Westlake Corp (NYSE: WLK) EVP converts RSUs, withholds shares for taxes

Rhea-AI Filing Summary

Westlake Corp executive Robert F. Buesinger reported equity award activity and related tax withholding. On February 17, 2026, 3,478 restricted stock units were exercised into the same number of common shares at $0.00 per share, reflecting the vesting of RSUs granted on February 17, 2023. Following this conversion, his direct common stock holdings rose to 38,410 shares. On February 18, 2026, 903 common shares valued at $98.95 per share were disposed of to cover tax obligations from the RSU vesting, reducing his direct holdings to 37,507 shares.

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^*

Buesinger Robert F.

(Last) (First) (Middle)

2801 POST OAK BLVD., STE. 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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, PEM Segment Head

3. Date of Earliest Transaction (Month/Day/Year)
02/17/2026

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	02/17/2026		M		3,478	A	$0(1)	38,410	D
Common Stock	02/18/2026		F		903(3)	D	$98.95	37,507	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)	02/17/2026		M			3,478	(2)	(2)	Common Stock	3,478	$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 February 17, 2023, the reporting person was granted 3,478 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.

	Robert F. Buesinger by J Feng POA	02/19/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transactions did Westlake Corp (WLK) report for Robert F. Buesinger?

Westlake Corp reported that Robert F. Buesinger exercised 3,478 restricted stock units into common stock, then disposed of 903 common shares to cover tax obligations. These transactions were tied to previously granted RSUs that vested on the third anniversary of the February 17, 2023 grant.

Did the Westlake Corp (WLK) executive make an open-market sale of shares?

The filing shows no open-market sale. Instead, 903 common shares were disposed of to satisfy tax obligations arising from the vesting of restricted stock units, a common administrative transaction when equity awards convert into shares and trigger tax liabilities for the recipient.

How many Westlake Corp (WLK) shares did Robert F. Buesinger acquire from RSUs?

Robert F. Buesinger acquired 3,478 Westlake Corp common shares through the conversion of restricted stock units. The RSUs converted on a one-for-one basis into common stock upon vesting, reflecting an earlier grant dated February 17, 2023 that vested on its third anniversary.

What is Robert F. Buesinger’s direct Westlake Corp (WLK) shareholding after these transactions?

After the RSU conversion and subsequent tax-withholding share disposition, Robert F. Buesinger directly holds 37,507 Westlake Corp common shares. His holdings first increased to 38,410 shares from the RSU conversion, then decreased by 903 shares withheld to cover associated tax liabilities.

At what price were Westlake Corp (WLK) shares valued for the tax-withholding disposition?

The 903 Westlake Corp common shares used to satisfy tax obligations were valued at $98.95 per share. This valuation applied to the shares disposed of in connection with the vesting of previously granted restricted stock units that converted into common stock for the executive.

What were the terms of the Westlake Corp (WLK) restricted stock units involved in this Form 4?

The restricted stock units converted into Westlake Corp common stock on a one-for-one basis. They were part of a grant of 3,478 RSUs awarded on February 17, 2023, which vested on the third anniversary of the grant date before converting into common shares.