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 |
|---|---|---|---|---|---|
| Orbis Allan Gray Ltd | 5,293,519 | $618.4M | 2.61% | +906,884+20.7% | Added |
| Capital World Investors | 4,211,006 | $491.9M | 0.07% | +2,039,682+93.9% | Added |
| BlackRock, Inc. | 3,079,087 | $359.7M | 0.01% | −182,346−5.6% | Reduced |
| Price T Rowe Associates Inc | 2,407,457 | $281.2M | 0.03% | +198,742+9.0% | Added |
| Brandes Investment Partners, LP | 1,842,650 | $215.3M | 1.52% | +172,323+10.3% | Added |
| Wellington Management Group LLP | 1,793,517 | $209.5M | 0.04% | −2,427,200−57.5% | Reduced |
| Vanguard Portfolio Management LLC | 1,769,808 | $206.7M | 0.01% | +1,769,808 | New |
| Dimensional Fund Advisors LP | 1,466,020 | $171.3M | 0.04% | −419,658−22.3% | Reduced |
| Vanguard Capital Management LLC | 1,455,594 | $170.0M | 0.00% | +1,455,594 | New |
| Goldman Sachs Group Inc | 1,393,327 | $162.8M | 0.02% | +639,374+84.8% | Added |
| State Street Corp | 1,380,493 | $161.3M | 0.01% | −16,140−1.2% | Reduced |
| FMR LLC | 1,312,473 | $153.3M | 0.01% | +1,083,630+473.5% | Added |
| UBS Asset Management Americas Inc | 981,405 | $114.6M | 0.02% | +56,701+6.1% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 943,975 | $110.3M | 0.15% | +67,090+7.7% | Added |
| UBS Group AG | 811,266 | $94.8M | 0.02% | +163,254+25.2% | Added |
| Holocene Advisors, LP | 730,035 | $85.3M | 0.21% | −490,587−40.2% | Reduced |
| Citadel Advisors LLC | 715,586 | $83.6M | 0.06% | +512,283+252.0% | Added |
| Geode Capital Management, LLC | 614,334 | $71.8M | 0.00% | +19,412+3.3% | Added |
| Nuveen, LLC | 564,744 | $66.0M | 0.02% | −88,165−13.5% | Reduced |
| Morgan Stanley | 486,508 | $56.8M | 0.00% | −273,115−36.0% | Reduced |
| Erste Asset Management GmbH | 395,000 | $45.8M | 0.42% | −25,000−6.0% | Reduced |
| Schroder Investment Management Group | 374,508 | $43.4M | 0.04% | +374,508 | New |
| Balyasny Asset Management LLC | 369,672 | $43.2M | 0.08% | +369,672 | New |
| Jacobs Levy Equity Management, Inc | 349,035 | $40.8M | 0.17% | −319,370−47.8% | Reduced |
| Woodline Partners LP | 337,075 | $39.4M | 0.15% | −291,084−46.3% | Reduced |
| Charles Schwab Investment Management Inc | 311,762 | $36.4M | 0.01% | +14,514+4.9% | Added |
| New York State Common Retirement Fund | 309,626 | $36.2M | 0.05% | 00.0% | Unchanged |
| ProShare Advisors LLC | 295,811 | $34.6M | 0.05% | −139,450−32.0% | Reduced |
| Allspring Global Investments Holdings, LLC | 285,434 | $33.3M | 0.06% | −221,322−43.7% | Reduced |
| Janus Henderson Group PLC | 269,783 | $31.5M | 0.02% | −64,810−19.4% | Reduced |
| Northern Trust Corp | 269,149 | $31.4M | 0.00% | +515+0.2% | Added |
| Federated Hermes, Inc. | 266,651 | $31.2M | 0.05% | +158,921+147.5% | Added |
| AQR Capital Management LLC | 260,070 | $30.4M | 0.01% | +239,535+1,166.5% | Added |
| Kempen Capital Management N.V. | 244,308 | $28.5M | 0.25% | +8,389+3.6% | Added |
| Bank of America Corp | 236,986 | $27.7M | 0.00% | +52,551+28.5% | Added |
| D. E. Shaw & Co., Inc. | 233,183 | $27.2M | 0.02% | −253,098−52.0% | Reduced |
| Merewether Investment Management, LP | 219,900 | $25.7M | 0.50% | −168,200−43.3% | Reduced |
| Vanguard Fiduciary Trust Co | 205,684 | $24.0M | 0.01% | +205,684 | New |
| Deprince Race & Zollo Inc | 203,366 | $23.8M | 0.45% | −860−0.4% | Reduced |
| Bank of New York Mellon Corp | 181,070 | $21.2M | 0.00% | +6,752+3.9% | Added |
| Invesco Ltd. | 179,402 | $21.0M | 0.00% | −33,755−15.8% | Reduced |
| Teachers Retirement System of the State of Kentucky | 178,160 | $20.8M | 0.16% | +12,845+7.8% | Added |
| Ceredex Value Advisors LLC | 177,900 | $20.8M | 0.65% | −57,718−24.5% | Reduced |
| Man Group plc | 160,286 | $18.7M | 0.04% | +160,286 | New |
| Robotti Robert | 145,004 | $16.9M | 2.64% | −111,240−43.4% | Reduced |
| Capstone Investment Advisors, LLC | 135,808 | $15.9M | 0.13% | +132,689+4,254.2% | Added |
| Sprott Inc. | 132,610 | $15.5M | 0.47% | −7,390−5.3% | Reduced |
| Quantinno Capital Management LP | 121,444 | $14.2M | 0.02% | +5,078+4.4% | Added |
| Recurrent Investment Advisors LLC | 112,790 | $13.2M | 0.79% | +37,157+49.1% | Added |
| Yaupon Capital Management LP | 107,044 | $12.5M | 0.62% | +107,044 | New |
| Wells Fargo & Company | 106,705 | $12.5M | 0.00% | +14,826+16.1% | Added |
| Jane Street Group, LLC | 105,686 | $12.3M | 0.01% | +105,686 | New |
| Royal Bank of Canada | 103,951 | $12.1M | 0.00% | +18,681+21.9% | Added |
| First Trust Advisors LP | 102,299 | $12.0M | 0.01% | −44,112−30.1% | Reduced |
| JPMorgan Chase & Co | 97,739 | $11.3M | 0.00% | +30,419+45.2% | Added |
| Russell Investments Group, Ltd. | 89,362 | $10.4M | 0.01% | −68,959−43.6% | Reduced |
| Rhumbline Advisers | 87,304 | $10.2M | 0.01% | +1,872+2.2% | Added |
| Millennium Management LLC | 84,997 | $9.93M | 0.01% | −342,757−80.1% | Reduced |
| Meiji Yasuda Asset Management Co Ltd. | 79,478 | $9.28M | 0.46% | +79,478 | New |
| Swiss National Bank | 75,900 | $8.87M | 0.01% | 00.0% | Unchanged |
| PDT Partners, LLC | 75,777 | $8.85M | 0.52% | +10,800+16.6% | Added |
| Principal Financial Group Inc | 74,481 | $8.70M | 0.00% | +2,762+3.9% | Added |
| Thomist Capital Management, LP | 73,000 | $8.53M | 2.92% | −38,900−34.8% | Reduced |
| Cerity Partners LLC | 72,679 | $8.49M | 0.01% | −54,416−42.8% | Reduced |
| Agman Capital LLC | 72,283 | $8.44M | 6.72% | 00.0% | Unchanged |
| Mackenzie Financial Corp | 71,968 | $8.41M | 0.01% | +52,135+262.9% | Added |
| Capital International Sarl | 63,634 | $7.43M | 0.12% | +63,634 | New |
| Lloyd Harbor Capital Management, LLC | 62,000 | $7.24M | 3.75% | +62,000 | New |
| Rokos Capital Management LLP | 60,800 | $7.10M | 0.13% | +60,800 | New |
| Walleye Capital LLC | 59,814 | $6.99M | 0.04% | +12,157+25.5% | Added |
| Citigroup Inc | 54,559 | $6.37M | 0.00% | +27,222+99.6% | Added |
| Legal & General Group Plc | 50,737 | $5.93M | 0.00% | −6,514−11.4% | Reduced |
| Albar Capital Partners LLP | 48,814 | $5.70M | 0.92% | +48,814 | New |
| Toroso Investments, LLC | 47,820 | $5.55M | 0.02% | +47,820 | New |
| Victory Capital Management Inc | 45,578 | $5.32M | 0.00% | −1,068,241−95.9% | Reduced |
| BCJ Capital Management, LLC | 45,296 | $5.29M | 0.28% | +45,296 | New |
| California State Teachers Retirement System | 44,459 | $5.19M | 0.01% | +8,361+23.2% | Added |
| Occudo Quantitative Strategies LP | 44,430 | $5.12M | 0.28% | +19,250+76.4% | Added |
| Alliancebernstein L.P. | 67,315 | $4.98M | 0.00% | −1,133−1.7% | Reduced |
| Engineers Gate Manager LP | 42,499 | $4.96M | 0.06% | −246,756−85.3% | Reduced |
| BI Asset Management Fondsmaeglerselskab A/S | 42,043 | $4.91M | 0.05% | +35,006+497.5% | Added |
| Retirement Systems of Alabama | 40,886 | $4.78M | 0.02% | +859+2.1% | Added |
| Bank of Montreal | 39,038 | $4.56M | 0.00% | +12,115+45.0% | Added |
| Squarepoint Ops LLC | 38,532 | $4.50M | 0.01% | +38,532 | New |
| Capital International Ltd | 37,300 | $4.36M | 0.16% | +37,300 | New |
| Twin Tree Management, LP | 35,977 | $4.20M | 0.88% | +35,977 | New |
| CI Private Wealth, LLC | 34,971 | $4.06M | 0.01% | −15,744−31.0% | Reduced |
| Gotham Asset Management, LLC | 34,564 | $4.04M | 0.01% | +25,365+275.7% | Added |
| Vanguard Asset Management, Ltd | 33,358 | $3.90M | 0.00% | +33,358 | New |
| Manufacturers Life Insurance Company, The | 33,295 | $3.89M | 0.00% | −156−0.5% | Reduced |
| Boston Partners | 31,696 | $3.70M | 0.00% | +31,696 | New |
| Occam Crest Management LP | 29,256 | $3.42M | 2.16% | +29,256 | New |
| Ameriprise Financial Inc | 28,487 | $3.33M | 0.00% | −20,630−42.0% | Reduced |
| Envestnet Asset Management Inc | 28,046 | $3.28M | 0.00% | +176+0.6% | Added |
| State of Wisconsin Investment Board | 25,252 | $2.95M | 0.01% | −459−1.8% | Reduced |
| California Public Employees Retirement System | 25,000 | $2.92M | 0.00% | −21,760−46.5% | Reduced |
| Stifel Financial Corp | 24,925 | $2.91M | 0.00% | +6,004+31.7% | Added |
| SG Americas Securities, LLC | 24,576 | $2.87M | 0.00% | −12,435−33.6% | Reduced |
| State Board of Administration of Florida Retirement System | 24,115 | $2.82M | 0.01% | 00.0% | Unchanged |
| Quantbot Technologies LP | 23,936 | $2.80M | 0.11% | −15,671−39.6% | Reduced |