Westlake Corp (WLK) director reports vesting of 1,339 RSUs into common stock

Rhea-AI Filing Summary

Westlake Corp director reports routine equity award vesting and share acquisition. A board member converted 1,339 restricted stock units into 1,339 shares of Westlake common stock on December 10, 2025, shown as an "M" code transaction. The form reports these shares as directly owned after the transaction.

The restricted stock units were originally granted on December 10, 2024 and vested on the first anniversary of the grant. Each unit converts into one share of common stock at an exercise price of $0, reflecting standard director equity compensation rather than an open-market purchase. The derivative position now shows zero restricted stock units remaining after this vesting and settlement.

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).

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^*

CREGG ROGER A

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
12/10/2025

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	12/10/2025		M		1,339	A	(1)	1,339	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)	12/10/2025		M			1,339	(2)	(2)	Common Stock	1,339	$0	0	D

Explanation of Responses:

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

2. On December 10, 2024 the reporting person was granted 1,339 restricted stock units vesting on the first anniversary of the grant date.

	Roger Cregg by J Feng POA	12/10/2025
	** 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 transaction did Westlake Corp (WLK) report in this Form 4?

A director of Westlake Corp (WLK) reported the conversion of 1,339 restricted stock units into 1,339 shares of common stock on December 10, 2025, coded as an "M" transaction.

Who is the reporting person and what is their relationship to Westlake Corp (WLK)?

The reporting person is Roger Cregg, who is identified as a Director of Westlake Corp. The form is filed for one reporting person and reports direct ownership of the common shares.

What are the terms of the Westlake Corp (WLK) restricted stock units involved?

The reporting person was granted 1,339 restricted stock units on December 10, 2024, vesting on the first anniversary of the grant. Each unit converts into one share of common stock at an exercise price of $0.

How many Westlake Corp (WLK) shares does the director own after this transaction?

Following the reported transaction, the form shows the director beneficially owns 1,339 shares of Westlake common stock in direct ownership.

Were any derivative securities left outstanding after the Westlake Corp (WLK) RSU conversion?

No. After the restricted stock units converted into common stock on December 10, 2025, the Form 4 shows 0 derivative securities of that RSU grant remaining beneficially owned.

Was the Westlake Corp (WLK) Form 4 transaction made under a Rule 10b5-1 plan?

The form includes a checkbox to indicate if a transaction was made under a Rule 10b5-1(c) trading plan, but the excerpt does not show that box marked as checked for this transaction.