$0.2975 cents per share dividend declared payable on September 8, 2021 The Board of Directors of Westlake Chemical Corporation (NYSE:WLK) declared today a regular dividend distribution of $0.2975 per share for the second quarter of 2021, an increase of 10.2% from the $0.2700 per share in the first quarter of 2021. This dividend will be payable on September 8, 2021, to stockholders of record on August 24, 2021. This is the 68th successive quarterly dividend that Westlake has declared since completing its initial public offering in August 2004. About Westlake Westlake is a global manufacturer and supplier of materials and innovative products that enhance life every day. Headquartered in Houston, we provide the building blocks for vital solutions — from building products and infrastructure materials, to packaging and healthcare products, to automotive and consumer goods. For more information, visit the company's web site at www.westlake.com . View source version on businesswire.com:

Westlake Chemical Corporation (NYSE: WLK) (“Westlake”) announced today that it has priced its previously announced underwritten public offering of $300,000,000 aggregate principal amount of senior unsecured notes due 2024 (the “2024 Notes”), $350,000,000 aggregate principal amount of senior unsecured notes due 2041 (the “2041 Notes”), $600,000,000 aggregate principal amount of senior unsecured notes due 2051 (the “2051 Notes”) and $450,000,000 aggregate principal amount of senior unsecured notes due 2061 (the “2061 Notes” and, together with the 2024 notes, the 2041 Notes and the 2051 Notes, the “Notes”) under its existing shelf registration statement. The 2024 Notes will bear interest at a rate of 0.875% per annum and will mature on August 15, 2024. The 2041 Notes will bear interest at a rate of 2.875% per annum and will mature on August 15, 2041. The 2051 Notes will bear interest at a rate of 3.125% per annum and will mature on August 15, 2051. The 2061 Notes will bear interest at a