X0306 4 2022-03-14 false 0001555279 908 Devices Inc. MASS 0001608021 Basarsky Trent A. C/O 908 DEVICES INC. 645 SUMMER STREET BOSTON MA 02210 false true false false VP, Corporate Development Common Stock, par value $0.001 2022-03-14 4 M false 12695.00 1.75 A 72695.00 D Common Stock, par value $0.001 2022-03-14 4 M false 2305.00 3.24 A 75000.00 D Common Stock, par value $0.001 2022-03-14 4 S false 8237.00 17.19 D 66763.00 D Common Stock, par value $0.001 2022-03-14 4 S false 6763.00 18.23 D 60000.00 D Stock Option (option to buy) 1.75 2022-03-14 4 M false 12695.00 0.00 D 2027-04-26 Common Stock, par value $0.001 36136.00 23441.00 D Stock Option (option to buy) 3.24 2022-03-14 4 M false 2305.00 0.00 D 2030-09-14 Common Stock, par value $0.001 36875.00 34570.00 D Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.93 to $17.71,inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.93 to $18.67,inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. The shares underlying the option are fully vested and immediately exercisable. The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 48 months following September 11, 2020, subject to the reporting person's continued service through the applicable vesting date. /s/ Michael S. Turner, as Attorney-in-Fact 2022-03-15