Rosenthal Arnon 4
4 · Alector, Inc. · Filed Mar 3, 2026
Research Summary
AI-generated summary of this filing
Alector (ALEC) CEO Arnon Rosenthal Sells 81,864 Shares
What Happened
Arnon Rosenthal, CEO of Alector, sold 81,864 shares (reported as a sale) on 2026-03-02 for a total of approximately $173,822. The transaction was a disposition (S) and the proceeds were used to satisfy tax withholding related to the vesting of restricted stock units (RSUs).
Key Details
- Transaction date: 2026-03-02; Form filed: 2026-03-03 (filed next day).
- Price: weighted average $2.12 per share; actual sale prices ranged from $2.04 to $2.37 across multiple trades.
- Total value reported: $173,822.
- Reason given (footnote): shares sold to satisfy tax obligations in connection with RSU vesting (tax withholding).
- Holdings after transaction: not specified in the provided filing.
- Reported holdings are held in family/trust vehicles for which Rosenthal serves as trustee (see F3–F6).
- Transaction type code: S = Sale.
Context
This was a routine sale to cover taxes on vested RSUs rather than an open-market purchase or a new grant. Such tax-related dispositions are common and do not by themselves indicate a change in insider sentiment about the company.
Insider Transaction Report
Form 4
Alector, Inc.ALEC
Rosenthal Arnon
DirectorChief Executive Officer
Transactions
- Sale
Common Stock
[F1][F2]2026-03-02$2.12/sh−81,864$173,822→ 2,338,176 total
Holdings
- 1,972,875(indirect: See footnote)
Common Stock
[F3] - 652,500(indirect: See footnote)
Common Stock
[F4] - 652,500(indirect: See footnote)
Common Stock
[F5] - 652,500(indirect: See footnote)
Common Stock
[F6]
Footnotes (6)
- [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.
- [F2]The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $2.04 to $2.37. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff, the issuer, or any security holder of the issuer upon request.
- [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.
- [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.
- [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.
- [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.
Signature
/s/ Grace Wong-Sarad, by power of attorney|2026-03-03