Westlake (NYSE: WLK) director gets 2,184 RSUs vesting in 2027

Q: What equity award did Westlake Corp (WLK) director David Tsung-Hung Chao receive?

David Tsung-Hung Chao received a grant of 2,184 Restricted Stock Units (RSUs) in Westlake Corp on August 14, 2026. These RSUs are a form of stock-based compensation that convert into common shares upon vesting on a future date.

Q: When do the newly granted RSUs for Westlake Corp (WLK) vest?

All of the 2,184 RSUs vest on August 14, 2027 . Once vested, each RSU converts into one share of Westlake common stock, increasing the director’s actual share ownership if the units are settled in stock and retained.

Q: Does the Westlake Corp (WLK) Form 4 involve any stock sales or purchases in the market?

The Form 4 reports no open-market stock purchases or sales . It reflects only a grant of 2,184 Restricted Stock Units at a price of $0.00 per unit, consistent with equity compensation awards rather than cash transactions in the public market.

Q: Is the Westlake Corp (WLK) RSU grant to David Tsung-Hung Chao tied to a Rule 10b5-1 trading plan?

The filing indicates the Rule 10b5-1 checkbox is not affirmed . This RSU grant is reported as a compensation award, not as a transaction executed under a pre-arranged Rule 10b5-1 trading plan for buying or selling existing shares.

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Westlake Corp (WLK) director David Tsung-Hung Chao reported receiving a grant of 2,184 Restricted Stock Units (RSUs) on August 14, 2026. Each RSU converts into one share of Westlake common stock. All 2,184 RSUs are scheduled to vest on August 14, 2027, and the reported holdings after this award total 2,184 RSUs held directly.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Chao David Tsung-Hung

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units ^{F1, F2}	2,184	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 2,184 shares (Direct)

Footnotes (2)

F1. Restricted stock units convert into the Issuer's common stock on a one-for-one basis.
F2. All of the restricted stock units will vest on August 14, 2027.

Key Figures

RSUs granted: 2,184 units Exercise/Conversion ratio: 1.0 Vesting date: August 14, 2027 +2 more

5 metrics

RSUs granted 2,184 units Restricted Stock Units awarded to David Tsung-Hung Chao on August 14, 2026

Exercise/Conversion ratio 1.0 Each RSU converts into one share of Westlake common stock on a one-for-one basis

Vesting date August 14, 2027 All of the 2,184 restricted stock units will vest on this date

Price per RSU $0.00 Reported transaction price per Restricted Stock Unit in the grant

Holdings after transaction 2,184 units Total Restricted Stock Units held directly by David Tsung-Hung Chao after the award

Key Terms

Restricted Stock Units, vest, one-for-one basis

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.

vest financial

"All of the restricted stock units will vest on August 14, 2027."

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

one-for-one basis financial

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

FAQ

What equity award did Westlake Corp (WLK) director David Tsung-Hung Chao receive?

David Tsung-Hung Chao received a grant of 2,184 Restricted Stock Units (RSUs) in Westlake Corp on August 14, 2026. These RSUs are a form of stock-based compensation that convert into common shares upon vesting on a future date.

When do the newly granted RSUs for Westlake Corp (WLK) vest?

All of the 2,184 RSUs vest on August 14, 2027. Once vested, each RSU converts into one share of Westlake common stock, increasing the director’s actual share ownership if the units are settled in stock and retained.

How many Westlake Corp (WLK) RSUs does David Tsung-Hung Chao hold after this Form 4 transaction?

Following this transaction, David Tsung-Hung Chao’s reported holdings consist of 2,184 Restricted Stock Units held directly. These units represent the award reported and will convert into an equal number of common shares upon vesting, assuming settlement in stock.

Does the Westlake Corp (WLK) Form 4 involve any stock sales or purchases in the market?

The Form 4 reports no open-market stock purchases or sales. It reflects only a grant of 2,184 Restricted Stock Units at a price of $0.00 per unit, consistent with equity compensation awards rather than cash transactions in the public market.

Is the Westlake Corp (WLK) RSU grant to David Tsung-Hung Chao tied to a Rule 10b5-1 trading plan?

The filing indicates the Rule 10b5-1 checkbox is not affirmed. This RSU grant is reported as a compensation award, not as a transaction executed under a pre-arranged Rule 10b5-1 trading plan for buying or selling existing shares.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/17/2026 - 12:26 PM Accepted by SEC EDGAR 08/17/2026 - 12:25 PM

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 David Tsung-Hung

(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)
08/14/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units	⁽¹⁾	08/14/2026		A		2,184		⁽²⁾	⁽²⁾	Common Stock	2,184	$0	2,184	D

Explanation of Responses:

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

2. All of the restricted stock units will vest on August 14, 2027.

	David Chao by J Feng POA	08/17/2026
	** 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)

Source: View Original Filing on SEC EDGAR