Jean-Marc Gilson - 20 Feb 2026 Form 4 Insider Report for WESTLAKE CORP (WLK)

Role
President and CEO
Signature
Jea-Marc Gilson by J. Feng, POA
Issuer symbol
WLK
Transactions as of
20 Feb 2026
Net transactions value
$0
Form type
4
Filing time
23 Feb 2026, 14:44:53 UTC
Previous filing
29 Aug 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Gilson Jean-Marc President and CEO 2801 POST OAK BLVD., SUITE 600, HOUSTON Jea-Marc Gilson by J. Feng, POA 23 Feb 2026 0002030037

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 +109,139 $0.000000 109,139 20 Feb 2026 Common Stock 109,139 $94.48 Direct F1
transaction WLK Restricted Stock Units Award $0 +29,784 $0.000000 29,784 20 Feb 2026 Common Stock 29,784 Direct F2, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The stock options are excercisable in three installments of 33%, 33% and 34% on February 20, 2027, 2028 and 2029, respectively.
F2 Each restricted stock unit ("RSU") represents a contingent right to recieve one share of the Issuer's common stock.
F3 All of the RSUs will vest on February 20, 2029.