OLN: Financial results

Item 2.02. Results of Operations and Financial Condition. On July 30, 2026, Olin Corporation (“Olin”) issued a press release announcing financial results for the second quarter ended June 30, 2026. Attached as Exhibit 99.1, and incorporated by reference into this Item 2.02, is a copy of Olin’s press release dated July 30, 2026. Item 9.01. Financial Statements and Exhibits. (d) Exhibit No. Exhibit 99.1 Press Release announcing second quarter 2026 earnings, dated July 30 , 2026 104 Cover Page Interactive Data File (embedded within the Inline XBRL document) SIGNATURE 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: Vice President, Deputy General Counsel and Secretary Date: July 30, 2026