Arnon Rosenthal - 13 Mar 2026 Form 4 Insider Report for Alector, Inc. (ALEC)

Role
Chief Executive Officer, Director
Signature
/s/ Grace Wong-Sarad, by power of attorney
Issuer symbol
ALEC
Transactions as of
13 Mar 2026
Net transactions value
$0
Form type
4
Filing time
13 Mar 2026, 16:30:10 UTC
Previous filing
03 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Rosenthal Arnon Chief Executive Officer, Director C/O ALECTOR, INC., 131 OYSTER POINT BLVD., SUITE 600, SOUTH SAN FRANCISCO /s/ Grace Wong-Sarad, by power of attorney 13 Mar 2026 0001757770

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ALEC Common Stock Award +116,246 +5% $0.000000* 2,454,422 13 Mar 2026 Direct F1
holding ALEC Common Stock 1,972,875 13 Mar 2026 See footnote F2
holding ALEC Common Stock 652,500 13 Mar 2026 See footnote F3
holding ALEC Common Stock 652,500 13 Mar 2026 See footnote F4
holding ALEC Common Stock 652,500 13 Mar 2026 See footnote F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The reported shares are represented by restricted stock units, or RSUs, one half (1/2) of the total shares shall vest on September 1, 2026 and one half (1/2th) of the total shares shall vest on March 1, 2027.
F2 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.
F3 The reported securities are held directly by the Adi Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.
F4 The reported securities are held directly by the Noam Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.
F5 The reported securities are held directly by the Shani Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.