Alector, Inc.
ALEC- Exchange
- Nasdaq
- Industry
- Biological Products, (No Diagnostic Substances)
- SEC CIK
- 0001653087
In the last 90 days, Alector, Inc. insiders filed 0 open-market purchases and 3 sales; 140 institutions reported holding it in 13F filings for Q2 2026, worth $183.4M in total; no superinvestor holds it.
13F holders, Q4 2025
Institutional positions in Alector, Inc. 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
- 131
- −14 vs. Q3 2025
- Shares held
- 84.4M
- +10.2M (+13.7%) vs. Q3 2025
- Total value
- $131.5M
- −$88.3M (−40.2%) vs. Q3 2025
- New holders
- 25
- 40 more added
- Sold out
- 39
- 41 more reduced
4 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 ALEC 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 | 140 | $183.4M |
| Q1 2026 | 138 | $190.0M |
| Q4 2025 | 131 | $131.5M |
| Q3 2025 | 149 | $221.2M |
| Q2 2025 | 136 | $98.7M |
| Q1 2025 | 141 | $89.1M |
| Q4 2024 | 150 | $138.8M |
| Q3 2024 | 159 | $338.4M |
| Q2 2024 | 160 | $330.4M |
| Q1 2024 | 157 | $446.6M |
| Q4 2023 | 148 | $510.1M |
| Q3 2023 | 149 | $402.6M |
| Q2 2023 | 145 | $354.5M |
| Q1 2023 | 149 | $360.9M |
| Q4 2022 | 155 | $506.0M |
| Q3 2022 | 168 | $516.1M |
| Q2 2022 | 154 | $546.8M |
| Q1 2022 | 166 | $789.8M |
| Q4 2021 | 167 | $1.13B |
| Q3 2021 | 145 | $1.19B |
| Q2 2021 | 138 | $1.02B |
| Q1 2021 | 127 | $931.7M |
Institutions, Q4 2025
Shares, value and share of portfolio for each institution holding Alector, Inc.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Panagora Asset Management Inc | 850,298 | $1.33M | 0.00% | +109,005+14.7% | Added |
| Elmind Capital, LP | 900,000 | $1.40M | 0.41% | +900,000 | New |
| DAFNA Capital Management LLC | 908,351 | $1.42M | 0.33% | +110,000+13.8% | Added |
| Jane Street Group, LLC | 993,913 | $1.55M | 0.00% | +643,682+183.8% | Added |
| Eversept Partners, LP | 1,006,163 | $1.57M | 0.09% | −482,562−32.4% | Reduced |
| Deutsche Bank AG | 1,035,154 | $1.61M | 0.00% | −33,061−3.1% | Reduced |
| Two Sigma Investments, LP | 1,039,656 | $1.62M | 0.00% | +732,477+238.5% | Added |
| Deerfield Management Company, L.P. (Series C) | 1,055,192 | $1.65M | 0.02% | 00.0% | Unchanged |
| ADAR1 Capital Management, LLC | 1,108,000 | $1.73M | 0.13% | +1,108,000 | New |
| Spruce Street Capital LP | 1,117,986 | $1.74M | 0.58% | +1,117,986 | New |
| Marshall Wace, LLP | 1,166,817 | $1.82M | 0.00% | +1,015,174+669.4% | Added |
| Euclidean Capital LLC | 1,307,858 | $2.04M | 0.55% | 00.0% | Unchanged |
| Millennium Management LLC | 1,332,914 | $2.08M | 0.00% | +177,887+15.4% | Added |
| Medici Capital LLC | 1,500,520 | $2.34M | 2.57% | +1,018,546+211.3% | Added |
| Renaissance Technologies LLC | 1,543,650 | $2.41M | 0.00% | +594,500+62.6% | Added |
| State Street Corp | 1,814,298 | $2.83M | 0.00% | +79,619+4.6% | Added |
| Kynam Capital Management, LP | 2,000,000 | $3.12M | 0.20% | +2,000,000 | New |
| Geode Capital Management, LLC | 2,075,220 | $3.24M | 0.00% | +213,962+11.5% | Added |
| Ikarian Capital, LLC | 2,082,606 | $3.25M | 0.42% | +1,322,606+174.0% | Added |
| Jacobs Levy Equity Management, Inc | 2,173,202 | $3.39M | 0.01% | +942,228+76.5% | Added |
| FMR LLC | 2,231,171 | $3.48M | 0.00% | −12,950,678−85.3% | Reduced |
| D. E. Shaw & Co., Inc. | 2,365,151 | $3.69M | 0.00% | +1,386,947+141.8% | Added |
| Balyasny Asset Management LLC | 3,265,575 | $5.09M | 0.01% | +3,265,575 | New |
| 683 Capital Management, LLC | 3,350,000 | $5.23M | 0.43% | +2,350,000+235.0% | Added |
| Acadian Asset Management LLC | 3,442,449 | $5.36M | 0.01% | +1,069,464+45.1% | Added |
| Merck & Co., Inc. | 3,545,719 | $5.53M | 2.00% | 00.0% | Unchanged |
| Foresite Capital Management IV, LLC | 3,887,200 | $6.06M | 2.64% | +3,887,200 | New |
| Vanguard Group Inc | 6,908,054 | $10.8M | 0.00% | +873,395+14.5% | Added |
| BlackRock, Inc. | 7,147,766 | $11.2M | 0.00% | −50,207−0.7% | Reduced |
| TCG Crossover Management, LLC | 10,000,000 | $15.6M | 0.52% | +10,000,000 | New |
| DekaBank Deutsche Girozentrale | 100,000 | – | – | 00.0% | Unchanged |
| RTW Investments, LP | 0 | $0 | 0.00% | −6,990,806−100.0% | Sold out |
| 5AM Venture Management, LLC | 0 | $0 | 0.00% | −995,841−100.0% | Sold out |
| TD Asset Management Inc | 0 | $0 | 0.00% | −273,738−100.0% | Sold out |
| Alphabet Inc. | 0 | $0 | 0.00% | −175,866−100.0% | Sold out |
| Diadema Partners LP | 0 | $0 | 0.00% | −136,023−100.0% | Sold out |
| Artia Global Partners LP | 0 | $0 | 0.00% | −71,029−100.0% | Sold out |
| Velan Capital Investment Management LP | 0 | $0 | 0.00% | −55,000−100.0% | Sold out |
| Ieq Capital, LLC | 0 | $0 | 0.00% | −53,050−100.0% | Sold out |
| Bank of Montreal | 0 | $0 | 0.00% | −52,380−100.0% | Sold out |
| Persistent Asset Partners Ltd | 0 | $0 | 0.00% | −31,240−100.0% | Sold out |
| MetLife Investment Management | 0 | $0 | 0.00% | −28,820−100.0% | Sold out |
| Apollon Wealth Management, LLC | 0 | $0 | 0.00% | −25,000−100.0% | Sold out |
| Group One Trading, L.P. | 0 | $0 | 0.00% | −22,321−100.0% | Sold out |
| American Century Companies Inc | 0 | $0 | 0.00% | −20,481−100.0% | Sold out |
| Erste Asset Management GmbH | 0 | $0 | 0.00% | −19,000−100.0% | Sold out |
| China Universal Asset Management Co., Ltd. | 0 | $0 | 0.00% | −17,741−100.0% | Sold out |
| Creative Planning | 0 | $0 | 0.00% | −15,721−100.0% | Sold out |
| DLK Investment Management, LLC | 0 | $0 | 0.00% | −15,500−100.0% | Sold out |
| FNY Investment Advisers, LLC | 0 | $0 | 0.00% | −15,000−100.0% | Sold out |
| Engineers Gate Manager LP | 0 | $0 | 0.00% | −14,493−100.0% | Sold out |
| Hamilton Lane Advisors LLC | 0 | $0 | 0.00% | −14,402−100.0% | Sold out |
| Wealth Enhancement Advisory Services, LLC | 0 | $0 | 0.00% | −11,970−100.0% | Sold out |
| Belvedere Trading LLC | 0 | $0 | 0.00% | −10,486−100.0% | Sold out |
| SVB Capital Management, LLC | 0 | $0 | 0.00% | −10,286−100.0% | Sold out |
| Mirae Asset Global Investments Co., Ltd. | 0 | $0 | 0.00% | −3,913−100.0% | Sold out |
| SRS Capital Advisors, Inc. | 0 | $0 | 0.00% | −3,190−100.0% | Sold out |
| GF Fund Management Co. Ltd. | 0 | $0 | 0.00% | −2,178−100.0% | Sold out |
| Optiver Holding B.V. | 0 | $0 | 0.00% | −1,018−100.0% | Sold out |
| Clearstead Advisors, LLC | 0 | $0 | 0.00% | −453−100.0% | Sold out |
| Fortitude Family Office, LLC | 0 | $0 | 0.00% | −439−100.0% | Sold out |
| Rise Advisors, LLC | 0 | $0 | 0.00% | −407−100.0% | Sold out |
| Rialto Wealth Management, LLC | 0 | $0 | 0.00% | −403−100.0% | Sold out |
| The PNC Financial Services Group, Inc. | 0 | $0 | 0.00% | −370−100.0% | Sold out |
| Daiwa Securities Group Inc. | 0 | $0 | 0.00% | −277−100.0% | Sold out |
| Advisory Services Network, LLC | 0 | $0 | 0.00% | −271−100.0% | Sold out |
| Allworth Financial LP | 0 | $0 | 0.00% | −84−100.0% | Sold out |
| GWM Advisors LLC | 0 | $0 | 0.00% | −32−100.0% | Sold out |
| Truvestments Capital LLC | 0 | $0 | 0.00% | −2−100.0% | Sold out |
| Avion Wealth | 0 | $0 | 0.00% | −336−100.0% | Sold out |
| New Leaf Venture Partners, L.L.C. | – | – | – | – | Not filed |
| Cubist Systematic Strategies, LLC | – | – | – | – | Not filed |
| Point72 (DIFC) Ltd | – | – | – | – | Not filed |
| Point72 Asia (Singapore) Pte. Ltd. | – | – | – | – | Not filed |