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.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest 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 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 2.3M | 2.5M | +168.1K |
| XTX Topco Ltd | Reduced | 559.9K | 399.7K | -160.2K |
| UBS Group AG | Increased | 145.3K | 273.8K | +128.4K |
| BlackRock, Inc. | Increased | 7.7M | 7.8M | +106.6K |
| Ikarian Capital, LLC | Reduced | 2.1M | 2.0M | -100.0K |
| Odyssean, LLC | Sold Out | 89.8K | 0 | -89.8K |
| VANGUARD FIDUCIARY TRUST CO | Increased | 577.9K | 663.6K | +85.7K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | 107.6K | 24.1K | -83.5K |
| NORTHERN TRUST CORP | Increased | 692.3K | 773.5K | +81.2K |
| GSA CAPITAL PARTNERS LLP | Sold Out | 78.2K | 0 | -78.2K |
| Eversept Partners, LP | Increased | 1.4M | 1.4M | +72.8K |
| WELLS FARGO & COMPANY/MN | Increased | 34.5K | 89.2K | +54.6K |
| Point72 Asset Management, L.P. | Reduced | 80.1K | 26.7K | -53.4K |
| CANADA PENSION PLAN INVESTMENT BOARD | Reduced | 183.2K | 131.3K | -51.9K |
| AMERIPRISE FINANCIAL INC | Reduced | 271.3K | 224.5K | -46.7K |
| Graham Capital Management, L.P. | New | 0 | 46.5K | +46.5K |
| CITIGROUP INC | Increased | 4.6K | 46.3K | +41.6K |
| Verdad Advisers, LP | Increased | 23.6K | 60.5K | +37.0K |
| Mariner, LLC | Increased | 18.8K | 52.7K | +33.9K |
| Russell Investments Group, Ltd. | Increased | 66.1K | 98.5K | +32.4K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Increased | 787.4K | 818.8K | +31.4K |
| BOOTHBAY FUND MANAGEMENT, LLC | Reduced | 559.7K | 532.9K | -26.9K |
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 56.1K | 81.7K | +25.6K |
| MERCER GLOBAL ADVISORS INC /ADV | New | 0 | 25.5K | +25.5K |
| GROUP ONE TRADING LLC | New | 0 | 25.2K | +25.2K |
| Cannell & Spears LLC | Reduced | 54.6K | 30.3K | -24.3K |
| MetLife Investment Management, LLC | Increased | 36.2K | 58.7K | +22.5K |
| MARSHALL WACE, LLP | Reduced | 620.4K | 598.6K | -21.9K |
| Nuveen, LLC | Increased | 154.9K | 176.2K | +21.3K |
| ROYAL BANK OF CANADA | Increased | 7.0K | 26.1K | +19.1K |
| SEI INVESTMENTS CO | Increased | 53.8K | 71.2K | +17.3K |
| SIMPLEX TRADING, LLC | Increased | 68.5K | 85.5K | +17.0K |
| Qube Research & Technologies Ltd | New | 0 | 16.6K | +16.6K |
| Diversified Trust Co | Increased | 25.9K | 42.4K | +16.5K |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO | Reduced | 136.0K | 119.8K | -16.2K |
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.