Key facts
- This page summarizes Mark Steven Bender's Form 4 filing for WESTLAKE CORP (WLK).
- 3 reported transactions and 1 derivative row are listed below.
- Accepted by SEC: 14 May 2026, 12:33.
Mark Steven Bender - 12 May 2026 Form 4 Insider Report for WESTLAKE CORP (WLK)
- Reporting relationship
- EVP & CFO
- Issuer ticker
- WLK
- Reported as of
- 12 May 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 14 May 2026, 12:33:47 UTC
- Prior SEC filing
- 30 Mar 2026
- Source filing
- View source filing
- Reporting owner signature
- M. Steven Bender by J Feng POA
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Mark Steven Bender filed Form 4 for WESTLAKE CORP (WLK) on 14 May 2026.
Change
- Previous filing in this sequence was filed on 30 Mar 2026.
- 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 0001330417
Primary reporting owner
Bender Mark Steven
- Relationship
- EVP & CFO
- Address
- 2801 POST OAK BLVD., STE. 600, HOUSTON
- Signature
- M. Steven Bender by J Feng POA
- Signature date
- 14 May 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
- +13,164
- Change %
- +47%
- Price
- $0.000000*
- Shares after
- 41,179
- Date
- 12 May 2026
- Ownership
- Direct
- Footnotes
- F1
WLK
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -5,284
- Change %
- -13%
- Price
- $97.34*
- Shares after
- 35,895
- Date
- 13 May 2026
- Ownership
- Direct
- Footnotes
- F3
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
- -13,164
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 12 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 13,164
- Exercise price
- Footnotes
- F1, F2
* 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 ("RSUs") convert into the Issuer's common stock on a one-for-one basis.
Footnote F2
On May 12, 2023, the reporting person was granted 13,164 RSUs vesting on the third anniversay of the grant date.
Footnote F3
Shares otherwise issuable were withheld to satisfy tax obligations arising out of the vesting of the reporting persons RSUs.