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 |
|---|---|---|---|
| DEFA14A | Additional proxy material | Apr 2, 2026 | — |
| DEF 14A | Proxy statement | Apr 2, 2026 | May 14, 2026 |
| DEFA14A | Additional proxy material | Mar 28, 2025 | — |
| DEF 14A | Proxy statement | Mar 28, 2025 | May 8, 2025 |
| DEFA14A | Additional proxy material | Mar 29, 2024 | — |
| DEF 14A | Proxy statement | Mar 29, 2024 | May 9, 2024 |
| DEFA14A | Additional proxy material | Mar 31, 2023 | — |
| DEF 14A | Proxy statement | Mar 31, 2023 | — |
| PRE 14A | Preliminary proxy statement | Mar 20, 2023 | — |
| DEFA14A | Additional proxy material | Apr 1, 2022 | — |
| DEF 14A | Proxy statement | Apr 1, 2022 | May 12, 2022 |
| DEFA14A | Additional proxy material | Apr 2, 2021 | — |
| DEF 14A | Proxy statement | Apr 2, 2021 | May 13, 2021 |
| PRE 14A | Preliminary proxy statement | Mar 5, 2021 | May 13, 2021 |
| DEFA14A | Additional proxy material | Apr 3, 2020 | — |
| DEF 14A | Proxy statement | Apr 3, 2020 | May 15, 2020 |
| DEFA14A | Additional proxy material | Apr 5, 2019 | — |
| DEF 14A | Proxy statement | Apr 5, 2019 | May 17, 2019 |
| DEFA14A | Additional proxy material | Apr 6, 2018 | — |
| DEF 14A | Proxy statement | Apr 6, 2018 | May 18, 2018 |
| DEFA14A | Additional proxy material | Apr 7, 2017 | — |
| DEF 14A | Proxy statement | Apr 7, 2017 | May 19, 2017 |
| PRE 14A | Preliminary proxy statement | Mar 9, 2017 | May 19, 2017 |
| DEFA14A | Additional proxy material | Mar 31, 2016 | — |
| DEF 14A | Proxy statement | Mar 31, 2016 | May 10, 2016 |
| DEFA14A | Additional proxy material | Apr 1, 2015 | — |
| DEFA14A | Additional proxy material | Apr 1, 2015 | — |
| DEF 14A | Proxy statement | Apr 1, 2015 | May 15, 2015 |
Showing 28 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.