William Blair Investment Management, LLC Top Holdings and 13F Report (2026) About William Blair Investment Management, LLCInvestment ActivityWilliam Blair Investment Management, LLC has $30.83 billion in total holdings as of September 30, 2026.William Blair Investment Management, LLC owns shares of 399 different stocks, but just 106 companies or ETFs make up 80% of its holdings.Approximately 12.11% of the portfolio was purchased this quarter.About 16.69% of the portfolio was sold this quarter.This quarter, William Blair Investment Management, LLC has purchased 403 new stocks and bought additional shares in 107 stocks.William Blair Investment Management, LLC sold shares of 242 stocks and completely divested from 50 stocks this quarter.Largest Holdings Taiwan Semiconductor Manufacturing $2,092,114,776NVIDIA $1,855,276,337Alphabet $1,241,460,954Apple $1,006,662,062Microsoft $877,785,620 Largest New Holdings this Quarter M8769Q102 - TEVA PHARMACEUTICAL INDS LTD $242,311,291 HoldingN14506104 - Elastic $212,328,507 Holding60744M106 - MOBILITY GLOBAL INC $90,741,816 Holding74275K108 - Procore Technologies $86,863,740 Holding88023U101 - SOMNIGROUP INTERNATIONAL INC $70,036,727 Holding Largest Purchases this Quarter TEVA PHARMACEUTICAL INDS LTD 6,118,972 shares (about $242.31M)Micron Technology 210,345 shares (about $224.04M)Elastic 2,315,469 shares (about $212.33M)CrowdStrike 609,385 shares (about $161.33M)Alphabet 417,047 shares (about $143.50M) Largest Sales this Quarter Microsoft 337,225 shares (about $172.96M)Amazon.com 654,282 shares (about $163.01M)Taiwan Semiconductor Manufacturing 349,446 shares (about $159.38M)AstraZeneca 957,312 shares (about $155.94M)Twist Bioscience 720,477 shares (about $139.22M) 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 PortfolioSectorTSMTaiwan Semiconductor Manufacturing$2,092,114,776$159,382,428 ▼-7.1%4,586,9626.8%TechnologyNVDANVIDIA$1,855,276,337$108,567,963 ▼-5.5%8,123,6386.0%TechnologyGOOGLAlphabet$1,241,460,954$143,497,533 ▲13.1%3,608,0594.0%Communication ServicesAAPLApple$1,006,662,062$78,954,370 ▼-7.3%3,022,8283.3%TechnologyMSFTMicrosoft$877,785,620$172,962,671 ▼-16.5%1,711,4172.8%TechnologyAVGOBroadcom$696,529,299$25,564,881 ▼-3.5%1,983,3402.3%TechnologyMETAMeta Platforms$585,058,590$103,945,859 ▼-15.1%806,7771.9%Communication ServicesAMDAdvanced Micro Devices$479,128,597$12,039,437 ▲2.6%783,1971.6%TechnologyMAMastercard$390,246,345$116,006,202 ▼-22.9%707,6471.3%FinanceEVERPURE INC$333,448,981$118,445,746 ▼-26.2%2,549,6941.1%CL AAMZNAmazon.com$332,067,867$163,014,360 ▼-32.9%1,332,8031.1%Consumer DiscretionaryAMATApplied Materials$310,073,835$55,434,122 ▲21.8%606,3471.0%TechnologyTWSTTwist Bioscience$280,993,569$139,224,975 ▼-33.1%1,454,1170.9%HealthcareCGCarlyle Group$270,543,175$35,958,054 ▲15.3%6,821,5630.9%FinanceGEGE Aerospace$266,978,986$20,019,669 ▲8.1%854,9070.9%IndustrialsBAPCredicorp$265,675,380$28,201,929 ▲11.9%699,3850.9%FinanceSNOWSnowflake$265,280,910$40,692,191 ▼-13.3%781,2490.9%TechnologyAPHAmphenol$260,312,330$130,906,856 ▲101.2%3,087,9280.8%TechnologySTXSeagate Technology$255,478,984$79,453,143 ▲45.1%276,9900.8%TechnologyMLIMueller Industries$246,846,982$126,467,083 ▲105.1%4,072,7100.8%IndustrialsFFIVF5$243,491,646$17,504,478 ▼-6.7%546,9510.8%TechnologyTEVA PHARMACEUTICAL INDS LTD$242,311,291$242,311,291 ▲New Holding6,118,9720.8%SHSRGENRepligen$239,021,665$87,434,662 ▲57.7%1,243,4150.8%HealthcareMUMicron Technology$239,016,029$224,040,581 ▲1,496.1%224,4050.8%TechnologyARGXargenex$237,204,488$16,506,451 ▼-6.5%247,4010.8%HealthcareCRWDCrowdStrike$235,837,712$161,334,679 ▲216.5%890,7940.8%TechnologyDTDynatrace$223,683,605$937,640 ▲0.4%3,873,9800.7%TechnologyBWABorgWarner$223,152,693$4,346,074 ▼-1.9%3,712,4050.7%Consumer DiscretionaryPRIMO BRANDS CORPORATION$213,946,711$3,734,276 ▼-1.7%11,230,7980.7%CLASS A COM SHSESTCElastic$212,328,507$212,328,507 ▲New Holding2,315,4690.7%TechnologyTALEN ENERGY CORP$211,928,462$56,315,156 ▲36.2%677,7590.7%COMAAgilent Technologies$211,162,410$10,646,171 ▼-4.8%1,225,4800.7%HealthcareLINDE PLC$207,432,018$32,243,924 ▼-13.5%437,0210.7%SHSONTOOnto Innovation$200,756,510$4,059,838 ▼-2.0%652,1880.7%TechnologyITUBItau Unibanco$181,403,049$59,820,343 ▼-24.8%21,269,5370.6%FinanceHALOHalozyme Therapeutics$178,458,509$98,761,411 ▼-35.6%1,616,4720.6%HealthcareUNHUnitedHealth Group$177,820,962$14,304,012 ▼-7.4%484,4200.6%HealthcareNOWServiceNow$176,481,923$31,393,317 ▼-15.1%1,316,9310.6%TechnologyKRYSKrystal Biotech$173,238,818$16,371,264 ▼-8.6%520,9250.6%HealthcareEGEverest Group$172,063,357$3,173,327 ▼-1.8%471,1870.6%FinanceMDGLMadrigal Pharmaceuticals$169,852,159$6,507,132 ▲4.0%337,0350.6%HealthcareMANHManhattan Associates$168,407,390$34,206,205 ▲25.5%847,5460.5%TechnologyAPPFAppFolio$167,668,207$22,927,657 ▲15.8%836,1670.5%TechnologyGHGuardant Health$167,297,043$66,589,993 ▼-28.5%937,9740.5%HealthcareVSHVishay Intertechnology$166,787,535$118,915,501 ▲248.4%5,124,0410.5%TechnologyCWCurtiss-Wright$166,337,136$6,220,213 ▼-3.6%305,8680.5%IndustrialsCOSTCostco Wholesale$163,513,450$17,967,381 ▼-9.9%179,6180.5%Consumer StaplesIDXXIDEXX Laboratories$159,846,014$4,152,977 ▲2.7%306,1070.5%HealthcareCNQCanadian Natural Resources$157,695,217$13,271,975 ▼-7.8%3,352,8950.5%EnergyAKAMAkamai Technologies$155,501,992$7,794,923 ▼-4.8%1,462,1720.5%TechnologyLOPEGrand Canyon Education$154,671,218$2,804,718 ▼-1.8%1,020,3260.5%Consumer DiscretionaryNVTnVent Electric$154,657,781$32,616,371 ▼-17.4%964,3810.5%IndustrialsHQYHealthEquity$153,927,300$2,932,361 ▼-1.9%1,740,0780.5%HealthcareTRUTransUnion$150,676,559$11,214,664 ▼-6.9%2,465,2580.5%IndustrialsWSTWest Pharmaceutical Services$148,106,261$6,615,094 ▼-4.3%399,4670.5%HealthcareTXNTexas Instruments$147,753,054$5,963,395 ▲4.2%527,5200.5%TechnologyCCJCameco$145,103,393$15,993,124 ▼-9.9%1,674,2060.5%EnergyDIODDiodes$144,842,363$18,024,814 ▼-11.1%1,496,4600.5%TechnologyLSCCLattice Semiconductor$143,000,406$2,771,177 ▼-1.9%1,138,3570.5%TechnologyTOTALENERGIES SE$142,833,838$13,221,246 ▼-8.5%1,665,1430.5%ACTEHCEncompass Health$141,724,402$1,879,086 ▲1.3%1,166,5520.5%HealthcareCHRWC.H. Robinson Worldwide$139,494,369$5,254,505 ▼-3.6%942,7840.5%IndustrialsMNSTMonster Beverage$137,998,102$32,360,882 ▲30.6%3,315,6680.4%Consumer StaplesHBMHudBay Minerals$137,066,846$24,588,181 ▲21.9%5,137,4380.4%MaterialsLECOLincoln Electric$131,203,436$2,902,179 ▼-2.2%495,8930.4%IndustrialsFHNFirst Horizon$128,360,878$17,675,585 ▲16.0%5,576,0590.4%FinanceCLHClean Harbors$127,425,111$2,626,407 ▼-2.0%410,7440.4%IndustrialsBWXTBWX Technologies$126,694,038$2,254,883 ▼-1.7%924,7740.4%IndustrialsVCYTVeracyte$124,732,120$58,821,440 ▲89.2%2,709,2120.4%HealthcareCRSCarpenter Technology$124,252,874$5,071,379 ▼-3.9%319,5640.4%IndustrialsLFUSLittelfuse$123,963,442$12,345,665 ▼-9.1%292,5460.4%TechnologyMARMarriott International$122,679,475$15,668,331 ▲14.6%344,9250.4%Consumer DiscretionaryRACEFerrari$121,191,082$63,015,104 ▲108.3%308,4920.4%Consumer DiscretionaryLAM RESEARCH CORP$119,575,997$85,978,294 ▲255.9%363,9950.4%COM NEWORLYO'Reilly Automotive$119,158,822$39,276,899 ▼-24.8%1,395,1390.4%Consumer DiscretionaryMIRMMirum Pharmaceuticals$118,248,587$1,828,674 ▼-1.5%1,383,3480.4%HealthcareRRXRegal Rexnord$112,935,471$25,289,142 ▼-18.3%728,0990.4%IndustrialsWGSGeneDx$112,805,858$11,538,646 ▲11.4%1,560,2470.4%HealthcareETSY INC$112,341,459$1,936,736 ▼-1.7%1,571,4290.4%COMPTCTPTC Therapeutics$109,712,963$1,882,766 ▼-1.7%1,693,6240.4%HealthcareFORGENT POWER SOLUTIONS INC$109,518,552$15,309,403 ▲16.3%2,925,1750.4%COM SHS CL ATKRTimken$108,669,149$2,808,305 ▼-2.5%930,7850.4%IndustrialsGMEDGlobus Medical$108,407,639$12,168,928 ▲12.6%1,447,3650.4%HealthcareSTRLSterling Infrastructure$108,269,301$1,740,409 ▼-1.6%220,1580.4%IndustrialsGKOSGlaukos$106,962,561$1,677,858 ▼-1.5%651,4560.3%HealthcareNOVTNovanta$106,598,137$2,300,492 ▼-2.1%749,6880.3%TechnologyCYTKCytokinetics$103,883,058$1,799,804 ▼-1.7%1,576,1350.3%HealthcareFRPTFreshpet$102,342,428$1,898,386 ▼-1.8%1,778,0130.3%Consumer StaplesBSYBentley Systems$101,303,098$88,560,000 ▼-46.6%3,170,6760.3%TechnologyJAZZJazz Pharmaceuticals$99,148,208$2,001,259 ▼-2.0%428,2490.3%HealthcareSTEPStepStone Group$98,797,800$15,035,149 ▲17.9%2,276,4470.3%FinanceWFRDWeatherford International$97,563,751$1,642,130 ▼-1.7%1,240,0070.3%EnergyEXPEagle Materials$97,246,932$1,382,355 ▼-1.4%568,6290.3%MaterialsMMSIMerit Medical Systems$96,541,470$1,570,162 ▼-1.6%1,119,5810.3%HealthcareNUNU$96,352,905$186,900 ▲0.2%7,610,8140.3%FinanceRSReliance$96,291,767$50,872,799 ▼-34.6%250,2710.3%IndustrialsJLLJones Lang LaSalle$96,285,239$74,333,016 ▲338.6%315,1520.3%Real EstateNBHCNational Bank$94,479,174$3,410,275 ▼-3.5%2,410,7980.3%FinanceLANDBRIDGE COMPANY LLC$93,065,139$7,201,321 ▼-7.2%1,146,5460.3%CL ATPGTPG$92,154,208$30,877,143 ▲50.4%2,088,2440.3%FinanceShowing largest 100 holdings. 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