Westlake chair exercises 16,555 RSUs into stock

WESTLAKE CORP Executive Chairman Albert Chao reported RSU vesting and related share withholding.

Rhea-AI Filing Summary

WESTLAKE CORP Executive Chairman Albert Chao reported RSU vesting and related share withholding. On February 17, he exercised 16,555 restricted stock units, which convert into common stock on a one-for-one basis, resulting in 16,555 common shares acquired at a stated price of $0.00 per share.

On February 18, 5,089 common shares were disposed of at $98.95 per share to satisfy tax obligations arising from the RSU vesting, rather than through an open-market sale. After these transactions, he directly owned 639,188 shares of Westlake common stock.

Insider Trade Summary

16,555 shares exercised/converted

Exercise 3 txns

Insider Chao Albert

Role Executive Chairman

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	5,089	$98.95	$504K
Exercise	Restricted Stock Units	16,555	$0.00	$0.00
Exercise	Common Stock	16,555	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 0 contracts (Direct); Common Stock — 639,188 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 February 17, 2023, the reporting person was granted 16,555 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.

FAQ

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What insider transactions did Westlake (WLK) Executive Chairman Albert Chao report?

Albert Chao reported vesting of 16,555 restricted stock units that converted into an equal number of Westlake common shares, followed by a disposition of 5,089 common shares used to satisfy tax obligations arising from the RSU vesting, leaving him with 639,188 directly held shares.

How many Westlake (WLK) shares did Albert Chao acquire through RSU vesting?

Albert Chao acquired 16,555 Westlake common shares when his restricted stock units vested and converted on a one-for-one basis. These RSUs were originally granted on February 17, 2023 and vested on the third anniversary of the grant date, according to the disclosed footnotes.

Why were 5,089 Westlake (WLK) shares disposed of in Albert Chao’s Form 4?

The 5,089 Westlake common shares were withheld and disposed of to cover tax obligations triggered by the vesting of Albert Chao’s restricted stock units. The filing specifies this as a tax-withholding disposition, not an open-market sale, with the shares valued at $98.95 each.

What is Albert Chao’s Westlake (WLK) share ownership after these transactions?

Following the RSU conversion and the related tax-withholding share disposition, Albert Chao directly owns 639,188 shares of Westlake common stock. This post-transaction balance reflects both the 16,555 shares acquired from RSU vesting and the 5,089 shares withheld for taxes.

What were the original terms of Albert Chao’s Westlake (WLK) RSU grant?

Albert Chao was granted 16,555 restricted stock units on February 17, 2023, with the award vesting on the third anniversary of the grant date. Upon vesting, each RSU converted into one share of Westlake common stock, as disclosed in the Form 4 footnotes.

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

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Accepted by SEC EDGAR 02/19/2026 - 03:19 PM EST 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^*

Chao Albert

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Executive Chairman

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		16,555	A	$0(1)	644,277	D
Common Stock	02/18/2026		F		5,089(3)	D	$98.95	639,188	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			16,555	(2)	(2)	Common Stock	16,555	$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 16,555 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.

	Albert Chao 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.
* 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.
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