Trent A. Basarsky - 07 Dec 2021 Form 4 Insider Report for 908 Devices Inc. (MASS)

Role: VP, Corporate Development
Signature: /s/ Michael S. Turner, as Attorney-in-Fact
Issuer symbol: MASS
Transactions as of: 07 Dec 2021
Net transactions value: +$17,500
Form type: 4
Filing time: 09 Dec 2021, 16:04:31 UTC
Previous filing: 27 Sep 2021
Next filing: 14 Jan 2022
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	$17,500	+10,000	+29%	$1.75^*	45,000	07 Dec 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	-10,000	-12%	$0.000000	75,779	07 Dec 2021	Common Stock, par value $0.001	85,779	$1.75	Direct	F1, F2

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

Explanation of Responses:

Id	Content
F1	The shares underlying the option are fully vested and immediately exercisable.
F2	On September 27, 2021, the reporting person filed a Form 4/A which inadvertently understated the remaining number of options available for exercise under this stock option by 7,275 shares. This Form 4 corrects the error caused by such understatement in Column 9 of Table II by increasing the total amount of derivative securities subject to this stock option by such 7,275 shares.