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 |
|---|---|---|---|---|---|
| KBC Group NV | 22,222 | $1.64M | 0.00% | −5,334−19.4% | Reduced |
| AQR Capital Management LLC | 20,535 | $1.52M | 0.00% | −31,987−60.9% | Reduced |
| South Dakota Investment Council | 20,235 | $1.50M | 0.03% | −2,200−9.8% | Reduced |
| Entropy Technologies, LP | 20,137 | $1.49M | 0.08% | +14,320+246.2% | Added |
| Ameritas Investment Partners, Inc. | 20,082 | $1.48M | 0.05% | +1,442+7.7% | Added |
| Mackenzie Financial Corp | 19,833 | $1.48M | 0.00% | −5,487−21.7% | Reduced |
| Alberta Investment Management Corp | 19,700 | $1.46M | 0.01% | +19,700 | New |
| Great West Life Assurance Co | 19,331 | $1.43M | 0.00% | +4,124+27.1% | Added |
| Dana Investment Advisors, Inc. | 19,164 | $1.42M | 0.04% | −33−0.2% | Reduced |
| Stifel Financial Corp | 18,921 | $1.40M | 0.00% | +2,158+12.9% | Added |
| American Century Companies Inc | 18,301 | $1.35M | 0.00% | +190+1.0% | Added |
| Jump Financial, LLC | 17,600 | $1.30M | 0.02% | −60,294−77.4% | Reduced |
| MetLife Investment Management | 16,295 | $1.20M | 0.01% | −843−4.9% | Reduced |
| Sciencast Management LP | 15,619 | $1.15M | 0.16% | +15,619 | New |
| Summit Trail Advisors, LLC | 15,561 | $1.15M | 0.02% | +2,391+18.2% | Added |
| Storebrand Asset Management AS | 15,405 | $1.14M | 0.00% | −40,724−72.6% | Reduced |
| Amalgamated Bank | 15,045 | $1.11M | 0.01% | −257−1.7% | Reduced |
| Treasurer of the State of North Carolina | 13,998 | $1.03M | 0.00% | −1,024−6.8% | Reduced |
| State of Tennessee, Treasury Department | 12,946 | $1.03M | 0.00% | +7,933+158.2% | Added |
| Mutual of America Capital Management LLC | 13,880 | $1.03M | 0.01% | −1,520−9.9% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 13,367 | $988.4K | 0.00% | +13,367 | New |
| LPL Financial LLC | 12,648 | $935.2K | 0.00% | +279+2.3% | Added |
| Yousif Capital Management, LLC | 11,055 | $927.7K | 0.01% | −162−1.4% | Reduced |
| Marnell Management LLC | 11,700 | $865.1K | 0.66% | +11,700 | New |
| Walnut Level Capital LLC | 11,404 | $843.2K | 0.67% | −46,275−80.2% | Reduced |
| Arizona State Retirement System | 10,794 | $798.1K | 0.00% | +10,794 | New |
| Public Employees Retirement System of Ohio | 10,056 | $743.5K | 0.00% | −382−3.7% | Reduced |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 9,980 | $740.0K | 0.00% | +3,628+57.1% | Added |
| Weiss Asset Management LP | 9,928 | $734.1K | 0.01% | +9,928 | New |
| JustInvest LLC | 9,755 | $721.3K | 0.01% | +411+4.4% | Added |
| Brevan Howard Capital Management LP | 9,468 | $700.1K | 0.01% | +2,062+27.8% | Added |
| Louisiana State Employees Retirement System | 9,200 | $680.2K | 0.01% | −100−1.1% | Reduced |
| Gotham Asset Management, LLC | 9,199 | $680.2K | 0.00% | −12,866−58.3% | Reduced |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 9,182 | $678.9K | 0.00% | −291−3.1% | Reduced |
| Alpine Woods Capital Investors, LLC | 8,989 | $664.6K | 0.16% | +8,989 | New |
| Handelsbanken Fonder AB | 8,900 | $658.0K | 0.00% | +400+4.7% | Added |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 8,346 | $617.1K | 0.00% | −212−2.5% | Reduced |
| KLP Kapitalforvaltning AS | 8,200 | $606.3K | 0.00% | +8,200 | New |
| Canada Pension Plan Investment Board | 7,931 | $586.4K | 0.00% | +2,721+52.2% | Added |
| State of Michigan Retirement System | 7,900 | $584.1K | 0.00% | 00.0% | Unchanged |
| DekaBank Deutsche Girozentrale | 3,540 | $583.0K | 0.00% | 00.0% | Unchanged |
| State of Wyoming | 7,824 | $578.5K | 0.06% | +7,824 | New |
| Creative Planning | 7,685 | $568.2K | 0.00% | −5,644−42.3% | Reduced |
| Thrivent Financial for Lutherans | 7,510 | $555.0K | 0.00% | −151−2.0% | Reduced |
| Northwestern Mutual Investment Management Company, LLC | 7,462 | $551.7K | 0.01% | +30+0.4% | Added |
| Oak Thistle LLC | 7,170 | $530.1K | 0.07% | +7,170 | New |
| Edgestream Partners, L.P. | 7,095 | $524.6K | 0.01% | +7,095 | New |
| BI Asset Management Fondsmaeglerselskab A/S | 7,037 | $520.0K | 0.00% | +3,338+90.2% | Added |
| New Mexico Educational Retirement Board | 7,000 | $518.0K | 0.02% | 00.0% | Unchanged |
| Pettee Investors, Inc. | 6,711 | $496.2K | 0.28% | 00.0% | Unchanged |
| Oregon Public Employees Retirement Fund | 6,668 | $493.0K | 0.01% | 00.0% | Unchanged |
| Polymer Capital Management (US) LLC | 6,500 | $480.6K | 0.06% | −9,700−59.9% | Reduced |
| RiverFront Investment Group, LLC | 6,497 | $480.4K | 0.01% | −475−6.8% | Reduced |
| Advisors Asset Management, Inc. | 6,047 | $447.1K | 0.01% | −1,574−20.7% | Reduced |
| Pictet Asset Management Holding SA | 6,025 | $445.5K | 0.00% | +6,025 | New |
| Schonfeld Strategic Advisors LLC | 6,012 | $444.5K | 0.00% | −39,978−86.9% | Reduced |
| Numerai GP LLC | 5,792 | $428.3K | 0.05% | +5,792 | New |
| Police & Firemen's Retirement System of New Jersey | 5,684 | $420.3K | 0.00% | 00.0% | Unchanged |
| Storgate, LLC | 5,380 | $397.8K | 0.33% | +5,380 | New |
| New York State Teachers Retirement System | 5,225 | $386.0K | 0.00% | 00.0% | Unchanged |
| Unison Advisors LLC | 5,215 | $385.6K | 0.03% | +35+0.7% | Added |
| Quest Partners LLC | 5,192 | $383.9K | 0.02% | +4,548+706.2% | Added |
| Pathstone Holdings, LLC | 4,649 | $343.7K | 0.00% | −4,355−48.4% | Reduced |
| Caxton Associates LLP | 4,615 | $341.2K | 0.01% | +4,615 | New |
| CWM Advisors, LLC | 4,404 | $325.6K | 0.03% | +412+10.3% | Added |
| Guggenheim Capital LLC | 4,174 | $308.6K | 0.00% | +4,174 | New |
| Ci Investments Inc. | 4,128 | $305.2K | 0.00% | −56−1.3% | Reduced |
| Daiwa Securities Group Inc. | 4,108 | $304.0K | 0.00% | +117+2.9% | Added |
| Atria Investments LLC | 4,072 | $301.1K | 0.00% | +239+6.2% | Added |
| Pacer Advisors, Inc. | 3,988 | $294.9K | 0.00% | −2,022−33.6% | Reduced |
| CIBC Asset Management Inc | 3,977 | $294.1K | 0.00% | −402−9.2% | Reduced |
| Gamco Investors, Inc. Et Al | 3,941 | $291.4K | 0.00% | −200−4.8% | Reduced |
| Mercer Global Advisors Inc | 3,923 | $290.1K | 0.00% | −318−7.5% | Reduced |
| Assenagon Asset Management S.A. | 3,790 | $280.2K | 0.00% | +3,790 | New |
| Dark Forest Capital Management LP | 3,750 | $277.3K | 0.01% | −53,742−93.5% | Reduced |
| AlphaGrep UK Ltd | 3,471 | $256.6K | 0.09% | +3,471 | New |
| Sanctuary Advisors, LLC | 3,441 | $254.4K | 0.00% | −108−3.0% | Reduced |
| State of Alaska, Department of Revenue | 3,309 | $244.0K | 0.00% | −340−9.3% | Reduced |
| Cetera Investment Advisers | 3,154 | $233.2K | 0.00% | −1,527−32.6% | Reduced |
| Raymond James Financial Inc | 3,121 | $230.8K | 0.00% | −1,635−34.4% | Reduced |
| Capstone Investment Advisors, LLC | 3,119 | $230.6K | 0.00% | +3,119 | New |
| Xponance, Inc. | 3,101 | $229.3K | 0.00% | −638−17.1% | Reduced |
| Claret Asset Management Corp | 3,007 | $222.0K | 0.03% | −7−0.2% | Reduced |
| Total Wealth Planning & Management, Inc. | 2,955 | $218.5K | 0.17% | +2,955 | New |
| Odyssean, LLC | 2,903 | $214.6K | 0.15% | +2,903 | New |
| ISAM Funds (UK) Ltd | 2,828 | $209.1K | 0.08% | +2,828 | New |
| Federation des caisses Desjardins du Quebec | 2,559 | $189.2K | 0.00% | +372+17.0% | Added |
| Lloyd Advisory Services, LLC. | 2,445 | $180.8K | 0.07% | +2,445 | New |
| Securian Asset Management, Inc | 2,403 | $177.7K | 0.01% | 00.0% | Unchanged |
| CoreFirst Bank & Trust | 2,220 | $164.1K | 0.09% | −30−1.3% | Reduced |
| Virtus Investment Advisers, Inc. | 2,186 | $161.6K | 0.04% | +2,186 | New |
| US Bancorp | 2,010 | $148.6K | 0.00% | −423−17.4% | Reduced |
| Simplex Trading, LLC | 1,981 | $146.5K | 0.00% | +1,981 | New |
| Sterling Capital Management LLC | 1,977 | $146.2K | 0.00% | −89−4.3% | Reduced |
| Manning & Napier Advisors LLC | 1,745 | $130.7K | 0.00% | −2,443−58.3% | Reduced |
| Public Employees Retirement Association of Colorado | 1,704 | $126.0K | 0.00% | 00.0% | Unchanged |
| Covestor Ltd | 1,662 | $123.0K | 0.06% | −117−6.6% | Reduced |
| Hantz Financial Services, Inc. | 1,553 | $115.0K | 0.00% | +813+109.9% | Added |
| Kimelman & Baird, LLC | 1,500 | $110.9K | 0.01% | 00.0% | Unchanged |
| Allworth Financial LP | 1,438 | $106.3K | 0.00% | −4−0.3% | Reduced |