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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>Prime CNAV Master Fund</nameOfIssuer>
      <titleOfIssuer>Prime CNAV Master Fund</titleOfIssuer>
      <coupon/>
      <CUSIPMember>927XQC905</CUSIPMember>
      <LEIID>549300K8VKMIOPMVLW91</LEIID>
      <cik>0001403166</cik>
      <otherUniqueId>927XQC905</otherUniqueId>
      <investmentCategory>Investment Company</investmentCategory>
      <securityEligibilityFlag>Y</securityEligibilityFlag>
      <investmentMaturityDateWAM>2026-09-01</investmentMaturityDateWAM>
      <investmentMaturityDateWAL>2026-09-01</investmentMaturityDateWAL>
      <finalLegalInvestmentMaturityDate>2026-09-01</finalLegalInvestmentMaturityDate>
      <securityDemandFeatureFlag>N</securityDemandFeatureFlag>
      <securityGuaranteeFlag>N</securityGuaranteeFlag>
      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0000</yieldOfTheSecurityAsOfReportingDate>
      <includingValueOfAnySponsorSupport>8888697085.20</includingValueOfAnySponsorSupport>
      <excludingValueOfAnySponsorSupport>8888697085.20</excludingValueOfAnySponsorSupport>
      <percentageOfMoneyMarketFundNetAssets>1.0000</percentageOfMoneyMarketFundNetAssets>
      <securityCategorizedAtLevel3Flag>N</securityCategorizedAtLevel3Flag>
      <dailyLiquidAssetSecurityFlag>Y</dailyLiquidAssetSecurityFlag>
      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
      <explanatoryNotes>The master-feeder funds are parties to a written daily liquidity agreement; consistent with SEC staff interpretative guidance, ownership interests in the master fund are categorized as a Daily Liquid Asset/Weekly Liquid Asset by the feeder funds.</explanatoryNotes>
    </scheduleOfPortfolioSecuritiesInfo>
    <dispositionOfPortfolioSecurities>
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      <govtAgencyCouponPayingDebtAmt>0.00</govtAgencyCouponPayingDebtAmt>
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      <otherMunicipalSecurityAmt>0.00</otherMunicipalSecurityAmt>
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      <otherAssetBackedSecuritiesAmt>0.00</otherAssetBackedSecuritiesAmt>
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      <investmentCompanyAmt>0.00</investmentCompanyAmt>
      <financialCompanyCommercialAmt>0.00</financialCompanyCommercialAmt>
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      <otherInstrumentBriefDescription>N/A</otherInstrumentBriefDescription>
    </dispositionOfPortfolioSecurities>
    <signature>
      <registrant>UBS Series Funds</registrant>
      <signatureDate>2026-09-08</signatureDate>
      <signature>/s/Rose Ann Bubloski</signature>
      <nameOfSigningOfficer>Rose Ann Bubloski</nameOfSigningOfficer>
      <titleOfSigningOfficer>Vice President</titleOfSigningOfficer>
    </signature>
  </formData>
</edgarSubmission>
