WESTLAKE CORP|4Feb 23, 2:43 PM ET

Buesinger Robert F. 4

4 · WESTLAKE CORP · Filed Feb 23, 2026

AI-generated summary of this filing

Updated Feb 23, 2026

Westlake (WLK) EVP Robert F. Buesinger Receives Awards, Sells 326 Shares

What Happened

Robert F. Buesinger, EVP and PEM Segment Head at Westlake Corp (WLK), had performance stock units (PSUs) vest and sold shares to cover taxes, while also receiving new derivative awards. Specifically, 1,301 shares vested on Feb 19, 2026 (PSUs). On Feb 20, 2026 he disposed of 326 shares (tax withholding/sale) producing proceeds of $30,677 (weighted average price $94.10; sale prices ranged $94.10–$94.29). On Feb 20, 2026 he was also granted derivative awards totaling 24,632 shares (19,351 + 5,281) as new long‑term equity incentives (awarded at $0.00).

Key Details

Transaction dates: PSUs vested 2026-02-19; tax‑withholding sale and new awards on 2026-02-20. Form 4 filed 2026-02-23 (timely).
Sale details: 326 shares sold to satisfy tax withholding; weighted average price $94.10; sales occurred at prices between $94.10 and $94.29; proceeds ≈ $30,677.
Grants: Two derivative awards granted 2026-02-20 totaling 24,632 shares (19,351 and 5,281). These are compensatory awards (stock options and/or RSUs) issued at $0.00.
Vesting/exercise notes: The filing indicates stock options (if applicable) are exercisable in three installments (Feb 20, 2027; Feb 20, 2028; Feb 20, 2029). The RSUs (each convertible to one share) vest on Feb 20, 2029.
Shares owned after transaction: Not specified in the provided filing excerpt.
Filing timeliness: Report filed Feb 23, 2026 for transactions through Feb 20, 2026—within the Form 4 timing requirements (timely).

Context

The 326‑share sale was to satisfy tax withholding on vested PSUs (routine corporate practice) and does not necessarily signal a trading view. The larger new awards are long‑term compensation: RSUs convert to shares at vesting and stock options (if part of the grant) become exercisable over 2027–2029, indicating retention/longer‑term alignment rather than immediate market exposure.

Form 4

Period: 2026-02-19

EVP, PEM Segment Head

Transactions

Award
Common Stock
[F1]
2026-02-19+1,301→ 38,808 total
Tax Payment
Common Stock
[F2][F3]
2026-02-20$94.10/sh−326$30,677→ 38,482 total
Award
Employee Option (right to buy)
[F4]
2026-02-20+19,351→ 19,351 total
Exercise: $94.48Exp: 2036-02-20→ Common Stock (19,351 underlying)
Award
Restricted Stock Units
[F5][F6]
2026-02-20+5,281→ 5,281 total
→ Common Stock (5,281 underlying)

Footnotes (6)

[F1]Represents shares of common stock that vested on February 19, 2026, upon the determination by the Compensation Committee of the Issuer's Board of Directors of the satisfaction of performance criteria underlying an award of performance stock units ("PSUs") granted to the Reporting Person on February 17, 2023, under the terms of the Issuer's 2013 Omnibus Incentive Plan.
[F2]Shares otherwise issuable were witheld to satisfy tax obligations arising out of vesting of the Reporting Person's PSUs.
[F3]Weighted average price. These shares were sold in multiple transactions at prices ranging from $94.10 to $94.29, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.
[F4]The stock options are excercisable in three installments of 33%, 33% and 34% on February 20, 2027, 2028 and 2029, respectively.
[F5]Each restricted stock unit ("RSU") represents a contingent right to recieve one share of the Issuer's common stock.
[F6]All of the RSUs will vest on February 20, 2029.

Signature

Robert F. Buesinger by J. Feng, POA|2026-02-23

1 file