WESTLAKE CORP
For the period ended Dec 31, 2025. Filed Feb 26, 2026.
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FY2025 · Filed Feb 26, 2026
WLK$63.16-1.5%Stored close · as of Nov 10, 2026
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Item 15. Exhibits and Financial Statement Schedules
| (a)(1) | The financial statements listed in the Index to Consolidated Financial Statements in Item 8 of this Form 10-K are filed as part of this Form 10-K. |
|---|---|
| (a)(2) | All schedules are omitted because the information is not applicable, not required, or has been furnished in the Consolidated Financial Statements or Notes thereto in Item 8 of this Form 10-K. |
| (a)(3) | Exhibits |
| Exhibit No. | Exhibit Index |
| 3.1 | Restated Certificate of Incorporation of Westlake as filed with the Delaware Secretary of State on February 20, 2024 2024 (incorporated by reference 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). |
| 3.2 | Second 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). |
| 4.1 | Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 (incorporated by reference 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). |
| 4.2 | Indenture dated as of January 1, 2006 by and among Westlake, the potential subsidiary guarantors listed therein and JPMorgan Chase Bank, National Association, as trustee (incorporated by reference to Westlake's Current Report on Form 8-K, filed on January 13, 2006, File No. 1-32260). |
| 4.3 | Eighth Supplemental Indenture (including the form of the Notes), dated as of August 10, 2016, among Westlake Corporation, the Guarantors (as defined therein) 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 August 10, 2016, File No. 001-32260). |
| 4.4 | Tenth Supplemental Indenture (including the form of the Notes), dated as of November 29, 2017, among Westlake Corporation, the Subsidiary Guarantors (as defined therein) 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 November 28, 2017, File No. 001-32260). |
| 4.5 | Eleventh Supplemental Indenture (including the form of the Notes), dated as of November 28, 2017, among Westlake Corporation, the Subsidiary Guarantors (as defined therein) and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.3 to Westlake's Current Report on Form 8-K, filed on November 28, 2017, File No. 001-32260). |
| 4.6 | Twelfth Supplemental Indenture (including the form of the Notes), dated as of July 17, 2019, between Westlake 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). |
| 4.7 | 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's Current Report on Form 8-K filed on June 12, 2020, File No. 1-32260). |
| 4.8 | Fourteenth Supplemental Indenture (including the Notes), dated as of August 19, 2021, between Westlake 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 August 19, 2021, File No. 001-32260). |
| 4.9† | Fifteenth Supplemental Indenture (including the Notes), dated as of November 6, 2025, between Westlake Corporation and The Bank of New York Mellon Trust Company, N.A., as trustee. |
| 4.10 | Paying Agency Agreement dated as of July 17, 2019, between Westlake 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). |
| Westlake and its subsidiaries are party to other long-term debt instruments not filed herewith under which the total amount of securities authorized does not exceed 10% of the total assets of Westlake and its subsidiaries on a consolidated basis. Pursuant to paragraph 4(iii)(A) of Item 601(b) of Regulation S-K, Westlake agrees to furnish a copy of such instruments to the SEC upon request. |
| Exhibit No. | Exhibit Index |
| 10.1 | Amended and Restated Loan Agreement, dated as of November 1, 2017, by and between the Louisiana Local Government Environmental Facilities and Community Development Authority and Westlake Corporation (incorporated by reference to Exhibit 4.6 to Westlake's Current Report on Form 8-K, filed on November 28, 2017, File No. 001-32260). |
| 10.2 | Amended and Restated Senior Unsecured Revolving Credit Agreement by and among Westlake Chemical OpCo LP, Westlake Polymers LLC and the lenders party thereto, dated as of June 1, 2017 (incorporated by reference to Exhibit 10.9 to Westlake Chemical Partners LP's Annual Report on Form 10-K for the year ended December 31, 2019, filed on February 28, 2020, File No. 001-36567). |
| 10.3 | First Amendment to Amended and Restated Senior Unsecured Revolving Credit Agreement (incorporated by reference to Exhibit 10.1 to Westlake Chemical Partners LP's Quarterly Report on Form 10-Q for the quarter ended September 30, 2018, filed on November 6, 2018, File No. 001-36567). |
| 10.4 | Second Amendment to Amended and Restated Senior Unsecured Revolving Credit Agreement by and among Westlake Chemical OpCo LP, Westlake Polymers LLC, and the lenders party thereto, dated as of July 12, 2022 (incorporated by reference to Exhibit 10.1 to Westlake Chemical Partners LP's Current Report on Form 8-K, filed on July 15, 2022, File No. 001-36567). |
| 10.5 | Senior Unsecured Revolving Credit Agreement by and among Westlake Chemical Partners LP and Westlake Chemical Finance Corporation, dated as of April 29, 2015 (incorporated by reference to Exhibit 10.1 to Westlake Chemical Partners LP's Current Report on Form 8-K filed on April 30, 2015, File No. 001-36567). |
| 10.6 | First Amendment to Senior Unsecured Revolving Credit Agreement by and between Westlake Chemical Partners LP, as borrower, and Westlake Chemical Finance Corporation, as lender, dated as of August 1, 2017 (incorporated by reference to Exhibit 10.1 to Westlake Chemical Partners LP's Quarterly Report on Form 10-Q for the quarter ended June 30, 2017, File No. 001-36567). |
| 10.7 | Second Amendment to Senior Unsecured Revolving Credit Agreement by and between Westlake Chemical Partners LP, as borrower, and Westlake Chemical Finance Corporation, as lender, dated as of November 28, 2017 (incorporated herein by reference to Exhibit 10.12 to Westlake's Annual Report on Form 10-K for the year ended December 31, 2017, filed on February 21, 2018, File No. 001-32260). |
| 10.8 | Third Amendment to Senior Unsecured Revolving Credit Agreement by and between Westlake Chemical Partners LP, as borrower, and Westlake Chemical Finance Corporation, as lender, dated as of March 19, 2020 (incorporated herein by reference to Exhibit 10.1 to Westlake Chemical Partners LP's Quarterly Report on Form 10-Q for the quarter ended March 31, 2020, filed on May 6, 2020, File No. 001-36567). |
| 10.9 | Fourth Amendment to Senior Unsecured Revolving Credit Agreement by and between Westlake Chemical Partners LP, as borrower, and Westlake Chemical Finance Corporation, as lender, dated as of July 12, 2022 (incorporated herein by reference to Exhibit 10.2 to Westlake Chemical Partners LP's Current Report on Form 8-K, filed on July 15, 2022, File No. 001-36567). |
| 10.10 | 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). |
| 10.11 | Form of Registration Rights Agreement between Westlake and TTWF LP (incorporated by reference to Exhibit 10.13 to Westlake's Registration Statement on Form S-1/A, filed on July 2, 2004, File No.333-115790). |
| 10.12+ | Westlake Corporation 2013 Omnibus Incentive Plan (as amended and restated as of May 19, 2017) (incorporated by reference to Appendix B to Westlake's Definitive Proxy Statement on Schedule 14A filed on April 7, 2017, File No.1-32260). |
| 10.13+ | Westlake Corporation 2013 Omnibus Incentive Plan (as amended and restated effective May 11, 2023) (incorporated by reference to Appendix B to Westlake's Definitive Proxy Statement on Schedule 14A filed on March 31, 2023, File No.1-32260). |
| 10.14+ | Westlake Corporation Amended and Restated Annual Incentive Plan as of May 11, 2023 (incorporated by reference to Westlake's Quarterly Report on Form 10-Q for the quarter ended June 30, 2023, filed on August 3, 2023, File No. 001-32260). |
| Exhibit No. | Exhibit Index |
| 10.15 | Investment Management Agreement among Westlake Corporation, Westlake Chemical OpCo LP and Westlake Chemical Partners LP, dated as of August 1, 2017 (incorporated herein by reference to Exhibit 10.1 to Westlake's Quarterly Report on Form 10-Q for the quarter ended September 30, 2017, filed on November 7, 2017, File No. 001-32260). |
| 10.16+ | 2015 Form of Stock Option Award Letter for Executive Officer Awards (incorporated by reference to Exhibit 10.3 to Westlake's Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 filed on May 6, 2015, File No. 001-32260). |
| 10.17+ | 2018 Form of Stock Option Award Letter for 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, 2017 filed on February 21, 2018, File No. 001-32260). |
| 10.18+ | 2021 Form of Stock Option Award Letter for Executive Officer Awards (incorporated by reference to Exhibit 10.19 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). |
| 10.19+ | 2023 Form of Restricted Stock Unit Award Letter for Executive Officer Awards (incorporated by reference to Exhibit 10.3 to Westlake's Quarterly Report on Form 10-Q for the quarter ended June 30, 2023 filed on August 3, 2023, File No. 001-32260). |
| 10.20+ | 2024 Form of Stock Option Award Letter for Executive Officer Awards (incorporated by reference 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). |
| 10.21+ | 2024 Form of Performance Stock Unit Award Letter for Executive Officer Awards (incorporated by reference 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). |
| 19 | Westlake Corporation Insider Trading Policy (incorporated by reference to Westlake’s Annual Report on Form 10-K for the year ended December 31, 2024, filed on February 25, 2025, File No. 001-32260). |
| 21† | Subsidiaries of Westlake. |
| 23.1† | Consent of PricewaterhouseCoopers LLP. |
| 31.1† | Rule 13a-14(a) / 15d-14(a) Certification (Principal Executive Officer). |
| 31.2† | Rule 13a-14(a) / 15d-14(a) Certification (Principal Financial Officer). |
| 32.1†† | Section 1350 Certification (Principal Executive Officer and Principal Financial Officer). |
| 97 | Westlake Corporation Policy for Recovery of Erroneously Awarded Compensation, effective as of October 2, 2023 (incorporated by reference 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). |
| 101.INS† | XBRL Instance Document-The instance document does not appear in the interactive data file because its XBRL tags are embedded within the Inline XBRL document. |
| 101.SCH† | XBRL Taxonomy Extension Schema Document. |
| 101.CAL† | XBRL Taxonomy Extension Calculation Linkbase Document. |
| 101.DEF† | XBRL Taxonomy Extension Definition Linkbase Document. |
| 101.LAB† | XBRL Taxonomy Extension Label Linkbase Document. |
| 101.PRE† | XBRL Taxonomy Extension Presentation Linkbase Document. |
| 104 | Cover Page Interactive Data File-The cover page interactive data file does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document and contained in Exhibit 101. |
† Filed herewith.
†† Furnished herewith.
- Management contract, compensatory plan or arrangement.
- On February 18, 2022, Westlake Chemical Corporation changed its corporate name to Westlake Corporation. Accordingly, filings made prior to such date were made under the name Westlake Chemical Corporation.
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