Who owns Alector, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of ALEC from SEC Form 13F filings across 140 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 140 institutions disclosed 91.2M shares of Alector, Inc. worth $183.4M — about 82% of shares outstanding; the largest disclosed holder is TCG Crossover Management, LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
140
13F holders
$183.4M
value, 2026 filers
82%
of shares outstanding (91.2M sh)
14
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of ALEC's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | TCG Crossover Management, LLC | 10.0M | $20.1M | 0.5% | 9% | 0.0% |
| 2 | BlackRock, Inc. | 7.8M | $15.8M | 0.0% | 7.1% | +1.4% |
| 3 | ACADIAN ASSET MANAGEMENT LLC | 4.4M | $8.9M | 0.0% | 4% | +9.3% |
| 4 | Nantahala Capital Management, LLC | 4.3M | $8.7M | 0.3% | 3.9% | +53.3% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 4.0M | $8.1M | 0.0% | 3.6% | +9.0% |
| 6 | Kynam Capital Management, LP | 3.8M | $7.7M | 0.4% | 3.4% | +90.4% |
| 7 | Merck & Co., Inc. | 3.5M | $7.1M | 1.4% | 3.2% | 0.0% |
| 8 | Balyasny Asset Management L.P. | 3.2M | $6.5M | 0.0% | 2.9% | +10.6% |
| 9 | 683 Capital Management, LLC | 3.2M | $6.4M | 0.3% | 2.9% | 0.0% |
| 10 | D. E. Shaw & Co., Inc. | 3.0M | $5.9M | 0.0% | 2.7% | -11.2% |
| 11 | ADAR1 Capital Management, LLC | 2.9M | $5.8M | 0.3% | 2.6% | +174.6% |
| 12 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2.8M | $5.7M | 0.0% | 2.5% | +9.2% |
| 13 | GEODE CAPITAL MANAGEMENT, LLC | 2.5M | $4.9M | 0.0% | 2.2% | +7.4% |
| 14 | Spruce Street Capital LP | 2.1M | $4.2M | 0.8% | 1.9% | 0.0% |
| 15 | MILLENNIUM MANAGEMENT LLC | 2.0M | $4.0M | 0.0% | 1.8% | +0.5% |
| 16 | Ikarian Capital, LLC | 2.0M | $4.0M | 0.4% | 1.8% | -4.8% |
| 17 | STATE STREET CORP | 1.9M | $3.8M | 0.0% | 1.7% | +0.8% |
| 18 | JACOBS LEVY EQUITY MANAGEMENT, INC | 1.8M | $3.5M | 0.0% | 1.6% | -18.0% |
| 19 | MEDICI CAPITAL LLC | 1.7M | $3.3M | 6.5% | 1.5% | 0.0% |
| 20 | Affinity Asset Advisors, LLC | 1.5M | $3.0M | 0.1% | 1.4% | +202.0% |
| 21 | Eversept Partners, LP | 1.4M | $2.9M | 0.1% | 1.3% | +5.4% |
| 22 | FMR LLC | 1.4M | $2.8M | 0.0% | 1.3% | -22.3% |
| 23 | AQR CAPITAL MANAGEMENT LLC | 1.3M | $2.6M | 0.0% | 1.2% | +84.1% |
| 24 | Euclidean Capital LLC | 1.3M | $2.6M | 0.6% | 1.2% | 0.0% |
| 25 | MACKENZIE FINANCIAL CORP | 1.1M | $2.2M | 0.0% | 1% | +29.4% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.