Form 4 Filing for 908 Devices Inc.

Christopher D. Brown, a director at 908 Devices Inc. (MASS), reported the sale of 30,000 shares of Common Stock on September 2, 2026. The sale was executed as part of a Rule 10b5-1 trading plan adopted on November 24, 2025. The shares were sold at a weighted average price of $10.58 per share, with individual sales ranging from $10.33 to $10.97. Following this transaction, Mr. Brown holds 775,559 shares of Common Stock. The filing was signed by Mark S. Levine as Attorney-in-Fact on September 4, 2026.