E. Kevin Hrusovsky - Jun 14, 2023 Form 4 Insider Report for 908 Devices Inc. (MASS)

Role: Director
Signature: /s/ Michael S. Turner, as Attorney-in-Fact
Stock symbol: MASS
Transactions as of: Jun 14, 2023
Transactions value $: $0
Form type: 4
Date filed: 6/16/2023, 05:51 PM
Previous filing: Feb 14, 2023
Next filing: Jun 14, 2024

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MASS	Common Stock	Options Exercise		+4.77K	+3.75%		132K	Jun 14, 2023	Direct	F1
holding	MASS	Common Stock						330K	Jun 14, 2023	See Footnote	F2

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	Restricted Stock Units	Options Exercise	$0	-4.77K	-100%	$0.00^*	0	Jun 14, 2023	Common Stock	4.77K		Direct	F1, F3
transaction	MASS	Restricted Stock Units	Award	$0	+7.78K		$0.00	7.78K	Jun 15, 2023	Common Stock	7.78K		Direct	F4, F5
transaction	MASS	Stock Option (option to buy)	Award	$0	+12.1K		$0.00	12.1K	Jun 15, 2023	Common Stock	12.1K	$8.68	Direct	F6

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

Explanation of Responses:

Id	Content
F1	Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.
F2	The securities are owned directly by the E. Kevin Hrusovsky 2012 Irrevocable Trust. The reporting person's spouse and children are trustees of E. Kevin Hrusovsky 2012 Irrevocable Trust and have joint voting and dispositive control with respect to all securities held by E. Kevin Hrusovsky 2012 Irrevocable Trust and the reporting person may be deemed to be the beneficial owner of the securities held by E. Kevin Hrusovsky 2012 Irrevocable Trust.
F3	The RSUs became fully vested on June 14, 2023, the day prior to the 2023 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.
F4	Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.
F5	The RSUs become fully vested on June 15, 2024 or the day prior to the 2024 Annual Meeting of the Stockholders of 908 Devices Inc., whichever occurs first, subject to the reporting person's continued service through the applicable vesting date, provided that, if the reporting person terminates their service for any reason, then a prorated number of RSUs will vest. The RSUs have no expiration date.
F6	The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following June 15, 2023, subject to the reporting person's continued service through the applicable vesting date.