Rosenthal Arnon 4

What Happened
Arnon Rosenthal, CEO of Alector, was granted 116,246 restricted stock units (RSUs) on March 13, 2026. The filing reports an acquisition at $0.00 (a compensatory award), not an open-market purchase or sale.

Key Details

• Transaction date: 2026-03-13; transaction type: Award/Grant (code A).
• Shares granted: 116,246 RSUs; reported price: $0.00 (compensatory grant).
• Vesting: 1/2 of the RSUs vest on September 1, 2026; the remaining 1/2 vest on March 1, 2027 (footnote F1).
• Holdings/Trusts: filing notes certain reported securities are held in family trusts for which Rosenthal serves as trustee (footnotes F2–F5).
• Shares owned after the grant: not specified in the provided filing details.
• Filing timeliness: Reported on the same date as the transaction (filed 2026-03-13), indicating a timely Form 4.

Context
RSU grants are a form of executive compensation that vest over time and are not immediate cash buys or sells; they align executive pay with company stock performance but do not, by themselves, signal a market purchase. This was a routine award (compensation), not an exercise/sale or open-market trade.