<SEC-DOCUMENT>0001193125-18-076441-index.html : 20180309
<SEC-HEADER>0001193125-18-076441.hdr.sgml : 20180309
<ACCEPTANCE-DATETIME>20180309100519
ACCESSION NUMBER:		0001193125-18-076441
CONFORMED SUBMISSION TYPE:	S-8
PUBLIC DOCUMENT COUNT:		4
FILED AS OF DATE:		20180309
DATE AS OF CHANGE:		20180309
EFFECTIVENESS DATE:		20180309

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:		S-8
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-223539
		FILM NUMBER:		18678764

	BUSINESS ADDRESS:	
		STREET 1:		890 WINTER STREET, SUITE 230
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451
		BUSINESS PHONE:		781-819-5704

	MAIL ADDRESS:	
		STREET 1:		890 WINTER STREET, SUITE 230
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-8
<SEQUENCE>1
<FILENAME>d535539ds8.htm
<DESCRIPTION>S-8
<TEXT>
Document 1 - file: d535539ds8.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>d535539dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 2 - file: d535539dex51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.2
<SEQUENCE>3
<FILENAME>d535539dex232.htm
<DESCRIPTION>EX-23.2
<TEXT>
Document 3 - file: d535539dex232.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g535539g0308021511061.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g535539g0308021511061.jpg

</DOCUMENT>
</SEC-DOCUMENT>