Westlake CFO exercises RSUs, shares withheld for tax

WESTLAKE CORP EVP & CFO Mark Steven Bender reported routine equity compensation activity.

Rhea-AI Filing Summary

WESTLAKE CORP EVP & CFO Mark Steven Bender reported routine equity compensation activity. On May 12, 2026, he exercised 13,164 restricted stock units (RSUs), which converted into the company’s common stock on a one-for-one basis, reflecting the vesting of RSUs granted on May 12, 2023.

On May 13, 2026, 5,284 common shares otherwise issuable were withheld to cover tax obligations arising from this vesting, a non-market, tax-withholding disposition. After these transactions, he beneficially owns 35,895 common shares directly.

Insider Trade Summary

13,164 shares exercised/converted

Exercise 3 txns

Insider Bender Mark Steven

Role EVP & CFO

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	5,284	$97.34	$514K
Exercise	Restricted Stock Units	13,164	$0.00	$0.00
Exercise	Common Stock	13,164	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 0 contracts (Direct); Common Stock — 35,895 shares (Direct)

Footnotes (3)

1. F1. Restricted stock units ("RSUs") convert into the Issuer's common stock on a one-for-one basis.
2. F2. On May 12, 2023, the reporting person was granted 13,164 RSUs vesting on the third anniversay of the grant date.
3. F3. Shares otherwise issuable were withheld to satisfy tax obligations arising out of the vesting of the reporting persons RSUs.

Key Figures

RSUs exercised: 13,164 units Shares withheld for tax: 5,284 shares Shares held after transactions: 35,895 shares +3 more

6 metrics

RSUs exercised 13,164 units Restricted stock units converting into common stock on May 12, 2026

Shares withheld for tax 5,284 shares Common shares withheld to satisfy tax obligations on May 13, 2026

Shares held after transactions 35,895 shares Direct common stock ownership following reported Form 4 transactions

Tax-withholding price $97.34 per share Price per share used for 5,284-share tax-withholding disposition

Exercise transactions 1 transaction, 13,164 shares Derivative exercise/conversion count and shares from transactionSummary

Tax-withholding transactions 1 transaction, 5,284 shares Tax withholding count and shares from transactionSummary

Key Terms

Restricted Stock Units, RSUs, tax obligations, derivative security, +1 more

5 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.

RSUs financial

"On May 12, 2023, the reporting person was granted 13,164 RSUs vesting on the third anniversay of the grant date."

RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.

tax obligations financial

"Shares otherwise issuable were withheld to satisfy tax obligations arising out of the vesting of the reporting persons RSUs."

derivative security financial

"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.

tax-withholding disposition financial

"transaction_action: tax-withholding disposition"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

FAQ

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

What insider transactions did WESTLAKE CORP (WLK) report for its CFO?

WESTLAKE CORP’s CFO, Mark Steven Bender, exercised 13,164 restricted stock units into common shares and had 5,284 shares withheld for taxes. These are compensation-related and tax-withholding entries, not open-market buys or sells, leaving him with 35,895 directly held shares.

Did the WESTLAKE CORP (WLK) CFO buy or sell shares on the open market?

The filing shows no open-market purchases or sales. Instead, the CFO exercised 13,164 RSUs into common stock and 5,284 shares were withheld to satisfy tax obligations, which is a non-market, administrative disposition tied to equity compensation vesting.

How many WESTLAKE CORP (WLK) shares does the CFO hold after these transactions?

After the reported transactions, the CFO directly holds 35,895 shares of WESTLAKE CORP common stock. This figure reflects the RSU conversion and subsequent tax-withholding share reduction disclosed in the Form 4, giving investors a snapshot of his current direct equity stake.

What are the details of the WESTLAKE CORP (WLK) CFO’s RSU vesting?

The CFO was granted 13,164 restricted stock units on May 12, 2023, vesting on the third anniversary of the grant date. Upon vesting, these RSUs converted one-for-one into common shares, triggering the tax-withholding of 5,284 shares described in the Form 4 footnotes.

Is the tax-withholding in the WESTLAKE CORP (WLK) Form 4 a stock sale?

The 5,284-share disposition is described as shares withheld to satisfy tax obligations from RSU vesting, not an open-market stock sale. Such F-code transactions are administrative and reflect payment of taxes in shares rather than a discretionary trading decision.

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

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Accepted by SEC EDGAR 05/14/2026 - 12:33 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^*

Bender Mark Steven

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/12/2026

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	05/12/2026		M		13,164	A	$0(1)	41,179	D
Common Stock	05/13/2026		F		5,284(3)	D	$97.34	35,895	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)	05/12/2026		M			13,164	(2)	(2)	Common Stock	13,164	$0	0	D

Explanation of Responses:

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

2. On May 12, 2023, the reporting person was granted 13,164 RSUs vesting on the third anniversay of the grant date.

3. Shares otherwise issuable were withheld to satisfy tax obligations arising out of the vesting of the reporting persons RSUs.

	M. Steven Bender by J Feng POA	05/14/2026
	** 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)