AlectorALEC
13F holders, Q1 2026 (March 31)138holders +7
25new positions
19sold out
6famous investors
$2.15avg. 13F price*
At the end of Q1 2026, 138 institutions reported holding Alector Inc. (ALEC) in their 13F filings, up 7 from Q4 2025. 25 opened new positions and 19 sold out. The largest holders were TCG Crossover Management, LLC ($21.5M), BlackRock, Inc. ($16.6M) and Acadian Asset Management LLC ($8.7M). 6 famous investors held it, including David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio), Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Alector Inc.
- CUSIP
- 014442107
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 25 | $7.9M |
| Exits | 19 | $2.9M |
All 13F filers, Q4 2025 → Q1 2026: 9,891,610 shares bought and 5,253,973 shares sold, net +4,637,637 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 138 holders
| TCG Crossover Management, LLC | 0.62% | No change | 10,000,000 | $21.5M |
| BlackRock, Inc. | 0.00% | Add +8.3% | 7,741,245 | $16.6M |
| Acadian Asset Management LLC | 0.01% | Add +17.3% | 4,038,785 | $8.7M |
| Foresite Capital Management IV, LLC | 3.53% | No change | 3,887,200 | $8.4M |
| Vanguard Capital Management LLC | 0.00% | — | 3,678,722 | $7.9M |
| Merck & Co., Inc. | 2.18% | No change | 3,545,719 | $7.6M |
| D. E. Shaw & Co. | 0.01% | Add +40.9% | 3,332,835 | $7.2M |
| 683 Capital Management, LLC | 0.67% | Reduce -4.5% | 3,200,000 | $6.9M |
| Balyasny Asset Management L.P. | 0.01% | Reduce -10.1% | 2,935,253 | $6.3M |
| Nantahala Capital Management, LLC | 0.38% | New | 2,815,983 | $6.1M |
| Vanguard Portfolio Management LLC | 0.00% | — | 2,583,542 | $5.6M |
| Geode Capital Management, LLC | 0.00% | Add +10.2% | 2,286,218 | $4.9M |
| Jacobs Levy Equity Management, Inc. | 0.02% | Reduce -0.9% | 2,154,361 | $4.6M |
| Spruce Street Capital LP | 1.09% | Add +87.9% | 2,101,068 | $4.5M |
| Ikarian Capital, LLC | 0.64% | No change | 2,082,606 | $4.5M |
| Kynam Capital Management, LP | 0.27% | No change | 2,000,000 | $4.3M |
| Millennium Management | 0.00% | Add +48.5% | 1,979,226 | $4.3M |
| State Street Corp. | 0.00% | Add +2.8% | 1,865,526 | $4.0M |
| FMR LLC | 0.00% | Reduce -19.5% | 1,796,104 | $3.9M |
| Medici Capital LLC | 4.96% | Add +10.1% | 1,652,520 | $3.6M |
| Eversept Partners, LP | 0.19% | Add +34.3% | 1,351,106 | $2.9M |
| Euclidean Capital LLC | 0.72% | No change | 1,307,858 | $2.8M |
| Renaissance Technologies | 0.00% | Reduce -16.6% | 1,287,691 | $2.8M |
| Two Sigma Investments, LP | 0.00% | Add +23.1% | 1,279,306 | $2.8M |
| Deutsche Bank AG | 0.00% | Add +5.6% | 1,092,903 | $2.3M |
| Deerfield Management Company, L.P. | 0.03% | No change | 1,055,192 | $2.3M |
| ADAR1 Capital Management, LLC | 0.14% | Reduce -5.2% | 1,050,000 | $2.3M |
| DAFNA Capital Management LLC | 0.45% | No change | 908,351 | $2.0M |
| Elmind Capital, LP | 0.55% | No change | 900,000 | $1.9M |
| Mackenzie Financial Corp. | 0.00% | Add +29.9% | 857,354 | $1.8M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +18.3% | 787,408 | $1.7M |
| AQR Capital Management | 0.00% | Add +18.6% | 711,334 | $1.5M |
| Northern Trust Corp. | 0.00% | Add +17.8% | 692,256 | $1.5M |
| Marshall Wace, LLP | 0.00% | Reduce -46.8% | 620,424 | $1.3M |
| Goldman Sachs Group Inc. | 0.00% | Add +38.0% | 604,562 | $1.3M |
| Panagora Asset Management Inc. | 0.00% | Reduce -30.6% | 590,388 | $1.3M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 577,939 | $1.2M |
| XTX Topco Ltd | 0.02% | Reduce -5.6% | 559,896 | $1.2M |
| Boothbay Fund Management, LLC | 0.03% | No change | 559,726 | $1.2M |
| Affinity Asset Advisors, LLC | 0.06% | New | 500,000 | $1.1M |
| Jane Street Group, LLC | 0.00% | Reduce -59.8% | 399,464 | $859K |
| Bank of America Corp. | 0.00% | Add +183.2% | 380,908 | $819K |
| Morgan Stanley | 0.00% | Add +14.3% | 364,567 | $784K |
| Dimensional Fund Advisors LP | 0.00% | Add +42.5% | 283,817 | $610K |
| Ameriprise Financial Inc. | 0.00% | Reduce -23.4% | 271,272 | $583K |
| Invesco Ltd. | 0.00% | Reduce -5.2% | 265,067 | $570K |
| Bank of New York Mellon Corp | 0.00% | Add +15.8% | 252,297 | $542K |
| Nano Cap New Millennium Growth Fund L P | 0.40% | No change | 200,000 | $430K |
| Canada Pension Plan Investment Board | 0.00% | Add +6.3% | 183,200 | $394K |
| Nuveen, LLC | 0.00% | Add +16.3% | 154,930 | $333K |
| Utah Retirement Systems | 0.00% | Add +15.4% | 154,290 | $332K |
| UBS Group AG | 0.00% | Add +21.7% | 145,344 | $312K |
| Bridgeway Capital Management, LLC | 0.01% | Add +23.9% | 142,500 | $306K |
| Public Employees Retirement System of Ohio | 0.00% | No change | 136,000 | $292K |
| Susquehanna International Group, LLP | 0.00% | Reduce -63.0% | 107,597 | $231K |
| Rhumbline Advisers | 0.00% | Reduce -0.6% | 101,327 | $218K |
| Odyssean, LLC | 0.07% | New | 89,783 | $193K |
| STRS Ohio | 0.00% | Reduce -21.6% | 86,500 | $186K |
| Point72 Asset Management | 0.00% | Add +246.7% | 80,091 | $172K |
| Gsa Capital Partners LLP | 0.01% | Reduce -65.3% | 78,207 | $168K |
| Citadel Advisors | 0.00% | Reduce -17.1% | 77,545 | $167K |
| Blackstone Inc. | 0.00% | Add +15.4% | 77,145 | $166K |
| Jasper Ridge Partners, L.P. | 0.00% | Reduce -22.6% | 73,531 | $158K |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 0.00% | New | 69,666 | $150K |
| Simplex Trading, LLC | 0.00% | Reduce -16.5% | 68,477 | $147K |
| Alliancebernstein L.P. | 0.00% | No change | 92,940 | $145K |
| Russell Investments Group, Ltd. | 0.00% | Reduce -8.0% | 66,131 | $142K |
| T. Rowe Price Associates Inc. | 0.00% | Reduce -0.2% | 56,100 | $121K |
| Cannell & Spears LLC | 0.00% | No change | 54,642 | $117K |
| Sei Investments Co. | 0.00% | Add +218.9% | 53,846 | $116K |
| Vanguard Personalized Indexing Management, LLC | 0.00% | Reduce -4.6% | 50,629 | $109K |
| HSBC Holdings PLC | 0.00% | Add +0.0% | 48,523 | $105K |
| Ieq Capital, LLC | 0.00% | New | 47,080 | $101K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +14.5% | 42,661 | $92K |
| Barclays PLC | 0.00% | Reduce -89.3% | 42,591 | $92K |
| MetLife Investment Management, LLC | 0.00% | New | 36,208 | $78K |
| JPMorgan Chase & Co. | 0.00% | Add +14.6% | 37,379 | $76K |
| Wells Fargo & Company | 0.00% | Reduce -61.7% | 34,526 | $74K |
| Vanguard Global Advisers, LLC | 0.00% | — | 31,302 | $67K |
| Vontobel Holding Ltd. | 0.00% | No change | 30,000 | $65K |
| Cwm, LLC | 0.00% | Add +138.3% | 28,985 | $62K |
| Cerity Partners LLC | 0.00% | Add +97.2% | 26,976 | $58K |
| Manufacturers Life Insurance Company, The | 0.00% | Reduce -9.3% | 26,148 | $56K |
| Diversified Trust Co. | 0.00% | Add +83.6% | 25,895 | $56K |
| Intech Investment Management LLC | 0.00% | Reduce -30.6% | 23,954 | $52K |
| Prudential Financial Inc. | 0.00% | Reduce -26.2% | 23,795 | $51K |
| Verdad Advisers, LP | 0.06% | New | 23,554 | $51K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | No change | 23,426 | $50K |
| Wealth Enhancement Advisory Services, LLC | 0.00% | New | 18,197 | $44K |
| BNP Paribas Financial Markets | 0.00% | Reduce -10.5% | 20,027 | $43K |
| Quadrature Capital Ltd | 0.00% | Reduce -68.7% | 19,486 | $42K |
| Bronte Capital Management Pty Ltd. | 0.00% | No change | 19,282 | $41K |
| Mariner, LLC | 0.00% | New | 18,799 | $40K |
| Voya Investment Management LLC | 0.00% | Add +11.1% | 15,478 | $33K |
| Neuberger Berman Group LLC | 0.00% | Add +2.5% | 14,528 | $31K |
| Hamilton Lane Advisors LLC | 0.02% | New | 14,400 | $31K |
| ProShare Advisors LLC | 0.00% | Reduce -10.1% | 13,188 | $28K |
| Merit Financial Group, LLC | 0.00% | New | 10,928 | $23K |
| HighTower Advisors, LLC | 0.00% | Add +7.5% | 10,760 | $23K |
| Captrust Financial Advisors | 0.00% | New | 10,648 | $23K |
"% of holder's portfolio" is ALEC's weight in each manager's 13F, not the share of Alector Inc. the manager owns.