X0306 4 2022-11-21 false 0001555279 908 Devices Inc. MASS 0001252546 HRUSOVSKY E KEVIN C/O 908 DEVICES INC. 645 SUMMER STREET BOSTON MA 02210 true false false false Common Stock, par value $0.001 2022-11-21 4 M false 76016.00 0.35 A 320571.00 D Common Stock, par value $0.001 136499.00 I See Footnote Stock Option (option to buy) 0.35 2022-11-21 4 M false 76016.00 0.00 D 2023-02-17 Common Stock, par value $0.001 76016.00 0.00 D The securities are owned directly by the E. Kevin Hrusovsky 2012 Irrevocable Trust. The reporting person's spouse and children are trustees of E. Kevin Hrusovsky 2012 Irrevocable Trust and have joint voting and dispositive control with respect to all securities held by E. Kevin Hrusovsky 2012 Irrevocable Trust and the reporting person may be deemed to be the beneficial owner of the securities held by E. Kevin Hrusovsky 2012 Irrevocable Trust. The shares underlying the option are fully vested and immediately exercisable. /s/ Michael S. Turner, as Attorney-in-Fact 2022-11-22