N-CSRSfalse0000002110N-1A0.0210.0210.2550.2000.1740.1680.0960.0480.9830.0340.0110.0210.0210.2550.2000.1740.1680.0960.0480.9830.0340.0110.0480.0210.0210.0110.2550.2000.1740.1680.0960.9830.0340.0210.2000.1740.1680.0960.0480.0210.9830.0340.0110.2550.0210.0210.2550.2000.1740.1680.0960.0480.9830.0340.0110.0210.2000.1740.1680.0960.0480.0210.9830.0340.0110.2550.0270.0520.0430.0380.0370.0360.0310.0410.0140.3410.1780.13500.0820.1580.1000.0770.0690.0530.0490.2200.2140.0820.0520.0430.0380.0370.0360.0490.0410.0140.3410.1780.13500.2140.1580.1000.0770.0690.0530.2200.0310.0270.0430.0380.0370.0360.0310.0270.0140.3410.1780.13500.0820.0520.1000.0770.0690.0530.0490.0410.2200.2140.1580.2200.0370.0360.0310.0270.1780.13500.0820.0520.0430.0380.0690.0530.0490.0410.0140.3410.2140.1580.1000.0770.0380.0370.0360.0310.0270.3410.1780.13500.0820.0520.0430.0770.0690.0530.0490.0410.0140.2200.2140.1580.1000.0240.0220.0200.0230.0220.0070.2710.2030.1590.1540.1460.1320.1110.1000.0840.2100.0850.0790.0710.0360.0270.0200.07900.0710.0360.0270.0240.0220.0220.0070.2710.2030.1590.0850.1460.1320.1110.1000.0840.0230.2100.1540.0220.0200.0850.07900.0710.0360.0270.0240.0230.0220.0070.2710.2030.1590.1540.1460.1320.1110.1000.0840.2100.0710.0360.0270.0240.0220.0200.0070.2710.2030.1590.0850.07900.1320.1110.1000.0840.0230.0220.2100.1540.1460.0710.0360.0270.0240.0220.0200.0070.2710.2030.1590.0850.07900.1320.1110.1000.0840.0230.0220.2100.1540.1460.0600.0030.5360.3210.0810.0810.0600.0030.5360.3210.5360.3210.0810.0600.0030.0600.0030.5360.3210.0810.0600.0030.5360.3210.0810.0030.5360.3210.0810.0600.0330.0530.0470.0470.0460.0430.0340.0250.0150.3280.15900.1150.0810.0740.0650.0650.0400.0370.0270.3120.2210.0840.3120.0430.0340.0330.1150.0810.0530.0470.0470.0460.0370.0270.0250.0150.3280.15900.2210.0840.0740.0650.0650.040Annualized. 0000002110 2025-01-01 2025-06-30 0000002110 cik0000002110:C000024954Member 2025-06-30 0000002110 cik0000002110:C000024954Member cik0000002110:SPXTechnologiesIncMember 2025-06-30 0000002110 cik0000002110:C000024954Member us-gaap:EnergySectorMember 2025-06-30 0000002110 cik0000002110:C000024954Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000024954Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000024954Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000024954Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000024954Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000024954Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000024954Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000024954Member cik0000002110:CarlyleGroupIncTheMember 2025-06-30 0000002110 cik0000002110:C000024954Member cik0000002110:HealthEquityIncMember 2025-06-30 0000002110 cik0000002110:C000024954Member cik0000002110:ColliersInternationalGroupIncMember 2025-06-30 0000002110 cik0000002110:C000024954Member us-gaap:CommonStockMember 2025-06-30 0000002110 cik0000002110:C000024954Member cik0000002110:MoneyMarketFundMember 2025-06-30 0000002110 cik0000002110:C000024954Member cik0000002110:ExchangeTradedEquityFundsMember 2025-06-30 0000002110 cik0000002110:C000024954Member cik0000002110:ChurchillDownsIncMember 2025-06-30 0000002110 cik0000002110:C000024954Member cik0000002110:GCMGrosvenorIncClassAMember 2025-06-30 0000002110 cik0000002110:C000024954Member cik0000002110:ParsonsCorpMember 2025-06-30 0000002110 cik0000002110:C000024954Member cik0000002110:CurtissWrightCorpMember 2025-06-30 0000002110 cik0000002110:C000024954Member cik0000002110:WingstopIncMember 2025-06-30 0000002110 cik0000002110:C000024954Member cik0000002110:FiveBelowIncMember 2025-06-30 0000002110 cik0000002110:C000024956Member 2025-06-30 0000002110 cik0000002110:C000024956Member cik0000002110:SPXTechnologiesIncMember 2025-06-30 0000002110 cik0000002110:C000024956Member us-gaap:EnergySectorMember 2025-06-30 0000002110 cik0000002110:C000024956Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000024956Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000024956Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000024956Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000024956Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000024956Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000024956Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000024956Member cik0000002110:CarlyleGroupIncTheMember 2025-06-30 0000002110 cik0000002110:C000024956Member cik0000002110:HealthEquityIncMember 2025-06-30 0000002110 cik0000002110:C000024956Member cik0000002110:ColliersInternationalGroupIncMember 2025-06-30 0000002110 cik0000002110:C000024956Member us-gaap:CommonStockMember 2025-06-30 0000002110 cik0000002110:C000024956Member cik0000002110:MoneyMarketFundMember 2025-06-30 0000002110 cik0000002110:C000024956Member cik0000002110:ExchangeTradedEquityFundsMember 2025-06-30 0000002110 cik0000002110:C000024956Member cik0000002110:ChurchillDownsIncMember 2025-06-30 0000002110 cik0000002110:C000024956Member cik0000002110:GCMGrosvenorIncClassAMember 2025-06-30 0000002110 cik0000002110:C000024956Member cik0000002110:ParsonsCorpMember 2025-06-30 0000002110 cik0000002110:C000024956Member cik0000002110:CurtissWrightCorpMember 2025-06-30 0000002110 cik0000002110:C000024956Member cik0000002110:WingstopIncMember 2025-06-30 0000002110 cik0000002110:C000024956Member cik0000002110:FiveBelowIncMember 2025-06-30 0000002110 cik0000002110:C000024957Member 2025-06-30 0000002110 cik0000002110:C000024957Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000024957Member us-gaap:EnergySectorMember 2025-06-30 0000002110 cik0000002110:C000024957Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000024957Member cik0000002110:ExchangeTradedEquityFundsMember 2025-06-30 0000002110 cik0000002110:C000024957Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000024957Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000024957Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000024957Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000024957Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000024957Member cik0000002110:FiveBelowIncMember 2025-06-30 0000002110 cik0000002110:C000024957Member cik0000002110:CarlyleGroupIncTheMember 2025-06-30 0000002110 cik0000002110:C000024957Member cik0000002110:HealthEquityIncMember 2025-06-30 0000002110 cik0000002110:C000024957Member cik0000002110:ColliersInternationalGroupIncMember 2025-06-30 0000002110 cik0000002110:C000024957Member us-gaap:CommonStockMember 2025-06-30 0000002110 cik0000002110:C000024957Member cik0000002110:MoneyMarketFundMember 2025-06-30 0000002110 cik0000002110:C000024957Member cik0000002110:SPXTechnologiesIncMember 2025-06-30 0000002110 cik0000002110:C000024957Member cik0000002110:ChurchillDownsIncMember 2025-06-30 0000002110 cik0000002110:C000024957Member cik0000002110:GCMGrosvenorIncClassAMember 2025-06-30 0000002110 cik0000002110:C000024957Member cik0000002110:ParsonsCorpMember 2025-06-30 0000002110 cik0000002110:C000024957Member cik0000002110:CurtissWrightCorpMember 2025-06-30 0000002110 cik0000002110:C000024957Member cik0000002110:WingstopIncMember 2025-06-30 0000002110 cik0000002110:C000122736Member 2025-06-30 0000002110 cik0000002110:C000122736Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000122736Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000122736Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000122736Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000122736Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000122736Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000122736Member us-gaap:EnergySectorMember 2025-06-30 0000002110 cik0000002110:C000122736Member cik0000002110:HealthEquityIncMember 2025-06-30 0000002110 cik0000002110:C000122736Member cik0000002110:ColliersInternationalGroupIncMember 2025-06-30 0000002110 cik0000002110:C000122736Member us-gaap:CommonStockMember 2025-06-30 0000002110 cik0000002110:C000122736Member cik0000002110:MoneyMarketFundMember 2025-06-30 0000002110 cik0000002110:C000122736Member cik0000002110:ExchangeTradedEquityFundsMember 2025-06-30 0000002110 cik0000002110:C000122736Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000122736Member cik0000002110:GCMGrosvenorIncClassAMember 2025-06-30 0000002110 cik0000002110:C000122736Member cik0000002110:ParsonsCorpMember 2025-06-30 0000002110 cik0000002110:C000122736Member cik0000002110:CurtissWrightCorpMember 2025-06-30 0000002110 cik0000002110:C000122736Member cik0000002110:WingstopIncMember 2025-06-30 0000002110 cik0000002110:C000122736Member cik0000002110:FiveBelowIncMember 2025-06-30 0000002110 cik0000002110:C000122736Member cik0000002110:CarlyleGroupIncTheMember 2025-06-30 0000002110 cik0000002110:C000122736Member cik0000002110:SPXTechnologiesIncMember 2025-06-30 0000002110 cik0000002110:C000122736Member cik0000002110:ChurchillDownsIncMember 2025-06-30 0000002110 cik0000002110:C000122737Member 2025-06-30 0000002110 cik0000002110:C000122737Member us-gaap:EnergySectorMember 2025-06-30 0000002110 cik0000002110:C000122737Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000122737Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000122737Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000122737Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000122737Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000122737Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000122737Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000122737Member cik0000002110:CarlyleGroupIncTheMember 2025-06-30 0000002110 cik0000002110:C000122737Member cik0000002110:HealthEquityIncMember 2025-06-30 0000002110 cik0000002110:C000122737Member cik0000002110:ColliersInternationalGroupIncMember 2025-06-30 0000002110 cik0000002110:C000122737Member us-gaap:CommonStockMember 2025-06-30 0000002110 cik0000002110:C000122737Member cik0000002110:MoneyMarketFundMember 2025-06-30 0000002110 cik0000002110:C000122737Member cik0000002110:ExchangeTradedEquityFundsMember 2025-06-30 0000002110 cik0000002110:C000122737Member cik0000002110:ChurchillDownsIncMember 2025-06-30 0000002110 cik0000002110:C000122737Member cik0000002110:GCMGrosvenorIncClassAMember 2025-06-30 0000002110 cik0000002110:C000122737Member cik0000002110:ParsonsCorpMember 2025-06-30 0000002110 cik0000002110:C000122737Member cik0000002110:CurtissWrightCorpMember 2025-06-30 0000002110 cik0000002110:C000122737Member cik0000002110:WingstopIncMember 2025-06-30 0000002110 cik0000002110:C000122737Member cik0000002110:FiveBelowIncMember 2025-06-30 0000002110 cik0000002110:C000122737Member cik0000002110:SPXTechnologiesIncMember 2025-06-30 0000002110 cik0000002110:C000251059Member 2025-06-30 0000002110 cik0000002110:C000251059Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000251059Member cik0000002110:SPXTechnologiesIncMember 2025-06-30 0000002110 cik0000002110:C000251059Member cik0000002110:ChurchillDownsIncMember 2025-06-30 0000002110 cik0000002110:C000251059Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000251059Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000251059Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000251059Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000251059Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000251059Member us-gaap:EnergySectorMember 2025-06-30 0000002110 cik0000002110:C000251059Member cik0000002110:HealthEquityIncMember 2025-06-30 0000002110 cik0000002110:C000251059Member cik0000002110:ColliersInternationalGroupIncMember 2025-06-30 0000002110 cik0000002110:C000251059Member us-gaap:CommonStockMember 2025-06-30 0000002110 cik0000002110:C000251059Member cik0000002110:MoneyMarketFundMember 2025-06-30 0000002110 cik0000002110:C000251059Member cik0000002110:ExchangeTradedEquityFundsMember 2025-06-30 0000002110 cik0000002110:C000251059Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000251059Member cik0000002110:GCMGrosvenorIncClassAMember 2025-06-30 0000002110 cik0000002110:C000251059Member cik0000002110:ParsonsCorpMember 2025-06-30 0000002110 cik0000002110:C000251059Member cik0000002110:CurtissWrightCorpMember 2025-06-30 0000002110 cik0000002110:C000251059Member cik0000002110:WingstopIncMember 2025-06-30 0000002110 cik0000002110:C000251059Member cik0000002110:FiveBelowIncMember 2025-06-30 0000002110 cik0000002110:C000251059Member cik0000002110:CarlyleGroupIncTheMember 2025-06-30 0000002110 cik0000002110:C000024958Member 2025-06-30 0000002110 cik0000002110:C000024958Member country:FI 2025-06-30 0000002110 cik0000002110:C000024958Member country:CH 2025-06-30 0000002110 cik0000002110:C000024958Member country:SE 2025-06-30 0000002110 cik0000002110:C000024958Member country:US 2025-06-30 0000002110 cik0000002110:C000024958Member country:AU 2025-06-30 0000002110 cik0000002110:C000024958Member country:NL 2025-06-30 0000002110 cik0000002110:C000024958Member country:FR 2025-06-30 0000002110 cik0000002110:C000024958Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000024958Member us-gaap:EnergySectorMember 2025-06-30 0000002110 cik0000002110:C000024958Member country:JP 2025-06-30 0000002110 cik0000002110:C000024958Member country:GB 2025-06-30 0000002110 cik0000002110:C000024958Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000024958Member country:DE 2025-06-30 0000002110 cik0000002110:C000024958Member oef:CommunicationsSectorMember 2025-06-30 0000002110 cik0000002110:C000024958Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000024958Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000024958Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000024958Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000024958Member oef:MaterialsSectorMember 2025-06-30 0000002110 cik0000002110:C000024958Member cik0000002110:NiterraCoLtdMember 2025-06-30 0000002110 cik0000002110:C000024958Member cik0000002110:NemetschekSEMember 2025-06-30 0000002110 cik0000002110:C000024958Member cik0000002110:BelimoHoldingAGRegisteredSharesMember 2025-06-30 0000002110 cik0000002110:C000024958Member cik0000002110:CARGroupLtdMember 2025-06-30 0000002110 cik0000002110:C000024958Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000024958Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000024958Member cik0000002110:CapcomCoLtdMember 2025-06-30 0000002110 cik0000002110:C000024958Member cik0000002110:HalmaPLCMember 2025-06-30 0000002110 cik0000002110:C000024958Member cik0000002110:RightmovePLCMember 2025-06-30 0000002110 cik0000002110:C000024958Member cik0000002110:FisherAndPaykelHealthcareCorpLtdMember 2025-06-30 0000002110 cik0000002110:C000024958Member cik0000002110:CTSEventimAGAndCoKGaAMember 2025-06-30 0000002110 cik0000002110:C000024958Member cik0000002110:AutoTraderGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000024961Member 2025-06-30 0000002110 cik0000002110:C000024961Member cik0000002110:CapcomCoLtdMember 2025-06-30 0000002110 cik0000002110:C000024961Member cik0000002110:HalmaPLCMember 2025-06-30 0000002110 cik0000002110:C000024961Member cik0000002110:RightmovePLCMember 2025-06-30 0000002110 cik0000002110:C000024961Member cik0000002110:FisherAndPaykelHealthcareCorpLtdMember 2025-06-30 0000002110 cik0000002110:C000024961Member cik0000002110:CTSEventimAGAndCoKGaAMember 2025-06-30 0000002110 cik0000002110:C000024961Member country:DE 2025-06-30 0000002110 cik0000002110:C000024961Member country:CH 2025-06-30 0000002110 cik0000002110:C000024961Member country:SE 2025-06-30 0000002110 cik0000002110:C000024961Member country:US 2025-06-30 0000002110 cik0000002110:C000024961Member country:AU 2025-06-30 0000002110 cik0000002110:C000024961Member country:NL 2025-06-30 0000002110 cik0000002110:C000024961Member oef:MaterialsSectorMember 2025-06-30 0000002110 cik0000002110:C000024961Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000024961Member us-gaap:EnergySectorMember 2025-06-30 0000002110 cik0000002110:C000024961Member country:JP 2025-06-30 0000002110 cik0000002110:C000024961Member country:GB 2025-06-30 0000002110 cik0000002110:C000024961Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000024961Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000024961Member oef:CommunicationsSectorMember 2025-06-30 0000002110 cik0000002110:C000024961Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000024961Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000024961Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000024961Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000024961Member cik0000002110:AutoTraderGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000024961Member cik0000002110:NiterraCoLtdMember 2025-06-30 0000002110 cik0000002110:C000024961Member cik0000002110:NemetschekSEMember 2025-06-30 0000002110 cik0000002110:C000024961Member cik0000002110:BelimoHoldingAGRegisteredSharesMember 2025-06-30 0000002110 cik0000002110:C000024961Member cik0000002110:CARGroupLtdMember 2025-06-30 0000002110 cik0000002110:C000024961Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000024961Member country:FR 2025-06-30 0000002110 cik0000002110:C000024961Member country:FI 2025-06-30 0000002110 cik0000002110:C000097733Member 2025-06-30 0000002110 cik0000002110:C000097733Member country:SE 2025-06-30 0000002110 cik0000002110:C000097733Member country:US 2025-06-30 0000002110 cik0000002110:C000097733Member country:AU 2025-06-30 0000002110 cik0000002110:C000097733Member country:NL 2025-06-30 0000002110 cik0000002110:C000097733Member country:FR 2025-06-30 0000002110 cik0000002110:C000097733Member country:FI 2025-06-30 0000002110 cik0000002110:C000097733Member us-gaap:EnergySectorMember 2025-06-30 0000002110 cik0000002110:C000097733Member country:JP 2025-06-30 0000002110 cik0000002110:C000097733Member country:GB 2025-06-30 0000002110 cik0000002110:C000097733Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000097733Member country:DE 2025-06-30 0000002110 cik0000002110:C000097733Member country:CH 2025-06-30 0000002110 cik0000002110:C000097733Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000097733Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000097733Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000097733Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000097733Member oef:MaterialsSectorMember 2025-06-30 0000002110 cik0000002110:C000097733Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000097733Member cik0000002110:NemetschekSEMember 2025-06-30 0000002110 cik0000002110:C000097733Member cik0000002110:BelimoHoldingAGRegisteredSharesMember 2025-06-30 0000002110 cik0000002110:C000097733Member cik0000002110:CARGroupLtdMember 2025-06-30 0000002110 cik0000002110:C000097733Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000097733Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000097733Member oef:CommunicationsSectorMember 2025-06-30 0000002110 cik0000002110:C000097733Member cik0000002110:HalmaPLCMember 2025-06-30 0000002110 cik0000002110:C000097733Member cik0000002110:RightmovePLCMember 2025-06-30 0000002110 cik0000002110:C000097733Member cik0000002110:FisherAndPaykelHealthcareCorpLtdMember 2025-06-30 0000002110 cik0000002110:C000097733Member cik0000002110:CTSEventimAGAndCoKGaAMember 2025-06-30 0000002110 cik0000002110:C000097733Member cik0000002110:AutoTraderGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000097733Member cik0000002110:NiterraCoLtdMember 2025-06-30 0000002110 cik0000002110:C000097733Member cik0000002110:CapcomCoLtdMember 2025-06-30 0000002110 cik0000002110:C000122739Member 2025-06-30 0000002110 cik0000002110:C000122739Member cik0000002110:AutoTraderGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000122739Member cik0000002110:NiterraCoLtdMember 2025-06-30 0000002110 cik0000002110:C000122739Member cik0000002110:NemetschekSEMember 2025-06-30 0000002110 cik0000002110:C000122739Member cik0000002110:BelimoHoldingAGRegisteredSharesMember 2025-06-30 0000002110 cik0000002110:C000122739Member cik0000002110:CARGroupLtdMember 2025-06-30 0000002110 cik0000002110:C000122739Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000122739Member cik0000002110:CapcomCoLtdMember 2025-06-30 0000002110 cik0000002110:C000122739Member cik0000002110:HalmaPLCMember 2025-06-30 0000002110 cik0000002110:C000122739Member cik0000002110:RightmovePLCMember 2025-06-30 0000002110 cik0000002110:C000122739Member cik0000002110:FisherAndPaykelHealthcareCorpLtdMember 2025-06-30 0000002110 cik0000002110:C000122739Member cik0000002110:CTSEventimAGAndCoKGaAMember 2025-06-30 0000002110 cik0000002110:C000122739Member country:AU 2025-06-30 0000002110 cik0000002110:C000122739Member country:NL 2025-06-30 0000002110 cik0000002110:C000122739Member country:FR 2025-06-30 0000002110 cik0000002110:C000122739Member country:FI 2025-06-30 0000002110 cik0000002110:C000122739Member country:GB 2025-06-30 0000002110 cik0000002110:C000122739Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000122739Member country:DE 2025-06-30 0000002110 cik0000002110:C000122739Member country:CH 2025-06-30 0000002110 cik0000002110:C000122739Member country:SE 2025-06-30 0000002110 cik0000002110:C000122739Member country:US 2025-06-30 0000002110 cik0000002110:C000122739Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000122739Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000122739Member oef:MaterialsSectorMember 2025-06-30 0000002110 cik0000002110:C000122739Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000122739Member us-gaap:EnergySectorMember 2025-06-30 0000002110 cik0000002110:C000122739Member country:JP 2025-06-30 0000002110 cik0000002110:C000122739Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000122739Member oef:CommunicationsSectorMember 2025-06-30 0000002110 cik0000002110:C000122739Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000122739Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000251060Member 2025-06-30 0000002110 cik0000002110:C000251060Member country:US 2025-06-30 0000002110 cik0000002110:C000251060Member country:AU 2025-06-30 0000002110 cik0000002110:C000251060Member country:NL 2025-06-30 0000002110 cik0000002110:C000251060Member country:FR 2025-06-30 0000002110 cik0000002110:C000251060Member country:FI 2025-06-30 0000002110 cik0000002110:C000251060Member country:JP 2025-06-30 0000002110 cik0000002110:C000251060Member country:GB 2025-06-30 0000002110 cik0000002110:C000251060Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000251060Member country:DE 2025-06-30 0000002110 cik0000002110:C000251060Member country:CH 2025-06-30 0000002110 cik0000002110:C000251060Member country:SE 2025-06-30 0000002110 cik0000002110:C000251060Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000251060Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000251060Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000251060Member oef:MaterialsSectorMember 2025-06-30 0000002110 cik0000002110:C000251060Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000251060Member us-gaap:EnergySectorMember 2025-06-30 0000002110 cik0000002110:C000251060Member cik0000002110:BelimoHoldingAGRegisteredSharesMember 2025-06-30 0000002110 cik0000002110:C000251060Member cik0000002110:CARGroupLtdMember 2025-06-30 0000002110 cik0000002110:C000251060Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000251060Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000251060Member oef:CommunicationsSectorMember 2025-06-30 0000002110 cik0000002110:C000251060Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000251060Member cik0000002110:RightmovePLCMember 2025-06-30 0000002110 cik0000002110:C000251060Member cik0000002110:FisherAndPaykelHealthcareCorpLtdMember 2025-06-30 0000002110 cik0000002110:C000251060Member cik0000002110:CTSEventimAGAndCoKGaAMember 2025-06-30 0000002110 cik0000002110:C000251060Member cik0000002110:AutoTraderGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000251060Member cik0000002110:NiterraCoLtdMember 2025-06-30 0000002110 cik0000002110:C000251060Member cik0000002110:NemetschekSEMember 2025-06-30 0000002110 cik0000002110:C000251060Member cik0000002110:CapcomCoLtdMember 2025-06-30 0000002110 cik0000002110:C000251060Member cik0000002110:HalmaPLCMember 2025-06-30 0000002110 cik0000002110:C000024970Member 2025-06-30 0000002110 cik0000002110:C000024970Member country:US 2025-06-30 0000002110 cik0000002110:C000024970Member country:IN 2025-06-30 0000002110 cik0000002110:C000024970Member country:DK 2025-06-30 0000002110 cik0000002110:C000024970Member oef:MaterialsSectorMember 2025-06-30 0000002110 cik0000002110:C000024970Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000024970Member cik0000002110:UnclassifiedSectorsMember 2025-06-30 0000002110 cik0000002110:C000024970Member country:JP 2025-06-30 0000002110 cik0000002110:C000024970Member country:GB 2025-06-30 0000002110 cik0000002110:C000024970Member country:FR 2025-06-30 0000002110 cik0000002110:C000024970Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000024970Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000024970Member oef:CommunicationsSectorMember 2025-06-30 0000002110 cik0000002110:C000024970Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000024970Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000024970Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000024970Member cik0000002110:ASMLHoldingNVMember 2025-06-30 0000002110 cik0000002110:C000024970Member cik0000002110:AdidasAGMember 2025-06-30 0000002110 cik0000002110:C000024970Member cik0000002110:PublicisGroupeSAMember 2025-06-30 0000002110 cik0000002110:C000024970Member cik0000002110:BTGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000024970Member cik0000002110:NestlSARegisteredSharesMember 2025-06-30 0000002110 cik0000002110:C000024970Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000024970Member cik0000002110:SchneiderElectricSEMember 2025-06-30 0000002110 cik0000002110:C000024970Member cik0000002110:CapcomCoLtdMember 2025-06-30 0000002110 cik0000002110:C000024970Member cik0000002110:ThreeiGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000024970Member cik0000002110:AirbusGroupSEMember 2025-06-30 0000002110 cik0000002110:C000024970Member cik0000002110:BankofIrelandGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000024970Member country:DE 2025-06-30 0000002110 cik0000002110:C000024970Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000024970Member country:CH 2025-06-30 0000002110 cik0000002110:C000024970Member country:NL 2025-06-30 0000002110 cik0000002110:C000024970Member country:IE 2025-06-30 0000002110 cik0000002110:C000024973Member 2025-06-30 0000002110 cik0000002110:C000024973Member country:DK 2025-06-30 0000002110 cik0000002110:C000024973Member cik0000002110:SchneiderElectricSEMember 2025-06-30 0000002110 cik0000002110:C000024973Member cik0000002110:CapcomCoLtdMember 2025-06-30 0000002110 cik0000002110:C000024973Member cik0000002110:ThreeiGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000024973Member cik0000002110:AirbusGroupSEMember 2025-06-30 0000002110 cik0000002110:C000024973Member cik0000002110:BankofIrelandGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000024973Member cik0000002110:ASMLHoldingNVMember 2025-06-30 0000002110 cik0000002110:C000024973Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000024973Member country:CH 2025-06-30 0000002110 cik0000002110:C000024973Member country:NL 2025-06-30 0000002110 cik0000002110:C000024973Member country:IE 2025-06-30 0000002110 cik0000002110:C000024973Member country:US 2025-06-30 0000002110 cik0000002110:C000024973Member country:IN 2025-06-30 0000002110 cik0000002110:C000024973Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000024973Member cik0000002110:UnclassifiedSectorsMember 2025-06-30 0000002110 cik0000002110:C000024973Member country:JP 2025-06-30 0000002110 cik0000002110:C000024973Member country:GB 2025-06-30 0000002110 cik0000002110:C000024973Member country:FR 2025-06-30 0000002110 cik0000002110:C000024973Member country:DE 2025-06-30 0000002110 cik0000002110:C000024973Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000024973Member oef:CommunicationsSectorMember 2025-06-30 0000002110 cik0000002110:C000024973Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000024973Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000024973Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000024973Member oef:MaterialsSectorMember 2025-06-30 0000002110 cik0000002110:C000024973Member cik0000002110:AdidasAGMember 2025-06-30 0000002110 cik0000002110:C000024973Member cik0000002110:PublicisGroupeSAMember 2025-06-30 0000002110 cik0000002110:C000024973Member cik0000002110:BTGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000024973Member cik0000002110:NestlSARegisteredSharesMember 2025-06-30 0000002110 cik0000002110:C000024973Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000024973Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000122746Member 2025-06-30 0000002110 cik0000002110:C000122746Member cik0000002110:BankofIrelandGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000122746Member cik0000002110:ASMLHoldingNVMember 2025-06-30 0000002110 cik0000002110:C000122746Member cik0000002110:AdidasAGMember 2025-06-30 0000002110 cik0000002110:C000122746Member cik0000002110:PublicisGroupeSAMember 2025-06-30 0000002110 cik0000002110:C000122746Member cik0000002110:BTGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000122746Member cik0000002110:NestlSARegisteredSharesMember 2025-06-30 0000002110 cik0000002110:C000122746Member country:IN 2025-06-30 0000002110 cik0000002110:C000122746Member country:DK 2025-06-30 0000002110 cik0000002110:C000122746Member cik0000002110:SchneiderElectricSEMember 2025-06-30 0000002110 cik0000002110:C000122746Member cik0000002110:CapcomCoLtdMember 2025-06-30 0000002110 cik0000002110:C000122746Member cik0000002110:ThreeiGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000122746Member cik0000002110:AirbusGroupSEMember 2025-06-30 0000002110 cik0000002110:C000122746Member country:DE 2025-06-30 0000002110 cik0000002110:C000122746Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000122746Member country:CH 2025-06-30 0000002110 cik0000002110:C000122746Member country:NL 2025-06-30 0000002110 cik0000002110:C000122746Member country:IE 2025-06-30 0000002110 cik0000002110:C000122746Member country:US 2025-06-30 0000002110 cik0000002110:C000122746Member oef:MaterialsSectorMember 2025-06-30 0000002110 cik0000002110:C000122746Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000122746Member cik0000002110:UnclassifiedSectorsMember 2025-06-30 0000002110 cik0000002110:C000122746Member country:JP 2025-06-30 0000002110 cik0000002110:C000122746Member country:GB 2025-06-30 0000002110 cik0000002110:C000122746Member country:FR 2025-06-30 0000002110 cik0000002110:C000122746Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000122746Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000122746Member oef:CommunicationsSectorMember 2025-06-30 0000002110 cik0000002110:C000122746Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000122746Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000122746Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000122746Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000122747Member 2025-06-30 0000002110 cik0000002110:C000122747Member country:CH 2025-06-30 0000002110 cik0000002110:C000122747Member country:NL 2025-06-30 0000002110 cik0000002110:C000122747Member country:IE 2025-06-30 0000002110 cik0000002110:C000122747Member country:US 2025-06-30 0000002110 cik0000002110:C000122747Member country:IN 2025-06-30 0000002110 cik0000002110:C000122747Member country:DK 2025-06-30 0000002110 cik0000002110:C000122747Member cik0000002110:UnclassifiedSectorsMember 2025-06-30 0000002110 cik0000002110:C000122747Member country:JP 2025-06-30 0000002110 cik0000002110:C000122747Member country:GB 2025-06-30 0000002110 cik0000002110:C000122747Member country:FR 2025-06-30 0000002110 cik0000002110:C000122747Member country:DE 2025-06-30 0000002110 cik0000002110:C000122747Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000122747Member oef:CommunicationsSectorMember 2025-06-30 0000002110 cik0000002110:C000122747Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000122747Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000122747Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000122747Member oef:MaterialsSectorMember 2025-06-30 0000002110 cik0000002110:C000122747Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000122747Member cik0000002110:PublicisGroupeSAMember 2025-06-30 0000002110 cik0000002110:C000122747Member cik0000002110:BTGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000122747Member cik0000002110:NestlSARegisteredSharesMember 2025-06-30 0000002110 cik0000002110:C000122747Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000122747Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000122747Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000122747Member cik0000002110:CapcomCoLtdMember 2025-06-30 0000002110 cik0000002110:C000122747Member cik0000002110:ThreeiGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000122747Member cik0000002110:AirbusGroupSEMember 2025-06-30 0000002110 cik0000002110:C000122747Member cik0000002110:BankofIrelandGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000122747Member cik0000002110:ASMLHoldingNVMember 2025-06-30 0000002110 cik0000002110:C000122747Member cik0000002110:AdidasAGMember 2025-06-30 0000002110 cik0000002110:C000122747Member cik0000002110:SchneiderElectricSEMember 2025-06-30 0000002110 cik0000002110:C000251061Member 2025-06-30 0000002110 cik0000002110:C000251061Member cik0000002110:SchneiderElectricSEMember 2025-06-30 0000002110 cik0000002110:C000251061Member country:CH 2025-06-30 0000002110 cik0000002110:C000251061Member country:NL 2025-06-30 0000002110 cik0000002110:C000251061Member country:IE 2025-06-30 0000002110 cik0000002110:C000251061Member country:US 2025-06-30 0000002110 cik0000002110:C000251061Member country:IN 2025-06-30 0000002110 cik0000002110:C000251061Member country:DK 2025-06-30 0000002110 cik0000002110:C000251061Member cik0000002110:UnclassifiedSectorsMember 2025-06-30 0000002110 cik0000002110:C000251061Member country:JP 2025-06-30 0000002110 cik0000002110:C000251061Member country:GB 2025-06-30 0000002110 cik0000002110:C000251061Member country:FR 2025-06-30 0000002110 cik0000002110:C000251061Member country:DE 2025-06-30 0000002110 cik0000002110:C000251061Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000251061Member oef:CommunicationsSectorMember 2025-06-30 0000002110 cik0000002110:C000251061Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000251061Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000251061Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000251061Member oef:MaterialsSectorMember 2025-06-30 0000002110 cik0000002110:C000251061Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000251061Member cik0000002110:PublicisGroupeSAMember 2025-06-30 0000002110 cik0000002110:C000251061Member cik0000002110:BTGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000251061Member cik0000002110:NestlSARegisteredSharesMember 2025-06-30 0000002110 cik0000002110:C000251061Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000251061Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000251061Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000251061Member cik0000002110:CapcomCoLtdMember 2025-06-30 0000002110 cik0000002110:C000251061Member cik0000002110:ThreeiGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000251061Member cik0000002110:AirbusGroupSEMember 2025-06-30 0000002110 cik0000002110:C000251061Member cik0000002110:BankofIrelandGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000251061Member cik0000002110:ASMLHoldingNVMember 2025-06-30 0000002110 cik0000002110:C000251061Member cik0000002110:AdidasAGMember 2025-06-30 0000002110 cik0000002110:C000024974Member 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:ColumbiaTotalReturnBondFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:ExchangeTradedFixedIncomeFundsMember 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:ColumbiaLargeCapIndexFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:ColumbiaHighYieldBondFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:ColumbiaDiversifiedFixedIncomeAllocationETFMember 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:FixedIncomeFundMember 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:EquityFundMember 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:ExchangeTradedEquityFundsMember 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:ColumbiaCorporateIncomeFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:ColumbiaUSTreasuryIndexFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:ColumbiaContrarianCoreFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:ColumbiaLargeCapEnhancedCoreFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:ColumbiaQualityIncomeFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024974Member cik0000002110:ColumbiaResearchEnhancedCoreETFMember 2025-06-30 0000002110 cik0000002110:C000024976Member 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:ColumbiaTotalReturnBondFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:ColumbiaCorporateIncomeFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:ColumbiaUSTreasuryIndexFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:ColumbiaContrarianCoreFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:ColumbiaLargeCapEnhancedCoreFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:ColumbiaQualityIncomeFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:ExchangeTradedEquityFundsMember 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:ExchangeTradedFixedIncomeFundsMember 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:ColumbiaResearchEnhancedCoreETFMember 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:ColumbiaLargeCapIndexFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:ColumbiaHighYieldBondFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:ColumbiaDiversifiedFixedIncomeAllocationETFMember 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:FixedIncomeFundMember 2025-06-30 0000002110 cik0000002110:C000024976Member cik0000002110:EquityFundMember 2025-06-30 0000002110 cik0000002110:C000024977Member 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:ColumbiaTotalReturnBondFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:ColumbiaCorporateIncomeFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:ColumbiaUSTreasuryIndexFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:ColumbiaDiversifiedFixedIncomeAllocationETFMember 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:FixedIncomeFundMember 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:EquityFundMember 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:ExchangeTradedEquityFundsMember 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:ExchangeTradedFixedIncomeFundsMember 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:ColumbiaContrarianCoreFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:ColumbiaLargeCapEnhancedCoreFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:ColumbiaQualityIncomeFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:ColumbiaResearchEnhancedCoreETFMember 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:ColumbiaLargeCapIndexFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000024977Member cik0000002110:ColumbiaHighYieldBondFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122750Member 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:ColumbiaTotalReturnBondFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:ExchangeTradedFixedIncomeFundsMember 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:ColumbiaLargeCapIndexFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:ColumbiaHighYieldBondFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:ColumbiaDiversifiedFixedIncomeAllocationETFMember 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:FixedIncomeFundMember 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:EquityFundMember 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:ExchangeTradedEquityFundsMember 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:ColumbiaCorporateIncomeFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:ColumbiaUSTreasuryIndexFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:ColumbiaContrarianCoreFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:ColumbiaLargeCapEnhancedCoreFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:ColumbiaQualityIncomeFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122750Member cik0000002110:ColumbiaResearchEnhancedCoreETFMember 2025-06-30 0000002110 cik0000002110:C000122751Member 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:ColumbiaTotalReturnBondFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:ExchangeTradedFixedIncomeFundsMember 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:ColumbiaLargeCapIndexFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:ColumbiaHighYieldBondFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:ColumbiaDiversifiedFixedIncomeAllocationETFMember 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:FixedIncomeFundMember 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:EquityFundMember 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:ExchangeTradedEquityFundsMember 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:ColumbiaCorporateIncomeFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:ColumbiaUSTreasuryIndexFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:ColumbiaContrarianCoreFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:ColumbiaLargeCapEnhancedCoreFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:ColumbiaQualityIncomeFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000122751Member cik0000002110:ColumbiaResearchEnhancedCoreETFMember 2025-06-30 0000002110 cik0000002110:C000251062Member 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:ColumbiaHighYieldBondFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:ColumbiaDiversifiedFixedIncomeAllocationETFMember 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:FixedIncomeFundMember 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:EquityFundMember 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:ExchangeTradedEquityFundsMember 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:ExchangeTradedFixedIncomeFundsMember 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:ColumbiaResearchEnhancedCoreETFMember 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:ColumbiaLargeCapIndexFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:ColumbiaTotalReturnBondFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:ColumbiaCorporateIncomeFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:ColumbiaUSTreasuryIndexFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:ColumbiaContrarianCoreFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:ColumbiaLargeCapEnhancedCoreFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000251062Member cik0000002110:ColumbiaQualityIncomeFundInstitutionalThreeClassMember 2025-06-30 0000002110 cik0000002110:C000103324Member 2025-06-30 0000002110 cik0000002110:C000103324Member cik0000002110:ElisSAMember 2025-06-30 0000002110 cik0000002110:C000103324Member country:ES 2025-06-30 0000002110 cik0000002110:C000103324Member country:CH 2025-06-30 0000002110 cik0000002110:C000103324Member country:AT 2025-06-30 0000002110 cik0000002110:C000103324Member country:SE 2025-06-30 0000002110 cik0000002110:C000103324Member country:IT 2025-06-30 0000002110 cik0000002110:C000103324Member country:IE 2025-06-30 0000002110 cik0000002110:C000103324Member country:BE 2025-06-30 0000002110 cik0000002110:C000103324Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000103324Member cik0000002110:UnclassifiedSectorsMember 2025-06-30 0000002110 cik0000002110:C000103324Member country:GB 2025-06-30 0000002110 cik0000002110:C000103324Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000103324Member country:FR 2025-06-30 0000002110 cik0000002110:C000103324Member country:DE 2025-06-30 0000002110 cik0000002110:C000103324Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000103324Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000103324Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000103324Member oef:CommunicationsSectorMember 2025-06-30 0000002110 cik0000002110:C000103324Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000103324Member us-gaap:EnergySectorMember 2025-06-30 0000002110 cik0000002110:C000103324Member cik0000002110:BuzziSpAMember 2025-06-30 0000002110 cik0000002110:C000103324Member cik0000002110:BancoComercialPortuguesSAMember 2025-06-30 0000002110 cik0000002110:C000103324Member cik0000002110:ChemringGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000103324Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000103324Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000103324Member oef:MaterialsSectorMember 2025-06-30 0000002110 cik0000002110:C000103324Member cik0000002110:CTSEventimAGAndCoKGaAMember 2025-06-30 0000002110 cik0000002110:C000103324Member cik0000002110:StorebrandASAMember 2025-06-30 0000002110 cik0000002110:C000103324Member cik0000002110:NexansSAMember 2025-06-30 0000002110 cik0000002110:C000103324Member cik0000002110:SafestoreHoldingsPLCMember 2025-06-30 0000002110 cik0000002110:C000103324Member cik0000002110:QuilterPLCMember 2025-06-30 0000002110 cik0000002110:C000103324Member cik0000002110:LondonMetricPropertyPLCMember 2025-06-30 0000002110 cik0000002110:C000103327Member 2025-06-30 0000002110 cik0000002110:C000103327Member oef:IndustrialSectorMember 2025-06-30 0000002110 cik0000002110:C000103327Member cik0000002110:ChemringGroupPLCMember 2025-06-30 0000002110 cik0000002110:C000103327Member cik0000002110:NexansSAMember 2025-06-30 0000002110 cik0000002110:C000103327Member cik0000002110:SafestoreHoldingsPLCMember 2025-06-30 0000002110 cik0000002110:C000103327Member cik0000002110:QuilterPLCMember 2025-06-30 0000002110 cik0000002110:C000103327Member cik0000002110:LondonMetricPropertyPLCMember 2025-06-30 0000002110 cik0000002110:C000103327Member cik0000002110:BuzziSpAMember 2025-06-30 0000002110 cik0000002110:C000103327Member cik0000002110:BancoComercialPortuguesSAMember 2025-06-30 0000002110 cik0000002110:C000103327Member country:IE 2025-06-30 0000002110 cik0000002110:C000103327Member country:BE 2025-06-30 0000002110 cik0000002110:C000103327Member country:ES 2025-06-30 0000002110 cik0000002110:C000103327Member cik0000002110:ElisSAMember 2025-06-30 0000002110 cik0000002110:C000103327Member cik0000002110:CTSEventimAGAndCoKGaAMember 2025-06-30 0000002110 cik0000002110:C000103327Member cik0000002110:StorebrandASAMember 2025-06-30 0000002110 cik0000002110:C000103327Member country:FR 2025-06-30 0000002110 cik0000002110:C000103327Member country:DE 2025-06-30 0000002110 cik0000002110:C000103327Member country:CH 2025-06-30 0000002110 cik0000002110:C000103327Member country:AT 2025-06-30 0000002110 cik0000002110:C000103327Member country:SE 2025-06-30 0000002110 cik0000002110:C000103327Member country:IT 2025-06-30 0000002110 cik0000002110:C000103327Member oef:InformationTechnologySectorMember 2025-06-30 0000002110 cik0000002110:C000103327Member us-gaap:EnergySectorMember 2025-06-30 0000002110 cik0000002110:C000103327Member oef:ConsumerStaplesSectorMember 2025-06-30 0000002110 cik0000002110:C000103327Member cik0000002110:UnclassifiedSectorsMember 2025-06-30 0000002110 cik0000002110:C000103327Member country:GB 2025-06-30 0000002110 cik0000002110:C000103327Member cik0000002110:OtherMember 2025-06-30 0000002110 cik0000002110:C000103327Member us-gaap:FinancialServicesSectorMember 2025-06-30 0000002110 cik0000002110:C000103327Member oef:MaterialsSectorMember 2025-06-30 0000002110 cik0000002110:C000103327Member us-gaap:RealEstateSectorMember 2025-06-30 0000002110 cik0000002110:C000103327Member oef:ConsumerDiscretionarySectorMember 2025-06-30 0000002110 cik0000002110:C000103327Member us-gaap:HealthcareSectorMember 2025-06-30 0000002110 cik0000002110:C000103327Member oef:CommunicationsSectorMember 2025-06-30 0000002110 cik0000002110:C000024954Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000024956Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000024957Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000122736Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000122737Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000251059Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000024958Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000024961Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000097733Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000122739Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000251060Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000024970Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000024973Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000122746Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000122747Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000251061Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000024974Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000024976Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000024977Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000122750Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000122751Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000251062Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000103324Member 2025-01-01 2025-06-30 0000002110 cik0000002110:C000103327Member 2025-01-01 2025-06-30 iso4217:USD xbrli:pure cik0000002110:Holding
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM
N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES
Investment Company Act file number
811-01829
Columbia Acorn Trust
(Exact name of registrant as specified in charter)

290 Congress Street
Boston, MA 02210
(Address of principal executive offices) (Zip code)

Daniel J. Beckman
c/o Columbia Management Investment Advisers, LLC
290 Congress Street
Boston, MA 02210

Ryan C. Larrenaga, Esq.
c/o Columbia Management Investment Advisers, LLC
290 Congress Street
Boston, MA 02210

(Name and address of agent for service)
Registrant's telephone number, including area code:
(800)
 
345-6611
Date of fiscal year end:
Last Day of
 
December
Date of reporting period:
June 30, 2025
Form N-CSR is to be used by management investment companies to file reports with the Commission not later than 10 days after the transmission to stockholders of any report that is required to be transmitted to stockholders under Rule 30e-1 under the Investment Company Act of 1940 (17 CFR 270.30e-1). The Commission may use the information provided on Form N-CSR in its regulatory, disclosure review, inspection, and policymaking roles.
A registrant is required to disclose the information specified by Form N-CSR, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-CSR unless the Form displays a currently valid Office of Management and Budget ("OMB") control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to Secretary, Securities and Exchange Commission, 100
 
F Street, NE, Washington, DC 20549. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. § 3507.
Item 1. Reports to Stockholders
Columbia Acorn
®
Fund
Class A / LACAX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn
®
Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class A
$
51
1.05
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
2,461,733,489
Total number of portfolio holdings
100
Portfolio turnover for the reporting period
43%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net
assets
. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
SPX Technologies, Inc.2.6
%
Churchill Downs, Inc.2.4
%
GCM Grosvenor, Inc., Class A2.4
%
Parsons Corp.2.4
%
Curtiss-Wright Corp.2.3
%
Wingstop, Inc.2.2
%
Five Below, Inc.2.2
%
Carlyle Group, Inc. (The)2.1
%
HealthEquity, Inc.2.1
%
Colliers International Group, Inc.2.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its
prospectus
, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn
®
Fund | Class A
 
|
 
SSR110_01_(08/25)
Columbia Acorn
®
Fund
Class C / LIACX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn
®
Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class C
$
87
1.80
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
2,461,733,489
Total number of portfolio holdings
100
Portfolio turnover for the reporting period
43%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net
assets
. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
SPX Technologies, Inc.2.6
%
Churchill Downs, Inc.2.4
%
GCM Grosvenor, Inc., Class A2.4
%
Parsons Corp.2.4
%
Curtiss-Wright Corp.2.3
%
Wingstop, Inc.2.2
%
Five Below, Inc.2.2
%
Carlyle Group, Inc. (The)2.1
%
HealthEquity, Inc.2.1
%
Colliers International Group, Inc.2.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn
®
Fund | Class C
 
|
 
SSR110_04_(08/25)
Columbia Acorn
®
Fund
Institutional Class / ACRNX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn
®
Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional Class
$
39
0.80
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
2,461,733,489
Total number of portfolio holdings
100
Portfolio turnover for the reporting period
43%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net
assets
. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
SPX Technologies, Inc.2.6
%
Churchill Downs, Inc.2.4
%
GCM Grosvenor, Inc., Class A2.4
%
Parsons Corp.2.4
%
Curtiss-Wright Corp.2.3
%
Wingstop, Inc.2.2
%
Five Below, Inc.2.2
%
Carlyle Group, Inc. (The)2.1
%
HealthEquity, Inc.2.1
%
Colliers International Group, Inc.2.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn
®
Fund | Institutional Class
 
|
 
SSR110_08_(08/25)
Columbia Acorn
®
Fund
Institutional 2 Class / CRBRX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn
®
Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 2 Class
$
37
0.77
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
2,461,733,489
Total number of portfolio holdings
100
Portfolio turnover for the reporting period
43%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net
assets
. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
SPX Technologies, Inc.2.6
%
Churchill Downs, Inc.2.4
%
GCM Grosvenor, Inc., Class A2.4
%
Parsons Corp.2.4
%
Curtiss-Wright Corp.2.3
%
Wingstop, Inc.2.2
%
Five Below, Inc.2.2
%
Carlyle Group, Inc. (The)2.1
%
HealthEquity, Inc.2.1
%
Colliers International Group, Inc.2.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn
®
Fund | Institutional 2 Class
 
|
 
SSR110_15_(08/25)
Columbia Acorn
®
Fund
Institutional 3 Class / CRBYX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn
®
Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 3 Class
$
35
0.72
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
2,461,733,489
Total number of portfolio holdings
100
Portfolio turnover for the reporting period
43%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net
assets
. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
SPX Technologies, Inc.2.6
%
Churchill Downs, Inc.2.4
%
GCM Grosvenor, Inc., Class A2.4
%
Parsons Corp.2.4
%
Curtiss-Wright Corp.2.3
%
Wingstop, Inc.2.2
%
Five Below, Inc.2.2
%
Carlyle Group, Inc. (The)2.1
%
HealthEquity, Inc.2.1
%
Colliers International Group, Inc.2.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn
®
Fund | Institutional 3 Class
 
|
 
SSR110_17_(08/25)
Columbia Acorn
®
Fund
Class S / ACRSX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn
®
Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class S
$
39
0.80
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
2,461,733,489
Total number of portfolio holdings
100
Portfolio turnover for the reporting period
43%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise
noted
. The Fund's portfolio composition is subject to change.
Top Holdings
SPX Technologies, Inc.2.6
%
Churchill Downs, Inc.2.4
%
GCM Grosvenor, Inc., Class A2.4
%
Parsons Corp.2.4
%
Curtiss-Wright Corp.2.3
%
Wingstop, Inc.2.2
%
Five Below, Inc.2.2
%
Carlyle Group, Inc. (The)2.1
%
HealthEquity, Inc.2.1
%
Colliers International Group, Inc.2.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR
code
below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn
®
Fund | Class S
 
|
 
SSR110_16_(08/25)
Columbia Acorn International
®
Class A / LAIAX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn International
®
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class A
$
66
1.22
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
925,680,060
Total number of portfolio holdings
67
Portfolio turnover for the reporting period
9%
Graphical Representation of Fund
 
Holdings
The tables below show the inv
es
tment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Capcom Co., Ltd.3.2
%
Halma PLC2.8
%
Rightmove PLC2.7
%
Fisher & Paykel Healthcare Corp., Ltd.2.6
%
CTS Eventim AG & Co. KGaA2.6
%
Auto Trader Group PLC2.5
%
Niterra Co., Ltd.
2.4
%
Nemetschek SE2.3
%
Belimo Holding AG, Registered Shares2.3
%
CAR Group Ltd.2.3
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Availability of
Additional
Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn International
®
| Class A
 
|
 
SSR111_01_(08/25)
Columbia Acorn International
®
Institutional Class / ACINX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn International
®
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional Class
$
52
0.96
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
925,680,060
Total number of portfolio holdings
67
Portfolio turnover for the reporting period
9%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Capcom Co., Ltd.3.2
%
Halma PLC2.8
%
Rightmove PLC2.7
%
Fisher & Paykel Healthcare Corp., Ltd.2.6
%
CTS Eventim AG & Co. KGaA2.6
%
Auto Trader Group PLC2.5
%
Niterra Co., Ltd.
2.4
%
Nemetschek SE2.3
%
Belimo Holding AG, Registered Shares2.3
%
CAR Group Ltd.2.3
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Availability of Additional
Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn International
®
| Institutional Class
 
|
 
SSR111_08_(08/25)
Columbia Acorn International
®
Institutional 2 Class / CAIRX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn International
®
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 2 Class
$
48
0.90
%
(a)
(a)
Annualized.
Key
Fund
Statistics
Fund net assets
$
925,680,060
Total number of portfolio holdings
67
Portfolio turnover for the reporting period
9%
Graphical Representation of Fund
 
Holdin
gs
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Capcom Co., Ltd.3.2
%
Halma PLC2.8
%
Rightmove PLC2.7
%
Fisher & Paykel Healthcare Corp., Ltd.2.6
%
CTS Eventim AG & Co. KGaA2.6
%
Auto Trader Group PLC2.5
%
Niterra Co., Ltd.
2.4
%
Nemetschek SE2.3
%
Belimo Holding AG, Registered Shares2.3
%
CAR
Group
Ltd.
2.3
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
Columbia Acorn International
®
| Institutional 2 Class
 
|
 
SSR111_15_(08/25)
Columbia Acorn International
®
Institutional 3 Class / CCYIX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn International
®
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 3 Class
$
46
0.85
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
925,680,060
Total number of portfolio holdings
67
Portfolio turnover for the reporting period
9%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Capcom Co., Ltd.3.2
%
Halma PLC2.8
%
Rightmove PLC2.7
%
Fisher & Paykel Healthcare Corp., Ltd.2.6
%
CTS Eventim AG & Co. KGaA2.6
%
Auto Trader Group PLC2.5
%
Niterra Co., Ltd.
2.4
%
Nemetschek SE2.3
%
Belimo Holding AG, Registered Shares2.3
%
CAR Group Ltd.2.3
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Availability
of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn International
®
| Institutional 3 Class
 
|
 
SSR111_17_(08/25)
Columbia Acorn International
®
Class S / CCIDX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn International
®
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class S
$
52
0.97
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
925,680,060
Total number of portfolio holdings
67
Portfolio turnover for the reporting period
9%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Capcom Co., Ltd.3.2
%
Halma PLC2.8
%
Rightmove PLC2.7
%
Fisher & Paykel Healthcare Corp., Ltd.2.6
%
CTS Eventim AG & Co. KGaA2.6
%
Auto Trader Group PLC2.5
%
Niterra Co., Ltd.
2.4
%
Nemetschek SE2.3
%
Belimo Holding AG, Registered Shares2.3
%
CAR Group Ltd.2.3
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Availability of
Additional
Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn International
®
| Class S
 
|
 
SSR111_16_(08/25)
Columbia Acorn International Select
SM
Class A / LAFAX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn International Select
SM
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class A
$
62
1.16
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
203,521,015
Total number of portfolio holdings
59
Portfolio turnover for the reporting period
9%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless
otherwise
noted. The Fund's portfolio composition is subject to change.
Top Holdings
Schneider Electric SE3.9
%
Capcom Co., Ltd.3.9
%
3i Group PLC3.2
%
Airbus Group SE2.7
%
Bank of Ireland Group PLC2.7
%
ASML Holding NV2.6
%
Adidas AG2.6
%
Publicis Groupe SA2.5
%
BT Group PLC2.4
%
Nestlé SA, Registered Shares2.3
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund,
including
its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn International Select
SM
| Class A
 
|
 
SSR112_01_(08/25)
Columbia Acorn International Select
SM
Institutional Class / ACFFX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn International Select
SM
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional Class
$
48
0.91
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
203,521,015
Total number of portfolio holdings
59
Portfolio turnover for the reporting period
9%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Schneider Electric SE3.9
%
Capcom Co., Ltd.3.9
%
3i Group PLC3.2
%
Airbus Group SE2.7
%
Bank of Ireland Group PLC2.7
%
ASML Holding NV2.6
%
Adidas AG2.6
%
Publicis Groupe SA2.5
%
BT Group PLC2.4
%
Nestlé SA, Registered Shares2.3
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Availability of
Additional
Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn International Select
SM
| Institutional Class
 
|
 
SSR112_08_(08/25)
Columbia Acorn International Select
SM
Institutional 2 Class / CRIRX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn International Select
SM
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 2 Class
$
41
0.77
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
203,521,015
Total number of portfolio holdings
59
Portfolio turnover for the reporting period
9%
Graphical Representation of
Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Schneider Electric SE3.9
%
Capcom Co., Ltd.3.9
%
3i Group PLC3.2
%
Airbus Group SE2.7
%
Bank of Ireland Group PLC2.7
%
ASML Holding NV2.6
%
Adidas AG2.6
%
Publicis Groupe SA2.5
%
BT Group PLC2.4
%
Nestlé SA, Registered Shares2.3
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn International Select
SM
| Institutional 2 Class
 
|
 
SSR112_15_(08/25)
Columbia Acorn International Select
SM
Institutional 3 Class / CSIRX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn International Select
SM
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 3 Class
$
38
0.71
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
203,521,015
Total number of portfolio holdings
59
Portfolio turnover for the reporting period
9%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Schneider Electric SE3.9
%
Capcom Co., Ltd.3.9
%
3i Group PLC3.2
%
Airbus Group SE2.7
%
Bank of Ireland Group PLC2.7
%
ASML Holding NV2.6
%
Adidas AG2.6
%
Publicis Groupe SA2.5
%
BT Group PLC2.4
%
Nestlé SA, Registered Shares2.3
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website
included
at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn International Select
SM
| Institutional 3 Class
 
|
 
SSR112_17_(08/25)
Columbia Acorn International Select
SM
Class S / ACFEX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn International Select
SM
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class S
$
48
0.91
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
203,521,015
Total number of portfolio holdings
59
Portfolio turnover for the reporting period
9%
Graphical
Representation
of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Schneider Electric SE3.9
%
Capcom Co., Ltd.3.9
%
3i Group PLC3.2
%
Airbus Group SE2.7
%
Bank of Ireland Group PLC2.7
%
ASML Holding NV2.6
%
Adidas AG2.6
%
Publicis Groupe SA2.5
%
BT Group PLC2.4
%
Nestlé SA, Registered Shares2.3
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Availability of
Additional
Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn International Select
SM
| Class S
 
|
 
SSR112_16_(08/25)
Columbia Thermostat Fund
SM
Class A / CTFAX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Thermostat Fund
SM
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class A
$
25
0.49
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
1,248,605,013
Total number of portfolio holdings
12
Portfolio turnover for the reporting period
60%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Columbia Total Return Bond Fund, Institutional 3 Class14.9
%
Columbia Corporate Income Fund, Institutional 3 Class11.9
%
Columbia U.S. Treasury Index Fund, Institutional 3 Class11.9
%
Columbia Contrarian Core Fund, Institutional 3 Class10.1
%
Columbia Large Cap Enhanced Core Fund, Institutional 3 Class10.0
%
Columbia Quality Income Fund, Institutional 3 Class9.0
%
Columbia Research Enhanced Core ETF8.1
%
Columbia Large Cap Index Fund, Institutional 3 Class8.0
%
Columbia High Yield Bond Fund, Institutional 3 Class5.9
%
Columbia Diversified Fixed Income Allocation ETF6.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Availability of Additional Information
For additional information about the Fund, including its p
rosp
ectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Thermostat Fund
SM
| Class A
 
|
 
SSR235_01_(08/25)
Columbia Thermostat Fund
SM
Class C / CTFDX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Thermostat Fund
SM
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class C
$
64
1.24
%
(a)
(a)
Annualized.
Key Fund
Statistics
Fund net assets
$
1,248,605,013
Total number of portfolio holdings
12
Portfolio turnover for the reporting period
60%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund repre
se
nted as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Columbia Total Return Bond Fund, Institutional 3 Class14.9
%
Columbia Corporate Income Fund, Institutional 3 Class11.9
%
Columbia U.S. Treasury Index Fund, Institutional 3 Class11.9
%
Columbia Contrarian Core Fund, Institutional 3 Class10.1
%
Columbia Large Cap Enhanced Core Fund, Institutional 3 Class10.0
%
Columbia Quality Income Fund, Institutional 3 Class9.0
%
Columbia Research Enhanced Core ETF8.1
%
Columbia Large Cap Index Fund, Institutional 3 Class8.0
%
Columbia High Yield Bond Fund, Institutional 3 Class5.9
%
Columbia Diversified Fixed Income Allocation ETF6.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Thermostat Fund
SM
| Class C
 
|
 
SSR235_04_(08/25)
Columbia Thermostat Fund
SM
Institutional Class / COTZX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Thermostat Fund
SM
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional Class
$
12
0.24
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
1,248,605,013
Total number of portfolio holdings
12
Portfolio turnover for the reporting period
60%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund repre
se
nted as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Columbia Total Return Bond Fund, Institutional 3 Class14.9
%
Columbia Corporate Income Fund, Institutional 3 Class11.9
%
Columbia U.S. Treasury Index Fund, Institutional 3 Class11.9
%
Columbia Contrarian Core Fund, Institutional 3 Class10.1
%
Columbia Large Cap Enhanced Core Fund, Institutional 3 Class10.0
%
Columbia Quality Income Fund, Institutional 3 Class9.0
%
Columbia Research Enhanced Core ETF8.1
%
Columbia Large Cap Index Fund, Institutional 3 Class8.0
%
Columbia High Yield Bond Fund, Institutional 3 Class5.9
%
Columbia Diversified Fixed Income Allocation ETF6.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Availability of Additional Information
For additional information about the Fund, including its p
rospec
tus, financial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Thermostat Fund
SM
| Institutional Class
 
|
 
SSR235_08_(08/25)
Columbia Thermostat Fund
SM
Institutional 2 Class / CQTRX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Thermostat Fund
SM
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 2 Class
$
10
0.19
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
1,248,605,013
Total number of portfolio holdings
12
Portfolio turnover for the reporting period
60%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Columbia Total Return Bond Fund, Institutional 3 Class14.9
%
Columbia Corporate Income Fund, Institutional 3 Class11.9
%
Columbia U.S. Treasury Index Fund, Institutional 3 Class11.9
%
Columbia Contrarian Core Fund, Institutional 3 Class10.1
%
Columbia Large Cap Enhanced Core Fund, Institutional 3 Class10.0
%
Columbia Quality Income Fund, Institutional 3 Class9.0
%
Columbia Research Enhanced Core ETF8.1
%
Columbia Large Cap Index Fund, Institutional 3 Class8.0
%
Columbia High Yield Bond Fund, Institutional 3 Class5.9
%
Columbia Diversified Fixed Income Allocation ETF6.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial information, holdings, federal tax infor
ma
tion and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Thermostat Fund
SM
| Institutional 2 Class
 
|
 
SSR235_15_(08/25)
Columbia Thermostat Fund
SM
Institutional 3 Class / CYYYX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Thermostat Fund
SM
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 3 Class
$
7
0.14
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
1,248,605,013
Total number of portfolio holdings
12
Portfolio turnover for the reporting period
60%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Columbia Total Return Bond Fund, Institutional 3 Class14.9
%
Columbia Corporate Income Fund, Institutional 3 Class11.9
%
Columbia U.S. Treasury Index Fund, Institutional 3 Class11.9
%
Columbia Contrarian Core Fund, Institutional 3 Class10.1
%
Columbia Large Cap Enhanced Core Fund, Institutional 3 Class10.0
%
Columbia Quality Income Fund, Institutional 3 Class9.0
%
Columbia Research Enhanced Core ETF8.1
%
Columbia Large Cap Index Fund, Institutional 3 Class8.0
%
Columbia High Yield Bond Fund, Institutional 3 Class5.9
%
Columbia Diversified Fixed Income Allocation ETF6.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial info
rmatio
n, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Thermostat Fund
SM
| Institutional 3 Class
 
|
 
SSR235_17_(08/25)
Columbia Thermostat Fund
SM
Class S / COTDX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Thermostat Fund
SM
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class S
$
12
0.24
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
1,248,605,013
Total number of portfolio holdings
12
Portfolio turnover for the reporting period
60%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Columbia Total Return Bond Fund, Institutional 3 Class14.9
%
Columbia Corporate Income Fund, Institutional 3 Class11.9
%
Columbia U.S. Treasury Index Fund, Institutional 3 Class11.9
%
Columbia Contrarian Core Fund, Institutional 3 Class10.1
%
Columbia Large Cap Enhanced Core Fund, Institutional 3 Class10.0
%
Columbia Quality Income Fund, Institutional 3 Class9.0
%
Columbia Research Enhanced Core ETF8.1
%
Columbia Large Cap Index Fund, Institutional 3 Class8.0
%
Columbia High Yield Bond Fund, Institutional 3 Class5.9
%
Columbia Diversified Fixed Income Allocation ETF6.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, fin
an
cial information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Thermostat Fund
SM
| Class S
 
|
 
SSR235_16_(08/25)
Columbia Acorn European Fund
SM
Class A / CAEAX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn European Fund
SM
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class A
$
75
1.37
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
41,167,250
Total number of portfolio holdings
91
Portfolio turnover for the reporting period
53%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the ta
ble
s unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Elis SA2.9
%
CTS Eventim AG & Co. KGaA2.3
%
Storebrand ASA2.3
%
Nexans SA2.2
%
Safestore Holdings PLC2.2
%
Quilter PLC2.1
%
LondonMetric Property PLC2.0
%
Buzzi SpA1.8
%
Banco Comercial Portugues SA1.8
%
Chemring Group PLC1.7
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its prospectus, financial i
nf
ormation, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn European Fund
SM
| Class A
 
|
 
SSR109_01_(08/25)
Columbia Acorn European Fund
SM
Institutional Class / CAEZX
FundLogo
Semi-Annual Shareholder Report | June 30, 2025
This semi-annual shareholder report contains important information about Columbia Acorn European Fund
SM
(the Fund) for the period of January 1, 2025 to June 30, 2025.
You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional Class
$
62
1.13
%
(a)
(a)
Annualized.
Key Fund Statistics
Fund net assets
$
41,167,250
Total number of portfolio holdings
91
Portfolio turnover for the reporting period
53%
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Elis SA2.9
%
CTS Eventim AG & Co. KGaA2.3
%
Storebrand ASA2.3
%
Nexans SA2.2
%
Safestore Holdings PLC2.2
%
Quilter PLC2.1
%
LondonMetric Property PLC2.0
%
Buzzi SpA1.8
%
Banco Comercial Portugues SA1.8
%
Chemring Group PLC1.7
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Availability of Additional Information
For additional information about the Fund, including its p
rosp
ectus, finan
cia
l information, holdings, federal tax information and proxy voting information, visit the Fund’s website included at the beginning of this report or scan the QR code below.
TSR - QR Code
The Fund is distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC. Columbia Threadneedle Investments
®
(Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved.
© 2025 Columbia Management Investment Advisers, LLC.
 
Not FDIC or NCUA Insured • No Financial Institution Guarantee • May Lose Value
 
Columbia Acorn European Fund
SM
| Institutional Class
 
|
 
SSR109_08_(08/25)

Item 2. Code of Ethics.

Not applicable.


Item 3. Audit Committee Financial Expert.

Not applicable.


Item 4. Principal Accountant Fees and Services.

Not applicable.


Item 5. Audit Committee of Listed Registrants.

Not applicable.


Item 6. Investments.

(a) The registrant’s “Schedule I – Investments in securities of unaffiliated issuers” (as set forth in 17 CFR 210.12-12) is included in Item 7 of this Form N-CSR.

(b) Not applicable.


Item 7. Financial Statements and Financial Highlights for Open-End Management Investment Companies.


  
Semi-Annual Financial Statements and Additional Information
June 30, 2025 (Unaudited)
Columbia Acorn® Fund
Columbia Acorn International®
Columbia Acorn International SelectSM
Columbia Thermostat FundSM
Columbia Acorn European FundSM
  
Not FDIC or NCUA Insured
No Financial Institution Guarantee
May Lose Value

Table of Contents
 
3
22
26
28
34
52
67
68
Columbia Acorn Trust | 2025

Portfolio of Investments
Columbia Acorn® Fund, June 30, 2025 (Unaudited)
(Percentages represent value of investments compared to net assets)
Investments in securities
 
 
Common Stocks 98.3%
Issuer
Shares
Value ($)
Consumer Discretionary 16.8%
Automobile Components 3.2%
Dorman Products, Inc.(a)
261,863
32,122,734
Modine Manufacturing Co.(a)
489,621
48,227,669
Total
80,350,403
Diversified Consumer Services 1.8%
Bright Horizons Family Solutions, Inc.(a)
354,003
43,751,231
Hotels, Restaurants & Leisure 5.9%
Churchill Downs, Inc.
583,919
58,975,819
Portillo’s, Inc., Class A(a)
1,994,406
23,274,718
Wingstop, Inc.
160,207
53,948,105
Xponential Fitness, Inc., Class A(a)
1,137,279
8,518,220
Total
144,716,862
Household Durables 3.7%
Cavco Industries, Inc.(a)
77,013
33,456,757
SharkNinja, Inc.(a)
104,079
10,302,780
TopBuild Corp.(a)
146,839
47,537,658
Total
91,297,195
Specialty Retail 2.2%
Five Below, Inc.(a)
407,802
53,495,466
Total Consumer Discretionary
413,611,157
Consumer Staples 4.8%
Consumer Staples Distribution & Retail 2.7%
BJ’s Wholesale Club Holdings, Inc.(a)
393,552
42,436,712
Sprouts Farmers Market, Inc.(a)
146,710
24,154,335
Total
66,591,047
Household Products 1.1%
WD-40 Co.
124,079
28,301,179
Personal Care Products 1.0%
elf Beauty, Inc.(a)
194,996
24,265,302
Total Consumer Staples
119,157,528
Energy 2.1%
Energy Equipment & Services 1.1%
TechnipFMC PLC
775,723
26,715,900
Common Stocks (continued)
Issuer
Shares
Value ($)
Oil, Gas & Consumable Fuels 1.0%
Antero Resources Corp.(a)
606,238
24,419,267
Total Energy
51,135,167
Financials 9.6%
Banks 1.5%
Lakeland Financial Corp.
232,728
14,301,136
Western Alliance Bancorp
291,874
22,760,334
Total
37,061,470
Capital Markets 5.5%
Blue Owl Capital, Inc.
1,267,936
24,357,051
Carlyle Group, Inc. (The)
1,031,465
53,017,301
GCM Grosvenor, Inc., Class A(b)
5,088,526
58,823,360
Total
136,197,712
Insurance 2.6%
Oscar Health, Inc., Class A(a)
610,688
13,093,151
Ryan Specialty Holdings, Inc., Class A
744,905
50,646,091
Total
63,739,242
Total Financials
236,998,424
Health Care 20.0%
Biotechnology 6.0%
Absci Corp.(a),(c)
2,018,380
5,187,237
BridgeBio Pharma, Inc.(a)
283,462
12,239,889
Crinetics Pharmaceuticals, Inc.(a)
148,722
4,277,245
Exact Sciences Corp.(a)
904,095
48,043,608
Insmed, Inc.(a)
344,065
34,626,702
Natera, Inc.(a)
80,221
13,552,536
Nuvalent, Inc., Class A(a)
124,391
9,491,033
Revolution Medicines, Inc.(a)
159,029
5,850,677
Sarepta Therapeutics, Inc.(a)
292,945
5,009,359
Vaxcyte, Inc.(a)
153,523
4,991,033
Viking Therapeutics, Inc.(a)
209,891
5,562,111
Total
148,831,430
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
3

Portfolio of Investments  (continued)
Columbia Acorn® Fund, June 30, 2025 (Unaudited)
Common Stocks (continued)
Issuer
Shares
Value ($)
Health Care Equipment & Supplies 5.9%
Glaukos Corp.(a)
423,198
43,712,121
Integer Holdings Corp.(a)
248,972
30,616,087
iRhythm Technologies, Inc.(a)
65,279
10,050,355
Masimo Corp.(a)
250,998
42,222,884
Penumbra, Inc.(a)
76,995
19,759,227
Total
146,360,674
Health Care Providers & Services 4.6%
Alignment Healthcare, Inc.(a)
894,226
12,519,164
Encompass Health Corp.
315,858
38,733,666
HealthEquity, Inc.(a)
493,029
51,649,718
Pennant Group, Inc. (The)(a)
341,322
10,188,462
Total
113,091,010
Life Sciences Tools & Services 3.0%
Adaptive Biotechnologies Corp.(a)
622,888
7,256,645
BioLife Solutions, Inc.(a)
838,795
18,067,644
Bio-Techne Corp.
917,224
47,191,175
DNA Script(a),(d),(e),(f)
1,139
102,062
Total
72,617,526
Pharmaceuticals 0.5%
Corcept Therapeutics, Inc.(a)
77,397
5,680,940
Structure Therapeutics, Inc., ADR(a)
303,615
6,296,975
Total
11,977,915
Total Health Care
492,878,555
Industrials 25.5%
Aerospace & Defense 5.8%
Aerovironment, Inc.(a)
142,748
40,676,042
Axon Enterprise, Inc.(a)
14,306
11,844,510
Curtiss-Wright Corp.
113,763
55,578,914
Kratos Defense & Security Solutions, Inc.(a)
297,698
13,828,072
Moog, Inc., Class A
110,160
19,935,655
Total
141,863,193
Building Products 1.0%
Janus International Group, Inc.(a)
2,969,730
24,173,602
Commercial Services & Supplies 1.4%
VSE Corp.
261,373
34,234,635
Common Stocks (continued)
Issuer
Shares
Value ($)
Construction & Engineering 3.0%
MYR Group, Inc.(a)
146,831
26,642,485
Sterling Infrastructure, Inc.(a)
203,718
47,003,854
Total
73,646,339
Electrical Equipment 0.8%
Atkore, Inc.
125,411
8,847,746
Bloom Energy Corp., Class A(a)
426,954
10,212,740
Total
19,060,486
Machinery 4.9%
Esab Corp.
221,487
26,700,258
Mueller Water Products, Inc., Class A
1,271,817
30,574,481
SPX Technologies, Inc.(a)
386,249
64,766,232
Total
122,040,971
Marine Transportation 1.4%
Matson, Inc.
312,353
34,780,506
Professional Services 4.3%
Alight, Inc., Class A
1,769,561
10,015,715
Parsons Corp.(a)
809,779
58,117,839
Paylocity Holding Corp.(a)
203,241
36,825,237
Total
104,958,791
Trading Companies & Distributors 2.9%
Applied Industrial Technologies, Inc.
140,277
32,607,389
FTAI Aviation Ltd.
345,298
39,723,082
Total
72,330,471
Total Industrials
627,088,994
Information Technology 17.4%
Electronic Equipment, Instruments & Components 3.2%
Celestica, Inc.(a)
250,074
39,039,052
Coherent Corp.(a)
264,426
23,589,443
Ingram Micro Holding Corp.(c)
723,453
15,076,761
Total
77,705,256
IT Services 1.1%
Globant SA(a)
304,490
27,659,872
The accompanying Notes to Financial Statements are an integral part of this statement.
4
Columbia Acorn Trust  | 2025

Portfolio of Investments  (continued)
Columbia Acorn® Fund, June 30, 2025 (Unaudited)
Common Stocks (continued)
Issuer
Shares
Value ($)
Semiconductors & Semiconductor Equipment 1.8%
Lattice Semiconductor Corp.(a)
411,552
20,161,932
Marvell Technology, Inc.
161,778
12,521,617
Rigetti Computing, Inc.(a),(c)
171,075
2,028,950
Semtech Corp.(a)
184,070
8,308,920
Total
43,021,419
Software 11.1%
Alkami Technology, Inc.(a)
603,008
18,174,661
Atlassian Corp., Class A(a)
56,849
11,545,463
Braze, Inc., Class A(a)
332,711
9,349,179
Clearwater Analytics Holdings, Inc., Class A(a)
719,319
15,774,666
CyberArk Software Ltd.(a)
52,506
21,363,641
Dynatrace, Inc.(a)
493,540
27,248,343
Gen Digital, Inc.
847,672
24,921,557
Gitlab, Inc., Class A(a)
402,623
18,162,324
Monday.com Ltd.(a)
81,086
25,499,925
SailPoint, Inc.(a)
99,469
2,273,861
Sprout Social, Inc., Class A(a)
555,500
11,615,505
SPS Commerce, Inc.(a)
141,318
19,231,967
Varonis Systems, Inc.(a)
263,448
13,369,986
Vertex, Inc.(a)
442,990
15,653,052
Workiva, Inc., Class A(a)
213,700
14,627,765
Zeta Global Holdings Corp., Class A(a)
895,992
13,878,916
Zscaler, Inc.(a)
33,886
10,638,171
Total
273,328,982
Common Stocks (continued)
Issuer
Shares
Value ($)
Technology Hardware, Storage & Peripherals 0.2%
IonQ, Inc.(a),(c)
128,665
5,528,735
Total Information Technology
427,244,264
Real Estate 2.1%
Real Estate Management & Development 2.1%
Colliers International Group, Inc.(c)
393,339
51,346,473
Total Real Estate
51,346,473
Total Common Stocks
(Cost $2,086,906,229)
2,419,460,562
 
Exchange-Traded Equity Funds 1.1%
 
Shares
Value ($)
Sector 1.1%
SPDR S&P Biotech ETF(c)
324,433
26,905,229
Total Exchange-Traded Equity Funds
(Cost $26,047,989)
26,905,229
 
Money Market Funds 3.4%
 
 
 
Columbia Short-Term Cash Fund, 4.473%(b),(g)
21,453,808
21,449,517
Dreyfus Government Cash Management Fund,
Institutional Shares, 4.209%(g),(h)
61,863,077
61,863,077
Total Money Market Funds
(Cost $83,306,343)
83,312,594
Total Investments in Securities
(Cost: $2,196,260,561)
2,529,678,385
Other Assets & Liabilities, Net
(67,944,896
)
Net Assets
2,461,733,489
Notes to Portfolio of Investments 
(a)
Non-income producing investment.
(b)
Under Section 2(a)(3) of the Investment Company Act of 1940, an affiliated company is one in which the Fund owns 5% or more of the company’s outstanding voting securities, or a company which is under common ownership or control with the Fund. The value of the holdings and transactions in these affiliated companies during the period ended June 30, 2025 are as follows:
 
Affiliated issuers
Beginning
of period($)
Purchases($)
Sales($)
Net change in
unrealized
appreciation
(depreciation)($)
End of
period($)
Realized gain
(loss)($)
Dividends($)
End of
period shares
Columbia Short-Term Cash Fund, 4.473%
 
28,748,849
319,720,157
(327,020,514
)
1,025
21,449,517
1,877
643,074
21,453,808
GCM Grosvenor, Inc., Class A
 
60,670,978
1,799,376
(3,646,994
)
58,823,360
1,103,650
5,088,526
Total
89,419,827
(3,645,969
)
80,272,877
1,877
1,746,724
 
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
5

Portfolio of Investments  (continued)
Columbia Acorn® Fund, June 30, 2025 (Unaudited)
Notes to Portfolio of Investments (continued)
(c)
All or a portion of this security was on loan at June 30, 2025. The total market value of securities on loan at June 30, 2025 was $60,428,091.
(d)
Represents fair value as determined in good faith under procedures approved by the Board of Trustees. At June 30, 2025, the total value of these securities amounted to $102,062, which represents less than 0.01% of total net assets.
(e)
Denotes a restricted security, which is subject to legal or contractual restrictions on resale under federal securities laws. Disposal of a restricted investment may involve time-consuming negotiations and expenses, and prompt sale at an acceptable price may be difficult to achieve. Private placement securities are generally considered to be restricted, although certain of those securities may be traded between qualified institutional investors under the provisions of Section 4(a)(2) and Rule 144A. The Fund will not incur any registration costs upon such a trade. These securities are valued at fair value determined in good faith under consistently applied procedures approved by the Fund’s Board of Trustees. At June 30, 2025, the total market value of these securities amounted to $102,062, which represents less than 0.01% of total net assets. Additional information on these securities is as follows:
 
Security
Acquisition
Dates
Shares
Cost ($)
Value ($)
DNA Script
10/01/2021
1,139
993,179
102,062
 
(f)
Valuation based on significant unobservable inputs.
(g)
The rate shown is the seven-day current annualized yield at June 30, 2025.
(h)
Investment made with cash collateral received from securities lending activity.
Abbreviation Legend 
ADR
American Depositary Receipt
Fair value measurements  
The Fund categorizes its fair value measurements according to a three-level hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs by prioritizing that the most observable input be used when available. Observable inputs are those that market participants would use in pricing an investment based on market data obtained from sources independent of the reporting entity. Unobservable inputs are those that reflect the Fund’s assumptions about the information market participants would use in pricing an investment. An investment’s level within the fair value hierarchy is based on the lowest level of any input that is deemed significant to the asset’s or liability’s fair value measurement. The input levels are not necessarily an indication of the risk or liquidity associated with investments at that level. For example, certain U.S. government securities are generally high quality and liquid, however, they are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market.
Fair value inputs are summarized in the three broad levels listed below:

 Level 1 — Valuations based on quoted prices for investments in active markets that the Fund has the ability to access at the measurement date.  Valuation adjustments are not applied to Level 1 investments.

 Level 2 — Valuations based on other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).

 Level 3 — Valuations based on significant unobservable inputs (including the Fund’s own assumptions and judgment in determining the fair value of investments).
Inputs that are used in determining fair value of an investment may include price information, credit data, volatility statistics, and other factors. These inputs can be either observable or unobservable. The availability of observable inputs can vary between investments, and is affected by various factors such as the type of investment, and the volume and level of activity for that investment or similar investments in the marketplace. The inputs will be considered by the Investment Manager, along with any other relevant factors in the calculation of an investment’s fair value. The Fund uses prices and inputs that are current as of the measurement date, which may include periods of market dislocations. During these periods, the availability of prices and inputs may be reduced for many investments. This condition could cause an investment to be reclassified between the various levels within the hierarchy.
Investments falling into the Level 3 category, if any, are primarily supported by quoted prices from brokers and dealers participating in the market for those investments. However, these may be classified as Level 3 investments due to lack of market transparency and corroboration to support these quoted prices. Additionally, valuation models may be used as the pricing source for any remaining investments classified as Level 3. These models may rely on one or more significant unobservable inputs and/or significant assumptions by the Investment Manager. Inputs used in valuations may include, but are not limited to, financial statement analysis, capital account balances, discount rates and estimated cash flows, and comparable company data.
The Fund’s Board of Trustees (the Board) has designated the Investment Manager, through its Valuation Committee (the Committee), as valuation designee, responsible for determining the fair value of the assets of the Fund for which market quotations are not readily available using valuation procedures approved by the Board. The Committee consists of voting and non-voting members from various groups within the Investment Manager’s organization, including operations and accounting, trading and investments, compliance, risk management and legal.
The Committee meets at least monthly to review and approve valuation matters, which may include a description of specific valuation determinations, data regarding pricing information received from approved pricing vendors and brokers and the results of Board-approved valuation policies and procedures (the Policies). The Policies address, among other things, instances when market quotations are or are not readily available, including recommendations of third party pricing vendors and a determination of appropriate pricing methodologies; events that require specific valuation determinations and assessment of fair value techniques; securities with a potential for stale pricing, including those that are illiquid, restricted, or in default; and the effectiveness of third party pricing vendors, including periodic reviews of vendors. The Committee meets more frequently, as needed, to discuss additional valuation matters, which may include the need to review back-testing results, review time-sensitive information or approve related valuation actions. Representatives of Columbia Management Investment Advisers, LLC report to the Board at each of its regularly scheduled meetings to discuss valuation matters and actions during the period, similar to those described earlier.
The accompanying Notes to Financial Statements are an integral part of this statement.
6
Columbia Acorn Trust  | 2025

Portfolio of Investments  (continued)
Columbia Acorn® Fund, June 30, 2025 (Unaudited)
Fair value measurements   (continued)
The following table is a summary of the inputs used to value the Fund’s investments at June 30, 2025: 
 
Level 1 ($)
Level 2 ($)
Level 3 ($)
Total ($)
Investments in Securities
Common Stocks
Consumer Discretionary
413,611,157
413,611,157
Consumer Staples
119,157,528
119,157,528
Energy
51,135,167
51,135,167
Financials
236,998,424
236,998,424
Health Care
492,776,493
102,062
492,878,555
Industrials
627,088,994
627,088,994
Information Technology
427,244,264
427,244,264
Real Estate
51,346,473
51,346,473
Total Common Stocks
2,419,358,500
102,062
2,419,460,562
Exchange-Traded Equity Funds
26,905,229
26,905,229
Money Market Funds
83,312,594
83,312,594
Total Investments in Securities
2,529,576,323
102,062
2,529,678,385
See the Portfolio of Investments for all investment classifications not indicated in the table.
The Fund does not hold any significant investments (greater than one percent of net assets) categorized as Level 3.
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
7

Portfolio of Investments
Columbia Acorn International®, June 30, 2025 (Unaudited)
(Percentages represent value of investments compared to net assets)
Investments in securities
 
 
Common Stocks 99.5%
Issuer
Shares
Value ($)
Australia 3.7%
CAR Group Ltd.
845,076
20,811,924
Pro Medicus Ltd.
70,767
13,242,960
Total
34,054,884
Canada 1.5%
Altus Group Ltd.
140,417
5,433,135
CCL Industries, Inc., Class B
139,462
8,132,680
Total
13,565,815
China 1.5%
Silergy Corp.
1,138,000
13,862,245
Finland 2.7%
Konecranes OYJ
119,353
9,483,995
Valmet OYJ
504,309
15,629,543
Total
25,113,538
France 3.1%
Gaztransport Et Technigaz SA
63,347
12,531,509
Robertet SA
5,645
5,293,150
Virbac SA
28,216
10,620,929
Total
28,445,588
Germany 8.2%
Atoss Software SE
76,237
12,675,580
CTS Eventim AG & Co. KGaA
194,181
24,146,540
Hypoport SE(a)
74,680
17,789,215
Nemetschek SE
146,401
21,227,094
Total
75,838,429
India 0.8%
Max Healthcare Institute Ltd.
530,796
7,897,571
Ireland 1.9%
Bank of Ireland Group PLC
1,264,765
18,023,060
Italy 2.0%
Amplifon SpA
505,218
11,865,456
Carel Industries SpA
241,694
6,442,660
Total
18,308,116
Common Stocks (continued)
Issuer
Shares
Value ($)
Japan 34.1%
Capcom Co., Ltd.
862,500
29,455,664
Disco Corp.
57,700
17,093,246
Gunma Bank Ltd. (The)
1,030,400
8,648,946
Kakaku.com, Inc.
847,000
15,706,888
Kokusai Electric Corp.
587,400
14,055,031
Kyoritsu Maintenance Co., Ltd.
408,800
9,979,995
Kyudenko Corp.
304,200
12,585,593
Macnica Holdings, Inc.
325,400
4,365,600
MatsukiyoCocokara & Co.
397,500
8,176,784
Nippon Sanso Holdings Corp.
481,100
18,205,550
Nissin Foods Holdings Co., Ltd.
363,100
7,543,458
Niterra Co., Ltd.
654,200
21,751,057
Nomura Real Estate Holdings, Inc.
2,734,500
16,016,567
Obic Co., Ltd.
414,500
16,117,863
Omron Corp.
409,300
11,033,275
Recruit Holdings Co., Ltd.
181,400
10,667,524
Sanwa Holdings Corp.
400,700
13,289,476
Sekisui Chemical Co., Ltd.
720,000
13,039,692
Simplex Holdings, Inc.
700,300
18,947,547
Sundrug Co., Ltd.
177,000
5,539,187
Suntory Beverage & Food Ltd.
595,100
19,030,966
Taisei Corp.
276,700
16,115,160
Yaskawa Electric Corp.
354,900
8,025,427
Total
315,390,496
Mexico 1.8%
Corporación Inmobiliaria Vesta SAB de CV
5,949,523
16,369,947
Netherlands 3.6%
BE Semiconductor Industries NV
108,708
16,257,646
IMCD NV
129,332
17,394,555
Total
33,652,201
New Zealand 2.6%
Fisher & Paykel Healthcare Corp., Ltd.
1,101,702
24,198,584
Spain 1.4%
Viscofan SA
177,979
12,660,122
The accompanying Notes to Financial Statements are an integral part of this statement.
8
Columbia Acorn Trust  | 2025

Portfolio of Investments  (continued)
Columbia Acorn International®, June 30, 2025 (Unaudited)
Common Stocks (continued)
Issuer
Shares
Value ($)
Sweden 4.3%
AddTech AB, B Shares
315,479
10,755,170
Hexagon AB, Class B
1,648,513
16,616,349
Munters Group AB
478,905
7,018,500
Thule Group AB
208,458
6,004,374
Total
40,394,393
Switzerland 5.2%
Belimo Holding AG, Registered Shares
20,795
21,196,389
Inficon Holding AG, Registered Shares
82,514
11,082,203
Kardex Holding AG
22,469
7,814,918
VAT Group AG
19,160
8,118,709
Total
48,212,219
United Kingdom 17.8%
Ashtead Group PLC
196,308
12,588,460
Auto Trader Group PLC
2,046,313
23,178,170
Baltic Classifieds Group PLC
1,469,849
7,525,604
ConvaTec Group PLC
5,024,691
19,903,042
Genus PLC
218,899
6,147,209
Halma PLC
595,605
26,179,296
Howden Joinery Group PLC
1,131,973
13,311,456
Common Stocks (continued)
Issuer
Shares
Value ($)
Intermediate Capital Group PLC
784,412
20,807,234
Rightmove PLC
2,274,199
24,614,616
Safestore Holdings PLC
1,099,285
10,683,249
Total
164,938,336
United States 3.3%
CRH PLC
138,047
12,743,079
Interparfums, Inc.
134,837
17,705,447
Total
30,448,526
Total Common Stocks
(Cost $625,399,297)
921,374,070
 
Money Market Funds 0.5%
 
Shares
Value ($)
Columbia Short-Term Cash Fund, 4.473%(b),(c)
4,104,225
4,103,404
Total Money Market Funds
(Cost $4,102,999)
4,103,404
Total Investments in Securities
(Cost $629,502,296)
925,477,474
Other Assets & Liabilities, Net
202,586
Net Assets
$925,680,060
Notes to Portfolio of Investments 
(a)
Non-income producing investment.
(b)
The rate shown is the seven-day current annualized yield at June 30, 2025.
(c)
Under Section 2(a)(3) of the Investment Company Act of 1940, an affiliated company is one in which the Fund owns 5% or more of the company’s outstanding voting securities, or a company which is under common ownership or control with the Fund. The value of the holdings and transactions in these affiliated companies during the period ended June 30, 2025 are as follows:
 
Affiliated issuers
Beginning
of period($)
Purchases($)
Sales($)
Net change in
unrealized
appreciation
(depreciation)($)
End of
period($)
Realized gain
(loss)($)
Dividends($)
End of
period shares
Columbia Short-Term Cash Fund, 4.473%
 
3,715,484
92,481,960
(92,094,445
)
405
4,103,404
(2,511
)
135,239
4,104,225
Fair value measurements  
The Fund categorizes its fair value measurements according to a three-level hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs by prioritizing that the most observable input be used when available. Observable inputs are those that market participants would use in pricing an investment based on market data obtained from sources independent of the reporting entity. Unobservable inputs are those that reflect the Fund’s assumptions about the information market participants would use in pricing an investment. An investment’s level within the fair value hierarchy is based on the lowest level of any input that is deemed significant to the asset’s or liability’s fair value measurement. The input levels are not necessarily an indication of the risk or liquidity associated with investments at that level. For example, certain U.S. government securities are generally high quality and liquid, however, they are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market.
Fair value inputs are summarized in the three broad levels listed below:
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
9

Portfolio of Investments  (continued)
Columbia Acorn International®, June 30, 2025 (Unaudited)
Fair value measurements   (continued)

 Level 1 — Valuations based on quoted prices for investments in active markets that the Fund has the ability to access at the measurement date.  Valuation adjustments are not applied to Level 1 investments.

 Level 2 — Valuations based on other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).

 Level 3 — Valuations based on significant unobservable inputs (including the Fund’s own assumptions and judgment in determining the fair value of investments).
Inputs that are used in determining fair value of an investment may include price information, credit data, volatility statistics, and other factors. These inputs can be either observable or unobservable. The availability of observable inputs can vary between investments, and is affected by various factors such as the type of investment, and the volume and level of activity for that investment or similar investments in the marketplace. The inputs will be considered by the Investment Manager, along with any other relevant factors in the calculation of an investment’s fair value. The Fund uses prices and inputs that are current as of the measurement date, which may include periods of market dislocations. During these periods, the availability of prices and inputs may be reduced for many investments. This condition could cause an investment to be reclassified between the various levels within the hierarchy.
Values of foreign equity securities actively traded in markets where there is a significant delay in the local close relative to the New York Stock Exchange may include an adjustment to reflect the impact of market movements following the close of local trading, as described in Note 2 to the financial statements – Security valuation. When such adjustments have been made, the foreign equity securities are classified as Level 2.
Investments falling into the Level 3 category, if any, are primarily supported by quoted prices from brokers and dealers participating in the market for those investments. However, these may be classified as Level 3 investments due to lack of market transparency and corroboration to support these quoted prices. Additionally, valuation models may be used as the pricing source for any remaining investments classified as Level 3. These models may rely on one or more significant unobservable inputs and/or significant assumptions by the Investment Manager. Inputs used in valuations may include, but are not limited to, financial statement analysis, capital account balances, discount rates and estimated cash flows, and comparable company data.
The Fund’s Board of Trustees (the Board) has designated the Investment Manager, through its Valuation Committee (the Committee), as valuation designee, responsible for determining the fair value of the assets of the Fund for which market quotations are not readily available using valuation procedures approved by the Board. The Committee consists of voting and non-voting members from various groups within the Investment Manager’s organization, including operations and accounting, trading and investments, compliance, risk management and legal.
The Committee meets at least monthly to review and approve valuation matters, which may include a description of specific valuation determinations, data regarding pricing information received from approved pricing vendors and brokers and the results of Board-approved valuation policies and procedures (the Policies). The Policies address, among other things, instances when market quotations are or are not readily available, including recommendations of third party pricing vendors and a determination of appropriate pricing methodologies; events that require specific valuation determinations and assessment of fair value techniques; securities with a potential for stale pricing, including those that are illiquid, restricted, or in default; and the effectiveness of third party pricing vendors, including periodic reviews of vendors. The Committee meets more frequently, as needed, to discuss additional valuation matters, which may include the need to review back-testing results, review time-sensitive information or approve related valuation actions. Representatives of Columbia Management Investment Advisers, LLC report to the Board at each of its regularly scheduled meetings to discuss valuation matters and actions during the period, similar to those described earlier.
The following table is a summary of the inputs used to value the Fund’s investments at June 30, 2025: 
 
Level 1 ($)
Level 2 ($)
Level 3 ($)
Total ($)
Investments in Securities
Common Stocks
Australia
34,054,884
34,054,884
Canada
13,565,815
13,565,815
China
13,862,245
13,862,245
Finland
25,113,538
25,113,538
France
28,445,588
28,445,588
Germany
75,838,429
75,838,429
India
7,897,571
7,897,571
Ireland
18,023,060
18,023,060
Italy
18,308,116
18,308,116
Japan
315,390,496
315,390,496
Mexico
16,369,947
16,369,947
Netherlands
33,652,201
33,652,201
New Zealand
24,198,584
24,198,584
Spain
12,660,122
12,660,122
Sweden
40,394,393
40,394,393
Switzerland
48,212,219
48,212,219
United Kingdom
18,208,853
146,729,483
164,938,336
United States
17,705,447
12,743,079
30,448,526
Total Common Stocks
73,747,633
847,626,437
921,374,070
Money Market Funds
4,103,404
4,103,404
Total Investments in Securities
77,851,037
847,626,437
925,477,474
See the Portfolio of Investments for all investment classifications not indicated in the table.
The accompanying Notes to Financial Statements are an integral part of this statement.
10
Columbia Acorn Trust  | 2025

Portfolio of Investments  (continued)
Columbia Acorn International®, June 30, 2025 (Unaudited)
Fair value measurements   (continued)
The Fund’s assets assigned to the Level 2 input category are generally valued using the market approach, in which a security’s value is determined through reference to prices and information from market transactions for similar or identical assets. These assets include certain foreign securities for which a third party statistical pricing service may be employed for purposes of fair market valuation. The model utilized by such third party statistical pricing service takes into account a security’s correlation to available market data including relevant general and sector indices, currency fluctuations, depositary receipts, and futures, as applicable.
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
11

Portfolio of Investments
Columbia Acorn International SelectSM, June 30, 2025 (Unaudited)
(Percentages represent value of investments compared to net assets)
Investments in securities
 
 
Common Stocks 98.9%
Issuer
Shares
Value ($)
Australia 1.5%
CSL Ltd.
19,170
3,028,105
Canada 0.7%
Shopify, Inc., Class A(a)
11,780
1,358,669
Denmark 2.0%
Novo Nordisk A/S, Class B
59,175
4,100,475
Finland 0.5%
Konecranes OYJ
13,075
1,038,962
France 15.9%
Airbus Group SE
26,349
5,512,230
Cie de Saint-Gobain SA
22,488
2,641,783
EssilorLuxottica SA
11,484
3,153,421
L’Oreal SA
6,884
2,948,786
LVMH Moet Hennessy Louis Vuitton SE
6,971
3,648,482
Publicis Groupe SA
44,604
5,037,788
Schneider Electric SE
29,845
8,012,932
TotalEnergies SE
21,939
1,340,970
Total
32,296,392
Germany 8.5%
Adidas AG
22,562
5,266,646
Deutsche Telekom AG, Registered Shares
123,264
4,511,906
Nemetschek SE
25,067
3,634,535
SAP SE
12,455
3,808,483
Total
17,221,570
India 2.2%
Max Healthcare Institute Ltd.
119,375
1,776,149
Phoenix Mills Ltd. (The)
144,502
2,632,608
Total
4,408,757
Ireland 2.7%
Bank of Ireland Group PLC
381,479
5,436,124
Japan 27.1%
Capcom Co., Ltd.
232,600
7,943,637
Daikin Industries Ltd.
20,000
2,347,675
Disco Corp.
12,700
3,762,292
Gunma Bank Ltd. (The)
335,300
2,814,433
Kokusai Electric Corp.
100,600
2,407,109
Common Stocks (continued)
Issuer
Shares
Value ($)
MatsukiyoCocokara & Co.
117,200
2,410,866
Niterra Co., Ltd.
98,300
3,268,311
Nomura Real Estate Holdings, Inc.
322,000
1,886,025
Omron Corp.
98,800
2,663,297
ORIX Corp.
136,100
3,071,325
Recruit Holdings Co., Ltd.
59,500
3,498,995
Shimadzu Corp.
54,900
1,357,293
Sony Group Corp.
166,500
4,329,054
Suntory Beverage & Food Ltd.
125,800
4,023,014
Taisei Corp.
69,400
4,041,894
Tokyo Electron Ltd.
18,400
3,523,774
Yaskawa Electric Corp.
80,700
1,824,886
Total
55,173,880
Netherlands 3.6%
ASML Holding NV
6,671
5,345,718
IMCD NV
14,131
1,900,554
Total
7,246,272
New Zealand 1.6%
Fisher & Paykel Healthcare Corp., Ltd.
148,045
3,251,768
Singapore 1.7%
DBS Group Holdings Ltd.
97,790
3,452,191
Spain 1.9%
Industria de Diseno Textil SA
75,631
3,945,424
Switzerland 7.1%
Belimo Holding AG, Registered Shares
3,475
3,542,075
Lonza Group AG, Registered Shares
5,084
3,635,891
Nestlé SA, Registered Shares
46,461
4,619,449
VAT Group AG
6,447
2,731,801
Total
14,529,216
United Kingdom 20.3%
3i Group PLC
115,540
6,538,664
Ashtead Group PLC
38,222
2,451,027
Auto Trader Group PLC
177,233
2,007,482
BT Group PLC
1,857,140
4,945,049
ConvaTec Group PLC
882,123
3,494,131
Halma PLC
76,902
3,380,160
The accompanying Notes to Financial Statements are an integral part of this statement.
12
Columbia Acorn Trust  | 2025

Portfolio of Investments  (continued)
Columbia Acorn International SelectSM, June 30, 2025 (Unaudited)
Common Stocks (continued)
Issuer
Shares
Value ($)
Howden Joinery Group PLC
285,015
3,351,639
Intermediate Capital Group PLC
150,106
3,981,697
London Stock Exchange Group PLC
29,163
4,265,008
Reckitt Benckiser Group PLC
44,362
3,022,250
Rightmove PLC
235,662
2,550,669
Rio Tinto PLC
23,486
1,366,982
Total
41,354,758
United States 1.6%
CRH PLC
36,450
3,364,689
Total Common Stocks
(Cost $160,468,969)
201,207,252
 
Money Market Funds 0.8%
 
Shares
Value ($)
Columbia Short-Term Cash Fund, 4.473%(b),(c)
1,674,643
1,674,308
Total Money Market Funds
(Cost $1,674,211)
1,674,308
Total Investments in Securities
(Cost $162,143,180)
202,881,560
Other Assets & Liabilities, Net
639,455
Net Assets
$203,521,015
Notes to Portfolio of Investments 
(a)
Non-income producing investment.
(b)
The rate shown is the seven-day current annualized yield at June 30, 2025.
(c)
Under Section 2(a)(3) of the Investment Company Act of 1940, an affiliated company is one in which the Fund owns 5% or more of the company’s outstanding voting securities, or a company which is under common ownership or control with the Fund. The value of the holdings and transactions in these affiliated companies during the period ended June 30, 2025 are as follows:
 
Affiliated issuers
Beginning
of period($)
Purchases($)
Sales($)
Net change in
unrealized
appreciation
(depreciation)($)
End of
period($)
Realized gain
(loss)($)
Dividends($)
End of
period shares
Columbia Short-Term Cash Fund, 4.473%
 
2,828,723
15,626,953
(16,781,266
)
(102
)
1,674,308
685
50,294
1,674,643
Fair value measurements  
The Fund categorizes its fair value measurements according to a three-level hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs by prioritizing that the most observable input be used when available. Observable inputs are those that market participants would use in pricing an investment based on market data obtained from sources independent of the reporting entity. Unobservable inputs are those that reflect the Fund’s assumptions about the information market participants would use in pricing an investment. An investment’s level within the fair value hierarchy is based on the lowest level of any input that is deemed significant to the asset’s or liability’s fair value measurement. The input levels are not necessarily an indication of the risk or liquidity associated with investments at that level. For example, certain U.S. government securities are generally high quality and liquid, however, they are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market.
Fair value inputs are summarized in the three broad levels listed below:

 Level 1 — Valuations based on quoted prices for investments in active markets that the Fund has the ability to access at the measurement date.  Valuation adjustments are not applied to Level 1 investments.

 Level 2 — Valuations based on other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).

 Level 3 — Valuations based on significant unobservable inputs (including the Fund’s own assumptions and judgment in determining the fair value of investments).
Inputs that are used in determining fair value of an investment may include price information, credit data, volatility statistics, and other factors. These inputs can be either observable or unobservable. The availability of observable inputs can vary between investments, and is affected by various factors such as the type of investment, and the volume and level of activity for that investment or similar investments in the marketplace. The inputs will be considered by the Investment Manager, along with any other relevant factors in the calculation of an investment’s fair value. The Fund uses prices and inputs that are current as of the measurement date, which may include periods of market dislocations. During these periods, the availability of prices and inputs may be reduced for many investments. This condition could cause an investment to be reclassified between the various levels within the hierarchy.
Values of foreign equity securities actively traded in markets where there is a significant delay in the local close relative to the New York Stock Exchange may include an adjustment to reflect the impact of market movements following the close of local trading, as described in Note 2 to the financial statements – Security valuation. When such adjustments have been made, the foreign equity securities are classified as Level 2.
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
13

Portfolio of Investments  (continued)
Columbia Acorn International SelectSM, June 30, 2025 (Unaudited)
Fair value measurements   (continued)
Investments falling into the Level 3 category, if any, are primarily supported by quoted prices from brokers and dealers participating in the market for those investments. However, these may be classified as Level 3 investments due to lack of market transparency and corroboration to support these quoted prices. Additionally, valuation models may be used as the pricing source for any remaining investments classified as Level 3. These models may rely on one or more significant unobservable inputs and/or significant assumptions by the Investment Manager. Inputs used in valuations may include, but are not limited to, financial statement analysis, capital account balances, discount rates and estimated cash flows, and comparable company data.
The Fund’s Board of Trustees (the Board) has designated the Investment Manager, through its Valuation Committee (the Committee), as valuation designee, responsible for determining the fair value of the assets of the Fund for which market quotations are not readily available using valuation procedures approved by the Board. The Committee consists of voting and non-voting members from various groups within the Investment Manager’s organization, including operations and accounting, trading and investments, compliance, risk management and legal.
The Committee meets at least monthly to review and approve valuation matters, which may include a description of specific valuation determinations, data regarding pricing information received from approved pricing vendors and brokers and the results of Board-approved valuation policies and procedures (the Policies). The Policies address, among other things, instances when market quotations are or are not readily available, including recommendations of third party pricing vendors and a determination of appropriate pricing methodologies; events that require specific valuation determinations and assessment of fair value techniques; securities with a potential for stale pricing, including those that are illiquid, restricted, or in default; and the effectiveness of third party pricing vendors, including periodic reviews of vendors. The Committee meets more frequently, as needed, to discuss additional valuation matters, which may include the need to review back-testing results, review time-sensitive information or approve related valuation actions. Representatives of Columbia Management Investment Advisers, LLC report to the Board at each of its regularly scheduled meetings to discuss valuation matters and actions during the period, similar to those described earlier.
The following table is a summary of the inputs used to value the Fund’s investments at June 30, 2025: 
 
Level 1 ($)
Level 2 ($)
Level 3 ($)
Total ($)
Investments in Securities
Common Stocks
Australia
3,028,105
3,028,105
Canada
1,358,669
1,358,669
Denmark
4,100,475
4,100,475
Finland
1,038,962
1,038,962
France
32,296,392
32,296,392
Germany
17,221,570
17,221,570
India
1,776,149
2,632,608
4,408,757
Ireland
5,436,124
5,436,124
Japan
55,173,880
55,173,880
Netherlands
7,246,272
7,246,272
New Zealand
3,251,768
3,251,768
Singapore
3,452,191
3,452,191
Spain
3,945,424
3,945,424
Switzerland
14,529,216
14,529,216
United Kingdom
41,354,758
41,354,758
United States
3,364,689
3,364,689
Total Common Stocks
3,134,818
198,072,434
201,207,252
Money Market Funds
1,674,308
1,674,308
Total Investments in Securities
4,809,126
198,072,434
202,881,560
See the Portfolio of Investments for all investment classifications not indicated in the table.
The Fund’s assets assigned to the Level 2 input category are generally valued using the market approach, in which a security’s value is determined through reference to prices and information from market transactions for similar or identical assets. These assets include certain foreign securities for which a third party statistical pricing service may be employed for purposes of fair market valuation. The model utilized by such third party statistical pricing service takes into account a security’s correlation to available market data including relevant general and sector indices, currency fluctuations, depositary receipts, and futures, as applicable.
The accompanying Notes to Financial Statements are an integral part of this statement.
14
Columbia Acorn Trust  | 2025

Portfolio of Investments
Columbia Thermostat FundSM, June 30, 2025 (Unaudited)
(Percentages represent value of investments compared to net assets)
Investments in securities
 
 
Equity Funds 32.1%
 
Shares
Value ($)
U.S. Large Cap 32.1%
Columbia Contrarian Core Fund, Institutional 3
Class(a)
3,234,272
125,489,769
Columbia Large Cap Enhanced Core Fund,
Institutional 3 Class(a)
4,496,052
124,810,396
Columbia Large Cap Growth Fund, Institutional 3
Class(a),(b)
622,897
50,448,411
Columbia Large Cap Index Fund, Institutional 3
Class(a)
1,853,125
100,439,401
Total
401,187,977
Total Equity Funds
(Cost $331,878,548)
401,187,977
 
Exchange-Traded Equity Funds 8.1%
 
 
 
U.S. Large Cap 8.1%
Columbia Research Enhanced Core ETF(a)
2,732,920
100,544,127
Total Exchange-Traded Equity Funds
(Cost $83,660,551)
100,544,127
 
Exchange-Traded Fixed Income Funds 6.0%
 
 
 
Multisector 6.0%
Columbia Diversified Fixed Income Allocation
ETF(a)
4,078,290
74,265,661
Total Exchange-Traded Fixed Income Funds
(Cost $74,086,203)
74,265,661
 
Fixed Income Funds 53.6%
 
Shares
Value ($)
High Yield 5.9%
Columbia High Yield Bond Fund, Institutional 3
Class(a)
6,668,761
74,289,996
Investment Grade 47.7%
Columbia Corporate Income Fund, Institutional 3
Class(a)
16,163,407
148,541,708
Columbia Quality Income Fund, Institutional 3
Class(a)
6,175,344
112,082,494
Columbia Total Return Bond Fund, Institutional 3
Class(a)
6,059,729
186,336,656
Columbia U.S. Treasury Index Fund, Institutional
3 Class(a)
14,828,923
148,289,234
Total
595,250,092
Total Fixed Income Funds
(Cost $650,456,095)
669,540,088
 
Money Market Funds 0.3%
 
 
 
Columbia Short-Term Cash Fund, 4.473%(a),(c)
3,950,796
3,950,006
Total Money Market Funds
(Cost $3,949,445)
3,950,006
Total Investments in Securities
(Cost: $1,144,030,842)
1,249,487,859
Other Assets & Liabilities, Net
(882,846
)
Net Assets
1,248,605,013
Notes to Portfolio of Investments 
(a)
Under Section 2(a)(3) of the Investment Company Act of 1940, an affiliated company is one in which the Fund owns 5% or more of the company’s outstanding voting securities, or a company which is under common ownership or control with the Fund. The value of the holdings and transactions in these affiliated companies during the period ended June 30, 2025 are as follows:
 
Affiliated issuers
Beginning
of period($)
Purchases($)
Sales($)
Net change in
unrealized
appreciation
(depreciation)($)
End of
period($)
Capital gain
distributions($)
Realized gain
(loss)($)
Dividends —
affiliated
issuers ($)
End of
period shares
Columbia Contrarian Core Fund, Institutional 3 Class
 
74,265,906
99,398,700
(63,544,868
)
15,370,031
125,489,769
2,321,353
3,234,272
Columbia Corporate Income Fund, Institutional 3 Class
 
180,071,090
49,518,344
(87,131,381
)
6,083,655
148,541,708
(3,311,180
)
3,469,869
16,163,407
Columbia Diversified Fixed Income Allocation ETF
 
89,144,643
22,672,248
(41,659,823
)
4,108,593
74,265,661
(1,358,716
)
1,505,773
4,078,290
Columbia High Yield Bond Fund, Institutional 3 Class
 
90,169,866
23,041,807
(40,228,944
)
1,307,267
74,289,996
(469,286
)
2,191,898
6,668,761
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
15

Portfolio of Investments  (continued)
Columbia Thermostat FundSM, June 30, 2025 (Unaudited)
Notes to Portfolio of Investments (continued)
Affiliated issuers
Beginning
of period($)
Purchases($)
Sales($)
Net change in
unrealized
appreciation
(depreciation)($)
End of
period($)
Capital gain
distributions($)
Realized gain
(loss)($)
Dividends —
affiliated
issuers ($)
End of
period shares
Columbia Large Cap Enhanced Core Fund, Institutional 3 Class
 
74,525,468
101,172,397
(60,302,242
)
9,414,773
124,810,396
3,335,563
1,299,487
215,721
4,496,052
Columbia Large Cap Growth Fund, Institutional 3 Class
 
29,688,679
41,570,614
(26,443,928
)
5,633,046
50,448,411
2,189,223
622,897
Columbia Large Cap Index Fund, Institutional 3 Class
 
59,756,842
88,638,813
(48,331,019
)
374,765
100,439,401
10,553,819
2,335,565
186,589
1,853,125
Columbia Quality Income Fund, Institutional 3 Class
 
134,970,124
38,692,502
(74,598,083
)
13,017,951
112,082,494
(7,458,298
)
2,271,243
6,175,344
Columbia Research Enhanced Core ETF
 
29,495,409
98,503,963
(37,941,140
)
10,485,895
100,544,127
1,748,867
2,732,920
Columbia Short-Term Cash Fund, 4.473%
 
3,388,538
83,755,331
(83,194,423
)
560
3,950,006
(184
)
103,193
3,950,796
Columbia Small Cap Index Fund, Institutional 3 Class
 
28,668,806
41,403,621
(70,048,921
)
(23,506
)
(2,602,376
)
Columbia Total Return Bond Fund, Institutional 3 Class
 
225,118,342
64,298,438
(110,493,650
)
7,413,526
186,336,656
(649,921
)
4,672,180
6,059,729
Columbia U.S. Treasury Index Fund, Institutional 3 Class
 
179,923,815
51,440,034
(88,846,216
)
5,771,601
148,289,234
(1,911,855
)
2,648,220
14,828,923
Total
1,199,187,528
78,958,157
1,249,487,859
13,889,382
(7,867,321
)
17,264,686
 
(b)
Non-income producing investment.
(c)
The rate shown is the seven-day current annualized yield at June 30, 2025.
Fair value measurements  
The Fund categorizes its fair value measurements according to a three-level hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs by prioritizing that the most observable input be used when available. Observable inputs are those that market participants would use in pricing an investment based on market data obtained from sources independent of the reporting entity. Unobservable inputs are those that reflect the Fund’s assumptions about the information market participants would use in pricing an investment. An investment’s level within the fair value hierarchy is based on the lowest level of any input that is deemed significant to the asset’s or liability’s fair value measurement. The input levels are not necessarily an indication of the risk or liquidity associated with investments at that level. For example, certain U.S. government securities are generally high quality and liquid, however, they are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market.
Fair value inputs are summarized in the three broad levels listed below:

 Level 1 — Valuations based on quoted prices for investments in active markets that the Fund has the ability to access at the measurement date.  Valuation adjustments are not applied to Level 1 investments.

 Level 2 — Valuations based on other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).

 Level 3 — Valuations based on significant unobservable inputs (including the Fund’s own assumptions and judgment in determining the fair value of investments).
Inputs that are used in determining fair value of an investment may include price information, credit data, volatility statistics, and other factors. These inputs can be either observable or unobservable. The availability of observable inputs can vary between investments, and is affected by various factors such as the type of investment, and the volume and level of activity for that investment or similar investments in the marketplace. The inputs will be considered by the Investment Manager, along with any other relevant factors in the calculation of an investment’s fair value. The Fund uses prices and inputs that are current as of the measurement date, which may include periods of market dislocations. During these periods, the availability of prices and inputs may be reduced for many investments. This condition could cause an investment to be reclassified between the various levels within the hierarchy.
Investments falling into the Level 3 category, if any, are primarily supported by quoted prices from brokers and dealers participating in the market for those investments. However, these may be classified as Level 3 investments due to lack of market transparency and corroboration to support these quoted prices. Additionally, valuation models may be used as the pricing source for any remaining investments classified as Level 3. These models may rely on one or more significant unobservable inputs and/or significant assumptions by the Investment Manager. Inputs used in valuations may include, but are not limited to, financial statement analysis, capital account balances, discount rates and estimated cash flows, and comparable company data.
The accompanying Notes to Financial Statements are an integral part of this statement.
16
Columbia Acorn Trust  | 2025

Portfolio of Investments  (continued)
Columbia Thermostat FundSM, June 30, 2025 (Unaudited)
Fair value measurements   (continued)
The Fund’s Board of Trustees (the Board) has designated the Investment Manager, through its Valuation Committee (the Committee), as valuation designee, responsible for determining the fair value of the assets of the Fund for which market quotations are not readily available using valuation procedures approved by the Board. The Committee consists of voting and non-voting members from various groups within the Investment Manager’s organization, including operations and accounting, trading and investments, compliance, risk management and legal.
The Committee meets at least monthly to review and approve valuation matters, which may include a description of specific valuation determinations, data regarding pricing information received from approved pricing vendors and brokers and the results of Board-approved valuation policies and procedures (the Policies). The Policies address, among other things, instances when market quotations are or are not readily available, including recommendations of third party pricing vendors and a determination of appropriate pricing methodologies; events that require specific valuation determinations and assessment of fair value techniques; securities with a potential for stale pricing, including those that are illiquid, restricted, or in default; and the effectiveness of third party pricing vendors, including periodic reviews of vendors. The Committee meets more frequently, as needed, to discuss additional valuation matters, which may include the need to review back-testing results, review time-sensitive information or approve related valuation actions. Representatives of Columbia Management Investment Advisers, LLC report to the Board at each of its regularly scheduled meetings to discuss valuation matters and actions during the period, similar to those described earlier.
The following table is a summary of the inputs used to value the Fund’s investments at June 30, 2025: 
 
Level 1 ($)
Level 2 ($)
Level 3 ($)
Total ($)
Investments in Securities
Equity Funds
401,187,977
401,187,977
Exchange-Traded Equity Funds
100,544,127
100,544,127
Exchange-Traded Fixed Income Funds
74,265,661
74,265,661
Fixed Income Funds
669,540,088
669,540,088
Money Market Funds
3,950,006
3,950,006
Total Investments in Securities
1,249,487,859
1,249,487,859
See the Portfolio of Investments for all investment classifications not indicated in the table.
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
17

Portfolio of Investments
Columbia Acorn European FundSM, June 30, 2025 (Unaudited)
(Percentages represent value of investments compared to net assets)
Investments in securities
 
 
Common Stocks 95.9%
Issuer
Shares
Value ($)
Austria 4.7%
BAWAG Group AG(a)
5,440
695,675
DO & CO AG(a)
2,983
637,258
Wienerberger AG
16,481
615,928
Total
1,948,861
Belgium 3.4%
Azelis Group NV
34,765
555,761
Elia Group SA/NV
5,292
611,196
Melexis NV
2,694
229,636
Total
1,396,593
Denmark 0.5%
NKT A/S(a)
2,442
198,129
Finland 2.2%
Konecranes OYJ
8,822
701,011
Valmet OYJ
5,918
183,411
Total
884,422
France 11.5%
Elis SA
42,177
1,210,121
Exosens SAS
5,164
245,408
Gaztransport Et Technigaz SA
3,303
653,410
Nexans SA
6,876
899,787
SCOR SE
6,367
211,461
SPIE SA
11,576
650,925
Technip Energies NV
10,188
428,635
Virbac SA
1,115
419,703
Total
4,719,450
Germany 7.5%
AlzChem Group AG
1,379
225,775
Bilfinger SE
4,420
425,458
CTS Eventim AG & Co. KGaA
7,661
952,651
flatexDEGIRO AG
22,496
637,021
IONOS Group SE(a)
4,160
195,710
Renk Group AG
8,141
651,204
Total
3,087,819
Common Stocks (continued)
Issuer
Shares
Value ($)
Greece 2.9%
Alpha Bank SA
6,490
22,858
JUMBO SA
2,867
98,951
National Bank of Greece SA
37,493
478,064
Piraeus Financial Holdings SA
88,179
610,885
Total
1,210,758
Ireland 4.3%
Cairn Homes PLC
267,635
676,234
Glanbia PLC
28,353
418,041
Irish Continental Group PLC
72,636
470,589
Uniphar PLC
47,852
212,073
Total
1,776,937
Italy 4.6%
Buzzi SpA
13,582
753,259
Carel Industries SpA
9,869
263,071
De’ Longhi SpA
12,390
415,956
Intercos SpA
13,712
208,684
Reply SpA
1,490
257,502
Total
1,898,472
Jersey 1.2%
JTC PLC
40,175
470,617
Netherlands 2.2%
BE Semiconductor Industries NV
1,720
257,232
CTP NV(b)
31,041
653,961
Total
911,193
Norway 3.0%
Storebrand ASA
65,717
930,742
TOMRA Systems ASA
19,640
306,552
Total
1,237,294
Portugal 1.8%
Banco Comercial Portugues SA
953,478
742,794
Spain 3.3%
Fluidra SA
16,909
423,920
Indra Sistemas SA
6,960
301,969
Vidrala SA
1,847
214,623
The accompanying Notes to Financial Statements are an integral part of this statement.
18
Columbia Acorn Trust  | 2025

Portfolio of Investments  (continued)
Columbia Acorn European FundSM, June 30, 2025 (Unaudited)
Common Stocks (continued)
Issuer
Shares
Value ($)
Viscofan SA
5,794
412,143
Total
1,352,655
Sweden 4.7%
Avanza Bank Holding AB
17,991
610,464
Hexpol AB
39,473
381,840
Nordnet AB
23,293
633,147
Thule Group AB
11,354
327,038
Total
1,952,489
Switzerland 5.3%
Accelleron Industries AG
3,204
225,782
Belimo Holding AG, Registered Shares
269
274,192
Burckhardt Compression Holding AG
397
330,072
Galenica AG
1,850
202,452
Inficon Holding AG, Registered Shares
1,741
233,828
Kardex Holding AG
1,296
450,760
R&S Group Holding AG(a)
7,089
258,739
Tecan Group AG, Registered Shares
954
195,233
Total
2,171,058
United Kingdom 32.8%
4imprint Group PLC
4,705
236,183
Allfunds Group PLC
72,532
557,362
Auction Technology Group PLC(a)
56,097
350,742
Avon Technologies PLC
3,369
89,252
Beazley PLC
47,260
606,819
Bodycote PLC
50,280
403,403
Breedon Group PLC
118,231
626,439
Bridgepoint Group Ltd., Registered Shares(b)
49,885
212,819
Capital & Counties Properties PLC
302,029
646,716
Chemring Group PLC
91,207
707,762
Clarkson PLC
4,602
206,268
ConvaTec Group PLC
158,738
628,769
CVS Group PLC
34,607
594,118
Diploma PLC
7,098
476,488
discoverIE Group plc
27,238
243,771
Common Stocks (continued)
Issuer
Shares
Value ($)
Electrocomponents PLC
22,479
177,449
Genus PLC
16,605
466,308
GlobalData PLC
194,410
393,614
Greggs PLC
15,009
395,773
Howden Joinery Group PLC
33,632
395,496
IG Group Holdings PLC
27,640
404,187
IMI PLC
7,611
219,008
Intermediate Capital Group PLC
14,855
394,042
LondonMetric Property PLC
291,823
814,886
Moonpig Group PLC
146,717
451,688
Quilter PLC(b)
401,276
864,223
Rightmove PLC
22,588
244,480
Rotork PLC
44,503
196,340
Safestore Holdings PLC
91,339
887,666
SigmaRoc PLC(a)
275,518
407,158
YouGov PLC
39,818
205,270
Total
13,504,499
Total Common Stocks
(Cost $33,280,554)
39,464,040
 
Preferred Stocks 0.6%
Issuer
 
Shares
Value ($)
Germany 0.6%
FUCHS SE
4,686
258,984
Total Preferred Stocks
(Cost $217,687)
258,984
 
Money Market Funds 2.1%
 
Shares
Value ($)
Columbia Short-Term Cash Fund, 4.473%(c),(d)
878,881
878,705
Total Money Market Funds
(Cost $878,632)
878,705
Total Investments in Securities
(Cost $34,376,873)
40,601,729
Other Assets & Liabilities, Net
565,521
Net Assets
$41,167,250
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
19

Portfolio of Investments  (continued)
Columbia Acorn European FundSM, June 30, 2025 (Unaudited)
Notes to Portfolio of Investments 
(a)
Non-income producing investment.
(b)
Represents privately placed and other securities and instruments exempt from Securities and Exchange Commission registration (collectively, private placements), such as Section 4(a)(2) and Rule 144A eligible securities, which are often sold only to qualified institutional buyers. At June 30, 2025, the total value of these securities amounted to $1,731,003, which represents 4.20% of total net assets.
(c)
The rate shown is the seven-day current annualized yield at June 30, 2025.
(d)
Under Section 2(a)(3) of the Investment Company Act of 1940, an affiliated company is one in which the Fund owns 5% or more of the company’s outstanding voting securities, or a company which is under common ownership or control with the Fund. The value of the holdings and transactions in these affiliated companies during the period ended June 30, 2025 are as follows:
 
Affiliated issuers
Beginning
of period($)
Purchases($)
Sales($)
Net change in
unrealized
appreciation
(depreciation)($)
End of
period($)
Realized gain
(loss)($)
Dividends($)
End of
period shares
Columbia Short-Term Cash Fund, 4.473%
 
361,715
10,788,034
(10,271,117
)
73
878,705
(27
)
10,229
878,881
Fair value measurements  
The Fund categorizes its fair value measurements according to a three-level hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs by prioritizing that the most observable input be used when available. Observable inputs are those that market participants would use in pricing an investment based on market data obtained from sources independent of the reporting entity. Unobservable inputs are those that reflect the Fund’s assumptions about the information market participants would use in pricing an investment. An investment’s level within the fair value hierarchy is based on the lowest level of any input that is deemed significant to the asset’s or liability’s fair value measurement. The input levels are not necessarily an indication of the risk or liquidity associated with investments at that level. For example, certain U.S. government securities are generally high quality and liquid, however, they are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market.
Fair value inputs are summarized in the three broad levels listed below:

 Level 1 — Valuations based on quoted prices for investments in active markets that the Fund has the ability to access at the measurement date.  Valuation adjustments are not applied to Level 1 investments.

 Level 2 — Valuations based on other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).

 Level 3 — Valuations based on significant unobservable inputs (including the Fund’s own assumptions and judgment in determining the fair value of investments).
Inputs that are used in determining fair value of an investment may include price information, credit data, volatility statistics, and other factors. These inputs can be either observable or unobservable. The availability of observable inputs can vary between investments, and is affected by various factors such as the type of investment, and the volume and level of activity for that investment or similar investments in the marketplace. The inputs will be considered by the Investment Manager, along with any other relevant factors in the calculation of an investment’s fair value. The Fund uses prices and inputs that are current as of the measurement date, which may include periods of market dislocations. During these periods, the availability of prices and inputs may be reduced for many investments. This condition could cause an investment to be reclassified between the various levels within the hierarchy.
Values of foreign equity securities actively traded in markets where there is a significant delay in the local close relative to the New York Stock Exchange may include an adjustment to reflect the impact of market movements following the close of local trading, as described in Note 2 to the financial statements – Security valuation. When such adjustments have been made, the foreign equity securities are classified as Level 2.
Investments falling into the Level 3 category, if any, are primarily supported by quoted prices from brokers and dealers participating in the market for those investments. However, these may be classified as Level 3 investments due to lack of market transparency and corroboration to support these quoted prices. Additionally, valuation models may be used as the pricing source for any remaining investments classified as Level 3. These models may rely on one or more significant unobservable inputs and/or significant assumptions by the Investment Manager. Inputs used in valuations may include, but are not limited to, financial statement analysis, capital account balances, discount rates and estimated cash flows, and comparable company data.
The Fund’s Board of Trustees (the Board) has designated the Investment Manager, through its Valuation Committee (the Committee), as valuation designee, responsible for determining the fair value of the assets of the Fund for which market quotations are not readily available using valuation procedures approved by the Board. The Committee consists of voting and non-voting members from various groups within the Investment Manager’s organization, including operations and accounting, trading and investments, compliance, risk management and legal.
The Committee meets at least monthly to review and approve valuation matters, which may include a description of specific valuation determinations, data regarding pricing information received from approved pricing vendors and brokers and the results of Board-approved valuation policies and procedures (the Policies). The Policies address, among other things, instances when market quotations are or are not readily available, including recommendations of third party pricing vendors and a determination of appropriate pricing methodologies; events that require specific valuation determinations and assessment of fair value techniques; securities with a potential for stale pricing, including those that are illiquid, restricted, or in default; and the effectiveness of third party pricing vendors, including periodic reviews of vendors. The Committee meets more frequently, as needed, to discuss additional valuation matters, which may include the need to review back-testing results, review time-sensitive information or approve related valuation actions. Representatives of Columbia Management Investment Advisers, LLC report to the Board at each of its regularly scheduled meetings to discuss valuation matters and actions during the period, similar to those described earlier.
The accompanying Notes to Financial Statements are an integral part of this statement.
20
Columbia Acorn Trust  | 2025

Portfolio of Investments  (continued)
Columbia Acorn European FundSM, June 30, 2025 (Unaudited)
Fair value measurements   (continued)
The following table is a summary of the inputs used to value the Fund’s investments at June 30, 2025: 
 
Level 1 ($)
Level 2 ($)
Level 3 ($)
Total ($)
Investments in Securities
Common Stocks
Austria
1,948,861
1,948,861
Belgium
1,396,593
1,396,593
Denmark
198,129
198,129
Finland
884,422
884,422
France
4,719,450
4,719,450
Germany
3,087,819
3,087,819
Greece
121,809
1,088,949
1,210,758
Ireland
1,146,823
630,114
1,776,937
Italy
208,684
1,689,788
1,898,472
Jersey
470,617
470,617
Netherlands
911,193
911,193
Norway
1,237,294
1,237,294
Portugal
742,794
742,794
Spain
1,352,655
1,352,655
Sweden
1,952,489
1,952,489
Switzerland
2,171,058
2,171,058
United Kingdom
4,071,929
9,432,570
13,504,499
Total Common Stocks
5,549,245
33,914,795
39,464,040
Preferred Stocks
Germany
258,984
258,984
Total Preferred Stocks
258,984
258,984
Money Market Funds
878,705
878,705
Total Investments in Securities
6,427,950
34,173,779
40,601,729
See the Portfolio of Investments for all investment classifications not indicated in the table.
The Fund’s assets assigned to the Level 2 input category are generally valued using the market approach, in which a security’s value is determined through reference to prices and information from market transactions for similar or identical assets. These assets include certain foreign securities for which a third party statistical pricing service may be employed for purposes of fair market valuation. The model utilized by such third party statistical pricing service takes into account a security’s correlation to available market data including relevant general and sector indices, currency fluctuations, depositary receipts, and futures, as applicable.
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
21

Statement of Assets and Liabilities
June 30, 2025 (Unaudited)
 
 
Columbia
Acorn®
Fund
Columbia
Acorn
International®
Columbia
Acorn
International
SelectSM
Assets
Investments in securities, at value*
Unaffiliated issuers (cost $2,127,258,296, $625,399,297, $160,468,969, respectively)
$2,449,405,508
$921,374,070
$201,207,252
Affiliated issuers (cost $69,002,265, $4,102,999, $1,674,211, respectively)
80,272,877
4,103,404
1,674,308
Foreign currency (cost $20, $890, $101, respectively)
21
925
102
Receivable for:
Capital shares sold
154,765
46,217
1,901
Dividends
194,157
1,025,882
290,093
Securities lending income
18,676
Foreign tax reclaims
10,222
1,838,129
896,861
Expense reimbursement due from Investment Manager
5,098
5,792
Prepaid expenses
1
Deferred compensation of board members
182
Other assets
4,163
9,202
4,163
Total assets
2,530,060,571
928,402,928
204,080,472
Liabilities
Due upon return of securities on loan
61,863,077
Payable for:
Capital shares redeemed
2,008,896
716,096
77,829
Foreign capital gains taxes deferred
280,718
Management services fees
145,966
65,458
14,535
Distribution and/or service fees
10,401
2,726
2,441
Transfer agent fees
203,453
74,461
23,590
Compensation of chief compliance officer
248
91
19
Compensation of board members
794
Other expenses
17,486
36,037
19,049
Deferred compensation of board members
4,077,555
1,827,999
140,482
Total liabilities
68,327,082
2,722,868
559,457
Net assets applicable to outstanding capital stock
$2,461,733,489
$925,680,060
$203,521,015
Represented by
Paid in capital
2,256,986,464
715,904,622
171,450,496
Total distributable earnings (loss)
204,747,025
209,775,438
32,070,519
Total - representing net assets applicable to outstanding capital stock
$2,461,733,489
$925,680,060
$203,521,015
* Includes the value of securities on loan
60,428,091
The accompanying Notes to Financial Statements are an integral part of this statement.
22
Columbia Acorn Trust  | 2025

Statement of Assets and Liabilities (continued)
June 30, 2025 (Unaudited)
 
Columbia
Acorn®
Fund
Columbia
Acorn
International®
Columbia
Acorn
International
SelectSM
Class A
Net assets
$483,456,776
$132,673,452
$118,891,294
Shares outstanding
58,743,207
5,396,507
4,234,230
Net asset value per share
$8.23
$24.59
$28.08
Maximum sales charge
5.75%
5.75%
5.75%
Maximum offering price per share (calculated by dividing the net asset value per share by 1.0 minus the
maximum sales charge for Class A shares)
$8.73
$26.09
$29.79
Class C
Net assets
$5,545,905
$—
$—
Shares outstanding
491,213
Net asset value per share
$11.29
$—
$—
Institutional Class
Net assets
$1,614,973,921
$579,520,326
$59,098,752
Shares outstanding
133,979,643
23,393,897
2,059,162
Net asset value per share
$12.05
$24.77
$28.70
Institutional 2 Class
Net assets
$26,190,839
$19,398,435
$3,414,804
Shares outstanding
1,967,967
783,302
117,581
Net asset value per share
$13.31
$24.76
$29.04
Institutional 3 Class
Net assets
$24,667,743
$79,108,065
$9,151,797
Shares outstanding
1,819,973
3,126,402
315,107
Net asset value per share
$13.55
$25.30
$29.04
Class S
Net assets
$306,898,305
$114,979,782
$12,964,368
Shares outstanding
25,458,140
4,641,084
451,697
Net asset value per share
$12.06
$24.77
$28.70
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
23

Statement of Assets and Liabilities (continued)
June 30, 2025 (Unaudited)
 
 
Columbia
Thermostat
FundSM
Columbia
Acorn
European
FundSM
Assets
Investments in securities, at value
Unaffiliated issuers (cost $—, $33,498,241, respectively)
$
$39,723,024
Affiliated issuers (cost $1,144,030,842, $878,632, respectively)
1,249,487,859
878,705
Cash
3,123
Receivable for:
Investments sold
965,149
Capital shares sold
450,902
117,950
Dividends
2,521,525
43,465
Securities lending income
162
Foreign tax reclaims
224,092
Expense reimbursement due from Investment Manager
1,395
Other assets
4,162
18,753
Total assets
1,252,464,448
41,975,818
Liabilities
Foreign currency (cost $—, $2,321, respectively)
2,334
Payable for:
Investments purchased
2,502,061
614,523
Capital shares redeemed
756,503
130,509
Management services fees
10,230
3,273
Distribution and/or service fees
15,157
525
Transfer agent fees
120,757
5,240
Compensation of chief compliance officer
117
4
Compensation of board members
1,627
Other expenses
27,479
19,742
Deferred compensation of board members
427,131
30,791
Total liabilities
3,859,435
808,568
Net assets applicable to outstanding capital stock
$1,248,605,013
$41,167,250
Represented by
Paid in capital
1,254,262,030
30,785,962
Total distributable earnings (loss)
(5,657,017
)
10,381,288
Total - representing net assets applicable to outstanding capital stock
$1,248,605,013
$41,167,250
The accompanying Notes to Financial Statements are an integral part of this statement.
24
Columbia Acorn Trust  | 2025

Statement of Assets and Liabilities (continued)
June 30, 2025 (Unaudited)
 
Columbia
Thermostat
FundSM
Columbia
Acorn
European
FundSM
Class A
Net assets
$392,341,115
$25,700,770
Shares outstanding
22,295,200
886,999
Net asset value per share
$17.60
$28.97
Maximum sales charge
5.75%
5.75%
Maximum offering price per share (calculated by dividing the net asset value per share by 1.0 minus the maximum sales charge for
Class A shares)
$18.67
$30.74
Class C
Net assets
$86,891,545
$—
Shares outstanding
4,919,753
Net asset value per share
$17.66
$—
Institutional Class
Net assets
$664,365,296
$15,466,480
Shares outstanding
38,490,946
528,793
Net asset value per share
$17.26
$29.25
Institutional 2 Class
Net assets
$81,025,055
$—
Shares outstanding
4,647,961
Net asset value per share
$17.43
$—
Institutional 3 Class
Net assets
$11,169,282
$—
Shares outstanding
642,030
Net asset value per share
$17.40
$—
Class S
Net assets
$12,812,720
$—
Shares outstanding
742,311
Net asset value per share
$17.26
$—
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
25

Statement of Operations
Six Months Ended June 30, 2025 (Unaudited)
 
 
Columbia
Acorn®
Fund
Columbia
Acorn
International®
Columbia
Acorn
International
SelectSM
Net investment income
Income:
Dividends — unaffiliated issuers
$4,619,060
$10,919,218
$2,707,864
Dividends — affiliated issuers
1,746,724
135,239
50,294
Income from securities lending — net
159,475
33,739
European Union tax reclaim
1,212,619
916,899
Foreign taxes withheld
(8,850
)
(935,683
)
(220,676
)
Total income
7,729,028
10,152,513
3,454,381
Expenses:
Management services fees
8,583,098
3,761,964
833,662
Distribution and/or service fees
Class A
603,640
154,082
140,429
Class C
29,751
Transfer agent fees
Class A
205,584
70,472
110,566
Class C
2,524
Institutional Class
678,655
304,610
54,435
Institutional 2 Class
6,739
4,860
1,012
Institutional 3 Class
757
2,589
228
Class S
131,412
62,115
11,992
Administration fees
322,198
110,533
23,974
Custodian fees
9,322
49,871
10,316
Printing and postage fees
44,929
38,439
21,344
Registration fees
48,123
40,819
38,490
Accounting services fees
14,288
15,769
15,442
Legal fees
37,121
13,647
7,749
Line of credit interest
3,510
60
Compensation of chief compliance officer
209
72
16
Compensation of board members
33,805
14,482
6,748
Deferred compensation of board members
(474,532
)
(211,861
)
(9,951
)
Other
70,781
52,994
30,307
Total expenses
10,348,404
4,488,967
1,296,819
Fees waived or expenses reimbursed by Investment Manager and its affiliates
(140,677
)
(293,819
)
Fees waived by transfer agent
Institutional 2 Class
(79
)
Institutional 3 Class
(146
)
Total net expenses
10,348,404
4,348,290
1,002,775
Net investment income (loss)
(2,619,376
)
5,804,223
2,451,606
Realized and unrealized gain (loss) — net
Net realized gain (loss) on:
Investments — unaffiliated issuers
71,297,570
(3,723,570
)
2,055,953
Investments — affiliated issuers
1,877
(2,511
)
685
Foreign currency translations
109,461
55,008
Net realized gain (loss)
71,299,447
(3,616,620
)
2,111,646
Net change in unrealized appreciation (depreciation) on:
Investments — unaffiliated issuers
(169,971,524
)
139,614,833
21,853,418
Investments — affiliated issuers
(3,645,969
)
405
(102
)
Foreign currency translations
1
202,392
89,487
Foreign capital gains tax
(9,988
)
Net change in unrealized appreciation (depreciation)
(173,617,492
)
139,817,630
21,932,815
Net realized and unrealized gain (loss)
(102,318,045
)
136,201,010
24,044,461
Net increase (decrease) in net assets resulting from operations
$(104,937,421
)
$142,005,233
$26,496,067
The accompanying Notes to Financial Statements are an integral part of this statement.
26
Columbia Acorn Trust  | 2025

Statement of Operations (continued)
Six Months Ended June 30, 2025 (Unaudited)
 
 
Columbia
Thermostat
FundSM
Columbia
Acorn
European
FundSM
Net investment income
Income:
Dividends — unaffiliated issuers
$
$841,672
Dividends — affiliated issuers
17,264,686
10,229
Income from securities lending — net
1,110
Foreign taxes withheld
(83,805
)
Total income
17,264,686
769,206
Expenses:
Management services fees
588,905
205,291
Distribution and/or service fees
Class A
470,628
28,876
Class C
421,949
Transfer agent fees
Class A
178,278
14,530
Class C
39,955
Institutional Class
292,924
10,401
Institutional 2 Class
20,732
Institutional 3 Class
419
Class S
5,860
Administration fees
146,580
5,105
Custodian fees
1,153
14,781
Printing and postage fees
39,618
10,759
Registration fees
56,238
18,222
Accounting services fees
4,172
14,288
Legal fees
18,907
6,206
Line of credit interest
539
90
Compensation of chief compliance officer
99
3
Compensation of board members
17,638
5,100
Deferred compensation of board members
(23,556
)
(929
)
Other
32,413
1,865
Total expenses
2,313,451
334,588
Fees waived or expenses reimbursed by Investment Manager and its affiliates
(49,804
)
(82,389
)
Fees waived by transfer agent
Institutional 2 Class
(3,567
)
Institutional 3 Class
(257
)
Total net expenses
2,259,823
252,199
Net investment income
15,004,863
517,007
Realized and unrealized gain (loss) — net
Net realized gain (loss) on:
Investments — unaffiliated issuers
10,199,016
Investments — affiliated issuers
(7,867,321
)
(27
)
Capital gain distributions from underlying affiliated funds
13,889,382
Foreign currency translations
(4,038
)
Net realized gain
6,022,061
10,194,951
Net change in unrealized appreciation (depreciation) on:
Investments — unaffiliated issuers
(3,148,684
)
Investments — affiliated issuers
78,958,157
73
Foreign currency translations
23,621
Net change in unrealized appreciation (depreciation)
78,958,157
(3,124,990
)
Net realized and unrealized gain
84,980,218
7,069,961
Net increase in net assets resulting from operations
$99,985,081
$7,586,968
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
27

Statement of Changes in Net Assets
 
 
Columbia
Acorn® Fund
Columbia Acorn
International®
 
Six Months Ended
June 30, 2025
(Unaudited)
Year Ended
December 31, 2024
Six Months Ended
June 30, 2025
(Unaudited)
Year Ended
December 31, 2024
Operations
Net investment income (loss)
$(2,619,376
)
$(15,049,222
)
$5,804,223
$10,026,120
Net realized gain (loss)
71,299,447
354,316,937
(3,616,620
)
84,164,253
Net change in unrealized appreciation (depreciation)
(173,617,492
)
33,556,369
139,817,630
(139,384,521
)
Net increase (decrease) in net assets resulting from operations
(104,937,421
)
372,824,084
142,005,233
(45,194,148
)
Distributions to shareholders
Net investment income and net realized gains
Class A
(3,234,863
)
(14,776,573
)
Advisor Class
(187,821
)
Institutional Class
(14,046,800
)
(70,673,340
)
Institutional 2 Class
(472,416
)
(2,116,606
)
Institutional 3 Class
(1,876,200
)
(12,977,717
)
Class S
(2,802,700
)
(9,229,839
)
Total distributions to shareholders
(22,432,979
)
(109,961,896
)
Decrease in net assets from capital stock activity
(162,162,773
)
(426,753,331
)
(78,195,552
)
(118,727,568
)
Total increase (decrease) in net assets
(267,100,194
)
(53,929,247
)
41,376,702
(273,883,612
)
Net assets at beginning of period
2,728,833,683
2,782,762,930
884,303,358
1,158,186,970
Net assets at end of period
$2,461,733,489
$2,728,833,683
$925,680,060
$884,303,358
The accompanying Notes to Financial Statements are an integral part of this statement.
28
Columbia Acorn Trust  | 2025

Statement of Changes in Net Assets  (continued)
 
 
Columbia Acorn
International SelectSM
Columbia
Thermostat FundSM
 
Six Months Ended
June 30, 2025
(Unaudited)
Year Ended
December 31, 2024
Six Months Ended
June 30, 2025
(Unaudited)
Year Ended
December 31, 2024
Operations
Net investment income
$2,451,606
$2,095,239
$15,004,863
$37,470,246
Net realized gain
2,111,646
17,965,244
6,022,061
22,317,876
Net change in unrealized appreciation (depreciation)
21,932,815
(19,497,864
)
78,958,157
34,872,187
Net increase in net assets resulting from operations
26,496,067
562,619
99,985,081
94,660,309
Distributions to shareholders
Net investment income and net realized gains
Class A
(3,064,221
)
(1,124,318
)
(1,843,574
)
(12,416,154
)
Advisor Class
(10,754
)
(302,495
)
Class C
(408,755
)
(2,211,271
)
Institutional Class
(1,623,542
)
(826,746
)
(3,171,179
)
(21,710,377
)
Institutional 2 Class
(97,517
)
(56,532
)
(384,539
)
(2,679,962
)
Institutional 3 Class
(261,308
)
(114,637
)
(52,124
)
(372,731
)
Class S
(355,373
)
(61,254
)
(398,576
)
Total distributions to shareholders
(5,401,961
)
(2,132,987
)
(5,921,425
)
(40,091,566
)
Decrease in net assets from capital stock activity
(7,199,882
)
(33,869,049
)
(44,084,496
)
(198,986,914
)
Total increase (decrease) in net assets
13,894,224
(35,439,417
)
49,979,160
(144,418,171
)
Net assets at beginning of period
189,626,791
225,066,208
1,198,625,853
1,343,044,024
Net assets at end of period
$203,521,015
$189,626,791
$1,248,605,013
$1,198,625,853
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
29

Statement of Changes in Net Assets  (continued)
 
 
Columbia Acorn
European FundSM
 
Six Months Ended
June 30, 2025
(Unaudited)
Year Ended
December 31, 2024
Operations
Net investment income
$517,007
$88,737
Net realized gain
10,194,951
12,835,372
Net change in unrealized appreciation (depreciation)
(3,124,990
)
(14,829,291
)
Net increase (decrease) in net assets resulting from operations
7,586,968
(1,905,182
)
Distributions to shareholders
Net investment income and net realized gains
Class A
(598,281
)
Advisor Class
(15,596
)
Institutional Class
(488,108
)
Total distributions to shareholders
(1,101,985
)
Decrease in net assets from capital stock activity
(7,529,187
)
(16,527,056
)
Total increase (decrease) in net assets
57,781
(19,534,223
)
Net assets at beginning of period
41,109,469
60,643,692
Net assets at end of period
$41,167,250
$41,109,469
The accompanying Notes to Financial Statements are an integral part of this statement.
30
Columbia Acorn Trust  | 2025

Statement of Changes in Net Assets  (continued)
 
 
Columbia
Acorn® Fund
Columbia Acorn
International®
 
Six Months Ended
Year Ended
Six Months Ended
Year Ended
 
June 30, 2025 (Unaudited)
December 31, 2024
June 30, 2025 (Unaudited)
December 31, 2024
 
Shares
Dollars ($)
Shares
Dollars ($)
Shares
Dollars ($)
Shares
Dollars ($)
Capital stock activity
Class A
Shares sold
571,081
4,487,505
1,132,352
9,163,800
80,690
1,851,473
338,163
8,410,184
Distributions reinvested
129,517
3,098,041
623,582
14,150,032
Shares redeemed
(5,525,452
)
(43,832,453
)
(13,562,866
)
(109,021,278
)
(536,946
)
(12,124,420
)
(1,361,129
)
(33,790,944
)
Net decrease
(4,954,371
)
(39,344,948
)
(12,430,514
)
(99,857,478
)
(326,739
)
(7,174,906
)
(399,384
)
(11,230,728
)
Advisor Class
Shares sold
218,852
2,732,848
22,985
590,751
Distributions reinvested
7,258
187,630
Shares redeemed
(3,279,577
)
(46,124,474
)
(248,274
)
(6,151,410
)
Net decrease
(3,060,725
)
(43,391,626
)
(218,031
)
(5,373,029
)
Class C
Shares sold
16,580
178,163
46,214
496,832
1,368
29,826
Shares redeemed
(142,298
)
(1,544,156
)
(294,421
)
(3,234,271
)
(148,003
)
(3,228,484
)
Net decrease
(125,718
)
(1,365,993
)
(248,207
)
(2,737,439
)
(146,635
)
(3,198,658
)
Institutional Class
Shares sold
1,124,194
12,747,428
4,779,528
60,466,900
126,671
2,878,818
379,620
9,275,114
Distributions reinvested
519,977
12,531,446
2,738,250
63,070,993
Shares redeemed
(8,498,805
)
(99,006,884
)
(56,498,495
)
(679,545,275
)
(1,486,814
)
(33,631,696
)
(11,509,843
)
(296,693,997
)
Net decrease
(7,374,611
)
(86,259,456
)
(51,718,967
)
(619,078,375
)
(840,166
)
(18,221,432
)
(8,391,973
)
(224,347,890
)
Institutional 2 Class
Shares sold
267,635
3,522,824
350,551
4,595,267
72,276
1,650,916
66,030
1,649,754
Distributions reinvested
19,586
471,822
92,289
2,113,154
Shares redeemed
(283,256
)
(3,590,341
)
(751,649
)
(9,623,144
)
(70,511
)
(1,636,002
)
(290,130
)
(7,229,364
)
Net increase (decrease)
(15,621
)
(67,517
)
(401,098
)
(5,027,877
)
21,351
486,736
(131,811
)
(3,466,456
)
Institutional 3 Class
Shares sold
198,947
2,586,699
341,360
4,439,835
132,034
3,008,439
461,541
11,337,102
Distributions reinvested
75,874
1,867,250
383,395
8,931,728
Shares redeemed
(481,250
)
(6,209,694
)
(534,626
)
(7,078,513
)
(1,966,221
)
(47,374,309
)
(971,545
)
(24,990,518
)
Net decrease
(282,303
)
(3,622,995
)
(193,266
)
(2,638,678
)
(1,758,313
)
(42,498,620
)
(126,609
)
(4,721,688
)
Class R
Shares sold
1,674
40,933
Shares redeemed
(84,904
)
(2,070,566
)
Net decrease
(83,230
)
(2,029,633
)
Class S
Shares sold
93,776
1,112,335
30,814,407
380,431,067
10,350
233,751
5,384,804
142,655,849
Distributions reinvested
116,118
2,798,454
425,476
9,220,057
Shares redeemed
(2,785,907
)
(32,614,199
)
(2,664,136
)
(34,452,925
)
(611,037
)
(13,819,535
)
(684,627
)
(16,235,392
)
Net increase (decrease)
(2,692,131
)
(31,501,864
)
28,150,271
345,978,142
(484,569
)
(10,787,330
)
5,125,653
135,640,514
Total net decrease
(15,444,755
)
(162,162,773
)
(39,902,506
)
(426,753,331
)
(3,388,436
)
(78,195,552
)
(4,372,020
)
(118,727,568
)
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
31

Statement of Changes in Net Assets  (continued)
 
 
Columbia Acorn
International SelectSM
Columbia
Thermostat FundSM
 
Six Months Ended
Year Ended
Six Months Ended
Year Ended
 
June 30, 2025 (Unaudited)
December 31, 2024
June 30, 2025 (Unaudited)
December 31, 2024
 
Shares
Dollars ($)
Shares
Dollars ($)
Shares
Dollars ($)
Shares
Dollars ($)
Capital stock activity
Class A
Shares sold
40,597
1,082,703
72,601
1,877,055
728,395
12,113,229
1,560,668
25,017,144
Distributions reinvested
102,517
2,826,390
38,497
1,033,246
98,973
1,705,309
703,749
11,451,576
Shares redeemed
(301,894
)
(8,028,190
)
(745,084
)
(19,426,483
)
(2,233,295
)
(36,949,550
)
(5,986,998
)
(96,073,826
)
Net decrease
(158,780
)
(4,119,097
)
(633,986
)
(16,516,182
)
(1,405,927
)
(23,131,012
)
(3,722,581
)
(59,605,106
)
Advisor Class
Shares sold
8,189
221,213
1,363,908
21,181,473
Distributions reinvested
387
10,723
19,097
301,351
Shares redeemed
(44,025
)
(1,173,900
)
(5,875,625
)
(96,946,631
)
Net decrease
(35,449
)
(941,964
)
(4,492,620
)
(75,463,807
)
Class C
Shares sold
642
13,933
281,017
4,686,051
457,227
7,299,907
Distributions reinvested
22,270
385,272
126,698
2,073,544
Shares redeemed
(48,724
)
(1,079,132
)
(744,460
)
(12,402,753
)
(2,287,469
)
(36,778,190
)
Net decrease
(48,082
)
(1,065,199
)
(441,173
)
(7,331,430
)
(1,703,544
)
(27,404,739
)
Institutional Class
Shares sold
60,902
1,668,453
114,467
3,045,470
3,898,776
63,649,489
10,066,666
161,650,690
Distributions reinvested
48,375
1,363,202
26,520
726,909
153,595
2,595,756
1,142,666
18,218,419
Shares redeemed
(164,355
)
(4,406,554
)
(1,089,922
)
(29,535,423
)
(4,731,263
)
(76,659,993
)
(13,641,826
)
(215,349,951
)
Net decrease
(55,078
)
(1,374,899
)
(948,935
)
(25,763,044
)
(678,892
)
(10,414,748
)
(2,432,494
)
(35,480,842
)
Institutional 2 Class
Shares sold
3,439
96,384
10,380
281,427
719,096
11,910,371
1,629,460
25,850,054
Distributions reinvested
3,420
97,506
2,039
56,528
22,527
384,539
166,441
2,679,962
Shares redeemed
(41,311
)
(1,138,994
)
(80,948
)
(2,160,394
)
(871,962
)
(14,248,878
)
(2,646,019
)
(41,946,646
)
Net decrease
(34,452
)
(945,104
)
(68,529
)
(1,822,439
)
(130,339
)
(1,953,968
)
(850,118
)
(13,416,630
)
Institutional 3 Class
Shares sold
6,345
172,219
32,621
887,685
85,164
1,392,291
116,878
1,868,513
Distributions reinvested
9,145
260,730
4,132
114,544
3,049
51,930
23,111
371,235
Shares redeemed
(31,448
)
(870,071
)
(62,603
)
(1,700,783
)
(106,831
)
(1,735,071
)
(195,591
)
(3,100,122
)
Net decrease
(15,958
)
(437,122
)
(25,850
)
(698,554
)
(18,618
)
(290,850
)
(55,602
)
(860,374
)
Class S
Shares sold
5,031
138,305
507,130
14,077,388
523
8,364
832,840
13,754,131
Distributions reinvested
12,611
355,373
3,625
61,254
24,942
398,576
Shares redeemed
(30,198
)
(817,338
)
(42,877
)
(1,139,055
)
(64,126
)
(1,032,106
)
(55,493
)
(908,123
)
Net increase (decrease)
(12,556
)
(323,660
)
464,253
12,938,333
(59,978
)
(962,488
)
802,289
13,244,584
Total net decrease
(276,824
)
(7,199,882
)
(1,296,578
)
(33,869,049
)
(2,734,927
)
(44,084,496
)
(12,454,670
)
(198,986,914
)
The accompanying Notes to Financial Statements are an integral part of this statement.
32
Columbia Acorn Trust  | 2025

Statement of Changes in Net Assets  (continued)
 
 
Columbia Acorn
European FundSM
 
Six Months Ended
Year Ended
 
June 30, 2025 (Unaudited)
December 31, 2024
 
Shares
Dollars ($)
Shares
Dollars ($)
Capital stock activity
Class A
Shares sold
171,956
4,405,073
194,802
4,856,694
Distributions reinvested
23,930
597,993
Shares redeemed
(251,065
)
(6,266,634
)
(445,772
)
(11,331,707
)
Net decrease
(79,109
)
(1,861,561
)
(227,040
)
(5,877,020
)
Advisor Class
Shares sold
25,009
647,374
Distributions reinvested
580
15,559
Shares redeemed
(97,314
)
(2,474,422
)
Net decrease
(71,725
)
(1,811,489
)
Class C
Shares sold
106
2,516
Shares redeemed
(72,798
)
(1,709,763
)
Net decrease
(72,692
)
(1,707,247
)
Institutional Class
Shares sold
36,746
962,904
132,787
3,317,734
Distributions reinvested
19,359
485,098
Shares redeemed
(258,260
)
(6,630,530
)
(325,949
)
(8,389,451
)
Net decrease
(221,514
)
(5,667,626
)
(173,803
)
(4,586,619
)
Institutional 2 Class
Shares sold
3,862
100,981
Shares redeemed
(105,850
)
(2,599,932
)
Net decrease
(101,988
)
(2,498,951
)
Institutional 3 Class
Shares sold
3
50
Shares redeemed
(1,898
)
(45,780
)
Net decrease
(1,895
)
(45,730
)
Total net decrease
(300,623
)
(7,529,187
)
(649,143
)
(16,527,056
)
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
33

Financial Highlights
Columbia Acorn® Fund
The following tables are intended to help you understand the Funds’ financial performance. Certain information reflects financial results for a single share of a class held for the periods shown. Per share net investment income (loss) amounts are calculated based on average shares outstanding during the period. Total return assumes reinvestment of all dividends and distributions, if any. Total return does not reflect payment of sales charges, if any. Total return and portfolio turnover are not annualized for periods of less than one year. The ratios of expenses and net investment income are annualized for periods of less than one year. The portfolio turnover rate is calculated without regard to purchase and sales transactions of short-term instruments and certain derivatives, if any. If such transactions were included, a fund’s portfolio turnover rate may be higher.  
 
Net asset value,
beginning of
period
Net
investment
income
(loss)
Net
realized
and
unrealized
gain (loss)
Total from
investment
operations
Distributions
from net
investment
income
Distributions
from net
realized
gains
Total
distributions to
shareholders
Class A
Six Months Ended 6/30/2025 (Unaudited)
$8.55
(0.02
)(c)
(0.30
)
(0.32
)
Year Ended 12/31/2024
$7.49
(0.06
)
1.12
1.06
Year Ended 12/31/2023
$6.16
(0.03
)
1.36
1.33
Year Ended 12/31/2022
$10.01
(0.04
)
(3.34
)
(3.38
)
(0.47
)
(0.47
)
Year Ended 12/31/2021
$12.69
(0.10
)
1.07
0.97
(0.14
)
(3.51
)
(3.65
)
Year Ended 12/31/2020
$11.71
(0.06
)
3.24
3.18
(2.20
)
(2.20
)
Class C
Six Months Ended 6/30/2025 (Unaudited)
$11.77
(0.06
)(c)
(0.42
)
(0.48
)
Year Ended 12/31/2024
$10.39
(0.17
)
1.55
1.38
Year Ended 12/31/2023
$8.61
(0.11
)
1.89
1.78
Year Ended 12/31/2022
$13.72
(0.13
)
(4.57
)
(4.70
)
(0.41
)
(0.41
)
Year Ended 12/31/2021
$16.14
(0.26
)
1.40
1.14
(0.13
)
(3.43
)
(3.56
)
Year Ended 12/31/2020(g)
$16.57
(0.20
)
4.08
3.88
(4.31
)
(4.31
)
Institutional Class
Six Months Ended 6/30/2025 (Unaudited)
$12.51
(0.01
)(c)
(0.45
)
(0.46
)
Year Ended 12/31/2024
$10.93
(0.06
)
1.64
1.58
Year Ended 12/31/2023
$8.97
(0.02
)
1.98
1.96
Year Ended 12/31/2022
$14.22
(0.03
)
(4.75
)
(4.78
)
(0.47
)
(0.47
)
Year Ended 12/31/2021
$16.60
(0.09
)
1.43
1.34
(0.13
)
(3.59
)
(3.72
)
Year Ended 12/31/2020
$14.70
(0.04
)
4.14
4.10
(2.20
)
(2.20
)
Institutional 2 Class
Six Months Ended 6/30/2025 (Unaudited)
$13.81
(0.01
)(c)
(0.49
)
(0.50
)
Year Ended 12/31/2024
$12.06
(0.06
)
1.81
1.75
Year Ended 12/31/2023
$9.89
(0.02
)
2.19
2.17
Year Ended 12/31/2022
$15.62
(0.03
)
(5.23
)
(5.26
)
(0.47
)
(0.47
)
Year Ended 12/31/2021
$17.88
(0.10
)
1.57
1.47
(0.13
)
(3.60
)
(3.73
)
Year Ended 12/31/2020
$15.69
(0.04
)
4.43
4.39
(2.20
)
(2.20
)
Institutional 3 Class
Six Months Ended 6/30/2025 (Unaudited)
$14.06
(0.01
)(c)
(0.50
)
(0.51
)
Year Ended 12/31/2024
$12.28
(0.05
)
1.83
1.78
Year Ended 12/31/2023
$10.07
(0.02
)
2.23
2.21
Year Ended 12/31/2022
$15.88
(0.02
)
(5.32
)
(5.34
)
(0.47
)
(0.47
)
Year Ended 12/31/2021
$18.12
(0.09
)
1.60
1.51
(0.14
)
(3.61
)
(3.75
)
Year Ended 12/31/2020
$15.87
(0.04
)
4.49
4.45
(2.20
)
(2.20
)
The accompanying Notes to Financial Statements are an integral part of this statement.
34
Columbia Acorn Trust  | 2025

Financial Highlights (continued)
Columbia Acorn® Fund
 
 
Net
asset
value,
end of
period
Total
return
Total gross
expense
ratio to
average
net assets(a)
Total net
expense
ratio to
average
net assets(a),(b)
Net investment
income (loss)
ratio to
average
net assets
Portfolio
turnover
Net
assets,
end of
period
(000’s)
Class A
Six Months Ended 6/30/2025 (Unaudited)
$8.23
(3.74%
)
1.05%
1.05%
(0.41%
)(c)
43%
$483,457
Year Ended 12/31/2024
$8.55
14.15%
(d)
1.16%
1.08%
(e)
(0.74%
)
81%
$544,609
Year Ended 12/31/2023
$7.49
21.59%
(d)
1.15%
1.08%
(e)
(0.46%
)
64%
$570,240
Year Ended 12/31/2022
$6.16
(34.01%
)
1.08%
(f)
1.08%
(e),(f)
(0.53%
)
64%
$521,243
Year Ended 12/31/2021
$10.01
8.79%
1.08%
1.08%
(e)
(0.80%
)
75%
$919,643
Year Ended 12/31/2020
$12.69
29.18%
(d)
1.11%
1.11%
(e)
(0.56%
)
86%
$983,709
Class C
Six Months Ended 6/30/2025 (Unaudited)
$11.29
(4.08%
)
1.80%
1.80%
(1.17%
)(c)
43%
$5,546
Year Ended 12/31/2024
$11.77
13.28%
(d)
1.91%
1.83%
(e)
(1.49%
)
81%
$7,263
Year Ended 12/31/2023
$10.39
20.67%
(d)
1.90%
1.83%
(e)
(1.21%
)
64%
$8,991
Year Ended 12/31/2022
$8.61
(34.48%
)
1.83%
(f)
1.83%
(e),(f)
(1.29%
)
64%
$9,153
Year Ended 12/31/2021
$13.72
7.95%
1.83%
1.83%
(e)
(1.54%
)
75%
$24,546
Year Ended 12/31/2020
(g)
$16.14
28.27%
(d)
1.86%
1.86%
(e)
(1.30%
)
86%
$55,861
Institutional Class
Six Months Ended 6/30/2025 (Unaudited)
$12.05
(3.68%
)
0.80%
0.80%
(0.16%
)(c)
43%
$1,614,974
Year Ended 12/31/2024
$12.51
14.46%
(d)
0.91%
0.83%
(e)
(0.49%
)
81%
$1,767,918
Year Ended 12/31/2023
$10.93
21.85%
(d)
0.90%
0.83%
(e)
(0.21%
)
64%
$2,110,299
Year Ended 12/31/2022
$8.97
(33.78%
)
0.83%
(f)
0.83%
(e),(f)
(0.28%
)
64%
$1,865,518
Year Ended 12/31/2021
$14.22
8.99%
0.83%
0.83%
(e)
(0.55%
)
75%
$3,413,006
Year Ended 12/31/2020
$16.60
29.51%
(d)
0.86%
0.86%
(e)
(0.30%
)
86%
$3,569,794
Institutional 2 Class
Six Months Ended 6/30/2025 (Unaudited)
$13.31
(3.62%
)
0.77%
0.77%
(0.13%
)(c)
43%
$26,191
Year Ended 12/31/2024
$13.81
14.51%
(d)
0.89%
0.80%
(0.46%
)
81%
$27,386
Year Ended 12/31/2023
$12.06
21.94%
(d)
0.87%
0.81%
(0.18%
)
64%
$28,765
Year Ended 12/31/2022
$9.89
(33.83%
)(d)
0.81%
(f)
0.80%
(f)
(0.26%
)
64%
$23,445
Year Ended 12/31/2021
$15.62
9.09%
(d)
0.80%
0.80%
(0.52%
)
75%
$52,797
Year Ended 12/31/2020
$17.88
29.50%
(d)
0.83%
0.82%
(0.27%
)
86%
$61,000
Institutional 3 Class
Six Months Ended 6/30/2025 (Unaudited)
$13.55
(3.63%
)
0.72%
0.72%
(0.08%
)(c)
43%
$24,668
Year Ended 12/31/2024
$14.06
14.50%
(d)
0.84%
0.75%
(0.41%
)
81%
$29,552
Year Ended 12/31/2023
$12.28
21.95%
(d)
0.83%
0.76%
(0.17%
)
64%
$28,181
Year Ended 12/31/2022
$10.07
(33.77%
)
0.77%
(f)
0.77%
(f)
(0.23%
)
64%
$47,945
Year Ended 12/31/2021
$15.88
9.16%
0.75%
0.75%
(0.46%
)
75%
$78,955
Year Ended 12/31/2020
$18.12
29.54%
(d)
0.78%
0.78%
(0.25%
)
86%
$155,338
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
35

Financial Highlights (continued)
Columbia Acorn® Fund
 
 
Net asset value,
beginning of
period
Net
investment
income
(loss)
Net
realized
and
unrealized
gain (loss)
Total from
investment
operations
Distributions
from net
investment
income
Distributions
from net
realized
gains
Total
distributions to
shareholders
Class S
Six Months Ended 6/30/2025 (Unaudited)
$12.51
(0.01
)(c)
(0.44
)
(0.45
)
Year Ended 12/31/2024(h)
$12.23
(0.01
)
0.29
0.28
 
Notes to Financial Highlights
(a)
In addition to the fees and expenses that the Fund bears directly, the Fund indirectly bears a pro rata share of the fees and expenses of any other funds in which it invests. Such indirect expenses are not included in the Fund’s reported expense ratios.
(b)
Total net expenses include the impact of certain fee waivers/expense reimbursements made by the Investment Manager and certain of its affiliates, if applicable.
(c)
Includes income resulting from European Union tax reclaims. The effect of these amounted to:
 
Class
Net Investment income per share ($)
Net Investment income ratio (%)
Six Months Ended 6/30/2025 (Unaudited)
Class A
lessthan
 0.01
0.10
Class C
0.01
0.10
Institutional Class
0.01
0.10
Institutional 2 Class
0.01
0.10
Institutional 3 Class
0.01
0.10
Class S
0.01
0.10
 
(d)
Had the Investment Manager and/or Transfer Agent not waived fees and/or reimbursed a portion of expenses, total return would have been reduced.
(e)
The benefits derived from expense reductions had an impact of less than 0.01%.
(f)
Ratios include Trustees’ fees deferred during the current period as well as any gains or losses on the Trustees’ deferred compensation balances as a result of market fluctuations. If these had been excluded, expenses would have been higher by 0.03%.
(g)
Per share amounts have been adjusted on a retroactive basis to reflect a 4 to 1 reverse stock split completed after the close of business on September 11, 2020.
(h)
Class S shares commenced operations on October 2, 2024. Per share data and total return reflect activity from that date.
The accompanying Notes to Financial Statements are an integral part of this statement.
36
Columbia Acorn Trust  | 2025

Financial Highlights (continued)
Columbia Acorn® Fund
 
 
Net
asset
value,
end of
period
Total
return
Total gross
expense
ratio to
average
net assets(a)
Total net
expense
ratio to
average
net assets(a),(b)
Net investment
income (loss)
ratio to
average
net assets
Portfolio
turnover
Net
assets,
end of
period
(000’s)
Class S
Six Months Ended 6/30/2025 (Unaudited)
$12.06
(3.60%
)
0.80%
0.80%
(0.17%
)(c)
43%
$306,898
Year Ended 12/31/2024
(h)
$12.51
2.29%
(d)
0.95%
0.83%
(0.41%
)
81%
$352,105
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
37

Financial Highlights
Columbia Acorn International®
 
 
Net asset value,
beginning of
period
Net
investment
income
(loss)
Net
realized
and
unrealized
gain (loss)
Total from
investment
operations
Distributions
from net
investment
income
Distributions
from net
realized
gains
Total
distributions to
shareholders
Class A
Six Months Ended 6/30/2025 (Unaudited)
$21.54
0.12
3.54
3.66
(0.08
)
(0.53
)
(0.61
)
Year Ended 12/31/2024
$25.46
0.18
(d)
(1.41
)
(1.23
)
(0.71
)
(1.98
)
(2.69
)
Year Ended 12/31/2023
$21.34
0.09
4.03
4.12
Year Ended 12/31/2022
$33.19
0.17
(g)
(11.35
)
(11.18
)
(0.67
)
(0.67
)
Year Ended 12/31/2021
$34.31
0.01
4.08
4.09
(0.38
)
(4.83
)
(5.21
)
Year Ended 12/31/2020
$34.20
0.06
4.51
4.57
(0.20
)
(4.26
)
(4.46
)
Institutional Class
Six Months Ended 6/30/2025 (Unaudited)
$21.68
0.15
3.55
3.70
(0.08
)
(0.53
)
(0.61
)
Year Ended 12/31/2024
$25.66
0.26
(d)
(1.43
)
(1.17
)
(0.83
)
(1.98
)
(2.81
)
Year Ended 12/31/2023
$21.46
0.15
4.05
4.20
Year Ended 12/31/2022
$33.28
0.23
(g)
(11.38
)
(11.15
)
(0.67
)
(0.67
)
Year Ended 12/31/2021
$34.47
0.10
4.09
4.19
(0.55
)
(4.83
)
(5.38
)
Year Ended 12/31/2020
$34.25
0.14
4.54
4.68
(0.20
)
(4.26
)
(4.46
)
Institutional 2 Class
Six Months Ended 6/30/2025 (Unaudited)
$21.66
0.16
3.55
3.71
(0.08
)
(0.53
)
(0.61
)
Year Ended 12/31/2024
$25.66
0.26
(d)
(1.42
)
(1.16
)
(0.86
)
(1.98
)
(2.84
)
Year Ended 12/31/2023
$21.45
0.17
4.04
4.21
Year Ended 12/31/2022
$33.25
0.24
(g)
(11.37
)
(11.13
)
(0.67
)
(0.67
)
Year Ended 12/31/2021
$34.46
0.12
4.09
4.21
(0.59
)
(4.83
)
(5.42
)
Year Ended 12/31/2020
$34.22
0.16
4.54
4.70
(0.20
)
(4.26
)
(4.46
)
Institutional 3 Class
Six Months Ended 6/30/2025 (Unaudited)
$22.12
0.17
3.62
3.79
(0.08
)
(0.53
)
(0.61
)
Year Ended 12/31/2024
$26.15
0.28
(d)
(1.45
)
(1.17
)
(0.88
)
(1.98
)
(2.86
)
Year Ended 12/31/2023
$21.84
0.18
4.13
4.31
Year Ended 12/31/2022
$33.83
0.26
(g)
(11.58
)
(11.32
)
(0.67
)
(0.67
)
Year Ended 12/31/2021
$34.99
0.15
4.14
4.29
(0.62
)
(4.83
)
(5.45
)
Year Ended 12/31/2020
$34.67
0.19
4.59
4.78
(0.20
)
(4.26
)
(4.46
)
The accompanying Notes to Financial Statements are an integral part of this statement.
38
Columbia Acorn Trust  | 2025

Financial Highlights (continued)
Columbia Acorn International®
 
 
Net
asset
value,
end of
period
Total
return
Total gross
expense
ratio to
average
net assets(a)
Total net
expense
ratio to
average
net assets(a),(b)
Net investment
income (loss)
ratio to
average
net assets
Portfolio
turnover
Net
assets,
end of
period
(000’s)
Class A
Six Months Ended 6/30/2025 (Unaudited)
$24.59
17.07%
1.25%
(c)
1.22%
(c)
1.08%
9%
$132,673
Year Ended 12/31/2024
$21.54
(5.09%
)
1.38%
(c)
1.22%
(c),(e)
0.73%
(d)
28%
$123,302
Year Ended 12/31/2023
$25.46
19.31%
1.37%
(c),(f)
1.24%
(c),(e),(f)
0.41%
46%
$155,877
Year Ended 12/31/2022
$21.34
(33.81%
)
1.27%
(c),(f),(h)
1.23%
(c),(e),(f),(h)
0.71%
29%
$151,725
Year Ended 12/31/2021
$33.19
12.63%
1.24%
(c)
1.23%
(c),(e)
0.03%
27%
$282,125
Year Ended 12/31/2020
$34.31
14.68%
1.28%
(c)
1.24%
(c),(e)
0.21%
55%
$283,478
Institutional Class
Six Months Ended 6/30/2025 (Unaudited)
$24.77
17.15%
1.00%
(c)
0.96%
(c)
1.34%
9%
$579,520
Year Ended 12/31/2024
$21.68
(4.82%
)
1.13%
(c)
0.97%
(c),(e)
1.01%
(d)
28%
$525,326
Year Ended 12/31/2023
$25.66
19.57%
1.12%
(c),(f)
0.99%
(c),(e),(f)
0.66%
46%
$837,217
Year Ended 12/31/2022
$21.46
(33.63%
)
1.03%
(c),(f),(h)
0.98%
(c),(e),(f),(h)
0.96%
29%
$906,415
Year Ended 12/31/2021
$33.28
12.89%
0.99%
(c)
0.98%
(c),(e)
0.28%
27%
$1,727,042
Year Ended 12/31/2020
$34.47
14.99%
1.03%
(c)
0.99%
(c),(e)
0.46%
55%
$1,760,927
Institutional 2 Class
Six Months Ended 6/30/2025 (Unaudited)
$24.76
17.21%
0.94%
(c)
0.90%
(c)
1.42%
9%
$19,398
Year Ended 12/31/2024
$21.66
(4.79%
)
1.09%
(c)
0.92%
(c)
1.03%
(d)
28%
$16,507
Year Ended 12/31/2023
$25.66
19.63%
1.05%
(c),(f)
0.92%
(c),(f)
0.75%
46%
$22,937
Year Ended 12/31/2022
$21.45
(33.60%
)
0.97%
(c),(f),(h)
0.92%
(c),(f),(h)
1.04%
29%
$80,059
Year Ended 12/31/2021
$33.25
12.97%
0.95%
(c)
0.92%
(c)
0.34%
27%
$126,973
Year Ended 12/31/2020
$34.46
15.06%
0.97%
(c)
0.92%
(c)
0.53%
55%
$129,576
Institutional 3 Class
Six Months Ended 6/30/2025 (Unaudited)
$25.30
17.21%
0.88%
(c)
0.85%
(c)
1.46%
9%
$79,108
Year Ended 12/31/2024
$22.12
(4.75%
)
1.03%
(c)
0.88%
(c)
1.07%
(d)
28%
$108,049
Year Ended 12/31/2023
$26.15
19.73%
1.01%
(c),(f)
0.89%
(c),(f)
0.77%
46%
$131,038
Year Ended 12/31/2022
$21.84
(33.58%
)
0.92%
(c),(f),(h)
0.88%
(c),(f),(h)
1.10%
29%
$133,738
Year Ended 12/31/2021
$33.83
13.00%
0.90%
(c)
0.88%
(c)
0.40%
27%
$179,991
Year Ended 12/31/2020
$34.99
15.10%
0.93%
(c)
0.88%
(c)
0.60%
55%
$277,614
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
39

Financial Highlights (continued)
Columbia Acorn International®
 
 
Net asset value,
beginning of
period
Net
investment
income
(loss)
Net
realized
and
unrealized
gain (loss)
Total from
investment
operations
Distributions
from net
investment
income
Distributions
from net
realized
gains
Total
distributions to
shareholders
Class S
Six Months Ended 6/30/2025 (Unaudited)
$21.68
0.15
3.55
3.70
(0.08
)
(0.53
)
(0.61
)
Year Ended 12/31/2024(i)
$26.68
0.00
(d),(j)
(3.14
)
(3.14
)
(0.31
)
(1.55
)
(1.86
)
 
Notes to Financial Highlights
(a)
In addition to the fees and expenses that the Fund bears directly, the Fund indirectly bears a pro rata share of the fees and expenses of any other funds in which it invests. Such indirect expenses are not included in the Fund’s reported expense ratios.
(b)
Total net expenses include the impact of certain fee waivers/expense reimbursements made by the Investment Manager and certain of its affiliates, if applicable.
(c)
Ratios include line of credit interest expense. For the periods indicated below, if line of credit interest expense had been excluded, expenses would have been lower by:
 
Class
6/30/2025
12/31/2024
12/31/2023
12/31/2022
12/31/2021
12/31/2020
Class A
less than 0.01%
less than 0.01%
0.01%
less than 0.01%
—%
less than 0.01%
Institutional Class
less than 0.01%
less than 0.01%
0.01%
less than 0.01%
—%
less than 0.01%
Institutional 2 Class
less than 0.01%
less than 0.01%
less than 0.01%
less than 0.01%
—%
less than 0.01%
Institutional 3 Class
less than 0.01%
less than 0.01%
0.01%
less than 0.01%
—%
less than 0.01%
Class S
less than 0.01%
less than 0.01%
—%
—%
—%
—%
 
(d)
Includes income resulting from European Union tax reclaims. The effect of these amounted to:
 
Class
Net Investment income per share ($)
Net Investment income ratio (%)
Year Ended 12/31/2024
Class A
0.04
0.17
Institutional Class
0.04
0.17
Institutional 2 Class
0.04
0.17
Institutional 3 Class
0.04
0.17
Class S
0.01
0.17
 
(e)
The benefits derived from expense reductions had an impact of less than 0.01%.
(f)
Ratios include interest on collateral expense which is less than 0.01%.
(g)
Net investment income per share includes European Union tax reclaims. The effect of these reclaims amounted to $0.02 per share.
(h)
Ratios include Trustees’ fees deferred during the current period as well as any gains or losses on the Trustees’ deferred compensation balances as a result of market fluctuations. If these had been excluded, expenses would have been higher by 0.03%.
(i)
Class S shares commenced operations on October 2, 2024. Per share data and total return reflect activity from that date.
(j)
Rounds to zero.
The accompanying Notes to Financial Statements are an integral part of this statement.
40
Columbia Acorn Trust  | 2025

Financial Highlights (continued)
Columbia Acorn International®
 
 
Net
asset
value,
end of
period
Total
return
Total gross
expense
ratio to
average
net assets(a)
Total net
expense
ratio to
average
net assets(a),(b)
Net investment
income (loss)
ratio to
average
net assets
Portfolio
turnover
Net
assets,
end of
period
(000’s)
Class S
Six Months Ended 6/30/2025 (Unaudited)
$24.77
17.15%
1.00%
(c)
0.97%
(c)
1.32%
9%
$114,980
Year Ended 12/31/2024
(i)
$21.68
(11.76%
)
1.20%
(c)
0.97%
(c)
0.08%
(d)
28%
$111,119
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
41

Financial Highlights
Columbia Acorn International SelectSM
 
 
Net asset value,
beginning of
period
Net
investment
income
(loss)
Net
realized
and
unrealized
gain (loss)
Total from
investment
operations
Distributions
from net
investment
income
Distributions
from net
realized
gains
Total
distributions to
shareholders
Class A
Six Months Ended 6/30/2025 (Unaudited)
$25.18
0.32
(c)
3.32
3.64
(0.74
)
(0.74
)
Year Ended 12/31/2024
$25.48
0.23
(0.29
)
(0.06
)
(0.24
)
(0.24
)
Year Ended 12/31/2023
$21.57
0.07
3.84
3.91
Year Ended 12/31/2022
$35.43
0.12
(f)
(13.06
)
(12.94
)
(0.92
)
(0.92
)
Year Ended 12/31/2021
$33.67
(0.05
)
3.50
3.45
(0.28
)
(1.41
)
(1.69
)
Year Ended 12/31/2020
$28.58
(0.03
)
5.21
5.18
(0.09
)
(0.09
)
Institutional Class
Six Months Ended 6/30/2025 (Unaudited)
$25.75
0.36
(c)
3.39
3.75
(0.80
)
(0.80
)
Year Ended 12/31/2024
$26.04
0.31
(0.30
)
0.01
(0.30
)
(0.30
)
Year Ended 12/31/2023
$21.99
0.13
3.92
4.05
Year Ended 12/31/2022
$36.01
0.18
(f)
(13.28
)
(13.10
)
(0.92
)
(0.92
)
Year Ended 12/31/2021
$34.25
0.04
3.56
3.60
(0.43
)
(1.41
)
(1.84
)
Year Ended 12/31/2020
$29.00
0.03
5.31
5.34
(0.09
)
(0.09
)
Institutional 2 Class
Six Months Ended 6/30/2025 (Unaudited)
$26.07
0.37
(c)
3.44
3.81
(0.84
)
(0.84
)
Year Ended 12/31/2024
$26.34
0.34
(0.28
)
0.06
(0.33
)
(0.33
)
Year Ended 12/31/2023
$22.22
0.15
3.97
4.12
Year Ended 12/31/2022
$36.33
0.20
(f)
(13.39
)
(13.19
)
(0.92
)
(0.92
)
Year Ended 12/31/2021
$34.57
0.06
3.60
3.66
(0.49
)
(1.41
)
(1.90
)
Year Ended 12/31/2020
$29.24
0.08
5.34
5.42
(0.09
)
(0.09
)
Institutional 3 Class
Six Months Ended 6/30/2025 (Unaudited)
$26.07
0.39
(c)
3.43
3.82
(0.85
)
(0.85
)
Year Ended 12/31/2024
$26.35
0.35
(0.29
)
0.06
(0.34
)
(0.34
)
Year Ended 12/31/2023
$22.21
0.17
3.97
4.14
Year Ended 12/31/2022
$36.31
0.21
(f)
(13.39
)
(13.18
)
(0.92
)
(0.92
)
Year Ended 12/31/2021
$34.56
0.09
3.59
3.68
(0.52
)
(1.41
)
(1.93
)
Year Ended 12/31/2020
$29.22
0.07
5.36
5.43
(0.09
)
(0.09
)
The accompanying Notes to Financial Statements are an integral part of this statement.
42
Columbia Acorn Trust  | 2025

Financial Highlights (continued)
Columbia Acorn International SelectSM
 
 
Net
asset
value,
end of
period
Total
return
Total gross
expense
ratio to
average
net assets(a)
Total net
expense
ratio to
average
net assets(a),(b)
Net investment
income (loss)
ratio to
average
net assets
Portfolio
turnover
Net
assets,
end of
period
(000’s)
Class A
Six Months Ended 6/30/2025 (Unaudited)
$28.08
14.50%
1.47%
(d)
1.16%
(d)
2.44%
(c)
9%
$118,891
Year Ended 12/31/2024
$25.18
(0.30%
)
1.55%
(d)
1.23%
(d),(e)
0.86%
69%
$110,629
Year Ended 12/31/2023
$25.48
18.13%
1.55%
(d)
1.23%
(d),(e)
0.30%
43%
$128,076
Year Ended 12/31/2022
$21.57
(36.80%
)
1.50%
(d),(g)
1.24%
(d),(e),(g)
0.48%
21%
$124,963
Year Ended 12/31/2021
$35.43
10.49%
1.44%
(d)
1.23%
(d),(e)
(0.15%
)
27%
$235,103
Year Ended 12/31/2020
$33.67
18.21%
1.48%
1.26%
(e)
(0.10%
)
68%
$230,519
Institutional Class
Six Months Ended 6/30/2025 (Unaudited)
$28.70
14.63%
1.22%
(d)
0.91%
(d)
2.69%
(c)
9%
$59,099
Year Ended 12/31/2024
$25.75
(0.04%
)
1.29%
(d)
0.98%
(d),(e)
1.14%
69%
$54,447
Year Ended 12/31/2023
$26.04
18.42%
1.30%
(d)
0.98%
(d),(e)
0.55%
43%
$79,765
Year Ended 12/31/2022
$21.99
(36.65%
)
1.25%
(d),(g)
0.99%
(d),(e),(g)
0.73%
21%
$79,829
Year Ended 12/31/2021
$36.01
10.79%
1.19%
(d)
0.98%
(d),(e)
0.10%
27%
$159,876
Year Ended 12/31/2020
$34.25
18.50%
1.23%
1.02%
(e)
0.12%
68%
$155,133
Institutional 2 Class
Six Months Ended 6/30/2025 (Unaudited)
$29.04
14.67%
1.08%
(d)
0.77%
(d)
2.74%
(c)
9%
$3,415
Year Ended 12/31/2024
$26.07
0.14%
1.16%
(d)
0.84%
(d)
1.25%
69%
$3,963
Year Ended 12/31/2023
$26.34
18.54%
1.16%
(d)
0.86%
(d)
0.64%
43%
$5,810
Year Ended 12/31/2022
$22.22
(36.57%
)
1.11%
(d),(g)
0.89%
(d),(g)
0.78%
21%
$9,225
Year Ended 12/31/2021
$36.33
10.87%
1.10%
(d)
0.89%
(d)
0.17%
27%
$51,805
Year Ended 12/31/2020
$34.57
18.63%
1.15%
0.93%
0.27%
68%
$77,420
Institutional 3 Class
Six Months Ended 6/30/2025 (Unaudited)
$29.04
14.72%
1.02%
(d)
0.71%
(d)
2.89%
(c)
9%
$9,152
Year Ended 12/31/2024
$26.07
0.14%
1.11%
(d)
0.79%
(d)
1.31%
69%
$8,631
Year Ended 12/31/2023
$26.35
18.64%
1.11%
(d)
0.81%
(d)
0.70%
43%
$9,404
Year Ended 12/31/2022
$22.21
(36.56%
)
1.06%
(d),(g)
0.84%
(d),(g)
0.81%
21%
$11,188
Year Ended 12/31/2021
$36.31
10.93%
1.05%
(d)
0.84%
(d)
0.24%
27%
$28,694
Year Ended 12/31/2020
$34.56
18.67%
1.09%
0.89%
0.24%
68%
$27,064
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
43

Financial Highlights (continued)
Columbia Acorn International SelectSM
 
 
Net asset value,
beginning of
period
Net
investment
income
(loss)
Net
realized
and
unrealized
gain (loss)
Total from
investment
operations
Distributions
from net
investment
income
Distributions
from net
realized
gains
Total
distributions to
shareholders
Class S
Six Months Ended 6/30/2025 (Unaudited)
$25.75
0.36
(c)
3.39
3.75
(0.80
)
(0.80
)
Year Ended 12/31/2024(h)
$27.97
0.03
(2.25
)
(2.22
)
 
Notes to Financial Highlights
(a)
In addition to the fees and expenses that the Fund bears directly, the Fund indirectly bears a pro rata share of the fees and expenses of any other funds in which it invests. Such indirect expenses are not included in the Fund’s reported expense ratios.
(b)
Total net expenses include the impact of certain fee waivers/expense reimbursements made by the Investment Manager and certain of its affiliates, if applicable.
(c)
Includes income resulting from European Union tax reclaims. The effect of these amounted to:
 
Class
Net Investment income per share ($)
Net Investment income ratio (%)
Six Months Ended 6/30/2025 (Unaudited)
Class A
0.13
0.95
Institutional Class
0.13
0.95
Institutional 2 Class
0.13
0.95
Institutional 3 Class
0.13
0.95
Class S
0.13
0.95
 
(d)
Ratios include line of credit interest expense which is less than 0.01%.
(e)
The benefits derived from expense reductions had an impact of less than 0.01%.
(f)
Net investment income per share includes European Union tax reclaims. The effect of these reclaims amounted to $0.02 per share.
(g)
Ratios include Trustees’ fees deferred during the current period as well as any gains or losses on the Trustees’ deferred compensation balances as a result of market fluctuations. If these had been excluded, expenses would have been higher by 0.02%.
(h)
Class S shares commenced operations on October 2, 2024. Per share data and total return reflect activity from that date.
The accompanying Notes to Financial Statements are an integral part of this statement.
44
Columbia Acorn Trust  | 2025

Financial Highlights (continued)
Columbia Acorn International SelectSM
 
 
Net
asset
value,
end of
period
Total
return
Total gross
expense
ratio to
average
net assets(a)
Total net
expense
ratio to
average
net assets(a),(b)
Net investment
income (loss)
ratio to
average
net assets
Portfolio
turnover
Net
assets,
end of
period
(000’s)
Class S
Six Months Ended 6/30/2025 (Unaudited)
$28.70
14.63%
1.22%
(d)
0.91%
(d)
2.69%
(c)
9%
$12,964
Year Ended 12/31/2024
(h)
$25.75
(7.94%
)
1.38%
0.98%
0.47%
69%
$11,956
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
45

Financial Highlights
Columbia Thermostat FundSM
 
 
Net asset value,
beginning of
period
Net
investment
income
Net
realized
and
unrealized
gain (loss)
Total from
investment
operations
Distributions
from net
investment
income
Distributions
from net
realized
gains
Total
distributions to
shareholders
Class A
Six Months Ended 6/30/2025 (Unaudited)
$16.28
0.20
1.20
1.40
(0.08
)
(0.08
)
Year Ended 12/31/2024
$15.61
0.46
0.74
1.20
(0.53
)
(0.53
)
Year Ended 12/31/2023
$14.36
0.39
1.24
1.63
(0.38
)
(0.38
)
Year Ended 12/31/2022
$17.01
0.26
(2.49
)
(2.23
)
(0.28
)
(0.14
)
(0.42
)
Year Ended 12/31/2021
$18.31
0.24
0.89
1.13
(0.26
)
(2.17
)
(2.43
)
Year Ended 12/31/2020
$15.12
0.26
4.13
4.39
(0.27
)
(0.93
)
(1.20
)
Class C
Six Months Ended 6/30/2025 (Unaudited)
$16.40
0.14
1.20
1.34
(0.08
)
(0.08
)
Year Ended 12/31/2024
$15.73
0.34
0.74
1.08
(0.41
)
(0.41
)
Year Ended 12/31/2023
$14.48
0.27
1.25
1.52
(0.27
)
(0.27
)
Year Ended 12/31/2022
$17.14
0.14
(2.49
)
(2.35
)
(0.17
)
(0.14
)
(0.31
)
Year Ended 12/31/2021
$18.43
0.09
0.90
0.99
(0.11
)
(2.17
)
(2.28
)
Year Ended 12/31/2020
$15.23
0.12
4.16
4.28
(0.15
)
(0.93
)
(1.08
)
Institutional Class
Six Months Ended 6/30/2025 (Unaudited)
$15.95
0.22
1.17
1.39
(0.08
)
(0.08
)
Year Ended 12/31/2024
$15.30
0.50
0.72
1.22
(0.57
)
(0.57
)
Year Ended 12/31/2023
$14.08
0.42
1.22
1.64
(0.42
)
(0.42
)
Year Ended 12/31/2022
$16.69
0.29
(2.44
)
(2.15
)
(0.32
)
(0.14
)
(0.46
)
Year Ended 12/31/2021
$18.01
0.28
0.87
1.15
(0.30
)
(2.17
)
(2.47
)
Year Ended 12/31/2020
$14.88
0.31
4.07
4.38
(0.32
)
(0.93
)
(1.25
)
Institutional 2 Class
Six Months Ended 6/30/2025 (Unaudited)
$16.10
0.22
1.19
1.41
(0.08
)
(0.08
)
Year Ended 12/31/2024
$15.44
0.50
0.73
1.23
(0.57
)
(0.57
)
Year Ended 12/31/2023
$14.21
0.43
1.22
1.65
(0.42
)
(0.42
)
Year Ended 12/31/2022
$16.84
0.29
(2.45
)
(2.16
)
(0.33
)
(0.14
)
(0.47
)
Year Ended 12/31/2021
$18.14
0.29
0.89
1.18
(0.31
)
(2.17
)
(2.48
)
Year Ended 12/31/2020
$14.99
0.31
4.09
4.40
(0.32
)
(0.93
)
(1.25
)
Institutional 3 Class
Six Months Ended 6/30/2025 (Unaudited)
$16.06
0.23
1.19
1.42
(0.08
)
(0.08
)
Year Ended 12/31/2024
$15.41
0.51
0.72
1.23
(0.58
)
(0.58
)
Year Ended 12/31/2023
$14.18
0.44
1.22
1.66
(0.43
)
(0.43
)
Year Ended 12/31/2022
$16.80
0.31
(2.45
)
(2.14
)
(0.34
)
(0.14
)
(0.48
)
Year Ended 12/31/2021
$18.11
0.36
0.82
1.18
(0.32
)
(2.17
)
(2.49
)
Year Ended 12/31/2020
$14.96
0.33
4.08
4.41
(0.33
)
(0.93
)
(1.26
)
The accompanying Notes to Financial Statements are an integral part of this statement.
46
Columbia Acorn Trust  | 2025

Financial Highlights (continued)
Columbia Thermostat FundSM
 
 
Net
asset
value,
end of
period
Total
return
Total gross
expense
ratio to
average
net assets(a)
Total net
expense
ratio to
average
net assets(a),(b)
Net investment
income
ratio to
average
net assets
Portfolio
turnover
Net
assets,
end of
period
(000’s)
Class A
Six Months Ended 6/30/2025 (Unaudited)
$17.60
8.63%
0.49%
(c)
0.49%
(c)
2.45%
60%
$392,341
Year Ended 12/31/2024
$16.28
7.68%
0.56%
(c)
0.50%
(c),(d)
2.83%
114%
$385,771
Year Ended 12/31/2023
$15.61
11.38%
0.57%
(c)
0.49%
(c),(d)
2.59%
148%
$428,092
Year Ended 12/31/2022
$14.36
(13.14%
)
0.54%
(c),(e)
0.50%
(c),(d),(e)
1.70%
88%
$450,566
Year Ended 12/31/2021
$17.01
6.16%
0.54%
(c)
0.50%
(c),(d)
1.26%
49%
$624,373
Year Ended 12/31/2020
$18.31
29.27%
0.56%
(c)
0.50%
(c),(d)
1.53%
97%
$505,238
Class C
Six Months Ended 6/30/2025 (Unaudited)
$17.66
8.20%
1.24%
(c)
1.24%
(c)
1.70%
60%
$86,892
Year Ended 12/31/2024
$16.40
6.86%
1.31%
(c)
1.25%
(c),(d)
2.07%
114%
$87,900
Year Ended 12/31/2023
$15.73
10.52%
1.32%
(c)
1.24%
(c),(d)
1.82%
148%
$111,123
Year Ended 12/31/2022
$14.48
(13.75%
)
1.29%
(c),(e)
1.25%
(c),(d),(e)
0.93%
88%
$126,802
Year Ended 12/31/2021
$17.14
5.40%
1.29%
(c)
1.25%
(c),(d)
0.48%
49%
$189,990
Year Ended 12/31/2020
$18.43
28.28%
1.31%
(c)
1.25%
(c),(d)
0.72%
97%
$208,937
Institutional Class
Six Months Ended 6/30/2025 (Unaudited)
$17.26
8.74%
0.24%
(c)
0.24%
(c)
2.69%
60%
$664,365
Year Ended 12/31/2024
$15.95
7.97%
0.31%
(c)
0.25%
(c),(d)
3.12%
114%
$624,613
Year Ended 12/31/2023
$15.30
11.66%
0.32%
(c)
0.24%
(c),(d)
2.85%
148%
$636,587
Year Ended 12/31/2022
$14.08
(12.92%
)
0.29%
(c),(e)
0.25%
(c),(d),(e)
1.93%
88%
$600,671
Year Ended 12/31/2021
$16.69
6.42%
0.29%
(c)
0.25%
(c),(d)
1.52%
49%
$902,841
Year Ended 12/31/2020
$18.01
29.63%
0.31%
(c)
0.25%
(c),(d)
1.80%
97%
$729,119
Institutional 2 Class
Six Months Ended 6/30/2025 (Unaudited)
$17.43
8.78%
0.20%
(c)
0.19%
(c)
2.74%
60%
$81,025
Year Ended 12/31/2024
$16.10
8.01%
0.27%
(c)
0.20%
(c)
3.11%
114%
$76,935
Year Ended 12/31/2023
$15.44
11.67%
0.28%
(c)
0.20%
(c)
2.88%
148%
$86,925
Year Ended 12/31/2022
$14.21
(12.88%
)
0.25%
(c),(e)
0.20%
(c),(e)
1.94%
88%
$90,290
Year Ended 12/31/2021
$16.84
6.53%
0.25%
(c)
0.20%
(c)
1.53%
49%
$169,246
Year Ended 12/31/2020
$18.14
29.59%
0.27%
(c)
0.21%
(c)
1.82%
97%
$129,197
Institutional 3 Class
Six Months Ended 6/30/2025 (Unaudited)
$17.40
8.87%
0.16%
(c)
0.14%
(c)
2.79%
60%
$11,169
Year Ended 12/31/2024
$16.06
8.00%
0.23%
(c)
0.16%
(c)
3.18%
114%
$10,613
Year Ended 12/31/2023
$15.41
11.73%
0.24%
(c)
0.16%
(c)
2.96%
148%
$11,038
Year Ended 12/31/2022
$14.18
(12.82%
)
0.21%
(c),(e)
0.16%
(c),(e)
2.04%
88%
$10,184
Year Ended 12/31/2021
$16.80
6.52%
0.21%
(c)
0.17%
(c)
1.94%
49%
$15,581
Year Ended 12/31/2020
$18.11
29.69%
0.24%
(c)
0.17%
(c)
1.89%
97%
$2,862
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
47

Financial Highlights (continued)
Columbia Thermostat FundSM
 
 
Net asset value,
beginning of
period
Net
investment
income
Net
realized
and
unrealized
gain (loss)
Total from
investment
operations
Distributions
from net
investment
income
Distributions
from net
realized
gains
Total
distributions to
shareholders
Class S
Six Months Ended 6/30/2025 (Unaudited)
$15.95
0.22
1.17
1.39
(0.08
)
(0.08
)
Year Ended 12/31/2024(f)
$16.61
0.17
(0.33
)(g)
(0.16
)
(0.50
)
(0.50
)
 
Notes to Financial Highlights
(a)
In addition to the fees and expenses that the Fund bears directly, the Fund indirectly bears a pro rata share of the fees and expenses of any other funds in which it invests. Such indirect expenses are not included in the Fund’s reported expense ratios.
(b)
Total net expenses include the impact of certain fee waivers/expense reimbursements made by the Investment Manager and certain of its affiliates, if applicable.
(c)
Ratios include line of credit interest expense which is less than 0.01%.
(d)
The benefits derived from expense reductions had an impact of less than 0.01%.
(e)
Ratios include Trustees’ fees deferred during the current period as well as any gains or losses on the Trustees’ deferred compensation balances as a result of market fluctuations. If these had been excluded, expenses would have been higher by 0.01%.
(f)
Class S shares commenced operations on October 2, 2024. Per share data and total return reflect activity from that date.
(g)
Calculation of the net gain (loss) per share (both realized and unrealized) does not correlate to the aggregate realized and unrealized gain (loss) presented in the Statement of Operations due to timing of Fund shares sold and redeemed in relation to fluctuations in the market value of the portfolio. For a new share class, the difference may be due to the timing of the commencement of operations for the share class.
The accompanying Notes to Financial Statements are an integral part of this statement.
48
Columbia Acorn Trust  | 2025

Financial Highlights (continued)
Columbia Thermostat FundSM
 
 
Net
asset
value,
end of
period
Total
return
Total gross
expense
ratio to
average
net assets(a)
Total net
expense
ratio to
average
net assets(a),(b)
Net investment
income
ratio to
average
net assets
Portfolio
turnover
Net
assets,
end of
period
(000’s)
Class S
Six Months Ended 6/30/2025 (Unaudited)
$17.26
8.74%
0.24%
(c)
0.24%
(c)
2.70%
60%
$12,813
Year Ended 12/31/2024
(f)
$15.95
(0.95%
)
0.34%
(c)
0.25%
(c)
4.44%
114%
$12,794
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
49

Financial Highlights
Columbia Acorn European FundSM
 
 
Net asset value,
beginning of
period
Net
investment
income
(loss)
Net
realized
and
unrealized
gain (loss)
Total from
investment
operations
Distributions
from net
investment
income
Total
distributions to
shareholders
Class A
Six Months Ended 6/30/2025 (Unaudited)
$23.87
0.33
4.77
5.10
Year Ended 12/31/2024
$25.55
0.02
(1.12
)
(1.10
)
(0.58
)
(0.58
)
Year Ended 12/31/2023
$20.61
0.06
5.04
5.10
(0.16
)
(0.16
)
Year Ended 12/31/2022
$33.33
0.06
(e)
(12.78
)
(12.72
)
Year Ended 12/31/2021
$27.49
(0.14
)
6.04
5.90
(0.06
)
(0.06
)
Year Ended 12/31/2020
$22.52
(0.12
)
5.22
5.10
(0.13
)
(0.13
)
Institutional Class
Six Months Ended 6/30/2025 (Unaudited)
$24.06
0.34
4.85
5.19
Year Ended 12/31/2024
$25.76
0.08
(1.14
)
(1.06
)
(0.64
)
(0.64
)
Year Ended 12/31/2023
$20.77
0.11
5.10
5.21
(0.22
)
(0.22
)
Year Ended 12/31/2022
$33.51
0.11
(e)
(12.85
)
(12.74
)
Year Ended 12/31/2021
$27.64
(0.06
)
6.06
6.00
(0.13
)
(0.13
)
Year Ended 12/31/2020
$22.59
(0.06
)
5.24
5.18
(0.13
)
(0.13
)
 
Notes to Financial Highlights
(a)
In addition to the fees and expenses that the Fund bears directly, the Fund indirectly bears a pro rata share of the fees and expenses of any other funds in which it invests. Such indirect expenses are not included in the Fund’s reported expense ratios.
(b)
Total net expenses include the impact of certain fee waivers/expense reimbursements made by the Investment Manager and certain of its affiliates, if applicable.
(c)
Ratios include line of credit interest expense which is less than 0.01%.
(d)
The benefits derived from expense reductions had an impact of less than 0.01%.
(e)
 Net investment income per share includes special dividends. The effect of these dividends amounted to $0.01 per share.
(f)
Ratios include Trustees’ fees deferred during the current period as well as any gains or losses on the Trustees’ deferred compensation balances as a result of market fluctuations. If these had been excluded, expenses would have been higher by 0.01%.
The accompanying Notes to Financial Statements are an integral part of this statement.
50
Columbia Acorn Trust  | 2025

Financial Highlights (continued)
Columbia Acorn European FundSM
 
 
Net
asset
value,
end of
period
Total
return
Total gross
expense
ratio to
average
net assets(a)
Total net
expense
ratio to
average
net assets(a),(b)
Net investment
income (loss)
ratio to
average
net assets
Portfolio
turnover
Net
assets,
end of
period
(000’s)
Class A
Six Months Ended 6/30/2025 (Unaudited)
$28.97
21.37%
1.79%
(c)
1.37%
(c)
2.58%
53%
$25,701
Year Ended 12/31/2024
$23.87
(4.39%
)
1.97%
(c)
1.45%
(c),(d)
0.08%
47%
$23,057
Year Ended 12/31/2023
$25.55
24.76%
1.92%
(c)
1.45%
(c),(d)
0.24%
23%
$30,487
Year Ended 12/31/2022
$20.61
(38.16%
)
1.80%
(c),(f)
1.45%
(c),(d),(f)
0.25%
31%
$28,892
Year Ended 12/31/2021
$33.33
21.47%
1.63%
(c)
1.44%
(c),(d)
(0.45%
)
21%
$66,374
Year Ended 12/31/2020
$27.49
22.80%
1.86%
(c)
1.45%
(c)
(0.54%
)
45%
$42,059
Institutional Class
Six Months Ended 6/30/2025 (Unaudited)
$29.25
21.57%
1.55%
(c)
1.13%
(c)
2.65%
53%
$15,466
Year Ended 12/31/2024
$24.06
(4.18%
)
1.72%
(c)
1.20%
(c),(d)
0.32%
47%
$18,053
Year Ended 12/31/2023
$25.76
25.09%
1.67%
(c)
1.20%
(c),(d)
0.47%
23%
$23,802
Year Ended 12/31/2022
$20.77
(38.02%
)
1.54%
(c),(f)
1.20%
(c),(d),(f)
0.46%
31%
$38,307
Year Ended 12/31/2021
$33.51
21.76%
1.38%
(c)
1.19%
(c),(d)
(0.21%
)
21%
$111,462
Year Ended 12/31/2020
$27.64
23.08%
1.61%
(c)
1.20%
(c)
(0.29%
)
45%
$55,171
The accompanying Notes to Financial Statements are an integral part of this statement.
Columbia Acorn Trust  | 2025
51

Notes to Financial Statements
June 30, 2025 (Unaudited)
Note 1. Organization
Columbia Acorn® Fund, Columbia Acorn International®, Columbia Acorn International SelectSM, Columbia Thermostat FundSM and Columbia Acorn European FundSM (each a Fund and collectively, the Funds) are each a series of Columbia Acorn Trust (the Trust). The Trust is registered under the Investment Company Act of 1940, as amended (the 1940 Act), as an open-end management investment company organized as a Massachusetts business trust. Each Fund is a diversified fund.
Columbia Thermostat FundSM is a “fund of funds”, investing significantly in affiliated funds managed by Columbia Management Investment Advisers, LLC (the Investment Manager or Columbia Management), a wholly-owned subsidiary of Ameriprise Financial, Inc. (Ameriprise Financial), or its affiliates (Underlying Funds). Columbia Thermostat FundSM is exposed to the same risks as the Underlying Funds in direct proportion to the allocation of its assets among the Underlying Funds. For information on the investment strategies, operations and risks of the Underlying Funds, please refer to the Fund’s current prospectus as well as the prospectuses and shareholder reports of the Underlying Funds, which are available from the Securities and Exchange Commission website at www.sec.gov or on the Underlying Funds’ website at columbiathreadneedleus.com/investor.
Fund shares
The Trust may issue an unlimited number of shares (without par value). The Funds currently offer the share classes listed in the Statement of Assets and Liabilities. Although all share classes generally have identical voting, dividend and liquidation rights, each share class votes separately when required by the Trust’s organizational documents or by law. Each share class has its own expense and sales charge structure. Different share classes may have different minimum initial investment amounts and pay different net investment income distribution amounts to the extent the expenses of distributing such share classes vary. Distributions to shareholders in a liquidation event will be proportional to the net asset value of each share class. 
As described in each Fund’s prospectus, Class A and Class C shares are available to the general public for investment. Class C shares automatically convert to Class A shares of the same Fund after 8 years. Institutional Class, Institutional 2 Class, Institutional 3 Class and Class S shares are available for purchase through authorized investment professionals to omnibus retirement plans and to certain other investors as also described in each Fund’s prospectus.
Note 2. Summary of significant accounting policies
Basis of preparation
Each Fund is an investment company that applies the accounting and reporting guidance in the Financial Accounting Standards Board (FASB) Accounting Standards Codification Topic 946, Financial Services - Investment Companies (ASC 946). The financial statements are prepared in accordance with U.S. generally accepted accounting principles (GAAP), which requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from those estimates.
The following is a summary of significant accounting policies followed by the Funds in the preparation of their financial statements.
Segment reporting
The intent of ASU 2023-07, Segment Reporting is to enable investors to better understand an entity’s overall performance and to assess its potential future cash flows through improved segment disclosures. Prior to July 7, 2025, the chief operating decision maker (CODM) was Columbia Wanger Asset Management, LLC (CWAM), a wholly-owned subsidiary of Columbia Management. Effective July 7, 2025, Columbia Management is the CODM. The CODM, through its Investment Oversight Committee and Global Executive Group, is responsible for assessing performance and making decisions about resource allocation. The CODM has determined that the Funds have a single operating segment because the CODM monitors the operating results of the Funds as a whole and the Funds’ long-term strategic asset allocation is pre-determined
52
Columbia Acorn Trust  | 2025

Notes to Financial Statements (continued)
June 30, 2025 (Unaudited)
in accordance with the terms of each Fund’s prospectus, based on a defined investment strategy which is executed by the Funds’ portfolio managers as a team. The financial information provided to and reviewed by the CODM is consistent with that presented within the Funds’ financial statements.
Security valuation
Equity securities listed on an exchange are valued at the closing price or last trade price on their primary exchange at the close of business of the New York Stock Exchange. Securities with a closing price not readily available or not listed on any exchange are valued at the mean between the closing bid and ask prices. Listed preferred stocks convertible into common stocks are valued using an evaluated price from a pricing service.
Foreign equity securities are valued based on the closing price or last trade price on their primary exchange at the close of business of the New York Stock Exchange. If any foreign equity security closing prices are not readily available, the securities are valued at the mean of the latest quoted bid and ask prices on such exchanges or markets. Foreign currency exchange rates are determined at the scheduled closing time of the New York Stock Exchange. Many securities markets and exchanges outside the U.S. close prior to the close of the New York Stock Exchange; therefore, the closing prices for securities in such markets or on such exchanges may not fully reflect events that occur after such close but before the close of the New York Stock Exchange. In those situations, foreign securities will be fair valued pursuant to a policy approved by the Board of Trustees. Under the policy, the Fund may utilize a third-party pricing service to determine these fair values. The third-party pricing service takes into account multiple factors, including relevant general and sector indices, currency fluctuations, depositary receipts, and futures, as applicable, to determine a good faith estimate that reasonably reflects the current market conditions as of the close of the New York Stock Exchange. The fair value of a security is likely to be different from the quoted or published price, if available.
Investments in open-end investment companies (other than exchange-traded funds (ETFs)), are valued at the latest net asset value reported by those companies as of the valuation time.
Investments in the Underlying Funds (other than exchange-traded funds (ETFs)), are valued at the latest net asset value reported by those companies as of the valuation time.
Investments for which market quotations are not readily available, or that have quotations which management believes are not reflective of market value or reliable, are valued at fair value as determined in good faith under procedures approved by the Board of Trustees. If a security or class of securities (such as foreign securities) is valued at fair value, such value is likely to be different from the quoted or published price for the security, if available.
The determination of fair value often requires significant judgment. To determine fair value, management may use assumptions including but not limited to future cash flows and estimated risk premiums. Multiple inputs from various sources may be used to determine fair value.
GAAP requires disclosure regarding the inputs and valuation techniques used to measure fair value and any changes in valuation inputs or techniques. In addition, investments shall be disclosed by major category. This information is disclosed following the Funds’ Portfolio of Investments.
Foreign currency transactions and translations
The values of all assets and liabilities denominated in foreign currencies are generally translated into U.S. dollars at exchange rates determined at the close of regular trading on the New York Stock Exchange. Net realized and unrealized gains (losses) on foreign currency transactions and translations include gains (losses) arising from the fluctuation in exchange rates between trade and settlement dates on securities transactions, gains (losses) arising from the disposition of foreign currency and currency gains (losses) between the accrual and payment dates on dividends, interest income and foreign withholding taxes.
For financial statement purposes, the Funds do not distinguish that portion of gains (losses) on investments which is due to changes in foreign exchange rates from that which is due to changes in market prices of the investments. Such fluctuations are included with the net realized and unrealized gains (losses) on investments in the Statement of Operations.
Columbia Acorn Trust  | 2025
53

Notes to Financial Statements (continued)
June 30, 2025 (Unaudited)
Security transactions
Security transactions are accounted for on the trade date. Cost is determined and gains (losses) are based upon the specific identification method for both financial statement and federal income tax purposes.
Income recognition
Corporate actions and dividend income are generally recorded net of any non-reclaimable tax withholdings, on the ex-dividend date or upon receipt of an ex-dividend notification in the case of certain foreign securities.
The Funds may receive distributions from holdings in exchange-traded funds (ETFs), limited partnerships (LPs), other regulated investment companies (RICs), and real estate investment trusts (REITs), which report information as to the character of their distributions annually. These distributions are allocated to dividend income, capital gain and return of capital based on actual information reported. To the extent actual information has not yet been reported by the REITs, estimates for return of capital may be made by the Funds’ management. Return of capital is recorded as a reduction of the cost basis of securities held. If the Funds no longer own the applicable securities, return of capital is recorded as a realized gain. Management’s estimates are subsequently adjusted when the actual character of the distributions is disclosed by the REITs, which could result in a proportionate change in return of capital to shareholders. No estimates are made for ETFs and RICs.
Awards from class action litigation are recorded as a reduction of cost basis if the Fund still owns the applicable securities on the payment date. If the Fund no longer owns the applicable securities on the payment date, the proceeds are recorded as realized gains.
Income and capital gain distributions from the Underlying Funds, if any, are recorded on the ex-dividend date.
Securities lending
Each Fund, except Columbia Thermostat FundSM, may lend securities up to one-third of the value of its total assets to certain approved brokers, dealers, banks and or other institutional borrowers of securities that the Funds’ securities lending agent has determined are credit worthy under guidelines established by the Board of Trustees, to earn additional income. The Funds retain the benefits of owning the securities, including the economic equivalent of dividends or interest generated by the security. The Funds also receive a fee for the loan. The Funds have the ability to recall the loans at any time and could do so in order to vote proxies or to sell the loaned securities. Each loan is collateralized by cash that exceeds the value of the securities on loan. The market value of the loaned securities is determined daily at the close of business of a Fund and any additional required collateral is delivered to the Fund on the next business day. The Funds have elected to invest the cash collateral in the Dreyfus Government Cash Management Fund, a third-party institutional government money market fund in accordance with investment guidelines contained in the securities lending agreement and approved by the Board of Trustees. The income earned from the securities lending program is paid to each Fund, net of any fees remitted to Goldman Sachs Agency Lending, the Funds’ lending agent, and net of any borrower rebates. The Investment Manager does not retain any fees earned by the lending program. Generally, in the event of borrower default, a Fund has the right to use the collateral to offset any losses incurred. In the event a Fund is delayed or prevented from exercising its right to dispose of the collateral, there may be a potential loss to the Fund. Some of these losses may be indemnified by the lending agent. The Funds bear the risk of loss with respect to the investment of collateral. The net securities lending income earned as of June 30, 2025 by each Fund is included in the Statement of Operations.
54
Columbia Acorn Trust  | 2025

Notes to Financial Statements (continued)
June 30, 2025 (Unaudited)
Offsetting of assets and liabilities
The following table presents the Fund’s gross and net amount of assets and liabilities available for offset under netting arrangements and under a securities lending agreement as well as any related collateral received or pledged by the Funds as of June 30, 2025: 
 
Columbia
Acorn® Fund
 
Goldman
Sachs ($)
Liabilities
Collateral on Securities Loaned
61,863,077
Total Liabilities
61,863,077
Total Financial and Derivative Net Assets
(61,863,077
)
Financial Instruments
60,428,091
Net Amount (a)
(1,434,986
)
 
(a)
Represents the net amount due from/(to) counterparties in the event of default.
Securities lending transactions
The following table indicates the total amount of securities loaned by type, reconciled to gross liability payable upon return of the securities loaned by the Funds as of June 30, 2025: 
 
Overnight and
continuous
Up to
30 days
30-90
days
Greater than
90 days
Total
Columbia Acorn® Fund
Securities lending transactions
Equity securities
$60,428,091
$—
$—
$—
$60,428,091
Gross amount of recognized liabilities for securities lending (collateral received)
61,863,077
Amounts due to counterparty in the event of default
$1,434,986
Expenses
General expenses of the Trust are allocated to the Funds and other funds of the Trust based upon relative net assets or other expense allocation methodologies determined by the nature of the expense. Expenses directly attributable to a Fund are charged to that Fund. Expenses directly attributable to a specific class of shares are charged to that share class.
Determination of class net asset value
All income, expenses (other than class-specific expenses which are charged directly to that share class, as shown in the Statement of Operations) and realized and unrealized gains (losses) are allocated to each class of a Fund on a daily basis, based on the relative net assets of each class, for purposes of determining the net asset value of each class.
Federal income tax status
For federal income tax purposes, each Fund is treated as a separate entity. The Funds intend to qualify each year as separate regulated investment companies under Subchapter M of the Internal Revenue Code, as amended, and will distribute substantially all of their investment company taxable income and net capital gain, if any, for their tax year, and as such will not be subject to federal income taxes. In addition, the Funds intend to distribute in each calendar year substantially all of their ordinary income, capital gain net income and certain other amounts, if any, such that the Funds should not be subject to federal excise tax. Therefore, no federal income or excise tax provisions are recorded.
Foreign taxes
The Funds may be subject to foreign taxes on income, gains on investments or currency repatriation, a portion of which may be recoverable. The Fund will accrue such taxes and recoveries, as applicable, based upon its current interpretation of tax rules and regulations that exist in the markets in which it invests.
Columbia Acorn Trust  | 2025
55

Notes to Financial Statements (continued)
June 30, 2025 (Unaudited)
Realized gains in certain countries may be subject to foreign taxes at the Fund level, based on statutory rates. The Fund accrues for such foreign taxes on realized and unrealized gains at the appropriate rate for each jurisdiction, as applicable. The amount, if any, is disclosed as a liability in the Statement of Assets and Liabilities.
The Fund may file withholding tax reclaims in certain European Union countries to recover a portion of foreign taxes previously withheld on dividends earned, which may be reclaimable based upon certain provisions in the Treaty on the Functioning of the European Union (EU) and subsequent rulings by the European Court of Justice. The Fund may record a reclaim receivable when the amount is known, the Fund has received notice of a pending refund, and there are no significant uncertainties on collectability. Income received from EU reclaims is included in the Statement of Operations.
Distributions to shareholders
Distributions from net investment income, if any, are declared and paid semi-annually. Net realized capital gains, if any, are distributed at least annually. Income distributions and capital gain distributions are determined in accordance with federal income tax regulations, which may differ from GAAP.
Guarantees and indemnifications
Under the Trust’s organizational documents and, in some cases, by contract, its officers and trustees are indemnified against certain liabilities arising out of the performance of their duties to the Trust or its funds. In addition, certain of the Funds’ contracts with their service providers contain general indemnification clauses. The Funds’ maximum exposure under these arrangements is unknown since the amount of any future claims that may be made against the Funds cannot be determined, and the Funds have no historical basis for predicting the likelihood of any such claims.
Recent accounting pronouncements and regulatory updates
Accounting Standards Update 2023-09 Income Taxes (Topic 740)
In December 2023, the FASB issued Accounting Standards Update No. 2023-09 Income Taxes (Topic 740) Improvements to Income Tax Disclosures. The amendments were issued to enhance the transparency and decision usefulness of income tax disclosures primarily related to rate reconciliation and income taxes paid information. The amendments are effective for annual periods beginning after December 15, 2024, with early adoption permitted. Management expects that the adoption of the amendments will not have a material impact on its financial statements.
Note 3. Fees and other transactions with affiliates 
Management services fees
Prior to July 7, 2025, CWAM was the Investment Manager and furnished investment supervision to the Funds and was responsible for the overall management of the Funds’ business affairs.
Prior to April 1, 2025, CWAM furnished investment advisory services to the Funds under an investment advisory agreement (the Advisory Agreement) and provided administrative services to the Funds under a separate administrative services agreement (the Administration Agreement). Effective April 1, 2025, the Funds entered into a new management services agreement (the Management Agreement) that combined the management services fee that was previously paid under the Advisory Agreement with the administrative services fee that was previously paid under the Administration Agreement. On June 26, 2025, the Funds’ Board of Trustees approved a Novation of Management Agreement pursuant to which all rights, duties and obligations under the Funds’ then-current Management Agreement with CWAM transferred to its parent company Columbia Management on July 7, 2025. Prior to July, 7, 2025, Columbia Management was the sub-administrator of the Funds and the investment adviser of each of the other Columbia funds except for each series of Columbia Funds Variable Series Trust (formerly Wanger Advisors Trust). The services provided to, and management fees paid by, the Funds did not change as a result of this transfer and the current portfolio managers of the Funds continued to manage the Funds after the transition.
56
Columbia Acorn Trust  | 2025

Notes to Financial Statements (continued)
June 30, 2025 (Unaudited)
For the period from January 1, 2025 through February 28, 2025, CWAM received an advisory fee based on each Fund’s daily net assets that declined as each Fund’s net assets increased at the following annual rates: 
 
High (%)
Low (%)
Annualized
effective advisory
fee rate (%)
Columbia Acorn® Fund
0.74
0.63
0.69
Columbia Acorn International®
1.10
0.72
0.86
Columbia Acorn International SelectSM
0.89
0.85
0.89
Columbia Thermostat FundSM
0.10
0.10
0.10
Columbia Acorn European FundSM
1.19
0.74
1.19
Effective March 1, 2025, the Board of Trustees approved a reduction in the advisory fee rates payable to CWAM by the Funds, as noted below. For the period March 1, 2025 through March 31, 2025 CWAM received an advisory fee based on each Fund’s daily net assets that declined as each Fund’s net assets increased at the following annual rates: 
 
High (%)
Low (%)
Annualized
effective advisory
fee rate (%)
Columbia Acorn® Fund
0.74
0.61
0.67
Columbia Acorn International®
0.87
0.70
0.81
Columbia Acorn International SelectSM
0.82
0.63
0.82
Columbia Thermostat FundSM
0.10
0.10
0.10
Columbia Acorn European FundSM
0.92
0.74
0.92
Advisory fees paid by the Funds for the period January 1, 2025 through March 31, 2025 are included in Management services fees on the Statement of Operations.
For the period April 1, 2025 through June 30, 2025, CWAM received a management services fee based on each Fund’s daily net assets that declined as each Fund’s net assets increased at the following annual rates: 
 
High (%)
Low (%)
Annualized effective
management services
fee rate (%)
Columbia Acorn® Fund
0.790
0.625
0.725
Columbia Acorn International®
0.920
0.715
0.864
Columbia Acorn International SelectSM
0.870
0.645
0.870
Columbia Thermostat FundSM
0.100
0.100
0.100
Columbia Acorn European FundSM
0.970
0.755
0.970
For the period January 1, 2025 through June 30, 2025, the effective blended advisory fee (for the period January 1, 2025 through March 31, 2025) and management services fee (for the period April 1, 2025 through June 30, 2025), as a percentage of each Fund’s average daily net assets, were as follows: 
 
Annualized
effective blended
fee rate (%)
Columbia Acorn® Fund
0.703
Columbia Acorn International®
0.853
Columbia Acorn International SelectSM
0.868
Columbia Thermostat FundSM
0.100
Columbia Acorn European FundSM
1.035
Columbia Acorn Trust  | 2025
57

Notes to Financial Statements (continued)
June 30, 2025 (Unaudited)
Participating Affiliates
The Investment Manager and its investment advisory affiliates (Participating Affiliates), may coordinate in providing services to their clients. These Participating Affiliates, like the Investment Manager, are direct or indirect subsidiaries of Ameriprise Financial and are registered with the appropriate respective regulators and, where required, the Securities and Exchange Commission and the Commodity Futures Trading Commission in the United States. The Investment Manager engages employees of Participating Affiliates to provide portfolio management services to the Funds. These employees provide services to the Investment Manager pursuant to personnel-sharing agreements or other inter-company arrangements and the Funds pay no additional fees and expenses as a result of any such arrangements.
Specifically, pursuant to such arrangements, employees of Participating Affiliates serve as “associated persons” of the Investment Manager and, in this capacity, serve as Fund portfolio managers and provide portfolio management services to the Funds on behalf of the Investment Manager subject to the oversight and supervision of the Investment Manager and the Funds’ Chief Compliance Officer, consistent with the investment objectives, policies and limitations set forth in each Fund’s prospectus and SAI, and the Investment Manager’s and the Funds’ compliance policies and procedures.
Administration fees
Prior to April 1, 2025, CWAM received an administration fee from the Funds at the following annual rates: 
Columbia Acorn Trust
Aggregate average daily
net assets of the trust
Annual
fee rate
Up to $8 billion
0.050%
$8 billion to $16 billion
0.040%
$16 billion to $35 billion
0.030%
$35 billion to $45 billion
0.025%
$45 billion and over
0.015%
For the period January 1, 2025 through March 31, 2025, the annualized effective administration fee rate was 0.050% of each Fund’s average daily net assets, with the exception of Columbia Thermostat FundSM. Columbia Thermostat FundSM contractually waived administration fees for the period March 1, 2025 through March 31, 2025. For the period January 1, 2025 through March 31, 2025, the annualized effective administration fee rate, including the impact of administration fee waivers, for Columbia Thermostat FundSM was 0.030% of the Fund’s average daily net assets.
Compensation of Board members 
Members of the Board of Trustees who are not officers or employees of the Investment Manager or Ameriprise Financial are compensated for their services to the Funds as disclosed in the Statement of Operations. Under a Deferred Compensation Plan (the Deferred Plan), these members of the Board of Trustees may elect to defer payment of up to 100% of their compensation. Deferred amounts are treated as though equivalent dollar amounts had been invested in shares of certain funds managed by the Investment Manager. Each Fund’s liability for these amounts is adjusted for market value changes and remains in the Funds until distributed in accordance with the Deferred Plan. All amounts payable under the Deferred Plan constitute a general unsecured obligation of the Funds. The expense for the Deferred Plan, which includes Trustees’ fees deferred during the current period as well as any gains or losses on the Trustees’ deferred compensation balances as a result of market fluctuations, is included in "Deferred compensation of board members" in the Statement of Operations.
Compensation of Chief Compliance Officer
The Board of Trustees has appointed a Chief Compliance Officer for the Funds in accordance with federal securities regulations. As disclosed in the Statement of Operations, a portion of the Chief Compliance Officer’s total compensation is allocated to the Funds, along with other allocations to affiliated registered investment companies managed by the Investment Manager and its affiliates, based on relative net assets.
58
Columbia Acorn Trust  | 2025

Notes to Financial Statements (continued)
June 30, 2025 (Unaudited)
Transfer agency fees
Under a Transfer and Dividend Disbursing Agent Agreement, Columbia Management Investment Services Corp. (the Transfer Agent), an affiliate of the Investment Manager and a wholly-owned subsidiary of Ameriprise Financial, is responsible for providing transfer agency services to the Funds. The Transfer Agent has contracted with SS&C GIDS, Inc. (SS&C GIDS) to serve as sub-transfer agent. The Transfer Agent pays the fees of SS&C GIDS for services as sub-transfer agent and SS&C GIDS is not entitled to reimbursement for such fees from the Funds (with the exception of out-of-pocket fees).
The Funds pay the Transfer Agent a monthly transfer agency fee based on the number or the average value of accounts, depending on the type of account. In addition, the Funds pay the Transfer Agent a fee for shareholder services based on the number of accounts or on a percentage of the average aggregate value of a Fund’s shares maintained in omnibus accounts up to the lesser of the amount charged by the financial intermediary or a cap established by the Board of Trustees from time to time.
The Transfer Agent also receives compensation from the Funds for various shareholder services and reimbursements for certain out-of-pocket fees. Total transfer agency fees for Institutional 2 Class and Institutional 3 Class shares are subject to an annual limitation of not more than 0.07% and 0.02%, respectively, of the average daily net assets attributable to each share class. Prior to April 30, 2025, Institutional 2 Class shares were subject to a contractual transfer agency fee annual limitation of not more than 0.05% and Institutional 3 Class shares were subject to a contractual transfer agency fee annual limitation of not more than 0.00% of the average daily net assets attributable to each share class for Columbia Acorn International SelectSM. In addition, prior to April 30, 2025, Institutional 2 Class shares were subject to a contractual transfer agency fee annual limitation of not more than 0.04% and Institutional 3 Class shares were subject to a contractual transfer agency fee annual limitation of not more than 0.00% of the average daily net assets attributable to each share class for Columbia Thermostat FundSM.
For the six months ended June 30, 2025, each Fund’s annualized effective transfer agency fee rate as a percentage of average daily net assets was as follows: 
Fund
Class A
(%)
Class C
(%)
Institutional
Class (%)
Institutional 2
Class (%)
Institutional 3
Class (%)
Class S
(%)
Columbia Acorn® Fund
0.09
0.08
0.09
0.05
0.01
0.09
Columbia Acorn International®
0.11
0.11
0.06
0.01
0.11
Columbia Acorn International SelectSM
0.20
0.20
0.05
0.00
0.20
Columbia Thermostat FundSM
0.09
0.09
0.09
0.05
0.00
0.09
Columbia Acorn European FundSM
0.13
0.13
An annual minimum account balance fee of $20 may apply to certain accounts with a value below the applicable share class’s initial minimum investment requirements to reduce the impact of small accounts on transfer agency fees. These minimum account balance fees are remitted to the Funds and recorded as part of expense reductions in the Statement of Operations. For the six months ended June 30, 2025, no minimum account balance fees were charged by the Funds.
Distribution and service fees
The Funds have entered into an agreement with Columbia Management Investment Distributors, Inc. (the Distributor), an affiliate of the Investment Manager and a wholly-owned subsidiary of Ameriprise Financial, for distribution and shareholder services. The Board of Trustees has approved, and the Funds have adopted, distribution and shareholder service plans (the Plans) applicable to certain share classes, which set the distribution and service fees for the Funds. These fees are calculated daily and are intended to compensate the Distributor and/or eligible selling and/or servicing agents for selling shares of the Funds and providing services to investors.
Under the Plans, the Funds pay a monthly service fee to the Distributor at the maximum annual rate of 0.25% of the average daily net assets attributable to Class A and Class C shares of the Funds. Also under the Plans, the Funds pay a monthly distribution fee to the Distributor at the maximum annual rate of 0.75% of the average daily net assets attributable to Class C shares of the Funds.
Columbia Acorn Trust  | 2025
59

Notes to Financial Statements (continued)
June 30, 2025 (Unaudited)
Sales charges
Sales charges, including front-end charges and contingent deferred sales charges (CDSCs), received by the Distributor for distributing Fund shares for the six months ended June 30, 2025, if any, are listed below: 
 
Front End (%)
CDSC (%)
Amount ($)
Fund
Class A
Class C
Class A
Class C
Class A
Class C
Columbia Acorn® Fund
5.75
0.50 - 1.00
(a)
1.00
(b)
22,679
361
Columbia Acorn International®
5.75
0.50 - 1.00
(a)
1.00
(b)
8,498
Columbia Acorn International SelectSM
5.75
0.50 - 1.00
(a)
7,768
Columbia Thermostat FundSM
5.75
0.50 - 1.00
(a)
1.00
(b)
70,717
2,184
Columbia Acorn European FundSM
5.75
0.50 - 1.00
(a)
4,244
 
(a)
This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.
(b)
This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.
The Funds’ other share classes are not subject to sales charges.
Expenses waived/reimbursed by the Investment Manager and its affiliates
The Investment Manager and certain of its affiliates have contractually agreed to waive fees and/or reimburse expenses (excluding certain fees and expenses described below) for the period(s) disclosed below, unless sooner terminated at the sole discretion of the Board of Trustees, so that each Fund’s net operating expenses, after giving effect to fees waived/expenses reimbursed and any balance credits and/or overdraft charges from the Funds’ custodian, do not exceed the following annual rate(s) as a percentage of the classes’ average daily net assets: 
 
March 1, 2025 through April 30, 2027
Fund
Class A
(%)
Class C
(%)
Institutional
Class (%)
Institutional 2
Class (%)
Institutional 3
Class (%)
Class S
(%)
Columbia Acorn® Fund
1.07
1.82
0.82
0.78
0.74
0.82
Columbia Acorn International®
1.22
N/A
0.97
0.89
0.84
0.97
Columbia Thermostat FundSM
0.50
1.25
0.25
0.20
0.16
0.25
 
 
Prior to March 1, 2025
Fund
Class A
(%)
Class C
(%)
Institutional
Class (%)
Institutional 2
Class (%)
Institutional 3
Class (%)
Class S
(%)
Columbia Acorn® Fund
1.08
1.83
0.83
0.80
0.75
0.83
Columbia Acorn International®
1.23
N/A
0.98
0.92
0.88
0.98
Columbia Thermostat FundSM
0.50
1.25
0.25
0.20
0.16
0.25
 
 
May 1, 2025 through April 30, 2026
Fund
Class A
(%)
Institutional
Class (%)
Institutional 2
Class (%)
Institutional 3
Class (%)
Class S
(%)
 
Columbia Acorn International SelectSM
1.11
0.86
0.72
0.67
0.86
Columbia Acorn European FundSM
1.31
1.06
N/A
N/A
N/A
 
 
March 1, 2025 through April 30, 2025
Fund
Class A
(%)
Institutional
Class (%)
Institutional 2
Class (%)
Institutional 3
Class (%)
Class S
(%)
 
Columbia Acorn International SelectSM
1.14
0.89
0.75
0.70
0.89
Columbia Acorn European FundSM
1.37
1.12
N/A
N/A
N/A
 
60
Columbia Acorn Trust  | 2025

Notes to Financial Statements (continued)
June 30, 2025 (Unaudited)
 
Prior to March 1, 2025
Fund
Class A
(%)
Institutional
Class (%)
Institutional 2
Class (%)
Institutional 3
Class (%)
Class S
(%)
 
Columbia Acorn International SelectSM
1.24
0.99
0.84
0.79
0.99
Columbia Acorn European FundSM
1.45
1.20
N/A
N/A
N/A
Under the agreement governing these fee waivers and/or expense reimbursement arrangements, the following fees and expenses are excluded from the waiver/reimbursement commitment, and therefore will be paid by each Fund, if applicable: taxes (including foreign transaction taxes), expenses associated with investments in affiliated and non-affiliated pooled investment vehicles (including mutual funds and exchange-traded funds), transaction costs and brokerage commissions, costs related to any securities lending program, dividend expenses associated with securities sold short, inverse floater program fees and expenses, transaction charges and interest on borrowed money, interest, costs associated with shareholder meetings, infrequent and/or unusual expenses and any other expenses the exclusion of which is specifically approved by the Board of Trustees. This agreement may be modified or amended only with approval from the Investment Manager, certain of its affiliates and the Fund. In addition to the contractual agreement, the Investment Manager and certain of its affiliates have voluntarily agreed to waive fees and/or reimburse Columbia Acorn International® expenses (excluding certain fees and expenses described above) so that Columbia Acorn International® level expenses (expenses directly attributable to Columbia Acorn International® and not to a specific share class) are waived proportionately across all share classes, but Columbia Acorn International® net operating expenses shall not exceed the contractual annual rates listed in the table above. This arrangement may be revised or discontinued at any time. Any fees waived and/or expenses reimbursed under the expense reimbursement arrangements described above are not recoverable by the Investment Manager or its affiliates in future periods. Reflected in the contractual cap commitment, prior to April 30, 2025, is the Transfer Agent’s contractual agreement to limit total transfer agency fees to an annual rate of not more than 0.05% for Institutional 2 Class and 0.00% for Institutional 3 of the average daily net assets attributable to each share class for Columbia Acorn International SelectSM. In addition, reflected in the contractual cap commitment, prior to April 30, 2025, is the Transfer Agent’s contractual agreement to limit total transfer agency fees to an annual rate of not more than 0.04% for Institutional 2 Class and 0.00% for Institutional 3 of the average daily net assets attributable to each share class for Columbia Thermostat FundSM.
Note 4. Federal tax information
The timing and character of income and capital gain distributions are determined in accordance with income tax regulations, which may differ from GAAP because of temporary or permanent book to tax differences.
At June 30, 2025, the approximate cost of all investments for federal income tax purposes and the aggregate gross approximate unrealized appreciation and depreciation based on that cost was: 
Fund
Tax cost ($)
Gross
unrealized
appreciation ($)
Gross
unrealized
(depreciation) ($)
Net unrealized
appreciation ($)
Columbia Acorn® Fund
2,196,261,000
491,599,000
(158,182,000
)
333,417,000
Columbia Acorn International®
629,502,000
317,559,000
(21,584,000
)
295,975,000
Columbia Acorn International SelectSM
162,143,000
50,963,000
(10,224,000
)
40,739,000
Columbia Thermostat FundSM
1,144,031,000
105,457,000
105,457,000
Columbia Acorn European FundSM
34,377,000
7,500,000
(1,275,000
)
6,225,000
Tax cost of investments and unrealized appreciation/(depreciation) may also include timing differences that do not constitute adjustments to tax basis.
The following capital loss carryforwards, determined at December 31, 2024, may be available to reduce future net realized gains on investments, if any, to the extent permitted by the Internal Revenue Code.  
Columbia Acorn Trust  | 2025
61

Notes to Financial Statements (continued)
June 30, 2025 (Unaudited)
Fund
No expiration
short-term ($)
No expiration
long-term ($)
Total ($)
Columbia Acorn® Fund
(180,977,174
)
(1,203,843
)
(182,181,017
)
Columbia Acorn International®
(46,612,186
)
(26,269,099
)
(72,881,285
)
Columbia Acorn International SelectSM
(9,143,290
)
(9,143,290
)
Columbia Thermostat FundSM
(116,858,166
)
(116,858,166
)
Columbia Acorn European FundSM
(5,586,840
)
(5,586,840
)
Under current tax rules, regulated investment companies can elect to treat certain late-year ordinary losses incurred and post-October capital losses (capital losses realized after October 31) as arising on the first day of the following taxable year. The Funds will elect to treat the following late-year ordinary losses and post-October capital losses at December 31, 2024 as arising on January 1, 2025. 
Fund
Late year
ordinary losses ($)
Post-October
capital losses ($)
Columbia Acorn European FundSM
40,144
Management of the Funds has concluded that there are no significant uncertain tax positions in the Funds that would require recognition in the financial statements. However, management’s conclusion may be subject to review and adjustment at a later date based on factors including, but not limited to, new tax laws, regulations, and administrative interpretations (including relevant court decisions). Generally, the Funds’ federal tax returns for the prior three fiscal years remain subject to examination by the Internal Revenue Service.
Note 5. Portfolio information
For the six months ended June 30, 2025, the cost of purchases and proceeds from sales of securities, excluding short-term investments and derivatives, if any, for each Fund aggregated to: 
 
Purchases
($)
Proceeds
from sales
($)
Columbia Acorn® Fund
1,061,238,667
1,215,271,847
Columbia Acorn International®
75,193,764
171,311,319
Columbia Acorn International SelectSM
17,006,159
26,247,657
Columbia Thermostat FundSM
720,351,481
741,703,078
Columbia Acorn European FundSM
21,025,980
28,981,712
The amount of purchase and sale activity impacts the portfolio turnover rate reported in the Financial Highlights.
Note 6. Affiliated money market fund 
Each Fund may invest in Columbia Short-Term Cash Fund, an affiliated money market fund established for the exclusive use by each Fund and other affiliated funds (the Affiliated MMF). The income earned by the Funds from such investments is included as Dividends - affiliated issuers in the Statement of Operations. As an investing fund, each Fund indirectly bears its proportionate share of the expenses of the Affiliated MMF. The Affiliated MMF prices its shares with a floating net asset value. The Securities and Exchange Commission has adopted amendments to money market fund rules requiring institutional prime money market funds like the Affiliated MMF to be subject to a discretionary liquidity fee of up to 2% if the imposition of such a fee is determined to be in the best interest of the Affiliated MMF and to a mandatory liquidity fee if daily net redemptions exceed 5% of net assets.
Note 7. Line of credit
Each Fund has access to a revolving credit facility with a syndicate of banks led by JPMorgan Chase Bank, N.A., Citibank, N.A. and Wells Fargo Bank, N.A. whereby the Fund may borrow for the temporary funding of shareholder redemptions or for other temporary or emergency purposes. Pursuant to an October 24, 2024 amendment and restatement, the credit facility, which is an agreement between the Fund and certain other funds managed by the Investment Manager or an affiliated
62
Columbia Acorn Trust  | 2025

Notes to Financial Statements (continued)
June 30, 2025 (Unaudited)
investment manager, severally and not jointly, permits aggregate borrowings up to $900 million. Interest is currently charged to each participating fund based on its borrowings at a rate equal to the higher of (i) the federal funds effective rate, (ii) the secured overnight financing rate plus 0.10% and (iii) the overnight bank funding rate, plus 1.00% in each case. Each borrowing under the credit facility matures no later than 60 days after the date of borrowing. The Fund also pays a commitment fee equal to its pro rata share of the unused amount of the credit facility at a rate of 0.15% per annum. The commitment fee is included in other expenses in the Statement of Operations. This agreement expires annually in October unless extended or renewed. Prior to the October 24, 2024 amendment and restatement, each Fund had access to a revolving credit facility with a syndicate of banks led by JPMorgan Chase Bank, N.A., Citibank, N.A. and Wells Fargo Bank, N.A. which permitted collective borrowings up to $900 million. Interest was charged to each participating fund based on its borrowings at a rate equal to the higher of (i) the federal funds effective rate, (ii) the secured overnight financing rate plus 0.10% and (iii) the overnight bank funding rate, plus 1.00% in each case.
During the six months ended June 30, 2025, the following Funds had borrowings: 
Fund
Average loan
balance ($)
Weighted average
interest rate (%)
Days
outstanding
Columbia Acorn International®
4,680,000
5.41
5
Columbia Acorn International SelectSM
200,000
5.38
2
Columbia Thermostat FundSM
900,000
5.39
4
Columbia Acorn European FundSM
200,000
5.44
3
Interest expense incurred by the Funds is recorded as Line of credit interest in the Statement of Operations. Columbia Acorn International®, Columbia Acorn International SelectSM , Columbia Thermostat FundSM  and Columbia Acorn European FundSM had no outstanding borrowings at June 30, 2025.
Note 8. Significant risks
Financials sector risk 
Columbia Acorn European FundSM is more susceptible to the particular risks that may affect companies in the financials sector than if they were invested in a wider variety of companies in unrelated sectors. Companies in the financials sector are subject to certain risks, including the risk of regulatory change, decreased liquidity in credit markets and unstable interest rates. Such companies may have concentrated portfolios, such as a high level of loans to real estate developers, which makes them vulnerable to economic conditions that affect that industry. Performance of such companies may be affected by competitive pressures and exposure to investments, agreements and counterparties, including credit products that, under certain circumstances, may lead to losses (e.g., subprime loans). Companies in the financials sector are subject to extensive governmental regulation that may limit the amount and types of loans and other financial commitments they can make, and interest rates and fees that they may charge. In addition, profitability of such companies is largely dependent upon the availability and the cost of capital.
Foreign securities and emerging market countries risk
Investing in foreign securities may involve heightened risks relative to investments in U.S. securities. Investing in foreign securities subjects the Funds to the risks associated with the issuer’s country of organization and places of business operations, including risks associated with political, regulatory, economic, social, diplomatic and other conditions or events occurring in the country or region, which may result in significant market volatility. In addition, certain foreign securities may be more volatile and less liquid than U.S. securities. Investing in emerging markets may increase these risks and expose the Funds to elevated risks associated with increased inflation, deflation or currency devaluation. To the extent that Columbia Acorn International®, Columbia Acorn International SelectSM and Columbia Acorn European FundSM concentrate their investment exposure to any one or a few specific countries, the Funds will be particularly susceptible to the risks associated with the conditions, events or other factors impacting those countries or regions and may, therefore, have a greater risk than that of a fund that is more geographically diversified. The financial information and disclosure made available by issuers of emerging market securities may be considerably less reliable than publicly available information about other foreign securities. The Public Company Accounting Oversight Board, which regulates auditors of U.S. public companies, is unable to inspect audit work papers in certain foreign countries. Investors in foreign countries often have limited rights and few practical remedies to pursue shareholder claims, including class actions or fraud claims, and the ability of the U.S. Securities
Columbia Acorn Trust  | 2025
63

Notes to Financial Statements (continued)
June 30, 2025 (Unaudited)
and Exchange Commission, the U.S. Department of Justice and other authorities to bring and enforce actions against foreign issuers or foreign persons is limited.
Geographic focus risk
Columbia Acorn International®, Columbia Acorn International SelectSM and Columbia Acorn European FundSM may be particularly susceptible to risks related to economic, political, regulatory or other events or conditions affecting issuers and countries within the specific geographic regions in which the Funds invest. The Funds’ net asset value may be more volatile than the net asset value of a more geographically diversified fund.
Asia Pacific Region. Columbia Acorn International®and Columbia Acorn International SelectSM are particularly susceptible to economic, political, regulatory or other events or conditions affecting issuers and countries in the Asia Pacific region. Many of the countries in the region are considered underdeveloped or developing, including from a political, economic and/or social perspective, and may have relatively unstable governments and economies based on limited business, industries and/or natural resources or commodities. Events in any one country within the region may impact other countries in the region or the region as a whole. As a result, events in the region will generally have a greater effect on the Funds than if the Funds were more geographically diversified. This could result in increased volatility in the value of the Funds’ investments and losses for the Funds. Also, securities of some companies in the region can be less liquid than U.S. or other foreign securities, potentially making it difficult for the Funds to sell such securities at a desirable time and price.
Europe. Columbia Acorn International®, Columbia Acorn International SelectSM and Columbia Acorn European FundSM are particularly susceptible to risks related to economic, political, regulatory or other events or conditions, including acts of war or other conflicts in the region, affecting issuers and countries in Europe. Countries in Europe are often closely connected and interdependent, and events in one European country can have an adverse impact on, and potentially spread to, other European countries. In addition, significant private or public debt problems in a single European Union (EU) country can pose economic risks to the EU as a whole. As a result, the Funds’ net asset value may be more volatile than the net asset value of a more geographically diversified fund. If securities of issuers in Europe fall out of favor, it may cause the Funds to underperform other funds that do not focus their investments in this region of the world. Uncertainty caused by the departure of the United Kingdom (UK) from the EU, which occurred in January 2020, could have negative impacts on the UK and EU, as well as other European economies and the broader global economy. These could include negative impacts on currencies and financial markets as well as increased volatility and illiquidity, and potentially lower economic growth in markets in Europe, which could adversely affect the value of your investment in the Fund.
Japan. Columbia Acorn International® and Columbia Acorn International SelectSM are particularly susceptible to the social, political, economic, regulatory and other conditions or events that may affect Japan’s economy. The Japanese economy is heavily dependent upon international trade, including, among other things, the export of finished goods and the import of oil and other commodities and raw materials.  Because of its trade dependence, the Japanese economy is particularly exposed to the risks of currency fluctuation, foreign trade policy and regional and global economic disruption, including the risk of increased tariffs, embargoes, and other trade limitations or factors. Strained relationships between Japan and its neighboring countries, including China, South Korea and North Korea, based on historical grievances, territorial disputes, and defense concerns, may also cause uncertainty in Japanese markets. As a result, additional tariffs, other trade barriers, or boycotts may have an adverse impact on the Japanese economy. Japanese government policy has been characterized by economic regulation, intervention, protectionism and large government deficits. The Japanese economy is also challenged by an unstable financials sector, highly leveraged corporate balance sheets and extensive cross-ownership among major corporations. Structural social and labor market changes, including an aging workforce, population decline and traditional aversion to labor mobility may adversely affect Japan’s economic competitiveness and growth potential. The potential for natural disasters, such as earthquakes, volcanic eruptions, typhoons and tsunamis, could also have significant negative effects on Japan’s economy. As a result of the Fund’s investment in Japanese securities, the Fund’s net asset value may be more volatile than the net asset value of a more geographically diversified fund. If securities of issuers in Japan fall out of favor, it may cause the Funds to underperform other funds that do not focus their investments in Japan.
64
Columbia Acorn Trust  | 2025

Notes to Financial Statements (continued)
June 30, 2025 (Unaudited)
Health care sector risk
Columbia Acorn® Fund is more susceptible to the particular risks that may affect companies in the health care sector than if it were invested in a wider variety of companies in unrelated sectors. Companies in the health care sector are subject to certain risks, including restrictions on government reimbursement for medical expenses, government approval of medical products and services, competitive pricing pressures, and the rising cost of medical products and services (especially for companies dependent upon a relatively limited number of products or services). Performance of such companies may be affected by factors including government regulation, obtaining and protecting patents (or the failure to do so), product liability and other similar litigation as well as product obsolescence.
Industrial sector risk  
Columbia Acorn® Fund, Columbia Acorn International®, Columbia Acorn International SelectSM and Columbia Acorn European FundSM are more susceptible to the particular risks that may affect companies in the industrials sector than if they were invested in a wider variety of companies in unrelated sectors. Companies in the industrials sector are subject to certain risks, including changes in supply and demand for their specific product or service and for industrial sector products in general, including decline in demand for such products due to rapid technological developments and frequent new product introduction. Performance of such companies may be affected by factors including government regulation, world events, economic conditions and risks for environmental damage and product liability claims.
Information technology sector risk  
Columbia Acorn International® is more susceptible to the particular risks that may affect companies in the information technology sector than if it were invested in a wider variety of companies in unrelated sectors. Companies in the information technology sector are subject to certain risks, including the risk that new services, equipment or technologies will not be accepted by consumers and businesses or will become rapidly obsolete. Performance of such companies may be affected by factors including obtaining and protecting patents (or the failure to do so) and significant competitive pressures, including aggressive pricing of their products or services, new market entrants, competition for market share and short product cycles due to an accelerated rate of technological developments. Such competitive pressures may lead to limited earnings and/or falling profit margins. As a result, the value of their securities may fall or fail to rise. In addition, many information technology sector companies have limited operating histories and prices of these companies’ securities historically have been more volatile than other securities, especially over the short term. Some companies in the information technology sector are facing increased government and regulatory scrutiny and may be subject to adverse government or regulatory action, which could negatively impact the value of their securities.
Market risk
The Funds may incur losses due to declines in the value of one or more securities in which they invest. These declines may be due to factors affecting a particular issuer, or the result of, among other things, political, regulatory, market, economic or social developments affecting the relevant market(s) more generally. In addition, turbulence in financial markets and reduced liquidity in equity, credit and/or fixed income markets may negatively affect many issuers, which could adversely affect the Funds’ ability to price or value hard-to-value assets in thinly traded and closed markets and could cause significant redemptions and operational challenges. Global economies and financial markets are increasingly interconnected, and conditions and events in one country, region or financial market may adversely impact issuers in a different country, region or financial market. These risks may be magnified if certain events or developments adversely interrupt the global supply chain; in these and other circumstances, such risks might affect companies worldwide. As a result, local, regional or global events such as terrorism, war, other conflicts, natural disasters, disease/virus outbreaks and epidemics or other public health issues, recessions, depressions or other events – or the potential for such events – could have a significant negative impact on global economic and market conditions.
Shareholder concentration risk
At June 30, 2025, certain shareholder accounts owned more than 20% of the outstanding shares of one or more of the Funds. For unaffiliated shareholder accounts, the Funds have no knowledge about whether any portion of those shares were owned beneficially. Fund shares sold to or redeemed by these accounts may have a significant effect on the operations of the Funds. In the case of a large redemption, the Fund may be forced to sell investments at inopportune times, including its
Columbia Acorn Trust  | 2025
65

Notes to Financial Statements (continued)
June 30, 2025 (Unaudited)
liquid positions, which may result in Fund losses and the Fund holding a higher percentage of less liquid positions. Large redemptions could result in decreased economies of scale and increased operating expenses for non-redeeming Fund shareholders.
The number of accounts and aggregate percentages of shares outstanding held therein were as follows: 
Fund
Percentage of
shares
outstanding
held —
affiliated (%)
Columbia Acorn® Fund
Columbia Acorn International®
Columbia Acorn International SelectSM
26.0
Columbia Thermostat FundSM
22.9
Columbia Acorn European FundSM
32.4
Small- and mid-cap company risk
Columbia Acorn® Fund, Columbia Acorn International®, Columbia Acorn International SelectSM and Columbia Acorn European FundSM investments in small- and mid-capitalization companies (small- and mid-cap companies) often involve greater risks than investments in larger, more established companies (larger companies) because small- and mid-cap companies tend to have less predictable earnings and may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. Securities of small- and mid-cap companies may be less liquid and more volatile than the securities of larger companies.
Note 9. Subsequent events
Management has evaluated the events and transactions that have occurred through the date the financial statements were issued. Other than as noted in Note 2 and Note 3 above, there were no items requiring adjustment of the financial statements or additional disclosure.
Note 10. Information regarding pending and settled legal proceedings
Ameriprise Financial and certain of its affiliates are involved, in the normal course of business, in legal proceedings that include regulatory inquiries, arbitration and litigation (including class actions) concerning matters arising in connection with the conduct of their activities as part of a diversified financial services firm. Ameriprise Financial believes that the Funds are not currently the subject of, and that neither Ameriprise Financial nor any of its affiliates are the subject of, any pending legal, arbitration or regulatory proceedings that are likely to have a material adverse effect on the Funds or the ability of Ameriprise Financial or its affiliates to perform under their contracts with the Funds. Ameriprise Financial is required to make quarterly (10-Q), annual (10-K) and, as necessary, 8-K filings with the Securities and Exchange Commission (SEC) on legal and regulatory matters that relate to Ameriprise Financial and its affiliates. Copies of these filings may be obtained by accessing the SEC website at www.sec.gov.
There can be no assurance that these matters, or the adverse publicity associated with them, will not result in increased Fund redemptions, reduced sale of Fund shares or other adverse consequences to the Funds. Further, although we believe proceedings are not likely to have a material adverse effect on the Funds or the ability of Ameriprise Financial or its affiliates to perform under their contracts with the Funds, these proceedings are subject to uncertainties and, as such, it is inherently difficult to determine whether any loss is probable or even reasonably possible, or to reasonably estimate the amount of any loss that may result from such matters. An adverse outcome in one or more of these proceedings could result in adverse judgments, settlements, fines, penalties or other relief, and may lead to further claims, examinations, adverse publicity or reputational damage, each of which could have a material adverse effect on the consolidated financial condition or results of operations or financial condition of Ameriprise Financial or one or more of its affiliates that provide services to the Funds.
66
Columbia Acorn Trust  | 2025

Results of Meeting of Shareholders
(Unaudited)
At a Joint Special Meeting of Shareholders held on February 26, 2025, shareholders of Columbia Acorn Trust elected each of the fifteen nominees for trustee to the Board of Trustees of Columbia Acorn Trust, each to hold office until he or she dies, retires, resigns or is removed or, if sooner, until the election and qualification of his or her successor, as follows: 
Trustee
Votes for
Votes withheld
Abstentions
George S. Batejan
205,615,145
14,931,583
0
Daniel J. Beckman
203,656,312
16,890,417
0
Kathleen Blatz
205,888,392
14,658,336
0
Pamela G. Carlton
205,814,242
14,732,486
0
Janet Langford Carrig
205,925,510
14,621,219
0
J. Kevin Connaughton
206,197,272
14,349,457
0
Olive M. Darragh
206,757,668
13,789,060
0
Patricia M. Flynn
205,709,045
14,837,684
0
Brian J. Gallagher
205,784,907
14,761,821
0
Douglas A. Hacker
204,217,674
16,329,055
0
Nancy T. Lukitsh
203,953,914
16,592,814
0
David M. Moffett
201,809,833
18,736,895
0
Catherine James Paglia
203,734,401
16,812,327
0
Natalie A. Trunow
204,536,248
16,010,480
0
Sandra L. Yeager
204,737,943
15,808,786
0
Columbia Acorn Trust  | 2025
67

Approval of Management Agreement
(Unaudited)
APPROVAL OF MANAGEMENT AGREEMENTS WITH COLUMBIA WANGER ASSET MANAGEMENT
Consideration of Management Agreement with Columbia Wanger Asset Management, LLC

At their meeting on March 27, 2025 (the March Meeting), the Board of Trustees (the Board), including the independent Board members (the Independent Trustees), of Columbia Acorn Trust (the Trust) unanimously approved management agreements (the CWAM Management Agreements) between Columbia Wanger Asset Management, LLC (CWAM) and the Trust, on behalf of Columbia Acorn Fund, Columbia Acorn European Fund, Columbia Acorn International, Columbia Acorn International Select, and Columbia Thermostat Fund (the Funds), effective April 1, 2025.  Independent legal counsel noted for the Independent Trustees that management was seeking approval of the proposed Management Agreements in place of existing Investment Advisory Agreements and Administrative Services Agreements with CWAM.
At the March Meeting, the Independent Trustees reviewed and discussed the presentation made at the March 26, 2025 Contracts Committee meeting regarding the proposed CWAM Management Agreements. The Independent Trustees considered the differences between each of the CWAM Management Agreements and the existing Investment Advisory Agreements and Administrative Services Agreements with CWAM.  The Independent Trustees considered that CWAM had confirmed that the nature and level of the services to be provided under the CWAM Management Agreements would not decrease relative to the services provided under the Investment Advisory Agreements and the Administrative Services Agreements.  The Independent Trustees also considered that the aggregate fee to be paid by the Funds would not change, noting that, for each Fund, the management fee rate was proposed to equal the sum of the existing investment management services fee rate and the existing administrative fee rate.  It was observed that the combining of the agreements was therefore not material for the Funds’ shareholders.  The Independent Trustees considered that the Funds’ investment management services and administrative fees were considered less than one year ago in connection with the June 2024 renewal of the existing Investment Advisory Agreements and Administrative Services Agreements with CWAM.
The Independent Trustees noted the discussion relating to the renewal and approval of the advisory agreements for the other Funds at the Contracts Committee and Board meetings in June 2024 (the June 2024 Meeting) and, in that connection, the discussion by independent legal counsel of the Board’s responsibilities pursuant to Sections 15(c) and 36(b) of the 1940 Act and the factors that should be considered in determining whether to approve or renew an investment management agreement and/or subadvisory agreement.  Independent legal counsel further indicated that the Independent Trustees should take into account the variety of written materials and oral presentations they received at this meeting as well as all of the information previously considered at the June 2024 Meeting regarding the proposed renewal of the other Funds’ advisory agreements.  It was noted that the Board’s consideration of the 2025 renewal of the Funds’ agreements would be undertaken in June 2025.
The Board reviewed all of the above considerations in reaching its decision to approve each of the
CWAM Management Agreements. In reaching its conclusions, no single factor was determinative.  On March 27, 2025, the Board, including all of the Independent Trustees, unanimously approved each of the CWAM Management Agreements.
APPROVAL OF MANAGEMENT AGREEMENTS WITH COLUMBIA MANAGEMENT INVESTMENT ADVISERS
At their meeting on June 26, 2025 (the June Meeting), the Board, including the Independent Trustees, unanimously approved novation agreements assigning the CWAM Management Agreements from CWAM to Columbia Management Investment Advisers, LLC (the Investment Manager, and together with its domestic and global affiliates, Columbia Threadneedle Investments), a wholly-owned subsidiary of Ameriprise Financial, Inc. (Ameriprise Financial), effective July 1, 2025.  The Board, including the Independent Trustees, also unanimously approved the continuation through June 30, 2026 of each of the management agreements (the Management Agreements) resulting therefrom.  Under the Management Agreements and other similar management agreements, the Investment Manager provides investment advice and other services to the Funds and other funds distributed by Columbia Management Investment Distributors, Inc. (collectively, the Columbia Funds).
On an annual basis, the Board, including the Independent Trustees, considers renewal of the Columbia Funds’ management agreements.  The Investment Manager prepared detailed reports for the Board and its Contracts Committee (including its Contracts Subcommittee) in March, April and June 2025, including reports providing the results of analyses performed by a third-party data provider, Broadridge Financial Solutions, Inc. (Broadridge), and comprehensive responses by the Investment
68
Columbia Acorn Trust  | 2025

Approval of Management Agreement (continued)
(Unaudited)
Manager to written requests for information by independent legal counsel to the Independent Trustees (Independent Legal Counsel), to assist the Board in making this determination.  In addition, throughout the year, the Board (or its committees or subcommittees) regularly meets with portfolio management teams and senior management personnel and reviews information prepared by the Investment Manager addressing the services the Investment Manager provides and Fund performance.  The Board also accords appropriate weight to the work, deliberations and conclusions of the various committees (including their subcommittees), such as the Contracts Committee, the Investment Review Committee, the Audit Committee and the Compliance Committee in determining whether to continue the Management Agreements. The Board also evaluated materials provided by CWAM regarding the Funds, and discussed these materials with representatives of the Investment Manager at the Committee and Board meetings held in March and June 2025.
The Board, at the June Meeting, considered the continuation of each Management Agreement through June 30, 2026.  At the June Meeting, Independent Legal Counsel reviewed with the Independent Trustees various factors relevant to the Board’s consideration of advisory agreements and the Board’s legal responsibilities related to such consideration.  The Independent Trustees considered such information as they, their legal counsel or the Investment Manager believed reasonably necessary to evaluate and to approve the continuation of each of the Management Agreements.  Among other things, the information and factors considered included the following:

Information on the investment performance of the Funds relative to the performance of a group of mutual funds determined to be comparable to the Funds by Broadridge, as well as performance relative to one or more benchmarks;

Information on the Funds’ management fees and total expenses, including information comparing the Funds’ expenses to those of a group of comparable mutual funds, as determined by Broadridge;

The Investment Manager’s agreement to contractually limit or cap total operating expenses for the Funds so that total operating expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses and infrequent and/or unusual expenses) would not exceed a specified annual rate, as a percentage of the Funds’ net assets;

Terms of the Management Agreements, including the novation agreements (also considered at this meeting);

Descriptions of other agreements and arrangements with affiliates of the Investment Manager relating to the operations of the Funds, including agreements with respect to the provision of transfer agency and shareholder services to the Funds;

Descriptions of various services performed by the Investment Manager under the Management Agreements, including portfolio management and portfolio trading practices;

Information regarding any recently negotiated management fees of similarly-managed portfolios of other institutional clients of the Investment Manager;

Information regarding the resources of the Investment Manager, including information regarding senior management, portfolio managers and other personnel;

Information regarding the capabilities of the Investment Manager with respect to compliance monitoring services;

The profitability to the Investment Manager and its affiliates from their relationships with the Funds; and

Report provided by the Board’s independent fee consultant, JDL Consultants, LLC (JDL).
Following an analysis and discussion of the foregoing, and the factors identified below, the Board, including all of the Independent Trustees, approved the continuation of each of the Management Agreements.
Nature, extent and quality of services provided by the Investment Manager

The Board analyzed various reports and presentations it had received detailing the services performed by the Investment Manager, as well as its history, expertise, resources and relative capabilities, and the qualifications of its personnel.
Columbia Acorn Trust  | 2025
69

Approval of Management Agreement (continued)
(Unaudited)
The Board specifically considered the many developments during recent years concerning the services provided by the Investment Manager. Among other things, the Board noted the organization and depth of the equity and credit research departments. The Board further observed the enhancements to the investment risk management department’s processes, systems and oversight over the past several years.  The Board also took into account the broad scope of services provided by the Investment Manager to the Funds, including, among other services, investment, risk and compliance oversight.  The Board also took into account the information it received concerning the Investment Manager’s ability to attract and retain key portfolio management personnel and that it has sufficient resources to provide competitive and adequate compensation to investment personnel.
In connection with the Board’s evaluation of the overall package of services provided by the Investment Manager, the Board also considered the nature, quality and range of administrative services provided to the Funds by the Investment Manager, as well as the achievements in 2024 in the performance of administrative services, and noted the various enhancements anticipated for 2025.  In evaluating the quality of services provided under the Management Agreements, the Board also took into account the organization and strength of the Funds’ and their service providers’ compliance programs.  The Board also reviewed the financial condition of the Investment Manager and its affiliates and each entity’s ability to carry out its responsibilities under the Management Agreements and the Funds’ other service agreements.
In addition, the Board discussed the acceptability of the terms of the Management Agreements, including the novation agreements (which were not expected to impact the services provided in any material respect).  The Board also noted the wide array of legal and compliance services provided to the Funds under the Management Agreements.
After reviewing these and related factors (including investment performance as discussed below), the Board concluded, within the context of their overall conclusions, that the nature, extent and quality of the services provided to the Funds under the Management Agreements supported the continuation of each of the Management Agreements.
Investment performance

The Board carefully reviewed the investment performance of the Funds, including detailed reports providing the results of analyses performed by each of the Investment Manager, Broadridge and JDL collectively showing, for various periods (including since manager inception): (i) the performance of the Funds, (ii) the Funds’ performance relative to peers and benchmarks and (iii) the net assets of the Funds. With respect to Columbia Acorn European Fund, Columbia Acorn International, and Columbia Acorn International Select, the Board observed the Funds’ underperformance for certain periods, noting that appropriate steps (such as enhancements to the Funds’ investment process and changes to the management teams) had been taken in recent years. With respect to Columbia Acorn Fund, the Board observed that the Fund’s performance for certain periods ranked above median based on information provided by Broadridge. With respect to Columbia Thermostat Fund, the Board observed that the Fund’s performance was well within the range of that of its peers.
The Board also reviewed a description of the third-party data provider’s methodology for identifying the Funds’ peer groups for purposes of performance and expense comparisons.
The Board also considered the Investment Manager’s performance and reputation generally. After reviewing these and related factors, the Board concluded, within the context of their overall conclusions, that the performance of the Funds and the Investment Manager, in light of other considerations, supported the continuation of each of the Management Agreements.
Comparative fees, costs of services provided and the profits realized by the Investment Manager and its affiliates from their relationships with the Funds

The Board reviewed comparative fees and the costs of services provided under the Management Agreements.  The Board members considered detailed comparative information set forth in an annual report on fees and expenses, including, among other things, data (based on analyses conducted by Broadridge and JDL) showing a comparison of the Funds’ expenses with median expenses paid by funds in its comparative peer universe, as well as data showing the Funds’ contribution to the Investment Manager’s profitability. With respect to Columbia Acorn Fund, the Board reviewed the fees charged to comparable institutional or other accounts/vehicles managed by the Investment Manager and discussed differences in how the products are managed and operated, thus explaining many of the differences in fees.
70
Columbia Acorn Trust  | 2025

Approval of Management Agreement (continued)
(Unaudited)
The Board considered the reports of JDL, which assisted in the Board’s analysis of the Funds’ performance and expenses and the reasonableness of the Funds’ fee rates.  With respect to each of Columbia Acorn European Fund and Columbia Acorn International Select, the Board took into account that the Fund’s total expense ratio (after considering proposed expense caps/waivers) approximated the peer universe’s median expense ratio. With respect to each of Columbia Acorn Fund, Columbia Acorn International, and Columbia Thermostat Fund, the Board took into account that the Fund’s total expense ratio (after considering proposed expense caps/waivers) was below the peer universe’s median expense ratio shown in the reports.
After reviewing these and related factors, the Board concluded, within the context of their overall conclusions, that the levels of management fees and expenses of the Funds, in light of other considerations, supported the continuation of each of the Management Agreements.
The Board also considered the profitability of the Investment Manager and its affiliates in connection with the Investment Manager providing management services to the Funds.  With respect to the profitability of the Investment Manager and its affiliates, the Independent Trustees referred to information discussing the profitability to the Investment Manager and Ameriprise Financial from managing, operating and distributing the Columbia Funds.  The Board considered that the profitability generated by the Investment Manager in 2024 had increased from 2023 levels due to a variety of factors, including the increased assets under management of the Columbia Funds.  It also took into account the indirect economic benefits flowing to the Investment Manager or its affiliates in connection with managing or distributing the Columbia Funds, such as the enhanced ability to offer various other financial products to Ameriprise Financial customers, soft dollar benefits and overall reputational advantages.  The Board noted that the fees paid by the Funds should permit the Investment Manager to offer competitive compensation to its personnel, make necessary investments in its business and earn an appropriate profit.  After reviewing these and related factors, the Board concluded, within the context of their overall conclusions, that the costs of services provided and the profitability to the Investment Manager and its affiliates from their relationships with the Funds supported the continuation of each of the Management Agreements.
The Board considered the economies of scale that might be realized as Columbia Thermostat Fund’s net asset level grows and took note of the extent to which Fund shareholders might also benefit from such growth. The Board took into account, however, that the Management Agreement for Columbia Thermostat Fund already provides for a relatively low flat fee regardless of the Fund’s asset level, and requires Columbia Threadneedle to provide investment advice, as well as administrative, accounting and other services to the Fund.
The Board considered the potential existence of economies of scale in the provision by the Investment Manager of services to the Funds, and whether those economies of scale were shared with Columbia Acorn Fund, Columbia Acorn European Fund, Columbia Acorn International, and Columbia Acorn International Select through breakpoints in investment management fees or other means, such as expense limitation arrangements and additional investments by the Investment Manager in investment, trading, compliance and other resources. The Board considered the economies of scale that might be realized as each such Fund’s net asset level grows and took note of the extent to which Fund shareholders might also benefit from such growth.  In this regard, the Board took into account that management fees decline as each such Fund’s assets exceed various breakpoints, all of which have not been surpassed. The Board observed that the Management Agreements for each of Columbia Acorn Fund, Columbia Acorn European Fund, Columbia Acorn International, and Columbia Acorn International Select thus provides for breakpoints in the management fee rate schedule that allow opportunities for shareholders to realize lower fees as each such Fund’s assets grow and that there are additional opportunities through other means for sharing economies of scale with shareholders.
Conclusion

The Board reviewed all of the above considerations in reaching its decision to approve the continuation of each of the Management Agreements.  In reaching its conclusions, no single factor was determinative.
On June 26, 2025, the Board, including all of the Independent Trustees, determined that fees payable under the Management Agreements were fair and reasonable in light of the extent and quality of services provided and approved the continuation of the Management Agreements.
Columbia Acorn Trust  | 2025
71

P.O. Box 219104
Kansas City, MO 64121-9104
  
Please read and consider the investment objectives, risks, charges and expenses for any fund carefully before investing. For a prospectus and summary prospectus, which contains this and other important information about the Funds, go to
columbiathreadneedleus.com/investor/. The Funds are distributed by Columbia Management Investment Distributors, Inc., member FINRA, and managed by Columbia Management Investment Advisers, LLC.
Columbia Threadneedle Investments® (Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies. All rights reserved. 
© 2025 Columbia Management Investment Advisers, LLC.
columbiathreadneedleus.com/investor/
SAR110_12_R01_(08/25)



Item 8. Changes in and Disagreements with Accountants for Open-End Management Investment Companies.

Not Applicable.


Item 9. Proxy Disclosures for Open-End Management Investment Companies.

Proxy disclosures for Open-End Management Investment Companies is included in Item 7 of this Form N-CSR.


Item 10. Remuneration Paid to Directors, Officers, and Others of Open-End Management Investment Companies.

The fees and expenses of the independent trustees are included in "Compensation of board members" and "Deferred compensation of board members" on each Fund's Statement of Operations as part of the Registrant's financial statements filed under Item 7 of this Form N-CSR.  Additionally, the compensation paid by the Trust to the Chief Compliance Officer is included in "Compensation of chief compliance officer" on each Fund's Statement of Operations as part of the Registrant's financial statements filed under Item 7 of this Form N-CSR.


Item 11. Statement Regarding Basis for Approval of Investment Advisory Contract.

Statement regarding basis for approval of Investment Advisory Contract is included in Item 7 of this Form N-CSR.


Item 12. Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies.

Not applicable.


Item 13. Portfolio Managers of Closed-End Management Investment Companies.

Not applicable.


Item 14. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers.

Not applicable.


Item 15. Submission of Matters to a Vote of Security Holders.

There were no material changes to the procedures by which shareholders may recommend nominees to the registrant’s board of directors implemented since the registrant last provided disclosure as to such procedures in response to the requirements of Item 407(c)(2)(iv) of Regulation S-K or Item 15 of Form N-CSR.


Item 16. Controls and Procedures.

(a) The registrant’s principal executive officer and principal financial officer, based on their evaluation of the registrant’s disclosure controls and procedures as of a date within 90 days of the filing of this report, have concluded that such controls and procedures are adequately designed to ensure that information required to be disclosed by the registrant in Form N-CSR is accumulated and communicated to the registrant’s management, including the principal executive officer and principal financial officer, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure.

(b) There was no change in the registrant’s internal control over financial reporting that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.


Item 17. Disclosure of Securities Lending Activities for Closed-End Management Investment Companies.

Not applicable.


Item 18. Recovery of Erroneously Awarded Compensation.

Not applicable.



SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

(registrant) Columbia Acorn Trust

By (Signature and Title) /s/ Daniel J. Beckman
Daniel J. Beckman, President and Principal Executive Officer

Date August 21, 2025

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By (Signature and Title) /s/ Daniel J. Beckman
Daniel J. Beckman, President and Principal Executive Officer

Date August 21, 2025

By (Signature and Title) /s/ Michael G. Clarke
Michael G. Clarke, Chief Financial Officer,
Principal Financial Officer and Senior Vice President

Date August 21, 2025

By (Signature and Title) /s/ Charles H. Chiesa
Charles H. Chiesa, Treasurer, Chief Accounting
Officer and Principal Financial Officer

Date August 21, 2025


ATTACHMENTS / EXHIBITS

ATTACHMENTS / EXHIBITS

302_CERTIFICATION

906_CERTIFICATION

EX-101.SCH

IDEA: R1.htm

IDEA: R2.htm

IDEA: R3.htm

IDEA: FilingSummary.xml

IDEA: MetaLinks.json

IDEA: 8dde49b45831039_htm.xml