OLN: Material agreement

Item 1.01. Entry into a Material Definitive Agreement. Second Amendment to Receivables Purchase Agreement On November 4, 2026, Olin Finance Company, LLC, a wholly owned subsidiary of the Registrant (the “Seller”), and the Registrant, as servicer and performance guarantor, entered into Amendment No. 2 to Receivables Purchase Agreement and Reaffirmation of Performance Guaranty (the “RPA Amendment”) with PNC Bank, National Association, as administrative agent, the purchasers and group agents party thereto and PNC Capital Markets LLC, as structuring agent. The RPA Amendment amends the Receivables Purchase Agreement, dated as of November 20, 2024, to, among other things, extend the scheduled termination date to July 31, 2028. The foregoing description of the RPA Amendment does not purport to be complete and is qualified in its entirety by reference to the full text of the RPA Amendment, which is attached hereto as Exhibit 10.1 and which is incorporated by reference herein. Item 9.01. Financial Statements and Exhibits (d) Exhibits. Exhibit Number Exhibit Description 10.1 Amendment No. 2 to Receivables Purchase Agreement and Reaffirmation of Performance Guaranty, dated as of November 4, 2026, among Olin Finance Company, LLC, as seller, Olin Corporation, as servicer and performance guarantor, PNC Bank, National Association, as administrative agent, the purchasers and group agents party thereto and PNC Capital Markets LLC, as structuring agent. 104 The cover page from this Current Report on Form 8-K, formatted in Inline XBRL. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. OLIN CORPORATION By: /s/ Inchan Hwang Name: Inchan Hwang Title