908 Devices Inc.

Except as set forth below, none of our directors or executive officers adopted or terminated a Rule 10b5-1 trading arrangement or a non-Rule 10b5-1 trading arrangement during the quarter ended June 30, 2025, as such terms are defined under Item 408(a) of Regulation S-K.

On May 19, 2025, Kevin J. Knopp, Ph.D., the Company’s Chief Executive Officer, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities. Dr. Knopp’s trading plan provides for the potential sale of up to 240,000 shares of the Company’s common stock. The trading plan will expire on the earlier of November 16, 2026 and the date when all shares under the trading plan are sold.

On June 2, 2025, Joseph H. Griffith IV, the Company’s Chief Financial Officer, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities. Mr. Griffith’s trading plan provides for the potential sale of up to 26,940 shares of the Company’s common stock, less any shares sold pursuant to his pre-existing trading plan which expires on August 10, 2025. The potential shares to be sold also includes an indeterminate number of shares received upon the vesting of restricted stock units during the period covered by the trading plan, net of any shares withheld to satisfy tax withholding obligations. The trading plan will expire on the earlier of August 10, 2026 and the date when all shares under the trading plan are sold.