X0306 4 2022-03-02 false 0001555279 908 Devices Inc. MASS 0001606030 Hunt Anthony C/O 908 DEVICES INC. 645 SUMMER STREET BOSTON MA 02210 true false false false Stock Option (option to buy) 16.20 2022-03-02 4 A false 6173.00 0.00 A 2032-03-02 Common Stock, par value $0.001 6173.00 6173.00 D Restricted Stock Unit 2022-03-02 4 A false 10362.00 0.00 A Common Stock, par value $0.001 10362.00 10362.00 D The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following March 2, 2022, 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 become vested in substantially equal annual installments over the 3 years following March 2, 2022, subject to the reporting person's continued service through the applicable vesting date, provided that, if the reporting person terminates their service for any reason, then a prorated number of RSUs will vest. The RSUs have no expiration date. /s/ Michael S. Turner, as Attorney-in-Fact 2022-03-04