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 |
|---|---|---|---|
| 10-Q | Quarterly report | Nov 4, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 4, 2026 | Nov 4, 2026 |
| 8-K |
Current report
Exit or restructuring costs, Regulation FD disclosure
|
Sep 29, 2026 | Sep 24, 2026 |
| 4 | Insider transaction | Sep 1, 2026 | Aug 31, 2026 |
| 3 | Initial insider ownership | Aug 31, 2026 | Aug 31, 2026 |
| 8-K |
Current report
Officer or director change
|
Aug 31, 2026 | Aug 31, 2026 |
| CERT | Nyse texas certification | Aug 21, 2026 | — |
| 8-A12B | Filing | Aug 21, 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 |
| 10-Q | Quarterly report | Aug 5, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 4, 2026 | Aug 4, 2026 |
| 8-K |
Current report
Other events
|
Jul 29, 2026 | Jul 29, 2026 |
| 4 | Insider transaction | Jun 16, 2026 | Jun 15, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 15, 2026 | Jun 15, 2026 |
| 3 | Initial insider ownership | Jun 15, 2026 | Jun 15, 2026 |
| SD | Specialized disclosure (conflict minerals) | May 18, 2026 | — |
| 8-K |
Current report
Shareholder vote results
|
May 18, 2026 | May 14, 2026 |
| 4 | Insider transaction | May 14, 2026 | May 12, 2026 |
| 10-Q | Quarterly report | May 6, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 5, 2026 | May 5, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
May 1, 2026 | Apr 27, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Apr 20, 2026 | Apr 15, 2026 |
| 8-K |
Current report
Other events
|
Apr 14, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 6, 2026 | Apr 2, 2026 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Apr 6, 2026 | Apr 2, 2026 |
| 3 | Initial insider ownership | Apr 2, 2026 | Apr 2, 2026 |
| 8-K |
Current report
Officer or director change
|
Apr 2, 2026 | Mar 30, 2026 |
| ARS | Annual report to shareholders | Apr 2, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 2, 2026 | — |
| DEF 14A | Proxy statement | Apr 2, 2026 | May 14, 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 | — |
| 10-K | Annual report | Feb 26, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 24, 2026 | Feb 24, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 20, 2026 |
| 3 | Initial insider ownership | Feb 23, 2026 | Feb 20, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
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 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 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 6, 2026 | Jan 6, 2026 |
| 4 | Insider transaction | Dec 23, 2025 | Dec 22, 2025 |
| 144 | Notice of proposed sale | Dec 22, 2025 | — |
| 8-K |
Current report
Exit or restructuring costs, Regulation FD disclosure
|
Dec 15, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 10, 2025 | Dec 10, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 12, 2025 | Nov 10, 2025 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Nov 5, 2025 | Nov 4, 2025 |
| 424B5 | Prospectus supplement | Nov 5, 2025 | — |
| FWP | Free writing prospectus | Nov 4, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 4, 2025 | Nov 4, 2025 |
| 424B5 | Prospectus supplement | Nov 4, 2025 | — |
| S-3ASR | Automatic shelf registration | Oct 31, 2025 | — |
| 10-Q | Quarterly report | Oct 31, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Oct 30, 2025 | Oct 30, 2025 |
| 4 | Insider transaction | Oct 3, 2025 | Oct 1, 2025 |
| 4 | Insider transaction | Aug 29, 2025 | Aug 28, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 26, 2025 | Aug 26, 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 |
| 10-Q | Quarterly report | Aug 6, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 5, 2025 | Aug 5, 2025 |
| 8-K |
Current report
Exit or restructuring costs
|
Jun 17, 2025 | Jun 17, 2025 |
| 4 | Insider transaction | Jun 9, 2025 | Apr 22, 2025 |
| SD | Specialized disclosure (conflict minerals) | May 23, 2025 | — |
| 8-K |
Current report
Shareholder vote results
|
May 12, 2025 | May 8, 2025 |
| 10-Q | Quarterly report | May 2, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 2, 2025 | May 2, 2025 |
| 8-K |
Current report
Officer or director change
|
Apr 16, 2025 | Apr 11, 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 |
| ARS | Annual report to shareholders | Mar 28, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Mar 28, 2025 | — |
| DEF 14A | Proxy statement | Mar 28, 2025 | May 8, 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 |
| 8-K |
Current report
Officer or director change
|
Mar 4, 2025 | Feb 28, 2025 |
| 10-K | Annual report | Feb 25, 2025 | Dec 31, 2024 |
| 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 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 24, 2025 | Feb 24, 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 |
| 8-K |
Current report
Officer or director change
|
Dec 11, 2024 | Dec 10, 2024 |
| 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 | — |
| 10-Q | Quarterly report | Nov 6, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 5, 2024 | Nov 5, 2024 |
| UPLOAD | Letter from the SEC | Sep 6, 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 | — |
| CORRESP | Letter to the SEC | Aug 22, 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 |
| 8-K |
Current report
Officer or director change
|
Aug 12, 2024 | Aug 8, 2024 |
| UPLOAD | Letter from the SEC | Aug 9, 2024 | — |
| 10-Q | Quarterly report | Aug 9, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 6, 2024 | Aug 6, 2024 |
| 8-K |
Current report
Exit or restructuring costs
|
Jul 29, 2024 | Jul 29, 2024 |
| 4 | Insider transaction | Jul 16, 2024 | Jul 15, 2024 |
| 3 | Initial insider ownership | Jul 15, 2024 | Jul 15, 2024 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Jul 15, 2024 | Jul 15, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 1, 2024 | Jul 1, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 13, 2024 | Jun 13, 2024 |
| 8-K |
Current report
Officer or director change
|
May 29, 2024 | May 22, 2024 |
| SD | Specialized disclosure (conflict minerals) | May 22, 2024 | — |
| 8-K |
Current report
Shareholder vote results
|
May 13, 2024 | May 9, 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 | — |
| 10-Q | Quarterly report | May 2, 2024 | Mar 31, 2024 |
| 3 | Initial insider ownership | May 2, 2024 | Apr 25, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 1, 2024 | May 1, 2024 |
| 8-K |
Current report
Officer or director change
|
Apr 25, 2024 | Apr 25, 2024 |
| PX14A6G | Filing | Apr 11, 2024 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 3, 2024 | Apr 3, 2024 |
| 4 | Insider transaction | Apr 1, 2024 | Mar 28, 2024 |
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.