ROSENTHAL ARNON

PrivateCIK: 1757770
Location

SOUTH SAN FRANCISCO, CA

ROSENTHAL ARNON (Chief Executive Officer) sold 4.1% of their position (104.35K shares) of ALECTOR, INC. on the open market

Open‑market sale worth $116.8K — a minor trim. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale
InsiderROSENTHAL ARNONCIK 1757770
IssuerALECTOR, INC.CIK 1653087
DirectorOfficer· Chief Executive Officer
Since Feb 2019
-104.35K
Net shares
Net seller
$116.8K
Total sold
1
Open market trades
0B · 1S
1
Total transactions
104.35K disposed
Non-Derivative Transactions1

Common Stock

Direct
S · Sale

Shares

104.35K

Price / share

$1.12

Trade value

$116.83K

% of position

4.1%
12/3/2025
2.52M2.42M
Total

Net shares

104.35K

Net value

-$116.83K

Derivative Transactions0
No derivative transactions reported
Non-Derivative Holdings (Post-Transaction)4

Common Stock

Indirect
Shares owned652.50K

Common Stock

Indirect
Shares owned652.50K

Common Stock

Indirect
Shares owned652.50K

Common Stock

Indirect
Shares owned1.97M
Total
3.93M indirect3.93M
Derivative Holdings (Post-Transaction)0
No derivative holdings reported
ROSENTHAL ARNON — Insider Transaction (Form 4) Filed Dec 3, 2025 | Finecho