Westlake director converts 2,168 RSUs to shares

Westlake Corp director R. Bruce Northcutt reported an option-style event involving restricted stock units.

Rhea-AI Filing Summary

Westlake Corp director R. Bruce Northcutt reported an option-style event involving restricted stock units. On August 8, 2026, 2,168 restricted stock units were exercised and converted on a one-for-one basis into 2,168 shares of common stock. Following the conversion, Northcutt directly holds 23,351 shares of Westlake common stock. The units had been granted on August 8, 2025 and vested on the first anniversary of the grant date.

Insider Trade Summary

2,168 shares exercised/converted

Exercise 2 txns

Insider NORTHCUTT R BRUCE

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units F1, F2	2,168	$0.00	$0.00
Exercise	Common Stock F1	2,168	--	--

Holdings After Transaction: Restricted Stock Units — 2,168 contracts (Direct); Common Stock — 23,351 shares (Direct)

Footnotes (2)

1. F1. Restricted stock units convert into the Issuer's common stock on a one-for-one basis.
2. F2. On August 8, 2025 the reporting person was granted 2,168 restricted stock units vesting on the first anniversary of the grant date.

Key Figures

RSUs exercised: 2,168 units Common shares acquired via conversion: 2,168 shares Shares held after transaction: 23,351 shares

3 metrics

RSUs exercised 2,168 units Restricted stock units converted into common stock on August 8, 2026

Common shares acquired via conversion 2,168 shares Shares of Westlake common stock received from RSU conversion

Shares held after transaction 23,351 shares Direct Westlake common stock holdings following reported Form 4 events

Key Terms

Restricted Stock Units, derivative security, Exercise or conversion of derivative security

3 terms

Restricted Stock Units financial

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

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.

derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

Exercise or conversion of derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

FAQ

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

What insider transaction did WESTLAKE CORP (WLK) director R. Bruce Northcutt report?

R. Bruce Northcutt reported exercising 2,168 restricted stock units that converted into 2,168 shares of Westlake common stock on August 8, 2026, reflecting a vesting-related equity award rather than an open-market purchase or sale.

How many WESTLAKE CORP (WLK) shares does R. Bruce Northcutt hold after this Form 4?

After the reported transactions, R. Bruce Northcutt directly holds 23,351 shares of Westlake Corp common stock. This reflects the addition of 2,168 shares received from the conversion of previously granted restricted stock units.

What happened to the 2,168 restricted stock units reported for WESTLAKE CORP (WLK)?

The 2,168 restricted stock units were exercised and converted into 2,168 shares of Westlake common stock on a one-for-one basis, as disclosed in the footnotes explaining the RSU conversion mechanics.

When were the restricted stock units for WESTLAKE CORP (WLK) originally granted to Northcutt?

The filing states that on August 8, 2025, R. Bruce Northcutt was granted 2,168 restricted stock units, which were scheduled to vest on the first anniversary of the grant date before converting into common shares.

Was the WESTLAKE CORP (WLK) insider transaction under a Rule 10b5-1 plan?

The document-level checkbox for Rule 10b5-1 trading plans is marked false, indicating these transactions were not affirmatively reported as being executed pursuant to a pre-arranged 10b5-1 trading plan.

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

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Accepted by SEC EDGAR 08/10/2026 - 01:53 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^*

NORTHCUTT R BRUCE

(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)
08/08/2026

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
Common Stock	08/08/2026		M		2,168	A	(1)	23,351	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)	08/08/2026		M			2,168	(2)	(2)	Common Stock	2,168	$0	2,168	D

Explanation of Responses:

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

2. On August 8, 2025 the reporting person was granted 2,168 restricted stock units vesting on the first anniversary of the grant date.

	Mark McCollum by J Feng POA	08/10/2026
	** 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)