Keith Crandell - Jun 11, 2025 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 11, 2025
Transactions value $
$0
Form type
4
Date filed
6/13/2025, 04:18 PM
Previous filing
Feb 7, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
CRANDELL KEITH Director, 10%+ Owner 8755 WEST HIGGINS ROAD, SUITE 1025, CHICAGO /s/ Michael S. Turner, as Attorney-in-Fact 2025-06-13 0001219039

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MASS Common Stock Options Exercise +11.4K +81.6% 25.3K Jun 11, 2025 Direct F1
holding MASS Common Stock 5.73M Jun 11, 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 -11.4K -100% $0.00 0 Jun 11, 2025 Common Stock 11.4K Direct F1, F3
transaction MASS Restricted Stock Units Award $0 +14.1K $0.00 14.1K Jun 12, 2025 Common Stock 14.1K Direct F4, F5
transaction MASS Stock Option (option to buy) Award $0 +6.52K $0.00 6.52K Jun 12, 2025 Common Stock 6.52K $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 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 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.