WLK / Westlake Corporation - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Westlake Corporation
US ˙ NYSE ˙ US9604131022

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LEI GOXNEVUM0LL78B1OS344
CIK 1262823
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Westlake Corporation
SEC Filings (Chronological Order)
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August 26, 2025 EX-99.1

WESTLAKE ANNOUNCES ACQUISITION OF ACI COMPOUNDING SOLUTIONS BUSINESS Deal Brings Expansion for Westlake’s Housing & Infrastructure Products Segment

Exhibit 99.1 WESTLAKE ANNOUNCES ACQUISITION OF ACI COMPOUNDING SOLUTIONS BUSINESS Deal Brings Expansion for Westlake’s Housing & Infrastructure Products Segment HOUSTON, August 26, 2025 — Westlake Corporation (NYSE: WLK) announced today that it has entered into an agreement to acquire the global compounding solutions businesses of the ACI/Perplastic Group (collectively, "ACI"). ACI is a Portugal-b

August 26, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 26, 2025 Westlake Corporat

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 26, 2025 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission Fi

August 6, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

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, 2025 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 Corporation (Exa

August 5, 2025 EX-99.2

Investor Presentation.

ex99220250630wlkearning

August 5, 2025 EX-99.1

WESTLAKE CORPORATION

EXHIBIT 99.1 WESTLAKE CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Corporation Reports Second Quarter 2025 Results HOUSTON-(BUSINESS WIRE)-Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced second quarter 2025 results. SUMMARY FINANCIAL HIGHLIGHTS (in millions of dollars, except per share data and percentages) Three Mon

August 5, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 5, 2025 Westlake Corporati

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 5, 2025 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission Fil

June 17, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): June 17, 2025 Westlake Corporatio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): June 17, 2025 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File

May 23, 2025 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of in

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File Number) (I.R.S. Employer Identification No.) 2801 Post Oak Boulevard, Suite 600 Houston, Texas 77056 (Address of princip

May 12, 2025 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 8, 2025 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File N

May 2, 2025 EX-99.2

1 Earnings Presentation 1Q 2025 2 First Quarter 2025 Highlights Operational Milestones $2.5 billion cash position provides significant optionality • 1Q’25 PEM EBITDA impacted by $100 million of YoY higher feedstock and energy costs and $80 million fr

1 Earnings Presentation 1Q 2025 2 First Quarter 2025 Highlights Operational Milestones $2.

May 2, 2025 EX-99.1

WESTLAKE CORPORATION

EXHIBIT 99.1 WESTLAKE CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Corporation Reports First Quarter 2025 Results HOUSTON-(BUSINESS WIRE)-Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced first quarter 2025 results. SUMMARY FINANCIAL HIGHLIGHTS (in millions of dollars, except per share data and percentages) Three Month

May 2, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 2, 2025 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File N

May 2, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

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 March 31, 2025 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 Corporation (Ex

April 16, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): April 11, 2025 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission Fil

March 28, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

March 28, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

DEFA14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

March 4, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 28, 2025 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission

February 25, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2024 ☐ TRANSITION REPORT PURSUANT TO SECTI

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2024 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 Co

February 25, 2025 EX-19

Westlake Corporation Insider Trading Policy.

EXHIBIT 19 WESTLAKE CORPORATION Insider Trading Policy Revised and effective as of May 11, 2023 I.

February 25, 2025 EX-21

Subsidiaries of Westlake.

EXHIBIT 21 SUBSIDIARIES OF WESTLAKE CORPORATION * Name of Subsidiary State or Other Jurisdiction of Incorporation or Organization Names Doing Business Eagle Spinco Inc.

February 24, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 24, 2025 Westlake Corpor

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 24, 2025 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission

February 24, 2025 EX-99.2

1 Earnings Presentation 4Q and Full Year 2024 2 Fourth Quarter and Full Year 2024 Highlights Fifth consecutive quarter of YoY sales volume growth with momentum into 2025 • Record Housing and Infrastructure Products (HIP) 2024 income from operations o

1 Earnings Presentation 4Q and Full Year 2024 2 Fourth Quarter and Full Year 2024 Highlights Fifth consecutive quarter of YoY sales volume growth with momentum into 2025 • Record Housing and Infrastructure Products (HIP) 2024 income from operations of $807 million driven by our position as a key supplier to faster-growing national homebuilders • Record HIP 2024 EBITDA of $1.

February 24, 2025 EX-99.1

WESTLAKE CORPORATION

EXHIBIT 99.1 WESTLAKE CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Corporation Reports Fourth Quarter and Full Year 2024 Results •Record Housing and Infrastructure Products (HIP) annual income from operations of $807 million and EBITDA of $1.1 billion •Fifth consecutive quarter of year-over-year growth in company-wide sales volume HOUSTON-(BUSINES

December 11, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): December 10, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission

December 11, 2024 EX-99.1

Westlake Corporation Appoints New Director to its Board

Exhibit 99.1 Westlake Corporation Appoints New Director to its Board HOUSTON, December 10, 2024 – Westlake Corporation (NYSE: WLK) announced that Mr. Roger A. Cregg has been appointed to the company’s board of directors. Mr. Cregg succeeds Mr. Marius A. Haas who, as previously disclosed, informed the board that he intended to retire from the board effective upon the appointment of his successor. M

November 6, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

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, 2024 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 Corporation

November 5, 2024 EX-99.1

WESTLAKE CORPORATION

EXHIBIT 99.1 WESTLAKE CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Corporation Reports Third Quarter 2024 Results HOUSTON-(BUSINESS WIRE)-Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced third quarter 2024 results. SUMMARY FINANCIAL HIGHLIGHTS (in millions of dollars, except per share data and percentages) Three Month

November 5, 2024 EX-99.2

1 Earnings Presentation 3Q 2024 2 Third Quarter 2024 Highlights 3Q 2024 Financial Results(1) Improving underlying trends despite impacts from outages and weather • Sales volume increased 3% YoY driven by improving chlorine and caustic soda demand • A

1 Earnings Presentation 3Q 2024 2 Third Quarter 2024 Highlights 3Q 2024 Financial Results(1) Improving underlying trends despite impacts from outages and weather • Sales volume increased 3% YoY driven by improving chlorine and caustic soda demand • Average sales price increased 1% QoQ with improvement in each segment • Performance and Essential Materials (PEM) EBITDA impacted by ~$120 million from

November 5, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 5, 2024 Westlake Corpora

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 5, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission F

August 22, 2024 CORRESP

August 22, 2024

CORRESP August 22, 2024 VIA EDGAR United States Securities & Exchange Commission Division of Corporation Finance 100 F Street, N.

August 12, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 8, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission Fil

August 9, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

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, 2024 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 Corporation (Exa

August 6, 2024 EX-99.2

1 Earnings Presentation 2Q 2024 2 Second Quarter 2024 Highlights 2Q 2024 Financial Results Record HIP segment earnings with improving PEM segment profitability • Jean-Marc Gilson named President and CEO; Albert Chao appointed Executive Chairman • Hou

ex99220240630earningspr 1 Earnings Presentation 2Q 2024 2 Second Quarter 2024 Highlights 2Q 2024 Financial Results Record HIP segment earnings with improving PEM segment profitability • Jean-Marc Gilson named President and CEO; Albert Chao appointed Executive Chairman • Housing and Infrastructure Products (HIP) reported records in income from operations of $266 million, EBITDA of $336 million and

August 6, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 6, 2024 Westlake Corporati

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 6, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission Fil

August 6, 2024 EX-99.1

WESTLAKE CORPORATION

EXHIBIT 99.1 WESTLAKE CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Corporation Reports Second Quarter 2024 Results •Record Housing and Infrastructure Products (HIP) segment income from operations of $266 million •Record HIP segment EBITDA of $336 million •Sequential increases in Performance and Essential Materials (PEM) segment earnings and margin

July 29, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): July 29, 2024 Westlake Corporatio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): July 29, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File

July 15, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): July 15, 2024 Westlake Corporatio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): July 15, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File

July 15, 2024 EX-99.1

Westlake Implements Succession Plan Jean-Marc Gilson, Experienced Chemicals Industry Executive, Appointed President and CEO Albert Chao and James Chao to Remain Actively Engaged as Executive Chairman and Senior Chairman of the Board, Respectively

Exhibit 99.1 Westlake Implements Succession Plan Jean-Marc Gilson, Experienced Chemicals Industry Executive, Appointed President and CEO Albert Chao and James Chao to Remain Actively Engaged as Executive Chairman and Senior Chairman of the Board, Respectively HOUSTON, July 15, 2024 – Westlake Corporation (NYSE: WLK) (the “Company” or “Westlake”) today announced that Jean-Marc Gilson, who most rece

July 1, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): July 1, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File

June 13, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): June 13, 2024 Westlake Corporatio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): June 13, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File

June 13, 2024 EX-99.1

Welcome: HIP Teach-In John Zoeller Vice President and Treasurer June 13, 2024 EVERY PIECE MATTERS Agenda 2 Welcome John Zoeller Vice President and Treasurer Every Piece Matters Albert Chao President and Chief Executive Officer Leading Positions Acros

exhibit991 Welcome: HIP Teach-In John Zoeller Vice President and Treasurer June 13, 2024 EVERY PIECE MATTERS Agenda 2 Welcome John Zoeller Vice President and Treasurer Every Piece Matters Albert Chao President and Chief Executive Officer Leading Positions Across Diverse End Markets Bob Buesinger Executive Vice President – Housing & Infrastructure Products, IT & Digital Products and Solutions for W

May 29, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 22, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File

May 22, 2024 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of in

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File Number) (I.R.S. Employer Identification No.) 2801 Post Oak Boulevard, Suite 600 Houston, Texas 77056 (Address of princip

May 13, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 9, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File N

May 2, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

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 March 31, 2024 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 Corporation (Ex

May 1, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 1, 2024 Westlake Corporation

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 1, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File N

May 1, 2024 EX-99.2

1 Earnings Presentation 1Q 2024 2 First Quarter 2024 Highlights (1) Excludes “Identified Items” consisting of a $475 million non-cash impairment charge and a $150 million ($115 million after tax) charge to fully resolve certain claims (2) Reconciliat

ex99220240331earningspr 1 Earnings Presentation 1Q 2024 2 First Quarter 2024 Highlights (1) Excludes “Identified Items” consisting of a $475 million non-cash impairment charge and a $150 million ($115 million after tax) charge to fully resolve certain claims (2) Reconciliation of Net Income and Net Income Per Share excl.

May 1, 2024 EX-99.1

WESTLAKE CORPORATION

EXHIBIT 99.1 WESTLAKE CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Corporation Reports First Quarter 2024 Results •Record first quarter Housing and Infrastructure Products (HIP) income from operations of $210 million with a 20% operating income margin •HIP EBITDA of $264 million rose 29% year-over-year with a record first quarter EBITDA margin of

April 25, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): April 25, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission Fil

April 11, 2024 PX14A6G

Westlake Corp. (WLK) Vote Yes: Proposal #3 Shareholder Proposal on Single-Use Plastics Annual Meeting: May 9, 2024

Main Post Office, P.O. Box 751 www.asyousow.org Berkeley, CA 94704 BUILDING A SAFE, JUST, AND SUSTAINABLE WORLD SINCE 1992 Notice of Exempt Solicitation Pursuant to Rule 14a-103 Name of the Registrant: Westlake Corp. Name of persons relying on exemption: As You Sow® Address of persons relying on exemption: Main Post Office, P.O. Box 751, Berkeley, CA 94704 Written materials are submitted pursuant

April 3, 2024 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): April 3, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File

March 29, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

March 29, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒        Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by

February 22, 2024 EX-10.19

Form of Stock Option Award Letter for 2024 Executive Officer Awards.

Exhibit 10.19 %%OPTIONDATE,'Month DD, YYYY'%-% %%FIRSTNAMEMIDDLENAMELASTNAME%-% %%TITLE1%-% Re: WESTLAKE CORPORATION NONQUALIFIED STOCK OPTION AWARD Dear %%FIRSTNAME%-%: Westlake Corporation (the “Company”) is pleased to notify you that, in consideration of your past and/or continued employment with or service to the Company and other good and valuable consideration and subject to your full compli

February 22, 2024 EX-97

Westlake Corporation Policy for Recovery of Erroneously Awarded Compensation, effective as of October 2, 2023

Exhibit 97 Westlake Corporation (the “Company”) has adopted this Policy for Recovery of Erroneously Awarded Compensation (the “Policy”), effective as of October 2, 2023 (the “Effective Date”).

February 22, 2024 EX-21

Subsidiaries of Westlake.

EXHIBIT 21 SUBSIDIARIES OF WESTLAKE CORPORATION * Name of Subsidiary State or Other Jurisdiction of Incorporation or Organization Names Doing Business Eagle Spinco Inc.

February 22, 2024 EX-4.1

Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

EXHIBIT 4.1 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Common Stock The following is a summary of Westlake Corporation’s (“Westlake,” “we,” “us” and “our”) common stock, par value $0.01 per share, which is listed on the New York Stock Exchange under the symbol “WLK.” This summary does not purport to be complete and is subject

February 22, 2024 EX-3.1

Restated Certificate of Incorporation of Westlake as filed with the Delaware Secretary of State on February 20, 2024 (incorporated by reference to Exhibit 3.1 to Westlake's Annual Report on Form 10-K for the year ended December 31, 2023 filed on February 22, 2024, File No. 001-32260).

Exhibit 3.1 RESTATED CERTIFICATE OF INCORPORATION OF WESTLAKE CORPORATION The present name of the corporation is Westlake Corporation. Westlake Corporation was incorporated under the name “Westlake Vinyl Corporation” by the filing of its original certificate of incorporation with the Secretary of State of the State of Delaware on September 3, 1991. This Restated Certificate of Incorporation of Wes

February 22, 2024 EX-10.20

Form of Performance Stock Unit Award Letter for 2024 Executive Officer Awards.

Exhibit 10.20 %%OPTIONDATE,'Month DD, YYYY'%-% %%FIRSTNAMEMIDDLENAMELASTNAME%-% %%TITLE1%-% Re: WESTLAKE CORPORATION PERFORMANCE STOCK UNIT AWARD Dear %%FIRSTNAME%-%: Westlake Corporation (the “Company”) is pleased to notify you that, in consideration of your past and/or continued employment with or service to the Company and other good and valuable consideration and subject to your full complianc

February 22, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTI

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2023 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 Co

February 20, 2024 EX-99.2

1 Earnings Presentation 4Q 2023 2 Fourth Quarter 2023 Highlights (1) Excludes “Identified Items” consisting of a $475 million non-cash impairment charge and a $150 million charge to fully resolve certain claims (2) Reconciliation of Net Income and Ne

1 Earnings Presentation 4Q 2023 2 Fourth Quarter 2023 Highlights (1) Excludes “Identified Items” consisting of a $475 million non-cash impairment charge and a $150 million charge to fully resolve certain claims (2) Reconciliation of Net Income and Net Income Per Share excl.

February 20, 2024 EX-99.1

WESTLAKE CORPORATION

EXHIBIT 99.1 WESTLAKE CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Corporation Reports Fourth Quarter and Full Year 2023 Results •Record Housing and Infrastructure Products (HIP) annual income from operations of $710 million with a 17% income from operations margin and a 23% EBITDA margin •Generated $2.3 billion of net cash from operating activiti

February 20, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 20, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission

February 14, 2024 SC 13G/A

WLK / Westlake Corporation / TTWF LP Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 19)* WESTLAKE CORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 960413102 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this S

February 6, 2024 8-K

Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 6, 2024 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission F

November 2, 2023 EX-99.1

WESTLAKE CORPORATION

EXHIBIT 99.1 WESTLAKE CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Corporation Reports Third Quarter 2023 Results •Record Housing and Infrastructure Products segment income from operations of $256 million •Record Housing and Infrastructure Products segment EBITDA of $327 million •Net cash provided by operating activities of $696 million and free c

November 2, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

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, 2023 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 Corporation

November 2, 2023 EX-99.2

1 Earnings Presentation 3Q 2023 2 Third Quarter 2023 Highlights (1) Reconciliation of EBITDA to Net Income, Income from Operations and Net Cash Provided by Operating Activities can be found on page 11 (2) Reconciliation of Free Cash Flow to Net Cash

1 Earnings Presentation 3Q 2023 2 Third Quarter 2023 Highlights (1) Reconciliation of EBITDA to Net Income, Income from Operations and Net Cash Provided by Operating Activities can be found on page 11 (2) Reconciliation of Free Cash Flow to Net Cash Provided by Operating Activities can be found on page 13 (3) EBITDA margin is calculated by dividing EBITDA by Net Sales 3Q 2023 Financial Results Record Housing and Infrastructure Products (HIP) segment earnings provide stability • Sales volume increased 4% vs.

November 2, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 2, 2023 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission F

August 3, 2023 EX-99.1

WESTLAKE CORPORATION

EXHIBIT 99.1 WESTLAKE CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Corporation Reports Second Quarter 2023 Results •Housing and Infrastructure Products segment provided earnings stability •Cash from operations of $555 million and free cash flow of $315 million HOUSTON-(BUSINESS WIRE)-Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") t

August 3, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 3, 2023 Westlake Corporati

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 3, 2023 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission Fil

August 3, 2023 EX-10.2

Westlake Corporation Amended and Restated Annual Incentive Plan

Exhibit 10.2 WESTLAKE CORPORATION ANNUAL INCENTIVE PLAN As Amended and Restated as of May 11, 2023 1.Objective. The Westlake Corporation Annual Incentive Plan (the “Plan”) is designed to reward and recognize selected employees of Westlake Corporation (the “Company”) and its Subsidiaries for their contributions toward building growth and adding to the value of the Company. These objectives are to b

August 3, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

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, 2023 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 Corporation (Exa

August 3, 2023 EX-99.2

2Q 2023 Earnings Presentation 2 Westlake Second Quarter 2023 Highlights  Net sales of $3.3 billion, net income of $297 million and EBITDA(1) of $690 million  Elevated level of unplanned outages impacted operating income and EBITDA by ~$50 million 

ex99220230630wlkearning 2Q 2023 Earnings Presentation 2 Westlake Second Quarter 2023 Highlights  Net sales of $3.

August 3, 2023 EX-10.3

etter for 2023 Executive Officer Award

Exhibit 10.3 %%OPTIONDATE,'Month DD, YYYY'%-% %%FIRSTNAMEMIDDLENAMELASTNAME%-% %%TITLE1%-% Re: WESTLAKE CORPORATION RESTRICTED STOCK UNIT AWARD Dear %%FIRSTNAME%-%, Westlake Corporation (the “Company”) is pleased to notify you that, in consideration of your past and/or continued employment with or service to the Company and other good and valuable consideration and subject to your full compliance

May 31, 2023 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of in

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File Number) (I.R.S. Employer Identification No.) 2801 Post Oak Boulevard, Suite 600 Houston, Texas 77056 (Address of princip

May 16, 2023 EX-3.1

Certificate of Amendment to the Amended and Restated Certificate of Incorporation of Westlake as filed with the Delaware Secretary of State on May 11, 2023 (incorporated by reference to Westlake's Current Report on Form 8-K, filed on May 16, 2023, File No. 001-32260).

EX-3.1 Exhibit 3.1 CERTIFICATE OF AMENDMENT OF AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF WESTLAKE CORPORATION Westlake Corporation, a Delaware corporation (the “Corporation”), certifies as follows: 1. Article SEVENTH of the Amended and Restated Certificate of Incorporation of the Corporation is hereby amended to read in its entirety as follows: SEVENTH: No director or officer of the Cor

May 16, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 11, 2023 Westlake Corporation

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 11, 2023 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File

May 11, 2023 EX-4.7

Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934.

EX-4.7 EXHIBIT 4.7 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Common Stock The following is a summary of Westlake Corporation’s (“Westlake,” “we,” “us” and “our”) common stock, par value $0.01 per share, which is listed on the New York Stock Exchange under the symbol “WLK.” This summary does not purport to be complete and is

May 11, 2023 EX-FILING FEES

Filing Fee Table.

Exhibit 107 CALCULATION OF FILING FEE TABLE Form S-8 (Form Type) Westlake Corporation (Exact Name of Registrant as Specified in its Charter) Table 1 – Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common Stock, par value $0.

May 11, 2023 S-8

As filed with the Securities and Exchange Commission on May 11, 2023

S-8 As filed with the Securities and Exchange Commission on May 11, 2023 Registration No.

May 4, 2023 10-Q

Form 10-Q

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 March 31, 2023 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 Corporation (Ex

May 4, 2023 EX-99.1

WESTLAKE CORPORATION

EXHIBIT 99.1 WESTLAKE CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Corporation Reports First Quarter 2023 Results •Net income of $394 million increased 70% from fourth quarter 2022 HOUSTON-(BUSINESS WIRE)-Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced first quarter 2023 results. SUMMARY FINANCIAL HIGHLIGHTS ($ in mi

May 4, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 4, 2023 Westlake Corporation

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 4, 2023 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File N

May 4, 2023 EX-99.2

1Q 2023 Earnings Presentation 2 Westlake First Quarter 2023 Highlights  Solid financial results reflecting sequential improvement against an uncertain macroeconomic backdrop:  Net sales of $3.4 billion, an increase of 2% vs. fourth quarter 2022 net

ex99220230331wlkearning 1Q 2023 Earnings Presentation 2 Westlake First Quarter 2023 Highlights  Solid financial results reflecting sequential improvement against an uncertain macroeconomic backdrop:  Net sales of $3.

April 20, 2023 PX14A6G

Westlake Corp. (WLK) Vote Yes: Item # 8 Shareholder Proposal on Single-Use Plastics Annual Meeting: May 11, 2023

Main Post Office, P.O. Box 751 www.asyousow.org Berkeley, CA 94704 BUILDING A SAFE, JUST, AND SUSTAINABLE WORLD SINCE 1992 Notice of Exempt Solicitation Pursuant to Rule 14a-103 Name of the Registrant: Westlake Corp. (WLK) Name of persons relying on exemption: As You Sow Address of persons relying on exemption: Main Post Office, P.O. Box 7451, Berkeley, CA 94704 Written materials are submitted pur

April 5, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): April 3, 2023 Westlake Corporatio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): April 3, 2023 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File

March 31, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

March 31, 2023 DEF 14A

Westlake Corporation Omnibus Incentive Plan (As Amended and Restated Effective May 11, 2023) (incorporated by reference to Appendix B of Westlake’s Definitive Proxy Statement on Schedule 14A filed on March 31, 2023, File No. 001-32260).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

March 20, 2023 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

February 22, 2023 10-K

Form 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2022 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 Co

February 22, 2023 EX-21

Subsidiaries of Westlake.

EXHIBIT 21 SUBSIDIARIES OF WESTLAKE CORPORATION * Name of Subsidiary State or Other Jurisdiction of Incorporation or Organization Names Doing Business Eagle Spinco Inc.

February 21, 2023 EX-99.1

WESTLAKE CORPORATION

EXHIBIT 99.1 WESTLAKE CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Corporation Reports Record Full-Year 2022 Results HOUSTON-(BUSINESS WIRE)-Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced fourth quarter and record full-year 2022 results. SUMMARY FINANCIAL HIGHLIGHTS ($ in millions except per share data) Three Months

February 21, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 16, 2023 Westlake Corpor

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 16, 2023 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission

February 21, 2023 EX-99.2

4Q 2022 Earnings Presentation 2 Westlake Fourth Quarter 2022 Highlights ▪ Compared to the prior-year period, fourth quarter financial results were impacted by lower sales volume1 and selling prices due to customer destocking, China lockdowns, lacklus

ex99220221231wlkearning 4Q 2022 Earnings Presentation 2 Westlake Fourth Quarter 2022 Highlights ▪ Compared to the prior-year period, fourth quarter financial results were impacted by lower sales volume1 and selling prices due to customer destocking, China lockdowns, lackluster European demand and rising interest rates: ▪ Net sales of $3.

February 21, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 21, 2023 Westlake Corpor

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 21, 2023 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission

January 18, 2023 SC 13G/A

WLK / Westlake Chemical Corporation / TTWF LP Passive Investment

SC 13G/A 1 ff167738413ga-westlake.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 18)* WESTLAKE CORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 960413102 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to desig

November 3, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 3, 2022 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission F

November 3, 2022 EX-99.1

WESTLAKE CORPORATION

EX-99.1 2 ex99120220930earningsrele.htm EX-99.1 EXHIBIT 99.1 WESTLAKE CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Corporation Reports Third Quarter 2022 Results HOUSTON-(BUSINESS WIRE)-Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced third quarter 2022 results. SUMMARY FINANCIAL HIGHLIGHTS ($ in millions except per s

November 3, 2022 EX-99.2

Q3 2022 Earnings Presentation 2 Westlake Third Quarter 2022 Highlights  Solid financial results given the challenging macroeconomic backdrop and industry conditions:  Net sales of $4.0 billion, an increase of 29% vs. third quarter 2021 net sales 

Q3 2022 Earnings Presentation 2 Westlake Third Quarter 2022 Highlights ? Solid financial results given the challenging macroeconomic backdrop and industry conditions: ? Net sales of $4.

November 3, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

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, 2022 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 Corporation

November 3, 2022 EX-FILING FEES

Filing Fee Table.

Exhibit 107 Calculation of Filing Fee Tables Form S-3ASR (Form Type) Westlake Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title (1) Fee Calculation or Carry Forward Rule (2) Amount Registered(3) Proposed Maximum Offering Price Per Unit (3) Maximum Aggregate Offering Price (3) Fee Rate (2) Amo

November 3, 2022 EX-25.1

Form T-1 Statement of Eligibility of The Bank of New York Mellon Trust Company, N.A., as Trustee, with respect to the Indenture, dated as of January 1, 2006.

Exhibit 25.1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (Exact name of trustee as specified in its charter) 95-

November 3, 2022 S-3ASR

As filed with the Securities and Exchange Commission on November 3, 2022

Table of Contents As filed with the Securities and Exchange Commission on November 3, 2022 Registration No.

August 15, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 12, 2022 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission Fi

August 15, 2022 EX-99.1

Westlake Announces $500 Million Expansion of Existing Share Repurchase Program and 20% Increase in Quarterly Dividend

Exhibit 99.1 Westlake Announces $500 Million Expansion of Existing Share Repurchase Program and 20% Increase in Quarterly Dividend HOUSTON, August 12, 2022 ? The Board of Directors of Westlake Corporation (NYSE: WLK) today authorized the company to repurchase an additional $500 million of shares of its common stock under its existing share repurchase program. As of August 12, 2022, approximately 9

August 3, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

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, 2022 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 Corporation (Exa

August 2, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 2, 2022 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission Fil

August 2, 2022 EX-99.2

Q2 2022 Earnings Presentation 2 Westlake Delivers Record Quarter  Record quarterly results in 2Q 2022:  Record quarterly net sales of $4.5 billion, an increase of 57% vs. second quarter 2021 net sales  Record quarterly net income of $858 million,

Q2 2022 Earnings Presentation 2 Westlake Delivers Record Quarter ? Record quarterly results in 2Q 2022: ? Record quarterly net sales of $4.

August 2, 2022 EX-99.1

WESTLAKE CORPORATION

EXHIBIT 99.1 WESTLAKE CORPORATION Contact?(713) 960-9111 Investors?Steve Bender Media?L. Benjamin Ederington Westlake Corporation Reports Record Second Quarter 2022 Results ?Record quarterly net sales of $4.5 billion, an increase of 57% vs. second quarter 2021 net sales ?Record quarterly net income of $858 million, an increase of 64% vs. second quarter 2021 net income ?Record quarterly EBITDA of $

June 9, 2022 EX-10.1

Credit Agreement dated as of June 9, 2022, by and among Westlake Corporation, the lenders from time to time party thereto, the issuing banks party thereto and JPMorgan Chase Bank, National Association, as Administrative Agent, relating to a $1.5 billion senior unsecured revolving credit facility (incorporated by reference to Exhibit 10.1 to Westlake's Current Report on Form 8-K, filed on June 09, 2022, File No. 001-32260).

Exhibit 10.1 EXECUTION VERSION CREDIT AGREEMENT dated as of June 9, 2022 among WESTLAKE CORPORATION, The Lenders Party Hereto The Issuing Banks Party Hereto and JPMORGAN CHASE BANK, N.A., as Administrative Agent. JPMORGAN CHASE BANK, N.A., BofA SECURITIES, INC. and WELLS FARGO SECURITIES, LLC, as Joint Bookrunners and Joint Lead Arrangers, BofA SECURITIES, INC. and WELLS FARGO BANK, NATIONAL ASSOC

June 9, 2022 8-K

Entry into a Material Definitive Agreement, Termination of a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): June 9, 2022 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File

May 16, 2022 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of in

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File Number) (I.R.S. Employer Identification No.) 2801 Post Oak Boulevard, Suite 600 Houston, Texas 77056 (Address of princip

May 13, 2022 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 12, 2022 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File

May 4, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

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 March 31, 2022 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 Corporation (Ex

May 3, 2022 EX-99.1

WESTLAKE CORPORATION

EXHIBIT 99.1 WESTLAKE CORPORATION Contact?(713) 960-9111 Investors?Steve Bender Media?L. Benjamin Ederington Westlake Corporation Reports Record First Quarter 2022 Results ?Record quarterly net sales of $4.1 billion, an increase of 72% vs. first quarter 2021 net sales ?Record quarterly net income of $756 million, an increase of 212% vs. first quarter 2021 net income ?Record quarterly EBITDA of $1.

May 3, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 3, 2022 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File N

May 3, 2022 EX-99.2

Q1 2022 Earnings Presentation EXHIBIT 99.2 2 Westlake Delivers Record Quarter  Record results in 1Q 2022  Record quarterly net sales of $4.1 billion, an increase of 72% vs. first quarter 2021 net sales  Record quarterly net income of $756 million,

Q1 2022 Earnings Presentation EXHIBIT 99.2 2 Westlake Delivers Record Quarter ? Record results in 1Q 2022 ? Record quarterly net sales of $4.1 billion, an increase of 72% vs. first quarter 2021 net sales ? Record quarterly net income of $756 million, an increase of 212% vs. first quarter 2021 net income ? Record quarterly EBITDA of $1.3 billion, an increase of 135% vs. first quarter 2021 EBITDA ?

April 1, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

DEF 14A 1 d231363ddef14a.htm DEF 14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as p

April 1, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

February 23, 2022 EX-21

Subsidiaries of Westlake.

EXHIBIT 21 SUBSIDIARIES OF WESTLAKE CORPORATION * Name of Subsidiary State or Other Jurisdiction of Incorporation or Organization Names Doing Business Axiall Canada, Inc.

February 23, 2022 EX-10.21

Stock Purchase Agreement dated, November 24, 2021, between Hexion Inc. Westlake Olefins LLC and, solely for purposes of Section 13.13, Westlake

EXHIBIT 10.21 EXECUTION VERSION STOCK PURCHASE AGREEMENT dated as of November 24, 2021 between HEXION INC. WESTLAKE OLEFINS LLC AND, SOLELY FOR PURPOSES OF SECTION 13.13, WESTLAKE CHEMICAL CORPORATION relating to the purchase and sale of 100% of the stock of HEXION COATINGS AND COMPOSITES (US) INC. TABLE OF CONTENTS Page Article 1 Definitions Section 1.01. Definitions 1 Section 1.02. Other Definit

February 23, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2021 ☐ TRANSITION REPORT PURSUANT TO SECTI

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2021 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 Co

February 22, 2022 EX-99.2

Westlake Corporation Fourth Quarter 2021 Earnings Presentation February 22, 2022 Westlake Corporation 2021 Highlights  Record fourth quarter and full-year 2021 results for sales, net income and EBITDA  Re-segmentation of business to provide greater

Westlake Corporation Fourth Quarter 2021 Earnings Presentation February 22, 2022 Westlake Corporation 2021 Highlights ? Record fourth quarter and full-year 2021 results for sales, net income and EBITDA ? Re-segmentation of business to provide greater clarity and enhanced reporting of all businesses ? Housing and Infrastructure Products segment EBITDA of $534 million for 2021 ? Performance and Essential Materials segment EBITDA of $3,247 million for 2021 ? Announce $3.

February 22, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 22, 2022 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission

February 22, 2022 EX-99.1

WESTLAKE CORPORATION

EXHIBIT 99.1 WESTLAKE CORPORATION Contact?(713) 960-9111 Investors?Steve Bender Media? L. Benjamin Ederington Westlake Corporation Reports Record Fourth Quarter and Full Year 2021 Results ?Record annual net sales of $11.8 billion, an increase of 57% vs. 2020 net sales ?Record annual net income of $2.0 billion, an increase of 511% vs. 2020 net income ?Record annual EBITDA of $3.7 billion, an increa

February 18, 2022 EX-3.2

Amended and Restated Bylaws of Westlake (incorporated by reference to Westlake’s Current Report on Form 8-K, filed on February 18, 2022, File No. 001-32260).

Exhibit 3.2 SECOND AMENDED AND RESTATED BYLAWS OF WESTLAKE CORPORATION Adopted and Amended by the Board of Directors effective as of February 18, 2022 ARTICLE I Capital Stock Section 1. Share Ownership . Shares of the capital stock of the Corporation shall be represented by certificates; provided, however, that the Board of Directors of the Corporation may provide by resolution or resolutions that

February 18, 2022 EX-99.1

Westlake Chemical Corporation to Change Name to Westlake Corporation

Exhibit 99.1 Westlake Chemical Corporation to Change Name to Westlake Corporation ? New name reflects the Company?s more diversified business portfolio stemming from recent acquisitions and overall organic and strategic growth ? Westlake is now organized under one unified brand with two segments ? Housing & Infrastructure Products and Performance & Essential Materials ? Westlake recently concluded

February 18, 2022 8-K

Regulation FD Disclosure, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 18, 2022 Westlake Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission

February 18, 2022 EX-3.1

Certificate of Amendment of Amended and Restated Certificate of Incorporation of the Company.

Exhibit 3.1 CERTIFICATE OF AMENDMENT OF AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF WESTLAKE CHEMICAL CORPORATION Westlake Chemical Corporation, a Delaware corporation (the ?Corporation?), certifies as follows: 1. Article FIRST of the Amended and Restated Certificate of Incorporation of the Corporation is hereby amended to read in its entirety as follows: FIRST: The name of the corporatio

February 1, 2022 EX-99.1

Westlake Completes Acquisition of Epoxy Business

Exhibit 99.1 Westlake Completes Acquisition of Epoxy Business ? Company completes acquisition of Hexion Inc.?s global epoxy business for ~$1.2 billion ? Leading global supplier of coatings and composites used in wind turbine blades and automotive structural components to expand Westlake?s chemical materials portfolio ? Epoxy addition reaffirms Westlake commitment to sustainability with materials t

February 1, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 1, 2022 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Com

January 21, 2022 SC 13G/A

WLK / Westlake Chemical Corporation / TTWF LP Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 17)* WESTLAKE CHEMICAL CORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 960413102 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whi

November 24, 2021 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 24, 2021 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Co

November 24, 2021 EX-99.2

Westlake’s Acquisition of Hexion Epoxy Adds A New Growth Platform With Sustainable Applications Epoxies expand Westlake’s integrated materials business into attractive global high-growth, innovative, and sustainably oriented end-use products includin

Westlake Chemical Corporation Westlake Adds to Downstream Integration and Sustainable Products Through Acquisition of Hexion?s Epoxy Business November 24, 2021 Exhibit 99.

November 24, 2021 EX-99.1

Westlake to Acquire Hexion’s Global Epoxy Business Leading global supplier of coatings and composites used in wind turbine blades and automotive structural components to expand Westlake’s chemicals portfolio

Exhibit 99.1 Westlake to Acquire Hexion?s Global Epoxy Business Leading global supplier of coatings and composites used in wind turbine blades and automotive structural components to expand Westlake?s chemicals portfolio HOUSTON, November 24, 2021 ? Westlake Chemical Corporation (NYSE: WLK), today announced that it has entered into a definitive agreement with Hexion Inc. to acquire Hexion?s global

November 3, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

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, 2021 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 Co

November 2, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 2, 2021 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Com

November 2, 2021 EX-99.1

WESTLAKE CHEMICAL CORPORATION

EXHIBIT 99.1 WESTLAKE CHEMICAL CORPORATION Contact?(713) 960-9111 Investors?Steve Bender Media?L. Benjamin Ederington Westlake Chemical Corporation Reports Third Quarter 2021 Results ?Record quarterly net sales of $3.1 billion ?Record quarterly net income of $607 million ?Record quarterly EBITDA of $1.1 billion ?Completed acquisitions of Boral?s North American building products businesses, Dimex L

November 2, 2021 EX-99.2

Third Quarter 2021 Earnings Presentation November 2, 2021 Westlake Chemical Third Quarter 2021 Highlights 2 Business Highlights  Westlake achieved record quarterly net income of $607 million and record EBITDA of $1.1 billion, anchored by strong marg

Third Quarter 2021 Earnings Presentation November 2, 2021 Westlake Chemical Third Quarter 2021 Highlights 2 Business Highlights ? Westlake achieved record quarterly net income of $607 million and record EBITDA of $1.

October 1, 2021 EX-99.1

Westlake Doubles its Portfolio in High-Growth North American Building Products Market

Exhibit 99.1 News Release Westlake Doubles its Portfolio in High-Growth North American Building Products Market ? Company completes acquisition of Boral Limited?s North American building products businesses for $2.15 billion ? Adds leading brands in premium roofing; siding, trim and shutters; decorative stone; and windows ? Additional product lines will broaden Westlake?s footprint into the fast-g

October 1, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): October 1, 2021 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Comm

September 23, 2021 CORRESP

September 23, 2021

2801 Post Oak Blvd., Suite 600 n Houston, Texas 77056 Tel: 713.960.9111 September 23, 2021 VIA EDGAR Securities and Exchange Commission Division of Corporation Finance Office of Life Sciences 100 F Street, N.E. Washington, D.C. 20549 Attention: Christie Wong Brian Cascio Re: WESTLAKE CHEMICAL CORP Form 10-K for the Fiscal Year Ended December 31, 2020 Filed February 24, 2021 File No. 001-32260 Ladi

August 19, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 19, 2021 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Comm

August 19, 2021 EX-99.1

NAPCO Pipe & Fittings Announces Completion of Acquisition of LASCO Fittings

Exhibit 99.1 NAPCO Pipe & Fittings Announces Completion of Acquisition of LASCO Fittings HOUSTON, August 19, 2021 ? North American Pipe Corporation (NAPCO), a subsidiary of Westlake Chemical Corporation (NYSE: WLK), today announced that it acquired LASCO Fittings LLC, a Brownsville, Tennessee-based, leading designer, engineer and manufacturer of injected-molded PVC fittings, from Aalberts, NV. ?We

August 19, 2021 EX-4.2

Fourteenth Supplemental Indenture (including the form of Notes), dated as of August 19, 2021, between Westlake Corporation and The Bank of New Mellon Trust Company, N.A., as trustee (incorporated by reference to Westlake Corporation's Current Report on Form 8-K filed on August 19, 2021, File No. 1-32260).

Exhibit 4.2 Execution Version WESTLAKE CHEMICAL CORPORATION 0.875% Senior Notes due 2024 2.875% Senior Notes due 2041 3.125% Senior Notes due 2051 3.375% Senior Notes due 2061 Fourteenth Supplemental Indenture Dated as of August 19, 2021 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. Trustee TABLE OF CONTENTS Page ARTICLE ONE Scope of Supplemental Indenture; General 2 ARTICLE TWO Certain Definiti

August 19, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 19, 2021 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Comm

August 6, 2021 EX-99.1

Westlake Announces Proposed Offering of Senior Notes

Exhibit 99.1 Westlake Announces Proposed Offering of Senior Notes HOUSTON, August 5, 2021 ? 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 subjec

August 6, 2021 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 5, 2021 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commi

August 6, 2021 EX-1.1

Underwriting Agreement by and among Westlake Chemical Corporation and Deutsche Bank Securities Inc., BofA Securities, Inc., Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Wells Fargo Securities, LLC, for themselves and as representatives of the other underwriters named therein, dated August 5, 2021.

Exhibit 1.1 Execution Version WESTLAKE CHEMICAL CORPORATION $300,000,000 0.875% Senior Notes due 2024 $350,000,000 2.875% Senior Notes due 2041 $600,000,000 3.125% Senior Notes due 2051 $450,000,000 3.375% Senior Notes due 2061 UNDERWRITING AGREEMENT August 5, 2021 Underwriting Agreement August 5, 2021 DEUTSCHE BANK SECURITIES INC. BOFA SECURITIES, INC. CITIGROUP GLOBAL MARKETS INC. J.P. MORGAN SE

August 6, 2021 EX-99.2

Westlake Announces Pricing of $1.7 Billion Offering of Senior Notes

Exhibit 99.2 Westlake Announces Pricing of $1.7 Billion Offering of Senior Notes HOUSTON, August 5, 2021 ? 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 u

August 6, 2021 424B5

CALCULATION OF REGISTRATION FEE Title of Each Class of Securities To Be Offered Maximum Aggregate Offering Price Amount of Registration Fee(1) 0.875% Senior Notes of Westlake Chemical Corporation due 2024 $300,000,000 $32,730 2.875% Senior Notes of W

424B5 1 d133206d424b5.htm 424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-234573 CALCULATION OF REGISTRATION FEE Title of Each Class of Securities To Be Offered Maximum Aggregate Offering Price Amount of Registration Fee(1) 0.875% Senior Notes of Westlake Chemical Corporation due 2024 $300,000,000 $32,730 2.875% Senior Notes of Westlake Chemical Corporation due 2041 $

August 5, 2021 424B5

Subject to Completion Preliminary Prospectus Supplement dated August 5, 2021

Table of Contents This preliminary prospectus supplement and the accompanying prospectus relate to an effective registration statement under the Securities Act of 1933, as amended, but are not complete and may be changed.

August 5, 2021 FWP

$1,700,000,000 Westlake Chemical Corporation $300,000,000 0.875% Senior Notes due 2024 $350,000,000 2.875% Senior Notes due 2041 $600,000,000 3.125% Senior Notes due 2051 $450,000,000 3.375% Senior Notes due 2061 Final Term Sheet August 5, 2021 Issue

Filed Pursuant to Rule 433 Registration No. 333-234573 Free Writing Prospectus (To Prospectus dated November 7, 2019 and Preliminary Prospectus Supplement dated August 5, 2021) $1,700,000,000 Westlake Chemical Corporation $300,000,000 0.875% Senior Notes due 2024 $350,000,000 2.875% Senior Notes due 2041 $600,000,000 3.125% Senior Notes due 2051 $450,000,000 3.375% Senior Notes due 2061 Final Term

August 3, 2021 EX-99.1

WESTLAKE CHEMICAL CORPORATION

EXHIBIT 99.1 WESTLAKE CHEMICAL CORPORATION Contact?(713) 960-9111 Investors?Steve Bender Media?L. Benjamin Ederington Westlake Chemical Corporation Reports Second Quarter 2021 Results ?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

August 3, 2021 EX-10.1

Equity Purchase Agreement, dated as of June 20, 2021, by and among Boral Building Products Inc., Boral Stone Products LLC, Boral Lifetile Inc., Boral Windows LLC, Boral Industries Inc., Royal Building Products (USA) Inc. and, solely for purposes of Section 10.20, Boral Limited and, solely for purposes of Section 10.21, Westlake Chemical Corporation.

Exhibit 10.1 EQUITY PURCHASE AGREEMENT BY AND AMONG BORAL BUILDING PRODUCTS INC., BORAL STONE PRODUCTS LLC, BORAL LIFETILE INC., BORAL WINDOWS LLC, BORAL INDUSTRIES INC., ROYAL BUILDING PRODUCTS (USA) INC. AND, SOLELY FOR PURPOSES OF SECTION 10.20, BORAL LIMITED AND, SOLELY FOR PURPOSES OF SECTION 10.21, WESTLAKE CHEMICAL CORPORATION Dated as of June 20, 2021 TABLE OF CONTENTS Page ARTICLE 1 PURCH

August 3, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 3, 2021 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commi

August 3, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

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, 2021 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 Corpora

August 3, 2021 EX-99.2

Second Quarter 2021 Earnings Presentation August 3, 2021 Westlake’s sustainability report can be found at https://www.westlake.com/sustainability Commitment to Corporate Social Responsibility is Formed by Five Longstanding Core Values 2 Advancing Sus

Second Quarter 2021 Earnings Presentation August 3, 2021 Westlake?s sustainability report can be found at https://www.

August 3, 2021 EX-10.2

Equity Purchase Agreement, dated as of July 4, 2021, by and among Aalberts U.S. Holding Corp. and North American Pipe Corporation.

Exhibit 10.2 EQUITY PURCHASE AGREEMENT by and among AALBERTS U.S. HOLDING CORP., and NORTH AMERICAN PIPE CORPORATION Dated as of July 4, 2021 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS 1 1.1 Definitions 1 ARTICLE II PURCHASE AND SALE OF PURCHASED INTERESTS 1 2.1 Purchase and Sale 1 2.2 Closing 1 2.3 Estimated Purchase Price 2 2.4 Closing Payments 2 2.5 Purchase Price Adjustment. 2 2.6 Tax Treatm

July 6, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): July 4, 2021 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commiss

July 6, 2021 EX-99.1

NAPCO Pipe & Fittings Announces Acquisition of LASCO Fittings, Inc.

Exhibit 99.1 NAPCO Pipe & Fittings Announces Acquisition of LASCO Fittings, Inc. HOUSTON, July 6, 2021 ? North American Pipe Corporation (NAPCO), a subsidiary of Westlake Chemical Corporation (NYSE: WLK), today announced that it will acquire LASCO Fittings, Inc., a Brownsville, Tennessee-based, leading designer, engineer and manufacturer of injected-molded PVC fittings from Aalberts, NV. ?We are p

June 21, 2021 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): June 20, 2021 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commis

June 21, 2021 EX-99.2

Acquisition Significantly Expands Westlake’s Leading Positions in Fast Growing Home Building Products Acquisition of Boral Limited’s North America building products business (‘BNA’) adds significant scale and product diversification to Westlake to br

Westlake Chemical Corporation Westlake Significantly Expands its Presence in the Growing North American Home Construction Materials Markets by Acquiring Boral?s North American Building Products Businesses (?BNA?) June 21, 2021 Exhibit 99.

June 21, 2021 EX-99.1

Westlake Significantly Expands its Presence in the Growing North American Home Construction Materials Markets by Acquiring Boral’s North American Building Products Businesses

Exhibit 99.1 Westlake Significantly Expands its Presence in the Growing North American Home Construction Materials Markets by Acquiring Boral?s North American Building Products Businesses ? Westlake Chemical Corporation will acquire Boral Ltd.?s North American building products businesses for $2.15 billion ? Acquisition will nearly double Westlake?s building products business by adding leading bra

May 21, 2021 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdict

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File Number) (I.R.S. Employer Identification No.) 2801 Post Oak Boulevard, Suite 600 Houston, Texas 77056 (Address o

May 17, 2021 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 13, 2021 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commiss

May 17, 2021 EX-3.1

Certificate of Amendment to the Amended and Restated Certificate of Incorporation of Westlake as filed with the Delaware Secretary of State on May 14, 2021 (incorporated by reference to Westlake’s Current Report on Form 8-K, filed on May 17, 2021, File No. 001-32260).

EX-3.1 2 ex3120210513.htm EX-3.1 Exhibit 3.1 CERTIFICATE OF AMENDMENT TO AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF WESTLAKE CHEMICAL CORPORATION Westlake Chemical Corporation (the "Corporation"), a corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware (the "DGCL"), hereby adopts this Certificate of Amendment, which amends the Amen

May 5, 2021 10-Q

Quarterly Report - 10-Q

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 March 31, 2021 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 Corpor

May 4, 2021 EX-99.1

WESTLAKE CHEMICAL CORPORATION

EXHIBIT 99.1 WESTLAKE CHEMICAL CORPORATION Contact?(713) 960-9111 Investors?Steve Bender Media?L. Benjamin Ederington Westlake Chemical Corporation Reports First Quarter 2021 Results ? 154% increase in first quarter 2021 operating income of $346 million vs first quarter 2020 HOUSTON-(BUSINESS WIRE)- Westlake Chemical Corporation (NYSE: WLK) (the "Company" or "Westlake") today reported net income a

May 4, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 4, 2021 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commissi

May 4, 2021 EX-99.2

First Quarter 2021 Earnings Presentation May 4, 2021 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 e

First Quarter 2021 Earnings Presentation May 4, 2021 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.

April 2, 2021 DEFA14A

- DEFA14A

DEFA14A 1 d36469ddefa14a.htm DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule

April 2, 2021 DEF 14A

- DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Definitive Proxy State

March 5, 2021 PRE 14A

- PRE 14A

PRE 14A 1 d36469dpre14a.htm PRE 14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 1

February 24, 2021 EX-10.21

Form of Performance Stock Unit Award Letter for 2021 Executive Officer Awards (incorporated by reference to Exhibit 10.21 to Westlake's Annual Report on Form 10-K for the year ended December 31, 2020 filed on February 24, 2021, File No. 001-32260).

EXHIBIT 10.21 %%OPTIONDATE,'Month DD, YYYY'%-% %%FIRSTNAMEMIDDLENAMELASTNAME%-% %%TITLE1%-% Re: WESTLAKE CHEMICAL CORPORATION PERFORMANCE STOCK UNIT AWARD Dear %%FIRSTNAME%-%: Westlake Chemical Corporation (the ?Company?) is pleased to notify you that, in consideration of your past and/or continued employment with or service to the Company and other good and valuable consideration and subject to y

February 24, 2021 EX-21

Subsidiaries of Westlake.

EXHIBIT 21 SUBSIDIARIES OF WESTLAKE * Name of Subsidiary State or Other Jurisdiction of Incorporation or Organization Names Doing Business Axiall Canada, Inc.

February 24, 2021 EX-10.20

Form of Restricted Stock Unit Award Letter for 2021 Executive Officer Awards (incorporated by reference to Exhibit 10.20 to Westlake's Annual Report on Form 10-K for the year ended December 31, 2020 filed on February 24, 2021, File No. 001-32260).

EXHIBIT 10.20 %%OPTIONDATE,'Month DD, YYYY'%-% %%FIRSTNAMEMIDDLENAMELASTNAME%-% %%TITLE1%-% Re: WESTLAKE CHEMICAL CORPORATION RESTRICTED STOCK UNIT AWARD Dear %%FIRSTNAME%-%: Westlake Chemical Corporation (the ?Company?) is pleased to notify you that, in consideration of your past and/or continued employment with or service to the Company and other good and valuable consideration and subject to yo

February 24, 2021 10-K

Annual Report - 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2020 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 Ch

February 24, 2021 EX-10.19

Form of Stock Option Award Letter for 2021 Executive Officer Awards.

EXHIBIT 10.19 %%OPTIONDATE,'Month DD, YYYY'%-% %%FIRSTNAMEMIDDLENAMELASTNAME%-% %%TITLE1%-% Re: WESTLAKE CHEMICAL CORPORATION NONQUALIFIED STOCK OPTION AWARD Dear %%FIRSTNAME%-%: Westlake Chemical Corporation (the ?Company?) is pleased to notify you that, in consideration of your past and/or continued employment with or service to the Company and other good and valuable consideration and subject t

February 23, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 23, 2021 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Co

February 23, 2021 EX-99.1

WESTLAKE CHEMICAL CORPORATION

EXHIBIT 99.1 WESTLAKE CHEMICAL CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media— L. Benjamin Ederington Westlake Chemical Corporation Reports Fourth Quarter and Full Year 2020 Results •Fourth quarter 2020 net income increased $41 million, or 57%, over fourth quarter 2019 HOUSTON-(BUSINESS WIRE)- Westlake Chemical Corporation (NYSE: WLK) (the "Company" or "Westlake") today reported n

February 23, 2021 EX-99.2

Fourth Quarter and Full Year 2020 Earnings Presentation February 23, 2021 Westlake’s commitment to social responsibility and advancing sustainability is formed by the company’s longstanding core values:  Health, Safety & Environmental - The vigilant

Fourth Quarter and Full Year 2020 Earnings Presentation February 23, 2021 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.

February 5, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 16)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 16)* WESTLAKE CHEMICAL CORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 960413102 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whi

November 18, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 18, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Co

November 18, 2020 EX-99.1

Westlake Appoints Roger Kearns as Chief Operating Officer

EX-99.1 Exhibit 99.1 Westlake Appoints Roger Kearns as Chief Operating Officer HOUSTON—Nov. 18, 2020 – Westlake Chemical Corporation (NYSE: WLK) announced today that Mr. Roger Kearns has been appointed by the Board of Directors as Executive Vice President and Chief Operating Officer, effective January 1, 2021. In this new role, he will continue to report to Mr. Albert Chao, Westlake’s President an

November 4, 2020 10-Q

Quarterly Report - 10-Q

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, 2020 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 Co

November 3, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 3, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Com

November 3, 2020 EX-99.2

EXHIBIT 99.2 Third Quarter 2020 Earnings Presentation November 3, 2020 EXHIBIT 99.2 Commitment to Social Responsibility and Advancing Sustainability Westlake’s commitment to social responsibility and advancing sustainability is formed by the company’

ex992investorpresentaf5e EXHIBIT 99.2 Third Quarter 2020 Earnings Presentation November 3, 2020 EXHIBIT 99.2 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

November 3, 2020 EX-99.1

WESTLAKE CHEMICAL CORPORATION

EXHIBIT 99.1 WESTLAKE CHEMICAL CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Chemical Corporation Reports Third Quarter 2020 Results • Third quarter net income of $57 million, or $0.45 per diluted share • Lake Charles, Louisiana olefins and vinyls facilities impacted by Hurricane Laura • Third quarter net income includes pre-tax restructuring charg

September 21, 2020 EX-99.1

Vinnolit Issues Statement Regarding PVC Production in Schkopau

EXHIBIT 99.1 Vinnolit Issues Statement Regarding PVC Production in Schkopau Ismaning/Schkopau, 21 September 2020 - Vinnolit GmbH & Co. KG (“Vinnolit”) today issued a statement that it has initiated consultations with the works council at its Schkopau site regarding the closure of the site’s paste polyvinyl chloride (“PVC”) plant. The decision was driven by the plant’s lack of economic viability an

September 21, 2020 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): September 21, 2020 Westlake Chemi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): September 21, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (C

September 8, 2020 EX-99.1

Westlake Chemical Corporation Updates Statement on Lake Charles Operations

EXHIBIT 99.1 Westlake Chemical Corporation Updates Statement on Lake Charles Operations HOUSTON - Sept. 8, 2020 - Westlake Chemical Corporation (NYSE: WLK) today issued a statement updating the impact of Hurricane Laura, which made landfall near its plants in the Lake Charles, Louisiana area. In the aftermath of Hurricane Laura, the safety of our employees and the integrity of our operations in th

September 8, 2020 8-K

Financial Statements and Exhibits, Other Events - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): September 8, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Co

August 28, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 27, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Comm

August 28, 2020 EX-99.1

Westlake Chemical Corporation Issues Statement on Lake Charles Operations

EXHIBIT 99.1 Westlake Chemical Corporation Issues Statement on Lake Charles Operations HOUSTON - August 27, 2020 - Westlake Chemical Corporation (NYSE: WLK) today issued a statement regarding Hurricane Laura, which made landfall near its plants in the Lake Charles, Louisiana area. Westlake’s primary concern is for the safety of our employees. The employees who stayed at our facilities during Hurri

August 6, 2020 EX-99.2

EXHIBIT 99.2 Second Quarter 2020 Earnings Presentation August 6, 2020 EXHIBIT 99.2 Westlake’s Commitment to Social Responsibility and Advancing Sustainability Westlake’s commitment to social responsibility and advancing sustainability is formed by th

ex992investorpresentatio EXHIBIT 99.2 Second Quarter 2020 Earnings Presentation August 6, 2020 EXHIBIT 99.2 Westlake’s 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 sust

August 6, 2020 EX-99.1

WESTLAKE CHEMICAL CORPORATION

EXHIBIT 99.1 WESTLAKE CHEMICAL CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Chemical Corporation Reports Second Quarter 2020 Results HOUSTON-(BUSINESS WIRE)- Westlake Chemical Corporation (NYSE: WLK) (the "Company" or "Westlake") today reported net income attributable to Westlake for the three months ended June 30, 2020 of $15 million, or $0.11 pe

August 6, 2020 10-Q

Quarterly Report - 10-Q

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, 2020 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 Corpora

August 6, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 6, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commi

July 14, 2020 EX-99.1

Westlake Chemical Corporation Issues Statement Regarding European Commission Investigation

EX-99.1 Exhibit 99.1 Westlake Chemical Corporation Issues Statement Regarding European Commission Investigation HOUSTON, July 14, 2020 – Westlake Chemical Corporation (NYSE: WLK) today confirmed that one of its subsidiaries has been named in a European Commission decision regarding certain anti-competitive practices in the purchasing of ethylene that occurred prior to 2017. The practices were unco

July 14, 2020 8-K

Financial Statements and Exhibits, Other Events - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): July 14, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commis

June 12, 2020 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): June 12, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commis

June 12, 2020 EX-4.2

Thirteenth Supplemental Indenture (including the form of Notes), dated as of June 12, 2020, between Westlake Corporation and The Bank of New Mellon Trust Company, N.A., as trustee (incorporated by reference to Westlake

EX-4.2 Exhibit 4.2 WESTLAKE CHEMICAL CORPORATION 3.375% Senior Notes due 2030 Thirteenth Supplemental Indenture Dated as of June 12, 2020 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. Trustee TABLE OF CONTENTS Page ARTICLE ONE Scope of Supplemental Indenture; General 2 ARTICLE TWO Certain Definitions 2 ARTICLE THREE Redemption 9 Section 3.01. Selection of Securities To Be Redeemed 9 Section 3.02

June 10, 2020 EX-99.1

Westlake Announces Proposed Offering of Senior Notes

EX-99.1 Exhibit 99.1 Westlake Announces Proposed Offering of Senior Notes HOUSTON, June 9, 2020 — 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

June 10, 2020 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): June 9, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commiss

June 10, 2020 424B5

CALCULATION OF REGISTRATION FEE Title of Each Class of Securities To Be Offered Maximum Aggregate Offering Price Amount of Registration Fee (1) 3.375% Senior Notes of Westlake Chemical Corporation due 2030 $300,000,000 $38,940

424B5 Table of Contents Pursuant to Rule 424(b)(5) Registration No. 333-234573 CALCULATION OF REGISTRATION FEE Title of Each Class of Securities To Be Offered Maximum Aggregate Offering Price Amount of Registration Fee (1) 3.375% Senior Notes of Westlake Chemical Corporation due 2030 $300,000,000 $38,940 (1) Pursuant to Rule 457(r) under the Securities Act of 1933, as amended. Table of Contents PR

June 10, 2020 EX-99.2

Westlake Announces Pricing of Offering of Senior Notes

EX-99.2 Exhibit 99.2 Westlake Announces Pricing of Offering of Senior Notes HOUSTON, June 9, 2020—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 2030 (the “Notes”) under its existing shelf registration statement. The Notes will be

June 10, 2020 EX-1.1

Underwriting Agreement by and among Westlake Chemical Corporation and Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Wells Fargo Securities, LLC, for themselves and as representatives of the other underwriters named therein, dated June 9, 2020.

EX-1.1 Exhibit 1.1 WESTLAKE CHEMICAL CORPORATION $300,000,000 3.375% Senior Notes due 2030 UNDERWRITING AGREEMENT June 9, 2020 Citigroup Global Markets Inc. J.P. Morgan Securities LLC Wells Fargo Securities, LLC Underwriting Agreement June 9, 2020 CITIGROUP GLOBAL MARKETS INC. J.P. MORGAN SECURITIES LLC WELLS FARGO SECURITIES, LLC As Representatives of the several Underwriters c/o Citigroup Global

June 9, 2020 FWP

$300,000,000 Westlake Chemical Corporation 3.375% Senior Notes due 2030 Final Term Sheet June 9, 2020 Issuer: Westlake Chemical Corporation Ratings (Moody’s / S&P / Fitch)* Baa2 / BBB- / BBB Principal Amount: $300,000,000 Maturity Date: June 15, 2030

FWP Filed Pursuant to Rule 433 Registration No. 333-234573 Free Writing Prospectus (To Prospectus dated November 7, 2019 and Preliminary Prospectus Supplement dated June 9, 2020) $300,000,000 Westlake Chemical Corporation 3.375% Senior Notes due 2030 Final Term Sheet June 9, 2020 Issuer: Westlake Chemical Corporation Ratings (Moody’s / S&P / Fitch)* Baa2 / BBB- / BBB Principal Amount: $300,000,000

June 9, 2020 424B5

Subject to Completion Preliminary Prospectus Supplement dated June 9, 2020

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-234573 This preliminary prospectus supplement and the accompanying prospectus relate to an effective registration statement under the Securities Act of 1933, as amended, but are not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securitie

June 4, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): June 4, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commiss

May 22, 2020 SD

- SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File Number) (I.R.S. Employer Identification No.) 2801 Post Oak Boulevard, Suite 600 Houston, Texas 77056 (Address o

May 18, 2020 EX-99.1

Kimberly Lubel Elected to Westlake Chemical Corporation Board of Directors

EX-99.1 Exhibit 99.1 Kimberly Lubel Elected to Westlake Chemical Corporation Board of Directors HOUSTON, May 15, 2020 – Westlake Chemical Corporation (NYSE: WLK) today announced that Ms. Kimberly S. Lubel has been elected to serve on the company’s board of directors as a new member. Ms. Lubel was elected to serve a three-year term at the company’s Annual Meeting of Stockholders, held today. Ms. Lu

May 18, 2020 8-K

Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 15, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commiss

May 6, 2020 10-Q

Quarterly Report - 10-Q

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 March 31, 2020 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 Corpor

May 4, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 4, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commissi

May 4, 2020 EX-99.2

Westlake Chemical Corporation First Quarter 2020 Earnings Presentation May 4, 2020 Westlake Chemical COVID–19 Review Health and Safety . The government has designated our sector as "critical infrastructure" during this time permitting Westlake to con

investorpresentationq120 Westlake Chemical Corporation First Quarter 2020 Earnings Presentation May 4, 2020 Westlake Chemical COVID–19 Review Health and Safety .

May 4, 2020 EX-99.1

WESTLAKE CHEMICAL CORPORATION

EXHIBIT 99.1 WESTLAKE CHEMICAL CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Chemical Corporation Reports First Quarter 2020 Results • Net income of $1.13 per diluted share, or $145 million, for the first quarter of 2020 • Cash and cash equivalents of $1.54 billion • EBITDA of $337 million for the first quarter of 2020 HOUSTON-(BUSINESS WIRE)- West

April 3, 2020 DEF 14A

WLK / Westlake Chemical Corp. DEF 14A - - DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

April 3, 2020 DEFA14A

WLK / Westlake Chemical Corp. DEFA14A - - DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

March 20, 2020 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): March 20, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commi

February 19, 2020 EX-21

Subsidiaries of Westlake.

EXHIBIT 21 SUBSIDIARIES OF WESTLAKE * Name of Subsidiary State or Other Jurisdiction of Incorporation or Organization Names Doing Business Axiall Canada, Inc.

February 19, 2020 EX-4.1

Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 (incorporated by reference to Exhibit 4.1 to Westlake's Annual Report on Form 10-K for the year ended December 31, 2019, File No. 1-32260).

EXHIBIT 4.1 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Common Stock The following is a summary of Westlake Chemical Corporation’s (“Westlake,” “we,” “us” and “our”) common stock, par value $0.01 per share, which is listed on the New York Stock Exchange under the symbol “WLK.” This summary does not purport to be complete and i

February 19, 2020 10-K

Annual Report - 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 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 Ch

February 18, 2020 EX-99.2

Westlake Chemical Corporation Fourth Quarter and Year-End 2019 Earnings Presentation February 18, 2020 Westlake Chemical 2019 Highlights Business Highlights . Net income of $421 million; EBITDA of $1.4 billion; Cash flows from operations of $1.3 bill

ex992investorpresentatio Westlake Chemical Corporation Fourth Quarter and Year-End 2019 Earnings Presentation February 18, 2020 Westlake Chemical 2019 Highlights Business Highlights .

February 18, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 13, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Co

February 18, 2020 EX-99.1

Westlake Chemical Appoints Johnathan Zoeller Chief Accounting Officer

EX-99.1 Exhibit 99.1 Westlake Chemical Appoints Johnathan Zoeller Chief Accounting Officer HOUSTON, February 18, 2020 – Westlake Chemical Corporation (NYSE: WLK) today announced that its board of directors has appointed Johnathan Zoeller, 44, to serve as the company’s vice president and chief accounting officer. His appointment will become effective upon the retirement of his predecessor, George M

February 18, 2020 EX-99.1

WESTLAKE CHEMICAL CORPORATION

EXHIBIT 99.1 WESTLAKE CHEMICAL CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media— L. Benjamin Ederington Westlake Chemical Corporation Reports Fourth Quarter and Full Year 2019 Results •Record sales volumes in 2019 HOUSTON-(BUSINESS WIRE)- Westlake Chemical Corporation (NYSE: WLK) (the "Company" or "Westlake") today reported net income attributable to Westlake for the three months en

February 18, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 18, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Co

January 31, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): January 27, 2020 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Com

January 24, 2020 SC 13G/A

WLK / Westlake Chemical Corp. / TTWF LP Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 15)* WESTLAKE CHEMICAL CORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 960413102 (CUSIP Number) December 31, 2019 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whi

November 18, 2019 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 12, 2019 Westlake Chemical Corporation (Exact Name of Registrant as Specified in its Charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

November 7, 2019 S-3ASR

WLK / Westlake Chemical Corp. S-3ASR - - S-3ASR

S-3ASR Table of Contents As filed with the Securities and Exchange Commission on November 7, 2019 Registration No.

November 7, 2019 EX-25.1

Form T-1 Statement of Eligibility of The Bank of New York Mellon Trust Company, N.A. as Trustee with respect to the Indenture, dated as of January 1, 2006.

EX-25.1 Exhibit 25.1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (Exact name of trustee as specified in its char

November 6, 2019 10-Q

Quarterly Report - 10-Q

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 Co

November 5, 2019 EX-99.2

Third Quarter 2019 Earnings Presentation November 5, 2019 Westlake Chemical Corporation Business Highlights . Net income of $158 million for the third quarter of 2019; 33% improvement over the second quarter of 2019 . Issued EUR 700,000,000 of senior

ex992investorpresentatio Third Quarter 2019 Earnings Presentation November 5, 2019 Westlake Chemical Corporation Business Highlights .

November 5, 2019 EX-99.1

WESTLAKE CHEMICAL CORPORATION

EXHIBIT 99.1 WESTLAKE CHEMICAL CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Chemical Corporation Reports Third Quarter 2019 Results HOUSTON-(BUSINESS WIRE)- Westlake Chemical Corporation (NYSE: WLK) (the "Company" or "Westlake") today reported net income attributable to Westlake for the three months ended September 30, 2019 of $158 million, or $1.

November 5, 2019 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 5, 2019 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Com

October 30, 2019 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 29, 2019 Westlake Chemical Corporation (Exact Name of Registrant as Specified in its Charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

August 6, 2019 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 6, 2019 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation) (Commi

August 6, 2019 EX-99.2

Westlake Chemical Corporation Second Quarter 2019 Earnings Presentation Westlake Chemical Corporation Business Highlights . Net income of $129 million for the second quarter of 2019; 57% improvement over the first quarter of 2019 . Started-up our 2.2

ex992investorpresentatio Westlake Chemical Corporation Second Quarter 2019 Earnings Presentation Westlake Chemical Corporation Business Highlights .

August 6, 2019 EX-99.1

WESTLAKE CHEMICAL CORPORATION

EXHIBIT 99.1 WESTLAKE CHEMICAL CORPORATION Contact—(713) 960-9111 Investors—Steve Bender Media— L. Benjamin Ederington Westlake Chemical Corporation Reports Second Quarter 2019 Results HOUSTON-(BUSINESS WIRE)- Westlake Chemical Corporation (NYSE: WLK) (the "Company" or "Westlake") today reported net income attributable to Westlake for the three months ended June 30, 2019 of $119 million, or $0.92

August 6, 2019 10-Q

Quarterly Report - 10-Q

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 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 Corpora

July 17, 2019 8-A12B

WLK / Westlake Chemical Corp. 8-A12B - - 8-A12B

8-A12B 1 d770864d8a12b.htm 8-A12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 WESTLAKE CHEMICAL CORPORATION (Exact name of registrant as specified in its charter) Delaware 76-0346924 (State of Incorporation or Organization) (I.R.S. Employe

July 17, 2019 EX-4.2

Twelfth Supplemental Indenture (including the form of the Notes), dated as of July 17, 2019, between Westlake Chemical Corporation and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.2 to Westlake's Current Report on Form 8-K filed on July 17, 2019, File No. 1-32260).

EX-4.2 Exhibit 4.2 Execution Version WESTLAKE CHEMICAL CORPORATION 1.625% Senior Notes due 2029 Twelfth Supplemental Indenture Dated as of July 17, 2019 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. Trustee TABLE OF CONTENTS Page ARTICLE ONE Scope of Supplemental Indenture; General 2 ARTICLE TWO Certain Definitions 2 ARTICLE THREE Redemption 9 Section 3.12. Optional Redemption 9 Section 3.13. Re

July 17, 2019 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

Form 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): July 17, 2019 Westlake Chemical Corporation (Exact name of registrant as specified in its charter) Delaware 001-32260 76-0346924 (State or other jurisdiction of incorporation

July 17, 2019 EX-4.4

Paying Agency Agreement dated as of July 17, 2019, between Westlake Chemical Corporation and The Bank of New York Mellon, London Branch, as paying agent (incorporated by reference to Exhibit 4.4 to Westlake's Current Report on Form 8-K, filed on July 17, 2019, File No. 1-32260).

EX-4.4 Exhibit 4.4 EXECUTION VERSION Dated: July 17, 2019 Westlake Chemical Corporation as Issuer and The Bank of New York Mellon, London Branch as Paying Agent PAYING AGENCY AGREEMENT THIS AGREEMENT is made as of July 17, 2019 between Westlake Chemical Corporation (the “Issuer”), and The Bank of New York Mellon, London Branch as paying agent (the “Paying Agent”), located at One Canada Square, Lon

July 11, 2019 424B5

CALCULATION OF REGISTRATION FEE Title of each class of securities to be registered Proposed maximum aggregate offering price(l) Amount of registration fee(l) 1.625% Senior Notes due 2029 $781,178,697.60 $94,678.86

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-213548 CALCULATION OF REGISTRATION FEE Title of each class of securities to be registered Proposed maximum aggregate offering price(l) Amount of registration fee(l) 1.625% Senior Notes due 2029 $781,178,697.60 $94,678.86 (1) Pursuant to Rule 457(r) under the Securities Act of 1933, as amended. €700,000,000 aggregate prin

July 11, 2019 EX-99.1

Westlake Chemical Announces Pricing of Offering of Senior Notes

EX-99.1 Exhibit 99.1 2801 Post Oak Blvd., Suite 600 ● Houston, Texas 77056 Tel 713.960.9111 ● Fax 713.629-6239 Westlake Chemical Announces Pricing of Offering of Senior Notes HOUSTON—(BUSINESS WIRE)—July 10, 2019— Westlake Chemical Corporation (NYSE: WLK) (“Westlake”) announced today that it has priced its previously announced underwritten public offering of EUR700,000,000 aggregate principal amou

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