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Westlake Corp (WLK) director exercises 2,168 RSUs into common stock holdings

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(Neutral)
Form Type
4

Rhea-AI Filing Summary

Westlake Corp director Roger A. Cregg reported the vesting and exercise of 2,168 restricted stock units into an equal number of shares of common stock on August 8, 2026. Restricted stock units convert into common stock on a one-for-one basis. Following the transaction, Cregg directly holds 3,507 shares of common stock.

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Insider CREGG ROGER A
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 shares (Direct); Common Stock — 3,507 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.
Restricted stock units exercised 2,168 units Restricted stock units converted into common stock on August 8, 2026
Common shares acquired from RSUs 2,168 shares Shares of common stock received upon RSU conversion
Common shares held after transaction 3,507 shares Directly held Westlake Corp common stock following the Form 4 transaction
RSU grant date August 8, 2025 Date 2,168 restricted stock units were originally granted
RSU vesting term First anniversary RSUs vest on the first anniversary of the August 8, 2025 grant
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.
Exercise or conversion of derivative security financial
"transaction_code_description: Exercise or conversion of derivative security"
derivative security financial
"transaction_code_description: 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.

FAQ

What did Westlake Corp (WLK) director Roger A. Cregg report in this Form 4?

Roger A. Cregg reported the exercise of 2,168 restricted stock units into 2,168 shares of Westlake Corp common stock on August 8, 2026, increasing his directly held common stock position to 3,507 shares after the transaction.

How many Westlake Corp (WLK) restricted stock units did Cregg convert and at what ratio?

Cregg converted 2,168 restricted stock units into common stock at a one-for-one ratio. A footnote explains that each restricted stock unit converts into one share of Westlake Corp common stock, so 2,168 units became 2,168 common shares in this transaction.

What are Roger A. Cregg’s Westlake Corp (WLK) common stock holdings after this Form 4 transaction?

After the reported transaction, Cregg directly holds 3,507 shares of Westlake Corp common stock. This reflects the addition of 2,168 shares received from the conversion of previously granted restricted stock units that vested and were exercised on August 8, 2026.

Were the Westlake Corp (WLK) restricted stock units newly granted in this Form 4?

No. A footnote states the 2,168 restricted stock units were granted on August 8, 2025 and vested on the first anniversary of that grant date. The Form 4 now reports their conversion into common stock upon vesting.

Does this Westlake Corp (WLK) Form 4 show any open-market share purchases or sales?

No open-market purchases or sales are reported. The Form 4 shows an exercise or conversion of derivative securities (restricted stock units) into common stock, with no per-share market trading price disclosed for the resulting common shares.

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SEC Form 4
FORM 4UNITED 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*
CREGG ROGER A

(Last)(First)(Middle)
2801 POST OAK BLVD., SUITE 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)
XDirector10% 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)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock08/08/2026M2,168A(1)3,507D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Units(1)08/08/2026M2,168 (2) (2)Common Stock2,168$02,168D
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.
Roger Cregg by J Feng POA08/10/2026
** Signature of Reporting PersonDate
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)