<?xml version="1.0" encoding="UTF-8"?>
<edgarSubmission xmlns="http://www.sec.gov/edgar/nmfp" xmlns:com="http://www.sec.gov/edgar/common" xmlns:invest="http://www.sec.gov/edgar/invest" xmlns:part1="http://www.sec.gov/edgar/nmfpfund" xmlns:part2="http://www.sec.gov/edgar/nmfpsecurities" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sec.gov/edgar/nmfp eis_NMFP_Submission.xsd">
  <submissionType>N-MFP</submissionType>
  <liveTestFlag>LIVE</liveTestFlag>


  <isThisElectronicCopyOfPaperFormat>N</isThisElectronicCopyOfPaperFormat>
  <DocumentPeriodEndDate>2015-06-30</DocumentPeriodEndDate>
  <EntityCentralIndexKey>1186233</EntityCentralIndexKey>

  <seriesId>S000002954</seriesId>
  <totalClassesInSeries>4</totalClassesInSeries>
  <isThisFinalFiling>N</isThisFinalFiling>
  <isFundLiquidating>N</isFundLiquidating>
  <isFundMergingWithOrBeingAcquiredByAnotherFund>N</isFundMergingWithOrBeingAcquiredByAnotherFund>
  <hasFundAcquiredOrMergedWithAnotherFundSinceLastFiling>N</hasFundAcquiredOrMergedWithAnotherFundSinceLastFiling>
  <seriesLevelInformation>
    <part1:ContainedFileInformationFileNumber>333-99395</part1:ContainedFileInformationFileNumber>
    <part1:investmentAdviserList>
      <part1:adviser>
        <part1:adviserName>BlackRock Advisors, LLC</part1:adviserName>
        <part1:adviserFileNumber>801-47710</part1:adviserFileNumber>
      </part1:adviser>
    </part1:investmentAdviserList>
    <part1:independentPublicAccountant>
      <part1:name>DELOITTE &amp; TOUCHE LLP</part1:name>
      <part1:city>Boston</part1:city>
      <part1:state>MA</part1:state>
    </part1:independentPublicAccountant>
    <part1:administratorList>
      <part1:administrator>State Street </part1:administrator>
    </part1:administratorList>
    <part1:transferAgentList>
      <part1:transferAgent>
        <part1:name>FINANCIAL DATA SERVICES, INC.</part1:name>
        <part1:EntityCentralIndexKey>0000774455</part1:EntityCentralIndexKey>
        <part1:fileNumber>84-01339</part1:fileNumber>
      </part1:transferAgent>
    </part1:transferAgentList>
    <part1:isThisFeederFund>Y</part1:isThisFeederFund>
    <part1:masterFund>
      <part1:EntityCentralIndexKey>0001186241</part1:EntityCentralIndexKey>
      <part1:EntityRegistrantName>Master Government Securities LLC</part1:EntityRegistrantName>
      <part1:seriesIdentifier>S000002952</part1:seriesIdentifier>
    </part1:masterFund>
    <part1:isThisMasterFund>N</part1:isThisMasterFund>
    <part1:isThisSeriesPrimarilyUsedToFundInsuranceCompanySeperateAccounts>N</part1:isThisSeriesPrimarilyUsedToFundInsuranceCompanySeperateAccounts>
    <part1:InvestmentTypeDomain>Government/Agency</part1:InvestmentTypeDomain>
    <part1:dollarWeightedAveragePortfolioMaturity>1</part1:dollarWeightedAveragePortfolioMaturity>
    <part1:dollarWeightedAverageLifeMaturity>1</part1:dollarWeightedAverageLifeMaturity>
    <part1:AvailableForSaleSecuritiesAmortizedCost>216160004.77</part1:AvailableForSaleSecuritiesAmortizedCost>
    <part1:OtherAssets>190717.38</part1:OtherAssets>
    <part1:Liabilities>155183.40</part1:Liabilities>
    <part1:AssetsNet>216195538.75</part1:AssetsNet>
    <part1:MoneyMarketSevenDayYield>0.0008</part1:MoneyMarketSevenDayYield>
    <part1:seriesShadowPrice>
      <part1:netValuePerShareIncludingCapitalSupportAgreement>1.0001</part1:netValuePerShareIncludingCapitalSupportAgreement>
      <part1:dateCalculatedFornetValuePerShareIncludingCapitalSupportAgreement>2015-06-30</part1:dateCalculatedFornetValuePerShareIncludingCapitalSupportAgreement>
      <part1:netValuePerShareExcludingCapitalSupportAgreement>1.0001</part1:netValuePerShareExcludingCapitalSupportAgreement>
      <part1:dateCalculatedFornetValuePerShareExcludingCapitalSupportAgreement>2015-06-30</part1:dateCalculatedFornetValuePerShareExcludingCapitalSupportAgreement>
    </part1:seriesShadowPrice>
  </seriesLevelInformation>
  <classLevelInformationList>
    <part1:classLevelInformation>
      <part1:classId>C000008084</part1:classId>
      <part1:minInitialInvestment>1.00</part1:minInitialInvestment>
      <part1:netAssetsOfClass>5517267.20</part1:netAssetsOfClass>
      <part1:netAssetValuePerShare>1.00</part1:netAssetValuePerShare>
      <part1:netShareholderFlowActivityForMonthEnded>-609593.00</part1:netShareholderFlowActivityForMonthEnded>
      <part1:grossSubscriptionsForMonthEnded>4956640.00</part1:grossSubscriptionsForMonthEnded>
      <part1:grossRedemptionsForMonthEnded>5566233.00</part1:grossRedemptionsForMonthEnded>
      <part1:sevenDayNetYield>0.0000</part1:sevenDayNetYield>
      <part1:classShadowPrice>
        <part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
          <part1:value>1.0001</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2015-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
        <part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
          <part1:value>1.0001</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2015-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
      </part1:classShadowPrice>
    </part1:classLevelInformation>
    <part1:classLevelInformation>
      <part1:classId>C000008085</part1:classId>
      <part1:minInitialInvestment>1.00</part1:minInitialInvestment>
      <part1:netAssetsOfClass>11578340.66</part1:netAssetsOfClass>
      <part1:netAssetValuePerShare>1.00</part1:netAssetValuePerShare>
      <part1:netShareholderFlowActivityForMonthEnded>-662351.00</part1:netShareholderFlowActivityForMonthEnded>
      <part1:grossSubscriptionsForMonthEnded>8561471.00</part1:grossSubscriptionsForMonthEnded>
      <part1:grossRedemptionsForMonthEnded>9223822.00</part1:grossRedemptionsForMonthEnded>
      <part1:sevenDayNetYield>0.0000</part1:sevenDayNetYield>
      <part1:classShadowPrice>
        <part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
          <part1:value>1.0001</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2015-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
        <part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
          <part1:value>1.0001</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2015-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
      </part1:classShadowPrice>
    </part1:classLevelInformation>
    <part1:classLevelInformation>
      <part1:classId>C000008086</part1:classId>
      <part1:minInitialInvestment>1.00</part1:minInitialInvestment>
      <part1:netAssetsOfClass>43697545.65</part1:netAssetsOfClass>
      <part1:netAssetValuePerShare>1.00</part1:netAssetValuePerShare>
      <part1:netShareholderFlowActivityForMonthEnded>-9260092.99</part1:netShareholderFlowActivityForMonthEnded>
      <part1:grossSubscriptionsForMonthEnded>24366424.81</part1:grossSubscriptionsForMonthEnded>
      <part1:grossRedemptionsForMonthEnded>33626517.80</part1:grossRedemptionsForMonthEnded>
      <part1:sevenDayNetYield>0.0000</part1:sevenDayNetYield>
      <part1:classShadowPrice>
        <part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
          <part1:value>1.0001</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2015-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
        <part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
          <part1:value>1.0001</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2015-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
      </part1:classShadowPrice>
    </part1:classLevelInformation>
    <part1:classLevelInformation>
      <part1:classId>C000008087</part1:classId>
      <part1:minInitialInvestment>1.00</part1:minInitialInvestment>
      <part1:netAssetsOfClass>155402385.24</part1:netAssetsOfClass>
      <part1:netAssetValuePerShare>1.00</part1:netAssetValuePerShare>
      <part1:netShareholderFlowActivityForMonthEnded>5985329.06</part1:netShareholderFlowActivityForMonthEnded>
      <part1:grossSubscriptionsForMonthEnded>150814361.60</part1:grossSubscriptionsForMonthEnded>
      <part1:grossRedemptionsForMonthEnded>144829032.54</part1:grossRedemptionsForMonthEnded>
      <part1:sevenDayNetYield>0.0000</part1:sevenDayNetYield>
      <part1:classShadowPrice>
        <part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
          <part1:value>1.0001</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2015-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareIncludingCapitalSupportAgreement>
        <part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
          <part1:value>1.0001</part1:value>
          <part1:dateAsOfWhichValueWasCalculated>2015-06-30</part1:dateAsOfWhichValueWasCalculated>
        </part1:netAssetValuePerShareExcludingCapitalSupportAgreement>
      </part1:classShadowPrice>
    </part1:classLevelInformation>
  </classLevelInformationList>
  <scheduleOfPortfolioSecuritiesList>
    <part2:scheduleOfPortfolioSecurities>
      <part2:InvestmentIssuer>Master Government Securities LLC</part2:InvestmentIssuer>
      <part2:InvestmentTitle>Master Government Securities LLC 0.000000%</part2:InvestmentTitle>
      <part2:InvestmentIdentifier>BLKRK89N4</part2:InvestmentIdentifier>
      <part2:EntityCentralIndexKey>0001186241</part2:EntityCentralIndexKey>
      <part2:InvestmentTypeDomain>Investment Company</part2:InvestmentTypeDomain>
      <part2:isFundTreatingAsAcquisitionUnderlyingSecurities>N</part2:isFundTreatingAsAcquisitionUnderlyingSecurities>
      <part2:rating>First Tier Security</part2:rating>
      <part2:designatedNRSROList>
        <part2:designatedNRSRO>
          <part2:RAN>N/A</part2:RAN>
          <part2:R>N/A</part2:R>
        </part2:designatedNRSRO>
      </part2:designatedNRSROList>
      <part2:InvestmentMaturityDate>2015-07-01</part2:InvestmentMaturityDate>
      <part2:finalLegalInvestmentMaturityDate>2015-07-01</part2:finalLegalInvestmentMaturityDate>
      <part2:doesSecurityHaveDemandFeature>N</part2:doesSecurityHaveDemandFeature>
      <part2:doesSecurityHaveGuarantee>N</part2:doesSecurityHaveGuarantee>
      <part2:doesSecurityHaveEnhancementsOnWhichFundRelying>N</part2:doesSecurityHaveEnhancementsOnWhichFundRelying>
      <part2:InvestmentOwnedBalancePrincipalAmount>216160004.77</part2:InvestmentOwnedBalancePrincipalAmount>
      <part2:AvailableForSaleSecuritiesAmortizedCost>216160004.77</part2:AvailableForSaleSecuritiesAmortizedCost>
      <part2:InvestmentOwnedPercentOfNetAssets>0.9998</part2:InvestmentOwnedPercentOfNetAssets>
      <part2:isThisIlliquidSecurity>N</part2:isThisIlliquidSecurity>
      <part2:InvestmentOwnedAtFairValue>216160004.77</part2:InvestmentOwnedAtFairValue>
      <part2:valueOfSecurityExcludingValueOfCapitalSupportAgreement>216160004.77</part2:valueOfSecurityExcludingValueOfCapitalSupportAgreement>
    </part2:scheduleOfPortfolioSecurities>
  </scheduleOfPortfolioSecuritiesList>
</edgarSubmission>
