Mark Spoto - 11 Jun 2025 Form 4 Insider Report for 908 Devices Inc. (MASS)

Role: Director
Signature: /s/ Michael S. Turner, as Attorney-in-Fact
Issuer symbol: MASS
Transactions as of: 11 Jun 2025
Net transactions value: $0
Form type: 4
Filing time: 13 Jun 2025, 16:18:07 UTC
Previous filing: 15 May 2025
Next filing: 03 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Spoto Mark	Director	C/O 908 DEVICES INC., 645 SUMMER STREET, BOSTON	/s/ Michael S. Turner, as Attorney-in-Fact	13 Jun 2025	0001836585

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MASS	Common Stock	Options Exercise		+11,364	+18%		74,335	11 Jun 2025	Direct	F1
holding	MASS	Common Stock						3,599	11 Jun 2025	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	-11,364	-100%	$0.000000	0	11 Jun 2025	Common Stock	11,364		Direct	F1, F3
transaction	MASS	Restricted Stock Units	Award	$0	+14,083		$0.000000	14,083	12 Jun 2025	Common Stock	14,083		Direct	F4, F5
transaction	MASS	Stock Option (option to buy)	Award	$0	+6,516		$0.000000	6,516	12 Jun 2025	Common Stock	6,516	$7.19	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	These securities are owned directly by Razor's Edge Ventures, LLC. The reporting person is a managing member of Razor's Edge Ventures, LLC and may be deemed to be the beneficial owner of the securities held by Razor's Edge Ventures, LLC. The reporting person disclaims beneficial ownership of the securities held by Razor's Edge Ventures, LLC except to the extent of his pecuniary interest therein.
F3	The RSUs became fully vested on June 11, 2025, the day prior to the 2025 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 12, 2026 or the day prior to the 2026 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 12, 2025, subject to the reporting person's continued service through the applicable vesting date.