$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

Westlake Chemical Corporation (NYSE: WLK) (“Westlake”) announced today the commencement of an underwritten public offering, subject to market and other conditions, of senior unsecured notes (the “Notes”) under its existing shelf registration statement. The timing of pricing and terms of the Notes are subject to market conditions and other factors. Westlake intends to use the net proceeds from the proposed public offering of the Notes to fund a portion of the purchase price of its pending acquisitions (the “Acquisitions”) of 100% of the issued and outstanding equity interests of (i) certain subsidiaries of Boral Industries Inc. engaged in Boral Limited’s North American building products businesses in roofing, siding, trim and shutters, decorative stone and windows for a purchase price of $2.15 billion in cash, subject to certain post-closing adjustments, (ii) Lasco Fittings, Inc. for a purchase price of $252.5 million in cash, subject to certain post-closing adjustments, and (iii) DX

Record quarterly net sales of $2.9 billion Record quarterly net income of $522 million, excluding one-time tax benefits in a prior quarter Record quarterly EBITDA of $932 million Announced pending acquisitions of Boral's North American building products businesses and of LASCO Fittings, Inc., which are expected to close in the second half of 2021 Westlake Chemical Corporation (NYSE: WLK) (the "Company" or "Westlake") today reported record net income, excluding one-time tax benefits, attributable to Westlake for the three months ended June 30, 2021 of $522 million, or $4.04 per diluted share, on record net sales of $2,859 million. Net income in the second quarter of 2021 increased by $507 million from second quarter 2020 net income of $15 million, or $0.11 per share, on net sales of $1,709 million. Income from operations for the second quarter of 2021 was a quarterly record of $720 million, and increased by $684 million from income from operations of $36 million for the second quarter

Record quarterly net income of $25.1 million, an increase of 68% compared to second quarter 2020 Declared quarterly distribution of $0.4714 per unit; 28th consecutive quarterly distribution Westlake Chemical Partners LP (NYSE: WLKP) (the "Partnership") today reported record net income attributable to the Partnership in the second quarter of 2021 of $25.1 million, or $0.71 per limited partner unit, an increase of $10.2 million compared to second quarter 2020 net income attributable to the Partnership of $14.9 million. The increase in net income was a result of higher production, higher earnings on third-party sales as well as a buyer deficiency fee. The buyer deficiency fee of $8.7 million is a result of lower planned production in 2021 attributable to the impacts of the winter storm which occurred in the first quarter and an outage at Westlake Chemical OpCo LP ("OpCo") Petro 1 facility, which occurred on June 25, 2021. Cash flows from operating activities in the second quarter of 2021

Record quarterly net sales of $2.9 billion Record quarterly net income of $522 million, excluding one-time tax benefits in a prior quarter Record quarterly EBITDA of $932 million Announced pending acquisitions of Boral's North American building products businesses and of LASCO Fittings, Inc., which are expected to close in the second half of 2021 Westlake Chemical Corporation (NYSE: WLK) (the "Company" or "Westlake") today reported record net income, excluding one-time tax benefits, attributable to Westlake for the three months ended June 30, 2021 of $522 million, or $4.04 per diluted share, on record net sales of $2,859 million. Net income in the second quarter of 2021 increased by $507 million from second quarter 2020 net income of $15 million, or $0.11 per share, on net sales of $1,709 million. Income from operations for the second quarter of 2021 was a quarterly record of $720 million, and increased by $684 million from income from operations of $36 million for the second quarter

Westlake Chemical Corporation (NYSE: WLK), today announced plans for one of its subsidiaries to acquire the parent company of Dimex LLC, from Grey Mountain Partners, a private equity firm. Based in Marietta, Ohio, Dimex produces a variety of consumer products made from post-industrial-recycled (PIR) polyvinyl chloride (PVC), polyethylene (PE) and thermoplastic elastomer (TPE) materials, and has annualized sales of approximately $100 million. These consumer products include landscape edging; industrial, home and office matting; marine dock edging; and masonry joint controls. The proposed transaction is subject to customary closing conditions, including the expiration or termination of the applicable waiting period under the U.S. Hart-Scott-Rodino Antitrust Improvements Act of 1976, and is expected to close during the second half of 2021. “Westlake’s pending acquisition of Dimex underscores the company’s longstanding commitment to stewardship of the environment and recycling, and to