WLK Insider Trading

Westlake Corp · full profile →Last filing Jun 15, 2026
Net Selling · 180d
Open-Market Buys (180d)
$0
0 insiders
Open-Market Sells (180d)
$4.1M
2 insiders
Net Insider Flow
-$4.1M
open market, 180d
Reporting Insiders
2
4 P/S transactions
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Build on these Form 4 transactions

The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.

Recent Form 4 Transactions

100 shown
DateInsiderRoleActionSharesPriceValue
Jun 15, 2026Baksht JonathanSVP and CFOGrant(A)21K$0
May 13, 2026Bender Mark StevenEVP & CFOTax withholding(F)5K$97.34$514K
May 12, 2026Bender Mark StevenEVP & CFOOption exercise(M)13K$0
May 12, 2026Bender Mark StevenEVP & CFOOption exercise(M)13K$0
Apr 2, 2026Powers Brian JohnSVP, PEM Segment HeadGrant(A)2K$0
Mar 27, 2026Bender Mark StevenEVP & CFOSell(S)16K$112.54$1.8M
Mar 27, 2026Buesinger Robert F.EVP, PEM Segment HeadSell(S)4K$115.25$461K
Feb 27, 2026Bender Mark StevenEVP & CFOOption exercise(M)6K$65.81$408K
Feb 27, 2026Bender Mark StevenEVP & CFOSell(S)421$101.52$43K
Feb 27, 2026Bender Mark StevenEVP & CFOSell(S)17K$100.91$1.7M
Feb 27, 2026Bender Mark StevenEVP & CFODisposed to issuer(D)13K$98.20$1.2M
Feb 27, 2026Bender Mark StevenEVP & CFOOption exercise(M)6K$86.54$562K
Feb 27, 2026Bender Mark StevenEVP & CFOOption exercise(M)6K$0
Feb 27, 2026Bender Mark StevenEVP & CFOOption exercise(M)6K$0
Feb 20, 2026Patel Bhavesh V.DirectorGrant(A)2K$0
Feb 20, 2026Chao JamesSenior Chairman, DirectorTax withholding(F)2K$94.10$148K
Feb 20, 2026Chao JamesSenior Chairman, DirectorGrant(A)27K$0
Feb 20, 2026Chao JamesSenior Chairman, DirectorGrant(A)7K$0
Feb 20, 2026Chao AlbertExecutive Chairman, DirectorTax withholding(F)3K$94.10$235K
Feb 20, 2026Chao AlbertExecutive Chairman, DirectorGrant(A)55K$0
Feb 20, 2026Chao AlbertExecutive Chairman, DirectorGrant(A)15K$0
Feb 20, 2026Chao John Tsung-chenDirectorTax withholding(F)91$94.10$9K
Feb 20, 2026Chao John Tsung-chenDirectorGrant(A)2K$0
Feb 20, 2026Chao John Tsung-chenDirectorGrant(A)1K$0
Feb 20, 2026Chao John Tsung-chenDirectorGrant(A)4K$0
Feb 20, 2026Bender Mark StevenEVP & CFOTax withholding(F)445$94.10$42K
Feb 20, 2026Bender Mark StevenEVP & CFOGrant(A)28K$0
Feb 20, 2026Bender Mark StevenEVP & CFOGrant(A)8K$0
Feb 20, 2026Buesinger Robert F.EVP, PEM Segment HeadTax withholding(F)326$94.10$31K
Feb 20, 2026Buesinger Robert F.EVP, PEM Segment HeadGrant(A)5K$0
Feb 20, 2026Buesinger Robert F.EVP, PEM Segment HeadGrant(A)19K$0
Feb 20, 2026Ederington L. BenjaminEVP, Legal & External AffairsTax withholding(F)357$94.10$34K
Feb 20, 2026Ederington L. BenjaminEVP, Legal & External AffairsGrant(A)26K$0
Feb 20, 2026Ederington L. BenjaminEVP, Legal & External AffairsGrant(A)7K$0
Feb 20, 2026Gilson Jean-MarcPresident and CEOGrant(A)109K$0
Feb 20, 2026Gilson Jean-MarcPresident and CEOGrant(A)30K$0
Feb 20, 2026Holy Jeffrey AdamVP and CAOTax withholding(F)81$94.10$8K
Feb 20, 2026Holy Jeffrey AdamVP and CAOGrant(A)1K$0
Feb 20, 2026Holy Jeffrey AdamVP and CAOGrant(A)3K$0
Feb 20, 2026Holy Jeffrey AdamVP and CAOGrant(A)4K$0
Feb 20, 2026Szwejbka Scott ThomasSVP, HIP Segment HeadTax withholding(F)91$94.10$9K
Feb 20, 2026Szwejbka Scott ThomasSVP, HIP Segment HeadGrant(A)4K$0
Feb 20, 2026Szwejbka Scott ThomasSVP, HIP Segment HeadGrant(A)15K$0
Feb 19, 2026Chao JamesSenior Chairman, DirectorGrant(A)4K$0
Feb 19, 2026Chao AlbertExecutive Chairman, DirectorGrant(A)6K$0
Feb 19, 2026Chao John Tsung-chenDirectorGrant(A)213$0
Feb 19, 2026Bender Mark StevenEVP & CFOGrant(A)2K$0
Feb 19, 2026Buesinger Robert F.EVP, PEM Segment HeadGrant(A)1K$0
Feb 19, 2026Ederington L. BenjaminEVP, Legal & External AffairsGrant(A)1K$0
Feb 19, 2026Holy Jeffrey AdamVP and CAOGrant(A)264$0
Feb 19, 2026Szwejbka Scott ThomasSVP, HIP Segment HeadGrant(A)365$0
Feb 18, 2026Bender Mark StevenEVP & CFOTax withholding(F)1K$98.95$120K
Feb 18, 2026Buesinger Robert F.EVP, PEM Segment HeadTax withholding(F)903$98.95$89K
Feb 18, 2026Chao AlbertExecutive Chairman, DirectorTax withholding(F)5K$98.95$504K
Feb 18, 2026Chao John Tsung-chenDirectorTax withholding(F)242$98.95$24K
Feb 18, 2026Chao JamesSenior Chairman, DirectorTax withholding(F)3K$98.95$264K
Feb 18, 2026Ederington L. BenjaminEVP, Legal & External AffairsTax withholding(F)978$98.95$97K
Feb 18, 2026Holy Jeffrey AdamVP and CAOTax withholding(F)213$98.95$21K
Feb 18, 2026Szwejbka Scott ThomasSVP, HIP Segment HeadTax withholding(F)295$98.95$29K
Feb 17, 2026Bender Mark StevenEVP & CFOOption exercise(M)5K$0
Feb 17, 2026Bender Mark StevenEVP & CFOOption exercise(M)5K$0
Feb 17, 2026Buesinger Robert F.EVP, PEM Segment HeadOption exercise(M)3K$0
Feb 17, 2026Buesinger Robert F.EVP, PEM Segment HeadOption exercise(M)3K$0
Feb 17, 2026Chao AlbertExecutive Chairman, DirectorOption exercise(M)17K$0
Feb 17, 2026Chao AlbertExecutive Chairman, DirectorOption exercise(M)17K$0
Feb 17, 2026Chao John Tsung-chenDirectorOption exercise(M)570$0
Feb 17, 2026Chao John Tsung-chenDirectorOption exercise(M)570$0
Feb 17, 2026Chao JamesSenior Chairman, DirectorOption exercise(M)10K$0
Feb 17, 2026Chao JamesSenior Chairman, DirectorOption exercise(M)10K$0
Feb 17, 2026Ederington L. BenjaminEVP, Legal & External AffairsOption exercise(M)4K$0
Feb 17, 2026Ederington L. BenjaminEVP, Legal & External AffairsOption exercise(M)4K$0
Feb 17, 2026Holy Jeffrey AdamVP and CAOOption exercise(M)706$0
Feb 17, 2026Holy Jeffrey AdamVP and CAOOption exercise(M)706$0
Feb 17, 2026Szwejbka Scott ThomasSVP, HIP Segment HeadOption exercise(M)977$0
Feb 17, 2026Szwejbka Scott ThomasSVP, HIP Segment HeadOption exercise(M)977$0
Dec 22, 2025Chao AlbertExecutive Chairman, DirectorSell(S)521$74.44$39K
Dec 22, 2025Chao AlbertExecutive Chairman, DirectorSell(S)10K$72.82$707K
Dec 22, 2025Chao AlbertExecutive Chairman, DirectorOption exercise(M)82K$44.42$3.6M
Dec 22, 2025Chao AlbertExecutive Chairman, DirectorSell(S)31K$73.80$2.3M
Dec 22, 2025Chao AlbertExecutive Chairman, DirectorOption exercise(M)82K$0
Dec 10, 2025Cregg Roger ADirectorOption exercise(M)1K
Dec 10, 2025Cregg Roger ADirectorOption exercise(M)1K$0
Oct 2, 2025Szwejbka Scott ThomasSVP, HIP Segment HeadTax withholding(F)4K$76.70$295K
Oct 1, 2025Szwejbka Scott ThomasSVP, HIP Segment HeadOption exercise(M)11K$0
Oct 1, 2025Szwejbka Scott ThomasSVP, HIP Segment HeadOption exercise(M)11K$0
Aug 28, 2025Chao JamesSenior Chairman, DirectorGift(G)15K$0
Aug 9, 2025McCollum Mark ADirectorOption exercise(M)1K$0
Aug 9, 2025McCollum Mark ADirectorOption exercise(M)1K
Aug 9, 2025Northcutt R BruceDirectorOption exercise(M)1K
Aug 9, 2025Northcutt R BruceDirectorOption exercise(M)1K$0
Aug 9, 2025Sheets Jeffrey WayneDirectorOption exercise(M)1K
Aug 9, 2025Sheets Jeffrey WayneDirectorOption exercise(M)1K$0
Aug 9, 2025Lubel Kimberly SDirectorOption exercise(M)1K
Aug 9, 2025Lubel Kimberly SDirectorOption exercise(M)1K$0
Aug 9, 2025Graff Michael JDirectorOption exercise(M)1K
Aug 9, 2025Graff Michael JDirectorOption exercise(M)1K$0
Aug 9, 2025Chao David Tsung-HungDirectorOption exercise(M)1K
Aug 9, 2025Chao David Tsung-HungDirectorOption exercise(M)1K$0
Aug 9, 2025Sabat Carolyn ChaoDirectorOption exercise(M)1K
Aug 9, 2025Sabat Carolyn ChaoDirectorOption exercise(M)1K$0

Data Source

Insider transactions sourced from SEC EDGAR Form 4 filings, normalized within minutes of acceptance. "Buy"/"Sell" mark open-market transactions (codes P/S), the tradeable signal. Awards, option exercises and tax-withholding are shown with their raw code. All data is public domain.

Coverage: Form 4 filings indexed 2021-03-292026-07-14. Earlier history is backfilling; this window widens as it deepens.

Programmatic access via the Arkolith API & MCP server (insider.transactions, insider.company).