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 |
|---|---|---|---|---|---|
| TCG Crossover Management, LLC | 10,000,000 | $21.5M | 0.62% | 00.0% | Unchanged |
| BlackRock, Inc. | 7,741,245 | $16.6M | 0.00% | +593,479+8.3% | Added |
| Acadian Asset Management LLC | 4,038,785 | $8.68M | 0.01% | +596,336+17.3% | Added |
| Foresite Capital Management IV, LLC | 3,887,200 | $8.36M | 3.53% | 00.0% | Unchanged |
| Vanguard Capital Management LLC | 3,678,722 | $7.91M | 0.00% | +3,678,722 | New |
| Merck & Co., Inc. | 3,545,719 | $7.62M | 2.18% | 00.0% | Unchanged |
| D. E. Shaw & Co., Inc. | 3,332,835 | $7.17M | 0.01% | +967,684+40.9% | Added |
| 683 Capital Management, LLC | 3,200,000 | $6.88M | 0.64% | −150,000−4.5% | Reduced |
| Balyasny Asset Management LLC | 2,935,253 | $6.31M | 0.01% | −330,322−10.1% | Reduced |
| Nantahala Capital Management, LLC | 2,815,983 | $6.05M | 0.38% | +2,815,983 | New |
| Vanguard Portfolio Management LLC | 2,583,542 | $5.55M | 0.00% | +2,583,542 | New |
| Geode Capital Management, LLC | 2,286,218 | $4.92M | 0.00% | +210,998+10.2% | Added |
| Jacobs Levy Equity Management, Inc | 2,154,361 | $4.63M | 0.02% | −18,841−0.9% | Reduced |
| Spruce Street Capital LP | 2,101,068 | $4.52M | 1.09% | +983,082+87.9% | Added |
| Ikarian Capital, LLC | 2,082,606 | $4.48M | 0.64% | 00.0% | Unchanged |
| Kynam Capital Management, LP | 2,000,000 | $4.30M | 0.27% | 00.0% | Unchanged |
| Millennium Management LLC | 1,979,226 | $4.26M | 0.00% | +646,312+48.5% | Added |
| State Street Corp | 1,865,526 | $4.01M | 0.00% | +51,228+2.8% | Added |
| FMR LLC | 1,796,104 | $3.86M | 0.00% | −435,067−19.5% | Reduced |
| Medici Capital LLC | 1,652,520 | $3.55M | 4.97% | +152,000+10.1% | Added |
| Eversept Partners, LP | 1,351,106 | $2.90M | 0.19% | +344,943+34.3% | Added |
| Euclidean Capital LLC | 1,307,858 | $2.81M | 0.72% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 1,287,691 | $2.77M | 0.00% | −255,959−16.6% | Reduced |
| Two Sigma Investments, LP | 1,279,306 | $2.75M | 0.00% | +239,650+23.1% | Added |
| Deutsche Bank AG | 1,092,903 | $2.35M | 0.00% | +57,749+5.6% | Added |
| Deerfield Management Company, L.P. (Series C) | 1,055,192 | $2.27M | 0.03% | 00.0% | Unchanged |
| ADAR1 Capital Management, LLC | 1,050,000 | $2.26M | 0.14% | −58,000−5.2% | Reduced |
| DAFNA Capital Management LLC | 908,351 | $1.95M | 0.44% | 00.0% | Unchanged |
| Elmind Capital, LP | 900,000 | $1.94M | 0.55% | 00.0% | Unchanged |
| Mackenzie Financial Corp | 857,354 | $1.84M | 0.00% | +197,186+29.9% | Added |
| Charles Schwab Investment Management Inc | 787,408 | $1.69M | 0.00% | +121,917+18.3% | Added |
| AQR Capital Management LLC | 711,334 | $1.53M | 0.00% | +111,765+18.6% | Added |
| Northern Trust Corp | 692,256 | $1.49M | 0.00% | +104,603+17.8% | Added |
| Marshall Wace, LLP | 620,424 | $1.33M | 0.00% | −546,393−46.8% | Reduced |
| Goldman Sachs Group Inc | 604,562 | $1.30M | 0.00% | +166,603+38.0% | Added |
| Panagora Asset Management Inc | 590,388 | $1.27M | 0.00% | −259,910−30.6% | Reduced |
| Vanguard Fiduciary Trust Co | 577,939 | $1.24M | 0.00% | +577,939 | New |
| XTX Topco Ltd | 559,896 | $1.20M | 0.02% | −32,943−5.6% | Reduced |
| Boothbay Fund Management, LLC | 559,726 | $1.20M | 0.03% | 00.0% | Unchanged |
| Affinity Asset Advisors, LLC | 500,000 | $1.07M | 0.06% | +500,000 | New |
| Jane Street Group, LLC | 399,464 | $858.8K | 0.00% | −594,449−59.8% | Reduced |
| Bank of America Corp | 380,908 | $819.0K | 0.00% | +246,402+183.2% | Added |
| Morgan Stanley | 364,567 | $783.8K | 0.00% | +45,495+14.3% | Added |
| Dimensional Fund Advisors LP | 283,817 | $609.8K | 0.00% | +84,691+42.5% | Added |
| Ameriprise Financial Inc | 271,272 | $583.2K | 0.00% | −83,027−23.4% | Reduced |
| Invesco Ltd. | 265,067 | $569.9K | 0.00% | −14,401−5.2% | Reduced |
| Bank of New York Mellon Corp | 252,297 | $542.4K | 0.00% | +34,435+15.8% | Added |
| Nano Cap New Millennium Growth Fund L P | 200,000 | $430.0K | 0.40% | 00.0% | Unchanged |
| Canada Pension Plan Investment Board | 183,200 | $393.9K | 0.00% | +10,900+6.3% | Added |
| Nuveen, LLC | 154,930 | $333.1K | 0.00% | +21,682+16.3% | Added |
| Utah Retirement Systems | 154,290 | $331.7K | 0.00% | +20,572+15.4% | Added |
| UBS Group AG | 145,344 | $312.5K | 0.00% | +25,933+21.7% | Added |
| Bridgeway Capital Management, LLC | 142,500 | $306.4K | 0.01% | +27,500+23.9% | Added |
| Public Employees Retirement System of Ohio | 136,000 | $292.4K | 0.00% | 00.0% | Unchanged |
| Susquehanna International Group, LLP | 107,597 | $231.3K | 0.00% | −183,583−63.0% | Reduced |
| Rhumbline Advisers | 101,327 | $217.8K | 0.00% | −599−0.6% | Reduced |
| Odyssean, LLC | 89,783 | $193.0K | 0.07% | +89,783 | New |
| STRS Ohio | 86,500 | $186.0K | 0.00% | −23,900−21.6% | Reduced |
| Point72 Asset Management, L.P. | 80,091 | $172.2K | 0.00% | +56,989+246.7% | Added |
| Gsa Capital Partners LLP | 78,207 | $168.0K | 0.01% | −147,359−65.3% | Reduced |
| Citadel Advisors LLC | 77,545 | $166.7K | 0.00% | −16,002−17.1% | Reduced |
| Blackstone Group Inc. | 77,145 | $165.9K | 0.00% | +10,286+15.4% | Added |
| Jasper Ridge Partners, L.P. | 73,531 | $158.1K | 0.00% | −21,537−22.7% | Reduced |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 69,666 | $149.8K | 0.00% | +69,666 | New |
| Simplex Trading, LLC | 68,477 | $147.2K | 0.00% | −13,540−16.5% | Reduced |
| Alliancebernstein L.P. | 92,940 | $145.0K | 0.00% | 00.0% | Unchanged |
| Russell Investments Group, Ltd. | 66,131 | $142.2K | 0.00% | −5,756−8.0% | Reduced |
| Price T Rowe Associates Inc | 56,100 | $121.0K | 0.00% | −103−0.2% | Reduced |
| Spears Abacus Advisors LLC | 54,642 | $117.5K | 0.00% | 00.0% | Unchanged |
| SEI Investments Co | 53,846 | $115.8K | 0.00% | +36,962+218.9% | Added |
| JustInvest LLC | 50,629 | $108.9K | 0.00% | −2,427−4.6% | Reduced |
| HSBC Holdings PLC | 48,523 | $104.8K | 0.00% | +20.0% | Added |
| Ieq Capital, LLC | 47,080 | $101.2K | 0.00% | +47,080 | New |
| Mirae Asset Global ETFs Holdings Ltd. | 42,661 | $91.7K | 0.00% | +5,390+14.5% | Added |
| Barclays PLC | 42,591 | $91.6K | 0.00% | −356,096−89.3% | Reduced |
| MetLife Investment Management | 36,208 | $77.8K | 0.00% | +36,208 | New |
| JPMorgan Chase & Co | 37,379 | $75.5K | 0.00% | +4,756+14.6% | Added |
| Wells Fargo & Company | 34,526 | $74.2K | 0.00% | −55,582−61.7% | Reduced |
| Vanguard Global Advisers, LLC | 31,302 | $67.3K | 0.00% | +31,302 | New |
| Vontobel Holding Ltd. | 30,000 | $64.5K | 0.00% | 00.0% | Unchanged |
| CWM, LLC | 28,985 | $62.3K | 0.00% | +16,821+138.3% | Added |
| Cerity Partners LLC | 26,976 | $58.0K | 0.00% | +13,294+97.2% | Added |
| Manufacturers Life Insurance Company, The | 26,148 | $56.2K | 0.00% | −2,681−9.3% | Reduced |
| Diversified Trust Co | 25,895 | $55.7K | 0.00% | +11,793+83.6% | Added |
| Intech Investment Management LLC | 23,954 | $51.5K | 0.00% | −10,556−30.6% | Reduced |
| Prudential Financial Inc | 23,795 | $51.2K | 0.00% | −8,430−26.2% | Reduced |
| Verdad Advisers, LP | 23,554 | $50.6K | 0.06% | +23,554 | New |
| Police & Firemen's Retirement System of New Jersey | 23,426 | $50.4K | 0.00% | 00.0% | Unchanged |
| Wealth Enhancement Advisory Services, LLC | 18,197 | $43.9K | 0.00% | +18,197 | New |
| BNP Paribas Arbitrage, SA | 20,027 | $43.1K | 0.00% | −2,358−10.5% | Reduced |
| Quadrature Capital Ltd | 19,486 | $41.9K | 0.00% | −42,787−68.7% | Reduced |
| Bronte Capital Management Pty Ltd. | 19,282 | $41.5K | 0.00% | 00.0% | Unchanged |
| Mariner, LLC | 18,799 | $40.4K | 0.00% | +18,799 | New |
| Voya Investment Management LLC | 15,478 | $33.3K | 0.00% | +1,549+11.1% | Added |
| Neuberger Berman Group LLC | 14,528 | $31.2K | 0.00% | +355+2.5% | Added |
| Hamilton Lane Advisors LLC | 14,400 | $31.0K | 0.02% | +14,400 | New |
| ProShare Advisors LLC | 13,188 | $28.4K | 0.00% | −1,484−10.1% | Reduced |
| Merit Financial Group, LLC | 10,928 | $23.5K | 0.00% | +10,928 | New |
| HighTower Advisors, LLC | 10,760 | $23.1K | 0.00% | +749+7.5% | Added |
| Captrust Financial Advisors | 10,648 | $22.9K | 0.00% | +10,648 | New |