Keith Crandell - Jun 15, 2022 Form 4 Insider Report for 908 Devices Inc. (MASS)

Role: Director, 10%+ Owner
Signature: /s/ Michael S. Turner, as Attorney-in-Fact
Stock symbol: MASS
Transactions as of: Jun 15, 2022
Transactions value $: $0
Form type: 4
Date filed: 6/17/2022, 04:15 PM
Previous filing: Apr 5, 2022
Next filing: Jul 6, 2022

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		+1.38K			1.38K	Jun 15, 2022	Direct	F1
holding	MASS	Common Stock, par value $0.001						5.73M	Jun 15, 2022	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 Unit	Options Exercise	$0	-1.38K	-100%	$0.00^*	0	Jun 15, 2022	Common Stock, par value $0.001	1.38K		Direct	F1, F3
transaction	MASS	Restricted Stock Unit	Award	$0	+4.77K		$0.00	4.77K	Jun 16, 2022	Common Stock, par value $0.001	4.77K		Direct	F1, F4
transaction	MASS	Stock Option (option to buy)	Award	$0	+7.97K		$0.00	7.97K	Jun 16, 2022	Common Stock, par value $0.001	7.97K	$14.15	Direct	F5

* 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.
F2	The securities are owned directly by ARCH Venture Fund VII, L.P. ("ARCH Fund VII"). The sole general partner of ARCH Fund VII is ARCH Venture Partners VII, L.P. ("ARCH Partners VII"), which may be deemed to be the beneficial owner of the securities held by ARCH Fund VII. The sole general partner of ARCH Partners VII is ARCH Venture Partners VII, LLC ("ARCH VII LLC"), which may be deemed to be the beneficial owner of the securities held by ARCH Fund VII. The reporting person is a managing director of ARCH VII LLC, and may be deemed to beneficially own the securities held by ARCH Fund VII. The reporting person disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.
F3	The RSUs became fully vested on June 15, 2022, the day prior to the 2022 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.
F4	The RSUs become fully vested on June 16, 2023 or the day prior to the 2023 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.
F5	The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following June 16, 2022, subject to the reporting person's continued service through the applicable vesting date.