Mark Steven Bender - 27 Feb 2026 Form 4 Insider Report for WESTLAKE CORP (WLK)

Reporting relationship: EVP & CFO
Issuer ticker: WLK
Reported as of: 27 Feb 2026
Net transaction value: -$2,033,501
SEC form: 4
Accepted by SEC: 02 Mar 2026, 11:35:03 UTC
Prior SEC filing: 23 Feb 2026
Next SEC filing: 30 Mar 2026
Source filing: View source filing
Reporting owner signature: M. Steven Bender by J Feng POA

Key filing fact

Mark Steven Bender filed Form 4 for WESTLAKE CORP (WLK) on 02 Mar 2026.

Key facts

This page summarizes Mark Steven Bender's Form 4 filing for WESTLAKE CORP (WLK).
7 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 02 Mar 2026, 11:35.

Change

Previous filing in this sequence was filed on 23 Feb 2026.
Current net transaction value: -$2,033,501.

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

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

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: 02 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

WLK transaction

Common Stock

Options Exercise

Transaction value: $407,972
Shares: +6,199
Change %: +10%
Price: $65.81
Shares after: 68,041
Date: 27 Feb 2026
Ownership: Direct

WLK transaction

Common Stock

Options Exercise

Transaction value: $561,977
Shares: +6,494
Change %: +9.5%
Price: $86.54
Shares after: 74,535
Date: 27 Feb 2026
Ownership: Direct

WLK transaction

Common Stock

Disposed to Issuer

Transaction value: $1,246,453
Shares: -12,693
Change %: -17%
Price: $98.20
Shares after: 61,842
Date: 27 Feb 2026
Ownership: Direct

WLK transaction

Common Stock

Sale

Transaction value: $1,714,259
Shares: -16,988
Change %: -27%
Price: $100.91
Shares after: 44,854
Date: 27 Feb 2026
Ownership: Direct
Footnotes: F1

WLK transaction

Common Stock

Sale

Transaction value: $42,738
Shares: -421
Change %: -0.94%
Price: $101.52
Shares after: 44,433
Date: 27 Feb 2026
Ownership: Direct

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

WLK transaction Derivative

Employee Option (right to buy)

Options Exercise

Transaction value: $0
Shares: -6,199
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 27 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 6,199
Exercise price: $65.81
Footnotes: F2

WLK transaction Derivative

Employee Option (right to buy)

Options Exercise

Transaction value: $0
Shares: -6,494
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 27 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 6,494
Exercise price: $86.54
Footnotes: 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

Weighted average price. These shares were sold in multiple transactions at prices ranging from $100.38 to $101.36 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

Footnote F2

The stock options are exercisable in three installments of 33%. 33% and 34% on February 14, 2021, 2022 and 2023, respectively.

Footnote F3

The stock options are exercisable in three installments of 33%, 33% and 34% on February 19, 2022, 2023 and 2024, respectively.