Rosenthal Arnon 4

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.