X0508 4 2025-06-11 false 0001555279 908 Devices Inc. MASS 0001836585 Spoto Mark C/O 908 DEVICES INC. 645 SUMMER STREET BOSTON MA 02210 true false false false false Common Stock 2025-06-11 4 M false 11364.00 A 74335.00 D Common Stock 3599.00 I See Footnote Restricted Stock Units 2025-06-11 4 M false 11364.00 0.00 D Common Stock 11364.00 0.00 D Restricted Stock Units 2025-06-12 4 A false 14083.00 0.00 A Common Stock 14083.00 14083.00 D Stock Option (option to buy) 7.19 2025-06-12 4 A false 6516.00 0.00 A 2035-06-11 Common Stock 6516.00 6516.00 D Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date. These securities are owned directly by Razor's Edge Ventures, LLC. The reporting person is a managing member of Razor's Edge Ventures, LLC and may be deemed to be the beneficial owner of the securities held by Razor's Edge Ventures, LLC. The reporting person disclaims beneficial ownership of the securities held by Razor's Edge Ventures, LLC except to the extent of his pecuniary interest therein. The RSUs became fully vested on June 11, 2025, the day prior to the 2025 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration 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 fully vested on June 12, 2026 or the day prior to the 2026 Annual Meeting of the Stockholders of 908 Devices Inc., whichever occurs first, 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. The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following June 12, 2025, subject to the reporting person's continued service through the applicable vesting date. /s/ Michael S. Turner, as Attorney-in-Fact 2025-06-13