X0609 4 2026-05-08 0001555279 908 Devices Inc. MASS 0001836876 Kenneweg John false C/O 908 DEVICES INC. 44 3RD AVENUE BURLINGTON MA 01803 false true false false SVP, Sales & Product Marketing 0 Common Stock 2026-05-08 4 S 0 18255 8.11 D 57784 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.99 to $8.20 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, 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 range set forth in this footnote. /s/ Mark S. Levine, Attorney-in-Fact 2026-05-11