Arsanis, Inc.
950 Winter Street, Suite 4500
Waltham, MA 02451
February 12, 2019
VIA EDGAR
Securities and Exchange Commission
Division of Corporation Finance
100 F Street, N.E.
Washington, D.C. 20549
| Re: | Arsanis, Inc. |
| Registration Statement on Form S-3 |
| File No. 333-229377 |
| Request for Acceleration |
Ladies and Gentlemen:
Pursuant to Rule 461 promulgated under the Securities Act of 1933, as amended, Arsanis, Inc. (the “Registrant”) hereby requests acceleration of the effective date of its Registration Statement on Form S-3 (File No. 333-229377), as amended (the “Registration Statement”), so that it may become effective at 4:00 p.m. Eastern time on February 14, 2019, or as soon thereafter as practicable.
[Remainder of Page Intentionally Left Blank]
| Very truly yours, | ||||
| ARSANIS, INC. | ||||
| By: | /s/ Michael P. Gray | |||
| Name: | Michael P. Gray | |||
| Title: | President and Chief Executive Officer, Chief Financial Officer | |||
Signature Page to Acceleration Request