James B. Tananbaum's Pro Rata Distributions of Alumis Common Stock

This Form 4 filing reports pro rata, in-kind distributions of Alumis Inc. (ALMS) common stock by James B. Tananbaum, a director and 10% owner, through various investment entities on April 1, 2026. The transactions involve distributions from Foresite Labs Affiliates 2021, LLC to its members, including Foresite Labs, LLC, which then distributed shares to TFL Investment Holdings, LLC. All transactions were executed at $0 per share as they represent pro rata distributions rather than purchases or sales. Tananbaum maintains indirect beneficial ownership through multiple Foresite Capital entities, including Fund V, Opportunity Fund V, Fund VI, Labs Co-Invest V, and Labs Fund I, with total holdings ranging from 194,459 to 5,702,536 shares across these entities. The filing notes this is one of three Form 4s filed on the same date regarding these transactions.