<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2016-08-09</periodOfReport>

    <dateOfOriginalSubmission>2016-08-09</dateOfOriginalSubmission>

    <issuer>
        <issuerCik>0001472091</issuerCik>
        <issuerName>Edge Therapeutics, Inc.</issuerName>
        <issuerTradingSymbol>EDGE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001214501</rptOwnerCik>
            <rptOwnerName>MIDDLEKAUFF W BRADFORD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>300 CONNELL DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 4000</rptOwnerStreet2>
            <rptOwnerCity>BERKELEY HEIGHTS</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07922</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>Senior VP, GC and Secretary</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12850.96</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>401(K) Plan</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Reflects periodic contributions to the issuer's common stock fund in the issuer's 401(K) Plan as of December 28, 2018. This amendment is being filed to include these shares of the issuer's common stock that were omitted in the prior report.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ W. Bradford Middlekauff, Reporting Person</signatureName>
        <signatureDate>2018-12-31</signatureDate>
    </ownerSignature>
</ownershipDocument>
