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 o…

Other Events. As previously disclosed, on June 15, 2026, Olin Corporation, a Virginia corporation (“ Olin ”), 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 ”),…

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.

Regulation FD Disclosure On June 16, 2026, Olin Corporation, a Virginia corporation (“ Olin ”), and Huntsman Corporation, a Delaware corporation (“ Huntsman ”), issued a joint press release to announce the proposed combination of Olin and Huntsman in an all-stock merger of equals transaction pursuant to an Agreement and Plan of Merger entered into on June 15, 2026. A copy of the press release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by r…

Other Events. Voting and Support Agreements On June 15, 2026, concurrently with the execution of the Merger Agreement, Olin, First Merger Sub and Second Merger Sub entered into a voting and support agreement (the “ Voting and Support Agreement ”) with Peter Huntsman and affiliated entities (collectively, the “ Holders ”), in their capacity as a stockholder of Huntsman, pursuant to which and subject to the conditions contained therein, each Holder has agreed, among other things, to vote all of…

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 l…

Results of Operations and Financial Condition. On May 7, 2026, Olin Corporation (“Olin”) issued a press release announcing financial results for the first quarter ended March 31, 2026. Attached as Exhibit 99.1, and incorporated by reference into this Item 2.02, is a copy of Olin’s press release dated May 7, 2026.

Regulation FD Disclosure. On April 29, 2026, Olin’s Board of Directors declared a quarterly dividend of $0.20 on each share of Olin common stock. The dividend is payable on June 12, 2026 to shareholders of record at the close of business on May 14, 2026. This marks Olin’s 398th consecutive quarterly dividend.

The filing describes the approval of a new long-term incentive plan and related award agreements, which are routine corporate actions.

Regulation FD Disclosure. On February 19, 2026, Olin’s Board declared a quarterly dividend of $0.20 on each share of Olin common stock. The dividend is payable on March 13, 2026 to shareholders of record at the close of business on March 3, 2026. This marks Olin’s 397th consecutive quarterly dividend.

Results of Operations and Financial Condition. On February 12, 2026, Olin Corporation (“Olin”) issued a press release announcing Olin is taking a fourth quarter 2025 charge following the verdict in the Shintech v. Olin litigation. Attached as Exhibit 99.1, and incorporated by reference into this Item 7.01, is a copy of Olin’s press release dated February 12, 2026.

Results of Operations and Financial Condition. On January 29, 2026, Olin Corporation (“Olin”) issued a press release announcing financial results for the fourth quarter ended December 31, 2025. Attached as Exhibit 99.1, and incorporated by reference into this Item 2.02, is a copy of Olin’s press release dated January 29, 2026.

Results of Operations and Financial Condition. On January 8, 2026, Olin Corporation (the “Registrant”) issued a press release announcing an updated outlook for the fourth quarter ended December 31, 2025. Attached as Exhibit 99.1, and incorporated herein by reference, is a copy of Registrant’s press release dated January 8, 2026.

Regulation FD Disclosure. On November 12, 2025, Olin’s Board declared a quarterly dividend of $0.20 on each share of Olin common stock. The dividend is payable on December 12, 2025 to shareholders of record at the close of business on November 28, 2025. This marks Olin’s 396th consecutive quarterly dividend.

Results of Operations and Financial Condition. On October 27, 2025, Olin Corporation (“Olin”) issued a press release announcing financial results for the third quarter ended September 30, 2025. Attached as Exhibit 99.1, and incorporated by reference into this Item 2.02, is a copy of Olin’s press release dated October 27, 2025.

Regulation FD Disclosure. On August 12, 2025, Olin’s Board of Directors declared a quarterly dividend of $0.20 on each share of Olin common stock. The dividend is payable on September 12, 2025 to shareholders of record at the close of business on August 28, 2025. This marks Olin’s 395th consecutive quarterly dividend.

Results of Operations and Financial Condition. On July 28, 2025, Olin Corporation (“Olin”) issued a press release announcing financial results for the second quarter ended June 30, 2025. Attached as Exhibit 99.1, and incorporated by reference into this Item 2.02, is a copy of Olin’s press release dated July 28, 2025.

Results of Operations and Financial Condition. On May 1, 2025, Olin Corporation (“Olin”) issued a press release announcing financial results for the quarter ended March 31, 2025. Attached as Exhibit 99.1, and incorporated by reference, is a copy of Olin’s press release dated May 1, 2025.

Regulation FD Disclosure. On May 1, 2025, Olin’s Board of Directors declared a quarterly dividend of $0.20 on each share of Olin common stock. The dividend is payable on June 13, 2025 to shareholders of record at the close of business on May 15, 2025. This marks Olin’s 394th consecutive quarterly dividend.

Regulation FD. On April 18, 2025, Olin Corporation issued a press release announcing the completion of the previously announced acquisition of the small caliber ammunition assets of AMMO, Inc. for adjusted cash consideration of $55.8 million reflecting lower than anticipated working capital and other adjustments. The information in this Item 7.01, including Exhibit 99.1 attached hereto, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Ac…

Termination of a Material Definitive Agreement. On March 14, 2025, in connection with the effectiveness of the Replacement Credit Agreement, the Registrant prepaid in full the outstanding aggregate principal amount of all loans, together with all accrued and unpaid interest thereon, under the Existing Credit Agreement and, in connection with such prepayment, the Existing Credit Agreement, including all commitments thereunder, was terminated.

Entry into a Material Definitive Agreement. Indenture On March 14, 2025, Olin Corporation (the “Registrant”) issued $600,000,000 aggregate principal amount of 6.625% Senior Notes due 2033 (the “Senior Notes”) pursuant to an indenture, dated as of March 14, 2025 (the “Indenture), between the Registrant and U.S. Bank Trust Company, National Association, as trustee, governing the Senior Notes. The Senior Notes will mature on April 1, 2033, and will have an interest rate of 6.625%. Interest will…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The disclosure set forth above under

Director — General Edward Daly: The filing discloses the routine election of a new director to the board of directors, which is a standard governance event rather than an executive departure.

The Senior Notes will be offered only to persons reasonably believed to be qualified institutional buyers pursuant to Rule 144A under the Securities Act and to non-U.S. persons outside the United States in reliance on Regulation S under the Securities Act. The Senior Notes have not been registered under the Securities Act and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act and applicable st…