SEC Form 4 · accession 0001193125-26-361376
Alector, Inc. · ALEC
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Arnon Rosenthal
Officer — Chief Executive Officer · Director
Period of report
Aug 19, 2026
Accepted (ET)
Aug 21, 2026 · 6:00 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0001653087
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common StockF1 | Aug 19, 2026 | G | 1,050,000 | $0.00 | D | 922,875 | I | See footnote |
| Common StockF2 | Aug 19, 2026 | G | 350,000 | $0.00 | A | 1,002,500 | I | See footnote |
| Common StockF3 | Aug 19, 2026 | G | 350,000 | $0.00 | A | 1,002,500 | I | See footnote |
| Common StockF4 | Aug 19, 2026 | G | 350,000 | $0.00 | A | 1,002,500 | I | See footnote |
| Common Stock | holding | — | — | — | 2,367,206 | D |
Table II — derivative securities
No Table II lines on this filing.
Explanation of responses
- F1The 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.
- F2The reported securities are held directly by the Adi Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.
- F3The reported securities are held directly by the Noam Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.
- F4The reported securities are held directly by the Shani Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.