Executive Change

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 30, 2024 OLIN CORPORATION (Exact name of registrant as specified in its charter) Virginia 1-1070 13-1872319 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.) 190 Carondelet Plaza, Suite 1530 Clayton, MO 63105 (Address of principal executive offices) (Zip Code) ( 314 ) 480-1400 (Registrant’s telephone number, including area code) (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol Name of each exchange on which registered Common Stock, $1.00 par value per share OLN New York Stock Exchange Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). ☐ Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. Olin Corporation Supplemental Retirement Savings Plan On September 30, 2024, the Benefit Plan Review Committee (the “Committee”) of Olin Corporation (the “Corporation”) amended and restated the Olin Corporation Supplemental Contributing Employee Ownership Plan (the “Supplemental Plan”), generally effective January 1, 2024. The amendment and restatement of the Supplemental Plan renames the Supplemental Plan, effective October 1, 2024, as the Olin Corporation Supplemental Retirement Savings Plan and reflects certain discretionary changes. Specifically, the amendment and restatement (i) revises certain investment election and investment option provisions to align with the Olin Corporation Retirement Savings Plan, the Corporation’s tax-qualified retirement plan, (ii) permits the Corporation to establish a rabbi trust for purposes of funding the Supplemental Plan, and (iii) makes certain other changes to clarify the Supplemental Plan’s operation. The above description is intended to be a summary of the material updated terms of the amended and restated Supplemental Plan and is subject to and qualified in its entirety by reference to the full text of the Supplemental Plan, which is filed as Exhibit 10.1 to this Current Report on Form 8-K and incorporated herein by reference. Item 9.01. Financial Statements and Exhibits. (d) Exhibit No. Exhibit 10.1 Olin Corporation Supplemental Retirement Savings Plan 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 Corporate Secretary Date: October 1, 2024