<SUBMISSION>
<ACCESSION-NUMBER>0001104659-19-014948
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20190312
<FILING-DATE>20190314
<DATE-OF-FILING-DATE-CHANGE>20190314
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>MOLLENKOPF JOHN C
<CIK>0001235082
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>001-36719
<FILM-NUMBER>19682691
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>1515 ARAPAHOE ST.
<STREET2>TOWER 2, SUITE 700
<CITY>DENVER
<STATE>CO
<ZIP>80202
</MAIL-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>Antero Midstream Partners LP
<CIK>0001598968
<ASSIGNED-SIC>4922
<IRS-NUMBER>464109058
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>1615 WYNKOOP STREET
<CITY>DENVER
<STATE>CO
<ZIP>80202
<PHONE>(303) 357-7310
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>1615 WYNKOOP STREET
<CITY>DENVER
<STATE>CO
<ZIP>80202
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>Antero Resources Midstream LLC
<DATE-CHANGED>20140203
</FORMER-COMPANY>
</ISSUER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-03-12</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001598968</issuerCik>
        <issuerName>Antero Midstream Partners LP</issuerName>
        <issuerTradingSymbol>AM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001235082</rptOwnerCik>
            <rptOwnerName>MOLLENKOPF JOHN C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1615 WYNKOOP STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DENVER</rptOwnerCity>
            <rptOwnerState>CO</rptOwnerState>
            <rptOwnerZipCode>80202</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Units representing limited partner interests</value>
            </securityTitle>
            <transactionDate>
                <value>2019-03-12</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>6065</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Each common unit representing limited partnership interests of the Issuer (&quot;AM Common Units&quot;) was disposed of pursuant to the Simplification Agreement (the &quot;Simplification Agreement&quot;), dated as of October 9, 2018, by and among the Issuer, Antero Midstream Corporation (f/k/a Antero Midstream GP LP, &quot;New AM&quot;)  and certain of their affiliates.  Pursuant to the Simplification Agreement, holders of AM Common Units (other than Antero Resources Corporation) received, in exchange for each AM Common Unit held, (i) $3.415 in cash without interest and 1.6350 shares of New AM Common Stock (&quot;New AM Common Stock&quot;), (ii) 1.8926 shares of New AM Common Stock, or (iii) $10.1364 in cash and 1.1279 shares of New AM Common Stock.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Alvyn A. Schopp, as attorney-in-fact for John C. Mollenkopf</signatureName>
        <signatureDate>2019-03-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
