Every Form 4 that Westlake Corporation (WLK) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow WLK and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full WLK filings page.
WESTLAKE CORP (symbol: WLK) is the issuer of record for a Form 4 filing submitted to the SEC.
Westlake Corp (WLK) director Jeffrey Wayne Sheets reported a grant of 2,184 Restricted Stock Units. These RSUs convert into Westlake common stock on a one-for-one basis and all are scheduled to vest on August 14, 2027. Following this award, Sheets directly holds 2,184 RSUs, each representing one underlying share of common stock.
WESTLAKE CORP director Carolyn Chao Sabat reported an equity compensation grant of 2,184 Restricted Stock Units. The RSUs were acquired at a stated price of $0.00 per unit as a grant and will convert into an equal number of shares of Common Stock on a one-for-one basis. All of these RSUs are scheduled to vest on August 14, 2027, at which point they will settle in common shares. Following this grant, Sabat holds 2,184 RSUs directly.
WESTLAKE CORP director Bhavesh V. Patel received a grant of 2,184 Restricted Stock Units on August 14, 2026. The RSUs convert into an equal number of shares of common stock on a one-for-one basis and will vest on August 14, 2027. Following this award, Patel holds 2,184 RSUs directly.
WESTLAKE CORP (WLK) director R Bruce Northcutt received a grant of 2,184 Restricted Stock Units. These RSUs convert into an equal number of the company’s common shares on a one-for-one basis and will fully vest on August 14, 2027, increasing his directly held equity-based compensation.
WESTLAKE CORP director Mark A. McCollum reported an equity compensation award of 2,184 Restricted Stock Units on August 14, 2026. These RSUs convert into an equal number of shares of common stock on a one-for-one basis and will fully vest on August 14, 2027. Following this grant, he holds 2,184 RSUs directly.
Lubel Kimberly S reported acquisition or exercise transactions in this Form 4 filing.
WESTLAKE CORP director Kimberly S. Lubel received a grant of 2,184 Restricted Stock Units representing an equivalent number of shares of common stock. These RSUs were awarded at $0.00 per unit and will vest on August 14, 2027. Following this grant, she holds 2,184 RSUs directly.
Graff Michael J reported acquisition or exercise transactions in this Form 4 filing.
WESTLAKE CORP (WLK) director Michael J. Graff reported a compensation-related equity award. He received 2,184 Restricted Stock Units, each convertible into one share of the company’s common stock. All of these units are scheduled to vest on August 14, 2027, and his directly held RSU balance reported after the award is 2,184 units.
CREGG ROGER A reported acquisition or exercise transactions in this Form 4 filing.
WESTLAKE CORP director Roger A. Cregg received a grant of 2,184 Restricted Stock Units that are settled in the company’s common stock on a one-for-one basis. All of these RSUs will vest on August 14, 2027, and his directly held RSU balance after this grant is 2,184 units.
Westlake Corp (WLK) director David Tsung-Hung Chao reported receiving a grant of 2,184 Restricted Stock Units (RSUs) on August 14, 2026. Each RSU converts into one share of Westlake common stock. All 2,184 RSUs are scheduled to vest on August 14, 2027, and the reported holdings after this award total 2,184 RSUs held directly.
Westlake Corp (WLK) director Catherine T. Chao received a grant of 2,184 Restricted Stock Units linked to Westlake common stock. The RSUs convert into common stock on a one-for-one basis and will fully vest on August 14, 2027, bringing her directly held RSU-based position to 2,184 underlying shares.
Westlake Corp Executive Chairman Albert Chao reported an option exercise and related stock sales. He exercised employee stock options for 38,873 shares of common stock at an exercise price of $61.865 per share, then sold 7,489 shares at $79.70 and 31,384 shares at $80.42 per share in open-market transactions on August 11, 2026. The sold shares were executed at weighted average prices within disclosed price ranges.
Westlake Corp director Jeffrey Wayne Sheets reported the vesting and conversion of 2,168 Restricted Stock Units into an equal number of shares of common stock on August 8, 2026. The RSUs, granted on August 8, 2025 and vesting on the first anniversary of the grant date, converted on a one-for-one basis into common shares. Following the transaction, Sheets directly owned 14,927 shares of Westlake common stock.
Westlake Corp director Carolyn Chao Sabat exercised previously granted 2,168 Restricted Stock Units, converting them into 2,168 shares of common stock on a one-for-one basis. The award was originally granted on August 8, 2025 and vested on its first anniversary. Following this conversion, she directly holds 5,748 shares of Westlake common stock.
Westlake Corp director R. Bruce Northcutt reported an option-style event involving restricted stock units. On August 8, 2026, 2,168 restricted stock units were exercised and converted on a one-for-one basis into 2,168 shares of common stock. Following the conversion, Northcutt directly holds 23,351 shares of Westlake common stock. The units had been granted on August 8, 2025 and vested on the first anniversary of the grant date.
Westlake Corp director Mark A. McCollum reported the vesting and conversion of 2,168 restricted stock units into an equal number of shares of common stock on August 8, 2026. The restricted stock units converted to common stock on a one-for-one basis and were originally granted on August 8, 2025, vesting on the first anniversary of the grant date. Following this transaction, McCollum directly holds 11,824 shares of Westlake common stock.
Westlake Corp director Kimberly S. Lubel reported the exercise and conversion of 2,168 restricted stock units into 2,168 shares of common stock on August 8, 2026. Following this transaction, Lubel directly holds 13,821 shares of common stock. The restricted stock units convert into common stock on a one-for-one basis and were originally granted on August 8, 2025, with vesting on the first anniversary of the grant date.
Westlake Corp director Michael J. Graff reported an automatic conversion of 2,168 restricted stock units into common stock on August 8, 2026. The restricted stock units converted into common shares on a one-for-one basis, stemming from a grant made on August 8, 2025 that vested on its first anniversary. Following the conversion, Graff directly held 23,310 shares of Westlake common stock.
Westlake Corp director Roger A. Cregg reported the vesting and exercise of 2,168 restricted stock units into an equal number of shares of common stock on August 8, 2026. Restricted stock units convert into common stock on a one-for-one basis. Following the transaction, Cregg directly holds 3,507 shares of common stock.
WESTLAKE CORP director David Tsung-Hung Chao reported the vesting and conversion of 2,168 restricted stock units into an equal number of common shares on August 8, 2026. Following this exercise, he holds 11,080 common shares directly and 19,423 common shares indirectly through a trust for his benefit, where he serves as sole trustee.
Westlake Corp director Catherine T. Chao reported the vesting and exercise of 2,168 Restricted Stock Units into 2,168 shares of common stock on August 8, 2026. Following this, she holds 7,748 common shares directly and 19,423 common shares indirectly through a trust for her benefit.
Baksht Jonathan reported acquisition or exercise transactions in this Form 4 filing.
Westlake Corp SVP and CFO Jonathan Baksht reported receiving a grant of 20,580 restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of Westlake common stock, and all of these RSUs are scheduled to vest on June 15, 2029.
WESTLAKE CORP EVP & CFO Mark Steven Bender reported routine equity compensation activity. On May 12, 2026, he exercised 13,164 restricted stock units (RSUs), which converted into the company’s common stock on a one-for-one basis, reflecting the vesting of RSUs granted on May 12, 2023.
On May 13, 2026, 5,284 common shares otherwise issuable were withheld to cover tax obligations arising from this vesting, a non-market, tax-withholding disposition. After these transactions, he beneficially owns 35,895 common shares directly.
Westlake Corp senior vice president Brian John Powers reported a compensation-related equity award of 1,961 restricted stock units (RSUs), each representing a contingent right to receive one share of Westlake common stock. All of these RSUs are scheduled to vest on April 2, 2029.
This filing reflects a grant/award acquisition rather than an open-market stock purchase or sale, and leaves Powers with a reported total of 1,961 RSUs following the transaction.
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.
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.
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.
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 SVP Scott Thomas Szwejbka reported several equity compensation transactions. On February 20, 2026, he received an employee stock option grant for 14,595 shares at an exercise price of $0.00 per share and 3,983 restricted stock units, both held directly.
On February 19, 2026, 365 shares of common stock were acquired following the vesting of performance stock units granted on February 17, 2023, after performance criteria were certified. Also on February 20, 2026, 91 shares of common stock were disposed of at $94.10 per share to satisfy tax obligations from the PSU vesting, leaving 13,773 common shares held directly.
Westlake Corp vice president and chief accounting officer Jeffrey Adam Holy reported multiple equity awards and a small tax-related share disposition. On February 20, 2026, he was granted employee stock options covering 4,394 shares and restricted stock units (RSUs) for 1,199 and 2,540 shares, all at a grant price of $0.0000 per share.
According to the filing, the stock options vest in three installments of 33%, 33%, and 34% on February 20, 2027, February 20, 2028, and February 20, 2029, and all RSUs will vest on February 20, 2029. He also acquired 264 shares of common stock on February 19, 2026 upon performance stock unit vesting, while 81 shares were withheld at $94.10 per share to cover tax obligations.
Westlake Corp President and CEO Jean-Marc Gilson reported equity awards consisting of stock options and restricted stock units. He was granted 109,139 employee stock options at an exercise price of $0.00 and 29,784 restricted stock units, each RSU representing the right to receive one share of common stock. The options become exercisable in three installments of 33%, 33% and 34% on February 20, 2027, 2028 and 2029, while all RSUs vest on February 20, 2029.
Westlake Corp executive L. Benjamin Ederington reported equity awards and related tax withholding transactions. On February 20, 2026, he received 25,656 employee stock options at an exercise price of $0.0000 per share. According to the disclosure, these options become exercisable in three installments of 33%, 33% and 34% on February 20, 2027, 2028 and 2029, respectively.
He was also granted 7,002 restricted stock units, each representing a contingent right to receive one share of common stock, which are scheduled to vest on February 20, 2029. In addition, 1,425 shares of common stock were acquired on February 19, 2026 upon the vesting of performance stock units, following the compensation committee’s confirmation that performance criteria were satisfied. To cover tax obligations from this vesting, 357 shares of common stock were disposed of at a weighted-average price of $94.102 per share. After these transactions, he directly owned 80,158 common shares.
Westlake Corp executive Robert F. Buesinger reported multiple equity compensation transactions. On February 20, 2026, he received an employee stock option grant for 19,351 options at an exercise price of $0.00 per share, which become exercisable in three installments of 33%, 33% and 34% on February 20, 2027, 2028 and 2029. He also received 5,281 restricted stock units, each representing one share of common stock, which will fully vest on February 20, 2029.
Separately, on February 19, 2026, 1,301 shares of common stock vested upon satisfaction of performance criteria under performance stock units granted in 2023. To satisfy tax obligations from this vesting, 326 shares of common stock were disposed of at a weighted average price of $94.101 per share in multiple transactions between $94.10 and $94.29, leaving him with 38,482 common shares held directly.
Westlake Corp executive vice president and CFO Mark Steven Bender reported multiple equity compensation transactions. He received a grant of 28,389 employee stock options and 7,747 restricted stock units on February 20, 2026, both held directly.
On February 19, 2026, 1,777 shares of common stock vested after performance criteria were certified for previously granted performance stock units. To cover tax obligations from this vesting, 445 common shares were disposed of at a weighted average price of about $94.10, leaving the CFO with 61,842 common shares directly owned. The stock options vest in three annual installments starting in 2027, and all RSUs vest on February 20, 2029.
Westlake Corp director John Tsung-chen Chao reported multiple equity award transactions. On February 20, 2026, he received an employee stock option for 4,044 shares at an exercise price of $0.00 and two restricted stock unit (RSU) grants covering 1,104 and 2,434 RSUs, each RSU representing one share of common stock, with all RSUs vesting on February 20, 2029. On February 19, 2026, 213 shares of common stock vested upon satisfaction of performance criteria for previously granted performance stock units, and he acquired these shares as a grant. Also on February 20, 2026, 91 shares of common stock were disposed of at $94.10 per share to cover tax obligations related to PSU vesting, leaving him with 7,888 common shares directly owned.
Westlake Corp Executive Chairman Albert Chao reported several equity compensation transactions. He received a grant of 54,763 employee stock options on common shares and 14,945 restricted stock units, both at a grant price of $0.00 per unit. The options become exercisable in three installments of 33%, 33%, and 34% on February 20, 2027, February 20, 2028, and February 20, 2029, respectively, and all RSUs vest on February 20, 2029. He also acquired 6,193 shares of common stock upon vesting of performance stock units tied to performance criteria. To cover tax obligations from this vesting, 2,501 common shares were disposed of at a weighted average price of about $94.10 per share, in multiple transactions within a disclosed price range.
Westlake Corp Senior Chairman James Chao reported multiple equity compensation transactions. He received an employee stock option grant for 27,382 shares and 7,472 restricted stock units, both awarded at no cash cost as part of his compensation.
Performance-based stock units also vested into common shares. This vesting delivered 3,884 shares of common stock, while 1,569 shares were disposed of to satisfy tax obligations at a weighted average price of $94.101 per share. After these transactions, he directly holds 49,774 common shares, plus the newly granted options and RSUs.
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 $0.0000 per share. Following this derivative exercise, his direct common stock holdings increased to 61,719 shares.
On February 18, 1,209 common shares were disposed of through a tax-withholding transaction at $98.95 per share to satisfy tax obligations arising from the RSU vesting, as described in the footnotes. After this withholding, Bender directly holds 60,510 shares of Westlake common stock.
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.
Westlake Corp director reports routine equity award vesting and share acquisition. A board member converted 1,339 restricted stock units into 1,339 shares of Westlake common stock on December 10, 2025, shown as an "M" code transaction. The form reports these shares as directly owned after the transaction.
The restricted stock units were originally granted on December 10, 2024 and vested on the first anniversary of the grant. Each unit converts into one share of common stock at an exercise price of $0, reflecting standard director equity compensation rather than an open-market purchase. The derivative position now shows zero restricted stock units remaining after this vesting and settlement.