December 15, 2020

Office of Life Sciences

Division of Corporation Finance
U.S. Securities and Exchange Commission
100 F Street, N.E.

Washington, D.C. 20549

Re:        908 Devices Inc.

Registration Statement on Form S-1 (File No. 333-250954)

Request for Acceleration

Ladies and Gentlemen:

Pursuant to Rule 460 of the General Rules and Regulations under the Securities Act of 1933, as amended, we wish to advise that as of the date hereof, approximately 860 copies of the Preliminary Prospectus dated December 14, 2020 were distributed to prospective underwriters, institutional investors and prospective dealers in connection with the above captioned Registration Statement.

We wish to advise you that the participating underwriters have informed us that they have complied and will continue to comply with the requirements of Rule 15c2-8 under the Securities Exchange Act of 1934, as amended.

We hereby join in the request of the registrant that the effectiveness of the above-captioned Registration Statement, as amended, be accelerated to 4:00 p.m. Eastern Time, on Thursday, December 17, 2020 or as soon thereafter as practicable.

[Signature page follows]

Very truly yours,
Cowen and Company, LLC
SVB Leerink LLC
As representatives of the Underwriters
By:	Cowen and Company, LLC
By:	/s/ Bill Follis
	Name:	Bill Follis
	Title:	Managing Director
By:	SVB Leerink LLC
By:	/s/ Ryan Lindquist
	Name:	Ryan Lindquist
	Title:	Managing Director

[Signature Page to 908 Devices Inc. Acceleration Request]