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.
13F holders, Q1 2026
Institutional positions in Westlake Corp as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 339
- +47 vs. Q4 2025
- Shares held
- 44.1M
- +1.84M (+4.3%) vs. Q4 2025
- Total value
- $5.15B
- +$2.02B (+64.7%) vs. Q4 2025
- New holders
- 93
- 117 more added
- Sold out
- 46
- 87 more reduced
6 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting WLK on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 360 | $2.90B |
| Q1 2026 | 339 | $5.15B |
| Q4 2025 | 298 | $3.43B |
| Q3 2025 | 305 | $3.20B |
| Q2 2025 | 306 | $2.99B |
| Q1 2025 | 361 | $3.64B |
| Q4 2024 | 378 | $4.04B |
| Q3 2024 | 403 | $5.08B |
| Q2 2024 | 382 | $4.93B |
| Q1 2024 | 347 | $5.29B |
| Q4 2023 | 357 | $5.04B |
| Q3 2023 | 335 | $4.64B |
| Q2 2023 | 340 | $4.42B |
| Q1 2023 | 342 | $4.40B |
| Q4 2022 | 344 | $3.73B |
| Q3 2022 | 321 | $3.03B |
| Q2 2022 | 355 | $3.50B |
| Q1 2022 | 328 | $4.38B |
| Q4 2021 | 298 | $3.37B |
| Q3 2021 | 272 | $3.15B |
| Q2 2021 | 276 | $3.02B |
| Q1 2021 | 240 | $3.09B |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Westlake Corp; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Deprince Race & Zollo Inc | 203,366 | $23.8M | 0.45% | −860−0.4% | Reduced |
| Vanguard Fiduciary Trust Co | 205,684 | $24.0M | 0.01% | +205,684 | New |
| Merewether Investment Management, LP | 219,900 | $25.7M | 0.50% | −168,200−43.3% | Reduced |
| D. E. Shaw & Co., Inc. | 233,183 | $27.2M | 0.02% | −253,098−52.0% | Reduced |
| Bank of America Corp | 236,986 | $27.7M | 0.00% | +52,551+28.5% | Added |
| Kempen Capital Management N.V. | 244,308 | $28.5M | 0.25% | +8,389+3.6% | Added |
| AQR Capital Management LLC | 260,070 | $30.4M | 0.01% | +239,535+1,166.5% | Added |
| Federated Hermes, Inc. | 266,651 | $31.2M | 0.05% | +158,921+147.5% | Added |
| Northern Trust Corp | 269,149 | $31.4M | 0.00% | +515+0.2% | Added |
| Janus Henderson Group PLC | 269,783 | $31.5M | 0.02% | −64,810−19.4% | Reduced |
| Allspring Global Investments Holdings, LLC | 285,434 | $33.3M | 0.06% | −221,322−43.7% | Reduced |
| ProShare Advisors LLC | 295,811 | $34.6M | 0.05% | −139,450−32.0% | Reduced |
| New York State Common Retirement Fund | 309,626 | $36.2M | 0.05% | 00.0% | Unchanged |
| Charles Schwab Investment Management Inc | 311,762 | $36.4M | 0.01% | +14,514+4.9% | Added |
| Woodline Partners LP | 337,075 | $39.4M | 0.15% | −291,084−46.3% | Reduced |
| Jacobs Levy Equity Management, Inc | 349,035 | $40.8M | 0.17% | −319,370−47.8% | Reduced |
| Balyasny Asset Management LLC | 369,672 | $43.2M | 0.08% | +369,672 | New |
| Schroder Investment Management Group | 374,508 | $43.4M | 0.04% | +374,508 | New |
| Erste Asset Management GmbH | 395,000 | $45.8M | 0.42% | −25,000−6.0% | Reduced |
| Morgan Stanley | 486,508 | $56.8M | 0.00% | −273,115−36.0% | Reduced |
| Nuveen, LLC | 564,744 | $66.0M | 0.02% | −88,165−13.5% | Reduced |
| Geode Capital Management, LLC | 614,334 | $71.8M | 0.00% | +19,412+3.3% | Added |
| Citadel Advisors LLC | 715,586 | $83.6M | 0.06% | +512,283+252.0% | Added |
| Holocene Advisors, LP | 730,035 | $85.3M | 0.21% | −490,587−40.2% | Reduced |
| UBS Group AG | 811,266 | $94.8M | 0.02% | +163,254+25.2% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 943,975 | $110.3M | 0.15% | +67,090+7.7% | Added |
| UBS Asset Management Americas Inc | 981,405 | $114.6M | 0.02% | +56,701+6.1% | Added |
| FMR LLC | 1,312,473 | $153.3M | 0.01% | +1,083,630+473.5% | Added |
| State Street Corp | 1,380,493 | $161.3M | 0.01% | −16,140−1.2% | Reduced |
| Goldman Sachs Group Inc | 1,393,327 | $162.8M | 0.02% | +639,374+84.8% | Added |
| Vanguard Capital Management LLC | 1,455,594 | $170.0M | 0.00% | +1,455,594 | New |
| Dimensional Fund Advisors LP | 1,466,020 | $171.3M | 0.04% | −419,658−22.3% | Reduced |
| Vanguard Portfolio Management LLC | 1,769,808 | $206.7M | 0.01% | +1,769,808 | New |
| Wellington Management Group LLP | 1,793,517 | $209.5M | 0.04% | −2,427,200−57.5% | Reduced |
| Brandes Investment Partners, LP | 1,842,650 | $215.3M | 1.52% | +172,323+10.3% | Added |
| Price T Rowe Associates Inc | 2,407,457 | $281.2M | 0.03% | +198,742+9.0% | Added |
| BlackRock, Inc. | 3,079,087 | $359.7M | 0.01% | −182,346−5.6% | Reduced |
| Capital World Investors | 4,211,006 | $491.9M | 0.07% | +2,039,682+93.9% | Added |
| Orbis Allan Gray Ltd | 5,293,519 | $618.4M | 2.61% | +906,884+20.7% | Added |
| Antipodes Partners Ltd | 0 | $0 | 0.00% | −416,520−100.0% | Sold out |
| Voloridge Investment Management, LLC | 0 | $0 | 0.00% | −348,953−100.0% | Sold out |
| Two Sigma Investments, LP | 0 | $0 | 0.00% | −198,379−100.0% | Sold out |
| Diamond Hill Capital Management Inc | 0 | $0 | 0.00% | −190,180−100.0% | Sold out |
| ExodusPoint Capital Management, LP | 0 | $0 | 0.00% | −154,391−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −144,700−100.0% | Sold out |
| Alyeska Investment Group, L.P. | 0 | $0 | 0.00% | −103,041−100.0% | Sold out |
| Natixis | 0 | $0 | 0.00% | −87,872−100.0% | Sold out |
| Select Equity Group, L.P. | 0 | $0 | 0.00% | −74,997−100.0% | Sold out |
| Lazard Asset Management LLC | 0 | $0 | 0.00% | −74,428−100.0% | Sold out |
| Jain Global LLC | 0 | $0 | 0.00% | −62,043−100.0% | Sold out |
| HITE Hedge Asset Management LLC | 0 | $0 | 0.00% | −52,153−100.0% | Sold out |
| Wedge Capital Management L L P | 0 | $0 | 0.00% | −42,841−100.0% | Sold out |
| VARCOV Co. | 0 | $0 | 0.00% | −35,597−100.0% | Sold out |
| Luminus Management LLC | 0 | $0 | 0.00% | −35,189−100.0% | Sold out |
| Hudson Bay Capital Management LP | 0 | $0 | 0.00% | −30,443−100.0% | Sold out |
| Aventail Capital Group, LP | 0 | $0 | 0.00% | −27,764−100.0% | Sold out |
| Entropy Technologies, LP | 0 | $0 | 0.00% | −20,137−100.0% | Sold out |
| Alberta Investment Management Corp | 0 | $0 | 0.00% | −19,700−100.0% | Sold out |
| Jump Financial, LLC | 0 | $0 | 0.00% | −17,600−100.0% | Sold out |
| Sciencast Management LP | 0 | $0 | 0.00% | −15,619−100.0% | Sold out |
| Weiss Asset Management LP | 0 | $0 | 0.00% | −9,928−100.0% | Sold out |
| Brevan Howard Capital Management LP | 0 | $0 | 0.00% | −9,468−100.0% | Sold out |
| Alpine Woods Capital Investors, LLC | 0 | $0 | 0.00% | −8,989−100.0% | Sold out |
| DekaBank Deutsche Girozentrale | 0 | $0 | 0.00% | −3,540−100.0% | Sold out |
| State of Wyoming | 0 | $0 | 0.00% | −7,824−100.0% | Sold out |
| Oak Thistle LLC | 0 | $0 | 0.00% | −7,170−100.0% | Sold out |
| Numerai GP LLC | 0 | $0 | 0.00% | −5,792−100.0% | Sold out |
| Quest Partners LLC | 0 | $0 | 0.00% | −5,192−100.0% | Sold out |
| Caxton Associates LLP | 0 | $0 | 0.00% | −4,615−100.0% | Sold out |
| Ci Investments Inc. | 0 | $0 | 0.00% | −4,128−100.0% | Sold out |
| Daiwa Securities Group Inc. | 0 | $0 | 0.00% | −4,108−100.0% | Sold out |
| Assenagon Asset Management S.A. | 0 | $0 | 0.00% | −3,790−100.0% | Sold out |
| Dark Forest Capital Management LP | 0 | $0 | 0.00% | −3,750−100.0% | Sold out |
| Lloyd Advisory Services, LLC. | 0 | $0 | 0.00% | −2,445−100.0% | Sold out |
| Simplex Trading, LLC | 0 | $0 | 0.00% | −1,981−100.0% | Sold out |
| Manning & Napier Advisors LLC | 0 | $0 | 0.00% | −1,745−100.0% | Sold out |
| Wexford Capital LP | 0 | $0 | 0.00% | −1,344−100.0% | Sold out |
| Kestra Advisory Services, LLC | 0 | $0 | 0.00% | −1,138−100.0% | Sold out |
| Quarry LP | 0 | $0 | 0.00% | −426−100.0% | Sold out |
| DV Trading LLC | 0 | $0 | 0.00% | −300−100.0% | Sold out |
| Ronald Blue Trust, Inc. | 0 | $0 | 0.00% | −186−100.0% | Sold out |
| Pinnacle Bancorp, Inc. | 0 | $0 | 0.00% | −58−100.0% | Sold out |
| SageView Advisory Group, LLC | 0 | $0 | 0.00% | −40−100.0% | Sold out |
| Global Wealth Strategies & Associates | 0 | $0 | 0.00% | −23−100.0% | Sold out |
| Optima Capital LLC | 0 | $0 | 0.00% | −3−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |
| Norges Bank | – | – | – | – | Not filed |
| Comerica Bank | – | – | – | – | Not filed |
| CIBC Private Wealth Group, LLC | – | – | – | – | Not filed |
| Trust Co of Vermont | – | – | – | – | Not filed |
| Global Retirement Partners, LLC | – | – | – | – | Not filed |