<SEC-DOCUMENT>0001193125-19-069299-index.html : 20190308
<SEC-HEADER>0001193125-19-069299.hdr.sgml : 20190308
<ACCEPTANCE-DATETIME>20190308171705
ACCESSION NUMBER:		0001193125-19-069299
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20190308
DATE AS OF CHANGE:		20190308
EFFECTIVENESS DATE:		20190308

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Arsanis, Inc.
		CENTRAL INDEX KEY:			0001501697
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				273181608
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38295
		FILM NUMBER:		19670059

	BUSINESS ADDRESS:	
		STREET 1:		950 WINTER STREET, SUITE 4500
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451
		BUSINESS PHONE:		781-819-5704

	MAIL ADDRESS:	
		STREET 1:		950 WINTER STREET, SUITE 4500
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>d681826ddefa14a.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: d681826ddefa14a.htm

</DOCUMENT>
</SEC-DOCUMENT>