James Chao - 19 Feb 2026 Form 4 Insider Report for WESTLAKE CORP (WLK)

Role
Senior Chairman, Director
Signature
James Chao by J. Feng, POA
Issuer symbol
WLK
Transactions as of
19 Feb 2026
Net transactions value
-$147,644
Form type
4
Filing time
23 Feb 2026, 14:39:04 UTC
Previous filing
19 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Chao James Senior Chairman, Director 2801 POST OAK BLVD., STE. 600, HOUSTON James Chao by J. Feng, POA 23 Feb 2026 0001299505

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction WLK Common Stock Award $0 +3,884 +8.2% $0.000000 51,343 19 Feb 2026 Direct F1
transaction WLK Common Stock Tax liability $147,644 -1,569 -3.1% $94.10 49,774 20 Feb 2026 Direct F2, F3

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 +27,382 $0.000000 27,382 20 Feb 2026 Common Stock 27,382 $94.48 Direct F4
transaction WLK Restricted Stock Units Award $0 +7,472 $0.000000 7,472 20 Feb 2026 Common Stock 7,472 Direct F5, F6
* 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 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.