Trent A. Basarsky - Jul 12, 2021 Form 4 Insider Report for 908 Devices Inc. (MASS)

Role: VP, Corporate Development
Signature: /s/ Michael S. Turner, as Attorney-in-Fact
Stock symbol: MASS
Transactions as of: Jul 12, 2021
Transactions value $: $52,500
Form type: 4
Date filed: 7/14/2021, 05:16 PM
Previous filing: Jul 23, 2021
Next filing: Jul 27, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MASS	Common Stock, par value $0.001	Options Exercise	$52.5K	+30K	+600%	$1.75^*	35K	Jul 12, 2021	Direct

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)	Options Exercise	$0	-30K	-17.19%	$0.00	145K	Jul 12, 2021	Common Stock, par value $0.001	175K	$1.75	Direct	F1

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

Explanation of Responses:

Id	Content
F1	Twenty-five percent of the shares underlying the option became vested and exercisable on January 8, 2018 and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following January 8, 2018, subject to the reporting person's continued service through the applicable vesting date.