Catherine Chao - Aug 8, 2025 Form 4 Insider Report for WESTLAKE CORP (WLK)

Role
Director
Signature
Catherine Chao by J Feng POA
Stock symbol
WLK
Transactions as of
Aug 8, 2025
Transactions value $
$0
Form type
4
Date filed
8/11/2025, 10:18 AM
Previous filing
Aug 12, 2024
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Chao Catherine T. Director 2801 POST OAK BLVD., STE. 600, HOUSTON Catherine Chao by J Feng POA 2025-08-11 0001974884

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction WLK Common Stock Options Exercise +1.13K +25.34% 5.58K Aug 9, 2025 Direct F1
holding WLK Common Stock 19.4K Aug 8, 2025 by Trust 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 Restricted Stock Units Award $0 +2.17K $0.00 2.17K Aug 8, 2025 Common Stock 2.17K Direct F1, F3
transaction WLK Restricted Stock Units Options Exercise $0 -1.13K -100% $0.00 0 Aug 9, 2025 Common Stock 1.13K Direct F1, F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Restricted stock units convert into the Issuer's common stock on a one-for-one basis.
F2 These shares are held in a trust for the benefit of the reporting person, who also serves as sole trustee.
F3 All of the restricted stock units will vest on August 8, 2026.
F4 On August 9, 2024 the reporting person was granted 1,128 restricted stock units vesting on the first anniversary of the grant date.