Christopher D. Brown - 01 Feb 2026 Form 4 Insider Report for 908 Devices Inc. (MASS)

Role
Director
Signature
/s/ Mark S. Levine, Attorney-in-Fact
Issuer symbol
MASS
Transactions as of
01 Feb 2026
Net transactions value
$0
Form type
4
Filing time
03 Feb 2026, 20:45:26 UTC
Previous filing
18 Jun 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Brown Christopher D. Director C/O 908 DEVICES INC., 44 3RD AVENUE, BURLINGTON /s/ Mark S. Levine, Attorney-in-Fact 03 Feb 2026 0001836988

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MASS Common Stock Options Exercise +5,027 +0.52% 967,149 01 Feb 2026 Direct F1
transaction MASS Common Stock Options Exercise +7,418 +0.77% 974,567 01 Feb 2026 Direct F1
transaction MASS Common Stock Options Exercise +10,992 +1.1% 985,559 01 Feb 2026 Direct F1

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 -5,027 -100% $0.000000 0 01 Feb 2026 Common Stock 5,027 Direct F1, F2
transaction MASS Restricted Stock Units Options Exercise $0 -7,418 -50% $0.000000 7,418 01 Feb 2026 Common Stock 7,418 Direct F1, F3
transaction MASS Restricted Stock Units Options Exercise $0 -10,992 -33% $0.000000 21,982 01 Feb 2026 Common Stock 10,992 Direct F1, F4
* 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, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.
F2 These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2022, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.
F3 These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2023, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.
F4 These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2024, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.