OLN: Material agreement · Other company developments

Item 1.01 Entry into a Material Definitive Agreement. Merger Agreement On June 15, 2026, Olin Corporation, a Virginia corporation (“ Olin ” or, with reference to the post-closing period, the “ Combined Company ”), entered into an Agreement and Plan of Merger (the “ Merger Agreement ”) with Huntsman Corporation, a Delaware corporation (“ Huntsman ”), Olympus Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of Olin (“ First Merger Sub ”), and Hook Merger Sub LLC, a Delaware limited liability company and a direct wholly owned subsidiary of Olin (“ Second Merger Sub ”). The Transactions The Merger Agreement provides for the combination of Olin and Huntsman in an all-stock merger of equals transaction, pursuant to which, either (a) upon the terms and subject to the conditions set forth in the Merger Agreement and the plan of merger in the form attached thereto (the “ Plan of Merger ”), Huntsman will merge with and into Olin (the “ Direct Merger ”), with Olin as the surviving entity or (b) upon the terms and subject to the conditions set forth in the Merger Agreement (i) First Merger Sub will be merged with and into Huntsman (the “ First Subsidiary Merger ”), with Huntsman surviving as a direct wholly owned subsidiary of Olin (the “ Initial Surviving Company ”), and (ii) immediately following the First Subsidiary Merger, and as part of the same overall transaction as the First Subsidiary Merger, the Initial Surviving Company will be merged with and into Second Merger Sub (the “ Second Subsidiary Merger ” and, together with the First Subsidiary Merger, the “ Subsidiary Mergers ”), with Second Merger Sub surviving as a direct wholly owned subsidiary of Olin (the “ Final Surviving Company ”). The Direct Merger or the Subsidiary Mergers, as applicable