Third Quarter 2020 Earnings Presentation November 3, 2020 Commitment to Social Responsibility and Advancing Sustainability Westlake's commitment to social responsibility and advancing sustainability is formed by the company's longstanding core values: Health, Safety & Environmental - The vigilant stewardship of the environment and sustainability are of utmost importance and at the forefront of everything we do. Our People - Support, develop and inspire our people to achieve their personal best and treat the ...

Westlake Chemical Corporation (NYSE:WLK) Q2 2020 Earnings Conference Call August 6, 2020 11:00 AM ET Company Participants Jeff Holy – Vice President and Treasurer Albert Chao – President and Chief Executive Officer Steve Bender – Executive Vice President and Chief Financial Officer Conference Call Participants Bhavesh Lodaya – BMO Capital Markets Hassan Ahmed – Alembic Global Kevin McCarthy – Vertical Research David Begleiter – Deutsche Bank Mike Sison – Wells Fargo Alex Yefremov – KeyBanc Jim Sheehan – Tru ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File No. 001-32260 Westlake Chemical Corporation (Exact name of Registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transition Period from to Delaware 76-0346924 (I.R.S. Employ ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION For the Transition Period from to Commission File No. 001-32260 Washington, D.C. 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Westlake Chemical Corporation (Exact name of Registrant as specified in its charter) (State or other jurisdiction of incorporation or or ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transition Period from to Commission File No. 001-32260 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Delaware 76-0346924 Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transition Period from to Commission File No. 001-32260 Westlake Chemical Corporation (Exact name of Registrant as specified in its charter) (State or other jurisdiction of incorporation o ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 2801 Post Oak Boulevard, Suite 600 Houston, Texas 77056 (Address of principal executive offices, including zip code) (713) 960-9111 (Registrant's telephone number, including area code) or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transiti ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 or ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transition Period from to Commission File No. 001-32260 Westlake Chemical Corporation (Exact name of Registrant as specified in its charter) Delaware 76-0346924 (State or other jurisdiction of ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ý ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2018 or ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transition Period from to Commission File No. 001-32260 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorp ...