Alector, Inc. (ALEC) — Institutional Holders, Q2 2026
141 institutional investment managers reported a ALEC position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $183.4M. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
ALEC in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- ADAR1 Capital ManagementAdded · +1,833,583 sh+$3.7M
- Kynam Capital ManagementAdded · +1,808,494 sh+$3.6M
- Nantahala Capital ManagementAdded · +1,502,126 sh+$3.0M
- Affinity Asset AdvisorsAdded · +1,010,000 sh+$2.0M
- AQR CAPITAL MANAGEMENTAdded · +598,243 sh+$1.2M
Biggest sellers
- Foresite Capital Management IVSold out · -3,887,200 sh-$7.8M
- FMRTrimmed · -399,706 sh-$803.4K
- JANE STREET GROUPSold out · -399,464 sh-$802.9K
- JACOBS LEVY EQUITY MANAGEMENTTrimmed · -388,432 sh-$780.7K
- D. E. ShawTrimmed · -372,852 sh-$749.4K
ALEC 13F holders ranked 1–100 of 141
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | TCG Crossover Management#1 · 10,000,000 sh | 10,000,000 | $20.1M | 0.48% | 0.0% |
| 2 | BlackRock#2 · 7,847,879 sh | 7,847,879 | $15.8M | <0.01% | +1.4% |
| 3 | ACADIAN ASSET MANAGEMENT#3 · 4,414,345 sh | 4,414,345 | $8.9M | 0.01% | +9.3% |
| 4 | Nantahala Capital Management#4 · 4,318,109 sh | 4,318,109 | $8.7M | 0.29% | +53.3% |
| 5 | VANGUARD CAPITAL MANAGEMENT#5 · 4,009,340 sh | 4,009,340 | $8.1M | <0.01% | +9.0% |
| 6 | Kynam Capital Management#6 · 3,808,494 sh | 3,808,494 | $7.7M | 0.42% | +90.4% |
| 7 | Merck#7 · 3,545,719 sh | 3,545,719 | $7.1M | 1.35% | 0.0% |
| 8 | BALYASNY ASSET MANAGEMENT L.P.#8 · 3,247,426 sh | 3,247,426 | $6.5M | <0.01% | +10.6% |
| 9 | 683 Capital Management#9 · 3,200,000 sh | 3,200,000 | $6.4M | 0.32% | 0.0% |
| 10 | D. E. Shaw#10 · 2,959,983 sh | 2,959,983 | $5.9M | <0.01% | -11.2% |
| 11 | ADAR1 Capital Management#11 · 2,883,583 sh | 2,883,583 | $5.8M | 0.27% | +174.6% |
| 12 | VANGUARD PORTFOLIO MANAGEMENT#12 · 2,820,493 sh | 2,820,493 | $5.7M | <0.01% | +9.2% |
| 13 | GEODE CAPITAL MANAGEMENT#13 · 2,454,271 sh | 2,454,271 | $4.9M | <0.01% | +7.4% |
| 14 | Spruce Street Capital#14 · 2,101,068 sh | 2,101,068 | $4.2M | 0.83% | 0.0% |
| 15 | MILLENNIUM MANAGEMENT#15 · 1,988,835 sh | 1,988,835 | $4.0M | <0.01% | +0.5% |
| 16 | Ikarian Capital#16 · 1,982,606 sh | 1,982,606 | $4.0M | 0.43% | -4.8% |
| 17 | STATE STREET#17 · 1,879,765 sh | 1,879,765 | $3.8M | <0.01% | +0.8% |
| 18 | JACOBS LEVY EQUITY MANAGEMENT#18 · 1,765,929 sh | 1,765,929 | $3.5M | 0.01% | -18.0% |
| 19 | MEDICI CAPITAL#19 · 1,652,520 sh | 1,652,520 | $3.3M | 6.51% | 0.0% |
| 20 | Affinity Asset Advisors#20 · 1,510,000 sh | 1,510,000 | $3.0M | 0.14% | +202.0% |
| 21 | Eversept Partners#21 · 1,423,873 sh | 1,423,873 | $2.9M | 0.15% | +5.4% |
| 22 | FMR#22 · 1,396,398 sh | 1,396,398 | $2.8M | <0.01% | -22.3% |
| 23 | AQR CAPITAL MANAGEMENT#23 · 1,309,577 sh | 1,309,577 | $2.6M | <0.01% | +84.1% |
| 24 | Euclidean Capital#24 · 1,307,858 sh | 1,307,858 | $2.6M | 0.60% | 0.0% |
| 25 | MACKENZIE FINANCIAL#25 · 1,109,770 sh | 1,109,770 | $2.2M | <0.01% | +29.4% |
| 26 | DEUTSCHE BANK AG\#26 · 1,098,388 sh | 1,098,388 | $2.2M | <0.01% | +0.5% |
| 27 | DEERFIELD MANAGEMENT COMPANY, L.P. (SERIES C)#27 · 1,055,192 sh | 1,055,192 | $2.1M | 0.02% | 0.0% |
| 28 | TWO SIGMA INVESTMENTS#28 · 1,045,376 sh | 1,045,376 | $2.1M | <0.01% | -18.3% |
| 29 | RENAISSANCE TECHNOLOGIES#29 · 935,166 sh | 935,166 | $1.9M | <0.01% | -27.4% |
| 30 | DAFNA Capital Management#30 · 908,351 sh | 908,351 | $1.8M | 0.35% | 0.0% |
| 31 | Elmind Capital#31 · 900,000 sh | 900,000 | $1.8M | 0.45% | 0.0% |
| 32 | PANAGORA ASSET MANAGEMENT#32 · 845,999 sh | 845,999 | $1.7M | <0.01% | +43.3% |
| 33 | CHARLES SCHWAB INVESTMENT MANAGEMENT#33 · 818,831 sh | 818,831 | $1.6M | <0.01% | +4.0% |
| 34 | NORTHERN#34 · 773,462 sh | 773,462 | $1.6M | <0.01% | +11.7% |
| 35 | VANGUARD FIDUCIARY#35 · 663,592 sh | 663,592 | $1.3M | <0.01% | +14.8% |
| 36 | MARSHALL WACE, LLP#36 · 598,559 sh | 598,559 | $1.2M | <0.01% | -3.5% |
| 37 | BOOTHBAY FUND MANAGEMENT#37 · 532,850 sh | 532,850 | $1.1M | 0.01% | -4.8% |
| 38 | GOLDMAN SACHS GROUP#38 · 433,875 sh | 433,875 | $872.1K | <0.01% | -28.2% |
| 39 | XTX Topco Ltd#39 · 399,681 sh | 399,681 | $803.4K | 0.01% | -28.6% |
| 40 | CITADEL ADVISORS#40 · 391,232 sh | 391,232 | $786.4K | <0.01% | +404.5% |
| 41 | CANTOR FITZGERALD, L. P.#41 · 295,492 sh | 295,492 | $593.9K | <0.01% | New |
| 42 | UBS Group AG#42 · 273,780 sh | 273,780 | $550.3K | <0.01% | +88.4% |
| 43 | Invesco Ltd.#43 · 257,139 sh | 257,139 | $516.8K | 0.00% | -3.0% |
| 44 | Bank of New York Mellon#44 · 250,093 sh | 250,093 | $502.7K | <0.01% | -0.9% |
| 45 | AMERIPRISE FINANCIAL#45 · 224,530 sh | 224,530 | $451.3K | <0.01% | -17.2% |
| 46 | NANO CAP NEW MILLENNIUM GROWTH FUND L P#46 · 200,000 sh | 200,000 | $402.0K | 0.31% | 0.0% |
| 47 | LMR Partners LLP#47 · 200,000 sh | 200,000 | $402.0K | <0.01% | New |
| 48 | Nuveen#48 · 176,234 sh | 176,234 | $354.2K | <0.01% | +13.8% |
| 49 | Utah Retirement Systems#49 · 154,290 sh | 154,290 | $310.1K | <0.01% | 0.0% |
| 50 | BANK OF AMERICA#50 · 142,678 sh | 142,678 | $286.8K | 0.00% | -62.5% |
| 51 | BRIDGEWAY CAPITAL MANAGEMENT#51 · 142,500 sh | 142,500 | $286.4K | <0.01% | 0.0% |
| 52 | CANADA PENSION PLAN INVESTMENT BOARD#52 · 131,300 sh | 131,300 | $263.9K | <0.01% | -28.3% |
| 53 | MORGAN STANLEY#53 · 120,480 sh | 120,480 | $242.2K | 0.00% | -67.0% |
| 54 | PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO#54 · 119,769 sh | 119,769 | $240.7K | <0.01% | -11.9% |
| 55 | ALLIANCEBERNSTEIN L.P.#55 · 108,940 sh | 108,940 | $234.2K | <0.01% | +17.2% |
| 56 | RHUMBLINE ADVISERS#56 · 109,532 sh | 109,532 | $220.1K | <0.01% | +8.1% |
| 57 | STRS OHIO#57 · 101,600 sh | 101,600 | $204.2K | <0.01% | +17.5% |
| 58 | Russell Investments Group, Ltd.#58 · 98,496 sh | 98,496 | $198.0K | <0.01% | +48.9% |
| 59 | WELLS FARGO & COMPANY#59 · 89,172 sh | 89,172 | $179.2K | 0.00% | +158.3% |
| 60 | SIMPLEX TRADING#60 · 85,488 sh | 85,488 | $171.8K | <0.01% | +24.8% |
| 61 | PRICE T ROWE ASSOCIATES#61 · 81,655 sh | 81,655 | $165.0K | 0.00% | +45.6% |
| 62 | Blackstone#62 · 77,145 sh | 77,145 | $155.1K | <0.01% | 0.0% |
| 63 | Jasper Ridge Partners, L.P.#63 · 73,531 sh | 73,531 | $147.8K | <0.01% | 0.0% |
| 64 | SEI INVESTMENTS#64 · 71,151 sh | 71,151 | $143.0K | <0.01% | +32.1% |
| 65 | DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt#65 · 69,666 sh | 69,666 | $140.0K | <0.01% | 0.0% |
| 66 | IEQ CAPITAL#66 · 60,570 sh | 60,570 | $121.7K | <0.01% | +28.7% |
| 67 | Verdad Advisers#67 · 60,509 sh | 60,509 | $121.6K | 0.12% | +156.9% |
| 68 | MetLife Investment Management#68 · 58,696 sh | 58,696 | $118.0K | <0.01% | +62.1% |
| 69 | Mariner#69 · 52,709 sh | 52,709 | $106.0K | <0.01% | +180.4% |
| 70 | Vanguard Personalized Indexing Management#70 · 49,445 sh | 49,445 | $99.4K | <0.01% | -2.3% |
| 71 | HSBC PLC#71 · 48,523 sh | 48,523 | $98.0K | 0.00% | 0.0% |
| 72 | Graham Capital Management, L.P.#72 · 46,496 sh | 46,496 | $93.5K | <0.01% | New |
| 73 | CITIGROUP#73 · 46,275 sh | 46,275 | $93.0K | 0.00% | +897.5% |
| 74 | MIRAE ASSET GLOBAL ETFS Ltd.#74 · 45,190 sh | 45,190 | $90.8K | <0.01% | +5.9% |
| 75 | BARCLAYS PLC#75 · 44,957 sh | 44,957 | $90.4K | 0.00% | +5.6% |
| 76 | JPMORGAN CHASE#76 · 42,998 sh | 42,998 | $89.4K | 0.00% | +15.0% |
| 77 | Diversified#77 · 42,351 sh | 42,351 | $85.1K | <0.01% | +63.5% |
| 78 | DIMENSIONAL FUND ADVISORS#78 · 33,728 sh | 33,728 | $68.0K | 0.00% | -88.1% |
| 79 | Cerity Partners#79 · 32,521 sh | 32,521 | $65.4K | <0.01% | +20.6% |
| 80 | Vanguard Global Advisers#80 · 31,302 sh | 31,302 | $62.9K | 0.00% | 0.0% |
| 81 | Spears Abacus Advisors#81 · 30,342 sh | 30,342 | $61.0K | <0.01% | -44.5% |
| 82 | Vontobel Holding Ltd.#82 · 30,000 sh | 30,000 | $60.3K | — | 0.0% |
| 83 | Point72 Asset Management, L.P.#83 · 26,699 sh | 26,699 | $53.7K | <0.01% | -66.7% |
| 84 | ROYAL BANK OF CANADA#84 · 26,122 sh | 26,122 | $53.0K | 0.00% | +270.7% |
| 85 | MERCER GLOBAL ADVISORS#85 · 25,504 sh | 25,504 | $51.3K | <0.01% | New |
| 86 | GROUP ONE TRADING, L.P.#86 · 25,208 sh | 25,208 | $50.7K | <0.01% | New |
| 87 | INTECH INVESTMENT MANAGEMENT#87 · 24,530 sh | 24,530 | $49.3K | <0.01% | +2.4% |
| 88 | WEALTH ENHANCEMENT ADVISORY SERVICES#88 · 30,251 sh | 30,251 | $48.7K | — | +66.2% |
| 89 | SUSQUEHANNA INTERNATIONAL GROUP, LLP#89 · 24,123 sh | 24,123 | $48.5K | 0.00% | -77.6% |
| 90 | Police & Firemen's Retirement System of New Jersey#90 · 23,426 sh | 23,426 | $47.1K | <0.01% | 0.0% |
| 91 | VOYA INVESTMENT MANAGEMENT#91 · 21,898 sh | 21,898 | $44.0K | 0.00% | +41.5% |
| 92 | BNP PARIBAS FINANCIAL MARKETS#92 · 21,200 sh | 21,200 | $42.6K | 0.00% | +5.9% |
| 93 | MANUFACTURERS LIFE INSURANCE COMPANY, THE#93 · 19,397 sh | 19,397 | $39.0K | 0.00% | -25.8% |
| 94 | Qube Research & Technologies Ltd#94 · 16,569 sh | 16,569 | $33.3K | 0.00% | New |
| 95 | CAPTRUST FINANCIAL ADVISORS#95 · 16,037 sh | 16,037 | $32.2K | 0.00% | +50.6% |
| 96 | PRUDENTIAL FINANCIAL#96 · 16,015 sh | 16,015 | $32.2K | 0.00% | -32.7% |
| 97 | Creative Planning#97 · 15,015 sh | 15,015 | $30.2K | 0.00% | New |
| 98 | Tower Research Capital (TRC)#98 · 14,450 sh | 14,450 | $29.0K | <0.01% | +143.1% |
| 99 | HAMILTON LANE ADVISORS#99 · 14,400 sh | 14,400 | $28.9K | — | 0.0% |
| 100 | Quadrature Capital Ltd#100 · 14,169 sh | 14,169 | $28.5K | <0.01% | -27.3% |
Funds that sold out of ALEC in Q2 2026 (9)
Held ALEC at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| Foresite Capital Management IV3,887,200 sh | 3,887,200 | $8.4M |
| JANE STREET GROUP399,464 sh | 399,464 | $858.8K |
| Odyssean89,783 sh | 89,783 | $193.0K |
| GSA CAPITAL PARTNERS LLP78,207 sh | 78,207 | $168.0K |
| State of Wyoming1,645 sh | 1,645 | $3.5K |
| Root Financial Partners305 sh | 305 | $656.00 |
| Advisory Services Network271 sh | 271 | $583.00 |
| MAI Capital Management67 sh | 67 | $145.00 |
| Lloyd Advisory Services48 sh | 48 | $103.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.