ALEC Alector, Inc.
Alector, Inc. (ALEC) Institutional Ownership
What the institutions did with ALEC last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeLargest holders
| Manager | Shares | % of reported |
|---|---|---|
| TCG Crossover Management, LLC | 10.0M | 10.4% |
| Nantahala Capital Management, LLC | 8.6M | 9.0% |
| BlackRock, Inc. | 7.8M | 8.2% |
| ACADIAN ASSET MANAGEMENT LLC | 4.4M | 4.6% |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.0M | 4.2% |
| Kynam Capital Management, LP | 3.8M | 4.0% |
| Merck & Co., Inc. | 3.5M | 3.7% |
| Balyasny Asset Management L.P. | 3.2M | 3.4% |
| 683 Capital Management, LLC | 3.2M | 3.3% |
| D. E. Shaw & Co., Inc. | 3.0M | 3.1% |
| ADAR1 Capital Management, LLC | 2.9M | 3.0% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 2.8M | 2.9% |
| GEODE CAPITAL MANAGEMENT, LLC | 2.5M | 2.6% |
| Spruce Street Capital LP | 2.1M | 2.2% |
| MILLENNIUM MANAGEMENT LLC | 2.0M | 2.1% |
| Ikarian Capital, LLC | 2.0M | 2.1% |
| STATE STREET CORP | 1.9M | 2.0% |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 1.8M | 1.8% |
| MEDICI CAPITAL LLC | 1.7M | 1.7% |
| Affinity Asset Advisors, LLC | 1.5M | 1.6% |
| Eversept Partners, LP | 1.4M | 1.5% |
| FMR LLC | 1.4M | 1.5% |
| AQR CAPITAL MANAGEMENT LLC | 1.3M | 1.4% |
| Euclidean Capital LLC | 1.3M | 1.4% |
| MACKENZIE FINANCIAL CORP | 1.1M | 1.2% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Nantahala Capital Management, LLC | Increased | 2.8M | 8.6M | +5.8M |
| Foresite Capital Management IV, LLC | Sold Out | 3.9M | 0 | -3.9M |
| ADAR1 Capital Management, LLC | Increased | 1.1M | 2.9M | +1.8M |
| Kynam Capital Management, LP | Increased | 2.0M | 3.8M | +1.8M |
| Affinity Asset Advisors, LLC | Increased | 500.0K | 1.5M | +1.0M |
| AQR CAPITAL MANAGEMENT LLC | Increased | 711.3K | 1.3M | +598.2K |
| CANTOR FITZGERALD, L. P. | New | 0 | 591.0K | +591.0K |
| FMR LLC | Reduced | 1.8M | 1.4M | -399.7K |
| JANE STREET GROUP, LLC | Sold Out | 399.5K | 0 | -399.5K |
| JACOBS LEVY EQUITY MANAGEMENT, INC | Reduced | 2.2M | 1.8M | -388.4K |
| ACADIAN ASSET MANAGEMENT LLC | Increased | 4.0M | 4.4M | +375.6K |
| D. E. Shaw & Co., Inc. | Reduced | 3.3M | 3.0M | -372.9K |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | 1.3M | 935.2K | -352.5K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 3.7M | 4.0M | +330.6K |
| CITADEL ADVISORS LLC | Increased | 77.5K | 391.2K | +313.7K |
| Balyasny Asset Management L.P. | Increased | 2.9M | 3.2M | +312.2K |
| PANAGORA ASSET MANAGEMENT INC | Increased | 590.4K | 846.0K | +255.6K |
| MACKENZIE FINANCIAL CORP | Increased | 857.4K | 1.1M | +252.4K |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 283.8K | 33.7K | -250.1K |
| MORGAN STANLEY | Reduced | 364.6K | 120.5K | -244.1K |
| BANK OF AMERICA CORP /DE/ | Reduced | 380.9K | 142.7K | -238.2K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 2.6M | 2.8M | +237.0K |
| TWO SIGMA INVESTMENTS, LP | Reduced | 1.3M | 1.0M | -233.9K |
| LMR Partners LLP | New | 0 | 200.0K | +200.0K |
| GOLDMAN SACHS GROUP INC | Reduced | 604.6K | 433.9K | -170.7K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.