Michael S. Turner - 03 Mar 2025 Form 4 Insider Report for 908 Devices Inc. (MASS)

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	MASS	Stock Option (option to buy)	Award	$0	+57,111		$0.000000	57,111	03 Mar 2025	Common Stock, par value $0.001	57,111	$1.98	Direct	F1
transaction	MASS	Restricted Stock Units	Award	$0	+125,470		$0.000000	125,470	03 Mar 2025	Common Stock, par value $0.001	125,470		Direct	F2, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Id	Content
F1	One-third of the shares underlying the option become vested and exercisable on February 1, 2026, and the remaining two-thirds of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 24 months following February 1, 2026, subject to the reporting person's continued service through the applicable vesting date.
F2	Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.
F3	The RSUs shall vest one-third on February 1, 2026, with the remaining two-thirds vesting in two substantially equal annual installments at the two anniversary dates following February 1, 2026, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.