Westlake director converts 2,168 stock units

Westlake Corp director Kimberly S. Lubel reported the exercise and conversion of 2,168 restricted stock units into 2,168 shares of common stock on August 8, 2026.

Rhea-AI Filing Summary

Westlake Corp director Kimberly S. Lubel reported the exercise and conversion of 2,168 restricted stock units into 2,168 shares of common stock on August 8, 2026. Following this transaction, Lubel directly holds 13,821 shares of common stock. The restricted stock units convert into common stock on a one-for-one basis and were originally granted on August 8, 2025, with vesting on the first anniversary of the grant date.

Insider Trade Summary

2,168 shares exercised/converted

Exercise 2 txns

Insider Lubel Kimberly S

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 — 13,821 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 Converted: 2,168 restricted stock units Common Shares Acquired: 2,168 shares Post-transaction Common Holdings: 13,821 shares +2 more

5 metrics

RSUs Converted 2,168 restricted stock units Restricted stock units exercised and converted on August 8, 2026

Common Shares Acquired 2,168 shares Common stock received upon exercise or conversion of derivative security

Post-transaction Common Holdings 13,821 shares Directly owned common stock after the August 8, 2026 transaction

RSU Grant Date August 8, 2025 Date 2,168 restricted stock units were granted, vesting on first anniversary

RSU-to-Stock Ratio 1:1 Restricted stock units convert into common stock on a one-for-one basis

Key Terms

Restricted Stock Units, derivative security, acquired_disposed_code

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 M is described as 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.

acquired_disposed_code financial

"The acquired_disposed_code field indicates whether securities were acquired or disposed."

FAQ

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

What did Westlake Corp (WLK) director Kimberly S. Lubel report in this Form 4?

Kimberly S. Lubel reported exercising 2,168 restricted stock units into 2,168 shares of Westlake Corp common stock on August 8, 2026, through an exercise or conversion of a derivative security.

How many Westlake Corp (WLK) shares does Kimberly S. Lubel now own directly?

After the reported transaction, Kimberly S. Lubel directly holds 13,821 shares of Westlake Corp common stock. This figure reflects her direct ownership following the conversion of 2,168 restricted stock units into common shares.

How many restricted stock units did Kimberly S. Lubel convert at Westlake Corp (WLK)?

Lubel converted 2,168 restricted stock units into 2,168 shares of Westlake Corp common stock. The restricted stock units convert into common stock on a one-for-one basis according to the disclosed footnote.

When were the restricted stock units granted to Kimberly S. Lubel at Westlake Corp (WLK)?

The footnotes state that on August 8, 2025, Kimberly S. Lubel was granted 2,168 restricted stock units, which were scheduled to vest on the first anniversary of the grant date, aligning with the August 8, 2026 transaction.

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

The filing’s Rule 10b5-1 checkbox is not checked, and there is no footnote stating use of a trading plan. The transaction is reported simply as an exercise or conversion of a derivative security.

What type of securities were involved in Kimberly S. Lubel’s Westlake Corp (WLK) transaction?

The transaction involved restricted stock units as the derivative security and common stock as the underlying security. The restricted stock units convert into the issuer’s common stock on a one-for-one basis.

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

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Accepted by SEC EDGAR 08/10/2026 - 01:52 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^*

Lubel Kimberly S

(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)	13,821	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.

	Kimberly Lubel 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)