Westlake Corp SEC filings WLK
Westlake Corp has 1,010 filings in SEC EDGAR's recent list, going back to Feb 20, 2015. Its latest annual report, Form ARS, was filed on Apr 2, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 4, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 4, 2026 (results of operations, regulation fd disclosure). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Sep 1, 2026 | Aug 31, 2026 |
| 3 | Initial insider ownership | Aug 31, 2026 | Aug 31, 2026 |
| 4 | Insider transaction | Aug 17, 2026 | Aug 14, 2026 |
| 4 | Insider transaction | Aug 17, 2026 | Aug 14, 2026 |
| 4 | Insider transaction | Aug 17, 2026 | Aug 14, 2026 |
| 4 | Insider transaction | Aug 17, 2026 | Aug 14, 2026 |
| 4 | Insider transaction | Aug 17, 2026 | Aug 14, 2026 |
| 4 | Insider transaction | Aug 17, 2026 | Aug 14, 2026 |
| 4 | Insider transaction | Aug 17, 2026 | Aug 14, 2026 |
| 4 | Insider transaction | Aug 17, 2026 | Aug 14, 2026 |
| 4 | Insider transaction | Aug 17, 2026 | Aug 14, 2026 |
| 4 | Insider transaction | Aug 17, 2026 | Aug 14, 2026 |
| 4 | Insider transaction | Aug 11, 2026 | Aug 11, 2026 |
| 144 | Notice of proposed sale | Aug 11, 2026 | — |
| 4 | Insider transaction | Aug 10, 2026 | Aug 8, 2026 |
| 4 | Insider transaction | Aug 10, 2026 | Aug 8, 2026 |
| 4 | Insider transaction | Aug 10, 2026 | Aug 8, 2026 |
| 4 | Insider transaction | Aug 10, 2026 | Aug 8, 2026 |
| 4 | Insider transaction | Aug 10, 2026 | Aug 8, 2026 |
| 4 | Insider transaction | Aug 10, 2026 | Aug 8, 2026 |
| 4 | Insider transaction | Aug 10, 2026 | Aug 8, 2026 |
| 4 | Insider transaction | Aug 10, 2026 | Aug 8, 2026 |
| 4 | Insider transaction | Aug 10, 2026 | Aug 8, 2026 |
| 4 | Insider transaction | Jun 16, 2026 | Jun 15, 2026 |
| 3 | Initial insider ownership | Jun 15, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | May 14, 2026 | May 12, 2026 |
| 4 | Insider transaction | Apr 6, 2026 | Apr 2, 2026 |
| 3 | Initial insider ownership | Apr 2, 2026 | Apr 2, 2026 |
| 4 | Insider transaction | Mar 31, 2026 | Mar 30, 2026 |
| 144 | Notice of proposed sale | Mar 30, 2026 | — |
| 4 | Insider transaction | Mar 30, 2026 | Mar 27, 2026 |
| 144 | Notice of proposed sale | Mar 27, 2026 | — |
| 4/A | Filing | Mar 6, 2026 | Feb 16, 2022 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 27, 2026 |
| 144 | Notice of proposed sale | Feb 27, 2026 | — |
| 4 | Insider transaction | Feb 24, 2026 | Feb 20, 2026 |
| 3 | Initial insider ownership | Feb 23, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 19, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 19, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 19, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 19, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 19, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 19, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 19, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 19, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Dec 23, 2025 | Dec 22, 2025 |
| 144 | Notice of proposed sale | Dec 22, 2025 | — |
| 4 | Insider transaction | Dec 10, 2025 | Dec 10, 2025 |
| 4 | Insider transaction | Oct 3, 2025 | Oct 1, 2025 |
| 4 | Insider transaction | Aug 29, 2025 | Aug 28, 2025 |
| 4 | Insider transaction | Aug 11, 2025 | Aug 8, 2025 |
| 4 | Insider transaction | Aug 11, 2025 | Aug 8, 2025 |
| 4 | Insider transaction | Aug 11, 2025 | Aug 8, 2025 |
| 4 | Insider transaction | Aug 11, 2025 | Aug 8, 2025 |
| 4 | Insider transaction | Aug 11, 2025 | Aug 8, 2025 |
| 4 | Insider transaction | Aug 11, 2025 | Aug 8, 2025 |
| 4 | Insider transaction | Aug 11, 2025 | Aug 8, 2025 |
| 4 | Insider transaction | Aug 11, 2025 | Aug 8, 2025 |
| 4 | Insider transaction | Aug 11, 2025 | Aug 8, 2025 |
| 4 | Insider transaction | Jun 9, 2025 | Apr 22, 2025 |
| 4 | Insider transaction | Apr 15, 2025 | Apr 11, 2025 |
| 4 | Insider transaction | Apr 15, 2025 | Apr 11, 2025 |
| 3 | Initial insider ownership | Apr 14, 2025 | Apr 11, 2025 |
| 4/A | Filing | Mar 7, 2025 | Mar 5, 2025 |
| 4/A | Filing | Mar 6, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 4, 2025 | Feb 28, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 20, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 20, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 20, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 20, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 20, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 20, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 20, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 20, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 14, 2025 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 14, 2025 |
| 4 | Insider transaction | Dec 10, 2024 | Dec 10, 2024 |
| 3 | Initial insider ownership | Dec 10, 2024 | Dec 10, 2024 |
| 4 | Insider transaction | Dec 2, 2024 | Nov 29, 2024 |
| 144 | Notice of proposed sale | Nov 26, 2024 | — |
| 4 | Insider transaction | Nov 25, 2024 | Nov 22, 2024 |
| 144 | Notice of proposed sale | Nov 21, 2024 | — |
| 4 | Insider transaction | Sep 3, 2024 | Aug 30, 2024 |
| 4 | Insider transaction | Aug 26, 2024 | Aug 23, 2024 |
| 144 | Notice of proposed sale | Aug 23, 2024 | — |
| 4 | Insider transaction | Aug 19, 2024 | Aug 16, 2024 |
| 144 | Notice of proposed sale | Aug 16, 2024 | — |
| 4 | Insider transaction | Aug 15, 2024 | Aug 13, 2024 |
| 4 | Insider transaction | Aug 15, 2024 | Aug 13, 2024 |
| 4 | Insider transaction | Aug 15, 2024 | Aug 13, 2024 |
| 4 | Insider transaction | Aug 12, 2024 | Aug 9, 2024 |
| 4 | Insider transaction | Aug 12, 2024 | Aug 9, 2024 |
| 4 | Insider transaction | Aug 12, 2024 | Aug 9, 2024 |
| 4 | Insider transaction | Aug 12, 2024 | Aug 9, 2024 |
| 4 | Insider transaction | Aug 12, 2024 | Aug 9, 2024 |
| 4 | Insider transaction | Aug 12, 2024 | Aug 9, 2024 |
| 4 | Insider transaction | Aug 12, 2024 | Aug 9, 2024 |
| 4 | Insider transaction | Aug 12, 2024 | Aug 9, 2024 |
| 4 | Insider transaction | Aug 12, 2024 | Aug 9, 2024 |
| 4 | Insider transaction | Jul 16, 2024 | Jul 15, 2024 |
| 3 | Initial insider ownership | Jul 15, 2024 | Jul 15, 2024 |
| 4 | Insider transaction | May 13, 2024 | May 9, 2024 |
| 4 | Insider transaction | May 13, 2024 | May 12, 2024 |
| 4 | Insider transaction | May 13, 2024 | May 12, 2024 |
| 4 | Insider transaction | May 8, 2024 | May 7, 2024 |
| 144 | Notice of proposed sale | May 6, 2024 | — |
| 4 | Insider transaction | May 6, 2024 | May 3, 2024 |
| 144 | Notice of proposed sale | May 3, 2024 | — |
| 3 | Initial insider ownership | May 2, 2024 | Apr 25, 2024 |
| 4 | Insider transaction | Apr 1, 2024 | Mar 28, 2024 |
| 4 | Insider transaction | Mar 22, 2024 | Mar 21, 2024 |
| 144 | Notice of proposed sale | Mar 21, 2024 | — |
| 4 | Insider transaction | Mar 18, 2024 | Mar 15, 2024 |
| 4 | Insider transaction | Mar 14, 2024 | Mar 13, 2024 |
| 4 | Insider transaction | Mar 11, 2024 | Mar 7, 2024 |
| 4 | Insider transaction | Mar 11, 2024 | Mar 8, 2024 |
| 144 | Notice of proposed sale | Mar 8, 2024 | — |
| 4 | Insider transaction | Mar 7, 2024 | Mar 6, 2024 |
| 144 | Notice of proposed sale | Mar 5, 2024 | — |
| 144 | Notice of proposed sale | Feb 29, 2024 | — |
| 4 | Insider transaction | Feb 28, 2024 | Feb 26, 2024 |
| 144 | Notice of proposed sale | Feb 23, 2024 | — |
| 4 | Insider transaction | Feb 21, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 21, 2024 | Feb 16, 2024 |
| 4/A | Filing | Feb 20, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 16, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 16, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| 4 | Insider transaction | Dec 1, 2023 | Nov 30, 2023 |
| 144 | Notice of proposed sale | Nov 30, 2023 | — |
| 4 | Insider transaction | Nov 17, 2023 | Nov 15, 2023 |
| 144 | Notice of proposed sale | Nov 14, 2023 | — |
| 4/A | Form 4/a submission | Sep 15, 2023 | Feb 15, 2022 |
| 4 | Insider transaction | Sep 1, 2023 | Aug 31, 2023 |
| 4 | Insider transaction | Sep 1, 2023 | Aug 31, 2023 |
| 4 | Insider transaction | Sep 1, 2023 | Aug 31, 2023 |
| 4 | Insider transaction | Sep 1, 2023 | Aug 31, 2023 |
| 4 | Insider transaction | Aug 31, 2023 | Aug 30, 2023 |
| 4 | Insider transaction | Aug 31, 2023 | Aug 30, 2023 |
| 4 | Insider transaction | Aug 31, 2023 | Aug 30, 2023 |
| 4 | Insider transaction | Aug 31, 2023 | Aug 30, 2023 |
| 144 | Notice of proposed sale | Aug 30, 2023 | — |
| 144 | Notice of proposed sale | Aug 30, 2023 | — |
| 144 | Notice of proposed sale | Aug 30, 2023 | — |
| 4 | Insider transaction | Aug 30, 2023 | Aug 29, 2023 |
| 4 | Insider transaction | Aug 30, 2023 | Aug 29, 2023 |
| 144 | Notice of proposed sale | Aug 29, 2023 | — |
| 4 | Insider transaction | Aug 24, 2023 | Aug 23, 2023 |
| 144 | Notice of proposed sale | Aug 23, 2023 | — |
| 4 | Insider transaction | Aug 15, 2023 | Aug 13, 2023 |
| 4 | Insider transaction | Aug 14, 2023 | Aug 11, 2023 |
| 4 | Insider transaction | Aug 14, 2023 | Aug 11, 2023 |
| 4 | Insider transaction | Aug 14, 2023 | Aug 11, 2023 |
| 4 | Insider transaction | Aug 14, 2023 | Aug 11, 2023 |
| 4 | Insider transaction | Aug 14, 2023 | Aug 11, 2023 |
| 4 | Insider transaction | Aug 14, 2023 | Aug 11, 2023 |
| 4 | Insider transaction | Aug 14, 2023 | Aug 11, 2023 |
| 4 | Insider transaction | Aug 14, 2023 | Aug 11, 2023 |
| 4 | Insider transaction | Aug 14, 2023 | Aug 11, 2023 |
| 4 | Insider transaction | Aug 9, 2023 | Aug 7, 2023 |
| 144 | Notice of proposed sale | Aug 7, 2023 | — |
| 144 | Notice of proposed sale | Aug 7, 2023 | — |
| 4 | Insider transaction | May 22, 2023 | May 19, 2023 |
| 144 | Notice of proposed sale | May 19, 2023 | — |
| 4 | Insider transaction | May 16, 2023 | May 12, 2023 |
| 4 | Insider transaction | May 16, 2023 | May 12, 2023 |
| 4 | Insider transaction | May 16, 2023 | May 12, 2023 |
| 4 | Insider transaction | May 16, 2023 | May 12, 2023 |
| 4 | Insider transaction | May 15, 2023 | May 12, 2023 |
| 4 | Insider transaction | May 15, 2023 | May 12, 2023 |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Industrial Organic Chemicals (SIC 2860)
- Listed as
- WLK (NYSE)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Houston, TX
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1262823
- Former names
- WESTLAKE CHEMICAL CORP (until Feb 1, 2022)
Other Industrial Organic Chemicals companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.