Arnon Rosenthal owns 5.77% of Alector
6,442,475 shares as of the October 14, 2026 filing, worth $11.9M at the latest close.
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Free.
The stake
5.77%
worth $11.9M at the latest close
Stake rank
#1,599
by dollar value of the stake
Last sale
46 days ago
Sep 3, 2026
Last buy
None
no purchases since 2021
Arnon Rosenthal owns 5.77% of Alector, Inc.: 6,442,475 of 111,656,919 shares, worth about $11.9M at the 2026-10-16 close. The stake has moved from 8.79% in 2019 to 5.77% on 2026-10-14, across 21 sales and 0 purchases that moved it since 2016. The last trade that moved it was a discretionary sale of $193,473 on 2026-09-03.
How the stake is held
as of the Oct 14, 2026 filing
SHARES
OF THE STAKE
COMMON STOCK · stated Oct 14, 2026 · Form 4 ↗
HELD DIRECTLY
2,512,100
39.0%
HELD INDIRECTLY · 4 VEHICLES
3,930,375
61.0%
Indirect holding
1,002,500
15.6%
Indirect holding
1,002,500
15.6%
Indirect holding
1,002,500
15.6%
Indirect, per the filing’s footnote
922,875
14.3%
THE STAKE
6,442,475
5.77%