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 |
|---|---|---|---|---|---|
| Vanguard Investments Australia, Ltd. | 9,932 | $1.16M | 0.00% | +9,932 | New |
| Walnut Level Capital LLC | 10,000 | $1.17M | 1.33% | −1,404−12.3% | Reduced |
| Schonfeld Strategic Advisors LLC | 10,182 | $1.19M | 0.01% | +4,170+69.4% | Added |
| Yousif Capital Management, LLC | 10,518 | $1.23M | 0.01% | −537−4.9% | Reduced |
| Arizona State Retirement System | 10,580 | $1.24M | 0.01% | −214−2.0% | Reduced |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 11,262 | $1.32M | 0.00% | +1,282+12.8% | Added |
| Creative Planning | 11,961 | $1.40M | 0.00% | +4,276+55.6% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 12,479 | $1.46M | 0.00% | +3,297+35.9% | Added |
| Polymer Capital Management (US) LLC | 12,520 | $1.46M | 0.22% | +6,020+92.6% | Added |
| Summit Trail Advisors, LLC | 12,524 | $1.46M | 0.02% | −3,037−19.5% | Reduced |
| SEI Investments Co | 12,769 | $1.49M | 0.00% | −15,673−55.1% | Reduced |
| Mutual of America Capital Management LLC | 12,780 | $1.49M | 0.02% | −1,100−7.9% | Reduced |
| XTX Topco Ltd | 12,878 | $1.50M | 0.03% | +12,878 | New |
| State of Tennessee, Treasury Department | 12,946 | $1.51M | 0.01% | 00.0% | Unchanged |
| LPL Financial LLC | 13,059 | $1.53M | 0.00% | +411+3.2% | Added |
| Nomura Asset Management International Inc. | 13,868 | $1.62M | 0.00% | +13,868 | New |
| Vanguard Global Advisers, LLC | 13,911 | $1.63M | 0.00% | +13,911 | New |
| Treasurer of the State of North Carolina | 14,304 | $1.67M | 0.01% | +306+2.2% | Added |
| SummitTX Capital, L.P. | 14,335 | $1.67M | 0.05% | +14,335 | New |
| Barclays PLC | 14,456 | $1.69M | 0.00% | −52,157−78.3% | Reduced |
| Susquehanna International Group, LLP | 14,999 | $1.75M | 0.00% | −8,802−37.0% | Reduced |
| Amalgamated Bank | 15,006 | $1.75M | 0.01% | −39−0.3% | Reduced |
| Storebrand Asset Management AS | 15,405 | $1.80M | 0.01% | 00.0% | Unchanged |
| Fifth Third Bancorp | 16,045 | $1.87M | 0.00% | +15,483+2,755.0% | Added |
| MetLife Investment Management | 16,406 | $1.92M | 0.01% | +111+0.7% | Added |
| Edgestream Partners, L.P. | 17,681 | $2.07M | 0.07% | +10,586+149.2% | Added |
| Susquehanna Portfolio Strategies, LLC | 18,372 | $2.15M | 0.03% | +18,372 | New |
| Worldquant Millennium Advisors LLC | 18,374 | $2.15M | 0.01% | +18,374 | New |
| Dana Investment Advisors, Inc. | 18,965 | $2.22M | 0.07% | −199−1.0% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 19,174 | $2.24M | 0.00% | +5,807+43.4% | Added |
| KBC Group NV | 19,432 | $2.27M | 0.01% | −2,790−12.6% | Reduced |
| American Century Companies Inc | 20,020 | $2.34M | 0.00% | +1,719+9.4% | Added |
| Great West Life Assurance Co | 20,005 | $2.34M | 0.00% | +674+3.5% | Added |
| South Dakota Investment Council | 20,235 | $2.36M | 0.05% | 00.0% | Unchanged |
| Ameritas Investment Partners, Inc. | 20,479 | $2.39M | 0.07% | +397+2.0% | Added |
| Duquesne Family Office LLCSuperinvestorDuquesne Family Office | 21,194 | $2.48M | 0.08% | +21,194 | New |
| Capital International Inc | 21,359 | $2.50M | 0.02% | +21,359 | New |
| AMG National Trust Bank | 23,041 | $2.69M | 0.06% | −289−1.2% | Reduced |
| State of New Jersey Common Pension Fund D | 23,658 | $2.76M | 0.01% | +23,658 | New |
| Quantbot Technologies LP | 23,936 | $2.80M | 0.11% | −15,671−39.6% | Reduced |
| State Board of Administration of Florida Retirement System | 24,115 | $2.82M | 0.01% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 24,576 | $2.87M | 0.00% | −12,435−33.6% | Reduced |
| Stifel Financial Corp | 24,925 | $2.91M | 0.00% | +6,004+31.7% | Added |
| California Public Employees Retirement System | 25,000 | $2.92M | 0.00% | −21,760−46.5% | Reduced |
| State of Wisconsin Investment Board | 25,252 | $2.95M | 0.01% | −459−1.8% | Reduced |
| Envestnet Asset Management Inc | 28,046 | $3.28M | 0.00% | +176+0.6% | Added |
| Ameriprise Financial Inc | 28,487 | $3.33M | 0.00% | −20,630−42.0% | Reduced |
| Occam Crest Management LP | 29,256 | $3.42M | 2.16% | +29,256 | New |
| Boston Partners | 31,696 | $3.70M | 0.00% | +31,696 | New |
| Manufacturers Life Insurance Company, The | 33,295 | $3.89M | 0.00% | −156−0.5% | Reduced |
| Vanguard Asset Management, Ltd | 33,358 | $3.90M | 0.00% | +33,358 | New |
| Gotham Asset Management, LLC | 34,564 | $4.04M | 0.01% | +25,365+275.7% | Added |
| CI Private Wealth, LLC | 34,971 | $4.06M | 0.01% | −15,744−31.0% | Reduced |
| Twin Tree Management, LP | 35,977 | $4.20M | 0.88% | +35,977 | New |
| Capital International Ltd | 37,300 | $4.36M | 0.16% | +37,300 | New |
| Squarepoint Ops LLC | 38,532 | $4.50M | 0.01% | +38,532 | New |
| Bank of Montreal | 39,038 | $4.56M | 0.00% | +12,115+45.0% | Added |
| Retirement Systems of Alabama | 40,886 | $4.78M | 0.02% | +859+2.1% | Added |
| BI Asset Management Fondsmaeglerselskab A/S | 42,043 | $4.91M | 0.05% | +35,006+497.5% | Added |
| Engineers Gate Manager LP | 42,499 | $4.96M | 0.06% | −246,756−85.3% | Reduced |
| Alliancebernstein L.P. | 67,315 | $4.98M | 0.00% | −1,133−1.7% | Reduced |
| Occudo Quantitative Strategies LP | 44,430 | $5.12M | 0.28% | +19,250+76.4% | Added |
| California State Teachers Retirement System | 44,459 | $5.19M | 0.01% | +8,361+23.2% | Added |
| BCJ Capital Management, LLC | 45,296 | $5.29M | 0.28% | +45,296 | New |
| Victory Capital Management Inc | 45,578 | $5.32M | 0.00% | −1,068,241−95.9% | Reduced |
| Toroso Investments, LLC | 47,820 | $5.55M | 0.02% | +47,820 | New |
| Albar Capital Partners LLP | 48,814 | $5.70M | 0.92% | +48,814 | New |
| Legal & General Group Plc | 50,737 | $5.93M | 0.00% | −6,514−11.4% | Reduced |
| Citigroup Inc | 54,559 | $6.37M | 0.00% | +27,222+99.6% | Added |
| Walleye Capital LLC | 59,814 | $6.99M | 0.04% | +12,157+25.5% | Added |
| Rokos Capital Management LLP | 60,800 | $7.10M | 0.13% | +60,800 | New |
| Lloyd Harbor Capital Management, LLC | 62,000 | $7.24M | 3.75% | +62,000 | New |
| Capital International Sarl | 63,634 | $7.43M | 0.12% | +63,634 | New |
| Mackenzie Financial Corp | 71,968 | $8.41M | 0.01% | +52,135+262.9% | Added |
| Agman Capital LLC | 72,283 | $8.44M | 6.72% | 00.0% | Unchanged |
| Cerity Partners LLC | 72,679 | $8.49M | 0.01% | −54,416−42.8% | Reduced |
| Thomist Capital Management, LP | 73,000 | $8.53M | 2.92% | −38,900−34.8% | Reduced |
| Principal Financial Group Inc | 74,481 | $8.70M | 0.00% | +2,762+3.9% | Added |
| PDT Partners, LLC | 75,777 | $8.85M | 0.52% | +10,800+16.6% | Added |
| Swiss National Bank | 75,900 | $8.87M | 0.01% | 00.0% | Unchanged |
| Meiji Yasuda Asset Management Co Ltd. | 79,478 | $9.28M | 0.46% | +79,478 | New |
| Millennium Management LLC | 84,997 | $9.93M | 0.01% | −342,757−80.1% | Reduced |
| Rhumbline Advisers | 87,304 | $10.2M | 0.01% | +1,872+2.2% | Added |
| Russell Investments Group, Ltd. | 89,362 | $10.4M | 0.01% | −68,959−43.6% | Reduced |
| JPMorgan Chase & Co | 97,739 | $11.3M | 0.00% | +30,419+45.2% | Added |
| First Trust Advisors LP | 102,299 | $12.0M | 0.01% | −44,112−30.1% | Reduced |
| Royal Bank of Canada | 103,951 | $12.1M | 0.00% | +18,681+21.9% | Added |
| Jane Street Group, LLC | 105,686 | $12.3M | 0.01% | +105,686 | New |
| Wells Fargo & Company | 106,705 | $12.5M | 0.00% | +14,826+16.1% | Added |
| Yaupon Capital Management LP | 107,044 | $12.5M | 0.62% | +107,044 | New |
| Recurrent Investment Advisors LLC | 112,790 | $13.2M | 0.79% | +37,157+49.1% | Added |
| Quantinno Capital Management LP | 121,444 | $14.2M | 0.02% | +5,078+4.4% | Added |
| Sprott Inc. | 132,610 | $15.5M | 0.47% | −7,390−5.3% | Reduced |
| Capstone Investment Advisors, LLC | 135,808 | $15.9M | 0.13% | +132,689+4,254.2% | Added |
| Robotti Robert | 145,004 | $16.9M | 2.64% | −111,240−43.4% | Reduced |
| Man Group plc | 160,286 | $18.7M | 0.04% | +160,286 | New |
| Ceredex Value Advisors LLC | 177,900 | $20.8M | 0.65% | −57,718−24.5% | Reduced |
| Teachers Retirement System of the State of Kentucky | 178,160 | $20.8M | 0.16% | +12,845+7.8% | Added |
| Invesco Ltd. | 179,402 | $21.0M | 0.00% | −33,755−15.8% | Reduced |
| Bank of New York Mellon Corp | 181,070 | $21.2M | 0.00% | +6,752+3.9% | Added |