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 |
|---|---|---|---|---|---|
| Voya Investment Management LLC | 2,436 | $284.6K | 0.00% | +2,436 | New |
| Securian Asset Management, Inc | 2,403 | $280.7K | 0.01% | 00.0% | Unchanged |
| McMahon Financial Advisors, LLC | 2,382 | $278.3K | 0.05% | +2,382 | New |
| Deutsche Bank AG | 2,370 | $276.9K | 0.00% | +1,286+118.6% | Added |
| HighTower Advisors, LLC | 2,305 | $269.3K | 0.00% | +2,305 | New |
| Swiss Life Asset Management Ltd | 2,253 | $263.2K | 0.00% | +2,253 | New |
| CWM, LLC | 2,249 | $262.7K | 0.00% | +1,903+550.0% | Added |
| Prudential Financial Inc | 2,228 | $260.3K | 0.00% | +2,228 | New |
| Brown Advisory Inc | 2,226 | $260.1K | 0.00% | +2,226 | New |
| Canada Pension Plan Investment Board | 2,210 | $258.2K | 0.00% | −5,721−72.1% | Reduced |
| CoreFirst Bank & Trust | 2,195 | $256.4K | 0.14% | −25−1.1% | Reduced |
| Hantz Financial Services, Inc. | 2,177 | $254.0K | 0.00% | +624+40.2% | Added |
| US Bancorp | 2,170 | $253.5K | 0.00% | +160+8.0% | Added |
| Empowered Funds, LLC | 2,162 | $252.6K | 0.00% | +2,162 | New |
| Sivia Capital Partners, LLC | 2,099 | $245.2K | 0.05% | +2,099 | New |
| Eagle Global Advisors LLC | 2,066 | $241.3K | 0.01% | +2,066 | New |
| Callan Family Office, LLC | 2,017 | $235.6K | 0.01% | +2,017 | New |
| Verition Fund Management LLC | 2,000 | $233.6K | 0.00% | −24,078−92.3% | Reduced |
| Amundi | 1,997 | $233.3K | 0.00% | +1,997 | New |
| Federation des caisses Desjardins du Quebec | 1,990 | $232.5K | 0.00% | −569−22.2% | Reduced |
| Cercano Management LLC | 1,978 | $231.1K | 0.01% | +1,978 | New |
| Maryland State Retirement & Pension System | 1,915 | $223.7K | 0.00% | +1,915 | New |
| Greenland Capital Management LP | 1,812 | $211.7K | 0.04% | +1,812 | New |
| Utah Retirement Systems | 1,800 | $210.3K | 0.00% | +1,800 | New |
| Laird Norton Trust Company, LLC | 1,752 | $204.7K | 0.00% | +1,752 | New |
| Virtus Investment Advisers, Inc. | 1,736 | $202.8K | 0.06% | −450−20.6% | Reduced |
| Oppenheimer & Co Inc | 1,735 | $202.7K | 0.00% | +1,735 | New |
| Public Employees Retirement Association of Colorado | 1,704 | $199.0K | 0.00% | 00.0% | Unchanged |
| Allworth Financial LP | 1,701 | $198.7K | 0.00% | +263+18.3% | Added |
| MAI Capital Management | 1,631 | $190.5K | 0.00% | +315+23.9% | Added |
| The PNC Financial Services Group, Inc. | 1,522 | $177.8K | 0.00% | +187+14.0% | Added |
| Kimelman & Baird, LLC | 1,500 | $175.2K | 0.01% | 00.0% | Unchanged |
| TD Waterhouse Canada Inc. | 1,375 | $160.1K | 0.00% | +1,335+3,337.5% | Added |
| Tower Research Capital LLC (TRC) | 1,356 | $158.4K | 0.00% | +592+77.5% | Added |
| Transamerica Financial Advisors, Inc. | 1,300 | $151.9K | 0.01% | +495+61.5% | Added |
| Signaturefd, LLC | 1,148 | $134.1K | 0.00% | +1,006+708.5% | Added |
| Sterling Capital Management LLC | 1,122 | $131.1K | 0.00% | −855−43.2% | Reduced |
| Pickering Energy Partners LP | 1,000 | $116.8K | 0.24% | +1,000 | New |
| Compagnie Lombard Odier SCmA | 860 | $100.5K | 0.00% | +860 | New |
| Rockefeller Capital Management L.P. | 857 | $100.1K | 0.00% | −98−10.3% | Reduced |
| Parallel Advisors, LLC | 830 | $97.0K | 0.00% | +475+133.8% | Added |
| STRS Ohio | 799 | $93.3K | 0.00% | −1−0.1% | Reduced |
| GWM Advisors LLC | 689 | $80.5K | 0.00% | −56−7.5% | Reduced |
| Nomura Asset Management Co Ltd | 670 | $78.3K | 0.00% | −226−25.2% | Reduced |
| Covestor Ltd | 541 | $63.0K | 0.04% | −1,121−67.4% | Reduced |
| Exchange Traded Concepts, LLC | 536 | $62.6K | 0.00% | +536 | New |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 535 | $62.5K | 0.00% | +197+58.3% | Added |
| GAMMA Investing LLC | 531 | $62.0K | 0.00% | +67+14.4% | Added |
| Walleye Trading LLC | 514 | $60.0K | 0.00% | +514 | New |
| RWM Asset Management, LLC | 510 | $59.6K | 0.01% | +510 | New |
| Quadrant Capital Group LLC | 382 | $44.6K | 0.00% | −65−14.5% | Reduced |
| Jones Financial Companies LLLP | 361 | $40.8K | 0.00% | +55+18.0% | Added |
| Umb Bank N A | 312 | $36.4K | 0.00% | −81−20.6% | Reduced |
| Farther Finance Advisors, LLC | 289 | $33.7K | 0.00% | −11−3.7% | Reduced |
| Massmutual Trust Co FSB | 274 | $32.0K | 0.00% | 00.0% | Unchanged |
| Deseret Mutual Benefit Administrators | 248 | $29.0K | 0.01% | +115+86.5% | Added |
| Quent Capital, LLC | 238 | $27.8K | 0.00% | +6+2.6% | Added |
| EverSource Wealth Advisors, LLC | 234 | $27.3K | 0.00% | +64+37.6% | Added |
| SRS Capital Advisors, Inc. | 232 | $27.1K | 0.00% | +212+1,060.0% | Added |
| Smartleaf Asset Management LLC | 213 | $24.7K | 0.00% | +112+110.9% | Added |
| NBC Securities, Inc. | 200 | $23.4K | 0.00% | −4−2.0% | Reduced |
| Advisor Group Holdings, Inc. | 190 | $22.2K | 0.00% | −90−32.1% | Reduced |
| Advisory Services Network, LLC | 187 | $21.8K | 0.00% | +187 | New |
| Nisa Investment Advisors, LLC | 185 | $21.6K | 0.00% | +135+270.0% | Added |
| National Bank of Canada | 182 | $21.3K | 0.00% | −93−33.8% | Reduced |
| Spire Wealth Management | 172 | $20.1K | 0.00% | −134−43.8% | Reduced |
| Root Financial Partners, LLC | 172 | $20.1K | 0.00% | +148+616.7% | Added |
| Cullen/Frost Bankers, Inc. | 165 | $19.3K | 0.00% | +1+0.6% | Added |
| Los Angeles Capital Management LLC | 157 | $18.3K | 0.00% | 00.0% | Unchanged |
| Huntington National Bank | 119 | $13.9K | 0.00% | 00.0% | Unchanged |
| Versant Capital Management, Inc | 101 | $11.8K | 0.00% | +83+461.1% | Added |
| Ancora Advisors, LLC | 97 | $11.3K | 0.00% | 00.0% | Unchanged |
| Private Trust Co NA | 90 | $10.5K | 0.00% | 00.0% | Unchanged |
| CVA Family Office, LLC | 84 | $9.81K | 0.00% | +84 | New |
| Parkside Financial Bank & Trust | 68 | $7.94K | 0.00% | −200−74.6% | Reduced |
| Golden State Equity Partners | 66 | $7.71K | 0.00% | +66 | New |
| Rakuten Securities, Inc. | 64 | $7.48K | 0.00% | +58+966.7% | Added |
| Bessemer Group Inc | 60 | $7.00K | 0.00% | +60 | New |
| Pinnacle Wealth Planning Services, Inc. | 58 | $6.78K | 0.00% | 00.0% | Unchanged |
| Larson Financial Group LLC | 57 | $6.66K | 0.00% | +34+147.8% | Added |
| Brown Brothers Harriman & Co | 55 | $6.42K | 0.00% | +34+161.9% | Added |
| Sachetta, LLC | 54 | $6.31K | 0.00% | 00.0% | Unchanged |
| Fortitude Family Office, LLC | 52 | $6.08K | 0.00% | +42+420.0% | Added |
| Rothschild Investment LLC | 47 | $5.49K | 0.00% | +32+213.3% | Added |
| Basecamp Wealth Advisors LLC | 45 | $5.26K | 0.00% | +5+12.5% | Added |
| Assetmark, Inc | 44 | $5.14K | 0.00% | +5+12.8% | Added |
| Private Wealth Management Group, LLC | 36 | $4.21K | 0.00% | 00.0% | Unchanged |
| Purpose Unlimited Inc. | 34 | $3.97K | 0.00% | +34 | New |
| Transce3nd, LLC | 33 | $3.85K | 0.03% | −38−53.5% | Reduced |
| Harbour Investments, Inc. | 32 | $3.74K | 0.00% | −5−13.5% | Reduced |
| Bruce G. Allen Investments, LLC | 31 | $3.62K | 0.00% | 00.0% | Unchanged |
| Farmers & Merchants Investments Inc | 30 | $3.50K | 0.00% | 00.0% | Unchanged |
| JFS Wealth Advisors, LLC | 30 | $3.50K | 0.00% | +16+114.3% | Added |
| Keating Financial Advisory Services, Inc. | 30 | $3.50K | 0.00% | +29+2,900.0% | Added |
| True Wealth Design, LLC | 27 | $3.15K | 0.00% | +9+50.0% | Added |
| CoreCap Advisors, LLC | 24 | $2.80K | 0.00% | 00.0% | Unchanged |
| First Horizon Corp | 24 | $2.80K | 0.00% | 00.0% | Unchanged |
| Peterson Wealth Services | 23 | $2.69K | 0.00% | 00.0% | Unchanged |
| SJS Investment Consulting Inc. | 22 | $2.57K | 0.00% | +22 | New |
| Manchester Capital Management LLC | 21 | $2.45K | 0.00% | 00.0% | Unchanged |