Institutional manager
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Holds positions in 88 of the S&P 500, worth $11.8bn as reported for the quarter ended 31-mar-2026.
Positions held88of 488 index companies covered
Reported value$11.8bnS&P 500 positions only
Top ten weight65%how concentrated the book is
Filing entities1single filer
Largest positions
The 60 biggest by reported value, of 88 held. The rest are smaller than every one of these.
NvidiaNVDA8.9m$1.56bnInformation TechnologyApple Inc.AAPL4.8m$1.22bnInformation TechnologyMicrosoftMSFT2.9m$1.07bnInformation TechnologyAlphabet Inc. (Class A)GOOGL2.5m$721mCommunication ServicesBroadcomAVGO2.2m$681mInformation TechnologyAmazonAMZN3.2m$659mConsumer DiscretionaryMeta PlatformsMETA1.0m$580mCommunication ServicesMastercardMA1.1m$530mFinancialsLinde plcLIN636,338$315mMaterialsCostcoCOST302,468$301mConsumer StaplesServiceNowNOW2.4m$248mInformation TechnologyIntuitINTU533,736$231mInformation TechnologyMonster BeverageMNST2.9m$213mConsumer StaplesAdvanced Micro DevicesAMD1.0m$212mInformation TechnologyAgilent TechnologiesA1.8m$205mHealth CareO'Reilly AutomotiveORLY2.2m$204mConsumer DiscretionaryIdexx LaboratoriesIDXX351,621$198mHealth CareF5, Inc.FFIV649,948$188mInformation TechnologyAkamai TechnologiesAKAM1.6m$186mInformation TechnologyUnitedHealth GroupUNH673,263$182mHealth CareC.H. RobinsonCHRW1.0m$173mIndustrialsEverest GroupEG506,166$165mFinancialsMartin Marietta MaterialsMLM272,392$160mMaterialsCoherent Corp.COHR668,137$159mInformation TechnologyCienaCIEN398,579$155mInformation TechnologyCopartCPRT4.4m$146mIndustrialsAmphenolAPH1.1m$136mInformation TechnologyBio-TechneTECH2.5m$129mHealth CareChipotle Mexican GrillCMG3.9m$125mConsumer DiscretionaryVeeva SystemsVEEV643,325$113mHealth CareVerisk AnalyticsVRSK547,504$104mIndustrialsTexas InstrumentsTXN424,195$82mInformation TechnologyTyler TechnologiesTYL215,748$74mInformation TechnologyInsulet CorporationPODD139,130$29mHealth CareMarriott InternationalMAR84,631$28mConsumer DiscretionaryLilly (Eli)LLY29,051$27mHealth CareMotorola SolutionsMSI51,961$23mInformation TechnologyPalo Alto NetworksPANW130,453$21mInformation TechnologyVertex PharmaceuticalsVRTX39,547$18mHealth CareLam ResearchLRCX79,447$17mInformation TechnologyAvery DennisonAVY84,465$15mMaterialsDexcomDXCM195,431$12mHealth CareApplied MaterialsAMAT34,940$12mInformation TechnologyWest Pharmaceutical ServicesWST39,725$10mHealth CareMarvell TechnologyMRVL99,542$10mInformation TechnologyCencoraCOR28,475$9mHealth CareOracle CorporationORCL55,726$8mInformation TechnologyWalmartWMT62,950$8mConsumer StaplesIntuitive SurgicalISRG15,142$7mHealth CareProgressive CorporationPGR30,797$6mFinancialsJPMorgan ChaseJPM20,562$6mFinancialsHumanaHUM34,577$6mHealth CareSalesforceCRM28,986$5mInformation TechnologyTJX CompaniesTJX33,796$5mConsumer DiscretionaryBlackstone Inc.BX46,877$5mFinancialsNetflixNFLX53,276$5mCommunication ServicesCRH plcCRH48,117$5mMaterialsTKO Group HoldingsTKO22,676$5mCommunication ServicesVisa Inc.V13,418$4mFinancialsKeysight TechnologiesKEYS14,048$4mInformation Technology
What this page is not
Positions in S&P 500 constituents only, from 13F filings, which report US listed, long, US custodied holdings. A manager's real book is larger than this in every case: anything outside the index, outside US custody, held through derivatives, or below its reporting obligation is not here.