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Westlake

Westlake (NYSE: WLK) insider transactions

In the twelve months to 10 November 2026, executives and directors of Westlake reported 9 open-market sales of 117,531 shares ($10.2m) and 0 open-market purchases, by 3 people, according to the Form 4 filings they submitted to the SEC.

Latest transactions

The 20 most recent transactions in Westlake shares reported on Form 4
DateInsiderRoleTransactionSharesPriceHeld afterFiling
11 August 2026Chao AlbertExecutive ChairmanOption exercise+38,873$61.87681,753Form 4
11 August 2026Chao AlbertExecutive ChairmanOpen-market sale−7,489$79.70674,264Form 4
11 August 2026Chao AlbertExecutive ChairmanOpen-market sale−31,384$80.42642,880Form 4
8 August 2026Chao Catherine T.DirectorOption exercise+2,168—7,748Form 4
8 August 2026Chao David Tsung-HungDirectorOption exercise+2,168—11,080Form 4
8 August 2026Cregg Roger ADirectorOption exercise+2,168—3,507Form 4
8 August 2026Graff Michael JDirectorOption exercise+2,168—23,310Form 4
8 August 2026Lubel Kimberly SDirectorOption exercise+2,168—13,821Form 4
8 August 2026McCollum Mark ADirectorOption exercise+2,168—11,824Form 4
8 August 2026Northcutt R BruceDirectorOption exercise+2,168—23,351Form 4
8 August 2026Sabat Carolyn ChaoDirectorOption exercise+2,168—5,748Form 4
8 August 2026Sheets Jeffrey WayneDirectorOption exercise+2,168—14,927Form 4
13 May 2026Bender Mark StevenEVP & CFOShares withheld for tax−5,284$97.3435,895Form 4
12 May 2026Bender Mark StevenEVP & CFOOption exercise+13,164—41,179Form 4
27 March 2026Buesinger Robert F.EVP, PEM Segment HeadOpen-market sale−4,000$115.2534,482Form 4
27 March 2026Bender Mark StevenEVP & CFOOpen-market sale−16,413$112.5428,015Form 4
27 February 2026Bender Mark StevenEVP & CFOOption exercise+6,199$65.8168,041Form 4
27 February 2026Bender Mark StevenEVP & CFOOption exercise+6,494$86.5474,535Form 4
27 February 2026Bender Mark StevenEVP & CFOReturned to the company−12,693$98.2061,842Form 4
27 February 2026Bender Mark StevenEVP & CFOOpen-market sale−16,988$100.9144,854Form 4

Names appear as in the filing, surname first. A dash in the price column means the filing reports none, as in grants and gifts.

How to read the table

Only open-market purchases and sales are trades the insider chose to make at the market price, and they are the ones counted in the summary above. Grants, option exercises and shares withheld for tax come from pay plans. A sale marked as a 10b5-1 plan was scheduled in advance under a written plan.

Where each row comes from

From the Form 4 that each executive, director or large shareholder must file with the SEC within two business days of a transaction, read up to 10 November 2026. Each row links to its filing on EDGAR. Only transactions in shares are listed, not derivatives, and amended filings are left out. The accounts of the company are on the Westlake page; the method, in data sources.

Information prepared from the Form 4 filings submitted to the SEC, for information purposes only. It is not financial advice or a recommendation to buy or sell. Updated on 12 November 2026.