Westlake director McCollum granted 2,184 RSUs

WESTLAKE CORP director Mark A. McCollum reported an equity compensation award of 2,184 Restricted Stock Units on August 14, 2026.

Rhea-AI Filing Summary

WESTLAKE CORP director Mark A. McCollum reported an equity compensation award of 2,184 Restricted Stock Units on August 14, 2026. These RSUs convert into an equal number of shares of common stock on a one-for-one basis and will fully vest on August 14, 2027. Following this grant, he holds 2,184 RSUs directly.

Insider Trade Summary

Grant/Award: 2,184 shares

Grant/Award 1 txn

Insider MCCOLLUM MARK A

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units F1, F2	2,184	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 2,184 contracts (Direct)

Footnotes (2)

1. F1. Restricted stock units convert into the Issuer's common stock on a one-for-one basis.
2. F2. All of the restricted stock units will vest on August 14, 2027.

Key Figures

RSUs granted: 2,184 Exercise/Conversion Price: 0.0000 Underlying common shares: 2,184 +3 more

6 metrics

RSUs granted 2,184 Restricted Stock Units granted on August 14, 2026

Exercise/Conversion Price 0.0000 Per-unit price for the RSU grant

Underlying common shares 2,184 Common stock issuable upon conversion of RSUs

Post-grant RSU holdings 2,184 Total Restricted Stock Units held directly after the transaction

Grant date August 14, 2026 Date of RSU award to director

Vesting date August 14, 2027 Date on which all granted RSUs vest

Key Terms

Restricted Stock Units, one-for-one basis, vest

3 terms

Restricted Stock Units financial

"security_title: "Restricted Stock Units""

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

one-for-one basis financial

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

vest financial

"All of the restricted stock units will vest on August 14, 2027."

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did WLK director Mark A. McCollum report on this Form 4?

He reported a grant of 2,184 Restricted Stock Units on August 14, 2026. These RSUs are equity compensation and convert into common stock on a one-for-one basis upon vesting.

How many WESTLAKE CORP (WLK) RSUs did Mark A. McCollum receive in this transaction?

He received 2,184 Restricted Stock Units. Each unit represents the right to receive one share of Westlake common stock when the award converts after vesting.

When do Mark A. McCollum’s newly granted WLK Restricted Stock Units vest?

All of the 2,184 Restricted Stock Units vest on August 14, 2027. After vesting, the RSUs convert into an equal number of Westlake common shares, subject to the plan terms.

What is the conversion ratio for Mark A. McCollum’s WLK Restricted Stock Units?

The RSUs convert into common stock on a one-for-one basis. Each of the 2,184 Restricted Stock Units corresponds to one share of Westlake common stock upon conversion.

What are Mark A. McCollum’s direct RSU holdings in WLK after this Form 4 transaction?

After this award, he directly holds 2,184 Restricted Stock Units. These units will vest on August 14, 2027 and then convert into Westlake common stock on a one-for-one basis.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/17/2026 - 12:27 PM EDT Accepted by SEC EDGAR 08/17/2026 - 12:27 PM EDT Learn about SEC filing dates

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^*

MCCOLLUM MARK A

(Last) (First) (Middle)

2801 POST OAK BLVD., STE. 600

(Street)

HOUSTON TEXAS 77056

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/14/2026

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

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

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

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

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)	08/14/2026		A		2,184		(2)	(2)	Common Stock	2,184	$0	2,184	D

Explanation of Responses:

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

2. All of the restricted stock units will vest on August 14, 2027.

	Mark A. McCollum by J Feng POA	08/17/2026
	** 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.
* Form 4: SEC 1474 (03-26)