Key facts
- This page summarizes Jean-Marc Gilson's Form 4 filing for WESTLAKE CORP (WLK).
- 2 reported transactions and 2 derivative rows are listed below.
- Accepted by SEC: 23 Feb 2026, 14:44.
Jean-Marc Gilson - 20 Feb 2026 Form 4 Insider Report for WESTLAKE CORP (WLK)
- Reporting relationship
- President and CEO
- Issuer ticker
- WLK
- Reported as of
- 20 Feb 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 23 Feb 2026, 14:44:53 UTC
- Prior SEC filing
- 29 Aug 2025
- Next SEC filing
- 30 Apr 2026
- Source filing
- View source filing
- Reporting owner signature
- Jea-Marc Gilson by J. Feng, POA
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Jean-Marc Gilson filed Form 4 for WESTLAKE CORP (WLK) on 23 Feb 2026.
Change
- Previous filing in this sequence was filed on 29 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 0002030037
Primary reporting owner
Gilson Jean-Marc
- Relationship
- President and CEO
- Address
- 2801 POST OAK BLVD., SUITE 600, HOUSTON
- Signature
- Jea-Marc Gilson by J. Feng, POA
- Signature date
- 23 Feb 2026
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
WLK
transaction
Derivative
Employee Option (right to buy)
Award
- Transaction value
- $0
- Shares
- +109,139
- Change %
- Price
- $0.000000
- Shares after
- 109,139
- Date
- 20 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 109,139
- Exercise price
- $94.48
- Footnotes
- F1
WLK
transaction
Derivative
Restricted Stock Units
Award
- Transaction value
- $0
- Shares
- +29,784
- Change %
- Price
- $0.000000
- Shares after
- 29,784
- Date
- 20 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 29,784
- Exercise price
- Footnotes
- F2, 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
The stock options are excercisable in three installments of 33%, 33% and 34% on February 20, 2027, 2028 and 2029, respectively.
Footnote F2
Each restricted stock unit ("RSU") represents a contingent right to recieve one share of the Issuer's common stock.
Footnote F3
All of the RSUs will vest on February 20, 2029.