Welcome to our dedicated page for WESTLAKE CORPORATION SEC filings (Ticker: WLK), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
The Westlake Corporation (NYSE: WLK) SEC filings page on Stock Titan provides direct access to the company’s regulatory disclosures, including current reports on Form 8-K and other key documents filed with the U.S. Securities and Exchange Commission. Westlake is a Houston-headquartered global manufacturer and supplier of materials and products serving housing and construction, packaging, healthcare, automotive and consumer goods, and its filings offer detailed insight into these activities.
Recent Form 8-K filings describe a range of material events. These include the announcement and completion of Westlake’s acquisition of the global compounding solutions businesses of the ACI/Perplastic Group, which expands Westlake Global Compounds’ presence in specialty materials for the wire and cable sectors and extends its manufacturing footprint into Portugal, Romania and Tunisia. Other 8-Ks outline an underwriting agreement and the issuance of senior notes due 2035 and 2055, the commencement and pricing of a cash tender offer for 3.600% senior notes due 2026, and the results of that tender offer.
Filings also cover operational decisions, such as an 8-K reporting a plan to cease operation of certain North American chlorovinyl production facilities and a styrene plant at Lake Charles, Louisiana, while continuing to supply PVC, VCM and chlor-alkali products from seven other North American chlorovinyl facilities. Additional 8-Ks furnish quarterly earnings press releases, investor presentations and dividend announcements.
On Stock Titan, these SEC filings are paired with AI-powered summaries that explain the core points of each document in plain language. Users can quickly understand the significance of a tender offer, a new debt issuance, an acquisition closing or a capacity rationalization without reading every page. The filings page updates as new documents are posted to EDGAR, helping investors follow Westlake’s material events, financing activities and strategic moves through its official disclosures.
Westlake Corp senior vice president Brian John Powers filed an initial ownership report showing equity-based compensation in the form of restricted stock units and stock options tied to common stock. He holds RSUs for 5,645 and 882 underlying shares that vest between 2028 and 2030, plus 3,233 stock options at $94.48 per share expiring in 2036, vesting in three annual installments starting in 2027.
Westlake Corporation announced a leadership transition in its Performance & Essential Materials segment. Robert F. Buesinger, currently Executive Vice President and Segment Head, will move to the role of Special Advisor to the President, effective April 2, 2026.
On the same date, the Board appointed Brian Powers as Senior Vice President, Performance & Essential Materials Segment Head. This change reflects planned succession around Mr. Buesinger’s upcoming retirement and keeps him involved in an advisory capacity to support continuity.
Westlake Corporation has issued its proxy statement for the annual stockholder meeting on May 14, 2026 in Houston. Stockholders of record on March 16, 2026, when 128,083,490 common shares were outstanding, may vote on director elections, executive pay on an advisory basis, and auditor ratification.
The company is a New York Stock Exchange "controlled company" because TTWF LP holds 72.5% of the common stock, and uses related governance exemptions while maintaining fully independent audit, compensation, and nominating committees. The filing outlines board structure, committee responsibilities, cybersecurity and sustainability oversight, and director compensation, including cash retainers and restricted stock units.
The proxy also describes executive pay philosophy, heavy use of performance-based incentives tied to economic value added and total shareholder return, 2025 bonuses under the Annual Incentive Plan and Quarterly Incentive Plan, and 2026 target salary, bonus, and long-term incentive levels for key executives.
Westlake Corp executive vice president Robert F. Buesinger sold 4,000 shares of Common Stock in an open-market transaction at $115.25 per share. Following this sale, he holds 34,482 Westlake shares directly.
Morgan Stanley Smith Barney LLC filed a Form 144 notice for proposed sales of Common stock totaling 4,000 shares. The filing lists an aggregate value of $461,000.00 and cites 127,910,338 shares outstanding as of 03/30/2026. The filing also records recent dispositions by Robert Buesinger: 903 shares sold on 02/18/2026 for $89,351.85 and 326 shares sold on 02/20/2026 for $30,676.97. The securities identified for sale include 890 performance shares (02/19/2024) and 3,110 restricted stock units (08/13/2024).
Westlake Corp EVP & CFO Mark Steven Bender reported an open-market sale of 16,413 shares of Westlake common stock on March 27, 2026. The shares were sold at a weighted average price of $112.535, with individual trade prices ranging from $112.33 to $112.99. After this transaction, he directly holds 28,015 shares of Westlake common stock.
Mark Bender reports dispositions of Common stock, selling 30,102 shares on 02/27/2026 for $3,003,393.25, 1,209 shares on 02/18/2026 for $119,630.55, and 445 shares on 02/20/2026 for $41,874.14.
The filing also lists awards eligible for sale including restricted stock and performance shares granted on 02/17/2020, 02/14/2021, 02/18/2022, 02/19/2024, and 02/18/2025 with listed share counts.
Westlake Corp executive vice president and CFO Mark Steven Bender reported a tax-related share disposition. On February 16, 2022, 1,171 shares of common stock were sold at $104.96 per share to cover tax withholding obligations arising from the vesting of his restricted stock units. After this transaction, he held 25,608 common shares directly. The amended Form 4 corrects the previously reported number of shares sold to cover these tax obligations and is stated to be in addition to, and not a replacement for, the original Form 4.
Westlake Corp EVP & CFO Mark Steven Bender reported multiple equity transactions dated February 27, 2026. He exercised two employee stock options for 6,199 and 6,494 shares, converting them into common stock at exercise prices of $65.8125 and $86.5379 per share.
On the same date, he disposed of 12,693 common shares to the issuer at $98.20 per share and completed open-market sales of 16,988 shares at a weighted average price of $100.91 and 421 shares at $101.515 per share. Following these transactions, he directly owned 44,433 common shares.