William Blair Investment Management, LLC Top Holdings and 13F Report (2025) About William Blair Investment Management, LLCInvestment ActivityWilliam Blair Investment Management, LLC has $35.62 billion in total holdings as of March 31, 2025.William Blair Investment Management, LLC owns shares of 423 different stocks, but just 117 companies or ETFs make up 80% of its holdings.Approximately 9.59% of the portfolio was purchased this quarter.About 14.85% of the portfolio was sold this quarter.This quarter, William Blair Investment Management, LLC has purchased 433 new stocks and bought additional shares in 114 stocks.William Blair Investment Management, LLC sold shares of 269 stocks and completely divested from 46 stocks this quarter.Largest Holdings Microsoft $1,549,310,689NVIDIA $1,321,979,995Taiwan Semiconductor Manufacturing $1,222,048,689Amazon.com $1,164,035,604Apple $1,163,827,478 Largest New Holdings this Quarter 946784105 - WAYSTAR HLDG CORP $157,936,598 Holding70438V106 - Paylocity $128,703,517 Holding171779309 - Ciena $121,200,281 Holding049468101 - Atlassian $107,279,795 Holding03783C100 - AppFolio $92,928,421 Holding Largest Purchases this Quarter Broadcom 2,431,202 shares (about $407.06M)SEA 1,444,853 shares (about $188.54M)Tyler Technologies 297,728 shares (about $173.10M)WAYSTAR HLDG CORP 4,227,425 shares (about $157.94M)Paylocity 687,005 shares (about $128.70M) Largest Sales this Quarter Advanced Micro Devices 2,062,244 shares (about $211.87M)Accenture 627,404 shares (about $195.78M)LINDE PLC 294,590 shares (about $137.17M)Amazon.com 716,366 shares (about $136.30M)Shopify 1,348,335 shares (about $128.74M) Sector Allocation Over TimeMap of 500 Largest Holdings ofWilliam Blair Investment Management, LLC Selling Neutral Buying Latest 13F Holdings and Changes Since Previous Quarterly FilingIssuer NameHoldings ValueApproximate Purchase/SaleChange in SharesShares Held% of PortfolioSectorMSFTMicrosoft$1,549,310,689$114,100,163 ▼-6.9%4,127,2034.3%Computer and TechnologyNVDANVIDIA$1,321,979,995$117,241,906 ▼-8.1%12,197,6383.7%Computer and TechnologyTSMTaiwan Semiconductor Manufacturing$1,222,048,689$59,819,718 ▼-4.7%7,361,6833.4%Computer and TechnologyAMZNAmazon.com$1,164,035,604$136,295,795 ▼-10.5%6,118,1313.3%Retail/WholesaleAAPLApple$1,163,827,478$29,967,114 ▲2.6%5,239,3983.3%Computer and TechnologyMETAMeta Platforms$906,170,483$52,773,827 ▼-5.5%1,572,2302.5%Computer and TechnologyMAMastercard$666,137,921$121,183,853 ▼-15.4%1,215,3141.9%Business ServicesCGThe Carlyle Group$530,554,729$47,010,202 ▼-8.1%12,171,4781.5%FinanceAVGOBroadcom$515,486,330$407,056,151 ▲375.4%3,078,8171.4%Computer and TechnologyMELIMercadoLibre$498,577,993$5,675,081 ▼-1.1%255,5671.4%Retail/WholesaleSESEA$479,942,216$188,538,303 ▲64.7%3,678,0111.3%Computer and TechnologyPRIMO BRANDS CORPORATION$404,657,406$8,522,640 ▲2.2%11,402,0121.1%CLASS A COM SHSCPRTCopart$385,023,250$7,487,366 ▲2.0%6,803,7331.1%Business ServicesORLYO'Reilly Automotive$370,800,412$33,777,371 ▲10.0%258,8341.0%Retail/WholesaleINTUIntuit$353,421,854$4,891,044 ▼-1.4%575,6151.0%Computer and TechnologyCMGChipotle Mexican Grill$341,545,742$28,951,789 ▲9.3%6,802,3451.0%Retail/WholesaleCOSTCostco Wholesale$334,407,947$15,505,117 ▲4.9%353,5790.9%Retail/WholesaleUNHUnitedHealth Group$327,354,744$19,773,657 ▼-5.7%625,0210.9%MedicalLINDE PLC$321,670,631$137,172,888 ▼-29.9%690,8140.9%SHSLRNStride$293,428,515$18,649,389 ▼-6.0%2,319,5930.8%Consumer DiscretionaryNOWServiceNow$292,065,551$29,715,129 ▼-9.2%366,8520.8%Computer and TechnologyCRMSalesforce$290,815,828$25,276,292 ▼-8.0%1,083,6780.8%Computer and TechnologyYUMCYum China$282,321,484$18,724,420 ▲7.1%5,423,0020.8%Retail/WholesaleBFAMBright Horizons Family Solutions$280,897,763$20,229,723 ▼-6.7%2,211,0970.8%Business ServicesTRUTransUnion$277,542,627$2,195,251 ▼-0.8%3,344,2900.8%Business ServicesCHEChemed$271,694,546$19,673,626 ▼-6.8%441,5500.8%MedicalIDXXIDEXX Laboratories$267,554,764$90,280,011 ▲50.9%637,1110.8%MedicalDOCSDoximity$266,036,620$95,254,272 ▼-26.4%4,584,4670.7%MedicalRACEFerrari$258,070,687$3,628,850 ▲1.4%603,1380.7%Auto/Tires/TrucksEGEverest Group$255,180,030$21,626,849 ▲9.3%702,3370.7%FinanceBRPThe Baldwin Insurance Group$248,586,784$29,266,632 ▲13.3%5,562,4700.7%FinanceCWSTCasella Waste Systems$247,135,710$47,306,222 ▼-16.1%2,216,2650.7%Business ServicesLAM RESEARCH CORP$241,646,076$6,284,188 ▼-2.5%3,323,8800.7%COM NEWDTDynatrace$238,676,836$9,410,574 ▲4.1%5,062,0750.7%Computer and TechnologyCWANClearwater Analytics$236,902,888$15,320,113 ▼-6.1%8,839,6600.7%Computer and TechnologySPOTSpotify Technology$236,731,812$93,033,724 ▲64.7%430,3980.7%Business ServicesMRCYMercury Systems$231,488,012$45,692,765 ▼-16.5%5,372,1980.6%AerospaceLYVLive Nation Entertainment$231,198,811$5,144,330 ▼-2.2%1,770,5530.6%Consumer DiscretionaryTALEN ENERGY CORP$222,231,312$15,608,803 ▼-6.6%1,112,9930.6%COMCFLTConfluent$217,589,418$35,555,105 ▼-14.0%9,282,8250.6%Computer and TechnologyAAgilent Technologies$216,458,343$22,234,267 ▲11.4%1,850,3880.6%MedicalUBERUber Technologies$212,365,042$58,861,481 ▼-21.7%2,914,7000.6%Computer and TechnologyMANHManhattan Associates$207,649,903$89,634,374 ▲76.0%1,200,0110.6%Computer and TechnologyPANWPalo Alto Networks$203,010,067$12,615,586 ▼-5.9%1,189,6980.6%Computer and TechnologySNSharkNinja$191,645,151$44,183,278 ▼-18.7%2,297,6280.5%Retail/WholesaleBCOBrink's$191,238,828$8,968,394 ▼-4.5%2,219,5780.5%Business ServicesRYRoyal Bank of Canada$188,619,994$122,727,066 ▲186.3%1,674,1950.5%FinanceEXLSExlService$185,534,309$57,693,500 ▼-23.7%3,929,9790.5%Business ServicesBAMBrookfield Asset Management$181,935,467$607,175 ▼-0.3%3,755,1180.5%FinanceFLUTTER ENTMT PLC$179,623,878$61,363,147 ▲51.9%810,7600.5%SHSTYLTyler Technologies$179,393,117$173,096,082 ▲2,748.9%308,5590.5%Computer and TechnologyMLIMueller Industries$179,383,632$13,821,466 ▼-7.2%2,355,9710.5%IndustrialsEHCEncompass Health$178,604,039$10,001,501 ▼-5.3%1,763,4680.5%MedicalPLNTPlanet Fitness$178,118,601$17,344,683 ▼-8.9%1,843,6870.5%Consumer DiscretionaryDDOGDatadog$177,164,158$56,935,329 ▲47.4%1,785,7490.5%Computer and TechnologyINSMInsmed$176,475,325$9,172,042 ▼-4.9%2,313,2170.5%MedicalWALWestern Alliance Bancorporation$176,142,917$20,969,519 ▼-10.6%2,292,6320.5%FinanceCGNXCognex$166,983,895$7,226,795 ▼-4.1%5,597,8510.5%Computer and TechnologyGMEDGlobus Medical$166,441,208$76,211,741 ▲84.5%2,273,7870.5%MedicalPODDInsulet$165,060,102$12,545,405 ▼-7.1%628,5370.5%MedicalPOOLPool$163,930,194$12,264,115 ▼-7.0%514,9370.5%Consumer DiscretionaryFTAIFTAI Aviation$158,215,307$23,804,388 ▲17.7%1,424,9780.4%AerospaceWAYSTAR HLDG CORP$157,936,598$157,936,598 ▲New Holding4,227,4250.4%COMQTWOQ2$157,394,632$3,694,942 ▼-2.3%1,967,1870.4%Computer and TechnologyACVAACV Auctions$156,073,648$14,410,928 ▼-8.5%11,076,9090.4%Retail/WholesaleCWCurtiss-Wright$153,943,211$35,369,894 ▲29.8%485,2120.4%AerospaceGTLSChart Industries$150,487,505$7,279,642 ▼-4.6%1,042,4460.4%IndustrialsTWSTTwist Bioscience$149,457,598$33,651,473 ▲29.1%3,806,8670.4%MedicalWSCWillScot Mobile Mini$146,844,076$7,598,296 ▼-4.9%5,282,1610.4%FinanceVEEVVeeva Systems$145,531,044$38,916,851 ▼-21.1%628,2910.4%MedicalELFe.l.f. Beauty$143,012,953$1,739,911 ▼-1.2%2,277,6390.4%Consumer StaplesMLMMartin Marietta Materials$139,973,514$69,544,009 ▼-33.2%292,7520.4%ConstructionCCJCameco$138,405,587$28,718,440 ▼-17.2%3,362,6240.4%Basic MaterialsACHCAcadia Healthcare$133,364,188$23,361,924 ▲21.2%4,398,5550.4%MedicalAPOApollo Global Management$129,436,373$62,191,986 ▼-32.5%945,2050.4%FinanceMNSTMonster Beverage$128,720,299$85,044,658 ▼-39.8%2,199,5950.4%Consumer StaplesPCTYPaylocity$128,703,517$128,703,517 ▲New Holding687,0050.4%Computer and TechnologyBPMCBlueprint Medicines$126,539,915$45,585,040 ▼-26.5%1,429,6680.4%MedicalLANCLancaster Colony$126,053,375$20,661,025 ▼-14.1%720,3050.4%Consumer StaplesNVTnVent Electric$126,042,422$9,799,028 ▼-7.2%2,404,4720.4%Computer and TechnologyONBOld National Bancorp$124,865,741$8,458,688 ▲7.3%5,892,6730.4%FinanceAZEKAZEK$123,110,153$43,474,161 ▼-26.1%2,518,1050.3%ConstructionCIENCiena$121,200,281$121,200,281 ▲New Holding2,005,6310.3%Computer and TechnologyFOLDAmicus Therapeutics$120,593,792$6,683,424 ▼-5.3%14,778,6510.3%MedicalNFENew Fortress Energy$120,566,682$8,795,545 ▼-6.8%14,508,6260.3%EnergyNOVTNovanta$118,776,909$6,003,880 ▼-4.8%928,8880.3%Computer and TechnologyEPAMEPAM Systems$117,598,917$2,923,127 ▼-2.4%696,5110.3%Computer and TechnologyNEOGNeogen$117,555,940$6,830,460 ▼-5.5%13,558,9320.3%MedicalIBNICICI Bank$117,182,330$4,031,863 ▲3.6%3,717,5850.3%FinanceMDGLMadrigal Pharmaceuticals$116,975,531$6,166,178 ▼-5.0%353,1550.3%MedicalINSPInspire Medical Systems$110,367,979$33,399,901 ▼-23.2%692,9180.3%MedicalWMSAdvanced Drainage Systems$110,090,156$2,916,601 ▼-2.6%1,013,2550.3%ConstructionNICENICE$109,565,343$38,245,176 ▼-25.9%710,6660.3%Computer and TechnologyGWREGuidewire Software$108,277,967$9,264,390 ▼-7.9%577,9140.3%Computer and TechnologyTEAMAtlassian$107,279,795$107,279,795 ▲New Holding505,5360.3%Computer and TechnologyITUBItaú Unibanco$106,026,631$28,481,165 ▲36.7%19,276,1520.3%FinanceCHDNChurchill Downs$105,484,845$9,241,579 ▼-8.1%949,7150.3%Consumer DiscretionaryFRPTFreshpet$105,309,854$31,569,835 ▲42.8%1,266,2000.3%Consumer StaplesWGSGeneDx$105,302,722$45,964,615 ▲77.5%1,188,9880.3%MedicalPSTGPure Storage$102,464,509$9,326,449 ▼-8.3%2,314,5360.3%Computer and TechnologyShowing largest 100 holdings. 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