X0508 4 2024-03-01 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) 7.35 2024-03-01 4 A false 61535.00 0.00 A 2034-02-28 Common Stock, par value $0.001 61535.00 61535.00 D Restricted Stock Units 2024-03-01 4 A false 45042.00 0.00 A Common Stock, par value $0.001 45042.00 45042.00 D Twenty-five percent of the shares underlying the option become vested and exercisable on February 1, 2025, and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following February 1, 2025, 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 25% on February 1, 2025, with the remaining 75% vesting in three substantially equal annual installments at the three anniversary dates following February 1, 2025, 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 2024-03-05