908 Devices Inc. — Director's Dealing 2026

Feb 3, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: 908 Devices Inc. (MASS)
CIK: 0001555279
Period of Report: 2026-02-01

Reporting Person: Brown Christopher D. (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-01	Common Stock	M	5027	—	Acquired	967149	Direct
2026-02-01	Common Stock	M	7418	—	Acquired	974567	Direct
2026-02-01	Common Stock	M	10992	—	Acquired	985559	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-01	Restricted Stock Units	$	M	5027	Disposed		Common Stock (5027)	Direct
2026-02-01	Restricted Stock Units	$	M	7418	Disposed		Common Stock (7418)	Direct
2026-02-01	Restricted Stock Units	$	M	10992	Disposed		Common Stock (10992)	Direct

Footnotes

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.