Scott Thomas Szwejbka - 01 Oct 2025 Form 4 Insider Report for WESTLAKE CORP (WLK)

Role: SVP, HIP Segment Head
Signature: Scott Szwejbka by J. Feng, POA
Issuer symbol: WLK
Transactions as of: 01 Oct 2025
Net transactions value: -$294,681
Form type: 4
Filing time: 03 Oct 2025, 12:20:29 UTC
Previous filing: 14 Apr 2025
Next filing: 19 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Szwejbka Scott Thomas	SVP, HIP Segment Head	2801 POST OAK BLVD., SUITE 600, HOUSTON	Scott Szwejbka by J. Feng, POA	03 Oct 2025	0002064540

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	WLK	Common Stock	Options Exercise	$0	+10,840	+186%	$0.000000	16,659	01 Oct 2025	Direct	F1
transaction	WLK	Common Stock	Tax liability	$294,681	-3,842	-23%	$76.70	12,817	02 Oct 2025	Direct	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	Restricted Stock Units	Options Exercise	$0	-10,840	-100%	$0.000000	0	01 Oct 2025	Common Stock	10,840		Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Restricted stock units ("RSUs") convert into the Issuer's common stock on a one-for-one basis.
F2	On October 1, 2021, the reporting person was granted 10,840 RSUs vesting on the fourth anniversay of the grant date.
F3	Shares otherwise issuable were withheld to satisfy tax obligations arising out of the vesting of the reporting persons RSUs.