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 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.
Walker & Dunlop insider sale reported by Mark Bender. The filing discloses two open-market dispositions: 445 common shares sold on 02/20/2026 for $41,874.14 and 1,209 common shares sold on 02/18/2026 for $119,630.55.
The filing also lists various issuer-granted equity awards and option exercises with grant dates and share counts as background; those amounts are presented in the excerpt but are context for the reporting of the dispositions.
Westlake Corporation provides a detailed annual overview of its global chemicals and building-products operations, organized into Housing and Infrastructure Products (HIP) and Performance and Essential Materials (PEM).
The company reports HIP brands spanning siding, roofing, windows, pipe, fittings and PVC compounds, largely supplied by its own PVC production. PEM includes ethylene, polyethylene, chlor-alkali, PVC and epoxy, with approximately 39.2 billion pounds per year of production capacity across North America, Europe and Asia as of February 18, 2026.
Westlake highlights sustainability and environmental spending, with $49 million of 2025 capital expenditures for environmental compliance and planned $103 million in 2026 and $125 million in 2027. It notes market, trade, energy, climate and regulatory risks, as well as plant closures and expansions, and emphasizes a workforce of about 14,600 employees worldwide. The aggregate market value of voting stock held by non‑affiliates was about $2.5 billion on June 30, 2025, with 127,910,338 common shares outstanding as of February 18, 2026.
Westlake Corporation reported weak fourth-quarter and full-year 2025 results heavily affected by restructuring and shutdown charges. In the fourth quarter, net sales were $2.5 billion with a net loss of $544 million, or $4.22 per share, and EBITDA of negative $315 million. Identified shutdown and restructuring items totaling $511 million drove most of the loss; excluding these, the quarter showed a net loss of $33 million, or $0.25 per share, and EBITDA of $196 million.
For 2025, net sales were $11.2 billion and Westlake recorded a net loss of $1.508 billion versus net income of $602 million in 2024, including a $727 million goodwill write-off and other shutdown-related charges. On an adjusted basis excluding Identified Items, the full-year net loss was $116 million and EBITDA was $1.1 billion, down sharply from $2.3 billion in 2024, mainly due to lower prices and volumes and higher feedstock and energy costs.
The Housing and Infrastructure Products segment remained profitable with 2025 EBITDA of $839 million, while Performance and Essential Materials generated a full-year operating loss of $724 million even before Identified Items. Management highlighted a three‑pillar profitability improvement plan—footprint optimization, structural cost savings, and improved plant reliability—targeting a $600 million EBITDA uplift in 2026. The company achieved $170 million of cost savings in 2025 and ended the year with $2.9 billion of cash and securities and $5.6 billion of total debt.
Patel Bhavesh V. reported acquisition or exercise transactions in this Form 4 filing.
Westlake Corp director Bhavesh V. Patel received a grant of 1,852 restricted stock units. These units were awarded at a price of $0.00 per unit and each unit represents the right to receive one share of Westlake common stock. All 1,852 restricted stock units will vest on February 20, 2027, meaning the shares are delivered only if the vesting conditions are met. After this award, Patel directly holds 1,852 restricted stock units.
Westlake Corp director Bhavesh V. Patel filed an initial Form 3, which is a baseline disclosure of his status as a director and any reportable holdings when he became subject to insider reporting rules. This filing does not list any buy or sell transactions.
Westlake Corporation announced that Executive Vice President and Chief Financial Officer M. Steven Bender plans to retire, with his departure effective when a successor is appointed. This signals an upcoming leadership transition in the company’s finance organization.
The board of directors was expanded to fourteen members and elected Bhavesh V. “Bob” Patel and President and CEO Jean-Marc Gilson as directors effective February 20, 2026. Patel will serve as a Class III director through the 2028 annual meeting and is expected to join multiple board committees. He will receive restricted stock units with a grant date fair value of $175,000 that vest on February 20, 2027. Gilson will serve as a Class I director through the 2026 annual meeting and will not receive additional compensation for his board service. The company also furnished a press release describing these board appointments.