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  Name: WILLIAM BLAIR INVESTMENT MANAGEMENT LLC
  City: Chicago
  State: IL
  Zip: 60606
   
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Portfolio Summary View Filing
  Filing Report Date : 2023-12-31
  Total Value : $34,363,331,000
  Total Value Change : $4,270,265,000
  Securities Held Change : 8
   
All Securities Held : 406
  New Positions : 29
  Closed Positions : 27
  Increased Positions : 133
  Unchanged Positions : 0
  Decreased Positions : 244

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Holdings Found : 100     View All Holdings Currently Viewing:  ALL     Page 1 of 1
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Ticker Company Name Position
Rank
New/Closed
Postion
Last
Close
    Value Shares Held
% of
Portfolio
Value
Change
Change In
Shares Held
   % of Company    Industry
   (MSFT)1 Year Chart         MSFT Microsoft Corp 1 - $399.04 $1,474,977,000 3,922,394 4.29% 274,288,000 119,738 0.052    Application Software
   (TSM)1 Year Chart         TSM Taiwan Semiconductor Mfg. C... 2 - $136.58 $1,167,396,000 11,229,201 3.4% 144,156,000 -550,943 0.216    Semiconductor - Integ...
   (GOOGL)1 Year Chart         GOOGL Alphabet Inc 3 - $156.00 $977,510,000 6,997,711 2.84% 122,566,000 464,435 0.117    Search Engines & Info...
   (AMZN)1 Year Chart         AMZN Amazon.com Inc 4 - $173.67 $877,946,000 5,778,239 2.55% 184,855,000 325,984 0.057    Internet Software & S...
   (MELI)1 Year Chart         MELI Mercadolibre Inc 5 - $1,363.83 $589,052,000 374,825 1.71% 67,560,000 -36,485 0.752    Business Services
   (MA)1 Year Chart         MA MasterCard Inc A 6 - $462.11 $575,154,000 1,348,512 1.67% 67,904,000 67,287 0.136    Business Services
   (NVDA)1 Year Chart         NVDA NVIDIA Corporation 7 - $826.32 $536,984,000 1,084,335 1.56% 112,945,000 109,511 0.044    Semiconductor - Speci...
   (LIN)1 Year Chart         LIN Linde Plc 8 - $443.83 $507,433,000 1,235,503 1.48% 7,736,000 -106,506 0.25    N/A
   (CG)1 Year Chart         CG The Carlyle Group Inc 9 - $31.75 $451,569,000 11,097,795 1.31% 183,826,000 2,220,367 3.183    Cigarettes & Other To...
   (UNH)1 Year Chart         UNH Unitedhealth Group Inc 10 - $493.86 $423,694,000 804,782 1.23% -27,968,000 -91,035 0.085    Health Care Plans
   (BWXT)1 Year Chart         BWXT BWX Technologies Inc 11 - $44.15 $355,635,000 4,634,887 1.03% -66,417,000 -993,980 4.863    Closed - End Fund - E...
   (HLS)1 Year Chart         HLS Encompass Health Corp 12 - $82.73 $348,156,000 5,218,171 1.01% -33,070,000 -458,208 5.308    Hospitals
   (PDD)1 Year Chart         PDD Bloom Energy Corp 13 New $125.79 $336,482,000 2,300,793 0.98% 336,482,000 2,300,793 0.339    N/A
   (CP)1 Year Chart         CP Canadian Pacific Railway Li... 14 - $82.09 $335,354,000 4,241,766 0.98% -79,104,000 -1,328,160 0.456    Railroads
   (ACN)1 Year Chart         ACN Accenture Plc 15 - $309.00 $334,042,000 951,930 0.97% 58,575,000 54,964 0.15    Management Services
   (CRM)1 Year Chart         CRM Salesforce.com Inc 16 - $273.14 $329,054,000 1,250,490 0.96% 80,711,000 25,799 0.137    Internet Software & S...
   (ICLR)1 Year Chart         ICLR ICON plc (ADR) 17 - $300.08 $323,943,000 1,144,393 0.94% 67,064,000 101,228 1.438    Research Services
   (INTU)1 Year Chart         INTU Intuit Inc 18 - $626.39 $304,049,000 486,455 0.88% 65,945,000 20,443 0.186    Application Software
   (LYV)1 Year Chart         LYV Live Nation Inc 19 - $88.49 $303,714,000 3,244,811 0.88% 81,856,000 573,108 1.484    Business Services
   (MMSI)1 Year Chart         MMSI Merit Medical Systems Inc 20 - $73.38 $287,971,000 3,791,089 0.84% 19,090,000 -104,606 6.833    Medical Instruments &...
   (ISRG)1 Year Chart         ISRG Intuitive Surgical Inc 21 - $372.63 $286,191,000 848,324 0.83% 63,119,000 85,137 0.237    Medical Appliances & ...
   (CHE)1 Year Chart         CHE Chemed Corp 22 - $573.34 $278,602,000 476,446 0.81% 2,741,000 -54,363 2.987    Consumer Services
   (BCO)1 Year Chart         BCO Brinks Co 23 - $87.13 $277,564,000 3,155,930 0.81% 27,718,000 -283,573 6.344    Security & Protection...
   (LULU)1 Year Chart         LULU Lululemon Athletica Inc 24 - $360.00 $274,273,000 536,434 0.8% 27,101,000 -104,555 0.43    Textile - Apparel Clo...
   (ELF)1 Year Chart         ELF E L F Beauty Inc 25 - $176.03 $270,024,000 1,870,753 0.79% 113,597,000 446,485 3.483    N/A
   (POOL)1 Year Chart         POOL Pool Corporation 26 - $370.00 $265,843,000 666,757 0.77% 49,805,000 60,079 1.579    Wholesale, Other
   (AAXN)1 Year Chart         AAXN Axon Enterprise Inc 27 - $306.24 $261,455,000 1,012,096 0.76% -10,418,000 -354,171 1.593    Aerospace/Defense Pro...
   (PANW)1 Year Chart         PANW Palo Alto Networks Inc 28 - $288.79 $261,140,000 885,580 0.76% 70,423,000 72,080 0.295    Networking & Communic...
   (COST)1 Year Chart         COST Costco Wholesale Corp 29 - $721.86 $260,182,000 394,168 0.76% 13,011,000 -43,333 0.089    Discount, Variety Stores
   (NOW)1 Year Chart         NOW Servicenow, Inc. 30 - $716.25 $259,337,000 367,078 0.75% 64,994,000 19,391 0.188    Information Technolog...
   (NFE)1 Year Chart         NFE New Fortress Energy Llc 31 - $27.24 $256,748,000 6,804,882 0.75% 51,026,000 529,035 4.033    N/A
   (CCK)1 Year Chart         CCK Crown Holdings Inc 32 - $79.78 $255,070,000 2,769,795 0.74% -23,736,000 -381,263 2.055    Packaging & Containers
   (GWRE)1 Year Chart         GWRE Guidewire Software, Inc. 33 - $111.98 $252,533,000 2,315,969 0.73% 40,959,000 -34,854 2.764    Business Software & S...
   (CWST)1 Year Chart         CWST Casella Waste Systems Inc 34 - $94.32 $247,843,000 2,900,110 0.72% 15,337,000 -147,155 5.398    Waste Management
   (DT)1 Year Chart         DT Dynatrace, Inc. 35 - $0.00 $246,410,000 4,505,582 0.72% 67,190,000 670,350 1.461    N/A
   (CPRT)1 Year Chart         CPRT Copart Inc 36 - $55.22 $245,077,000 5,001,567 0.71% 74,788,000 1,049,637 1.05    Auto Dealerships
   (NICE)1 Year Chart         NICE NICE Systems Ltd (ADR) 37 - $227.00 $242,444,000 1,215,412 0.71% 69,515,000 198,006 1.938    Computer Peripherals
   (MRCY)1 Year Chart         MRCY Mercury Systems 38 - $28.79 $239,781,000 6,556,772 0.7% -10,560,000 -192,790 11.283    Communication Equipment
   (ACHC)1 Year Chart         ACHC Acadia Healthcare Company Inc 39 - $73.18 $231,691,000 2,979,564 0.67% 16,619,000 -79,352 3.007    N/A
   (LANC)1 Year Chart         LANC Lancaster Colony Corp 40 - $187.98 $229,870,000 1,381,516 0.67% 14,075,000 73,904 5.016    Housewares & Accessories
   (ZTS)1 Year Chart         ZTS Zoetis Inc. 41 - $153.36 $228,690,000 1,158,687 0.67% 14,999,000 -69,565 0.244    Drugs - Generic
   (FRPT)1 Year Chart         FRPT Freshpet, Inc. 42 - $104.98 $228,162,000 2,629,801 0.66% 47,604,000 -110,907 4.284    N/A
   (CMG)1 Year Chart         CMG Chipotle Mexican Grill Inc 43 - $3,111.97 $223,525,000 97,739 0.65% 36,431,000 -4,396 0.349    Restaurants
   (AMD)1 Year Chart         AMD Advanced Micro Devices Inc 44 - $153.76 $217,552,000 1,475,831 0.63% 76,032,000 99,446 0.123    Semiconductor- Broad...
   (FIVE)1 Year Chart         FIVE Five Below, Inc 45 - $150.85 $213,107,000 999,752 0.62% 46,480,000 -35,840 1.606    Specialty Retail, Other
   (MNST)1 Year Chart         MNST Monster Beverage Corporation 46 - $53.15 $208,834,000 3,624,962 0.61% 27,121,000 193,177 0.511    Beverage Soft Drinks...
   (RACE)1 Year Chart         RACE Ferrari NV 47 - $0.00 $208,244,000 615,323 0.61% 27,838,000 4,894 0.333    N/A
   (EYE)1 Year Chart         EYE National Vision Holdings, Inc. 48 - $17.87 $205,937,000 9,839,344 0.6% 43,060,000 -227,204 10.709    N/A
   (PODD)1 Year Chart         PODD Insulet Corp 49 - $164.17 $199,337,000 918,689 0.58% 82,443,000 185,766 1.206    Medical Instruments &...
   (BLDR)1 Year Chart         BLDR Builders Firstsource Inc 50 - $185.26 $199,177,000 1,193,106 0.58% -15,540,000 -531,668 0.576    Home Improvement Stores
   (WMS)1 Year Chart         WMS Advanced Drainage Systems, ... 51 - $161.34 $195,217,000 1,388,065 0.57% 30,696,000 -57,261 1.969    N/A
   (WAL)1 Year Chart         WAL Western Alliance Bancorpora... 52 - $58.63 $194,050,000 2,949,534 0.56% 35,757,000 -493,865 2.925    Domestic Regional Banks
   (BFAM)1 Year Chart         BFAM Bright Horizons Family Solu... 53 - $106.28 $191,441,000 2,031,419 0.56% 35,592,000 118,227 3.354    Personal Services
   (LRCX)1 Year Chart         LRCX Lam Research Corp 54 - $901.47 $191,426,000 244,396 0.56% 48,466,000 16,306 0.17    Semiconductor Equipme...
   (PEN)1 Year Chart         PEN Penumbra Inc 55 - $205.50 $186,959,000 743,259 0.54% 28,033,000 86,295 2.047    N/A
   (GTLS)1 Year Chart         GTLS Chart Industries Inc 56 - $152.00 $183,230,000 1,344,015 0.53% -103,667,000 -352,396 2.625    Scientific & Technica...
   (TW)1 Year Chart         TW Tradeweb Markets Inc. 57 - $102.15 $176,814,000 1,945,578 0.51% -5,814,000 -331,584 1.752    N/A
   (TYL)1 Year Chart         TYL Tyler Technologies Inc 58 - $458.07 $175,629,000 420,045 0.51% 6,804,000 -17,167 1.044    Information Technolog...
   (CCJ)1 Year Chart         CCJ Cameco Corporation (USA) 59 - $49.16 $175,593,000 4,074,090 0.51% -19,119,000 -837,929 1.029    Industrial Metals & M...
   (TD)1 Year Chart         TD Toronto-Dominion Bank (USA) 60 - $59.11 $174,711,000 2,703,696 0.51% 5,802,000 -100,078 0.149    Domestic Money Center...
   (CRHCF)1 Year Chart         CRHCF CRH Plc 61 - $77.20 $174,379,000 2,521,385 0.51% 173,683,000 2,508,677 0    N/A
   (CF)1 Year Chart         CF CF Industries Holdings Inc 62 - $79.97 $173,770,000 2,185,788 0.51% -74,162,000 -705,887 1.022    Basic Materials Whole...
   (TECH)1 Year Chart         TECH Techne Corp 63 - $62.66 $172,452,000 2,234,998 0.5% 14,920,000 -79,271 1.421    Biotechnology
   (VIRT)1 Year Chart         VIRT Virtu Financial Inc 64 - $22.40 $167,792,000 8,281,950 0.49% 23,634,000 -65,361 6.738    N/A
   (ORLY)1 Year Chart         ORLY O Reilly Automotive Inc 65 - $1,054.13 $166,886,000 175,655 0.49% 5,782,000 -1,604 0.242    Auto Parts Stores
   (TREX)1 Year Chart         TREX Trex Co Inc 66 - $89.41 $166,686,000 2,013,355 0.49% 36,104,000 -105,443 1.739    General Building Mate...
   (MLM)1 Year Chart         MLM Martin Marietta Materials Inc 67 - $597.07 $165,832,000 332,389 0.48% 82,984,000 130,557 0.376    General Building Mate...
   (FOLD)1 Year Chart         FOLD Amicus Therapeutics Inc 68 - $10.61 $165,271,000 11,647,026 0.48% 39,090,000 1,270,263 3.424    Biotechnology
   (INSP)1 Year Chart         INSP Inspire Medical Systems Inc 69 - $231.01 $164,157,000 806,947 0.48% 26,411,000 112,802 2.803    N/A
   (APO)1 Year Chart         APO Apollo Global Management LLC 70 - $111.88 $163,688,000 1,756,502 0.48% -7,123,000 -146,470 0.293    Diversified Investments
   (TXN)1 Year Chart         TXN Texas Instruments Inc 71 - $175.25 $163,242,000 957,654 0.48% 75,212,000 404,039 0.104    Semiconductor- Broad...
   (RGEN)1 Year Chart         RGEN Repligen Corp 72 - $165.66 $162,856,000 905,760 0.47% 12,291,000 -41,133 1.65    Biotechnology
   (NOVT)1 Year Chart         NOVT Novanta Inc 73 - $156.25 $162,800,000 966,688 0.47% 23,497,000 -4,473 2.709    Scientific & Technica...
   (ALRM)1 Year Chart         ALRM Alarm.com Holdings, Inc. 74 - $65.23 $161,543,000 2,499,896 0.47% 6,541,000 -35,300 5.09    N/A
   (BPMC)1 Year Chart         BPMC Blueprint Medicines Corp 75 - $90.73 $159,376,000 1,727,845 0.46% 86,224,000 271,216 2.618    N/A
   (HEI.A)1 Year Chart         HEI.A Heico Corp Class A 76 - $166.87 $153,451,000 1,077,302 0.45% -19,706,000 -262,716 1.334    Aerospace/Defense Pro...
   (NEOG)1 Year Chart         NEOG Neogen Corp 77 - $11.96 $151,552,000 7,536,169 0.44% 62,643,000 2,740,643 3.487    Diagnostic Substances
   (SMCI)1 Year Chart         SMCI Super Micro Computer Inc 78 - $787.40 $150,889,000 530,815 0.44% 10,138,000 17,537 1.025    Networking & Communic...
   (HDB)1 Year Chart         HDB HDFC Bank Limited (ADR) 79 - $58.33 $149,132,000 2,222,817 0.43% -12,029,000 -509,379 0.121    Foreign Regional Banks
   (RE)1 Year Chart         RE Everest Re Group Ltd 80 - $365.76 $148,237,000 419,246 0.43% 50,195,000 155,458 1.046    Life & Health Insurance
   (VRNS)1 Year Chart         VRNS Varonis Systems Inc 81 - $44.84 $147,126,000 3,249,245 0.43% 47,805,000 -2,915 3.061    N/A
   (CSGP)1 Year Chart         CSGP CoStar Group Inc 82 - $90.34 $146,644,000 1,678,036 0.43% 22,718,000 66,306 0.413    Business Software & S...
   (CWAN)1 Year Chart         CWAN Clearwater Analytics Holdin... 83 New $16.58 $145,696,000 7,273,914 0.42% 145,696,000 7,273,914 6.11    N/A
   (NKE)1 Year Chart         NKE Nike Inc B 84 - $93.94 $142,996,000 1,317,083 0.42% 26,236,000 96,002 0.105    Textile - Apparel Foo...
   (FSV)1 Year Chart         FSV FirstService Corporation 85 - $151.62 $140,168,000 864,756 0.41% 14,380,000 473 1.985    N/A
   (BLD)1 Year Chart         BLD Topbuild Corp 86 - $391.25 $135,805,000 362,862 0.4% 40,658,000 -15,306 1.097    N/A
   (GLOB)1 Year Chart         GLOB GLOBANT SA 87 - $179.14 $134,203,000 563,925 0.39% -35,733,000 -294,989 1.425    N/A
   (TENB)1 Year Chart         TENB Tenable Holdings, Inc. 88 - $45.38 $133,838,000 2,905,742 0.39% -1,830,000 -122,568 2.818    N/A
   (INSM)1 Year Chart         INSM Insmed Inc 89 - $24.92 $131,915,000 4,256,687 0.38% 24,806,000 14,752 2.808    Biotechnology
   (TWST)1 Year Chart         TWST Twist Bioscience Corp 90 - $0.00 $130,848,000 3,549,874 0.38% 58,450,000 -23,549 5.36    N/A
   (RYAAY)1 Year Chart         RYAAY Ryanair Holdings Plc (ADR) 91 - $140.00 $125,831,000 943,672 0.37% 32,635,000 -15,293 0.419    Regional Airlines
   (EVH)1 Year Chart         EVH Evolent Health, Inc. 92 - $28.32 $124,802,000 3,778,453 0.36% 53,393,000 1,156,004 3.235    N/A
   (CERT)1 Year Chart         CERT Certara, Inc. 93 - $16.30 $123,874,000 7,042,316 0.36% 19,900,000 -108,598 4.603    N/A
   (SBUX)1 Year Chart         SBUX Starbucks Corp 94 - $87.84 $122,773,000 1,278,750 0.36% 12,928,000 75,230 0.109    Specialty Eateries
   (GMED)1 Year Chart         GMED Genomed Inc 95 - $50.37 $122,206,000 2,293,227 0.36% 7,198,000 -23,145 3.008    N/A
   (FTI)1 Year Chart         FTI Technipfmc Limited 96 - $26.59 $121,647,000 6,040,071 0.35% -22,803,000 -1,061,704 1.344    Oil & Gas Equipment &...
   (HQY)1 Year Chart         HQY Healthequity Inc 97 - $0.00 $118,207,000 1,782,911 0.34% -75,028,000 -862,333 1.995    N/A
   (EXP)1 Year Chart         EXP Eagle Materials Inc 98 - $253.93 $118,146,000 582,460 0.34% 7,098,000 -84,414 1.393    General Building Mate...
   (ENTG)1 Year Chart         ENTG Entegris Inc 99 - $128.54 $116,556,000 972,755 0.34% 20,134,000 -53,995 0.606    Semiconductor Equipme...
   (SPSC)1 Year Chart         SPSC Sps Commerce Inc 100 - $169.43 $112,553,000 580,650 0.33% 15,398,000 11,192 1.496    Networking & Communic...

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