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, Q1 2026
Institutional positions in Alector, Inc. 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
- 138
- +9 vs. Q4 2025
- Shares held
- 88.4M
- +10.9M (+14.0%) vs. Q4 2025
- Total value
- $190.0M
- +$69.2M (+57.3%) vs. Q4 2025
- New holders
- 29
- 44 more added
- Sold out
- 20
- 36 more reduced
2 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 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, Q1 2026
Shares, value and share of portfolio for each institution holding Alector, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| XTX Topco Ltd | 559,896 | $1.20M | 0.02% | −32,943−5.6% | Reduced |
| Vanguard Fiduciary Trust Co | 577,939 | $1.24M | 0.00% | +577,939 | New |
| Panagora Asset Management Inc | 590,388 | $1.27M | 0.00% | −259,910−30.6% | Reduced |
| Goldman Sachs Group Inc | 604,562 | $1.30M | 0.00% | +166,603+38.0% | Added |
| Marshall Wace, LLP | 620,424 | $1.33M | 0.00% | −546,393−46.8% | Reduced |
| Northern Trust Corp | 692,256 | $1.49M | 0.00% | +104,603+17.8% | Added |
| AQR Capital Management LLC | 711,334 | $1.53M | 0.00% | +111,765+18.6% | Added |
| Charles Schwab Investment Management Inc | 787,408 | $1.69M | 0.00% | +121,917+18.3% | Added |
| Mackenzie Financial Corp | 857,354 | $1.84M | 0.00% | +197,186+29.9% | Added |
| Elmind Capital, LP | 900,000 | $1.94M | 0.55% | 00.0% | Unchanged |
| DAFNA Capital Management LLC | 908,351 | $1.95M | 0.44% | 00.0% | Unchanged |
| ADAR1 Capital Management, LLC | 1,050,000 | $2.26M | 0.14% | −58,000−5.2% | Reduced |
| Deerfield Management Company, L.P. (Series C) | 1,055,192 | $2.27M | 0.03% | 00.0% | Unchanged |
| Deutsche Bank AG | 1,092,903 | $2.35M | 0.00% | +57,749+5.6% | Added |
| Two Sigma Investments, LP | 1,279,306 | $2.75M | 0.00% | +239,650+23.1% | Added |
| Renaissance Technologies LLC | 1,287,691 | $2.77M | 0.00% | −255,959−16.6% | Reduced |
| Euclidean Capital LLC | 1,307,858 | $2.81M | 0.72% | 00.0% | Unchanged |
| Eversept Partners, LP | 1,351,106 | $2.90M | 0.19% | +344,943+34.3% | Added |
| Medici Capital LLC | 1,652,520 | $3.55M | 4.97% | +152,000+10.1% | Added |
| FMR LLC | 1,796,104 | $3.86M | 0.00% | −435,067−19.5% | Reduced |
| State Street Corp | 1,865,526 | $4.01M | 0.00% | +51,228+2.8% | Added |
| Millennium Management LLC | 1,979,226 | $4.26M | 0.00% | +646,312+48.5% | Added |
| Kynam Capital Management, LP | 2,000,000 | $4.30M | 0.27% | 00.0% | Unchanged |
| Ikarian Capital, LLC | 2,082,606 | $4.48M | 0.64% | 00.0% | Unchanged |
| Spruce Street Capital LP | 2,101,068 | $4.52M | 1.09% | +983,082+87.9% | Added |
| Jacobs Levy Equity Management, Inc | 2,154,361 | $4.63M | 0.02% | −18,841−0.9% | Reduced |
| Geode Capital Management, LLC | 2,286,218 | $4.92M | 0.00% | +210,998+10.2% | Added |
| Vanguard Portfolio Management LLC | 2,583,542 | $5.55M | 0.00% | +2,583,542 | New |
| Nantahala Capital Management, LLC | 2,815,983 | $6.05M | 0.38% | +2,815,983 | New |
| Balyasny Asset Management LLC | 2,935,253 | $6.31M | 0.01% | −330,322−10.1% | Reduced |
| 683 Capital Management, LLC | 3,200,000 | $6.88M | 0.64% | −150,000−4.5% | Reduced |
| D. E. Shaw & Co., Inc. | 3,332,835 | $7.17M | 0.01% | +967,684+40.9% | Added |
| Merck & Co., Inc. | 3,545,719 | $7.62M | 2.18% | 00.0% | Unchanged |
| Vanguard Capital Management LLC | 3,678,722 | $7.91M | 0.00% | +3,678,722 | New |
| Foresite Capital Management IV, LLC | 3,887,200 | $8.36M | 3.53% | 00.0% | Unchanged |
| Acadian Asset Management LLC | 4,038,785 | $8.68M | 0.01% | +596,336+17.3% | Added |
| BlackRock, Inc. | 7,741,245 | $16.6M | 0.00% | +593,479+8.3% | Added |
| TCG Crossover Management, LLC | 10,000,000 | $21.5M | 0.62% | 00.0% | Unchanged |
| Vestal Point Capital, LP | 0 | $0 | 0.00% | −755,000−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −651,800−100.0% | Sold out |
| Graham Capital Management, L.P. | 0 | $0 | 0.00% | −104,851−100.0% | Sold out |
| Los Angeles Capital Management LLC | 0 | $0 | 0.00% | −93,052−100.0% | Sold out |
| Man Group plc | 0 | $0 | 0.00% | −86,162−100.0% | Sold out |
| Squarepoint Ops LLC | 0 | $0 | 0.00% | −77,618−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −57,341−100.0% | Sold out |
| Lexington Partners L.P. | 0 | $0 | 0.00% | −53,488−100.0% | Sold out |
| Oxford Asset Management LLP | 0 | $0 | 0.00% | −42,905−100.0% | Sold out |
| Tudor Investment Corp Et Al | 0 | $0 | 0.00% | −41,282−100.0% | Sold out |
| SG Americas Securities, LLC | 0 | $0 | 0.00% | −27,002−100.0% | Sold out |
| Dynamic Technology Lab Private Ltd | 0 | $0 | 0.00% | −25,881−100.0% | Sold out |
| Virtu Financial LLC | 0 | $0 | 0.00% | −21,886−100.0% | Sold out |
| Hershey Trust Co | 0 | $0 | 0.00% | −20,572−100.0% | Sold out |
| R Squared Ltd | 0 | $0 | 0.00% | −12,474−100.0% | Sold out |
| CI Private Wealth, LLC | 0 | $0 | 0.00% | −10,288−100.0% | Sold out |
| Texas Yale Capital Corp. | 0 | $0 | 0.00% | −10,000−100.0% | Sold out |
| Amalgamated Bank | 0 | $0 | 0.00% | −2,523−100.0% | Sold out |
| Advisor Group Holdings, Inc. | 0 | $0 | 0.00% | −620−100.0% | Sold out |
| DekaBank Deutsche Girozentrale | 0 | $0 | 0.00% | −100,000−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |
| Comerica Bank | – | – | – | – | Not filed |