<SEC-DOCUMENT>0000899243-20-008389.txt : 20200316
<SEC-HEADER>0000899243-20-008389.hdr.sgml : 20200316
<ACCEPTANCE-DATETIME>20200316094631
ACCESSION NUMBER:		0000899243-20-008389
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20200312
FILED AS OF DATE:		20200316
DATE AS OF CHANGE:		20200316

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Tune Edward X.
		CENTRAL INDEX KEY:			0001774922

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	814-00861
		FILM NUMBER:		20715608

	MAIL ADDRESS:	
		STREET 1:		C/O FIDUS INVESTMENT CORPORATION
		STREET 2:		1603 ORRINGTON AVENUE, SUITE 1005
		CITY:			EVANSTON
		STATE:			IL
		ZIP:			60201

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FIDUS INVESTMENT Corp
		CENTRAL INDEX KEY:			0001513363
		IRS NUMBER:				275017321
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1603 ORRINGTON AVENUE
		STREET 2:		SUITE 820
		CITY:			EVANSTON
		STATE:			IL
		ZIP:			60201
		BUSINESS PHONE:		847-859-3940

	MAIL ADDRESS:	
		STREET 1:		1603 ORRINGTON AVENUE
		STREET 2:		SUITE 820
		CITY:			EVANSTON
		STATE:			IL
		ZIP:			60201
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-03-12</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001513363</issuerCik>
        <issuerName>FIDUS INVESTMENT Corp</issuerName>
        <issuerTradingSymbol>FDUS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001774922</rptOwnerCik>
            <rptOwnerName>Tune Edward X.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FIDUS INVESTMENT CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>1603 ORRINGTON AVENUE, SUITE 1005</rptOwnerStreet2>
            <rptOwnerCity>EVANSTON</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-03-12</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>9.43</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The price in Column 4 is a weighted average price, rounded to the nearest hundredth. These shares were purchased in multiple transactions, and the actual sale prices ranged from $9.41 to $9.47 per share. The reporting person will provide to the Issuer, any security holder of the Issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Edward X. Tune</signatureName>
        <signatureDate>2020-03-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
