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, Q4 2025
Institutional positions in Westlake Corp as of Dec 31, 2025. 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
- 298
- −1 vs. Q3 2025
- Shares held
- 46.4M
- +4.91M (+11.8%) vs. Q3 2025
- Total value
- $3.43B
- +$234.7M (+7.3%) vs. Q3 2025
- New holders
- 63
- 93 more added
- Sold out
- 64
- 112 more reduced
6 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding Westlake Corp; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| State Board of Administration of Florida Retirement System | 24,115 | $1.78M | 0.00% | 00.0% | Unchanged |
| Occudo Quantitative Strategies LP | 25,180 | $1.86M | 0.12% | −2,232−8.1% | Reduced |
| State of Wisconsin Investment Board | 25,711 | $1.90M | 0.00% | +25,711 | New |
| Verition Fund Management LLC | 26,078 | $1.93M | 0.01% | −1,077−4.0% | Reduced |
| Bank of Montreal | 26,923 | $1.99M | 0.00% | −18,242−40.4% | Reduced |
| Citigroup Inc | 27,337 | $2.02M | 0.00% | −89,814−76.7% | Reduced |
| Aventail Capital Group, LP | 27,764 | $2.05M | 0.12% | −50,576−64.6% | Reduced |
| Envestnet Asset Management Inc | 27,870 | $2.06M | 0.00% | +424+1.5% | Added |
| SEI Investments Co | 28,442 | $2.10M | 0.00% | +13,675+92.6% | Added |
| Comerica Bank | 28,483 | $2.11M | 0.01% | +221+0.8% | Added |
| Hudson Bay Capital Management LP | 30,443 | $2.25M | 0.01% | +26,947+770.8% | Added |
| Manufacturers Life Insurance Company, The | 33,451 | $2.47M | 0.00% | +5,371+19.1% | Added |
| Luminus Management LLC | 35,189 | $2.60M | 2.40% | +35,189 | New |
| VARCOV Co. | 35,597 | $2.63M | 1.04% | +35,597 | New |
| California State Teachers Retirement System | 36,098 | $2.67M | 0.00% | +34,009+1,628.0% | Added |
| SG Americas Securities, LLC | 37,011 | $2.74M | 0.00% | +30,072+433.4% | Added |
| Quantbot Technologies LP | 39,607 | $2.93M | 0.10% | −17,178−30.3% | Reduced |
| Retirement Systems of Alabama | 40,027 | $2.96M | 0.01% | −288−0.7% | Reduced |
| Wedge Capital Management L L P | 42,841 | $3.17M | 0.06% | +3,466+8.8% | Added |
| California Public Employees Retirement System | 46,760 | $3.46M | 0.00% | −24−0.1% | Reduced |
| Walleye Capital LLC | 47,657 | $3.52M | 0.02% | −100,660−67.9% | Reduced |
| Ameriprise Financial Inc | 49,117 | $3.63M | 0.00% | −35,320−41.8% | Reduced |
| CI Private Wealth, LLC | 50,715 | $3.75M | 0.01% | +17,689+53.6% | Added |
| HITE Hedge Asset Management LLC | 52,153 | $3.86M | 0.25% | −47,847−47.8% | Reduced |
| Legal & General Group Plc | 57,251 | $4.23M | 0.00% | +20,619+56.3% | Added |
| Jain Global LLC | 62,043 | $4.59M | 0.04% | +49,626+399.7% | Added |
| PDT Partners, LLC | 64,977 | $4.80M | 0.31% | +45,457+232.9% | Added |
| Barclays PLC | 66,613 | $4.93M | 0.00% | −35,049−34.5% | Reduced |
| JPMorgan Chase & Co | 67,320 | $4.98M | 0.00% | −90,474−57.3% | Reduced |
| Alliancebernstein L.P. | 68,448 | $5.06M | 0.00% | +1,686+2.5% | Added |
| Principal Financial Group Inc | 71,719 | $5.30M | 0.00% | −2,394−3.2% | Reduced |
| Agman Capital LLC | 72,283 | $5.34M | 4.55% | +72,283 | New |
| Lazard Asset Management LLC | 74,428 | $5.50M | 0.01% | +1,806+2.5% | Added |
| Select Equity Group, L.P. | 74,997 | $5.55M | 0.03% | +74,997 | New |
| Recurrent Investment Advisors LLC | 75,633 | $5.59M | 0.41% | +57,527+317.7% | Added |
| Swiss National Bank | 75,900 | $5.61M | 0.00% | +75,900 | New |
| Royal Bank of Canada | 85,270 | $6.30M | 0.00% | −296,316−77.7% | Reduced |
| Rhumbline Advisers | 85,432 | $6.32M | 0.01% | −3,427−3.9% | Reduced |
| Natixis | 87,872 | $6.50M | 0.03% | +87,872 | New |
| Wells Fargo & Company | 91,879 | $6.79M | 0.00% | −5,250−5.4% | Reduced |
| BNP Paribas Arbitrage, SA | 92,223 | $6.82M | 0.00% | −98,743−51.7% | Reduced |
| Alyeska Investment Group, L.P. | 103,041 | $7.62M | 0.02% | −16,945−14.1% | Reduced |
| Federated Hermes, Inc. | 107,730 | $7.97M | 0.01% | +104,701+3,456.6% | Added |
| Thomist Capital Management, LP | 111,900 | $8.36M | 2.28% | +65,700+142.2% | Added |
| Quantinno Capital Management LP | 116,366 | $8.60M | 0.02% | +51,131+78.4% | Added |
| Cerity Partners LLC | 127,095 | $9.40M | 0.01% | +44,016+53.0% | Added |
| Sprott Inc. | 140,000 | $10.4M | 0.37% | +10,000+7.7% | Added |
| Two Sigma Advisers, LP | 144,700 | $10.7M | 0.02% | +71,000+96.3% | Added |
| First Trust Advisors LP | 146,411 | $10.8M | 0.01% | −18,525−11.2% | Reduced |
| ExodusPoint Capital Management, LP | 154,391 | $11.4M | 0.13% | +154,391 | New |
| Russell Investments Group, Ltd. | 158,321 | $11.7M | 0.01% | −26,310−14.3% | Reduced |
| Teachers Retirement System of the State of Kentucky | 165,315 | $12.2M | 0.09% | 00.0% | Unchanged |
| Bank of New York Mellon Corp | 174,318 | $12.9M | 0.00% | −3,664−2.1% | Reduced |
| Norges Bank | 181,328 | $13.4M | 0.00% | +181,328 | New |
| Bank of America Corp | 184,435 | $13.6M | 0.00% | −24,462−11.7% | Reduced |
| Diamond Hill Capital Management Inc | 190,180 | $14.1M | 0.07% | +190,180 | New |
| Two Sigma Investments, LP | 198,379 | $14.7M | 0.02% | +95,414+92.7% | Added |
| Citadel Advisors LLC | 203,303 | $15.0M | 0.01% | −997,548−83.1% | Reduced |
| Deprince Race & Zollo Inc | 204,226 | $15.1M | 0.29% | +15,217+8.1% | Added |
| Invesco Ltd. | 213,157 | $15.8M | 0.00% | +78,458+58.2% | Added |
| FMR LLC | 228,843 | $16.9M | 0.00% | −85,507−27.2% | Reduced |
| Ceredex Value Advisors LLC | 235,618 | $17.4M | 0.52% | +235,618 | New |
| Kempen Capital Management N.V. | 235,919 | $17.4M | 0.15% | +39,876+20.3% | Added |
| Robotti Robert | 256,244 | $18.9M | 3.40% | +74,393+40.9% | Added |
| Northern Trust Corp | 268,634 | $19.9M | 0.00% | +30,495+12.8% | Added |
| Engineers Gate Manager LP | 289,255 | $21.4M | 0.25% | +289,255 | New |
| Charles Schwab Investment Management Inc | 297,248 | $22.0M | 0.00% | +24,286+8.9% | Added |
| New York State Common Retirement Fund | 309,626 | $22.9M | 0.03% | 00.0% | Unchanged |
| Janus Henderson Group PLC | 334,593 | $24.7M | 0.01% | −31,391−8.6% | Reduced |
| Voloridge Investment Management, LLC | 348,953 | $25.8M | 0.09% | −45,354−11.5% | Reduced |
| Merewether Investment Management, LP | 388,100 | $28.7M | 0.66% | +119,700+44.6% | Added |
| Antipodes Partners Ltd | 416,520 | $30.8M | 0.65% | −139,384−25.1% | Reduced |
| Erste Asset Management GmbH | 420,000 | $31.1M | 0.26% | +160,000+61.5% | Added |
| Millennium Management LLC | 427,754 | $31.6M | 0.02% | +321,434+302.3% | Added |
| ProShare Advisors LLC | 435,261 | $32.2M | 0.06% | +12,621+3.0% | Added |
| D. E. Shaw & Co., Inc. | 486,281 | $36.0M | 0.03% | +326,272+203.9% | Added |
| Allspring Global Investments Holdings, LLC | 506,756 | $37.6M | 0.06% | −39,395−7.2% | Reduced |
| Thompson Siegel & Walmsley LLC | 536,290 | $39.7M | 0.67% | +94,950+21.5% | Added |
| Geode Capital Management, LLC | 594,922 | $44.0M | 0.00% | −58,164−8.9% | Reduced |
| Woodline Partners LP | 628,159 | $46.4M | 0.18% | +434,373+224.2% | Added |
| UBS Group AG | 648,012 | $47.9M | 0.01% | +87,532+15.6% | Added |
| Nuveen, LLC | 652,909 | $48.3M | 0.01% | −33,630−4.9% | Reduced |
| Jacobs Levy Equity Management, Inc | 668,405 | $49.4M | 0.19% | −192,318−22.3% | Reduced |
| Goldman Sachs Group Inc | 753,953 | $55.7M | 0.01% | −297,444−28.3% | Reduced |
| Morgan Stanley | 759,623 | $56.2M | 0.00% | −56,006−6.9% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 876,885 | $64.8M | 0.10% | +20,909+2.4% | Added |
| UBS Asset Management Americas Inc | 924,704 | $68.4M | 0.01% | +7,431+0.8% | Added |
| Victory Capital Management Inc | 1,113,819 | $82.4M | 0.05% | −1,752,541−61.1% | Reduced |
| Holocene Advisors, LP | 1,220,622 | $90.3M | 0.19% | +366,438+42.9% | Added |
| State Street Corp | 1,396,633 | $103.3M | 0.00% | +101,391+7.8% | Added |
| Brandes Investment Partners, LP | 1,670,327 | $123.5M | 0.94% | +121,633+7.9% | Added |
| Dimensional Fund Advisors LP | 1,885,678 | $139.4M | 0.03% | +585,438+45.0% | Added |
| Capital World Investors | 2,171,324 | $160.5M | 0.02% | +2,171,324 | New |
| Price T Rowe Associates Inc | 2,208,715 | $163.3M | 0.02% | +5720.0% | Added |
| BlackRock, Inc. | 3,261,433 | $241.2M | 0.00% | +75,697+2.4% | Added |
| Vanguard Group Inc | 3,917,329 | $289.6M | 0.00% | +477,698+13.9% | Added |
| Wellington Management Group LLP | 4,220,717 | $312.1M | 0.05% | +4,163,207+7,239.1% | Added |
| Orbis Allan Gray Ltd | 4,386,635 | $324.3M | 1.36% | +472,224+12.1% | Added |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −475,743−100.0% | Sold out |
| Caisse de Depot Et Placement du Quebec | 0 | $0 | 0.00% | −368,318−100.0% | Sold out |