X0508 4 2024-02-01 false 0001555279 908 Devices Inc. MASS 0001836988 Brown Christopher D. C/O 908 DEVICES INC. 645 SUMMER STREET BOSTON MA 02210 false true false false Chief Product Officer false Common Stock 2024-02-01 4 M false 5028.00 A 882933.00 D Common Stock 2024-02-01 4 M false 7418.00 A 890351.00 D Common Stock 2024-02-01 4 S false 1599.00 6.9926 D 888752.00 D Common Stock 2024-02-01 4 S false 2358.00 7.0183 D 886394.00 D Restricted Stock Units 2024-02-01 4 M false 5028.00 0.00 D Common Stock 5028.00 10054.00 D Restricted Stock Units 2024-02-01 4 M false 7418.00 0.00 D Common Stock 7418.00 22254.00 D Each Restricted Stock Unit ("RSU") represents a contingent right to receive, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date. The sale reported on this Form 4 represents shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of RSUs. The sale is mandated by the Issuer's election to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary transaction 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 $6.93 to $7.08, 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 $6.95 to $7.10, 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. These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2022, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date. These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2023, 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 2024-02-02