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 |
|---|---|---|---|
| 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 |
| 8-K |
Current report
Officer or director change
|
Aug 31, 2026 | Aug 31, 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 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 15, 2026 | Jun 15, 2026 |
| 8-K |
Current report
Shareholder vote results
|
May 18, 2026 | May 14, 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 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Apr 6, 2026 | Apr 2, 2026 |
| 8-K |
Current report
Officer or director change
|
Apr 2, 2026 | Mar 30, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 24, 2026 | Feb 24, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Feb 23, 2026 | Feb 19, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 6, 2026 | Jan 6, 2026 |
| 8-K |
Current report
Exit or restructuring costs, Regulation FD disclosure
|
Dec 15, 2025 | Dec 12, 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 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 4, 2025 | Nov 4, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Oct 30, 2025 | Oct 30, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 26, 2025 | Aug 26, 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 |
| 8-K |
Current report
Shareholder vote results
|
May 12, 2025 | May 8, 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 |
| 8-K |
Current report
Officer or director change
|
Mar 4, 2025 | Feb 28, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 24, 2025 | Feb 24, 2025 |
| 8-K |
Current report
Officer or director change
|
Dec 11, 2024 | Dec 10, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 5, 2024 | Nov 5, 2024 |
| 8-K |
Current report
Officer or director change
|
Aug 12, 2024 | Aug 8, 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 |
| 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 |
| 8-K |
Current report
Shareholder vote results
|
May 13, 2024 | May 9, 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 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 3, 2024 | Apr 3, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 20, 2024 | Feb 20, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 6, 2024 | Feb 6, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 2, 2023 | Nov 2, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 3, 2023 | Aug 3, 2023 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change, Shareholder vote results
|
May 16, 2023 | May 11, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 4, 2023 | May 4, 2023 |
| 8-K |
Current report
Officer or director change
|
Apr 5, 2023 | Apr 3, 2023 |
| 8-K |
Current report
Officer or director change
|
Feb 21, 2023 | Feb 16, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 21, 2023 | Feb 21, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 3, 2022 | Nov 3, 2022 |
| 8-K |
Current report
Other events
|
Aug 15, 2022 | Aug 12, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 2, 2022 | Aug 2, 2022 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Jun 9, 2022 | Jun 9, 2022 |
| 8-K |
Current report
Shareholder vote results
|
May 13, 2022 | May 12, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 3, 2022 | May 3, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 22, 2022 | Feb 22, 2022 |
| 8-K |
Current report
Bylaw or fiscal year change, Regulation FD disclosure
|
Feb 18, 2022 | Feb 18, 2022 |
| 8-K |
Current report
Acquisition or sale of assets, Regulation FD disclosure
|
Feb 1, 2022 | Feb 1, 2022 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Nov 24, 2021 | Nov 24, 2021 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 2, 2021 | Nov 2, 2021 |
| 8-K |
Current report
Acquisition or sale of assets, Regulation FD disclosure
|
Oct 1, 2021 | Oct 1, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 19, 2021 | Aug 19, 2021 |
| 8-K |
Current report
Material agreement, New debt
|
Aug 19, 2021 | Aug 19, 2021 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Aug 6, 2021 | Aug 5, 2021 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 3, 2021 | Aug 3, 2021 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jul 6, 2021 | Jul 4, 2021 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Jun 21, 2021 | Jun 20, 2021 |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
May 17, 2021 | May 13, 2021 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 4, 2021 | May 4, 2021 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 23, 2021 | Feb 23, 2021 |
| 8-K |
Current report
Officer or director change
|
Nov 18, 2020 | Nov 18, 2020 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 3, 2020 | Nov 3, 2020 |
| 8-K |
Current report
Other events
|
Sep 21, 2020 | Sep 21, 2020 |
| 8-K |
Current report
Other events
|
Sep 8, 2020 | Sep 8, 2020 |
| 8-K |
Current report
Other events
|
Aug 28, 2020 | Aug 27, 2020 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 6, 2020 | Aug 6, 2020 |
| 8-K |
Current report
Other events
|
Jul 14, 2020 | Jul 14, 2020 |
| 8-K |
Current report
Material agreement, New debt
|
Jun 12, 2020 | Jun 12, 2020 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Jun 10, 2020 | Jun 9, 2020 |
| 8-K |
Current report
Other events
|
Jun 4, 2020 | Jun 4, 2020 |
| 8-K |
Current report
Shareholder vote results
|
May 18, 2020 | May 15, 2020 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 4, 2020 | May 4, 2020 |
| 8-K |
Current report
Other events
|
Mar 20, 2020 | Mar 20, 2020 |
| 8-K |
Current report
Officer or director change
|
Feb 18, 2020 | Feb 13, 2020 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 18, 2020 | Feb 18, 2020 |
| 8-K |
Current report
Officer or director change
|
Jan 31, 2020 | Jan 27, 2020 |
| 8-K |
Current report
Other events
|
Nov 18, 2019 | Nov 12, 2019 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 5, 2019 | Nov 5, 2019 |
| 8-K |
Current report
Other events
|
Oct 30, 2019 | Oct 29, 2019 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 6, 2019 | Aug 6, 2019 |
| 8-K |
Current report
Material agreement, New debt
|
Jul 17, 2019 | Jul 17, 2019 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Jul 11, 2019 | Jul 10, 2019 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 10, 2019 | Jul 10, 2019 |
| 8-K |
Current report
Results of operations
|
Jul 1, 2019 | Jul 1, 2019 |
| 8-K |
Current report
Shareholder vote results
|
May 21, 2019 | May 17, 2019 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 2, 2019 | May 2, 2019 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 19, 2019 | Feb 19, 2019 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 2, 2019 | Jan 2, 2019 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 6, 2018 | Nov 6, 2018 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 25, 2018 | Sep 25, 2018 |
| 8-K |
Current report
Officer or director change
|
Aug 17, 2018 | Aug 17, 2018 |
| 8-K |
Current report
Other events
|
Aug 17, 2018 | Aug 17, 2018 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 2, 2018 | Aug 2, 2018 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Jul 26, 2018 | Jul 24, 2018 |
| 8-K |
Current report
Shareholder vote results
|
May 21, 2018 | May 18, 2018 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 3, 2018 | May 3, 2018 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 20, 2018 | Feb 20, 2018 |
| 8-K |
Current report
Officer or director change
|
Jan 8, 2018 | Jan 5, 2018 |
| 8-K |
Current report
Material agreement, New debt
|
Nov 28, 2017 | Nov 28, 2017 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Nov 14, 2017 | Nov 13, 2017 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 13, 2017 | Nov 13, 2017 |
| 8-K | Current report | Nov 13, 2017 | Nov 13, 2017 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 7, 2017 | Nov 7, 2017 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 3, 2017 | Aug 3, 2017 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change, Shareholder vote results
|
May 19, 2017 | May 19, 2017 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 2, 2017 | May 2, 2017 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 21, 2017 | Feb 21, 2017 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 24, 2017 | Jan 24, 2017 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 23, 2017 | Jan 23, 2017 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 20, 2017 | Jan 20, 2017 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 8, 2016 | Nov 8, 2016 |
| 8-K/A | Amended current report | Sep 8, 2016 | Aug 31, 2016 |
| 8-K |
Current report
Material agreement, New debt
|
Sep 7, 2016 | Sep 7, 2016 |
| 8-K |
Current report
Other events
|
Sep 6, 2016 | Sep 6, 2016 |
| 8-K |
Current report
Acquisition or sale of assets, New debt, Other events
|
Aug 31, 2016 | Aug 31, 2016 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt, Other events
|
Aug 24, 2016 | Aug 23, 2016 |
| 8-K |
Current report
Other events
|
Aug 22, 2016 | Aug 22, 2016 |
| 8-K |
Current report
Material agreement, New debt
|
Aug 10, 2016 | Aug 10, 2016 |
| 8-K |
Current report
Other events
|
Aug 8, 2016 | Aug 8, 2016 |
| 8-K |
Current report
Other events
|
Aug 3, 2016 | Aug 3, 2016 |
| 8-K |
Current report
Other events
|
Aug 3, 2016 | Aug 3, 2016 |
| 8-K |
Current report
Other events
|
Aug 3, 2016 | Aug 3, 2016 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 28, 2016 | Jul 28, 2016 |
| 8-K |
Current report
Other events
|
Jun 30, 2016 | Jun 30, 2016 |
| 8-K |
Current report
Material agreement
|
Jun 14, 2016 | Jun 10, 2016 |
| 8-K |
Current report
Other events
|
Jun 10, 2016 | Jun 10, 2016 |
| 8-K |
Current report
Shareholder vote results
|
May 11, 2016 | May 10, 2016 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 3, 2016 | May 3, 2016 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 23, 2016 | Feb 23, 2016 |
| 8-K |
Current report
Other events
|
Feb 16, 2016 | Feb 16, 2016 |
| 8-K |
Current report
Other events
|
Jan 29, 2016 | Jan 29, 2016 |
| 8-K |
Current report
Officer or director change
|
Dec 17, 2015 | Dec 17, 2015 |
| 8-K |
Current report
Other events
|
Nov 24, 2015 | Nov 20, 2015 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 3, 2015 | Nov 3, 2015 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 4, 2015 | Aug 4, 2015 |
| 8-K |
Current report
Shareholder vote results
|
May 18, 2015 | May 15, 2015 |
| 8-K |
Current report
Regulation FD disclosure
|
May 6, 2015 | May 5, 2015 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 4, 2015 | May 4, 2015 |
| 8-K |
Current report
Officer or director change
|
Apr 6, 2015 | Apr 1, 2015 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 24, 2015 | Feb 24, 2015 |
Showing 152 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.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
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.