Westlake Chemical Partners LP (NYSE:WLKP) (the "Partnership") announced that it filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2025 with the Securities and Exchange Commission on March 4, 2026. A copy of this 10-K may be found on the Partnership's website, www.wlkpartners.com, by selecting the "Investor Relations" tab, then "SEC Filings."

Unitholders of the Partnership may receive a hard copy of its Annual Report on Form 10-K, including complete audited financial statements, free of charge. Requests should be submitted in writing to Westlake Chemical Partners LP – 2025 Form 10-K, 2801 Post Oak Blvd., Suite 600, Houston, TX 77056.

About Westlake Chemical Partners LP

Westlake Chemical Partners is a limited partnership formed by Westlake Corporation to operate, acquire and develop ethylene production facilities and other qualified assets. Headquartered in Houston, the Partnership owns a 22.8% interest in Westlake Chemical OpCo LP. Westlake Chemical OpCo LP's assets include three facilities in Calvert City, Kentucky, and Lake Charles, Louisiana which process ethane and propane into ethylene, and an ethylene pipeline. For more information about Westlake Chemical Partners LP, please visit http://www.wlkpartners.com/.

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Contact—(713) 585-2900

Investors—Steve Bender

Media—L. Benjamin Ederington

Westlake Chemical Partners LP Filed Annual Report