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

Role: Vice President, Government
Signature: /s/ Michael S. Turner, as Attorney-in-Fact
Issuer symbol: MASS
Transactions as of: 16 Jun 2021
Net transactions value: -$389,200
Form type: 4
Filing time: 21 Jun 2021, 08:05:22 UTC
Next filing: 20 Jul 2021
SEC: View on sec.gov

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	$3,500	+10,000		$0.3500^*	10,000	16 Jun 2021	Direct
transaction	MASS	Common Stock, par value $0.001	Sale	$392,700	-10,000	-100%	$39.27^*	0	16 Jun 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	-10,000	-6.5%	$0.000000	143,033	16 Jun 2021	Common Stock, par value $0.001	153,033	$0.3500	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.