OLIN and HUNTSMAN Announce Expiration of Hart-Scott-Rodino Waiting Period for Proposed Merger

Olin Corporation (NYSE: OLN ) and Huntsman Corporation (NYSE: HUN ) today announced that the waiting period under the U.S. Hart-Scott-Rodino Antitrust Improvements Act of 1976 (the "HSR Act") in connection with the pending merger of the two companies has expired. The expiration of the HSR Act waiting period satisfies one of the key closing conditions to the pending merger of equals. As previously announced, on August 25, 2026, shareholders of both companies overwhelmingly approved the transaction. The closing of the transaction remains subject to satisfaction of certain customary closing conditions, including receipt of additional regulatory approvals, which are underway.

About Olin Olin Corporation is a leading vertically integrated global manufacturer and distributor of chemical products and a leading U.S. manufacturer of ammunition. The chemical products produced include chlorine and caustic soda, vinyls, epoxies, chlorinated organics, bleach, hydrogen, and hydrochloric acid. Winchester's principal manufacturing facilities produce and distribute sporting ammunition, law enforcement ammunition, reloading components, small caliber military ammunition and components, industrial cartridges, and clay targets, along with contracted military revenue. Visit www.olin.com for more information on Olin Corporation.

About Huntsman Huntsman Corporation is a publicly traded global manufacturer and marketer of diversified chemical products with 2025 revenues of approximately $6 billion from our continuing operations. Our chemical products number in the thousands and are sold worldwide to manufacturers serving a broad and diverse range of consumer and industrial end markets. We operate more than 55 manufacturing, R&D and operations facilities in approximately 25 countries and employ approximately 6,000 associates within our continuing operations. For more information about Huntsman, please visit the company's website at www.huntsman.com .