OLN: Company disclosure

Item 7.01 Regulation FD Disclosure On August 25, 2026, Olin and Huntsman issued a joint press release announcing the preliminary results of the Special Meeting and the preliminary results of a special meeting of Huntsman’s stockholders also held on August 25, 2026. A copy of the joint press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Based on the voting results at the Special Meeting and at the special meeting of Huntsman stockholders, and assuming satisfaction of all other conditions to closing, the parties will implement the business combination through the Direct Merger. The information in this Item 7.01, including Exhibit 99.1, is being furnished to the SEC and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “ Exchange Act ”), or otherwise subject to the liabilities of that section, and shall not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by a specific reference in such filing. Item 9.01 Financial Statements and Exhibits (d) Exhibits. Exhibit Number Exhibit Description 99.1 Joint Press Release, dated August 25, 2026. 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 Date: August 25, 2026 By: /s/ Inchan Hwang Vice President, Deputy General Counsel and Secretary