SEC Form 4 · accession 0001219039-26-000002

908 Devices Inc. · MASS

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

Keith Crandell

Director

Period of report

Jun 10, 2026

Accepted (ET)

Jun 12, 2026 · 4:46 pm EDT

Rule 10b5-1 plan

box not checked

Issuer CIK

0001555279

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F1	Jun 10, 2026	M	14,083	—	A	39,374	D
Common Stock^F2	holding	—	—		—	5,725,045	I	See footnote

Table II — derivative securities

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Restricted Stock Units^F1,F3	—	Jun 10, 2026	M	14,083	D	—	—	Common Stock	14,083	0	D
Restricted Stock Units^F1,F4	—	Jun 11, 2026	A	13,656	A	—	—	Common Stock	13,656	13,656	D
Stock Option (option to buy)^F5	$8.22	Jun 11, 2026	A	6,209	A	—	Jun 10, 2036	Common Stock	6,209	6,209	D

Explanation of responses

F1Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.
F2The 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.
F3The RSUs became fully vested on June 10, 2026, the day prior to the 2026 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.
F4The RSUs become fully vested on June 11, 2027 or the day prior to the 2027 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.
F5The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following June 11, 2026, subject to the reporting person's continued service through the applicable vesting date.