Form 4 Filing for 908 Devices Inc.

On September 23, 2026, AWM Investment Company, Inc., a significant owner (10% beneficial owner), reported a disposition of 1,000 shares of Common Stock in 908 Devices Inc. at a price of $11.25 per share. Following this transaction, the company held 4,755,773 shares. The next day, September 24, 2026, AWM Investment Company, Inc. reported another disposition of 24,000 shares of Common Stock, with a weighted average price of $11.3594 per share. Post this transaction, the total shares held amounted to 4,754,773. These transactions were executed indirectly through limited partnerships, with AWM acting as the investment adviser. David M. Greenhouse and Adam C. Stettner are identified as the controlling principals of AWM. The filing is made by Adam Stettner on behalf of AWM.