[Form 4] WESTLAKE CORP Insider Trading Activity

Rhea-AI Filing Summary

Scott Szwejbka, SVP, HIP Segment Head at Westlake Corp (WLK), reported vesting and disposition activity in the company’s common stock. On 10/01/2025 10,840 restricted stock units (RSUs) vested and converted one-for-one into 10,840 shares of common stock, increasing his beneficial holdings to 16,659 shares. On 10/02/2025 a disposition of 3,842 shares occurred, listed as a sale at $76.70 per share, reducing his beneficial ownership to 12,817 shares; the filing explains these shares were withheld to satisfy tax obligations arising from the RSU vesting. The Form 4 was signed by power of attorney on 10/03/2025.

Positive

• 10,840 RSUs vested into common stock on 10/01/2025
• RSU grant executed per schedule (grant date 10/01/2021, four-year vesting)

Negative

• 3,842 shares were disposed of (withheld) to satisfy tax obligations after vesting
• Reported direct holdings decreased from 16,659 to 12,817 shares following the withholding

Insights

Corporate Governance Expert

Insider RSU vesting and tax-withholding sale changed direct holdings by 3,842 shares.

The filing documents a standard executive compensation event where 10,840 RSUs vested into common stock on 10/01/2025, raising reported direct holdings to 16,659 shares. The subsequent 3,842 share disposition on 10/02/2025 was used to satisfy tax obligations and reduced holdings to 12,817 shares.

This pattern is administrative and common after vesting; it reflects compensation realization rather than an opportunistic open-market sale unconnected to vesting.

Compensation Analyst

RSU grant from 2021 completed its four-year vesting, converting to shares with tax withholding.

The explanation states the RSUs were granted on 10/01/2021 and vested on the fourth anniversary, yielding 10,840 shares. The filing explicitly notes 3,842 shares were withheld to cover tax obligations.

From a pay-structure view, this confirms the grant schedule executed as intended and that net new shares retained by the executive after tax withholding are 6,998 from this vesting event.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Szwejbka Scott Thomas

(Last) (First) (Middle)

2801 POST OAK BLVD., SUITE 600

(Street)

HOUSTON TX 77056

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
WESTLAKE CORP [ WLK ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP, HIP Segment Head

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/01/2025		M		10,840	A	$0(1)	16,659	D
Common Stock	10/02/2025		F		3,842(3)	D	$76.7	12,817	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(1)	10/01/2025		M			10,840	(2)	(2)	Common Stock	10,840	$0	0	D

Explanation of Responses:

1. Restricted stock units ("RSUs") convert into the Issuer's common stock on a one-for-one basis.

2. On October 1, 2021, the reporting person was granted 10,840 RSUs vesting on the fourth anniversay of the grant date.

3. Shares otherwise issuable were withheld to satisfy tax obligations arising out of the vesting of the reporting persons RSUs.

	Scott Szwejbka by J. Feng, POA	10/03/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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FAQ

What RSU transaction did Westlake insider Scott Szwejbka report (WLK)?

The Form 4 shows 10,840 RSUs vested on 10/01/2025, converting into 10,840 shares of Westlake common stock.

Why were 3,842 shares sold by the reporting person on 10/02/2025?

The filing states 3,842 shares were withheld to satisfy tax obligations arising from the RSU vesting.

How did these transactions change Szwejbka’s holdings in WLK?

After vesting, holdings rose to 16,659 shares; after tax-withholding on 10/02/2025, holdings were 12,817 shares.

What was the reported price for the disposed shares?

The Form 4 lists a price of $76.70 per share for the 3,842 shares disposed on 10/02/2025.

Who signed the Form 4 for Scott Szwejbka and when?

The Form 4 was signed by power of attorney J. Feng on 10/03/2025.