Westlake Corporation has announced the commencement of a cash tender offer to purchase any and all of its outstanding 3.600% Senior Notes due 2026. The tender offer is being made under the terms and conditions set forth in an Offer to Purchase dated November 4, 2025. The purpose of this tender offer is to extend the maturity of Westlake's outstanding indebtedness.

Westlake intends to fund the purchase of the Notes with the net proceeds from a concurrent senior notes offering. The tender offer is not conditioned on any minimum amount of the Notes being tendered, but it is subject to the successful completion of the concurrent notes offering. The tender offer will expire at 5:00 p.m., New York City time, on November 10, 2025, unless extended or terminated by Westlake.

The settlement date for the tendered Notes is expected to be on or about November 12, 2025.