STOCK TITAN

Westlake Corp (WLK) director converts 2,168 RSUs into common shares and updates holdings

(Neutral)
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Westlake Corp director Catherine T. Chao reported the vesting and exercise of 2,168 Restricted Stock Units into 2,168 shares of common stock on August 8, 2026. Following this, she holds 7,748 common shares directly and 19,423 common shares indirectly through a trust for her benefit.

Positive

  • None.

Negative

  • None.
Insider Chao Catherine T.
Role Director
Type Security Shares Price Value
Exercise Restricted Stock Units F1, F3 2,168 $0.00 $0.00
Exercise Common Stock F1 2,168 -- --
holding Common Stock F2 -- -- --
Holdings After Transaction: Restricted Stock Units — 2,168 shares (Direct); Common Stock — 7,748 shares (Direct); Common Stock — 19,423 shares (Indirect, by Trust)
Footnotes (3)
  1. F1. Restricted stock units convert into the Issuer's common stock on a one-for-one basis.
  2. F2. These shares are held in a trust for the benefit of the reporting person, who also serves as sole trustee.
  3. F3. 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 RSUs converted into common stock on August 8, 2026
Common Shares Acquired from RSUs 2,168 shares Common stock received upon RSU conversion
Direct Common Shares After Transaction 7,748 shares Direct ownership following RSU conversion
Indirect Common Shares in Trust 19,423 shares Indirect ownership held by trust for reporting person’s benefit
Derivative Exercises Reported 1 transaction Exercise or conversion of derivative security (RSUs)
RSU Conversion Ratio 1-for-1 Restricted stock units convert into common stock on a one-for-one basis
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.
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.
indirect ownership financial
"These shares are held in a trust for the benefit of the reporting person"
trust financial
"These shares are held in a trust for the benefit of the reporting person"
A trust is a legal setup in which one party (the trustee) holds and manages assets—like cash, stocks or property—on behalf of other people (beneficiaries) according to instructions from the person who created it (the grantor). Think of it as a locked box with a keyholder who must follow written rules; for investors it matters because trusts influence who controls and benefits from assets, affect taxes and succession, and can change how quickly or transparently shares are bought, sold or voted.

FAQ

What transaction did Westlake Corp (WLK) director Catherine T. Chao report?

Catherine T. Chao reported the vesting and exercise of 2,168 Restricted Stock Units into 2,168 shares of Westlake Corp common stock on August 8, 2026, as shown in the Form 4 filing.

How many Westlake Corp (WLK) shares did Catherine T. Chao acquire in this Form 4?

She acquired 2,168 shares of common stock upon the exercise of 2,168 Restricted Stock Units, which convert into the issuer’s common stock on a one-for-one basis according to the filing footnotes.

What are Catherine T. Chao’s direct and indirect WLK holdings after the reported transactions?

After the transactions, she holds 7,748 shares of Westlake Corp common stock directly and 19,423 shares indirectly in a trust for her benefit, where she serves as sole trustee.

Were the reported Westlake Corp (WLK) transactions under a Rule 10b5-1 plan?

The Form 4 indicates the Rule 10b5-1 trading plan checkbox is not affirmed (set to false), so the filing does not state that these transactions occurred pursuant to a Rule 10b5-1 plan.

What do the Restricted Stock Units in the WLK Form 4 convert into?

The Restricted Stock Units convert into Westlake Corp common stock on a one-for-one basis. In this filing, 2,168 RSUs converted into 2,168 common shares upon vesting and exercise.

What is the nature of Catherine T. Chao’s indirect ownership of Westlake Corp (WLK) shares?

Her indirect ownership consists of 19,423 common shares held in a trust for her benefit. She is disclosed as the sole trustee of this trust, according to the Form 4 footnote.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google
Add on Google
Learn about SEC filing dates
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*
Chao Catherine T.

(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)
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)7,748D
Common Stock19,423Iby Trust(2)
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 (3) (3)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. These shares are held in a trust for the benefit of the reporting person, who also serves as sole trustee.
3. On August 8, 2025 the reporting person was granted 2,168 restricted stock units vesting on the first anniversary of the grant date.
Catherine Chao 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)