Who owns Alector, Inc.?
Institutional ownership of ALEC from SEC Form 13F filings across 95 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.
95
13F holders
$98.1M
value, 2026 filers
48%
of shares outstanding (53.3M sh)
11
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 | $8,863 | 0.0% | 4% | +9.3% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 4.0M | $8.1M | 0.0% | 3.6% | -45.5% |
| 5 | Balyasny Asset Management L.P. | 3.2M | $6.5M | 0.0% | 2.9% | +10.6% |
| 6 | D. E. Shaw & Co., Inc. | 3.0M | $5.9M | 0.0% | 2.7% | -11.2% |
| 7 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2.8M | $5.7M | 0.0% | 2.5% | +9.2% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 2.5M | $4.9M | 0.0% | 2.2% | +7.4% |
| 9 | MILLENNIUM MANAGEMENT LLC | 2.0M | $4.0M | 0.0% | 1.8% | +0.5% |
| 10 | FMR LLC | 1.4M | $2.8M | 0.0% | 1.3% | -22.3% |
| 11 | MACKENZIE FINANCIAL CORP | 1.1M | $2.2M | 0.0% | 1% | +29.4% |
| 12 | DEUTSCHE BANK AG\ | 1.1M | $2.2M | 0.0% | 1% | +0.5% |
| 13 | TWO SIGMA INVESTMENTS, LP | 1.0M | $2.1M | 0.0% | 0.9% | -18.3% |
| 14 | Sixth Street Partners Management Company, L.P.NEW | 818,831 | $1.6M | 0.3% | 0.7% | new |
| 15 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 818,831 | $1.6M | 0.0% | 0.7% | +4.0% |
| 16 | NORTHERN TRUST CORP | 773,462 | $1.6M | 0.0% | 0.7% | +11.7% |
| 17 | VANGUARD FIDUCIARY TRUST CO | 663,592 | $1.3M | 0.0% | 0.6% | +14.8% |
| 18 | MARSHALL WACE, LLP | 598,559 | $1.2M | 0.0% | 0.5% | -3.5% |
| 19 | BOOTHBAY FUND MANAGEMENT, LLC | 532,850 | $1.1M | 0.0% | 0.5% | -4.8% |
| 20 | GOLDMAN SACHS GROUP INC | 433,875 | $872,089 | 0.0% | 0.4% | -28.2% |
| 21 | CITADEL ADVISORS LLC | 391,232 | $786,376 | 0.0% | 0.4% | +404.5% |
| 22 | CANTOR FITZGERALD, L. P.NEW | 295,492 | $593,939 | 0.0% | 0.3% | new |
| 23 | UBS Group AG | 273,780 | $550,298 | 0.0% | 0.2% | +88.4% |
| 24 | Invesco Ltd. | 257,139 | $516,849 | 0.0% | 0.2% | -3.0% |
| 25 | Bank of New York Mellon Corp | 250,093 | $502,688 | 0.0% | 0.2% | -0.9% |
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.