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, Q4 2025
Institutional positions in Alector, Inc. as of Dec 31, 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
- 131
- −14 vs. Q3 2025
- Shares held
- 84.4M
- +10.2M (+13.7%) vs. Q3 2025
- Total value
- $131.5M
- −$88.3M (−40.2%) vs. Q3 2025
- New holders
- 25
- 40 more added
- Sold out
- 39
- 41 more reduced
4 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding Alector, Inc.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| TCG Crossover Management, LLC | 10,000,000 | $15.6M | 0.52% | +10,000,000 | New |
| BlackRock, Inc. | 7,147,766 | $11.2M | 0.00% | −50,207−0.7% | Reduced |
| Vanguard Group Inc | 6,908,054 | $10.8M | 0.00% | +873,395+14.5% | Added |
| Foresite Capital Management IV, LLC | 3,887,200 | $6.06M | 2.64% | +3,887,200 | New |
| Merck & Co., Inc. | 3,545,719 | $5.53M | 2.00% | 00.0% | Unchanged |
| Acadian Asset Management LLC | 3,442,449 | $5.36M | 0.01% | +1,069,464+45.1% | Added |
| 683 Capital Management, LLC | 3,350,000 | $5.23M | 0.43% | +2,350,000+235.0% | Added |
| Balyasny Asset Management LLC | 3,265,575 | $5.09M | 0.01% | +3,265,575 | New |
| D. E. Shaw & Co., Inc. | 2,365,151 | $3.69M | 0.00% | +1,386,947+141.8% | Added |
| FMR LLC | 2,231,171 | $3.48M | 0.00% | −12,950,678−85.3% | Reduced |
| Jacobs Levy Equity Management, Inc | 2,173,202 | $3.39M | 0.01% | +942,228+76.5% | Added |
| Ikarian Capital, LLC | 2,082,606 | $3.25M | 0.42% | +1,322,606+174.0% | Added |
| Geode Capital Management, LLC | 2,075,220 | $3.24M | 0.00% | +213,962+11.5% | Added |
| Kynam Capital Management, LP | 2,000,000 | $3.12M | 0.20% | +2,000,000 | New |
| State Street Corp | 1,814,298 | $2.83M | 0.00% | +79,619+4.6% | Added |
| Renaissance Technologies LLC | 1,543,650 | $2.41M | 0.00% | +594,500+62.6% | Added |
| Medici Capital LLC | 1,500,520 | $2.34M | 2.57% | +1,018,546+211.3% | Added |
| Millennium Management LLC | 1,332,914 | $2.08M | 0.00% | +177,887+15.4% | Added |
| Euclidean Capital LLC | 1,307,858 | $2.04M | 0.55% | 00.0% | Unchanged |
| Marshall Wace, LLP | 1,166,817 | $1.82M | 0.00% | +1,015,174+669.4% | Added |
| Spruce Street Capital LP | 1,117,986 | $1.74M | 0.58% | +1,117,986 | New |
| ADAR1 Capital Management, LLC | 1,108,000 | $1.73M | 0.13% | +1,108,000 | New |
| Deerfield Management Company, L.P. (Series C) | 1,055,192 | $1.65M | 0.02% | 00.0% | Unchanged |
| Two Sigma Investments, LP | 1,039,656 | $1.62M | 0.00% | +732,477+238.5% | Added |
| Deutsche Bank AG | 1,035,154 | $1.61M | 0.00% | −33,061−3.1% | Reduced |
| Eversept Partners, LP | 1,006,163 | $1.57M | 0.09% | −482,562−32.4% | Reduced |
| Jane Street Group, LLC | 993,913 | $1.55M | 0.00% | +643,682+183.8% | Added |
| DAFNA Capital Management LLC | 908,351 | $1.42M | 0.33% | +110,000+13.8% | Added |
| Elmind Capital, LP | 900,000 | $1.40M | 0.41% | +900,000 | New |
| Panagora Asset Management Inc | 850,298 | $1.33M | 0.00% | +109,005+14.7% | Added |
| Vestal Point Capital, LP | 755,000 | $1.18M | 0.04% | −225,000−23.0% | Reduced |
| Charles Schwab Investment Management Inc | 665,491 | $1.04M | 0.00% | −24,033−3.5% | Reduced |
| Two Sigma Advisers, LP | 651,800 | $1.02M | 0.00% | +134,400+26.0% | Added |
| Mackenzie Financial Corp | 660,168 | $1.00M | 0.00% | +376,456+132.7% | Added |
| AQR Capital Management LLC | 599,569 | $935.3K | 0.00% | +161,482+36.9% | Added |
| XTX Topco Ltd | 592,839 | $924.8K | 0.02% | +494,326+501.8% | Added |
| Northern Trust Corp | 587,653 | $916.7K | 0.00% | −46,056−7.3% | Reduced |
| Boothbay Fund Management, LLC | 559,726 | $873.2K | 0.02% | +35,649+6.8% | Added |
| Goldman Sachs Group Inc | 437,959 | $683.2K | 0.00% | −171,950−28.2% | Reduced |
| Barclays PLC | 398,687 | $622.0K | 0.00% | −474,688−54.4% | Reduced |
| Ameriprise Financial Inc | 354,299 | $552.7K | 0.00% | +80,257+29.3% | Added |
| Morgan Stanley | 319,072 | $497.8K | 0.00% | −115,096−26.5% | Reduced |
| Susquehanna International Group, LLP | 291,180 | $454.2K | 0.00% | −17,480−5.7% | Reduced |
| Invesco Ltd. | 279,468 | $436.0K | 0.00% | +87,157+45.3% | Added |
| Gsa Capital Partners LLP | 225,566 | $352.0K | 0.03% | +225,566 | New |
| Bank of New York Mellon Corp | 217,862 | $339.9K | 0.00% | −6,622−2.9% | Reduced |
| Nano Cap New Millennium Growth Fund L P | 200,000 | $312.0K | 0.27% | +200,000 | New |
| Dimensional Fund Advisors LP | 199,126 | $310.5K | 0.00% | −96,720−32.7% | Reduced |
| Canada Pension Plan Investment Board | 172,300 | $268.8K | 0.00% | +172,300 | New |
| Public Employees Retirement System of Ohio | 136,000 | $212.2K | 0.00% | +67,800+99.4% | Added |
| Bank of America Corp | 134,506 | $209.8K | 0.00% | −111,777−45.4% | Reduced |
| Utah Retirement Systems | 133,718 | $208.6K | 0.00% | +61,716+85.7% | Added |
| Nuveen, LLC | 133,248 | $207.9K | 0.00% | 00.0% | Unchanged |
| UBS Group AG | 119,411 | $186.3K | 0.00% | −111,088−48.2% | Reduced |
| Bridgeway Capital Management, LLC | 115,000 | $179.4K | 0.00% | 00.0% | Unchanged |
| STRS Ohio | 110,400 | $172.2K | 0.00% | 00.0% | Unchanged |
| Graham Capital Management, L.P. | 104,851 | $163.6K | 0.01% | +83,636+394.2% | Added |
| Rhumbline Advisers | 101,926 | $159.0K | 0.00% | −12,344−10.8% | Reduced |
| Jasper Ridge Partners, L.P. | 95,068 | $148.3K | 0.00% | +23,292+32.5% | Added |
| Citadel Advisors LLC | 93,547 | $145.9K | 0.00% | −378,034−80.2% | Reduced |
| Alliancebernstein L.P. | 92,940 | $145.0K | 0.00% | 00.0% | Unchanged |
| Los Angeles Capital Management LLC | 93,052 | $141.4K | 0.00% | +1,816+2.0% | Added |
| Wells Fargo & Company | 90,108 | $140.6K | 0.00% | +37,683+71.9% | Added |
| Man Group plc | 86,162 | $134.4K | 0.00% | +86,162 | New |
| Simplex Trading, LLC | 82,017 | $127.9K | 0.00% | −18,927−18.8% | Reduced |
| Squarepoint Ops LLC | 77,618 | $121.1K | 0.00% | +77,618 | New |
| Russell Investments Group, Ltd. | 71,887 | $112.1K | 0.00% | −32,937−31.4% | Reduced |
| Blackstone Group Inc. | 66,859 | $104.3K | 0.00% | +41,144+160.0% | Added |
| Quadrature Capital Ltd | 62,273 | $97.1K | 0.00% | +62,273 | New |
| Price T Rowe Associates Inc | 56,203 | $89.0K | 0.00% | −2,128,829−97.4% | Reduced |
| HRT Financial LP | 57,341 | $89.0K | 0.00% | −2,823−4.7% | Reduced |
| Spears Abacus Advisors LLC | 54,642 | $85.2K | 0.00% | −4,581−7.7% | Reduced |
| Lexington Partners L.P. | 53,488 | $83.4K | 0.02% | +43,380+429.2% | Added |
| JustInvest LLC | 53,056 | $82.8K | 0.00% | −5,264−9.0% | Reduced |
| HSBC Holdings PLC | 48,521 | $75.7K | 0.00% | −145−0.3% | Reduced |
| Oxford Asset Management LLP | 42,905 | $66.9K | 0.02% | +42,905 | New |
| Tudor Investment Corp Et Al | 41,282 | $64.4K | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 39,520 | $61.7K | 0.00% | +37,006+1,472.0% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 37,271 | $58.1K | 0.00% | +5,142+16.0% | Added |
| Intech Investment Management LLC | 34,510 | $53.8K | 0.00% | +1,082+3.2% | Added |
| JPMorgan Chase & Co | 32,623 | $50.9K | 0.00% | −103,762−76.1% | Reduced |
| Prudential Financial Inc | 32,225 | $50.3K | 0.00% | +4,203+15.0% | Added |
| Vontobel Holding Ltd. | 30,000 | $46.8K | 0.00% | +4,000+15.4% | Added |
| Manufacturers Life Insurance Company, The | 28,829 | $45.0K | 0.00% | −187,745−86.7% | Reduced |
| SG Americas Securities, LLC | 27,002 | $42.0K | 0.00% | +27,002 | New |
| Dynamic Technology Lab Private Ltd | 25,881 | $40.0K | 0.01% | +25,881 | New |
| Police & Firemen's Retirement System of New Jersey | 23,426 | $36.5K | 0.00% | 00.0% | Unchanged |
| Point72 Asset Management, L.P. | 23,102 | $36.0K | 0.00% | +22,560+4,162.4% | Added |
| BNP Paribas Arbitrage, SA | 22,385 | $34.9K | 0.00% | +4,116+22.5% | Added |
| Virtu Financial LLC | 21,886 | $34.0K | 0.00% | +21,886 | New |
| Hershey Trust Co | 20,572 | $32.1K | 0.00% | +10,286+100.0% | Added |
| Bronte Capital Management Pty Ltd. | 19,282 | $30.1K | 0.00% | +19,282 | New |
| SEI Investments Co | 16,884 | $26.3K | 0.00% | 00.0% | Unchanged |
| ProShare Advisors LLC | 14,672 | $22.9K | 0.00% | −759−4.9% | Reduced |
| Neuberger Berman Group LLC | 14,173 | $22.1K | 0.00% | +14,173 | New |
| Diversified Trust Co | 14,102 | $22.0K | 0.00% | 00.0% | Unchanged |
| Voya Investment Management LLC | 13,929 | $21.7K | 0.00% | 00.0% | Unchanged |
| Cerity Partners LLC | 13,682 | $21.3K | 0.00% | −13,125−49.0% | Reduced |
| R Squared Ltd | 12,474 | $19.5K | 0.01% | +12,474 | New |
| CWM, LLC | 12,164 | $19.0K | 0.00% | −13,005−51.7% | Reduced |