Westlake Chemical Partners LP SEC filings WLKP
Westlake Chemical Partners LP has 420 filings in SEC EDGAR's recent list, going back to Apr 29, 2014. Its latest annual report, Form 10-K, was filed on Mar 4, 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 |
|---|---|---|---|
| 3 | Initial insider ownership | Aug 31, 2026 | Aug 31, 2026 |
| 4 | Insider transaction | Aug 13, 2026 | Aug 12, 2026 |
| 4 | Insider transaction | Aug 13, 2026 | Aug 12, 2026 |
| 4 | Insider transaction | Aug 13, 2026 | Aug 12, 2026 |
| 4 | Insider transaction | Aug 7, 2026 | Aug 6, 2026 |
| 4 | Insider transaction | Aug 7, 2026 | Aug 6, 2026 |
| 4 | Insider transaction | Aug 7, 2026 | Aug 6, 2026 |
| 3 | Initial insider ownership | Jun 15, 2026 | Jun 15, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 17, 2026 | — |
| 4 | Insider transaction | Aug 29, 2025 | Aug 27, 2025 |
| 4 | Insider transaction | Aug 28, 2025 | Nov 27, 2024 |
| 4/A | Filing | Aug 28, 2025 | Aug 28, 2024 |
| 144 | Notice of proposed sale | Aug 15, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 14, 2025 | — |
| 4 | Insider transaction | Aug 8, 2025 | Aug 6, 2025 |
| 4 | Insider transaction | Aug 8, 2025 | Aug 6, 2025 |
| 4 | Insider transaction | Aug 8, 2025 | Aug 6, 2025 |
| 3 | Initial insider ownership | Aug 7, 2025 | Aug 6, 2025 |
| 4 | Insider transaction | May 30, 2025 | May 29, 2025 |
| 4 | Insider transaction | May 29, 2025 | May 27, 2025 |
| 144 | Notice of proposed sale | May 27, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| 4 | Insider transaction | Sep 3, 2024 | Aug 29, 2024 |
| 4 | Insider transaction | Aug 28, 2024 | Aug 26, 2024 |
| 4 | Insider transaction | Aug 26, 2024 | Aug 22, 2024 |
| 4 | Insider transaction | Aug 14, 2024 | Aug 12, 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 8, 2024 | Aug 7, 2024 |
| 4 | Insider transaction | Aug 8, 2024 | Aug 7, 2024 |
| 4 | Insider transaction | Aug 8, 2024 | Aug 7, 2024 |
| 3 | Initial insider ownership | Jul 15, 2024 | Jul 15, 2024 |
| 4 | Insider transaction | Jun 3, 2024 | May 30, 2024 |
| 4 | Insider transaction | May 14, 2024 | May 10, 2024 |
| 4 | Insider transaction | May 13, 2024 | May 10, 2024 |
| 4 | Insider transaction | May 10, 2024 | May 8, 2024 |
| 3 | Initial insider ownership | May 9, 2024 | May 8, 2024 |
| 4 | Insider transaction | Apr 1, 2024 | Mar 28, 2024 |
| 4 | Insider transaction | Mar 25, 2024 | Mar 21, 2024 |
| 4 | Insider transaction | Mar 7, 2024 | Mar 6, 2024 |
| 4 | Insider transaction | Feb 26, 2024 | Feb 22, 2024 |
| SC 13D/A | Amended ownership over 5% (active) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 7, 2024 | — |
| 4 | Insider transaction | Nov 13, 2023 | Nov 9, 2023 |
| 4 | Insider transaction | Nov 8, 2023 | Nov 6, 2023 |
| 4 | Insider transaction | Aug 31, 2023 | Aug 29, 2023 |
| 4 | Insider transaction | Aug 24, 2023 | Aug 22, 2023 |
| 4 | Insider transaction | Aug 23, 2023 | Aug 21, 2023 |
| 4 | Insider transaction | Aug 21, 2023 | Aug 17, 2023 |
| 4 | Insider transaction | Aug 16, 2023 | Aug 15, 2023 |
| 4 | Insider transaction | Aug 11, 2023 | Aug 9, 2023 |
| 4 | Insider transaction | Aug 11, 2023 | Aug 9, 2023 |
| 4 | Insider transaction | Aug 11, 2023 | Aug 9, 2023 |
| 4 | Insider transaction | Aug 11, 2023 | Aug 9, 2023 |
| 4 | Insider transaction | Aug 9, 2023 | Aug 7, 2023 |
| 4 | Insider transaction | May 11, 2023 | May 10, 2023 |
| 3 | Initial insider ownership | Apr 28, 2023 | Apr 27, 2023 |
| 4 | Insider transaction | Mar 14, 2023 | Mar 13, 2023 |
| 4 | Insider transaction | Mar 13, 2023 | Mar 10, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 23, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 11, 2023 | — |
| 4 | Insider transaction | Nov 16, 2022 | Nov 15, 2022 |
| 4 | Insider transaction | Nov 14, 2022 | Nov 10, 2022 |
| 4 | Insider transaction | Aug 12, 2022 | Aug 10, 2022 |
| 4 | Insider transaction | Aug 12, 2022 | Aug 10, 2022 |
| 4 | Insider transaction | Aug 12, 2022 | Aug 10, 2022 |
| 4 | Insider transaction | Jun 13, 2022 | Jun 9, 2022 |
| 4 | Insider transaction | Jun 2, 2022 | May 31, 2022 |
| 144 | Notice of proposed sale | May 31, 2022 | — |
| 4 | Insider transaction | Mar 9, 2022 | Mar 8, 2022 |
| 4 | Insider transaction | Mar 8, 2022 | Mar 7, 2022 |
| 3 | Initial insider ownership | Mar 2, 2022 | Mar 1, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 28, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 21, 2022 | — |
| 4 | Insider transaction | Aug 13, 2021 | Aug 11, 2021 |
| 4 | Insider transaction | Aug 13, 2021 | Aug 11, 2021 |
| 4 | Insider transaction | Aug 13, 2021 | Aug 11, 2021 |
| 4 | Insider transaction | May 14, 2021 | May 14, 2021 |
| 4 | Insider transaction | Mar 8, 2021 | Mar 5, 2021 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 16, 2021 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 16, 2021 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2021 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2021 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 15, 2021 | — |
| SC 13G | Ownership over 5% (passive) | Jan 11, 2021 | — |
| 3 | Initial insider ownership | Jan 4, 2021 | Jan 1, 2021 |
| 4 | Insider transaction | Nov 16, 2020 | Nov 12, 2020 |
| 4 | Insider transaction | Nov 12, 2020 | Nov 11, 2020 |
| 4 | Insider transaction | Aug 17, 2020 | Aug 14, 2020 |
| 4 | Insider transaction | Aug 13, 2020 | Aug 12, 2020 |
| 4 | Insider transaction | Aug 13, 2020 | Aug 12, 2020 |
| 4 | Insider transaction | Aug 13, 2020 | Aug 12, 2020 |
| 4 | Insider transaction | May 15, 2020 | May 14, 2020 |
| 3 | Initial insider ownership | Mar 31, 2020 | Mar 31, 2020 |
| 4 | Insider transaction | Mar 25, 2020 | Mar 24, 2020 |
| 3 | Initial insider ownership | Mar 25, 2020 | Mar 24, 2020 |
| 4 | Insider transaction | Mar 24, 2020 | Mar 23, 2020 |
| 4 | Insider transaction | Mar 23, 2020 | Mar 23, 2020 |
| 4 | Insider transaction | Mar 23, 2020 | Mar 23, 2020 |
| 4 | Insider transaction | Mar 23, 2020 | Mar 20, 2020 |
| 4 | Insider transaction | Mar 20, 2020 | Mar 20, 2020 |
| 4 | Insider transaction | Mar 20, 2020 | Mar 19, 2020 |
| 4 | Insider transaction | Mar 19, 2020 | Mar 18, 2020 |
| 4 | Insider transaction | Mar 18, 2020 | Mar 18, 2020 |
| 4 | Insider transaction | Mar 18, 2020 | Mar 17, 2020 |
| 4 | Insider transaction | Mar 17, 2020 | Mar 16, 2020 |
| 4 | Insider transaction | Mar 16, 2020 | Mar 13, 2020 |
| 4 | Insider transaction | Mar 16, 2020 | Mar 12, 2020 |
| 4 | Insider transaction | Mar 16, 2020 | Mar 12, 2020 |
| 4 | Insider transaction | Mar 12, 2020 | Mar 10, 2020 |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2020 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2020 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2020 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 27, 2020 | — |
| 4 | Insider transaction | Nov 15, 2019 | Nov 15, 2019 |
| 4 | Insider transaction | Nov 14, 2019 | Nov 14, 2019 |
| 4 | Insider transaction | Nov 12, 2019 | Nov 12, 2019 |
| 3 | Initial insider ownership | Nov 12, 2019 | Nov 8, 2019 |
| 4 | Insider transaction | Aug 21, 2019 | Aug 19, 2019 |
| 4 | Insider transaction | Aug 21, 2019 | Aug 19, 2019 |
| 4 | Insider transaction | Aug 16, 2019 | Aug 14, 2019 |
| 4 | Insider transaction | Aug 16, 2019 | Aug 14, 2019 |
| 4 | Insider transaction | Aug 16, 2019 | Aug 14, 2019 |
| SC 13G | Ownership over 5% (passive) | Jun 10, 2019 | — |
| SC 13D | Ownership over 5% (active) | Apr 8, 2019 | — |
| 4 | Insider transaction | Apr 1, 2019 | Mar 29, 2019 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2019 | — |
| SC 13G | Ownership over 5% (passive) | Feb 13, 2019 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2019 | — |
| SC 13G | Ownership over 5% (passive) | Feb 6, 2019 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 10, 2019 | — |
| 4 | Insider transaction | Dec 3, 2018 | Nov 30, 2018 |
| 4 | Insider transaction | Nov 26, 2018 | Nov 26, 2018 |
| 4 | Insider transaction | Nov 20, 2018 | Nov 19, 2018 |
| 4 | Insider transaction | Nov 19, 2018 | Nov 15, 2018 |
| 4 | Insider transaction | Nov 15, 2018 | Nov 13, 2018 |
| 4 | Insider transaction | Nov 14, 2018 | Nov 12, 2018 |
| 4 | Insider transaction | Nov 13, 2018 | Nov 12, 2018 |
| 4 | Insider transaction | Aug 20, 2018 | Aug 16, 2018 |
| 4 | Insider transaction | Aug 20, 2018 | Aug 16, 2018 |
| 4 | Insider transaction | Aug 20, 2018 | Aug 16, 2018 |
| 4 | Insider transaction | Aug 16, 2018 | Aug 15, 2018 |
| 4 | Insider transaction | Aug 16, 2018 | Aug 15, 2018 |
| 4 | Insider transaction | Aug 16, 2018 | Aug 15, 2018 |
| SC 13G | Ownership over 5% (passive) | Apr 3, 2018 | — |
| SC 13D/A | Amended ownership over 5% (active) | Apr 3, 2018 | — |
| SC 13D/A | Amended ownership over 5% (active) | Mar 23, 2018 | — |
| 4 | Insider transaction | Mar 7, 2018 | Mar 6, 2018 |
| 4 | Insider transaction | Mar 6, 2018 | Mar 2, 2018 |
| 4 | Insider transaction | Mar 5, 2018 | Mar 1, 2018 |
| 4 | Insider transaction | Mar 2, 2018 | Mar 1, 2018 |
| 4 | Insider transaction | Feb 27, 2018 | Feb 27, 2018 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2018 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2018 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 5, 2018 | — |
| 4 | Insider transaction | Jan 30, 2018 | Jan 30, 2018 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 26, 2018 | — |
| 4 | Insider transaction | Dec 5, 2017 | Dec 4, 2017 |
| 4 | Insider transaction | Nov 29, 2017 | Nov 28, 2017 |
| 4 | Insider transaction | Nov 28, 2017 | Nov 24, 2017 |
| 4/A | Form 4/a | Nov 28, 2017 | Nov 22, 2017 |
| 4 | Insider transaction | Nov 27, 2017 | Nov 22, 2017 |
| 4 | Insider transaction | Nov 16, 2017 | Aug 7, 2017 |
| 3 | Initial insider ownership | Oct 26, 2017 | Oct 16, 2017 |
| 3 | Initial insider ownership | Oct 26, 2017 | Oct 16, 2017 |
| SC 13D | Ownership over 5% (active) | Oct 26, 2017 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 6, 2017 | — |
| 4 | Insider transaction | Aug 31, 2017 | Aug 30, 2017 |
| 4 | Insider transaction | Aug 21, 2017 | Aug 20, 2017 |
| 4 | Insider transaction | Aug 18, 2017 | Aug 16, 2017 |
| 4 | Insider transaction | Aug 18, 2017 | Aug 16, 2017 |
| 4 | Insider transaction | Aug 18, 2017 | Aug 16, 2017 |
| SC 13G/A | Amended ownership over 5% (passive) | Apr 24, 2017 | — |
| 4 | Insider transaction | Mar 10, 2017 | Mar 9, 2017 |
| 4 | Insider transaction | Mar 9, 2017 | Mar 7, 2017 |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2017 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2017 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2017 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 25, 2017 | — |
| 4 | Insider transaction | Dec 2, 2016 | Nov 30, 2016 |
| 4 | Insider transaction | Nov 17, 2016 | Nov 15, 2016 |
| 3 | Initial insider ownership | Oct 12, 2016 | Oct 7, 2016 |
| 4 | Insider transaction | Aug 23, 2016 | Aug 19, 2016 |
| 4 | Insider transaction | Aug 23, 2016 | Aug 19, 2016 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 16, 2016 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 16, 2016 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2016 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2016 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2016 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 5, 2016 | — |
| SC 13G | Ownership over 5% (passive) | Jan 7, 2016 | — |
| 4 | Insider transaction | Aug 21, 2015 | Aug 19, 2015 |
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
- WLKP (NYSE)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Houston, TX
- SEC filer status
- Accelerated filer
- SEC CIK
- 1604665
Other Industrial Organic Chemicals companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.