Albert Chao - 11 Aug 2026 Form 4 Insider Report for WESTLAKE CORP (WLK)

Reporting relationship: Executive Chairman, Director
Issuer ticker: WLK
Reported as of: 11 Aug 2026
Net transaction value: -$3,120,775
SEC form: 4
Accepted by SEC: 11 Aug 2026, 17:45:00 UTC
Prior SEC filing: 23 Feb 2026
Source filing: View source filing
Reporting owner signature: Albert Chao by J Feng POA

Key filing fact

Albert Chao filed Form 4 for WESTLAKE CORP (WLK) on 11 Aug 2026.

Key facts

This page summarizes Albert Chao's Form 4 filing for WESTLAKE CORP (WLK).
4 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 11 Aug 2026, 17:45.

Change

Previous filing in this sequence was filed on 23 Feb 2026.
Current net transaction value: -$3,120,775.

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 0001299403 Primary reporting owner

Chao Albert

Relationship: Executive Chairman, Director
Address: 2801 POST OAK BLVD., STE. 600, HOUSTON
Signature: Albert Chao by J Feng POA
Signature date: 11 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: +38,873
Change %: +6%
Price: $61.86^*
Shares after: 681,753
Date: 11 Aug 2026
Ownership: Direct

WLK transaction

Common Stock

Sale

Transaction value: $596,873
Shares: -7,489
Change %: -1.1%
Price: $79.70
Shares after: 674,264
Date: 11 Aug 2026
Ownership: Direct
Footnotes: F1

WLK transaction

Common Stock

Sale

Transaction value: $2,523,901
Shares: -31,384
Change %: -4.7%
Price: $80.42
Shares after: 642,880
Date: 11 Aug 2026
Ownership: Direct
Footnotes: F2

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
Shares: -38,873
Change %: -50%
Price: $0.000000^*
Shares after: 38,873
Date: 11 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 38,873
Exercise price: $61.86
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 ranging from $79.02 to $80.01 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

Weighted average price. These shares were sold in multiple transactions ranging from $80.10 to $80.86 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 F3

The stock options are exercisable in three installments of 33%, 33% and 34% on February 17, 2018, 2019 and 2020, respectively.