John Tsung-Chen Chao - 19 Feb 2026 Form 4 Insider Report for WESTLAKE CORP (WLK)

Role
Director
Signature
John T. Chao by J. Feng, POA
Issuer symbol
WLK
Transactions as of
19 Feb 2026
Net transactions value
-$8,563
Form type
4
Filing time
23 Feb 2026, 14:41:33 UTC
Previous filing
19 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Chao John Tsung-chen Director 2801 POST OAK BLVD., STE. 600, HOUSTON John T. Chao by J. Feng, POA 23 Feb 2026 0001746472

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction WLK Common Stock Award $0 +213 +2.7% $0.000000 7,979 19 Feb 2026 Direct F1
transaction WLK Common Stock Tax liability $8,563 -91 -1.1% $94.10 7,888 20 Feb 2026 Direct F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction WLK Employee Option (right to buy) Award $0 +4,044 $0.000000 4,044 20 Feb 2026 Common Stock 4,044 $94.48 Direct F3
transaction WLK Restricted Stock Units Award $0 +1,104 $0.000000 1,104 20 Feb 2026 Common Stock 1,104 Direct F4, F5
transaction WLK Restricted Stock Units Award $0 +2,434 $0.000000 2,434 20 Feb 2026 Common Stock 2,434 Direct F4, F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
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 The stock options are excercisable in three installments of 33%, 33% and 34% on February 20, 2027, 2028 and 2029, respectively.
F4 Each restricted stock unit ("RSU") represents a contingent right to recieve one share of the Issuer's common stock.
F5 All of the RSUs will vest on February 20, 2029.