Westlake SEC Filings
NYSE: WLKIndustrialsMajor ChemicalsUSD
62.29-0.02 (-0.03%)
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Westlake filing overview
This page lists 60 recent SEC filings by Westlake (WLK), including 39 4, 16 8-K, 2 10-Q, 1 DEF 14A. The latest annual report (10-K) was filed on Feb 26, 2026 for the period ending Dec 31, 2025. The most recent quarterly report (10-Q) was filed on Aug 5, 2026.
The latest current report (8-K), used to disclose material events such as earnings releases and executive changes, was filed on Sep 29, 2026. Form 10-K is the audited annual report, 10-Q the quarterly report, 8-K covers material events, and Form 4 reports insider transactions. All documents link directly to SEC EDGAR.
Summary generated from market data by MetaCap's automated system. Methodology
WLK SEC filings
| Filed | Form | Description | Document |
|---|---|---|---|
| Sep 29, 2026 | 8-K | Costs Associated with Exit or Disposal Activities; Regulation FD Disclosure | View on EDGAR |
| Sep 1, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 31, 2026 | 8-K | Departure or Appointment of Directors or Officers; Compensatory Arrangements | View on EDGAR |
| Aug 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 5, 2026 | 10-Q | Quarterly report | View on EDGAR |
| Aug 4, 2026 | 8-K | Results of Operations and Financial Condition; Regulation FD Disclosure | View on EDGAR |
| Jul 29, 2026 | 8-K | Other Events | View on EDGAR |
| Jun 16, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 15, 2026 | 8-K | Regulation FD Disclosure | View on EDGAR |
| May 18, 2026 | 8-K | Submission of Matters to a Vote of Security Holders | View on EDGAR |
| May 14, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 6, 2026 | 10-Q | Quarterly report | View on EDGAR |
| May 5, 2026 | 8-K | Results of Operations and Financial Condition; Regulation FD Disclosure | View on EDGAR |
| May 1, 2026 | 8-K | Regulation FD Disclosure | View on EDGAR |
| Apr 20, 2026 | 8-K | Departure or Appointment of Directors or Officers; Compensatory Arrangements; Regulation FD Disclosure | View on EDGAR |
| Apr 14, 2026 | 8-K | Other Events | View on EDGAR |
| Apr 6, 2026 | 8-K | Entry into a Material Definitive Agreement; Termination of a Material Definitive Agreement; Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement | View on EDGAR |
| Apr 6, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Apr 2, 2026 | DEF 14A | Definitive proxy statement | View on EDGAR |
| Apr 2, 2026 | 8-K | Departure or Appointment of Directors or Officers; Compensatory Arrangements | View on EDGAR |
| Mar 31, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 30, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 6, 2026 | 4/A | Statement of changes in beneficial ownership (amendment) | View on EDGAR |
| Mar 2, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 26, 2026 | 10-K | Annual report | View on EDGAR |
| Feb 24, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 24, 2026 | 8-K | Results of Operations and Financial Condition; Regulation FD Disclosure | View on EDGAR |
| Feb 23, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 23, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 23, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 23, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 23, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 23, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 23, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 23, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 23, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 23, 2026 | 8-K | Departure or Appointment of Directors or Officers; Compensatory Arrangements; Regulation FD Disclosure | View on EDGAR |
| Feb 19, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 19, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jan 6, 2026 | 8-K | Regulation FD Disclosure | View on EDGAR |
| Dec 15, 2025 | 8-K | Costs Associated with Exit or Disposal Activities; Regulation FD Disclosure | View on EDGAR |