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, Q2 2026
Institutional positions in Alector, Inc. as of Jun 30, 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
- 140
- +4 vs. Q1 2026
- Shares held
- 91.2M
- +2.87M (+3.2%) vs. Q1 2026
- Total value
- $183.4M
- −$6.54M (−3.4%) vs. Q1 2026
- New holders
- 13
- 59 more added
- Sold out
- 9
- 35 more reduced
2 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: 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, Q2 2026
Shares, value and share of portfolio for each institution holding Alector, Inc.; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Citadel Advisors LLC | 391,232 | $786.4K | 0.00% | +313,687+404.5% | Added |
| XTX Topco Ltd | 399,681 | $803.4K | 0.01% | −160,215−28.6% | Reduced |
| Goldman Sachs Group Inc | 433,875 | $872.1K | 0.00% | −170,687−28.2% | Reduced |
| Boothbay Fund Management, LLC | 532,850 | $1.07M | 0.02% | −26,876−4.8% | Reduced |
| Marshall Wace, LLP | 598,559 | $1.20M | 0.00% | −21,865−3.5% | Reduced |
| Vanguard Fiduciary Trust Co | 663,592 | $1.33M | 0.00% | +85,653+14.8% | Added |
| Northern Trust Corp | 773,462 | $1.55M | 0.00% | +81,206+11.7% | Added |
| Charles Schwab Investment Management Inc | 818,831 | $1.65M | 0.00% | +31,423+4.0% | Added |
| Panagora Asset Management Inc | 845,999 | $1.70M | 0.01% | +255,611+43.3% | Added |
| Elmind Capital, LP | 900,000 | $1.81M | 0.45% | 00.0% | Unchanged |
| DAFNA Capital Management LLC | 908,351 | $1.83M | 0.35% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 935,166 | $1.88M | 0.00% | −352,525−27.4% | Reduced |
| Two Sigma Investments, LP | 1,045,376 | $2.10M | 0.00% | −233,930−18.3% | Reduced |
| Deerfield Management Company, L.P. (Series C) | 1,055,192 | $2.12M | 0.02% | 00.0% | Unchanged |
| Deutsche Bank AG | 1,098,388 | $2.21M | 0.00% | +5,485+0.5% | Added |
| Mackenzie Financial Corp | 1,109,770 | $2.23M | 0.00% | +252,416+29.4% | Added |
| Euclidean Capital LLC | 1,307,858 | $2.63M | 0.60% | 00.0% | Unchanged |
| AQR Capital Management LLC | 1,309,577 | $2.63M | 0.00% | +598,243+84.1% | Added |
| FMR LLC | 1,396,398 | $2.81M | 0.00% | −399,706−22.3% | Reduced |
| Eversept Partners, LP | 1,423,873 | $2.86M | 0.16% | +72,767+5.4% | Added |
| Affinity Asset Advisors, LLC | 1,510,000 | $3.04M | 0.15% | +1,010,000+202.0% | Added |
| Medici Capital LLC | 1,652,520 | $3.32M | 6.51% | 00.0% | Unchanged |
| Jacobs Levy Equity Management, Inc | 1,765,929 | $3.55M | 0.01% | −388,432−18.0% | Reduced |
| State Street Corp | 1,879,765 | $3.78M | 0.00% | +14,239+0.8% | Added |
| Ikarian Capital, LLC | 1,982,606 | $3.99M | 0.65% | −100,000−4.8% | Reduced |
| Millennium Management LLC | 1,988,835 | $4.00M | 0.00% | +9,609+0.5% | Added |
| Spruce Street Capital LP | 2,101,068 | $4.22M | 0.83% | 00.0% | Unchanged |
| Geode Capital Management, LLC | 2,454,271 | $4.93M | 0.00% | +168,053+7.4% | Added |
| Vanguard Portfolio Management LLC | 2,820,493 | $5.67M | 0.00% | +236,951+9.2% | Added |
| ADAR1 Capital Management, LLC | 2,883,583 | $5.80M | 0.27% | +1,833,583+174.6% | Added |
| D. E. Shaw & Co., Inc. | 2,959,983 | $5.95M | 0.00% | −372,852−11.2% | Reduced |
| 683 Capital Management, LLC | 3,200,000 | $6.43M | 0.59% | 00.0% | Unchanged |
| Balyasny Asset Management LLC | 3,247,426 | $6.53M | 0.01% | +312,173+10.6% | Added |
| Merck & Co., Inc. | 3,545,719 | $7.13M | 1.35% | 00.0% | Unchanged |
| Kynam Capital Management, LP | 3,808,494 | $7.66M | 0.42% | +1,808,494+90.4% | Added |
| Vanguard Capital Management LLC | 4,009,340 | $8.06M | 0.00% | +330,618+9.0% | Added |
| Nantahala Capital Management, LLC | 4,318,109 | $8.68M | 0.52% | +1,502,126+53.3% | Added |
| Acadian Asset Management LLC | 4,414,345 | $8.86M | 0.01% | +375,560+9.3% | Added |
| BlackRock, Inc. | 7,847,879 | $15.8M | 0.00% | +106,634+1.4% | Added |
| TCG Crossover Management, LLC | 10,000,000 | $20.1M | 0.48% | 00.0% | Unchanged |
| Foresite Capital Management IV, LLC | 0 | $0 | 0.00% | −3,887,200−100.0% | Sold out |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −399,464−100.0% | Sold out |
| Odyssean, LLC | 0 | $0 | 0.00% | −89,783−100.0% | Sold out |
| Gsa Capital Partners LLP | 0 | $0 | 0.00% | −78,207−100.0% | Sold out |
| State of Wyoming | 0 | $0 | 0.00% | −1,645−100.0% | Sold out |
| Root Financial Partners, LLC | 0 | $0 | 0.00% | −305−100.0% | Sold out |
| Advisory Services Network, LLC | 0 | $0 | 0.00% | −271−100.0% | Sold out |
| MAI Capital Management | 0 | $0 | 0.00% | −67−100.0% | Sold out |
| Lloyd Advisory Services, LLC. | 0 | $0 | 0.00% | −48−100.0% | Sold out |
| CWM, LLC | – | – | – | – | Not filed |
| Sunbelt Securities, Inc. | – | – | – | – | Not filed |