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Westlake Corp

WLK
Exchange
NYSE
Industry
Industrial Organic Chemicals
SEC CIK
0001262823

In the last 90 days, Westlake Corp insiders filed 0 open-market purchases and 1 sale; 360 institutions reported holding it in 13F filings for Q2 2026, worth $2.91B in total; no superinvestor holds it.

Key figures

Insider buysOpen market, last 90 days
0
Insider sellsLast 90 days, $3.12M in total
1
13F holdersQ2 2026, +24 vs. previous quarter
360
13F valueReported value at the end of Q2 2026
$2.91B
Superinvestors holdingAt the end of Q2 2026
0

Price chart

Superinvestors holding WLK, Q2 2026

Go to the superinvestors tab

No superinvestor reported holding WLK at the end of Q2 2026.

Latest insider trades

Open-market purchases and sales by Westlake Corp insiders from Form 4, newest first.

See all insider trades
Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Aug 11, 2026 (view filing)5:45 PM ETAug 11Same dayChao AlbertExecutive ChairmanSSale−38.9K$80.28−$3.12M−5.7%642.9K after2 lots
Mar 31, 2026 (view filing)Mar 274 daysBuesinger Robert F.EVP, PEM Segment HeadSSale−4.00K$115.25−$461.0K−10.4%34.5K after
Mar 30, 2026 (view filing)Mar 273 daysBender Mark StevenEVP & CFOSSale−16.4K$112.54−$1.85M−36.9%28.0K after
Mar 2, 2026 (view filing)Feb 273 daysBender Mark StevenEVP & CFOSSale−17.4K$100.92−$1.76M−28.2%44.4K after2 lots
Dec 23, 2025 (view filing)Dec 221 dayChao AlbertExecutive ChairmanSSale−40.8K$73.58−$3.00M−6.1%627.7K after3 lots
Jun 9, 2025 (view filing)Apr 2248 daysLateBuesinger Robert F.EVP, PEM Segment HeadPPurchase+83$93.39+$7.75KNew position83 after
Jun 9, 2025 (view filing)May 2713 daysLateBuesinger Robert F.EVP, PEM Segment HeadSSale−83$72.70−$6.03K−100.0%0 after
Dec 2, 2024 (view filing)Nov 293 daysChao David Tsung-HungDirectorSSale−1.75K$129.08−$225.9K−18.4%7.78K after
Nov 25, 2024 (view filing)Nov 223 daysChao David Tsung-HungDirectorSSale−1.75K$130.00−$227.5K−15.5%9.53K after
May 13, 2024 (view filing)May 94 daysBuesinger Robert F.EVP, HIP, IT & DigitalSSale−3.50K$158.50−$554.8K−16.6%17.6K after

Top 10 13F holders, Q2 2026

The largest institutional positions in Westlake Corp at the end of Q2 2026; share changes are against Q1 2026.

See all 360 holders
Institutions holding WLK in Q2 2026
InstitutionSharesValue% of portfolioChange in sharesAction
BlackRock, Inc.3,294,162$240.5M0.00%+215,075+7.0%Added
Capital World Investors2,842,348$207.5M0.02%−1,368,658−32.5%Reduced
Price T Rowe Associates Inc2,206,676$161.1M0.02%−200,781−8.3%Reduced
Orbis Allan Gray Ltd2,084,364$152.2M0.52%−3,209,155−60.6%Reduced
Dimensional Fund Advisors LP2,051,554$149.8M0.03%+585,534+39.9%Added
Vanguard Portfolio Management LLC1,752,627$127.9M0.01%−17,181−1.0%Reduced
Brandes Investment Partners, LP1,572,939$114.8M0.80%−269,711−14.6%Reduced
AQR Capital Management LLC1,570,453$114.6M0.04%+1,310,383+503.9%Added
Vanguard Capital Management LLC1,464,223$106.9M0.00%+8,629+0.6%Added
State Street Corp1,453,407$106.1M0.00%+72,914+5.3%Added