ALNYLAM PHARMACEUTICALS, INC. - Form 3 Filing

This filing details the initial ownership of securities by Melissa McLaughlin, Chief Human Resources Officer of ALNYLAM PHARMACEUTICALS, INC. As of March 25, 2026, McLaughlin directly holds 13,353 shares of common stock. This includes 11,730 shares from restricted stock units (RSUs) granted on April 1, 2025, and 1,623 shares from RSUs granted on March 2, 2026. These RSUs are subject to a three-year vesting schedule. Additionally, McLaughlin holds a stock option, granted on March 2, 2026, with an exercise price of $325.07, which allows her to purchase 3,567 shares of common stock. The stock option vests over four years, with 25% vesting on the first anniversary of the grant date and the remainder vesting quarterly thereafter. The filing was signed on April 7, 2026.