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, Q4 2025
Institutional positions in Westlake Corp as of Dec 31, 2025. 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
- 298
- −1 vs. Q3 2025
- Shares held
- 46.4M
- +4.91M (+11.8%) vs. Q3 2025
- Total value
- $3.43B
- +$234.7M (+7.3%) vs. Q3 2025
- New holders
- 63
- 93 more added
- Sold out
- 64
- 112 more reduced
6 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding Westlake Corp; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Hantz Financial Services, Inc. | 1,553 | $115.0K | 0.00% | +813+109.9% | Added |
| Covestor Ltd | 1,662 | $123.0K | 0.06% | −117−6.6% | Reduced |
| Public Employees Retirement Association of Colorado | 1,704 | $126.0K | 0.00% | 00.0% | Unchanged |
| Manning & Napier Advisors LLC | 1,745 | $130.7K | 0.00% | −2,443−58.3% | Reduced |
| Sterling Capital Management LLC | 1,977 | $146.2K | 0.00% | −89−4.3% | Reduced |
| Simplex Trading, LLC | 1,981 | $146.5K | 0.00% | +1,981 | New |
| US Bancorp | 2,010 | $148.6K | 0.00% | −423−17.4% | Reduced |
| Virtus Investment Advisers, Inc. | 2,186 | $161.6K | 0.04% | +2,186 | New |
| CoreFirst Bank & Trust | 2,220 | $164.1K | 0.09% | −30−1.3% | Reduced |
| Securian Asset Management, Inc | 2,403 | $177.7K | 0.01% | 00.0% | Unchanged |
| Lloyd Advisory Services, LLC. | 2,445 | $180.8K | 0.07% | +2,445 | New |
| Federation des caisses Desjardins du Quebec | 2,559 | $189.2K | 0.00% | +372+17.0% | Added |
| ISAM Funds (UK) Ltd | 2,828 | $209.1K | 0.08% | +2,828 | New |
| Odyssean, LLC | 2,903 | $214.6K | 0.15% | +2,903 | New |
| Total Wealth Planning & Management, Inc. | 2,955 | $218.5K | 0.17% | +2,955 | New |
| Claret Asset Management Corp | 3,007 | $222.0K | 0.03% | −7−0.2% | Reduced |
| Xponance, Inc. | 3,101 | $229.3K | 0.00% | −638−17.1% | Reduced |
| Capstone Investment Advisors, LLC | 3,119 | $230.6K | 0.00% | +3,119 | New |
| Raymond James Financial Inc | 3,121 | $230.8K | 0.00% | −1,635−34.4% | Reduced |
| Cetera Investment Advisers | 3,154 | $233.2K | 0.00% | −1,527−32.6% | Reduced |
| State of Alaska, Department of Revenue | 3,309 | $244.0K | 0.00% | −340−9.3% | Reduced |
| Sanctuary Advisors, LLC | 3,441 | $254.4K | 0.00% | −108−3.0% | Reduced |
| AlphaGrep UK Ltd | 3,471 | $256.6K | 0.09% | +3,471 | New |
| Dark Forest Capital Management LP | 3,750 | $277.3K | 0.01% | −53,742−93.5% | Reduced |
| Assenagon Asset Management S.A. | 3,790 | $280.2K | 0.00% | +3,790 | New |
| Mercer Global Advisors Inc | 3,923 | $290.1K | 0.00% | −318−7.5% | Reduced |
| Gamco Investors, Inc. Et Al | 3,941 | $291.4K | 0.00% | −200−4.8% | Reduced |
| CIBC Asset Management Inc | 3,977 | $294.1K | 0.00% | −402−9.2% | Reduced |
| Pacer Advisors, Inc. | 3,988 | $294.9K | 0.00% | −2,022−33.6% | Reduced |
| Atria Investments LLC | 4,072 | $301.1K | 0.00% | +239+6.2% | Added |
| Daiwa Securities Group Inc. | 4,108 | $304.0K | 0.00% | +117+2.9% | Added |
| Ci Investments Inc. | 4,128 | $305.2K | 0.00% | −56−1.3% | Reduced |
| Guggenheim Capital LLC | 4,174 | $308.6K | 0.00% | +4,174 | New |
| CWM Advisors, LLC | 4,404 | $325.6K | 0.03% | +412+10.3% | Added |
| Caxton Associates LLP | 4,615 | $341.2K | 0.01% | +4,615 | New |
| Pathstone Holdings, LLC | 4,649 | $343.7K | 0.00% | −4,355−48.4% | Reduced |
| Quest Partners LLC | 5,192 | $383.9K | 0.02% | +4,548+706.2% | Added |
| Unison Advisors LLC | 5,215 | $385.6K | 0.03% | +35+0.7% | Added |
| New York State Teachers Retirement System | 5,225 | $386.0K | 0.00% | 00.0% | Unchanged |
| Storgate, LLC | 5,380 | $397.8K | 0.33% | +5,380 | New |
| Police & Firemen's Retirement System of New Jersey | 5,684 | $420.3K | 0.00% | 00.0% | Unchanged |
| Numerai GP LLC | 5,792 | $428.3K | 0.05% | +5,792 | New |
| Schonfeld Strategic Advisors LLC | 6,012 | $444.5K | 0.00% | −39,978−86.9% | Reduced |
| Pictet Asset Management Holding SA | 6,025 | $445.5K | 0.00% | +6,025 | New |
| Advisors Asset Management, Inc. | 6,047 | $447.1K | 0.01% | −1,574−20.7% | Reduced |
| RiverFront Investment Group, LLC | 6,497 | $480.4K | 0.01% | −475−6.8% | Reduced |
| Polymer Capital Management (US) LLC | 6,500 | $480.6K | 0.06% | −9,700−59.9% | Reduced |
| Oregon Public Employees Retirement Fund | 6,668 | $493.0K | 0.01% | 00.0% | Unchanged |
| Pettee Investors, Inc. | 6,711 | $496.2K | 0.28% | 00.0% | Unchanged |
| New Mexico Educational Retirement Board | 7,000 | $518.0K | 0.02% | 00.0% | Unchanged |
| BI Asset Management Fondsmaeglerselskab A/S | 7,037 | $520.0K | 0.00% | +3,338+90.2% | Added |
| Edgestream Partners, L.P. | 7,095 | $524.6K | 0.01% | +7,095 | New |
| Oak Thistle LLC | 7,170 | $530.1K | 0.07% | +7,170 | New |
| Northwestern Mutual Investment Management Company, LLC | 7,462 | $551.7K | 0.01% | +30+0.4% | Added |
| Thrivent Financial for Lutherans | 7,510 | $555.0K | 0.00% | −151−2.0% | Reduced |
| Creative Planning | 7,685 | $568.2K | 0.00% | −5,644−42.3% | Reduced |
| State of Wyoming | 7,824 | $578.5K | 0.06% | +7,824 | New |
| DekaBank Deutsche Girozentrale | 3,540 | $583.0K | 0.00% | 00.0% | Unchanged |
| State of Michigan Retirement System | 7,900 | $584.1K | 0.00% | 00.0% | Unchanged |
| Canada Pension Plan Investment Board | 7,931 | $586.4K | 0.00% | +2,721+52.2% | Added |
| KLP Kapitalforvaltning AS | 8,200 | $606.3K | 0.00% | +8,200 | New |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 8,346 | $617.1K | 0.00% | −212−2.5% | Reduced |
| Handelsbanken Fonder AB | 8,900 | $658.0K | 0.00% | +400+4.7% | Added |
| Alpine Woods Capital Investors, LLC | 8,989 | $664.6K | 0.16% | +8,989 | New |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 9,182 | $678.9K | 0.00% | −291−3.1% | Reduced |
| Gotham Asset Management, LLC | 9,199 | $680.2K | 0.00% | −12,866−58.3% | Reduced |
| Louisiana State Employees Retirement System | 9,200 | $680.2K | 0.01% | −100−1.1% | Reduced |
| Brevan Howard Capital Management LP | 9,468 | $700.1K | 0.01% | +2,062+27.8% | Added |
| JustInvest LLC | 9,755 | $721.3K | 0.01% | +411+4.4% | Added |
| Weiss Asset Management LP | 9,928 | $734.1K | 0.01% | +9,928 | New |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 9,980 | $740.0K | 0.00% | +3,628+57.1% | Added |
| Public Employees Retirement System of Ohio | 10,056 | $743.5K | 0.00% | −382−3.7% | Reduced |
| Arizona State Retirement System | 10,794 | $798.1K | 0.00% | +10,794 | New |
| Walnut Level Capital LLC | 11,404 | $843.2K | 0.67% | −46,275−80.2% | Reduced |
| Marnell Management LLC | 11,700 | $865.1K | 0.66% | +11,700 | New |
| Yousif Capital Management, LLC | 11,055 | $927.7K | 0.01% | −162−1.4% | Reduced |
| LPL Financial LLC | 12,648 | $935.2K | 0.00% | +279+2.3% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 13,367 | $988.4K | 0.00% | +13,367 | New |
| Mutual of America Capital Management LLC | 13,880 | $1.03M | 0.01% | −1,520−9.9% | Reduced |
| State of Tennessee, Treasury Department | 12,946 | $1.03M | 0.00% | +7,933+158.2% | Added |
| Treasurer of the State of North Carolina | 13,998 | $1.03M | 0.00% | −1,024−6.8% | Reduced |
| Amalgamated Bank | 15,045 | $1.11M | 0.01% | −257−1.7% | Reduced |
| Storebrand Asset Management AS | 15,405 | $1.14M | 0.00% | −40,724−72.6% | Reduced |
| Summit Trail Advisors, LLC | 15,561 | $1.15M | 0.02% | +2,391+18.2% | Added |
| Sciencast Management LP | 15,619 | $1.15M | 0.16% | +15,619 | New |
| MetLife Investment Management | 16,295 | $1.20M | 0.01% | −843−4.9% | Reduced |
| Jump Financial, LLC | 17,600 | $1.30M | 0.02% | −60,294−77.4% | Reduced |
| American Century Companies Inc | 18,301 | $1.35M | 0.00% | +190+1.0% | Added |
| Stifel Financial Corp | 18,921 | $1.40M | 0.00% | +2,158+12.9% | Added |
| Dana Investment Advisors, Inc. | 19,164 | $1.42M | 0.04% | −33−0.2% | Reduced |
| Great West Life Assurance Co | 19,331 | $1.43M | 0.00% | +4,124+27.1% | Added |
| Alberta Investment Management Corp | 19,700 | $1.46M | 0.01% | +19,700 | New |
| Mackenzie Financial Corp | 19,833 | $1.48M | 0.00% | −5,487−21.7% | Reduced |
| Ameritas Investment Partners, Inc. | 20,082 | $1.48M | 0.05% | +1,442+7.7% | Added |
| Entropy Technologies, LP | 20,137 | $1.49M | 0.08% | +14,320+246.2% | Added |
| South Dakota Investment Council | 20,235 | $1.50M | 0.03% | −2,200−9.8% | Reduced |
| AQR Capital Management LLC | 20,535 | $1.52M | 0.00% | −31,987−60.9% | Reduced |
| KBC Group NV | 22,222 | $1.64M | 0.00% | −5,334−19.4% | Reduced |
| AMG National Trust Bank | 23,330 | $1.73M | 0.04% | +23,330 | New |
| Susquehanna International Group, LLP | 23,801 | $1.76M | 0.00% | +14,957+169.1% | Added |