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    <isConfidential>false</isConfidential>
    <filerInfo>

      <filer>
        <issuerCredentials>
          <cik>0001469192</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>


      <seriesClassInfo>
        <seriesId>S000028522</seriesId>
        <classId>C000087297</classId>
        <classId>C000087299</classId>
        <classId>C000087300</classId>
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        <classId>C000087296</classId>
        <classId>C000087298</classId>
        <classId>C000087301</classId>
      </seriesClassInfo>


    </filerInfo>
  </headerData>
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    <genInfo>
      <regName>MAINSTAY FUNDS TRUST</regName>
      <regFileNumber>811-22321</regFileNumber>
      <regCik>0001469192</regCik>
      <regLei>549300SQRLBSUG7RD002</regLei>
      <regStreet1>51 MADISON AVENUE</regStreet1>
      <regCity>NEW YORK</regCity>
      <regStateConditional regCountry="US" regState="US-NY"/>
      <regZipOrPostalCode>10010</regZipOrPostalCode>
      <regPhone>212-576-7000</regPhone>
      <seriesName>MainStay Epoch International Choice Fund</seriesName>
      <seriesId>S000028522</seriesId>
      <seriesLei>549300FPTWJRAID17352</seriesLei>
      <repPdEnd>2020-10-31</repPdEnd>
      <repPdDate>2020-01-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
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      <totLiabs>477399.74</totLiabs>
      <netAssets>394120531.19</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>0.00000000</assetsInvested>
      <amtPayOneYrBanksBorr>0.00000000</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0.00000000</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0.00000000</amtPayOneYrOthAffil>
      <amtPayOneYrOther>0.00000000</amtPayOneYrOther>
      <amtPayAftOneYrBanksBorr>0.00000000</amtPayAftOneYrBanksBorr>
      <amtPayAftOneYrCtrldComp>0.00000000</amtPayAftOneYrCtrldComp>
      <amtPayAftOneYrOthAffil>0.00000000</amtPayAftOneYrOthAffil>
      <amtPayAftOneYrOther>0.00000000</amtPayAftOneYrOther>
      <delayDeliv>0.00000000</delayDeliv>
      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
      <cshNotRptdInCorD>8353.57000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000087299" rtn1="1.89000000" rtn2="4.26000000" rtn3="-1.91000000"/>
          <monthlyTotReturn classId="C000087301" rtn1="1.84000000" rtn2="4.20000000" rtn3="-1.94000000"/>
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          <monthlyTotReturn classId="C000087295" rtn1="1.86000000" rtn2="4.22000000" rtn3="-1.93000000"/>
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        <othMon2 netRealizedGain="2395622.21000000" netUnrealizedAppr="14737699.21000000"/>
        <othMon3 netRealizedGain="3249929.58000000" netUnrealizedAppr="-10726304.26000000"/>
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      <mon3Flow redemption="18686130.66000000" reinvestment="0.00000000" sales="643435.51000000"/>

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        <invCountry>JP</invCountry>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
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        <name>Sony Corp</name>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
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          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Croda International PLC</name>
        <lei>2138004WCNBFJEEOXV26</lei>
        <title>Croda International PLC</title>
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        <invCountry>GB</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Akzo Nobel NV</name>
        <lei>724500XYIJUGXAA5QD70</lei>
        <title>Akzo Nobel NV</title>
        <cusip>000000000</cusip>
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        <invCountry>NL</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Koninklijke Philips NV</name>
        <lei>H1FJE8H61JGM1JSGM897</lei>
        <title>Koninklijke Philips NV</title>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Koninklijke DSM NV</name>
        <lei>724500SNT1MK246AHP04</lei>
        <title>Koninklijke DSM NV</title>
        <cusip>000000000</cusip>
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        <invCountry>NL</invCountry>
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        <fairValLevel>1</fairValLevel>
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        <name>Cellnex Telecom SA</name>
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        <isRestrictedSec>Y</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
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        <name>CSL Ltd</name>
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        <invCountry>AU</invCountry>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
        <name>Safran SA</name>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
        <name>ABB Ltd</name>
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      <invstOrSec>
        <name>Sands China Ltd</name>
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        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
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        <name>Asahi Group Holdings Ltd</name>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
        <name>Nordea Bank Abp</name>
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        <fairValLevel>1</fairValLevel>
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        <name>Storebrand ASA</name>
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        <name>MainStay US Government Liquidity Fund</name>
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        <name>SAP SE</name>
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        <invCountry>DE</invCountry>
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        <fairValLevel>1</fairValLevel>
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        <name>ASML Holding NV</name>
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        <title>ASML Holding NV</title>
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        <invCountry>NL</invCountry>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>58.com Inc</name>
        <lei>549300R31W8UMZCTNF95</lei>
        <title>58.com Inc</title>
        <cusip>31680Q104</cusip>
        <identifiers>
          <isin value="US31680Q1040"/>
        </identifiers>
        <balance>78138.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4346035.56000000</valUSD>
        <pctVal>1.102717370972</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>KY</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Heineken NV</name>
        <lei>724500K5PTPSST86UQ23</lei>
        <title>Heineken NV</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="NL0000009165"/>
        </identifiers>
        <balance>94161.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="EUR" exchangeRt="0.90167300"/>
        <valUSD>10267480.03000000</valUSD>
        <pctVal>2.605162435714</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>NL</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Nippon Telegraph &amp; Telephone Corp</name>
        <lei>353800VHQU5VIXVUA841</lei>
        <title>Nippon Telegraph &amp; Telephone Corp</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="JP3735400008"/>
        </identifiers>
        <balance>321180.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="JPY" exchangeRt="108.35500000"/>
        <valUSD>8259591.80000000</valUSD>
        <pctVal>2.095701986156</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>JP</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Ubisoft Entertainment SA</name>
        <lei>969500I7C8V1LBIMSM05</lei>
        <title>Ubisoft Entertainment SA</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="FR0000054470"/>
        </identifiers>
        <balance>178819.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="EUR" exchangeRt="0.90167300"/>
        <valUSD>13612624.71000000</valUSD>
        <pctVal>3.453924277656</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>FR</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Novartis AG</name>
        <lei>5493007HIVTX6SY6XD66</lei>
        <title>Novartis AG</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="CH0012005267"/>
        </identifiers>
        <balance>137115.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="CHF" exchangeRt="0.96320000"/>
        <valUSD>12978378.89000000</valUSD>
        <pctVal>3.292997411429</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>CH</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Nestle SA</name>
        <lei>KY37LUS27QQX7BB93L28</lei>
        <title>Nestle SA</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="CH0038863350"/>
        </identifiers>
        <balance>146691.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="CHF" exchangeRt="0.96320000"/>
        <valUSD>16201192.46000000</valUSD>
        <pctVal>4.110720243647</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>CH</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Kering SA</name>
        <lei>549300VGEJKB7SVUZR78</lei>
        <title>Kering SA</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="FR0000121485"/>
        </identifiers>
        <balance>15830.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="EUR" exchangeRt="0.90167300"/>
        <valUSD>9743720.84000000</valUSD>
        <pctVal>2.472269285383</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>FR</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Linde PLC</name>
        <lei>8945002PAZHZLBGKGF02</lei>
        <title>Linde PLC</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="IE00BZ12WP82"/>
        </identifiers>
        <balance>68493.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>13912983.09000000</valUSD>
        <pctVal>3.530134055181</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>IE</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Victrex PLC</name>
        <lei>213800UYNPHAUNHPXL67</lei>
        <title>Victrex PLC</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="GB0009292243"/>
        </identifiers>
        <balance>265670.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="GBP" exchangeRt="0.75728900"/>
        <valUSD>7774108.96000000</valUSD>
        <pctVal>1.972520674456</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>GB</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Industria de Diseno Textil SA</name>
        <lei>549300TTCXZOGZM2EY83</lei>
        <title>Industria de Diseno Textil SA</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="ES0148396007"/>
        </identifiers>
        <balance>400723.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="EUR" exchangeRt="0.90167300"/>
        <valUSD>13497085.43000000</valUSD>
        <pctVal>3.424608555470</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>ES</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Suzuki Motor Corp</name>
        <lei>353800D83H0V3ZV1SV24</lei>
        <title>Suzuki Motor Corp</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="JP3397200001"/>
        </identifiers>
        <balance>287500.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="JPY" exchangeRt="108.35500000"/>
        <valUSD>13351483.55000000</valUSD>
        <pctVal>3.387665065224</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>JP</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Pernod Ricard SA</name>
        <lei>52990097YFPX9J0H5D87</lei>
        <title>Pernod Ricard SA</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="FR0000120693"/>
        </identifiers>
        <balance>58430.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="EUR" exchangeRt="0.90167300"/>
        <valUSD>10141475.90000000</valUSD>
        <pctVal>2.573191472511</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>FR</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Samsung Electronics Co Ltd</name>
        <lei>9884007ER46L6N7EI764</lei>
        <title>Samsung Electronics Co Ltd</title>
        <cusip>796050888</cusip>
        <identifiers>
          <isin value="US7960508882"/>
        </identifiers>
        <balance>14801.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>17346772.00000000</valUSD>
        <pctVal>4.401387552082</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>KR</invCountry>
        <isRestrictedSec>Y</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Takeda Pharmaceutical Co Ltd</name>
        <lei>549300ZLMVP4X0OGR454</lei>
        <title>Takeda Pharmaceutical Co Ltd</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="JP3463000004"/>
        </identifiers>
        <balance>502400.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="JPY" exchangeRt="108.35500000"/>
        <valUSD>19598955.29000000</valUSD>
        <pctVal>4.972832861770</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>JP</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Swiss Re AG</name>
        <lei>529900PS9YW3YY29F326</lei>
        <title>Swiss Re AG</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="CH0126881561"/>
        </identifiers>
        <balance>88529.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="CHF" exchangeRt="0.96320000"/>
        <valUSD>10018335.76000000</valUSD>
        <pctVal>2.541947188021</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>CH</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <explntrNotes>
      <explntrNote note="Monthly returns presented in Item B.5(a) have been calculated without deducting any applicable sales loads or redemption fees." noteItem="B.5.a"/>
    </explntrNotes>
    <signature>
      <ncom:dateSigned>2020-02-27</ncom:dateSigned>
      <ncom:nameOfApplicant>MAINSTAY FUNDS TRUST</ncom:nameOfApplicant>
      <ncom:signature>Jack Benintende</ncom:signature>
      <ncom:signerName>Jack Benintende</ncom:signerName>
      <ncom:title>Treasurer</ncom:title>
    </signature>
  </formData>
  <documents>XXXX</documents>
</edgarSubmission>
