Officer and Director Transactions

On July 6, 2026, Pangali Sanam, Chief Legal Officer of ALUMIS INC., acquired 5,000 shares of Common Stock at a price of $5.06 per share. The same day, Sanam disposed of 5,000 shares of Common Stock at a price of $28.0 per share. Additionally, Sanam exercised a stock option to buy 5,000 shares of Common Stock at a conversion price of $5.06 per share. Following these transactions, Sanam directly owns 11,111 shares of Common Stock and has options for 36,000 shares of Common Stock. The stock option vests over 36 months, with 25% vesting on February 18, 2026, and the remainder vesting monthly thereafter. The option expires on February 17, 2035.