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 Scott Thomas Szwejbka reported equity award activity involving restricted stock units and common shares. On February 17, 2026, 977 restricted stock units vested and were converted on a one-for-one basis into 977 shares of common stock. On February 18, 2026, 295 of those shares were withheld at a reference price of $98.95 per share to cover tax obligations arising from the RSU vesting. After these transactions, Szwejbka directly owned 13,499 shares of Westlake common stock.
Westlake Corp vice president and chief accounting officer Jeffrey Adam Holy reported routine equity award activity. On February 17, 706 restricted stock units granted in 2023 vested and converted into 706 shares of common stock on a one-for-one basis, increasing his direct holdings. On February 18, 213 of those shares, valued at $98.95 per share, were withheld to cover tax obligations arising from the RSU vesting, leaving him with 4,941 shares of common stock held directly.
Westlake Corp executive reports RSU vesting and related share movements. EVP, Legal & External Affairs L. Benjamin Ederington exercised 3,809 restricted stock units, which converted into an equal number of Westlake common shares. These RSUs were originally granted in 2023 and vested on the third anniversary of the grant.
To cover tax obligations from the RSU vesting, 978 common shares otherwise issuable were withheld through a tax-withholding disposition, rather than an open-market sale. After these transactions, Ederington directly holds 79,090 shares of Westlake common stock.
Westlake Corp Senior Chairman James Chao reported equity award activity and related tax withholding. On February 17, 2026, 10,382 restricted stock units converted on a one-for-one basis into 10,382 shares of common stock at a stated price of $0.00 per share, reflecting vesting of RSUs granted on February 17, 2023.
On February 18, 2026, 2,664 common shares were disposed of at $98.95 per share to satisfy tax obligations arising from the RSU vesting, rather than through an open-market sale. After these transactions, Chao directly held 47,459 shares of Westlake common stock.
Westlake Corp director John Tsung-chen Chao reported equity compensation activity involving restricted stock units and common stock. On February 17, 2026, 570 restricted stock units converted into an equal number of Westlake common shares following a grant made on February 17, 2023 that vested on the third anniversary.
On February 18, 2026, 242 of the shares otherwise issuable were withheld at a price of $98.95 per share to cover tax obligations arising from the RSU vesting. After these transactions and an ownership reconciliation that added 400 previously unreported shares, Chao directly holds 7,766 common shares of Westlake Corp.
WESTLAKE CORP Executive Chairman Albert Chao reported RSU vesting and related share withholding. On February 17, he exercised 16,555 restricted stock units, which convert into common stock on a one-for-one basis, resulting in 16,555 common shares acquired at a stated price of $0.00 per share.
On February 18, 5,089 common shares were disposed of at $98.95 per share to satisfy tax obligations arising from the RSU vesting, rather than through an open-market sale. After these transactions, he directly owned 639,188 shares of Westlake common stock.
Westlake Corp executive Robert F. Buesinger reported equity award activity and related tax withholding. On February 17, 2026, 3,478 restricted stock units were exercised into the same number of common shares at $0.00 per share, reflecting the vesting of RSUs granted on February 17, 2023. Following this conversion, his direct common stock holdings rose to 38,410 shares. On February 18, 2026, 903 common shares valued at $98.95 per share were disposed of to cover tax obligations from the RSU vesting, reducing his direct holdings to 37,507 shares.
Westlake Corp executive Mark Steven Bender reported equity compensation activity involving restricted stock units (RSUs) and common stock. On February 17, 4,751 RSUs converted into an equal number of Westlake common shares at a stated price of
On February 18, 1,209 common shares were disposed of through a tax-withholding transaction at
Westlake Corporation has completed its previously announced acquisition of the global compounding solutions businesses of the ACI/Perplastic Group. The company disclosed the closing through a press release dated January 5, 2026, which is furnished as Exhibit 99.1 under a Regulation FD disclosure. This step confirms that the transaction has moved from agreement to completion.
The furnished press release is not treated as filed for liability purposes under the Exchange Act and is not automatically incorporated into other securities law filings unless specifically identified. No purchase price or financial terms are included in this disclosure.
Westlake Corp’s executive chairman and director reported an option exercise and share sales in the company’s common stock. On 12/22/2025, he exercised an employee stock option to acquire 81,673 shares of common stock at an exercise price of $44.42 per share, increasing his direct holdings.
That same day, he sold shares in several open-market transactions, including 9,711 shares at a weighted average price of $72.818, 30,604 shares at a weighted average price of $73.796, and 521 shares at a weighted average price of $74.443. A portion of the sale proceeds was used to pay the option strike price and related taxes. After these transactions, he directly owned 627,722 shares of Westlake Corp common stock, and the reported option position was reduced to zero.