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William Blair Investment Management, LLC

Q4 2020 Holdings

Filed 2021-02-09 | 356 holdings | $2.9B | 13F-HR | View on SEC ↗ · Holdings Table ↗

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IssuerClassCUSIPValue ↓Shares% Portfolio
Crown Hldgs Inc(CCK)COM228368106$309.8M3,092,03710.7%
Alarm COM Hldgs Inc(ALRM)COM011642105$296.8M2,868,63010.2%
BJS Whsl Club Hldgs Inc(BJ)COM05550J101$264.6M7,096,4579.1%
Brooks Automation Inc New(AZTA)COM114340102$260.5M3,839,5219.0%
Builders Firstsource Inc(BLDR)COM12008R107$222.9M5,462,7337.7%
Axon Enterprise Inc(AXON)COM05464C101$221.6M1,808,5037.7%
Bright Horizons FAM SOL in D(BFAM)COM109194100$212.6M1,229,1727.3%
Burlington Stores Inc(BURL)COM122017106$158.3M605,1925.5%
Adobe Systems Incorporated(ADBE)COM00724F101$150.0M299,9915.2%
Acadia Healthcare Company in(ACHC)COM00404A109$136.0M2,706,7404.7%
Advanced Micro Devices Inc(AMD)COM007903107$90.6M988,0643.1%
Costco Whsl Corp New(COST)COM22160K105$67.7M179,6252.3%
Darling Ingredients Inc(DAR)COM237266101$58.8M1,019,5532.0%
Boot Barn Hldgs Inc(BOOT)COM099406100$53.9M1,243,3021.9%
Codexis Inc(CDXS)COM192005106$47.0M2,150,8491.6%
Casella Waste SYS Inc(CWST)CL A147448104$45.3M730,9881.6%
Cadence Design System Inc(CDNS)COM127387108$33.3M243,8901.1%
Charles RIV Labs Intl Inc(CRL)COM159864107$32.7M130,9461.1%
Caredx Inc(CDNA)COM14167L103$30.1M415,4211.0%
Align Technology Inc(ALGN)COM016255101$29.4M54,9981.0%
Axogen Inc(AXGN)COM05463X106$24.2M1,351,7710.8%
Conmed Corp(CNMD)COM207410101$21.8M194,7620.8%
Cryolife Inc(AORT)COM228903100$20.7M878,4730.7%
Curtiss Wright Corp(CW)COM231561101$18.2M156,4900.6%
Chart Inds Inc(GTLS)COM PAR $0.0116115Q308$14.6M123,8480.5%
Agilysys Inc(AGYS)COM00847J105$11.3M294,9430.4%
Centene Corp del(CNC)COM15135B101$9.4M156,7460.3%
CNX RES Corp(CNX)COM12653C108$8.8M818,0510.3%
Cavco Inds Inc del(CVCO)COM149568107$6.5M37,1150.2%
Certara Inc(CERT)COM15687V109$6.1M182,3360.2%
Alibaba Group Hldg LTD(BABA)SPONSORED ADS01609W102$2.9M12,4050.1%
Carmax Inc(KMX)COM143130102$2.3M24,1330.1%
Taiwan Semiconductor MFG LTD(TSM)SPONSORED ADS874039100$1.3M12,232,1210.0%
Spdr S&P 500 ETF TR(SPY)TR UNIT78462F103$638.2K1,706,9900.0%
Mercadolibre Inc(MELI)COM58733R102$577.8K344,8910.0%
BWX Technologies Inc(BWXT)COM05605H100$445.3K7,386,8720.0%
SEA LTD(SE)SPONSORD ADS81141R100$414.8K2,083,7940.0%
Amazon COM Inc(AMZN)COM023135106$392.6K120,5380.0%
Encompass Health Corp(EHC)COM29261A100$385.9K4,666,5000.0%
Horizon Therapeutics PUB LSHSG46188101$384.3K5,253,9980.0%
Grand Canyon ED Inc(LOPE)COM38526M106$380.0K4,081,2860.0%
Brinks Co(BCO)COM109696104$377.9K5,248,7200.0%
Microsoft Corp(MSFT)COM594918104$374.1K1,682,1460.0%
Nice LTD(NSY)SPONSORED ADR653656108$361.9K1,276,1600.0%
Pure Storage Inc(PSTG)CL A74624M102$355.2K15,709,1150.0%
Etsy Inc(ETSY)COM29786A106$354.5K1,992,8010.0%
Canadian Natl RY Co(CNI)COM136375102$351.7K3,199,4680.0%
Martin Marietta Matls Inc(MLM)COM573284106$329.7K1,161,1600.0%
TAL Education Group(TAL)SPONSORED ADS874080104$328.6K4,595,3570.0%
Euronet Worldwide Inc(EEFT)COM298736109$290.5K2,004,8900.0%
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