John Kenneweg - 26 Feb 2026 Form 3 Insider Report for 908 Devices Inc. (MASS)

Role
SVP, Sales & Product Marketing
Signature
/s/ Mark S. Levine, Attorney-in-Fact
Issuer symbol
MASS
Transactions as of
26 Feb 2026
Net transactions value
$0
Form type
3
Filing time
06 Mar 2026, 16:25:55 UTC
Previous filing
14 Apr 2022
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Kenneweg John SVP, Sales & Product Marketing C/O 908 DEVICES INC., 44 3RD AVENUE, BURLINGTON /s/ Mark S. Levine, Attorney-in-Fact 06 Mar 2026 0001836876

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding MASS Common Stock 57,784 26 Feb 2026 Direct

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
holding MASS Stock Option (right to buy) 26 Feb 2026 Common Stock 27,656 $0.9600 Direct F1
holding MASS Stock Option (right to buy) 26 Feb 2026 Common Stock 61,459 $1.58 Direct F1
holding MASS Stock Option (right to buy) 26 Feb 2026 Common Stock 36,875 $3.24 Direct F1
holding MASS Stock Option (right to buy) 26 Feb 2026 Common Stock 8,702 $24.00 Direct F1
holding MASS Stock Option (right to buy) 26 Feb 2026 Common Stock 13,460 $16.66 Direct F1
holding MASS Stock Option (right to buy) 26 Feb 2026 Common Stock 46,049 $8.83 Direct F2
holding MASS Stock Option (right to buy) 26 Feb 2026 Common Stock 41,822 $7.35 Direct F3
holding MASS Stock Option (right to buy) 26 Feb 2026 Common Stock 39,828 $1.98 Direct F4
holding MASS Stock Option (right to buy) 26 Feb 2026 Common Stock 21,187 $6.19 Direct F5
holding MASS Restricted Stock Units 26 Feb 2026 Common Stock 7,588 Direct F6, F7
holding MASS Restricted Stock Units 26 Feb 2026 Common Stock 15,306 Direct F7, F8
holding MASS Restricted Stock Units 26 Feb 2026 Common Stock 58,333 Direct F7, F8
holding MASS Restricted Stock Units 26 Feb 2026 Common Stock 48,466 Direct F7, F9
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The shares underlying the option are fully vested and immediately exercisable.
F2 Twenty-five percent of the shares underlying the option became vested and exercisable on February 1, 2024, and the remaining 75% of the shares underlying the option became or will become vested and exercisable in substantially equal monthly installments over the 36 months following February 1, 2024, subject to the reporting person's continued service through the applicable vesting date.
F3 Twenty-five percent of the shares underlying the option became vested and exercisable on February 1, 2025, and the remaining 75% of the shares underlying the option became or will become vested and exercisable in substantially equal monthly installments over the 36 months following February 1, 2025, subject to the reporting person's continued service through the applicable vesting date.
F4 One-third of the shares underlying the option became vested and exercisable on February 1, 2026, and the remaining two-thirds of the shares underlying the option became or will become vested and exercisable in substantially equal monthly installments over the 24 months following February 1, 2026, subject to the reporting person's continued service through the applicable vesting date.
F5 One-third of the shares underlying the option become vested and exercisable on February 1, 2027, and the remaining two-thirds of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 24 months following February 1, 2027, subject to the reporting person's continued service through the applicable vesting date.
F6 These restricted stock units ("RSUs") vest on February 1, 2027, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.
F7 Each RSU represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.
F8 These RSUs vest in two substantially equal annual installments at the two anniversary dates following February 1, 2026, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.
F9 These RSUs vest in three substantially equal annual installments at the three anniversary dates following February 1, 2026, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.