Transaction · 0001193125-26-361376

Rosenthal Arnon

Rosenthal Arnon, CEO, reported a transaction classified as gift at Alector, Inc. involving 350000.000000 shares for an estimated $0.00. Reported holdings after the transaction were 1002500.000000 shares. A 10b5-1 reference was not detected in the stored filing text.

giftSEC transaction code GCEO
ALECAlector, Inc.
Filing timeAug 21
Trade dateAug 19, 2026
Filing · SECView on SEC
InsiderProfile

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$2.36
Pre-filing
1mo ago -39.4%1w ago -8.9%1d ago -6.4%
Returns since
7d -0.8%30d -0.8%90d -0.8%180d -0.8%1y -0.8%

ALEC price since this filing

30 days of pre-filing context and vertical markers at the filing date plus 7d / 30d / 90d / 180d / 1y afterwards
ALEC since 2026-08-21Filed 15 days ago · 30 days of pre-filing context shaded
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Filing datePost-filing windows (7d, 30d, 90d, 180d, 1y)30 days of pre-filing context

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
gift
Code G
Identifier
0001193125-26-361376
Common Stock
Transaction date
Aug 19, 2026
Filed Aug 21, 2026, 10:00 PM · 2d delay
Shares
350k sh
$0 per share
Estimated value
$0
Computed from shares × price
Holdings after
1.00M sh
Indirect · See footnote

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $10.0MLarge $100M
Large Holdings Increase
-12score
Filing-only score

-12

Compact filing score computed from stored Form 4 facts. Version v1.

Mixed or weak signal

This filing has a negative filing-only score. It may be less informative as an insider-activity signal and needs extra context.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

Chief Executive Officer

Officer YesDirector Yes10% NoOther No
Footnotes & amended
  1. F1

    The reported securities are held directly by The Rosenthal Family Revocable Trust Dated November 4, 1994, as restated on June 9, 1999, for which the Reporting Person serves as trustee.

  2. F2

    The reported securities are held directly by the Adi Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.

  3. F3

    The reported securities are held directly by the Noam Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.

  4. F4

    The reported securities are held directly by the Shani Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.

Original filing · 0001193125-26-361376
Related transactions

0 other filings

Same reporting owner
Recent company activity

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