X0508 4 2025-03-03 false 0001555279 908 Devices Inc. MASS 0001431531 Griffith Joseph H. IV C/O 908 DEVICES INC. 645 SUMMER STREET BOSTON MA 02210 false true false false Chief Financial Officer false Stock Option (option to buy) 1.98 2025-03-03 4 A false 59362.00 0.00 A 2034-03-02 Common Stock, par value $0.001 59362.00 59362.00 D Restricted Stock Units 2025-03-03 4 A false 130418.00 0.00 A Common Stock, par value $0.001 130418.00 130418.00 D One-third of the shares underlying the option become vested and exercisable on February 1, 2026, and the remaining two-thirds of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 24 months following February 1, 2026, subject to the reporting person's continued service through the applicable vesting date. Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested. The RSUs shall vest one-third on February 1, 2026, with the remaining two-thirds vesting in two substantially equal annual installments at the two anniversary dates following February 1, 2026, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date. /s/ Michael S. Turner, as Attorney-in-Fact 2025-03-05