Transaction · 0001193125-26-383857

Rosenthal Arnon

Rosenthal Arnon, CEO, reported an open-market or private sale at Alector, Inc. involving 72606.000000 shares for an estimated $193473.21. Reported holdings after the transaction were 2294600.000000 shares. A 10b5-1 reference was not detected in the stored filing text.

Open-market sellSEC transaction code SCEO
ALECAlector, Inc.
Filing timeSep 04
Trade dateSep 03, 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
$2.46
Pre-filing
1mo ago -37.4%1w ago -2.8%1d ago +10.6%
Returns since
7d +0.0%30d +0.0%90d +0.0%180d +0.0%1y +0.0%

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 2026-09-04Filed yesterday · 1 day of post-filing data
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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
Sell
Code S
Identifier
0001193125-26-383857
Common Stock
Transaction date
Sep 03, 2026
Filed Sep 04, 2026, 09:45 PM · 1d delay
Shares
72.6k sh
$266 per share
Estimated value
-$19.3M
Computed from shares × price
Holdings after
2.29M sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $10.0MLarge $100M
Cluster Selling Direct Ownership
+10score
Filing-only score

+10

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

Positive filing signal

This filing has a modest positive filing-only score. Treat it as a useful flag for review, not as a buy signal.

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 shares were sold to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units, or RSUs.

  2. F2

    The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $2.49 to $2.75. Full information regarding the number of shares sold at…

  3. F3

    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.

  4. F4

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

  5. F5

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

  6. F6

    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 · 0001193125-26-383857
Related transactions

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