AlectorALEC
13F holders, Q2 2026 (June 30)140holders +2
13new positions
9sold out
6famous investors
$2.01avg. 13F price*
At the end of Q2 2026, 140 institutions reported holding Alector Inc. (ALEC) in their 13F filings, up 2 from Q1 2026. 13 opened new positions and 9 sold out. The largest holders were TCG Crossover Management, LLC ($20.1M), BlackRock, Inc. ($15.8M) and Acadian Asset Management LLC ($8.9M). 6 famous investors held it, including David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio), Israel Englander (0.0% of Millennium Management's portfolio) and Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio).
- Company
- Alector Inc.
- CUSIP
- 014442107
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 13 | $1.3M |
| Exits | 9 | $9.6M |
All 13F filers, Q1 2026 → Q2 2026: 10,612,420 shares bought and 7,742,535 shares sold, net +2,869,885 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 140 holders
| TCG Crossover Management, LLC | 0.48% | No change | 10,000,000 | $20.1M |
| BlackRock, Inc. | 0.00% | Add +1.4% | 7,847,879 | $15.8M |
| Acadian Asset Management LLC | 0.01% | Add +9.3% | 4,414,345 | $8.9M |
| Nantahala Capital Management, LLC | 0.53% | Add +53.3% | 4,318,109 | $8.7M |
| Vanguard Capital Management LLC | 0.00% | Add +9.0% | 4,009,340 | $8.1M |
| Kynam Capital Management, LP | 0.42% | Add +90.4% | 3,808,494 | $7.7M |
| Merck & Co., Inc. | 1.35% | No change | 3,545,719 | $7.1M |
| Balyasny Asset Management L.P. | 0.01% | Add +10.6% | 3,247,426 | $6.5M |
| 683 Capital Management, LLC | 0.62% | No change | 3,200,000 | $6.4M |
| D. E. Shaw & Co. | 0.00% | Reduce -11.2% | 2,959,983 | $5.9M |
| ADAR1 Capital Management, LLC | 0.27% | Add +174.6% | 2,883,583 | $5.8M |
| Vanguard Portfolio Management LLC | 0.00% | Add +9.2% | 2,820,493 | $5.7M |
| Geode Capital Management, LLC | 0.00% | Add +7.3% | 2,454,271 | $4.9M |
| Spruce Street Capital LP | 0.83% | No change | 2,101,068 | $4.2M |
| Millennium Management | 0.00% | Add +0.5% | 1,988,835 | $4.0M |
| Ikarian Capital, LLC | 0.65% | Reduce -4.8% | 1,982,606 | $4.0M |
| State Street Corp. | 0.00% | Add +0.8% | 1,879,765 | $3.8M |
| Jacobs Levy Equity Management, Inc. | 0.01% | Reduce -18.0% | 1,765,929 | $3.5M |
| Medici Capital LLC | 6.51% | No change | 1,652,520 | $3.3M |
| Affinity Asset Advisors, LLC | 0.15% | Add +202.0% | 1,510,000 | $3.0M |
| Eversept Partners, LP | 0.16% | Add +5.4% | 1,423,873 | $2.9M |
| FMR LLC | 0.00% | Reduce -22.3% | 1,396,398 | $2.8M |
| AQR Capital Management | 0.00% | Add +84.1% | 1,309,577 | $2.6M |
| Euclidean Capital LLC | 0.60% | No change | 1,307,858 | $2.6M |
| Mackenzie Financial Corp. | 0.00% | Add +29.4% | 1,109,770 | $2.2M |
| Deutsche Bank AG | 0.00% | Add +0.5% | 1,098,388 | $2.2M |
| Deerfield Management Company, L.P. | 0.03% | No change | 1,055,192 | $2.1M |
| Two Sigma Investments, LP | 0.00% | Reduce -18.3% | 1,045,376 | $2.1M |
| Renaissance Technologies | 0.00% | Reduce -27.4% | 935,166 | $1.9M |
| DAFNA Capital Management LLC | 0.35% | No change | 908,351 | $1.8M |
| Elmind Capital, LP | 0.45% | No change | 900,000 | $1.8M |
| Panagora Asset Management Inc. | 0.01% | Add +43.3% | 845,999 | $1.7M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +4.0% | 818,831 | $1.6M |
| Northern Trust Corp. | 0.00% | Add +11.7% | 773,462 | $1.6M |
| Vanguard Fiduciary Trust Co. | 0.00% | Add +14.8% | 663,592 | $1.3M |
| Marshall Wace, LLP | 0.00% | Reduce -3.5% | 598,559 | $1.2M |
| Boothbay Fund Management, LLC | 0.02% | Reduce -4.8% | 532,850 | $1.1M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -28.2% | 433,875 | $872K |
| XTX Topco Ltd | 0.01% | Reduce -28.6% | 399,681 | $803K |
| Citadel Advisors | 0.00% | Add +404.5% | 391,232 | $786K |
| Cantor Fitzgerald, L. P. | 0.01% | New | 295,492 | $594K |
| UBS Group AG | 0.00% | Add +88.4% | 273,780 | $550K |
| Invesco Ltd. | 0.00% | Reduce -3.0% | 257,139 | $517K |
| Bank of New York Mellon Corp | 0.00% | Reduce -0.9% | 250,093 | $503K |
| Ameriprise Financial Inc. | 0.00% | Reduce -17.2% | 224,530 | $451K |
| Nano Cap New Millennium Growth Fund L P | 0.31% | No change | 200,000 | $402K |
| LMR Partners LLP | 0.00% | New | 200,000 | $402K |
| Nuveen, LLC | 0.00% | Add +13.8% | 176,234 | $354K |
| Utah Retirement Systems | 0.00% | No change | 154,290 | $310K |
| Bank of America Corp. | 0.00% | Reduce -62.5% | 142,678 | $287K |
| Bridgeway Capital Management, LLC | 0.01% | No change | 142,500 | $286K |
| Canada Pension Plan Investment Board | 0.00% | Reduce -28.3% | 131,300 | $264K |
| Morgan Stanley | 0.00% | Reduce -67.0% | 120,480 | $242K |
| Public Employees Retirement System of Ohio | 0.00% | Reduce -11.9% | 119,769 | $241K |
| Alliancebernstein L.P. | 0.00% | Add +17.2% | 108,940 | $234K |
| Rhumbline Advisers | 0.00% | Add +8.1% | 109,532 | $220K |
| STRS Ohio | 0.00% | Add +17.5% | 101,600 | $204K |
| Russell Investments Group, Ltd. | 0.00% | Add +48.9% | 98,496 | $198K |
| Wells Fargo & Company | 0.00% | Add +158.3% | 89,172 | $179K |
| Simplex Trading, LLC | 0.00% | Add +24.8% | 85,488 | $172K |
| T. Rowe Price Associates Inc. | 0.00% | Add +45.5% | 81,655 | $165K |
| Blackstone Inc. | 0.00% | No change | 77,145 | $155K |
| Jasper Ridge Partners, L.P. | 0.00% | No change | 73,531 | $148K |
| Sei Investments Co. | 0.00% | Add +32.1% | 71,151 | $143K |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 0.00% | No change | 69,666 | $140K |
| Ieq Capital, LLC | 0.00% | Add +28.6% | 60,570 | $122K |
| Verdad Advisers, LP | 0.12% | Add +156.9% | 60,509 | $122K |
| MetLife Investment Management, LLC | 0.00% | Add +62.1% | 58,696 | $118K |
| Mariner, LLC | 0.00% | Add +180.4% | 52,709 | $106K |
| Vanguard Personalized Indexing Management, LLC | 0.00% | Reduce -2.3% | 49,445 | $99K |
| HSBC Holdings PLC | 0.00% | No change | 48,523 | $98K |
| Graham Capital Management, L.P. | 0.00% | New | 46,496 | $93K |
| Citigroup Inc. | 0.00% | Add +897.5% | 46,275 | $93K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +5.9% | 45,190 | $91K |
| Barclays PLC | 0.00% | Add +5.6% | 44,957 | $90K |
| JPMorgan Chase & Co. | 0.00% | Add +15.0% | 42,998 | $89K |
| Diversified Trust Co. | 0.00% | Add +63.5% | 42,351 | $85K |
| Dimensional Fund Advisors LP | 0.00% | Reduce -88.1% | 33,728 | $68K |
| Cerity Partners LLC | 0.00% | Add +20.6% | 32,521 | $65K |
| Vanguard Global Advisers, LLC | 0.00% | No change | 31,302 | $63K |
| Cannell & Spears LLC | 0.00% | Reduce -44.5% | 30,342 | $61K |
| Vontobel Holding Ltd. | 0.00% | No change | 30,000 | $60K |
| Point72 Asset Management | 0.00% | Reduce -66.7% | 26,699 | $54K |
| Royal Bank of Canada | 0.00% | Add +270.7% | 26,122 | $53K |
| Mercer Global Advisors Inc. | 0.00% | New | 25,504 | $51K |
| Group One Trading LLC | 0.00% | New | 25,208 | $51K |
| Intech Investment Management LLC | 0.00% | Add +2.4% | 24,530 | $49K |
| Wealth Enhancement Advisory Services, LLC | 0.00% | Add +66.2% | 30,251 | $49K |
| Susquehanna International Group, LLP | 0.00% | Reduce -77.6% | 24,123 | $48K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | No change | 23,426 | $47K |
| Voya Investment Management LLC | 0.00% | Add +41.5% | 21,898 | $44K |
| BNP Paribas Financial Markets | 0.00% | Add +5.9% | 21,200 | $43K |
| Manufacturers Life Insurance Company, The | 0.00% | Reduce -25.8% | 19,397 | $39K |
| Qube Research & Technologies Ltd | 0.00% | New | 16,569 | $33K |
| Captrust Financial Advisors | 0.00% | Add +50.6% | 16,037 | $32K |
| Prudential Financial Inc. | 0.00% | Reduce -32.7% | 16,015 | $32K |
| Creative Planning | 0.00% | New | 15,015 | $30K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +143.1% | 14,450 | $29K |
| Hamilton Lane Advisors LLC | 0.02% | No change | 14,400 | $29K |
| Quadrature Capital Ltd | 0.00% | Reduce -27.3% | 14,169 | $28K |
"% of holder's portfolio" is ALEC's weight in each manager's 13F, not the share of Alector Inc. the manager owns.