<SEC-DOCUMENT>0000950123-17-008563-index.html : 20171020
<SEC-HEADER>0000950123-17-008563.hdr.sgml : 20171020
<ACCEPTANCE-DATETIME>20170920170704
<PRIVATE-TO-PUBLIC>
ACCESSION NUMBER:		0000950123-17-008563
CONFORMED SUBMISSION TYPE:	DRS/A
PUBLIC DOCUMENT COUNT:		14
FILED AS OF DATE:		20170920
<PUBLIC-REL-DATE>20171020
DATE AS OF CHANGE:		20171004

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:		DRS/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	377-01662
		FILM NUMBER:		171094534

	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>DRS/A
<SEQUENCE>1
<FILENAME>filename1.htm
<TEXT>
Document 1 - file: filename1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10
<SEQUENCE>2
<FILENAME>filename2.htm
<TEXT>
Document 2 - file: filename2.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10
<SEQUENCE>3
<FILENAME>filename3.htm
<TEXT>
Document 3 - file: filename3.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g427310g13u57.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g427310g13u57.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g427310g33a79.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g427310g33a79.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>g427310g33c79.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: g427310g33c79.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>g427310g39n62.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: g427310g39n62.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g427310g52l47_color.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g427310g52l47_color.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g427310g58p18.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: g427310g58p18.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>g427310g59g46_color.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: g427310g59g46_color.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>11
<FILENAME>g427310g79v47.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 11 - file: g427310g79v47.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>12
<FILENAME>g427310g87d19.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 12 - file: g427310g87d19.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>13
<FILENAME>g427310snap0003.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 13 - file: g427310snap0003.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>14
<FILENAME>g427310snap0004.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 14 - file: g427310snap0004.jpg

</DOCUMENT>
</SEC-DOCUMENT>