[Form 4] Westlake Corporation Insider Trading Activity

Rhea-AI Filing Summary

Westlake Corporation (WLK) director Catherine T. Chao reported restricted stock unit activity and changes in beneficial ownership. The filing shows acquisitions or grant-related entries dated 08/08/2025 and 08/09/2025, including 2,168 restricted stock units on 08/08/2025 and a separate 1,128 restricted stock unit transaction on 08/09/2025. The filing states restricted stock units convert one-for-one into common stock and that all of the 2,168 units will vest on August 8, 2026. An earlier grant of 1,128 RSUs was made on August 9, 2024 and vests on its first anniversary.

The report also shows beneficial ownership following the reported transactions of 5,580 shares held directly and 19,423 shares held indirectly in a trust for the reporting person, who serves as sole trustee. Explanations in the filing describe the trust and the one-for-one conversion feature of the RSUs.

Positive

• 2,168 restricted stock units granted on 08/08/2025 that convert one-for-one to common stock
• Documented beneficial ownership of 5,580 shares directly and 19,423 shares indirectly via a trust where the reporting person is sole trustee

Negative

• None.

Insights

Financial Analyst

TL;DR: Director received RSU awards and holds both direct and trust-held shares; transaction appears routine compensation-related activity.

The Form 4 shows grant and acquisition entries for restricted stock units totaling reported amounts of 2,168 and 1,128 units on consecutive dates in August 2025. The filing explicitly states RSUs convert one-for-one into common shares and that the 2,168 units vest on August 8, 2026. Post-transaction beneficial ownership is documented as 5,580 shares directly and 19,423 shares indirectly via a trust. From an analyst perspective, these entries reflect equity compensation and existing insider ownership rather than a liquidation or large-scale transfer. The filing does not disclose cash proceeds, sales, or exercises that would materially alter outstanding share counts or company leverage.

Corporate Governance Expert

TL;DR: Disclosure documents standard RSU grants and confirms trust-held shares; governance disclosures are complete and explicit.

The report names the reporting person as a director and provides explicit descriptions: RSUs convert one-for-one to common stock, certain RSUs vest on a stated date, and indirect ownership exists through a trust for which the reporting person is sole trustee. These elements satisfy standard Section 16 disclosure requirements by reporting beneficial ownership and the nature of indirect holdings. The filing does not show any sales, option exercises, or changes to voting arrangements beyond the trust disclosure. No governance red flags or adverse events are documented in the content provided.

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Chao Catherine T.

(Last) (First) (Middle)

2801 POST OAK BLVD., STE. 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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
08/08/2025

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	08/09/2025		M		1,128	A	(1)	5,580	D
Common Stock								19,423	I	by Trust(2)

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)	08/08/2025		A		2,168		(3)	(3)	Common Stock	2,168	$0	2,168	D
Restricted Stock Units	(1)	08/09/2025		M			1,128	(4)	(4)	Common Stock	1,128	$0	0	D

Explanation of Responses:

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

2. These shares are held in a trust for the benefit of the reporting person, who also serves as sole trustee.

3. All of the restricted stock units will vest on August 8, 2026.

4. On August 9, 2024 the reporting person was granted 1,128 restricted stock units vesting on the first anniversary of the grant date.

	Catherine Chao by J Feng POA	08/11/2025
	** 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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider activity did Westlake (WLK) director Catherine T. Chao report?

The Form 4 reports RSU activity dated 08/08/2025 and 08/09/2025, including a grant of 2,168 restricted stock units and an additional 1,128 RSU transaction.

How do the restricted stock units convert for WLK reported on the Form 4?

The filing states the restricted stock units convert one-for-one into Westlake common stock.

When do the reported RSUs vest?

The filing explicitly says the 2,168 RSUs will vest on August 8, 2026. An earlier grant of 1,128 RSUs was made on August 9, 2024 and vests on its first anniversary per the filing.

How many Westlake shares does the reporting person beneficially own after these transactions?

The Form 4 shows 5,580 shares held directly and 19,423 shares held indirectly in a trust for the benefit of the reporting person.

What is the nature of the indirect ownership disclosed on the Form 4 for WLK?

The filing states the indirectly held shares are held in a trust for the benefit of the reporting person, who serves as sole trustee.