Alector, Inc. (ALEC)
Nasdaq: ALEC · Biological Products, (No Diagnostic Substances) · South San Francisco, CA · filing with the SEC since 2015
Who owns Alector, Inc.
As filed with the SECHolders of 5% or more
6
Chen Yu holds 9.2% of Common Stock, par value $0.0001 per share, as its SCHEDULE 13G filed Nov 14, 2025 says.
Directors and officers
11
report now, of 26 people on the record since 2019. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 6 named at left.
Holders of 5% or moreshare of the class, as filed
Chen Yu
SCHEDULE 13G · filed Nov 14, 2025 · Common Stock, par value $0.0001 per share
Deep Track Capital, LP
SCHEDULE 13G · filed Oct 23, 2026 · Common
Bvf Partners L P/il
SCHEDULE 13G · filed Sep 18, 2026 · Common Stock
Arnon Rosenthal
SCHEDULE 13G/A · filed Feb 6, 2026 · Common Stock, $0.0001 par value per share
Blackrock, Inc.
SCHEDULE 13G · filed Apr 27, 2026 · Common Stock · 4.7% in Jan 21, 2026
RA Capital Management, L.P.
SCHEDULE 13G · filed Oct 26, 2026 · Common Stock, $0.0001 par value per share · 0% in Aug 14, 2025
Terrance G. McGuire
SCHEDULE 13G/A · filed May 14, 2026 · Common Stock, $0.0001 par value per share · reported falling below 5%, from 6.5% in Nov 13, 2025
Fmr LLC
SCHEDULE 13G/A · filed Nov 7, 2025 · COMMON STOCK · reported falling below 5%
The Vanguard Group
SCHEDULE 13G/A · filed Mar 26, 2026 · Common Stock · reported falling below 5%, from 6.32% in Jan 30, 2026
RTW Investments, LP
SCHEDULE 13G/A · filed Feb 17, 2026 · Common Stock, $0.0001 par value · reported falling below 5%, from 6.9% in Nov 14, 2025
What ALEC reports owning in othersstakes of 5% or more, and other ties
1 subsidiary in 1 country, from the list filed with the 10-K filed Feb 26, 2025.
Insider tradesForm 4
21sales
0purchases
4sales on a scheduled plan
4people selling
$1.0Msold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Oct 15, 2025 to Oct 15, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Oct 15, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window4 of 31 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Rosenthal Arnon | Chief Executive Officer | 4 | $700,000 | 0 | 0 | $0 |
| Berkley Neil Lindsay | CFO & Chief Business Officer | 4 | $200,000 | 0 | 0 | $0 |
| Wong-Sarad Grace | Principal Accounting Officer | 12 | $100,000 | 4 | 0 | $0 |
| Kenkare-Mitra Sara | President and Head of R&D | 1 | $0 | 0 | 0 | $0 |