Form 4 Filing for 908 Devices Inc.

This filing details a series of stock transactions by AWM Investment Company, Inc., a significant owner of 908 Devices Inc. (MASS). On June 22, 2026, AWM Investment Company, Inc. disposed of 4,668 shares of Common Stock at an average price of $8.99 per share, resulting in a post-transaction ownership of 4,882,823 shares. This was followed by another disposition of 3,050 shares on June 23, 2026, at an average price of $9.0041 per share, leaving AWM with 4,879,773 shares. The filing clarifies that AWM acts as the investment adviser to several funds and holds voting and investment power over these shares. It also states that controlling principals David M. Greenhouse and Adam C. Stettner disclaim beneficial ownership beyond their pecuniary interest.