissions reduction target • Implement several high financial return projects that also reduce carbon emissions Increasing our 2030 water consumption reduction target 16 GROWOPTIMIZE T H E C O R E