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      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Bills, 1.55%</titleOfIssuer>
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      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
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    <scheduleOfPortfolioSecuritiesInfo>
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      <investmentMaturityDateWAM>2020-05-21</investmentMaturityDateWAM>
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      <securityEnhancementsFlag>N</securityEnhancementsFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Bills, 1.55%</titleOfIssuer>
      <CUSIPMember>912796WY1</CUSIPMember>
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      <investmentMaturityDateWAL>2020-07-30</investmentMaturityDateWAL>
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      <securityEnhancementsFlag>N</securityEnhancementsFlag>
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      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Bills, 1.56%</titleOfIssuer>
      <CUSIPMember>912796SH3</CUSIPMember>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
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      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Bills, 1.57%</titleOfIssuer>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Bills, 1.57%</titleOfIssuer>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
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      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
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      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0153</yieldOfTheSecurityAsOfReportingDate>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.54%</titleOfIssuer>
      <CUSIPMember>9128284J6</CUSIPMember>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
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      <investmentMaturityDateWAL>2020-04-30</investmentMaturityDateWAL>
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      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.55%</titleOfIssuer>
      <CUSIPMember>912828Y53</CUSIPMember>
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      <investmentCategory>U.S. Treasury Debt</investmentCategory>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
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      <investmentMaturityDateWAM>2020-03-02</investmentMaturityDateWAM>
      <investmentMaturityDateWAL>2020-07-31</investmentMaturityDateWAL>
      <finalLegalInvestmentMaturityDate>2020-07-31</finalLegalInvestmentMaturityDate>
      <securityDemandFeatureFlag>N</securityDemandFeatureFlag>
      <securityGuaranteeFlag>N</securityGuaranteeFlag>
      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0154</yieldOfTheSecurityAsOfReportingDate>
      <includingValueOfAnySponsorSupport>76004575.20</includingValueOfAnySponsorSupport>
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      <percentageOfMoneyMarketFundNetAssets>0.0254</percentageOfMoneyMarketFundNetAssets>
      <securityCategorizedAtLevel3Flag>N</securityCategorizedAtLevel3Flag>
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      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.56%</titleOfIssuer>
      <CUSIPMember>9128284Q0</CUSIPMember>
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      <securityEnhancementsFlag>N</securityEnhancementsFlag>
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      <includingValueOfAnySponsorSupport>19048984.28</includingValueOfAnySponsorSupport>
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      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.56%</titleOfIssuer>
      <CUSIPMember>912828XE5</CUSIPMember>
      <LEIID>254900HROIFWPRGM1V77</LEIID>
      <ISINId>US912828XE52</ISINId>
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      <investmentMaturityDateWAL>2020-05-31</investmentMaturityDateWAL>
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      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.57% to 1.59%</titleOfIssuer>
      <CUSIPMember>9128284C1</CUSIPMember>
      <LEIID>254900HROIFWPRGM1V77</LEIID>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
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      <investmentMaturityDateWAM>2020-03-31</investmentMaturityDateWAM>
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      <includingValueOfAnySponsorSupport>23014496.44</includingValueOfAnySponsorSupport>
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      <dailyLiquidAssetSecurityFlag>Y</dailyLiquidAssetSecurityFlag>
      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.57% to 1.59%</titleOfIssuer>
      <CUSIPMember>912828XY1</CUSIPMember>
      <LEIID>254900HROIFWPRGM1V77</LEIID>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
        <rating>N/A</rating>
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      <investmentMaturityDateWAL>2020-06-30</investmentMaturityDateWAL>
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      <securityDemandFeatureFlag>N</securityDemandFeatureFlag>
      <securityGuaranteeFlag>N</securityGuaranteeFlag>
      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0139</yieldOfTheSecurityAsOfReportingDate>
      <includingValueOfAnySponsorSupport>41152148.54</includingValueOfAnySponsorSupport>
      <excludingValueOfAnySponsorSupport>41152148.54</excludingValueOfAnySponsorSupport>
      <percentageOfMoneyMarketFundNetAssets>0.0137</percentageOfMoneyMarketFundNetAssets>
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      <dailyLiquidAssetSecurityFlag>Y</dailyLiquidAssetSecurityFlag>
      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.58% to 1.59%</titleOfIssuer>
      <CUSIPMember>912828K58</CUSIPMember>
      <LEIID>254900HROIFWPRGM1V77</LEIID>
      <ISINId>US912828K585</ISINId>
      <investmentCategory>U.S. Treasury Debt</investmentCategory>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
        <rating>N/A</rating>
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      <investmentMaturityDateWAM>2020-04-30</investmentMaturityDateWAM>
      <investmentMaturityDateWAL>2020-04-30</investmentMaturityDateWAL>
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      <securityDemandFeatureFlag>N</securityDemandFeatureFlag>
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      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0144</yieldOfTheSecurityAsOfReportingDate>
      <includingValueOfAnySponsorSupport>19997681.40</includingValueOfAnySponsorSupport>
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      <percentageOfMoneyMarketFundNetAssets>0.0067</percentageOfMoneyMarketFundNetAssets>
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      <dailyLiquidAssetSecurityFlag>Y</dailyLiquidAssetSecurityFlag>
      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.58%</titleOfIssuer>
      <CUSIPMember>912828XM7</CUSIPMember>
      <LEIID>254900HROIFWPRGM1V77</LEIID>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
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      <securityDemandFeatureFlag>N</securityDemandFeatureFlag>
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      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0128</yieldOfTheSecurityAsOfReportingDate>
      <includingValueOfAnySponsorSupport>14020234.34</includingValueOfAnySponsorSupport>
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      <percentageOfMoneyMarketFundNetAssets>0.0047</percentageOfMoneyMarketFundNetAssets>
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      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.59%</titleOfIssuer>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
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      <percentageOfMoneyMarketFundNetAssets>0.0033</percentageOfMoneyMarketFundNetAssets>
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      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.59%</titleOfIssuer>
      <CUSIPMember>912828XH8</CUSIPMember>
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      <percentageOfMoneyMarketFundNetAssets>0.0047</percentageOfMoneyMarketFundNetAssets>
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      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
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      <CUSIPMember>9128282J8</CUSIPMember>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.59%</titleOfIssuer>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.62%</titleOfIssuer>
      <CUSIPMember>912828X96</CUSIPMember>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.63%</titleOfIssuer>
      <CUSIPMember>9128285Y2</CUSIPMember>
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      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0156</yieldOfTheSecurityAsOfReportingDate>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.65%</titleOfIssuer>
      <CUSIPMember>9128286Q8</CUSIPMember>
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      <securityEnhancementsFlag>N</securityEnhancementsFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.66%</titleOfIssuer>
      <CUSIPMember>912828Z45</CUSIPMember>
      <LEIID>254900HROIFWPRGM1V77</LEIID>
      <ISINId>US912828Z450</ISINId>
      <investmentCategory>U.S. Treasury Debt</investmentCategory>
      <securityEligibilityFlag>Y</securityEligibilityFlag>
      <NRSRO>
        <nameOfNRSRO>N/A</nameOfNRSRO>
        <rating>N/A</rating>
      </NRSRO>
      <investmentMaturityDateWAM>2020-03-02</investmentMaturityDateWAM>
      <investmentMaturityDateWAL>2022-01-31</investmentMaturityDateWAL>
      <finalLegalInvestmentMaturityDate>2022-01-31</finalLegalInvestmentMaturityDate>
      <securityDemandFeatureFlag>N</securityDemandFeatureFlag>
      <securityGuaranteeFlag>N</securityGuaranteeFlag>
      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0168</yieldOfTheSecurityAsOfReportingDate>
      <includingValueOfAnySponsorSupport>64986147.85</includingValueOfAnySponsorSupport>
      <excludingValueOfAnySponsorSupport>64986147.85</excludingValueOfAnySponsorSupport>
      <percentageOfMoneyMarketFundNetAssets>0.0217</percentageOfMoneyMarketFundNetAssets>
      <securityCategorizedAtLevel3Flag>N</securityCategorizedAtLevel3Flag>
      <dailyLiquidAssetSecurityFlag>Y</dailyLiquidAssetSecurityFlag>
      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
    </scheduleOfPortfolioSecuritiesInfo>
    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.73%</titleOfIssuer>
      <CUSIPMember>9128287G9</CUSIPMember>
      <LEIID>254900HROIFWPRGM1V77</LEIID>
      <ISINId>US9128287G95</ISINId>
      <investmentCategory>U.S. Treasury Debt</investmentCategory>
      <securityEligibilityFlag>Y</securityEligibilityFlag>
      <NRSRO>
        <nameOfNRSRO>N/A</nameOfNRSRO>
        <rating>N/A</rating>
      </NRSRO>
      <investmentMaturityDateWAM>2020-03-02</investmentMaturityDateWAM>
      <investmentMaturityDateWAL>2021-07-31</investmentMaturityDateWAL>
      <finalLegalInvestmentMaturityDate>2021-07-31</finalLegalInvestmentMaturityDate>
      <securityDemandFeatureFlag>N</securityDemandFeatureFlag>
      <securityGuaranteeFlag>N</securityGuaranteeFlag>
      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0159</yieldOfTheSecurityAsOfReportingDate>
      <includingValueOfAnySponsorSupport>75143912.25</includingValueOfAnySponsorSupport>
      <excludingValueOfAnySponsorSupport>75143912.25</excludingValueOfAnySponsorSupport>
      <percentageOfMoneyMarketFundNetAssets>0.0251</percentageOfMoneyMarketFundNetAssets>
      <securityCategorizedAtLevel3Flag>N</securityCategorizedAtLevel3Flag>
      <dailyLiquidAssetSecurityFlag>Y</dailyLiquidAssetSecurityFlag>
      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
    </scheduleOfPortfolioSecuritiesInfo>
    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.81%</titleOfIssuer>
      <CUSIPMember>912828YN4</CUSIPMember>
      <LEIID>254900HROIFWPRGM1V77</LEIID>
      <ISINId>US912828YN43</ISINId>
      <investmentCategory>U.S. Treasury Debt</investmentCategory>
      <securityEligibilityFlag>Y</securityEligibilityFlag>
      <NRSRO>
        <nameOfNRSRO>N/A</nameOfNRSRO>
        <rating>N/A</rating>
      </NRSRO>
      <investmentMaturityDateWAM>2020-03-02</investmentMaturityDateWAM>
      <investmentMaturityDateWAL>2021-10-31</investmentMaturityDateWAL>
      <finalLegalInvestmentMaturityDate>2021-10-31</finalLegalInvestmentMaturityDate>
      <securityDemandFeatureFlag>N</securityDemandFeatureFlag>
      <securityGuaranteeFlag>N</securityGuaranteeFlag>
      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0159</yieldOfTheSecurityAsOfReportingDate>
      <includingValueOfAnySponsorSupport>71257069.70</includingValueOfAnySponsorSupport>
      <excludingValueOfAnySponsorSupport>71257069.70</excludingValueOfAnySponsorSupport>
      <percentageOfMoneyMarketFundNetAssets>0.0238</percentageOfMoneyMarketFundNetAssets>
      <securityCategorizedAtLevel3Flag>N</securityCategorizedAtLevel3Flag>
      <dailyLiquidAssetSecurityFlag>Y</dailyLiquidAssetSecurityFlag>
      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
    </scheduleOfPortfolioSecuritiesInfo>
    <signature>
      <registrant>Fidelity Hereford Street Trust: Fidelity Treasury Only Money Market Fund</registrant>
      <signatureDate>2020-03-03</signatureDate>
      <signature>Laura M. Del Prato</signature>
      <nameOfSigningOfficer>Laura M. Del Prato</nameOfSigningOfficer>
      <titleOfSigningOfficer>President and Treasurer</titleOfSigningOfficer>
    </signature>
  </formData>
</edgarSubmission>
