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, Q3 2025
Institutional positions in Alector, Inc. as of Sep 30, 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
- 149
- +13 vs. Q2 2025
- Shares held
- 74.7M
- +4.24M (+6.0%) vs. Q2 2025
- Total value
- $221.2M
- +$122.5M (+124.1%) vs. Q2 2025
- New holders
- 25
- 46 more added
- Sold out
- 12
- 40 more reduced
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding Alector, Inc.; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Marshall Wace, LLP | 151,643 | $448.9K | 0.00% | +151,643 | New |
| Alphabet Inc. | 175,866 | $520.6K | 0.02% | 00.0% | Unchanged |
| Invesco Ltd. | 192,311 | $569.2K | 0.00% | +16,510+9.4% | Added |
| Manufacturers Life Insurance Company, The | 216,574 | $641.1K | 0.00% | −97,004−30.9% | Reduced |
| Bank of New York Mellon Corp | 224,484 | $664.5K | 0.00% | −44,388−16.5% | Reduced |
| UBS Group AG | 230,499 | $682.3K | 0.00% | +188,606+450.2% | Added |
| Bank of America Corp | 246,283 | $729.0K | 0.00% | −97,626−28.4% | Reduced |
| TD Asset Management Inc | 273,738 | $810.3K | 0.00% | −378,000−58.0% | Reduced |
| Ameriprise Financial Inc | 274,042 | $811.2K | 0.00% | +259,907+1,838.7% | Added |
| Mackenzie Financial Corp | 283,712 | $839.8K | 0.00% | +9,270+3.4% | Added |
| Dimensional Fund Advisors LP | 295,846 | $876.0K | 0.00% | −87,485−22.8% | Reduced |
| Two Sigma Investments, LP | 307,179 | $909.3K | 0.00% | +85,040+38.3% | Added |
| Susquehanna International Group, LLP | 308,660 | $913.6K | 0.00% | +104,862+51.5% | Added |
| New Leaf Venture Partners, L.L.C. | 339,569 | $1.01M | 2.33% | 00.0% | Unchanged |
| Jane Street Group, LLC | 350,231 | $1.04M | 0.00% | +326,279+1,362.2% | Added |
| Morgan Stanley | 434,168 | $1.29M | 0.00% | −172,384−28.4% | Reduced |
| AQR Capital Management LLC | 438,087 | $1.30M | 0.00% | +31,469+7.7% | Added |
| Citadel Advisors LLC | 471,581 | $1.40M | 0.00% | −80,239−14.5% | Reduced |
| Medici Capital LLC | 481,974 | $1.43M | 1.06% | +314,783+188.3% | Added |
| Two Sigma Advisers, LP | 517,400 | $1.53M | 0.00% | +140,400+37.2% | Added |
| Boothbay Fund Management, LLC | 524,077 | $1.55M | 0.04% | +65,214+14.2% | Added |
| Goldman Sachs Group Inc | 609,909 | $1.81M | 0.00% | +235,432+62.9% | Added |
| Royal Bank of Canada | 628,652 | $1.86M | 0.00% | +261,464+71.2% | Added |
| Northern Trust Corp | 633,709 | $1.88M | 0.00% | −24,452−3.7% | Reduced |
| Charles Schwab Investment Management Inc | 689,524 | $2.04M | 0.00% | +41,871+6.5% | Added |
| Panagora Asset Management Inc | 741,293 | $2.19M | 0.01% | +224,613+43.5% | Added |
| Ikarian Capital, LLC | 760,000 | $2.25M | 0.51% | −140,000−15.6% | Reduced |
| DAFNA Capital Management LLC | 798,351 | $2.36M | 0.58% | −114,577−12.6% | Reduced |
| Barclays PLC | 873,375 | $2.59M | 0.00% | +703,580+414.4% | Added |
| Renaissance Technologies LLC | 949,150 | $2.81M | 0.00% | −305,700−24.4% | Reduced |
| D. E. Shaw & Co., Inc. | 978,204 | $2.90M | 0.00% | +444,004+83.1% | Added |
| Vestal Point Capital, LP | 980,000 | $2.90M | 0.13% | +3,008+0.3% | Added |
| 5AM Venture Management, LLC | 995,841 | $2.95M | 1.08% | 00.0% | Unchanged |
| 683 Capital Management, LLC | 1,000,000 | $2.96M | 0.27% | +1,000,000 | New |
| Deerfield Management Company, L.P. (Series C) | 1,055,192 | $3.12M | 0.05% | 00.0% | Unchanged |
| Deutsche Bank AG | 1,068,215 | $3.16M | 0.00% | +78,468+7.9% | Added |
| Millennium Management LLC | 1,155,027 | $3.42M | 0.00% | +744,224+181.2% | Added |
| Jacobs Levy Equity Management, Inc | 1,230,974 | $3.64M | 0.01% | −91,908−6.9% | Reduced |
| Euclidean Capital LLC | 1,307,858 | $3.87M | 1.63% | 00.0% | Unchanged |
| Eversept Partners, LP | 1,488,725 | $4.41M | 0.34% | −497,347−25.0% | Reduced |
| State Street Corp | 1,734,679 | $5.13M | 0.00% | +24,777+1.4% | Added |
| Geode Capital Management, LLC | 1,861,258 | $5.51M | 0.00% | −120,810−6.1% | Reduced |
| Price T Rowe Associates Inc | 2,185,032 | $6.47M | 0.00% | −2,690,232−55.2% | Reduced |
| Acadian Asset Management LLC | 2,372,985 | $7.02M | 0.01% | +202,597+9.3% | Added |
| Merck & Co., Inc. | 3,545,719 | $10.5M | 4.60% | 00.0% | Unchanged |
| Vanguard Group Inc | 6,034,659 | $17.9M | 0.00% | +46,955+0.8% | Added |
| RTW Investments, LP | 6,990,806 | $20.7M | 0.25% | +6,990,806 | New |
| BlackRock, Inc. | 7,197,973 | $21.3M | 0.00% | −775,607−9.7% | Reduced |
| FMR LLC | 15,181,849 | $44.9M | 0.00% | +182,960+1.2% | Added |
| ADAR1 Capital Management, LLC | 0 | $0 | 0.00% | −1,723,526−100.0% | Sold out |
| Sio Capital Management, LLC | 0 | $0 | 0.00% | −845,531−100.0% | Sold out |
| Walleye Capital LLC | 0 | $0 | 0.00% | −266,204−100.0% | Sold out |
| State of Wyoming | 0 | $0 | 0.00% | −223,092−100.0% | Sold out |
| Gsa Capital Partners LLP | 0 | $0 | 0.00% | −150,669−100.0% | Sold out |
| Susquehanna Fundamental Investments, LLC | 0 | $0 | 0.00% | −70,778−100.0% | Sold out |
| Algert Global LLC | 0 | $0 | 0.00% | −44,460−100.0% | Sold out |
| State Board of Administration of Florida Retirement System | 0 | $0 | 0.00% | −25,570−100.0% | Sold out |
| Shell Asset Management Co | 0 | $0 | 0.00% | −13,887−100.0% | Sold out |
| US Bancorp | 0 | $0 | 0.00% | −12,427−100.0% | Sold out |
| Raymond James Financial Inc | 0 | $0 | 0.00% | −1,479−100.0% | Sold out |
| Skopos Labs, Inc. | 0 | $0 | 0.00% | −601−100.0% | Sold out |