<SEC-DOCUMENT>0001193125-19-017208-index.html : 20190125
<SEC-HEADER>0001193125-19-017208.hdr.sgml : 20190125
<ACCEPTANCE-DATETIME>20190125170412
ACCESSION NUMBER:		0001193125-19-017208
CONFORMED SUBMISSION TYPE:	S-3
PUBLIC DOCUMENT COUNT:		11
FILED AS OF DATE:		20190125
DATE AS OF CHANGE:		20190125

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-3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-229377
		FILM NUMBER:		19543183

	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>
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<FILENAME>d659064ds3.htm
<DESCRIPTION>S-3
<TEXT>
Document 1 - file: d659064ds3.htm

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<DOCUMENT>
<TYPE>EX-4.5
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<FILENAME>d659064dex45.htm
<DESCRIPTION>EX-4.5
<TEXT>
Document 2 - file: d659064dex45.htm

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<SEQUENCE>3
<FILENAME>d659064dex46.htm
<DESCRIPTION>EX-4.6
<TEXT>
Document 3 - file: d659064dex46.htm

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<DOCUMENT>
<TYPE>EX-4.7
<SEQUENCE>4
<FILENAME>d659064dex47.htm
<DESCRIPTION>EX-4.7
<TEXT>
Document 4 - file: d659064dex47.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.8
<SEQUENCE>5
<FILENAME>d659064dex48.htm
<DESCRIPTION>EX-4.8
<TEXT>
Document 5 - file: d659064dex48.htm

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<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>6
<FILENAME>d659064dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 6 - file: d659064dex51.htm

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<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>7
<FILENAME>d659064dex231.htm
<DESCRIPTION>EX-23.1
<TEXT>
Document 7 - file: d659064dex231.htm

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<DOCUMENT>
<TYPE>EX-23.2
<SEQUENCE>8
<FILENAME>d659064dex232.htm
<DESCRIPTION>EX-23.2
<TEXT>
Document 8 - file: d659064dex232.htm

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<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>9
<FILENAME>d659064dex991.htm
<DESCRIPTION>EX-99.1
<TEXT>
Document 9 - file: d659064dex991.htm

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<DOCUMENT>
<TYPE>EX-99.2
<SEQUENCE>10
<FILENAME>d659064dex992.htm
<DESCRIPTION>EX-99.2
<TEXT>
Document 10 - file: d659064dex992.htm

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>11
<FILENAME>g659064g67t82.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 11 - file: g659064g67t82.jpg

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