X0306 4 2021-08-23 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 2021-08-23 4 M false 3000.00 1.75 A 38000.00 D Common Stock 2021-08-23 4 M false 1700.00 1.75 A 39700.00 D Common Stock 2021-08-23 4 M false 6000.00 1.75 A 45700.00 D Common Stock 2021-08-23 4 M false 2619.00 1.75 A 48319.00 D Common Stock 2021-08-23 4 M false 12000.00 1.75 A 60319.00 D Common Stock 2021-08-23 4 S false 9884.00 33.16 D 50435.00 D Common Stock 2021-08-23 4 S false 3300.00 34.20 D 47135.00 D Common Stock 2021-08-23 4 S false 12135.00 34.86 D 35000.00 D Common Stock 2021-08-24 4 M false 3817.00 1.75 A 38817.00 D Common Stock 2021-08-24 4 M false 6261.00 1.75 A 45078.00 D Common Stock 2021-08-24 4 S false 10078.00 34.95 D 35000.00 D Common Stock 2021-08-25 4 M false 700.00 1.75 A 35700.00 D Common Stock 2021-08-25 4 M false 900.00 1.75 A 36600.00 D Common Stock 2021-08-25 4 S false 1600.00 34.95 D 35000.00 D Stock Option (Right to Buy) 1.75 2021-08-23 4 M false 3000.00 0.00 D 2027-04-26 Common Stock 123504.00 120504.00 D Stock Option (Right to Buy) 1.75 2021-08-23 4 M false 1700.00 0.00 D 2027-04-26 Common Stock 120504.00 118804.00 D Stock Option (Right to Buy) 1.75 2021-08-23 4 M false 6000.00 0.00 D 2027-04-26 Common Stock 118804.00 112804.00 D Stock Option (Right to Buy) 1.75 2021-08-23 4 M false 2619.00 0.00 D 2027-04-26 Common Stock 112804.00 110185.00 D Stock Option (Right to Buy) 1.75 2021-08-23 4 M false 12000.00 0.00 D 2027-04-26 Common Stock 110185.00 98185.00 D Stock Option (Right to Buy) 1.75 2021-08-24 4 M false 3817.00 0.00 D 2027-04-26 Common Stock 98185.00 94368.00 D Stock Option (Right to Buy) 1.75 2021-08-24 4 M false 6261.00 0.00 D 2027-04-26 Common Stock 94368.00 88107.00 D Stock Option (Right to Buy) 1.75 2021-08-25 4 M false 700.00 0.00 D 2027-04-26 Common Stock 88107.00 87407.00 D Stock Option (Right to Buy) 1.75 2021-08-25 4 M false 900.00 0.00 D 2027-04-26 Common Stock 87407.00 86507.00 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 $32.69 to $33.59, 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 $33.69 to $34.68, 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 $34.69 to $35.00, 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 $34.90 to $35.08, 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 $34.90 to $35.01, 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. Twenty-five percent of the shares underlying the option became vested and exercisable on January 8, 2018 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following January 8, 2018, subject to the reporting person's continued service through the applicable vesting date. /s/ Michael S. Turner, as Attorney-in-Fact 2021-08-25