Westlake Corporation (WLK) Insider Trading

Over the last 3 months, WLK insiders made 0 open-market buys and 2 sales, a net sale of -$2.3M (SEC Form 4). Over the last 6 months, 238 institutions increased and 205 reduced their position (13F).

Insider Activity

Sentiment
0/100
Buys (3m)
0
Sells (3m)
2
Net (3m)
-$2.3M
Insider trades by month Buys Sells
May
Nov
Dec
Jun
Dec
Mar
Context3-month price -18.6%Institutions mixed (13F)
DateInsiderTypeSharesPrice
May 14, 2026Bender Mark Stevenofficer: EVP & CFOTax5,284$97.34
May 14, 2026Bender Mark Stevenofficer: EVP & CFOOption13,164
Apr 6, 2026Powers Brian Johnofficer: SVP, PEM Segment HeadGrant1,961
Mar 31, 2026Buesinger Robert F.officer: EVP, PEM Segment HeadSell4,000$115.25
Mar 30, 2026Bender Mark Stevenofficer: EVP & CFOSell16,413$112.53
Mar 6, 2026Bender Mark Stevenofficer: EVP & CFOTax1,171$104.96
Mar 2, 2026Bender Mark Stevenofficer: EVP & CFOOption6,199$65.81
Mar 2, 2026Bender Mark Stevenofficer: EVP & CFOOption6,494$86.54
Mar 2, 2026Bender Mark Stevenofficer: EVP & CFOSell421$101.52
Mar 2, 2026Bender Mark Stevenofficer: EVP & CFOSell16,988$100.91
Feb 24, 2026Patel Bhavesh V.directorGrant1,852
Feb 23, 2026Buesinger Robert F.officer: EVP, PEM Segment HeadGrant5,281
Feb 23, 2026Chao Jamesdirector, officer: Senior ChairmanGrant27,382$94.48
Feb 23, 2026Chao Albertdirector, officer: Executive ChairmanGrant14,945
Feb 23, 2026Ederington L. Benjaminofficer: EVP, Legal & External AffairsGrant1,425
Feb 23, 2026Buesinger Robert F.officer: EVP, PEM Segment HeadGrant1,301
Feb 23, 2026Chao Jamesdirector, officer: Senior ChairmanGrant7,472
Feb 23, 2026Chao John Tsung-chendirectorGrant2,434
Feb 23, 2026Chao Jamesdirector, officer: Senior ChairmanGrant3,884
Feb 23, 2026Chao Albertdirector, officer: Executive ChairmanGrant6,193
Feb 23, 2026Ederington L. Benjaminofficer: EVP, Legal & External AffairsGrant7,002
Feb 23, 2026Chao Albertdirector, officer: Executive ChairmanTax2,501$94.10
Feb 23, 2026Chao Jamesdirector, officer: Senior ChairmanTax1,569$94.10
Feb 23, 2026Bender Mark Stevenofficer: EVP & CFOGrant1,777
Feb 23, 2026Chao John Tsung-chendirectorGrant1,104
Feb 23, 2026Szwejbka Scott Thomasofficer: SVP, HIP Segment HeadTax91$94.10
Feb 23, 2026Chao John Tsung-chendirectorTax91$94.10
Feb 23, 2026Ederington L. Benjaminofficer: EVP, Legal & External AffairsTax357$94.10
Feb 23, 2026Szwejbka Scott Thomasofficer: SVP, HIP Segment HeadGrant3,983
Feb 23, 2026Buesinger Robert F.officer: EVP, PEM Segment HeadTax326$94.10

Source: WLK SEC Form 4 filings, latest May 14, 2026. For informational purposes only — not investment advice.

Institutional activity (13F)

How institutions changed their WLK positions over the last 6 months (SEC Form 13F).

Increased
238
New positions
137
Reduced
205
Sold out
108
Largest moves
InstitutionActionSharesFiled
ORBIS ALLAN GRAY LTDIncreased5.3MMay 15, 2026
ORBIS ALLAN GRAY LTDIncreased4.4MFeb 17, 2026
WELLINGTON MANAGEMENT GROUP LLPIncreased4.2MFeb 17, 2026
CAPITAL WORLD INVESTORSIncreased4.2MMay 13, 2026
VANGUARD GROUP INCIncreased3.9MJan 29, 2026
BLACKROCK, INC.Increased3.3MFeb 12, 2026
BLACKROCK, INC.Reduced3.1MMay 13, 2026
PRICE T ROWE ASSOCIATES INC /MD/Increased2.4MMay 15, 2026
PRICE T ROWE ASSOCIATES INC /MD/Increased2.2MFeb 17, 2026
CAPITAL WORLD INVESTORSNew Position2.2MFeb 11, 2026
DIMENSIONAL FUND ADVISORS LPIncreased1.9MFeb 12, 2026
BRANDES INVESTMENT PARTNERS, LPIncreased1.8MMay 15, 2026
WELLINGTON MANAGEMENT GROUP LLPReduced1.8MMay 15, 2026
VANGUARD PORTFOLIO MANAGEMENT LLCNew Position1.8MMay 8, 2026
BRANDES INVESTMENT PARTNERS, LPIncreased1.7MFeb 11, 2026

Source: SEC Form 13F filings. For informational purposes only — not investment advice.