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 |
|---|---|---|---|---|---|
| State of New Jersey Common Pension Fund D | 23,658 | $2.76M | 0.01% | +23,658 | New |
| AMG National Trust Bank | 23,041 | $2.69M | 0.06% | −289−1.2% | Reduced |
| Capital International Inc | 21,359 | $2.50M | 0.02% | +21,359 | New |
| Duquesne Family Office LLCSuperinvestorDuquesne Family Office | 21,194 | $2.48M | 0.08% | +21,194 | New |
| Ameritas Investment Partners, Inc. | 20,479 | $2.39M | 0.07% | +397+2.0% | Added |
| South Dakota Investment Council | 20,235 | $2.36M | 0.05% | 00.0% | Unchanged |
| Great West Life Assurance Co | 20,005 | $2.34M | 0.00% | +674+3.5% | Added |
| American Century Companies Inc | 20,020 | $2.34M | 0.00% | +1,719+9.4% | Added |
| KBC Group NV | 19,432 | $2.27M | 0.01% | −2,790−12.6% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 19,174 | $2.24M | 0.00% | +5,807+43.4% | Added |
| Dana Investment Advisors, Inc. | 18,965 | $2.22M | 0.07% | −199−1.0% | Reduced |
| Worldquant Millennium Advisors LLC | 18,374 | $2.15M | 0.01% | +18,374 | New |
| Susquehanna Portfolio Strategies, LLC | 18,372 | $2.15M | 0.03% | +18,372 | New |
| Edgestream Partners, L.P. | 17,681 | $2.07M | 0.07% | +10,586+149.2% | Added |
| MetLife Investment Management | 16,406 | $1.92M | 0.01% | +111+0.7% | Added |
| Fifth Third Bancorp | 16,045 | $1.87M | 0.00% | +15,483+2,755.0% | Added |
| Storebrand Asset Management AS | 15,405 | $1.80M | 0.01% | 00.0% | Unchanged |
| Amalgamated Bank | 15,006 | $1.75M | 0.01% | −39−0.3% | Reduced |
| Susquehanna International Group, LLP | 14,999 | $1.75M | 0.00% | −8,802−37.0% | Reduced |
| Barclays PLC | 14,456 | $1.69M | 0.00% | −52,157−78.3% | Reduced |
| SummitTX Capital, L.P. | 14,335 | $1.67M | 0.05% | +14,335 | New |
| Treasurer of the State of North Carolina | 14,304 | $1.67M | 0.01% | +306+2.2% | Added |
| Vanguard Global Advisers, LLC | 13,911 | $1.63M | 0.00% | +13,911 | New |
| Nomura Asset Management International Inc. | 13,868 | $1.62M | 0.00% | +13,868 | New |
| LPL Financial LLC | 13,059 | $1.53M | 0.00% | +411+3.2% | Added |
| State of Tennessee, Treasury Department | 12,946 | $1.51M | 0.01% | 00.0% | Unchanged |
| XTX Topco Ltd | 12,878 | $1.50M | 0.03% | +12,878 | New |
| Mutual of America Capital Management LLC | 12,780 | $1.49M | 0.02% | −1,100−7.9% | Reduced |
| SEI Investments Co | 12,769 | $1.49M | 0.00% | −15,673−55.1% | Reduced |
| Summit Trail Advisors, LLC | 12,524 | $1.46M | 0.02% | −3,037−19.5% | Reduced |
| Polymer Capital Management (US) LLC | 12,520 | $1.46M | 0.22% | +6,020+92.6% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 12,479 | $1.46M | 0.00% | +3,297+35.9% | Added |
| Creative Planning | 11,961 | $1.40M | 0.00% | +4,276+55.6% | Added |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 11,262 | $1.32M | 0.00% | +1,282+12.8% | Added |
| Arizona State Retirement System | 10,580 | $1.24M | 0.01% | −214−2.0% | Reduced |
| Yousif Capital Management, LLC | 10,518 | $1.23M | 0.01% | −537−4.9% | Reduced |
| Schonfeld Strategic Advisors LLC | 10,182 | $1.19M | 0.01% | +4,170+69.4% | Added |
| Walnut Level Capital LLC | 10,000 | $1.17M | 1.33% | −1,404−12.3% | Reduced |
| Vanguard Investments Australia, Ltd. | 9,932 | $1.16M | 0.00% | +9,932 | New |
| Public Employees Retirement System of Ohio | 9,724 | $1.14M | 0.00% | −332−3.3% | Reduced |
| Louisiana State Employees Retirement System | 9,700 | $1.13M | 0.02% | +500+5.4% | Added |
| CWM Advisors, LLC | 9,576 | $1.12M | 0.07% | +5,172+117.4% | Added |
| Virtu Financial LLC | 9,532 | $1.11M | 0.05% | +9,532 | New |
| JustInvest LLC | 9,463 | $1.11M | 0.01% | −292−3.0% | Reduced |
| Handelsbanken Fonder AB | 8,900 | $1.04M | 0.00% | 00.0% | Unchanged |
| KLP Kapitalforvaltning AS | 8,500 | $993.0K | 0.00% | +300+3.7% | Added |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 8,356 | $976.1K | 0.00% | +10+0.1% | Added |
| Winton Group Ltd | 8,229 | $961.3K | 0.03% | +8,229 | New |
| Aster Capital Management (DIFC) Ltd | 9,428 | $943.1K | 0.31% | +8,608+1,049.8% | Added |
| State of Michigan Retirement System | 8,000 | $934.6K | 0.00% | +100+1.3% | Added |
| Twin Focus Capital Partners, LLC | 8,000 | $934.6K | 0.11% | +8,000 | New |
| Total Wealth Planning & Management, Inc. | 7,707 | $900.3K | 0.71% | +4,752+160.8% | Added |
| Capital Group Investment Management Pte. Ltd. | 7,693 | $898.7K | 0.15% | +7,693 | New |
| Eurizon Capital SGR S.p.A. | 7,518 | $878.2K | 0.00% | +7,518 | New |
| Thrivent Financial for Lutherans | 7,514 | $878.0K | 0.00% | +4+0.1% | Added |
| Northwestern Mutual Investment Management Company, LLC | 7,472 | $872.9K | 0.01% | +10+0.1% | Added |
| Dynamic Technology Lab Private Ltd | 7,352 | $858.9K | 0.14% | +7,352 | New |
| Gateway Investment Advisers LLC | 7,147 | $834.9K | 0.01% | +7,147 | New |
| First Eagle Investment Management, LLC | 7,118 | $831.5K | 0.00% | +7,065+13,330.2% | Added |
| New Mexico Educational Retirement Board | 7,000 | $818.0K | 0.03% | 00.0% | Unchanged |
| Oregon Public Employees Retirement Fund | 6,868 | $802.3K | 0.01% | +200+3.0% | Added |
| BNP Paribas Arbitrage, SA | 6,690 | $781.5K | 0.00% | −85,533−92.7% | Reduced |
| Pettee Investors, Inc. | 6,711 | $773.6K | 0.40% | 00.0% | Unchanged |
| Allstate Corp | 6,575 | $768.1K | 0.01% | +6,575 | New |
| Concentric Capital Strategies, LP | 6,517 | $761.3K | 0.07% | +6,517 | New |
| RiverFront Investment Group, LLC | 6,497 | $759.0K | 0.01% | 00.0% | Unchanged |
| Pictet Asset Management Holding SA | 6,059 | $707.8K | 0.00% | +34+0.6% | Added |
| Mercer Global Advisors Inc | 5,717 | $667.8K | 0.00% | +1,794+45.7% | Added |
| Skopos Labs, Inc. | 5,705 | $666.5K | 0.02% | +5,705 | New |
| Police & Firemen's Retirement System of New Jersey | 5,684 | $664.0K | 0.01% | 00.0% | Unchanged |
| Advisors Asset Management, Inc. | 5,647 | $659.7K | 0.01% | −400−6.6% | Reduced |
| Storgate, LLC | 5,510 | $643.7K | 0.50% | +130+2.4% | Added |
| Unison Advisors LLC | 5,247 | $613.0K | 0.05% | +32+0.6% | Added |
| CAPROCK Group, Inc. | 5,171 | $604.1K | 0.01% | +5,171 | New |
| Gsa Capital Partners LLP | 5,106 | $596.0K | 0.04% | +5,106 | New |
| Pathstone Holdings, LLC | 4,960 | $579.4K | 0.00% | +311+6.7% | Added |
| Hartree Partners, LP | 4,300 | $502.3K | 0.11% | +4,300 | New |
| New York State Teachers Retirement System | 4,143 | $484.0K | 0.00% | −1,082−20.7% | Reduced |
| Guggenheim Capital LLC | 4,119 | $481.2K | 0.00% | −55−1.3% | Reduced |
| Xponance, Inc. | 3,988 | $465.9K | 0.00% | +887+28.6% | Added |
| CIBC Asset Management Inc | 3,977 | $464.6K | 0.00% | 00.0% | Unchanged |
| Cetera Investment Advisers | 3,921 | $458.0K | 0.00% | +767+24.3% | Added |
| Pacer Advisors, Inc. | 3,844 | $449.0K | 0.00% | −144−3.6% | Reduced |
| Marnell Management LLC | 3,802 | $444.1K | 0.30% | −7,898−67.5% | Reduced |
| Atria Investments LLC | 3,786 | $442.3K | 0.00% | −286−7.0% | Reduced |
| Evergreen Capital Management LLC | 3,651 | $426.5K | 0.01% | +3,651 | New |
| Gamco Investors, Inc. Et Al | 3,491 | $407.8K | 0.00% | −450−11.4% | Reduced |
| State of Alaska, Department of Revenue | 3,354 | $391.0K | 0.00% | +45+1.4% | Added |
| AlphaGrep UK Ltd | 3,316 | $387.4K | 0.11% | −155−4.5% | Reduced |
| Sanctuary Advisors, LLC | 3,272 | $382.2K | 0.00% | −169−4.9% | Reduced |
| Havemeyer Place LP | 3,250 | $379.7K | 0.04% | +3,250 | New |
| Claret Asset Management Corp | 3,007 | $351.0K | 0.04% | 00.0% | Unchanged |
| Thompson Siegel & Walmsley LLC | 2,976 | $348.0K | 0.01% | −533,314−99.4% | Reduced |
| Twinbeech Capital LP | 2,950 | $344.6K | 0.04% | +2,950 | New |
| Raymond James Financial Inc | 2,931 | $342.4K | 0.00% | −190−6.1% | Reduced |
| Odyssean, LLC | 2,903 | $339.1K | 0.12% | 00.0% | Unchanged |
| Integrated Wealth Concepts LLC | 2,856 | $333.6K | 0.00% | +2,856 | New |
| ISAM Funds (UK) Ltd | 2,835 | $331.2K | 0.16% | +7+0.2% | Added |
| Wealth Enhancement Advisory Services, LLC | 2,588 | $309.0K | 0.00% | +2,588 | New |
| Archer Investment Corp | 2,493 | $291.2K | 0.06% | +2,493 | New |