[Form 4] Westlake Corporation Insider Trading Activity

Rhea-AI Filing Summary

David Tsung-Hung Chao, a director of Westlake Corp (WLK), reported changes in his equity holdings. The filing shows direct beneficial ownership of 8,912 shares and indirect beneficial ownership of 19,423 shares held in a trust for which he serves as sole trustee. The filing records restricted stock units (RSUs): 2,168 RSUs were acquired on 08/08/2025 and 1,128 RSUs were modified on 08/09/2025. RSUs convert one-for-one into common stock and, per the filing, all RSUs will vest on 08/08/2026; the 1,128 RSUs were originally granted on 08/09/2024 and vest on their first anniversary.

Positive

• Director ownership alignment: Reporting person holds 8,912 shares directly and 19,423 shares indirectly via a trust where he is sole trustee
• Equity compensation granted: 2,168 RSUs acquired and 1,128 RSUs recorded/modified, converting one-for-one into common stock
• Clear vesting schedule: Filing states all RSUs will vest on 08/08/2026, showing time-based alignment with shareholders

Negative

• None.

Insights

Securities Analyst

TL;DR: Director reported routine equity awards and ongoing ownership; no sales or dispositions were reported.

The Form 4 discloses that David Chao holds 8,912 shares directly and 19,423 shares indirectly via a trust where he is sole trustee. The filing documents equity compensation activity consisting of 2,168 RSUs acquired and the modification/administrative entry for 1,128 RSUs. The RSUs convert one-for-one into common stock and are subject to vesting, with the filing indicating a vesting date of 08/08/2026 for the RSU pool. There are no reported sales or transfers that would reduce his stake. From a market-impact perspective, these entries reflect compensation and ownership alignment rather than immediate liquidity events.

Corporate Governance Expert

TL;DR: Insider holdings and time‑based RSU vesting suggest alignment with shareholders; transactions appear administrative and non-dispositive.

The reporting shows an executive director with both direct and trust-held shares, signaling retained economic exposure to Westlake Corp. The disclosure that the trust holds 19,423 shares and that the reporting person serves as sole trustee is material to governance transparency. The RSUs noted in the filing convert one-for-one and have specified vesting schedules, with all RSUs set to vest on 08/08/2026. These are standard equity-based incentives; the filing does not disclose accelerated vesting, sales, or transfers that would raise governance concerns.

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
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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 David Tsung-Hung

(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)	8,912	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.

	David 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 transactions did Westlake (WLK) director David Chao report on Form 4?

The Form 4 reports the acquisition/administrative recording of restricted stock units: 2,168 RSUs acquired on 08/08/2025 and 1,128 RSUs modified on 08/09/2025, and updates to beneficial ownership totals.

How many Westlake shares does David Chao beneficially own according to the filing?

The filing shows 8,912 shares directly and 19,423 shares indirectly (held in a trust for which he is sole trustee).

When do the reported RSUs vest for David Chao at WLK?

Per the filing, all restricted stock units will vest on 08/08/2026. The 1,128 RSUs were originally granted on 08/09/2024 and vest on the first anniversary of that grant.

Do the RSUs convert into common stock one-for-one?

Yes. The filing explicitly states the restricted stock units convert into the issuer's common stock on a one-for-one basis.

Is David Chao the trustee for any shares reported on the Form 4?

Yes. The filing states that certain shares are held in a trust for the benefit of the reporting person, and he serves as the sole trustee.