Keith Crandell - Jun 14, 2023 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 14, 2023
Transactions value $: $0
Form type: 4
Date filed: 6/16/2023, 05:52 PM
Previous filing: Apr 4, 2023
Next filing: Aug 10, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MASS	Common Stock	Options Exercise		+4.77K	+345.98%		6.15K	Jun 14, 2023	Direct	F1
holding	MASS	Common Stock						5.73M	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 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 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.