Regulation FD Disclosure. On August 25, 2026, the Company and Olin issued a joint press release announcing the preliminary results of the Special Meeting and the preliminary results of a special meeting of Olin’s shareholders 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 Olin shareholders, and assuming satisfaction of al…

Other Events. As previously disclosed, on June 15, 2026, Huntsman Corporation, a Delaware corporation (“ Huntsman ”), entered into an Agreement and Plan of Merger (the “ Merger Agreement ”) with Olin Corporation, a Virginia corporation (“ Olin ”), 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, we issued a press release announcing our results for the three months ended June 30, 2026. The press release is furnished herewith as Exhibit 99.1. We will hold a conference call to discuss our second quarter 2026 financial results on Friday, July 31, 2026, at 10:00 a.m. ET. Webcast link: https://event.choruscall.com/mediaframe/webcast.html?webcastid=r4UuXqgQ Participant dial-in numbers: Domestic callers: (877) 402-8037 Internat…

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, Huntsman Corporation, a Delaware corporation (“ Huntsman ” or, with reference to the post-closing period, the “ Combined Company ”), entered into an Agreement and Plan of Merger (the “ Merger Agreement ”) with Olin Corporation, a Virginia corporation (“ Olin ”), 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…

Regulation FD Disclosure On June 16, 2026, Huntsman Corporation, a Delaware corporation (“ Huntsman ”), and Olin Corporation, a Virginia corporation (“ Olin ”), 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…

Results of Operations and Financial Condition. On April 30, 2026, we issued a press release announcing our results for the three months ended March 31, 2026. The press release is furnished herewith as Exhibit 99.1. We will hold a conference call to discuss our first quarter 2026 financial results on Friday, May 1, 2026, at 10:00 a.m. ET. Webcast link: https://event.choruscall.com/mediaframe/webcast.html?webcastid=CrqpAfyY Participant dial-in numbers: Domestic callers: (877) 402-8037 Internati…

Results of Operations and Financial Condition. On February 17, 2026, we issued a press release announcing our results for the three months and year ended December 31, 2025. The press release is furnished herewith as Exhibit 99.1. We will hold a conference call to discuss our fourth quarter and full year 2025 financial results on Wednesday, February 18, 2026, at 10:00 a.m. ET. Webcast link: https://event.choruscall.com/mediaframe/webcast.html?webcastid=IMeg0PNW Participant dial-in numbers: Dom…

Entry into a Material Definitive Agreement. On February 9, 2026, Huntsman International LLC (“HI”), a wholly-owned subsidiary of Huntsman Corporation, entered into a Credit Agreement with Citibank, N.A., as Administrative Agent and Collateral Agent, and the lenders thereto, in connection with an $800 million senior secured revolving credit facility (the “Credit Agreement”). HI may increase the credit facility commitments by up to $400 million, plus additional amounts, subject to certain lever…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information included in

Termination of a Material Definitive Agreement. In connection with entering into the Credit Agreement, on February 9, 2026, HI terminated all commitments and repaid all obligations under HI’s existing credit agreement, dated as of May 20, 2022, among HI, Citibank, N.A., as Administrative Agent, and the lenders party thereto (as previously amended, restated, amended and restated, supplemented or otherwise modified).

Entry into a Material Definitive Agreement. On December 29, 2025, Huntsman International LLC (“Huntsman International”) entered into Master Amendment No. 13 to the U.S. Receivables Loan Agreement and Transaction Documents (the “U.S. A/R Program Amendment 13”), among Huntsman International, Huntsman Receivables Finance II LLC, VANTICO GROUP S.à r.1., as master servicer, The Toronto-Dominion Bank (“TD”), as successor administrative agent and successor collateral agent, and the other financial i…

Results of Operations and Financial Condition. On November 6, 2025, we issued a press release announcing our results for the three months ended September 30, 2025. The press release is furnished herewith as Exhibit 99.1. We will hold a conference call to discuss our third quarter 2025 financial results on Friday, November 7, 2025, at 10:00 a.m. ET. Webcast link: https://event.choruscall.com/mediaframe/webcast.html?webcastid=FbX1HK73 Participant dial-in numbers: Domestic callers: (877) 402-803…

Executive Vice President, General Counsel and Secretary — David M. Stryker: Mr. Stryker is retiring and transitioning to a new role within the company, with Ms. Julia Wright being appointed as his successor.

Results of Operations and Financial Condition. On July 31, 2025, we issued a press release announcing our results for the three months ended June 30, 2025. The press release is furnished herewith as Exhibit 99.1. We will hold a conference call to discuss our second quarter 2025 financial results on Friday, August 1, 2025, at 10:00 a.m. ET. Webcast link: https://event.choruscall.com/mediaframe/webcast.html?webcastid=5R7ztW5k Participant dial-in numbers: Domestic callers: (877) 402-8037 Interna…

Entry into a Material Definitive Agreement. On May 23, 2025, Huntsman International LLC entered into a Second Amendment (the “Second Amendment”) to the Credit Agreement, dated as of May 20, 2022, among Huntsman International, as borrower, the lenders party thereto and Citibank, N.A., as Administrative Agent (as amended, the “2022 Revolving Credit Agreement”). The Second Amendment amends the financial covenant regarding the leverage ratio of Huntsman International and its subsidiaries to incre…

Division President, Polyurethanes and CEO Asia Pacific — Tony Hankins: Tony Hankins is transitioning to a new role within the company, and Steen Weien Hansen will take over as Division President, Polyurethanes.

The filing is about the approval of a stock incentive plan, not a management change.

Results of Operations and Financial Condition. On May 1, 2025, we issued a press release announcing our results the three months ended March 31, 2025. The press release is furnished herewith as Exhibit 99.1. We will hold a conference call to discuss our first quarter 2025 financial results on Friday, May 2, 2025, at 10:00 a.m. ET. Webcast link: https://event.choruscall.com/mediaframe/webcast.html?webcastid=J4Z1igJk Participant dial-in numbers: Domestic callers: (877) 402-8037 International ca…

Results of Operations and Financial Condition. On February 17, 2025, we issued a press release announcing our results for the three months and year ended December 31, 2024. The press release is furnished herewith as Exhibit 99.1. We will hold a conference call to discuss our fourth quarter and full year 2024 financial results on Tuesday, February 18, 2025, at 10:00 a.m. ET. Webcast link: https://event.choruscall.com/mediaframe/webcast.html?webcastid=Hmr0Y2Vu Participant dial-in numbers: Domes…

Results of Operations and Financial Condition. On November 4, 2024, we issued a press release announcing our results for the three months ended September 30, 2024. The press release is furnished herewith as Exhibit 99.1. We will hold a conference call to discuss our third quarter 2024 financial results on Tuesday, November 5, 2024, at 10:00 a.m. ET. Webcast link: https://event.choruscall.com/mediaframe/webcast.html?webcastid=52266EEY Participant dial-in numbers: Domestic callers: (877) 402-80…

Entry into a Material Definitive Agreement. On September 24, 2024, Huntsman Corporation’s wholly-owned subsidiary, Huntsman International LLC (the “Issuer”), issued $350,000,000 in aggregate principal amount of its 5.700% Senior Notes due 2034 (the “Notes”), pursuant to the Indenture, dated as of September 26, 2024 (the “Base Indenture”), by and between the Issuer and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”), as supplemented by the First Supplemental Indenture…

Results of Operations and Financial Condition. On August 5, 2024, we issued a press release announcing our results the three months ended June 30, 2024. The press release is furnished herewith as Exhibit 99.1. We will hold a conference call to discuss our second quarter 2024 financial results on Tuesday, August 6, 2024, at 10:00 a.m. ET. Webcast link: https://event.choruscall.com/mediaframe/webcast.html?webcastid=8mIXrKvK Participant dial-in numbers: Domestic callers: (877) 402-8037 Internati…

Results of Operations and Financial Condition. On May 2, 2024, we issued a press release announcing our results the three months ended March 31, 2024. The press release is furnished herewith as Exhibit 99.1. We will hold a conference call to discuss our first quarter 2024 financial results on Friday, May 3, 2024, at 9:00 a.m. ET. Webcast link: https://event.choruscall.com/mediaframe/webcast.html?webcastid=tHuNeZ2X Participant dial-in numbers: Domestic callers: (877) 402-8037 International cal…

Results of Operations and Financial Condition. On February 21, 2024, we issued a press release announcing our results the three months and year ended December 31, 2023. The press release is furnished herewith as Exhibit 99.1. We will hold a conference call to discuss our fourth quarter and full year 2023 financial results on Thursday, February 22, 2024, at 10:00 a.m. ET. Webcast link: https://event.choruscall.com/mediaframe/webcast.html?webcastid=4YckWj4j Participant dial-in numbers: Domestic…