WESTLAKE CORP|4Feb 23, 2:40 PM ET

Chao Albert 4

4 · WESTLAKE CORP · Filed Feb 23, 2026

AI-generated summary of this filing

Updated Feb 23, 2026

Westlake (WLK) Exec Chairman Albert Chao Receives Awards, Sells Shares

What Happened

Albert Chao, Executive Chairman and Director of Westlake Corp (WLK), had 6,193 performance shares vest on Feb 19, 2026. To cover tax obligations, 2,501 of the vested shares were withheld/sold (proceeds ~$235,347). On Feb 20, 2026 he was also granted two derivative awards: 54,763 stock-option-type awards and 14,945 restricted stock units (RSUs).

Key Details

Transaction dates: Feb 19–20, 2026.
Vested shares: 6,193 PSUs vested (per award granted Feb 17, 2023).
Tax withholding/sale: 2,501 shares disposed to satisfy taxes; reported proceeds $235,347; sale prices ranged $94.10–$94.38 (weighted average reporting provided).
Grants on Feb 20, 2026: 54,763 derivative option awards and 14,945 RSUs (derivative awards shown as acquired at $0).
Option and RSU terms (from filing footnotes): the option awards are exercisable in three installments (33%, 33%, 34% on Feb 20 of 2027, 2028, 2029); each RSU converts to one share and all RSUs vest Feb 20, 2029.
Shares owned after transaction: not specified in the provided filing excerpt.
Filing timeliness: filing date Feb 23, 2026 (no late-filing flag noted in the provided data).

Context

The 2,501-share disposal was a tax-withholding event (routine when PSUs vest), not an open-market sale intended as a directional bet. The derivative grants are forward-looking compensation (stock options with staged exercise dates and RSUs that vest in 2029) and do not represent immediate purchases of stock.

Form 4

Period: 2026-02-19

DirectorExecutive Chairman

Transactions

Award
Common Stock
[F1]
2026-02-19+6,193→ 645,381 total
Tax Payment
Common Stock
[F2][F3]
2026-02-20$94.10/sh−2,501$235,347→ 642,880 total
Award
Employee Option (right to buy)
[F4]
2026-02-20+54,763→ 54,763 total
Exercise: $94.48Exp: 2036-02-20→ Common Stock (54,763 underlying)
Award
Restricted Stock Units
[F5][F6]
2026-02-20+14,945→ 14,945 total
→ Common Stock (14,945 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 $94.38, 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

Albert Chao by J. Feng, POA|2026-02-23

1 file