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  Name: WESTFIELD CAPITAL MANAGEMENT CO LLC
  City: BOSTON
  State: MA
  Zip: 02111
   
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Portfolio Summary View Filing
  Filing Report Date : 2023-12-31
  Total Value : $17,157,521,000
  Total Value Change : $2,476,722,000
  Securities Held Change : 5
   
All Securities Held : 239
  New Positions : 32
  Closed Positions : 30
  Increased Positions : 120
  Unchanged Positions : 18
  Decreased Positions : 69

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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 $585,829,000 1,557,889 3.41% 161,923,000 215,353 0.021    Application Software
   (ASND)1 Year Chart         ASND Ascendis Pharma AS 2 - $136.93 $507,658,000 4,030,634 2.96% 151,622,000 228,457 6.237    N/A
   (AAPL)1 Year Chart         AAPL Apple Inc 3 - $169.89 $479,951,000 2,492,864 2.8% 31,238,000 -127,968 0.015    Personal Computers
   (GOOGL)1 Year Chart         GOOGL Alphabet Inc 4 - $156.00 $453,759,000 3,248,331 2.64% 26,757,000 -14,713 0.054    Search Engines & Info...
   (AMZN)1 Year Chart         AMZN Amazon.com Inc 5 - $173.67 $354,765,000 2,334,901 2.07% 52,191,000 -45,323 0.023    Internet Software & S...
   (TDG)1 Year Chart         TDG Transdigm Group Inc 6 - $1,256.58 $323,889,000 320,175 1.89% 50,767,000 -3,763 0.583    Aerospace/Defense Pro...
   (NVDA)1 Year Chart         NVDA NVIDIA Corporation 7 - $826.32 $295,068,000 595,833 1.72% 17,122,000 -43,137 0.024    Semiconductor - Speci...
   (V)1 Year Chart         V Visa Inc 8 - $275.16 $282,823,000 1,086,319 1.65% 30,029,000 -12,739 0.064    Business Services
   (FB)1 Year Chart         FB Meta Platforms Inc 9 - $441.38 $256,420,000 724,433 1.49% 35,859,000 -10,255 0.03    Internet Service Prov...
   (BLDR)1 Year Chart         BLDR Builders Firstsource Inc 10 - $185.26 $236,489,000 1,416,611 1.38% 77,942,000 143,041 0.684    Home Improvement Stores
   (DXCM)1 Year Chart         DXCM DexCom Inc 11 - $138.01 $230,471,000 1,857,286 1.34% 58,065,000 9,421 0.477    Medical Instruments &...
   (UNH)1 Year Chart         UNH Unitedhealth Group Inc 12 - $493.86 $229,055,000 435,077 1.34% 11,849,000 4,275 0.046    Health Care Plans
   (NOW)1 Year Chart         NOW Servicenow, Inc. 13 - $716.25 $209,298,000 296,250 1.22% 39,571,000 -7,397 0.152    Information Technolog...
   (AAXN)1 Year Chart         AAXN Axon Enterprise Inc 14 - $306.24 $189,025,000 731,721 1.1% 50,490,000 35,528 1.151    Aerospace/Defense Pro...
   (SAIA)1 Year Chart         SAIA Saia Inc 15 - $543.02 $164,950,000 376,409 0.96% 10,873,000 -10,087 1.133    Trucking
   (MHO)1 Year Chart         MHO M I Schottenstein Homes Inc 16 - $120.29 $163,144,000 1,184,431 0.95% 80,959,000 206,509 4.12    Residential Construct...
   (AME)1 Year Chart         AME Ametek Inc 17 - $177.93 $161,566,000 979,840 0.94% 7,891,000 -60,193 0.426    Industrial Electrical...
   (CRM)1 Year Chart         CRM Salesforce.com Inc 18 - $273.14 $160,020,000 608,116 0.93% 44,400,000 37,940 0.067    Internet Software & S...
   (ICLR)1 Year Chart         ICLR ICON plc (ADR) 19 - $300.08 $158,193,000 558,847 0.92% 21,274,000 2,830 0.702    Research Services
   (PODD)1 Year Chart         PODD Insulet Corp 20 - $164.17 $153,064,000 705,429 0.89% 51,427,000 68,168 0.926    Medical Instruments &...
   (OPCH)1 Year Chart         OPCH Option Care Health 21 - $29.29 $151,023,000 4,482,732 0.88% 29,795,000 735,344 2.4    Specialized Health Se...
   (LECO)1 Year Chart         LECO Lincoln Electric Holdings Inc 22 - $227.93 $149,578,000 687,841 0.87% 36,873,000 67,867 1.157    Machine Tools & Acces...
   (MRVL)1 Year Chart         MRVL Marvell Technology, Inc. 23 - $67.48 $145,930,000 2,419,659 0.85% 39,684,000 456,872 0.295    N/A
   (HD)1 Year Chart         HD Home Depot Inc 24 - $331.98 $132,326,000 381,839 0.77% 16,569,000 -1,260 0.035    Home Improvement Stores
   (ABBV)1 Year Chart         ABBV Abbvie Inc. 25 New $167.29 $130,134,000 839,739 0.76% 130,134,000 839,739 0.047    Drug Manufacturers - ...
   (SMAR)1 Year Chart         SMAR Smartsheet Inc 26 - $38.08 $129,446,000 2,706,943 0.75% 29,007,000 224,513 2.244    N/A
   (AVTR)1 Year Chart         AVTR Avantor, Inc. 27 - $25.15 $123,714,000 5,418,922 0.72% 34,188,000 1,171,976 0.804    N/A
   (CSGP)1 Year Chart         CSGP CoStar Group Inc 28 - $90.34 $122,249,000 1,398,896 0.71% 70,923,000 731,375 0.344    Business Software & S...
   (COST)1 Year Chart         COST Costco Wholesale Corp 29 - $721.86 $122,211,000 185,146 0.71% 6,046,000 -20,471 0.042    Discount, Variety Stores
   (WSC)1 Year Chart         WSC Willscot Mobile Mini Holdin... 30 - $37.96 $121,025,000 2,719,656 0.71% -3,883,000 -283,652 1.194    N/A
   (RCKT)1 Year Chart         RCKT Rocket Pharmaceuticals 31 - $22.10 $118,138,000 3,941,859 0.69% 32,203,000 -252,137 5.007    N/A
   (NICE)1 Year Chart         NICE NICE Systems Ltd (ADR) 32 - $227.00 $115,566,000 579,249 0.67% 28,693,000 68,229 0.923    Computer Peripherals
   (HUBS)1 Year Chart         HUBS Hubspot Inc 33 - $0.00 $111,469,000 192,010 0.65% 16,154,000 -1,522 0.418    N/A
   (INSP)1 Year Chart         INSP Inspire Medical Systems Inc 34 - $231.01 $110,995,000 545,619 0.65% -34,342,000 -186,781 1.895    N/A
   (GPN)1 Year Chart         GPN Global Payments Inc 35 - $127.47 $110,099,000 866,920 0.64% 16,655,000 57,110 0.29    Business Services
   (UBER)1 Year Chart         UBER Uber Technologies, Inc 36 - $69.31 $109,405,000 1,776,923 0.64% 36,850,000 199,292 0.101    N/A
   (MGM)1 Year Chart         MGM MGM Resorts International 37 - $42.18 $107,295,000 2,401,407 0.63% 34,345,000 416,911 0.486    Gambling/Resorts
   (LEGN)1 Year Chart         LEGN Churchill Cap Corp Iii 38 - $44.42 $106,877,000 1,776,247 0.62% -5,173,000 108,097 1.374    N/A
   (DT)1 Year Chart         DT Dynatrace, Inc. 39 - $0.00 $106,506,000 1,947,452 0.62% 24,255,000 187,311 0.631    N/A
   (STZ)1 Year Chart         STZ Constellation Brands Inc 40 - $261.71 $105,247,000 435,356 0.61% 17,437,000 85,974 0.257    Beverage - Wineries &...
   (CDNS)1 Year Chart         CDNS Cadence Design Systems Inc 41 - $277.08 $104,371,000 383,196 0.61% 13,041,000 -6,601 0.137    Technical & System So...
   (G)1 Year Chart         G Genpact Ltd 42 - $30.69 $103,857,000 2,992,134 0.61% -2,876,000 43,701 1.58    Management Services
   (WDAY)1 Year Chart         WDAY Workday, Inc. 43 - $254.06 $103,809,000 376,037 0.61% 21,387,000 -7,588 0.186    Application Software
   (HXL)1 Year Chart         HXL Hexcel Corp 44 - $64.18 $103,485,000 1,403,184 0.6% 8,231,000 -59,109 1.479    Aerospace/Defense Pro...
   (ROST)1 Year Chart         ROST Ross Stores Inc 45 New $132.15 $102,083,000 737,649 0.59% 102,083,000 737,649 0.207    Apparel Stores
   (FLYW)1 Year Chart         FLYW Flywire Corp 46 - $20.55 $101,553,000 4,386,731 0.59% -10,512,000 872,619 4.366    N/A
   (FFIV)1 Year Chart         FFIV F5 Networks Inc 47 - $191.13 $100,940,000 563,971 0.59% -19,612,000 -184,147 0.923    Internet Software & S...
   (UNP)1 Year Chart         UNP Union Pacific Corp 48 - $243.55 $100,369,000 408,634 0.58% 15,633,000 -7,492 0.061    Railroads
   (LLY)1 Year Chart         LLY Eli Lilly & Co 49 - $724.87 $98,123,000 168,330 0.57% -55,504,000 -117,685 0.018    Drug Manufacturers - ...
   (LPLA)1 Year Chart         LPLA LPL Investment Holdings Inc 50 - $265.42 $97,619,000 428,869 0.57% -44,758,000 -170,235 0.538    Investment Brokerage ...
   (LNTH)1 Year Chart         LNTH Lantheus Holdings, Inc. 51 - $65.20 $96,917,000 1,563,181 0.56% 6,983,000 268,790 2.163    N/A
   (ROK)1 Year Chart         ROK Rockwell Automation Inc 52 - $276.95 $96,700,000 311,454 0.56% 9,989,000 8,130 0.268    Conglomerates
   (MASI)1 Year Chart         MASI Masimo Corp 53 - $135.24 $95,934,000 818,476 0.56% 43,003,000 214,795 1.487    Medical Appliances & ...
   (AVY)1 Year Chart         AVY Avery Dennison Corporation 54 - $217.16 $94,655,000 468,217 0.55% 11,172,000 11,204 0.561    Paper & Paper Products
   (TXRH)1 Year Chart         TXRH Texas Roadhouse Inc 55 - $156.87 $93,937,000 768,526 0.55% 26,374,000 65,480 1.106    Restaurants
   (AIG)1 Year Chart         AIG American International Grou... 56 - $74.63 $93,591,000 1,381,419 0.55% 12,608,000 45,064 0.16    Property & Casualty I...
   (HUBB)1 Year Chart         HUBB Hubbell Inc 57 - $402.27 $93,493,000 284,235 0.54% -39,673,000 -140,660 0.524    Electronics Wholesale
   (FICO)1 Year Chart         FICO Fair Isaac Corp 58 - $1,193.66 $92,030,000 79,063 0.54% 17,646,000 -6,580 0.272    Business Services
   (PGR)1 Year Chart         PGR Progressive Corp 59 - $210.07 $91,873,000 576,800 0.54% 19,054,000 54,054 0.098    Property & Casualty I...
   (PCVX)1 Year Chart         PCVX Vaxcyte, Inc. 60 - $0.00 $91,411,000 1,455,593 0.53% 40,231,000 451,677 1.35    N/A
   (ZS)1 Year Chart         ZS Zscaler Inc 61 - $174.81 $91,297,000 412,063 0.53% 37,450,000 65,980 0.31    N/A
   (CMG)1 Year Chart         CMG Chipotle Mexican Grill Inc 62 - $3,111.97 $90,974,000 39,779 0.53% -42,168,000 -32,903 0.142    Restaurants
   (IDXX)1 Year Chart         IDXX Idexx Laboratories Inc 63 - $489.24 $89,421,000 161,104 0.52% 25,749,000 15,492 0.189    Diagnostic Substances
   (CPRT)1 Year Chart         CPRT Copart Inc 64 - $55.22 $89,192,000 1,820,250 0.52% 12,770,000 46,715 0.382    Auto Dealerships
   (VRT)1 Year Chart         VRT Vertiv Holdings Co 65 - $90.35 $88,174,000 1,835,806 0.51% 41,691,000 586,272 0.487    N/A
   (FIX)1 Year Chart         FIX Comfort Systems USA Inc 66 New $311.40 $87,733,000 426,570 0.51% 87,733,000 426,570 1.172    General Contractors
   (JBHT)1 Year Chart         JBHT JB Hunt Transport Services Inc 67 - $163.74 $87,567,000 438,407 0.51% 6,094,000 6,234 0.415    Trucking
   (CDW)1 Year Chart         CDW Cdw Corp 68 - $243.42 $85,746,000 377,205 0.5% 19,370,000 48,221 0.264    Catalog & Mail Order ...
   (PTC)1 Year Chart         PTC PTC INC 69 - $179.88 $85,301,000 487,544 0.5% 27,146,000 77,077 0.42    Technical & System So...
   (TSLA)1 Year Chart         TSLA Tesla Motors Inc 70 - $170.18 $84,842,000 341,446 0.49% -5,066,000 -17,868 0.011    Auto Manufacturers
   (MSCI)1 Year Chart         MSCI Msci Inc 71 - $464.49 $83,786,000 148,123 0.49% 1,345,000 -12,556 0.179    Business Services
   (SUI)1 Year Chart         SUI Sun Communities Inc 72 - $118.92 $83,744,000 626,591 0.49% 15,482,000 49,758 0.506    REIT - Housing/Apartm...
   (FIVE)1 Year Chart         FIVE Five Below, Inc 73 - $150.85 $83,198,000 390,308 0.48% 11,906,000 -52,773 0.627    Specialty Retail, Other
   (AJG)1 Year Chart         AJG Arthur J Gallagher & Co 74 - $236.95 $82,975,000 368,976 0.48% 670,000 7,880 0.156    Insurance Brokers
   (CE)1 Year Chart         CE Celanese Corp 75 - $153.89 $81,259,000 523,002 0.47% -724,000 -130,144 0.447    Synthetics
   (IEX)1 Year Chart         IEX Idex Corp 76 - $223.28 $80,505,000 370,805 0.47% 5,605,000 10,742 0.49    Diversified Machinery
   (BIO)1 Year Chart         BIO Bio Rad Laboratories Inc 77 - $275.60 $79,822,000 247,210 0.47% -50,055,000 -115,118 0.999    Scientific & Technica...
   (PCTY)1 Year Chart         PCTY Paylocity Holding Corp 78 - $156.58 $79,625,000 483,015 0.46% -6,231,000 10,498 0.89    N/A
   (TENB)1 Year Chart         TENB Tenable Holdings, Inc. 79 - $45.38 $78,520,000 1,704,735 0.46% -19,820,000 -490,357 1.653    N/A
   (CDAY)1 Year Chart         CDAY Ceridian Hcm Holding Inc 80 - $59.58 $78,465,000 1,169,029 0.46% -4,724,000 -57,048 0.679    N/A
   (ARES)1 Year Chart         ARES Ares Management Lp 81 - $0.00 $78,372,000 659,029 0.46% 3,536,000 -68,450 0.393    N/A
   (NBIX)1 Year Chart         NBIX Neurocrine Biosciences Inc 82 - $137.76 $78,323,000 594,437 0.46% 5,278,000 -54,855 0.636    Biotechnology
   (WSO)1 Year Chart         WSO Watsco Inc 83 - $444.00 $77,579,000 181,060 0.45% 10,899,000 4,527 0.504    Building Materials Wh...
   (ITT)1 Year Chart         ITT ITT Corporation 84 - $130.15 $76,719,000 642,965 0.45% 17,734,000 40,521 0.744    Industrial Electrical...
   (MCD)1 Year Chart         MCD McDonalds Corp 85 - $275.60 $76,568,000 258,231 0.45% 71,706,000 239,777 0.035    Restaurants
   (TPR)1 Year Chart         TPR Tapestry Inc 86 - $39.39 $76,398,000 2,075,458 0.45% 18,091,000 47,375 0.748    Textile - Apparel Foo...
   (PPG)1 Year Chart         PPG PPG Industries Inc 87 - $129.23 $76,102,000 508,874 0.44% 9,132,000 -7,074 0.215    Conglomerates
   (MTH)1 Year Chart         MTH Meritage Homes Corp 88 - $165.07 $75,308,000 432,310 0.44% 33,614,000 91,648 1.149    Residential Construct...
   (APO)1 Year Chart         APO Apollo Global Management LLC 89 - $111.88 $75,297,000 807,996 0.44% 1,457,000 -14,637 0.135    Diversified Investments
   (RRR)1 Year Chart         RRR Red Rock Resorts, Inc. 90 - $59.23 $73,951,000 1,386,676 0.43% 18,427,000 32,427 1.947    N/A
   (VMC)1 Year Chart         VMC Vulcan Materials Co 91 - $258.54 $72,273,000 318,371 0.42% 9,641,000 8,340 0.24    General Building Mate...
   (HLT)1 Year Chart         HLT Hilton Worldwide Holdings Inc. 92 - $203.93 $70,592,000 387,679 0.41% 13,789,000 9,448 0.14    Lodging
   (SPGI)1 Year Chart         SPGI S&P Global Inc 93 - $415.50 $69,347,000 157,421 0.4% 1,296,000 -28,810 0.047    Publishing
   (EWBC)1 Year Chart         EWBC East West Bancorp Inc 94 New $76.36 $67,692,000 940,815 0.39% 67,692,000 940,815 0.665    Domestic Regional Banks
   (PANW)1 Year Chart         PANW Palo Alto Networks Inc 95 - $288.79 $67,636,000 229,369 0.39% 122,000 -58,612 0.076    Networking & Communic...
   (COO)1 Year Chart         COO Cooper Companies Inc 96 - $89.93 $268,352,000 709,096 0.39% 11,969,000 15,800 0.332    Medical Instruments &...
   (IOT)1 Year Chart         IOT Samsara Inc. 97 - $34.39 $66,279,000 1,985,589 0.39% 25,602,000 372,073 0.427    N/A
   (WNS)1 Year Chart         WNS WNS Holdings Ltd 98 - $42.00 $65,906,000 1,042,815 0.38% 15,123,000 301,022 2.086    Business Services
   (AMD)1 Year Chart         AMD Advanced Micro Devices Inc 99 - $153.76 $64,550,000 437,891 0.38% 11,406,000 -78,975 0.036    Semiconductor- Broad...
   (PR)1 Year Chart         PR Permian Resources Corp 100 - $17.33 $64,533,000 4,745,073 0.38% 9,789,000 823,574 1.542    N/A

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