Annexon Director Mark S. Blumenkranz Receives 175,000-Share Award

What Happened
Mark S. Blumenkranz, a director of Annexon, Inc. (ANNX), received a derivative equity award of 175,000 shares on August 10, 2026. The filing reports an acquisition price of $0.00 (no cash paid at grant). This is an award (grant) rather than a market purchase or sale.

Key Details

• Transaction date: August 10, 2026; filing date: August 12, 2026 (appears timely).
• Award: 175,000 shares reported as a derivative security, price $0.00, total immediate value reported $0.
• Vesting: 1/36th of the shares vest on each monthly anniversary beginning August 10, 2026; 100% vests on the third anniversary, subject to Blumenkranz’s continuous service. (Footnote provided in filing.)
• Shares owned after the transaction: not specified in the Form 4 filing.
• Transaction code: A = Award/Grant.

Context
This was a grant of a derivative equity award (common for director compensation). Because the award vests over three years and was granted at $0.00, there was no immediate cash outlay or sale of shares; value is realized only as shares vest and, if applicable, are exercised or settled. Such awards are routine compensation and do not by themselves signal a buy/sell decision.