Key facts
- This page summarizes Chao Catherine T.'s Form 4 filing for WESTLAKE CORP (WLK).
- 2 reported transactions and 1 derivative row are listed below.
- Accepted by SEC: 10 Aug 2026, 13:50.
Chao Catherine T. - 08 Aug 2026 Form 4 Insider Report for WESTLAKE CORP (WLK)
- Reporting relationship
- Director
- Issuer ticker
- WLK
- Reported as of
- 08 Aug 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 10 Aug 2026, 13:50:35 UTC
- Prior SEC filing
- 11 Aug 2025
- Next SEC filing
- 17 Aug 2026
- Source filing
- View source filing
- Reporting owner signature
- Catherine Chao by J Feng POA
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Chao Catherine T. filed Form 4 for WESTLAKE CORP (WLK) on 10 Aug 2026.
Change
- Previous filing in this sequence was filed on 11 Aug 2025.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001974884
Primary reporting owner
Chao Catherine T.
- Relationship
- Director
- Address
- 2801 POST OAK BLVD., STE. 600, HOUSTON
- Signature
- Catherine Chao by J Feng POA
- Signature date
- 10 Aug 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
WLK
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +2,168
- Change %
- +39%
- Price
- Shares after
- 7,748
- Date
- 08 Aug 2026
- Ownership
- Direct
- Footnotes
- F1
WLK
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 19,423
- Date
- 08 Aug 2026
- Ownership
- by Trust
- Footnotes
- F2
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
WLK
transaction
Derivative
Restricted Stock Units
Options Exercise
- Transaction value
- Shares
- -2,168
- Change %
- -50%
- Price
- $0.000000*
- Shares after
- 2,168
- Date
- 08 Aug 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 2,168
- Exercise price
- Footnotes
- F1, F3
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 3 footnotes
Footnote F1
Restricted stock units convert into the Issuer's common stock on a one-for-one basis.
Footnote F2
These shares are held in a trust for the benefit of the reporting person, who also serves as sole trustee.
Footnote F3
On August 8, 2025 the reporting person was granted 2,168 restricted stock units vesting on the first anniversary of the grant date.