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 |
|---|---|---|---|
| CERT | Nyse texas certification | Aug 21, 2026 | — |
| 8-A12B | Filing | Aug 21, 2026 | — |
| SD | Specialized disclosure (conflict minerals) | May 18, 2026 | — |
| SD | Specialized disclosure (conflict minerals) | May 23, 2025 | — |
| UPLOAD | Letter from the SEC | Sep 6, 2024 | — |
| CORRESP | Letter to the SEC | Aug 22, 2024 | — |
| UPLOAD | Letter from the SEC | Aug 9, 2024 | — |
| SD | Specialized disclosure (conflict minerals) | May 22, 2024 | — |
| PX14A6G | Filing | Apr 11, 2024 | — |
| SD | Specialized disclosure (conflict minerals) | May 31, 2023 | — |
| PX14A6G | Filing | Apr 20, 2023 | — |
| SD | Specialized disclosure (conflict minerals) | May 16, 2022 | — |
| UPLOAD | Letter from the SEC | Sep 23, 2021 | — |
| CORRESP | Letter to the SEC | Sep 23, 2021 | — |
| UPLOAD | Letter from the SEC | Sep 20, 2021 | — |
| SD | Specialized disclosure (conflict minerals) | May 21, 2021 | — |
| SD | Specialized disclosure (conflict minerals) | May 22, 2020 | — |
| CERT | Nyse certification | Jul 22, 2019 | — |
| 8-A12B | Filing | Jul 17, 2019 | — |
| SD | Specialized disclosure (conflict minerals) | May 24, 2019 | — |
| POSASR | Filing | Sep 20, 2018 | — |
| SD | Specialized disclosure (conflict minerals) | May 22, 2018 | — |
| SD | Specialized disclosure (conflict minerals) | May 31, 2017 | — |
| POSASR | Filing | Apr 10, 2017 | — |
| EFFECT | Filing | Mar 27, 2017 | — |
| CORRESP | Letter to the SEC | Mar 22, 2017 | — |
| UPLOAD | Letter from the SEC | Mar 21, 2017 | — |
| CORRESP | Letter to the SEC | Mar 15, 2017 | — |
| DFAN14A | 8-k | Jun 30, 2016 | — |
| DFAN14A | Filing | Jun 10, 2016 | — |
| SD | Specialized disclosure (conflict minerals) | May 31, 2016 | — |
| 425 | Filing | May 24, 2016 | — |
| DFAN14A | Filing | May 24, 2016 | — |
| 425 | Filing | May 23, 2016 | — |
| DFAN14A | Filing | May 23, 2016 | — |
| DFRN14A | Filing | May 4, 2016 | — |
| DFAN14A | Filing | May 4, 2016 | — |
| 425 | Filing | May 4, 2016 | — |
| DFRN14A | Filing | May 4, 2016 | — |
| DFAN14A | Filing | May 3, 2016 | — |
| 425 | Filing | May 3, 2016 | — |
| 425 | Filing | Apr 25, 2016 | — |
| DFAN14A | Filing | Apr 25, 2016 | — |
| 425 | Filing | Apr 25, 2016 | — |
| DFAN14A | Filing | Apr 25, 2016 | — |
| DFAN14A | Filing | Apr 25, 2016 | — |
| 425 | Filing | Apr 25, 2016 | — |
| DEFC14A | Filing | Apr 25, 2016 | — |
| PRRN14A | Filing | Apr 18, 2016 | — |
| CORRESP | Letter to the SEC | Apr 18, 2016 | — |
| 425 | Filing | Apr 4, 2016 | — |
| 425 | Filing | Apr 4, 2016 | — |
| 425 | Filing | Apr 4, 2016 | — |
| PREC14A | Filing | Apr 4, 2016 | — |
| 425 | Filing | Apr 4, 2016 | — |
| 425 | Filing | Mar 7, 2016 | — |
| 425 | Filing | Feb 23, 2016 | — |
| 425 | Filing | Feb 16, 2016 | — |
| 425 | Filing | Feb 16, 2016 | — |
| 425 | Form 8-k | Feb 16, 2016 | — |
| 425 | Filing | Jan 29, 2016 | — |
| 425 | Filing | Jan 29, 2016 | — |
| 425 | Filing | Jan 29, 2016 | — |
| 425 | 8-k | Jan 29, 2016 | — |
| SD | Specialized disclosure (conflict minerals) | Jun 1, 2015 | — |
Showing 65 filings. 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.