Director Michele Leonhart Receives 6,486 Shares from RSU Vesting at 908 Devices

This Form 4 filing reports that Michele M. Leonhart, a director of 908 Devices Inc. (MASS), received 6,486 shares of common stock on June 25, 2026, through the vesting of Restricted Stock Units (RSUs). The RSUs were granted as part of a compensation plan and represent a contingent right to receive one share of common stock each upon vesting. The RSUs vest in substantially equal annual installments over three years following June 25, 2024, subject to continued service. Following this transaction, Leonhart's direct holdings increased to 27,054 shares of common stock, while she retains 6,485 unvested RSUs. The transaction was reported by Mark S. Levine as Attorney-in-Fact for the director.