MetaCap

Westlake Insider Trades

NYSE: WLKIndustrialsMajor ChemicalsUSD

62.29-0.02 (-0.03%)

At close: Oct 9, 4:00 PM ET · Delayed 15 min

Last 12 months

Purchases
0 · $0
Sales
6 · $7.19M
Shares bought / sold
0 / 76.69K
Net activity
Net selling $7.2 million

Westlake insider activity

Over the last 12 months, Westlake insiders reported 41 transactions on SEC Form 4: 0 open-market purchases and 6 sales. Insiders bought $0 and sold $7.2 million worth of stock, for net insider selling of $7.2 million. The largest seller was Bender Mark Steven, with $3.6 million in reported sales.

The most recent filing shows Chao Albert (Executive Chairman) reporting a transaction in 38,873 shares at $61.87 on Aug 11, 2026. Insider sales are common for compensation, tax and diversification reasons, while open-market purchases are rarer; tracking both helps put WLK's ownership changes in context.

Summary generated from market data by MetaCap's automated system. Methodology

WLK insider transactions

Westlake insider transactions
DateInsiderTypeSharesValueFiling
Aug 11, 2026Chao AlbertExecutive ChairmanSale31,384$2.52MForm 4
Aug 11, 2026Chao AlbertExecutive ChairmanSale7,489$596.87KForm 4
Aug 11, 2026Chao AlbertExecutive ChairmanOption exercise38,873$2.40MForm 4
Aug 8, 2026Chao David Tsung-HungDirectorOption exercise2,168—Form 4
Aug 8, 2026Lubel Kimberly SDirectorOption exercise2,168—Form 4
Aug 8, 2026NORTHCUTT R BRUCEDirectorOption exercise2,168—Form 4
Aug 8, 2026Chao Catherine T.DirectorOption exercise2,168—Form 4
Aug 8, 2026Sabat Carolyn ChaoDirectorOption exercise2,168—Form 4
Aug 8, 2026CREGG ROGER ADirectorOption exercise2,168—Form 4
Aug 8, 2026Graff Michael JDirectorOption exercise2,168—Form 4
Aug 8, 2026Sheets Jeffrey WayneDirectorOption exercise2,168—Form 4
Aug 8, 2026MCCOLLUM MARK ADirectorOption exercise2,168—Form 4
May 13, 2026Bender Mark StevenEVP & CFOTax withholding5,284$514.34KForm 4
May 12, 2026Bender Mark StevenEVP & CFOOption exercise13,164—Form 4
Mar 27, 2026Bender Mark StevenEVP & CFOSale16,413$1.85MForm 4
Mar 27, 2026Buesinger Robert F.EVP, PEM Segment HeadSale4,000$461.00KForm 4
Feb 27, 2026Bender Mark StevenEVP & CFOSale421$42.74KForm 4
Feb 27, 2026Bender Mark StevenEVP & CFOSale16,988$1.71MForm 4
Feb 27, 2026Bender Mark StevenEVP & CFODisposition12,693$1.25MForm 4
Feb 27, 2026Bender Mark StevenEVP & CFOOption exercise6,494$561.98KForm 4
Feb 27, 2026Bender Mark StevenEVP & CFOOption exercise6,199$407.97KForm 4
Feb 20, 2026Chao JamesSenior ChairmanTax withholding1,569$147.64KForm 4
Feb 20, 2026Chao AlbertExecutive ChairmanTax withholding2,501$235.35KForm 4
Feb 20, 2026Ederington L. BenjaminEVP, Legal & External AffairsTax withholding357$33.59KForm 4
Feb 20, 2026Buesinger Robert F.EVP, PEM Segment HeadTax withholding326$30.68KForm 4
Feb 20, 2026Chao John Tsung-chenDirectorTax withholding91$8.56KForm 4
Feb 20, 2026Bender Mark StevenEVP & CFOTax withholding445$41.87KForm 4
Feb 20, 2026Holy Jeffrey AdamVP and CAOTax withholding81$7.62KForm 4
Feb 20, 2026Szwejbka Scott ThomasSVP, HIP Segment HeadTax withholding91$8.56KForm 4
Feb 19, 2026Chao JamesSenior ChairmanAward3,884—Form 4
Feb 19, 2026Chao AlbertExecutive ChairmanAward6,193—Form 4
Feb 19, 2026Ederington L. BenjaminEVP, Legal & External AffairsAward1,425—Form 4
Feb 19, 2026Buesinger Robert F.EVP, PEM Segment HeadAward1,301—Form 4
Feb 19, 2026Chao John Tsung-chenDirectorAward213—Form 4
Feb 19, 2026Bender Mark StevenEVP & CFOAward1,777—Form 4
Feb 19, 2026Holy Jeffrey AdamVP and CAOAward264—Form 4
Feb 19, 2026Szwejbka Scott ThomasSVP, HIP Segment HeadAward365—Form 4
Feb 18, 2026Holy Jeffrey AdamVP and CAOTax withholding213$21.08KForm 4
Feb 18, 2026Szwejbka Scott ThomasSVP, HIP Segment HeadTax withholding295$29.19KForm 4
Feb 17, 2026Holy Jeffrey AdamVP and CAOOption exercise706—Form 4
Feb 17, 2026Szwejbka Scott ThomasSVP, HIP Segment HeadOption exercise977—Form 4
Feb 16, 2022Bender Mark StevenEVP & CFOTax withholding1,171$122.91KForm 4

Transaction codes follow SEC Form 4: P = open-market purchase, S = open-market sale, A = grant or award, M = option exercise, F = shares withheld for taxes. About Form 4

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