Form 4 Filing for Eloi Fenel M.

Eloi Fenel M., a director at 908 Devices Inc., reported several transactions on June 10-11, 2026. These include the disposition of 14,083 Restricted Stock Units (RSUs) and the acquisition of 13,656 RSUs. Additionally, 6,209 stock options were acquired. The RSUs represent contingent rights to receive common stock upon vesting. Footnotes indicate that the disposed RSUs vested on June 10, 2026, while the acquired RSUs and stock options have staggered vesting schedules tied to continued service and the company's annual meetings, with no expiration dates mentioned for the RSUs. The stock option has an exercise price of $8.22 and an expiration date of June 10, 2036. The filing also includes a Power of Attorney document, authorizing specific individuals to execute SEC filings on behalf of the reporting person.