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 |
|---|---|---|---|---|---|
| FMR LLC | 15,181,849 | $44.9M | 0.00% | +182,960+1.2% | Added |
| BlackRock, Inc. | 7,197,973 | $21.3M | 0.00% | −775,607−9.7% | Reduced |
| RTW Investments, LP | 6,990,806 | $20.7M | 0.25% | +6,990,806 | New |
| Vanguard Group Inc | 6,034,659 | $17.9M | 0.00% | +46,955+0.8% | Added |
| Merck & Co., Inc. | 3,545,719 | $10.5M | 4.60% | 00.0% | Unchanged |
| Acadian Asset Management LLC | 2,372,985 | $7.02M | 0.01% | +202,597+9.3% | Added |
| Price T Rowe Associates Inc | 2,185,032 | $6.47M | 0.00% | −2,690,232−55.2% | Reduced |
| Geode Capital Management, LLC | 1,861,258 | $5.51M | 0.00% | −120,810−6.1% | Reduced |
| State Street Corp | 1,734,679 | $5.13M | 0.00% | +24,777+1.4% | Added |
| Eversept Partners, LP | 1,488,725 | $4.41M | 0.34% | −497,347−25.0% | Reduced |
| Euclidean Capital LLC | 1,307,858 | $3.87M | 1.63% | 00.0% | Unchanged |
| Jacobs Levy Equity Management, Inc | 1,230,974 | $3.64M | 0.01% | −91,908−6.9% | Reduced |
| Millennium Management LLC | 1,155,027 | $3.42M | 0.00% | +744,224+181.2% | Added |
| Deutsche Bank AG | 1,068,215 | $3.16M | 0.00% | +78,468+7.9% | Added |
| Deerfield Management Company, L.P. (Series C) | 1,055,192 | $3.12M | 0.05% | 00.0% | Unchanged |
| 683 Capital Management, LLC | 1,000,000 | $2.96M | 0.27% | +1,000,000 | New |
| 5AM Venture Management, LLC | 995,841 | $2.95M | 1.08% | 00.0% | Unchanged |
| Vestal Point Capital, LP | 980,000 | $2.90M | 0.13% | +3,008+0.3% | Added |
| D. E. Shaw & Co., Inc. | 978,204 | $2.90M | 0.00% | +444,004+83.1% | Added |
| Renaissance Technologies LLC | 949,150 | $2.81M | 0.00% | −305,700−24.4% | Reduced |
| Barclays PLC | 873,375 | $2.59M | 0.00% | +703,580+414.4% | Added |
| DAFNA Capital Management LLC | 798,351 | $2.36M | 0.58% | −114,577−12.6% | Reduced |
| Ikarian Capital, LLC | 760,000 | $2.25M | 0.51% | −140,000−15.6% | Reduced |
| Panagora Asset Management Inc | 741,293 | $2.19M | 0.01% | +224,613+43.5% | Added |
| Charles Schwab Investment Management Inc | 689,524 | $2.04M | 0.00% | +41,871+6.5% | Added |
| Northern Trust Corp | 633,709 | $1.88M | 0.00% | −24,452−3.7% | Reduced |
| Royal Bank of Canada | 628,652 | $1.86M | 0.00% | +261,464+71.2% | Added |
| Goldman Sachs Group Inc | 609,909 | $1.81M | 0.00% | +235,432+62.9% | Added |
| Boothbay Fund Management, LLC | 524,077 | $1.55M | 0.04% | +65,214+14.2% | Added |
| Two Sigma Advisers, LP | 517,400 | $1.53M | 0.00% | +140,400+37.2% | Added |
| Medici Capital LLC | 481,974 | $1.43M | 1.06% | +314,783+188.3% | Added |
| Citadel Advisors LLC | 471,581 | $1.40M | 0.00% | −80,239−14.5% | Reduced |
| AQR Capital Management LLC | 438,087 | $1.30M | 0.00% | +31,469+7.7% | Added |
| Morgan Stanley | 434,168 | $1.29M | 0.00% | −172,384−28.4% | Reduced |
| Jane Street Group, LLC | 350,231 | $1.04M | 0.00% | +326,279+1,362.2% | Added |
| New Leaf Venture Partners, L.L.C. | 339,569 | $1.01M | 2.33% | 00.0% | Unchanged |
| Susquehanna International Group, LLP | 308,660 | $913.6K | 0.00% | +104,862+51.5% | Added |
| Two Sigma Investments, LP | 307,179 | $909.3K | 0.00% | +85,040+38.3% | Added |
| Dimensional Fund Advisors LP | 295,846 | $876.0K | 0.00% | −87,485−22.8% | Reduced |
| Mackenzie Financial Corp | 283,712 | $839.8K | 0.00% | +9,270+3.4% | Added |
| Ameriprise Financial Inc | 274,042 | $811.2K | 0.00% | +259,907+1,838.7% | Added |
| TD Asset Management Inc | 273,738 | $810.3K | 0.00% | −378,000−58.0% | Reduced |
| Bank of America Corp | 246,283 | $729.0K | 0.00% | −97,626−28.4% | Reduced |
| UBS Group AG | 230,499 | $682.3K | 0.00% | +188,606+450.2% | Added |
| Bank of New York Mellon Corp | 224,484 | $664.5K | 0.00% | −44,388−16.5% | Reduced |
| Manufacturers Life Insurance Company, The | 216,574 | $641.1K | 0.00% | −97,004−30.9% | Reduced |
| Invesco Ltd. | 192,311 | $569.2K | 0.00% | +16,510+9.4% | Added |
| Alphabet Inc. | 175,866 | $520.6K | 0.02% | 00.0% | Unchanged |
| Marshall Wace, LLP | 151,643 | $448.9K | 0.00% | +151,643 | New |
| JPMorgan Chase & Co | 136,385 | $403.7K | 0.00% | +90,894+199.8% | Added |
| Diadema Partners LP | 136,023 | $402.6K | 0.28% | −130,000−48.9% | Reduced |
| Nuveen, LLC | 133,248 | $394.4K | 0.00% | −22,365−14.4% | Reduced |
| Bridgeway Capital Management, LLC | 115,000 | $340.4K | 0.01% | 00.0% | Unchanged |
| Rhumbline Advisers | 114,270 | $338.2K | 0.00% | −12,298−9.7% | Reduced |
| STRS Ohio | 110,400 | $326.8K | 0.00% | 00.0% | Unchanged |
| Russell Investments Group, Ltd. | 104,824 | $310.3K | 0.00% | +4,458+4.4% | Added |
| DekaBank Deutsche Girozentrale | 100,000 | $303.0K | 0.00% | 00.0% | Unchanged |
| Simplex Trading, LLC | 100,944 | $298.0K | 0.01% | +100,944 | New |
| Cubist Systematic Strategies, LLC | 100,067 | $296.2K | 0.00% | +78,248+358.6% | Added |
| XTX Topco Ltd | 98,513 | $291.6K | 0.02% | +25,175+34.3% | Added |
| Alliancebernstein L.P. | 92,940 | $275.1K | 0.00% | 00.0% | Unchanged |
| Los Angeles Capital Management LLC | 91,236 | $270.1K | 0.00% | −60,660−39.9% | Reduced |
| Utah Retirement Systems | 72,002 | $213.1K | 0.00% | +20,572+40.0% | Added |
| Jasper Ridge Partners, L.P. | 71,776 | $212.5K | 0.00% | +41,144+134.3% | Added |
| Artia Global Partners LP | 71,029 | $210.2K | 0.04% | +71,029 | New |
| Public Employees Retirement System of Ohio | 68,200 | $201.9K | 0.00% | +60,300+763.3% | Added |
| HRT Financial LP | 60,164 | $178.0K | 0.00% | +60,164 | New |
| Spears Abacus Advisors LLC | 59,223 | $175.3K | 0.00% | −2,290−3.7% | Reduced |
| JustInvest LLC | 58,320 | $172.6K | 0.00% | +6,225+11.9% | Added |
| Velan Capital Investment Management LP | 55,000 | $162.8K | 0.15% | 00.0% | Unchanged |
| Citigroup Inc | 53,938 | $159.7K | 0.00% | +4,477+9.1% | Added |
| Ieq Capital, LLC | 53,050 | $157.0K | 0.00% | −5,948−10.1% | Reduced |
| Wells Fargo & Company | 52,425 | $155.2K | 0.00% | +1,824+3.6% | Added |
| Bank of Montreal | 52,380 | $155.0K | 0.00% | 00.0% | Unchanged |
| HSBC Holdings PLC | 48,666 | $139.7K | 0.00% | −3,034−5.9% | Reduced |
| Tudor Investment Corp Et Al | 41,282 | $122.2K | 0.00% | +487+1.2% | Added |
| Intech Investment Management LLC | 33,428 | $98.9K | 0.00% | −6,487−16.3% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 32,129 | $95.1K | 0.00% | −14,157−30.6% | Reduced |
| Persistent Asset Partners Ltd | 31,240 | $92.5K | 0.07% | −29,856−48.9% | Reduced |
| MetLife Investment Management | 28,820 | $85.3K | 0.00% | +28,820 | New |
| Prudential Financial Inc | 28,022 | $82.9K | 0.00% | +6,700+31.4% | Added |
| Cerity Partners LLC | 26,807 | $79.3K | 0.00% | +3,071+12.9% | Added |
| Vontobel Holding Ltd. | 26,000 | $77.0K | 0.00% | −12,000−31.6% | Reduced |
| Blackstone Group Inc. | 25,715 | $76.1K | 0.00% | 00.0% | Unchanged |
| CWM, LLC | 25,169 | $75.0K | 0.00% | −728−2.8% | Reduced |
| Apollon Wealth Management, LLC | 25,000 | $74.0K | 0.00% | 00.0% | Unchanged |
| Police & Firemen's Retirement System of New Jersey | 23,426 | $69.3K | 0.00% | +6,422+37.8% | Added |
| Group One Trading, L.P. | 22,321 | $66.1K | 0.00% | +22,321 | New |
| Graham Capital Management, L.P. | 21,215 | $62.8K | 0.00% | −158−0.7% | Reduced |
| American Century Companies Inc | 20,481 | $60.6K | 0.00% | +20,481 | New |
| Erste Asset Management GmbH | 19,000 | $58.0K | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 18,269 | $54.1K | 0.00% | +6,635+57.0% | Added |
| China Universal Asset Management Co., Ltd. | 17,741 | $52.5K | 0.00% | −2,342−11.7% | Reduced |
| SEI Investments Co | 16,884 | $50.0K | 0.00% | 00.0% | Unchanged |
| Creative Planning | 15,721 | $46.5K | 0.00% | +15,721 | New |
| DLK Investment Management, LLC | 15,500 | $45.9K | 0.02% | 00.0% | Unchanged |
| ProShare Advisors LLC | 15,431 | $45.7K | 0.00% | −4,647−23.1% | Reduced |
| FNY Investment Advisers, LLC | 15,000 | $44.0K | 0.01% | −5,000−25.0% | Reduced |
| Engineers Gate Manager LP | 14,493 | $42.9K | 0.00% | +14,493 | New |
| Hamilton Lane Advisors LLC | 14,402 | $42.6K | 0.02% | +14,402 | New |