908 Devices Inc. Director Christopher D. Brown Sells 9,900 Shares Under Rule 10b5-1 Plan

Christopher D. Brown, a director of 908 Devices Inc. (MASS), sold 9,900 shares of common stock on June 23, 2026, at a weighted average price of $9.04 per share. The shares were sold pursuant to a Rule 10b5-1 trading plan adopted on November 24, 2025. The sales occurred in multiple transactions with prices ranging from $9.00 to $9.08. Following the transaction, Brown's remaining ownership stands at 865,559 shares. The filing indicates the transaction was made through a pre-established trading plan, which allows insiders to sell shares on a predetermined schedule to avoid concerns about trading on non-public information. The filing was signed by attorney-in-fact Mark S. Levine on behalf of the director.