John Kenneweg - Jun 16, 2021 Form 4 Insider Report for 908 Devices Inc. (MASS)

Role: Vice President, Government
Signature: /s/ Michael S. Turner, as Attorney-in-Fact
Stock symbol: MASS
Transactions as of: Jun 16, 2021
Transactions value $: -$389,200
Form type: 4
Date filed: 6/21/2021, 08:05 AM
Next filing: Jul 20, 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	$3.5K	+10K		$0.35^*	10K	Jun 16, 2021	Direct
transaction	MASS	Common Stock, par value $0.001	Sale	-$393K	-10K	-100%	$39.27^*	0	Jun 16, 2021	Direct	F1

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	-10K	-6.53%	$0.00	143K	Jun 16, 2021	Common Stock, par value $0.001	153K	$0.35	Direct	F2

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

Explanation of Responses:

Id	Content
F1	Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
F2	The shares underlying the option are fully vested and immediately exercisable.