Form 4 Filing for 908 Devices Inc. - Officer Transaction

Kevin J. McCallion, SVP of Products and Production at 908 Devices Inc. (MASS), reported a series of transactions on April 10, 2026. McCallion exercised a stock option, acquiring 2,693 shares of common stock at a conversion price of $1.05 per share. This option was granted under a Rule 10b5-1 trading plan. Following the exercise, the option grant was fully satisfied, though a prior scrivener's error had understated the total options beneficially owned. Concurrently, McCallion sold 2,693 shares of common stock. The sale was executed at a weighted average price of $7.01, with individual sales occurring between $7.00 and $7.03 per share. These sales were also made pursuant to the Rule 10b5-1 trading plan. Post-transaction, McCallion holds 44,925 shares of common stock directly. The filing also noted a previous understatement of options owned due to a scrivener's error.