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 |
|---|---|---|---|---|---|
| Compagnie Lombard Odier SCmA | 860 | $100.5K | 0.00% | +860 | New |
| Pickering Energy Partners LP | 1,000 | $116.8K | 0.24% | +1,000 | New |
| Sterling Capital Management LLC | 1,122 | $131.1K | 0.00% | −855−43.2% | Reduced |
| Signaturefd, LLC | 1,148 | $134.1K | 0.00% | +1,006+708.5% | Added |
| Transamerica Financial Advisors, Inc. | 1,300 | $151.9K | 0.01% | +495+61.5% | Added |
| Tower Research Capital LLC (TRC) | 1,356 | $158.4K | 0.00% | +592+77.5% | Added |
| TD Waterhouse Canada Inc. | 1,375 | $160.1K | 0.00% | +1,335+3,337.5% | Added |
| Kimelman & Baird, LLC | 1,500 | $175.2K | 0.01% | 00.0% | Unchanged |
| The PNC Financial Services Group, Inc. | 1,522 | $177.8K | 0.00% | +187+14.0% | Added |
| MAI Capital Management | 1,631 | $190.5K | 0.00% | +315+23.9% | Added |
| Allworth Financial LP | 1,701 | $198.7K | 0.00% | +263+18.3% | Added |
| Public Employees Retirement Association of Colorado | 1,704 | $199.0K | 0.00% | 00.0% | Unchanged |
| Oppenheimer & Co Inc | 1,735 | $202.7K | 0.00% | +1,735 | New |
| Virtus Investment Advisers, Inc. | 1,736 | $202.8K | 0.06% | −450−20.6% | Reduced |
| Laird Norton Trust Company, LLC | 1,752 | $204.7K | 0.00% | +1,752 | New |
| Utah Retirement Systems | 1,800 | $210.3K | 0.00% | +1,800 | New |
| Greenland Capital Management LP | 1,812 | $211.7K | 0.04% | +1,812 | New |
| Maryland State Retirement & Pension System | 1,915 | $223.7K | 0.00% | +1,915 | New |
| Cercano Management LLC | 1,978 | $231.1K | 0.01% | +1,978 | New |
| Federation des caisses Desjardins du Quebec | 1,990 | $232.5K | 0.00% | −569−22.2% | Reduced |
| Amundi | 1,997 | $233.3K | 0.00% | +1,997 | New |
| Verition Fund Management LLC | 2,000 | $233.6K | 0.00% | −24,078−92.3% | Reduced |
| Callan Family Office, LLC | 2,017 | $235.6K | 0.01% | +2,017 | New |
| Eagle Global Advisors LLC | 2,066 | $241.3K | 0.01% | +2,066 | New |
| Sivia Capital Partners, LLC | 2,099 | $245.2K | 0.05% | +2,099 | New |
| Empowered Funds, LLC | 2,162 | $252.6K | 0.00% | +2,162 | New |
| US Bancorp | 2,170 | $253.5K | 0.00% | +160+8.0% | Added |
| Hantz Financial Services, Inc. | 2,177 | $254.0K | 0.00% | +624+40.2% | Added |
| CoreFirst Bank & Trust | 2,195 | $256.4K | 0.14% | −25−1.1% | Reduced |
| Canada Pension Plan Investment Board | 2,210 | $258.2K | 0.00% | −5,721−72.1% | Reduced |
| Brown Advisory Inc | 2,226 | $260.1K | 0.00% | +2,226 | New |
| Prudential Financial Inc | 2,228 | $260.3K | 0.00% | +2,228 | New |
| CWM, LLC | 2,249 | $262.7K | 0.00% | +1,903+550.0% | Added |
| Swiss Life Asset Management Ltd | 2,253 | $263.2K | 0.00% | +2,253 | New |
| HighTower Advisors, LLC | 2,305 | $269.3K | 0.00% | +2,305 | New |
| Deutsche Bank AG | 2,370 | $276.9K | 0.00% | +1,286+118.6% | Added |
| McMahon Financial Advisors, LLC | 2,382 | $278.3K | 0.05% | +2,382 | New |
| Securian Asset Management, Inc | 2,403 | $280.7K | 0.01% | 00.0% | Unchanged |
| Voya Investment Management LLC | 2,436 | $284.6K | 0.00% | +2,436 | New |
| Archer Investment Corp | 2,493 | $291.2K | 0.06% | +2,493 | New |
| Wealth Enhancement Advisory Services, LLC | 2,588 | $309.0K | 0.00% | +2,588 | New |
| ISAM Funds (UK) Ltd | 2,835 | $331.2K | 0.16% | +7+0.2% | Added |
| Integrated Wealth Concepts LLC | 2,856 | $333.6K | 0.00% | +2,856 | New |
| Odyssean, LLC | 2,903 | $339.1K | 0.12% | 00.0% | Unchanged |
| Raymond James Financial Inc | 2,931 | $342.4K | 0.00% | −190−6.1% | Reduced |
| Twinbeech Capital LP | 2,950 | $344.6K | 0.04% | +2,950 | New |
| Thompson Siegel & Walmsley LLC | 2,976 | $348.0K | 0.01% | −533,314−99.4% | Reduced |
| Claret Asset Management Corp | 3,007 | $351.0K | 0.04% | 00.0% | Unchanged |
| Havemeyer Place LP | 3,250 | $379.7K | 0.04% | +3,250 | New |
| Sanctuary Advisors, LLC | 3,272 | $382.2K | 0.00% | −169−4.9% | Reduced |
| AlphaGrep UK Ltd | 3,316 | $387.4K | 0.11% | −155−4.5% | Reduced |
| State of Alaska, Department of Revenue | 3,354 | $391.0K | 0.00% | +45+1.4% | Added |
| Gamco Investors, Inc. Et Al | 3,491 | $407.8K | 0.00% | −450−11.4% | Reduced |
| Evergreen Capital Management LLC | 3,651 | $426.5K | 0.01% | +3,651 | New |
| Atria Investments LLC | 3,786 | $442.3K | 0.00% | −286−7.0% | Reduced |
| Marnell Management LLC | 3,802 | $444.1K | 0.30% | −7,898−67.5% | Reduced |
| Pacer Advisors, Inc. | 3,844 | $449.0K | 0.00% | −144−3.6% | Reduced |
| Cetera Investment Advisers | 3,921 | $458.0K | 0.00% | +767+24.3% | Added |
| CIBC Asset Management Inc | 3,977 | $464.6K | 0.00% | 00.0% | Unchanged |
| Xponance, Inc. | 3,988 | $465.9K | 0.00% | +887+28.6% | Added |
| Guggenheim Capital LLC | 4,119 | $481.2K | 0.00% | −55−1.3% | Reduced |
| New York State Teachers Retirement System | 4,143 | $484.0K | 0.00% | −1,082−20.7% | Reduced |
| Hartree Partners, LP | 4,300 | $502.3K | 0.11% | +4,300 | New |
| Pathstone Holdings, LLC | 4,960 | $579.4K | 0.00% | +311+6.7% | Added |
| Gsa Capital Partners LLP | 5,106 | $596.0K | 0.04% | +5,106 | New |
| CAPROCK Group, Inc. | 5,171 | $604.1K | 0.01% | +5,171 | New |
| Unison Advisors LLC | 5,247 | $613.0K | 0.05% | +32+0.6% | Added |
| Storgate, LLC | 5,510 | $643.7K | 0.50% | +130+2.4% | Added |
| Advisors Asset Management, Inc. | 5,647 | $659.7K | 0.01% | −400−6.6% | Reduced |
| Police & Firemen's Retirement System of New Jersey | 5,684 | $664.0K | 0.01% | 00.0% | Unchanged |
| Skopos Labs, Inc. | 5,705 | $666.5K | 0.02% | +5,705 | New |
| Mercer Global Advisors Inc | 5,717 | $667.8K | 0.00% | +1,794+45.7% | Added |
| Pictet Asset Management Holding SA | 6,059 | $707.8K | 0.00% | +34+0.6% | Added |
| RiverFront Investment Group, LLC | 6,497 | $759.0K | 0.01% | 00.0% | Unchanged |
| Concentric Capital Strategies, LP | 6,517 | $761.3K | 0.07% | +6,517 | New |
| Allstate Corp | 6,575 | $768.1K | 0.01% | +6,575 | New |
| Pettee Investors, Inc. | 6,711 | $773.6K | 0.40% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 6,690 | $781.5K | 0.00% | −85,533−92.7% | Reduced |
| Oregon Public Employees Retirement Fund | 6,868 | $802.3K | 0.01% | +200+3.0% | Added |
| New Mexico Educational Retirement Board | 7,000 | $818.0K | 0.03% | 00.0% | Unchanged |
| First Eagle Investment Management, LLC | 7,118 | $831.5K | 0.00% | +7,065+13,330.2% | Added |
| Gateway Investment Advisers LLC | 7,147 | $834.9K | 0.01% | +7,147 | New |
| Dynamic Technology Lab Private Ltd | 7,352 | $858.9K | 0.14% | +7,352 | New |
| Northwestern Mutual Investment Management Company, LLC | 7,472 | $872.9K | 0.01% | +10+0.1% | Added |
| Thrivent Financial for Lutherans | 7,514 | $878.0K | 0.00% | +4+0.1% | Added |
| Eurizon Capital SGR S.p.A. | 7,518 | $878.2K | 0.00% | +7,518 | New |
| Capital Group Investment Management Pte. Ltd. | 7,693 | $898.7K | 0.15% | +7,693 | New |
| Total Wealth Planning & Management, Inc. | 7,707 | $900.3K | 0.71% | +4,752+160.8% | 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 |
| Aster Capital Management (DIFC) Ltd | 9,428 | $943.1K | 0.31% | +8,608+1,049.8% | Added |
| Winton Group Ltd | 8,229 | $961.3K | 0.03% | +8,229 | New |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 8,356 | $976.1K | 0.00% | +10+0.1% | Added |
| KLP Kapitalforvaltning AS | 8,500 | $993.0K | 0.00% | +300+3.7% | Added |
| Handelsbanken Fonder AB | 8,900 | $1.04M | 0.00% | 00.0% | Unchanged |
| JustInvest LLC | 9,463 | $1.11M | 0.01% | −292−3.0% | Reduced |
| Virtu Financial LLC | 9,532 | $1.11M | 0.05% | +9,532 | New |
| CWM Advisors, LLC | 9,576 | $1.12M | 0.07% | +5,172+117.4% | Added |
| Louisiana State Employees Retirement System | 9,700 | $1.13M | 0.02% | +500+5.4% | Added |
| Public Employees Retirement System of Ohio | 9,724 | $1.14M | 0.00% | −332−3.3% | Reduced |