<SEC-DOCUMENT>0000899243-17-026997.txt : 20171120
<SEC-HEADER>0000899243-17-026997.hdr.sgml : 20171120
<ACCEPTANCE-DATETIME>20171120172827
ACCESSION NUMBER:		0000899243-17-026997
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20171120
FILED AS OF DATE:		20171120
DATE AS OF CHANGE:		20171120

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Ross Michael Jay
		CENTRAL INDEX KEY:			0001254452

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38295
		FILM NUMBER:		171214822

	MAIL ADDRESS:	
		STREET 1:		C/O SV HEALTH INVESTORS, LLC
		STREET 2:		ONE BOSTON PLC, 201 WASHINGTON ST. #3900
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02108

	FORMER NAME:	
		FORMER CONFORMED NAME:	ROSS MICHAEL JAY
		DATE OF NAME CHANGE:	20030715

ISSUER:		

	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

	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>
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<SEQUENCE>1
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                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F7"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
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                </underlyingSecurityShares>
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                    <value>See Footnote</value>
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        </derivativeTransaction>
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            </transactionTimeliness>
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                </transactionPricePerShare>
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                <footnoteId id="F3"/>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
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        <derivativeTransaction>
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                <value>Series C Convertible Preferred Stock</value>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>224665</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
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                <footnoteId id="F4"/>
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                <footnoteId id="F4"/>
            </expirationDate>
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                <underlyingSecurityTitle>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>111955</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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                    <value>I</value>
                </directOrIndirectOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series C Convertible Preferred Stock</value>
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            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>4747</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
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            <expirationDate>
                <footnoteId id="F4"/>
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                <underlyingSecurityShares>
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                </underlyingSecurityShares>
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                </sharesOwnedFollowingTransaction>
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                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F9"/>
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        </derivativeTransaction>
        <derivativeTransaction>
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                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>692552</value>
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            <exerciseDate>
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            <expirationDate>
                <footnoteId id="F5"/>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
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                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
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                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
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            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
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                <value>Series D Convertible Preferred Stock</value>
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                <footnoteId id="F5"/>
            </conversionOrExercisePrice>
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            <deemedExecutionDate></deemedExecutionDate>
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                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
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            <expirationDate>
                <footnoteId id="F5"/>
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                </underlyingSecurityShares>
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                <value></value>
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            <transactionAmounts>
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                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                <footnoteId id="F5"/>
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                </underlyingSecurityShares>
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                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
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            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series D Convertible Preferred Stock</value>
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                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
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                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                <footnoteId id="F5"/>
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                    <value>Common Stock</value>
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                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>I</value>
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    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Series A-1 Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-1 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date.</footnote>
        <footnote id="F2">The Series A-2 Convertible Preferred Stock converted into Common Stock on a 0.35785-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-2 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date.</footnote>
        <footnote id="F3">The Series B Convertible Preferred Stock converted into Common Stock on a 0.44650-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series B Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date.</footnote>
        <footnote id="F4">The Series C Convertible Preferred Stock converted into Common Stock on a 0.49832-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series C Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date.</footnote>
        <footnote id="F5">The Series D Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date.</footnote>
        <footnote id="F6">These shares are owned directly by SV Life Sciences Fund V, L.P. (&quot;SVLS V LP&quot;). SV Life Sciences Fund V (GP), LP (&quot;SVLS V GP&quot;) is the general partner of SVLS V LP. The general partner of SVLS V GP is SVLSF V, LLC.  The reporting person, a member of the investment committee of SVLSF V, LLC, may be deemed to share voting, dispositive and investment power over the shares held of record by SVLS V LP. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.</footnote>
        <footnote id="F7">These shares are owned directly by SV Life Sciences Fund V Strategic Partners, L.P. (&quot;SVLS V SPP&quot;). SVLS V GP is the general partner of SVLS V SPP. The general partner of SVLS V GP is SVLSF V, LLC. The reporting person, a member of the investment committee of SVLSF V, LLC, may be deemed to share voting, dispositive and investment power over the shares held of record by SVLS V LP. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.</footnote>
        <footnote id="F8">These shares are owned directly by SV Life Sciences Fund VI, L.P. (&quot;SVLS VI LP&quot;). SV Life Sciences Fund VI (GP), LP (&quot;SVLS VI GP&quot;) is the general partner of SVLS VI LP. The general partner of SVLS VI GP is SVLSF VI, LLC. The reporting person, a member of the investment committee of SVLSF VI, LLC, may be deemed to share voting, dispositive and investment power over the shares held of record by SVLS V LP. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.</footnote>
        <footnote id="F9">These shares are owned directly by SV Life Sciences Fund VI Strategic Partners, L.P. (&quot;SVLS VI SPP&quot;). SVLS VI GP is the general partner of SVLS VI SPP. The general partner of SVLS VI GP is SVLSF VI, LLC. The reporting person, a member of the investment committee of SVLSF VI, LLC, may be deemed to share voting, dispositive and investment power over the shares held of record by SVLS V LP. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Mike Gray, attorney-in-fact</signatureName>
        <signatureDate>2017-11-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
