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Westlake Corp. (WLK)

Westlake Corp. (WLK) Insider Trading

Directors, officers and holders of more than 10% of WLK report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.

Recent Form 4 transactions

The 50 most recent of 225 transactions on file: 0 with code P, 5 with code S and 45 with other codes.

DateInsiderCodeShares
Aug 31, 2026Darby TommyA Award1,791
Aug 14, 2026Patel Bhavesh V.A Award2,184
Aug 14, 2026Sheets Jeffrey WayneA Award2,184
Aug 14, 2026Chao Catherine T.A Award2,184
Aug 14, 2026Graff Michael JA Award2,184
Aug 14, 2026CREGG ROGER AA Award2,184
Aug 14, 2026Sabat Carolyn ChaoA Award2,184
Aug 14, 2026MCCOLLUM MARK AA Award2,184
Aug 14, 2026NORTHCUTT R BRUCEA Award2,184
Aug 14, 2026Lubel Kimberly SA Award2,184
Aug 14, 2026Chao David Tsung-HungA Award2,184
Aug 11, 2026Chao AlbertS Sale7,489
Aug 11, 2026Chao AlbertM Exercise38,873
Aug 11, 2026Chao AlbertS Sale31,384
Aug 11, 2026Chao AlbertM Exercise38,873
Aug 8, 2026Chao Catherine T.M Exercise2,168
Aug 8, 2026Graff Michael JM Exercise2,168
Aug 8, 2026Lubel Kimberly SM Exercise2,168
Aug 8, 2026Lubel Kimberly SM Exercise2,168
Aug 8, 2026NORTHCUTT R BRUCEM Exercise2,168
Aug 8, 2026MCCOLLUM MARK AM Exercise2,168
Aug 8, 2026Chao Catherine T.M Exercise2,168
Aug 8, 2026Sabat Carolyn ChaoM Exercise2,168
Aug 8, 2026MCCOLLUM MARK AM Exercise2,168
Aug 8, 2026CREGG ROGER AM Exercise2,168
Aug 8, 2026Chao David Tsung-HungM Exercise2,168
Aug 8, 2026Sheets Jeffrey WayneM Exercise2,168
Aug 8, 2026NORTHCUTT R BRUCEM Exercise2,168
Aug 8, 2026Graff Michael JM Exercise2,168
Aug 8, 2026Sheets Jeffrey WayneM Exercise2,168
Aug 8, 2026Sabat Carolyn ChaoM Exercise2,168
Aug 8, 2026Chao David Tsung-HungM Exercise2,168
Aug 8, 2026CREGG ROGER AM Exercise2,168
Jun 15, 2026Baksht JonathanA Award20,580
May 13, 2026Bender Mark StevenF Tax Payment5,284
May 12, 2026Bender Mark StevenM Exercise13,164
May 12, 2026Bender Mark StevenM Exercise13,164
Apr 2, 2026Powers Brian JohnA Award1,961
Mar 27, 2026Bender Mark StevenS Sale16,413
Feb 27, 2026Bender Mark StevenS Sale421
Feb 27, 2026Bender Mark StevenS Sale16,988
Feb 27, 2026Bender Mark StevenD Disposition12,693
Feb 27, 2026Bender Mark StevenM Exercise6,494
Feb 27, 2026Bender Mark StevenM Exercise6,199
Feb 27, 2026Bender Mark StevenM Exercise6,199
Feb 27, 2026Bender Mark StevenM Exercise6,494
Feb 20, 2026Holy Jeffrey AdamA Award4,394
Feb 20, 2026Holy Jeffrey AdamF Tax Payment81
Feb 20, 2026Chao JamesA Award27,382
Feb 20, 2026Chao JamesF Tax Payment1,569

The full Form 4 history is on the WLK company page (Insider Trades card, View all).

Questions about this data

Which insider transactions are open-market trades?

Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.

How quickly are insider trades reported?

A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.

Who has to file Form 4?

Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.

Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.