WESTLAKE CORP — Director's Dealing 2026

Feb 23, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTLAKE CORP (WLK)
CIK: 0001262823
Period of Report: 2026-02-19

Reporting Person: Chao John Tsung-chen (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-19	Common Stock	A	213	—	Acquired	7979	Direct
2026-02-20	Common Stock	F	91	$94.10	Disposed	7888	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-20	Employee Option (right to buy)	$94.48	A	4044	Acquired	2036-02-20	Common Stock (4044)	Direct
2026-02-20	Restricted Stock Units	$	A	1104	Acquired		Common Stock (1104)	Direct
2026-02-20	Restricted Stock Units	$	A	2434	Acquired		Common Stock (2434)	Direct

Footnotes

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.