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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 $2.90B in total; no superinvestor holds it.

Q4 2025 vs. Q3 2025

How the institutions holding Westlake Corp changed between Q3 2025 and Q4 2025.

All holders in Q4 2025All holders in Q3 2025

13F holders of WLK: Q3 2025 compared with Q4 2025
MeasureQ3 2025Of which not filed for Q4 2025Q4 2025Change
Holders3056298−1
Shares41.6M66.1K46.4M+4.91M (+11.8%)
Value$3.20B$5.09M$3.43B+$234.7M (+7.3%)

6 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (63)

Institutions that held Westlake Corp at the end of Q4 2025 but not at the end of Q3 2025.

Institutions new to WLK in Q4 2025
InstitutionSharesValue% of portfolio
Capital World Investors2,171,324$160.5M0.02%
Engineers Gate Manager LP289,255$21.4M0.25%
Ceredex Value Advisors LLC235,618$17.4M0.52%
Diamond Hill Capital Management Inc190,180$14.1M0.07%
Norges Bank181,328$13.4M0.00%
ExodusPoint Capital Management, LP154,391$11.4M0.13%
Natixis87,872$6.50M0.03%
Swiss National Bank75,900$5.61M0.00%
Select Equity Group, L.P.74,997$5.55M0.03%
Agman Capital LLC72,283$5.34M4.55%
VARCOV Co.35,597$2.63M1.04%
Luminus Management LLC35,189$2.60M2.40%
State of Wisconsin Investment Board25,711$1.90M0.00%
AMG National Trust Bank23,330$1.73M0.04%
Alberta Investment Management Corp19,700$1.46M0.01%
Sciencast Management LP15,619$1.15M0.16%
Zurcher Kantonalbank (Zurich Cantonalbank)13,367$988.4K0.00%
Marnell Management LLC11,700$865.1K0.66%
Arizona State Retirement System10,794$798.1K0.00%
Weiss Asset Management LP9,928$734.1K0.01%
Alpine Woods Capital Investors, LLC8,989$664.6K0.16%
KLP Kapitalforvaltning AS8,200$606.3K0.00%
State of Wyoming7,824$578.5K0.06%
Oak Thistle LLC7,170$530.1K0.07%
Edgestream Partners, L.P.7,095$524.6K0.01%
Pictet Asset Management Holding SA6,025$445.5K0.00%
Numerai GP LLC5,792$428.3K0.05%
Storgate, LLC5,380$397.8K0.33%
Caxton Associates LLP4,615$341.2K0.01%
Guggenheim Capital LLC4,174$308.6K0.00%
Assenagon Asset Management S.A.3,790$280.2K0.00%
AlphaGrep UK Ltd3,471$256.6K0.09%
Capstone Investment Advisors, LLC3,119$230.6K0.00%
Total Wealth Planning & Management, Inc.2,955$218.5K0.17%
Odyssean, LLC2,903$214.6K0.15%
ISAM Funds (UK) Ltd2,828$209.1K0.08%
Lloyd Advisory Services, LLC.2,445$180.8K0.07%
Virtus Investment Advisers, Inc.2,186$161.6K0.04%
Simplex Trading, LLC1,981$146.5K0.00%
Wexford Capital LP1,344$99.4K0.03%
Kestra Advisory Services, LLC1,138$84.2K0.00%
Deutsche Bank AG1,084$80.2K0.00%
Aster Capital Management (DIFC) Ltd820$60.6K0.03%
Quarry LP426$31.5K0.01%
BNP PARIBAS ASSET MANAGEMENT Holding S.A.338$25.0K0.00%
DV Trading LLC300$22.2K0.00%
Los Angeles Capital Management LLC157$10.7K0.00%
Ancora Advisors, LLC97$7.17K0.00%
Pinnacle Wealth Planning Services, Inc.58$4.29K0.00%
First Eagle Investment Management, LLC53$3.92K0.00%
SageView Advisory Group, LLC40$2.96K0.00%
Basecamp Wealth Advisors LLC40$2.96K0.00%
Torren Management, LLC34$2.50K0.00%
Global Wealth Strategies & Associates23$1.70K0.00%
Brown Brothers Harriman & Co21$1.55K0.00%
AdvisorNet Financial, Inc19$1.41K0.00%
JFS Wealth Advisors, LLC14$1.04K0.00%
American Capital Advisory, LLC7$5180.00%
Rialto Wealth Management, LLC7$5180.00%
Optima Capital LLC3$2220.00%
Hughes Financial Services, LLC1$740.00%
Keating Financial Advisory Services, Inc.1$740.00%
Dunhill Financial, LLC1$530.00%

Sold out (64)

Institutions that held Westlake Corp at the end of Q3 2025 and filed for Q4 2025 without it.

Institutions that sold out of WLK in Q4 2025
InstitutionShares, Q3 2025Value, Q3 2025
Balyasny Asset Management LLC475,743$36.7M
Caisse de Depot Et Placement du Quebec368,318$28.4M
Arrowstreet Capital, Limited Partnership299,728$23.1M
Schroder Investment Management Group261,562$20.1M
1832 Asset Management L.P.138,920$10.7M
Impala Asset Management LLC115,000$8.86M
Ilex Capital Partners (UK) LLP110,691$8.53M
Lloyd Harbor Capital Management, LLC110,000$8.48M
Janney Montgomery Scott LLC100,998$7.78M
Squarepoint Ops LLC100,391$7.74M
Zimmer Partners, LP90,000$6.94M
Point72 Asset Management, L.P.84,884$6.54M
Nomura Holdings Inc69,220$5.33M
Concentric Capital Strategies, LP64,158$4.94M
Tudor Investment Corp Et Al62,600$4.82M
Marshall Wace, LLP56,461$4.35M
HRT Financial LP47,624$3.67M
Journey Advisory Group, LLC45,072$3.47M
Aquatic Capital Management LLC29,130$2.24M
Amundi26,773$2.19M
Renaissance Technologies LLC25,900$2.00M
Knights of Columbus Asset Advisors LLC22,364$1.72M
APG Asset Management N.V.21,100$1.38M
Twin Tree Management, LP16,037$1.24M
Jane Street Group, LLC12,982$1.00M
Farringdon Capital, Ltd.12,529$965.5K
Exchange Traded Concepts, LLC12,241$943.3K
Lighthouse Investment Partners, LLC11,661$898.6K
Scientech Research LLC9,742$750.7K
Board of the Pension Protection Fund9,500$732.1K
Summit Wealth Group LLC9,993$713.2K
Bayesian Capital Management, LP9,241$712.1K
Diametric Capital, LP6,415$494.3K
Sequent Planning LLC4,845$373.4K
Kovitz Investment Group Partners, LLC4,105$316.3K
Greenland Capital Management LP4,008$304.3K
LMR Partners LLP3,861$297.5K
Prudential Financial Inc3,678$283.4K
Walleye Trading LLC3,673$283.0K
Magnetar Financial LLC3,329$256.5K
Wiley Bros.-Aintree Capital, LLC3,028$233.3K
McMahon Financial Advisors, LLC2,916$224.7K
Voya Investment Management LLC2,772$213.6K
Avanza Fonder AB2,680$206.5K
ASR Vermogensbeheer N.V.2,449$188.7K
Grey Fox Wealth Advisors, LLC1,154$88.9K
Itau Unibanco Holding S.A.497$38.3K
Caitong International Asset Management Co., Ltd366$28.2K
Arcadia Investment Management Corp350$27.0K
Pathway Financial Advisers, LLC289$22.3K
FNY Investment Advisers, LLC273$21.0K
CVA Family Office, LLC120$9.25K
Bessemer Group Inc97$8.00K
Rise Advisors, LLC83$6.42K
Optiver Holding B.V.83$6.40K
Ameritas Advisory Services, LLC78$6.01K
Principal Securities, Inc.40$3.08K
Wealthspire Advisors, LLC37$2.85K
Bell Investment Advisors, Inc18$1.39K
Advisory Services Network, LLC15$1.16K
Jackson, Grant Investment Advisers, Inc.11$848
Core Alternative Capital4$308
New Millennium Group LLC2$154
Cloud Capital Management, LLC2$0

Not filed for Q4 2025 yet (6)

Institutions that held Westlake Corp at the end of Q3 2025 and haven't filed a 13F for Q4 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding WLK in Q3 2025 that haven't filed for Q4 2025
InstitutionShares, Q3 2025Value, Q3 2025
Cubist Systematic Strategies, LLC31,396$2.42M
Point72 Hong Kong Ltd24,871$1.92M
Point72 Asia (Singapore) Pte. Ltd.5,474$421.8K
Point72 (DIFC) Ltd3,935$303.2K
Point72 Europe (London) LLP373$28.7K
Hemington Wealth Management29$2.00K