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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 : 2024-03-31
  Total Value : $19,047,713,000
  Total Value Change : $1,890,192,000
  Securities Held Change : 5
   
All Securities Held : 244
  New Positions : 28
  Closed Positions : 25
  Increased Positions : 87
  Unchanged Positions : 12
  Decreased Positions : 117

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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 - $420.21 $640,727,000 1,522,930 3.36% 54,898,000 -34,959 0.02    Application Software
   (ASND)1 Year Chart         ASND Ascendis Pharma AS 2 - $121.12 $616,050,000 4,075,214 3.23% 108,392,000 44,580 6.306    N/A
   (AAPL)1 Year Chart         AAPL Apple Inc 3 - $189.87 $555,123,000 3,237,247 2.91% 75,172,000 744,383 0.019    Personal Computers
   (NVDA)1 Year Chart         NVDA NVIDIA Corporation 4 - $924.79 $542,106,000 599,967 2.85% 247,038,000 4,134 0.024    Semiconductor - Speci...
   (AMZN)1 Year Chart         AMZN Amazon.com Inc 5 - $184.70 $475,019,000 2,633,433 2.49% 120,254,000 298,532 0.026    Internet Software & S...
   (GOOGL)1 Year Chart         GOOGL Alphabet Inc 6 - $176.06 $446,244,000 2,956,626 2.34% -7,515,000 -291,705 0.05    Search Engines & Info...
   (TDG)1 Year Chart         TDG Transdigm Group Inc 7 - $1,291.95 $388,415,000 315,374 2.04% 64,526,000 -4,801 0.575    Aerospace/Defense Pro...
   (FB)1 Year Chart         FB Meta Platforms Inc 8 - $471.91 $341,161,000 702,584 1.79% 84,741,000 -21,849 0.029    Internet Service Prov...
   (BLDR)1 Year Chart         BLDR Builders Firstsource Inc 9 - $167.05 $288,067,000 1,381,284 1.51% 51,578,000 -35,327 0.667    Home Improvement Stores
   (V)1 Year Chart         V Visa Inc 10 - $280.10 $284,660,000 1,019,994 1.49% 1,837,000 -66,325 0.06    Business Services
   (VRT)1 Year Chart         VRT Vertiv Holdings Co 11 - $96.81 $277,619,000 3,399,272 1.46% 189,445,000 1,563,466 0.902    N/A
   (AAXN)1 Year Chart         AAXN Axon Enterprise Inc 12 - $288.79 $221,928,000 709,306 1.17% 32,903,000 -22,415 1.116    Aerospace/Defense Pro...
   (NOW)1 Year Chart         NOW Servicenow, Inc. 13 - $765.05 $214,530,000 281,388 1.13% 5,232,000 -14,862 0.144    Information Technolog...
   (DXCM)1 Year Chart         DXCM DexCom Inc 14 - $131.36 $213,523,000 1,539,461 1.12% -16,948,000 -317,825 0.395    Medical Instruments &...
   (FIX)1 Year Chart         FIX Comfort Systems USA Inc 15 - $316.23 $211,924,000 667,036 1.11% 124,191,000 240,466 1.833    General Contractors
   (UNH)1 Year Chart         UNH Unitedhealth Group Inc 16 - $524.63 $211,057,000 426,637 1.11% -17,998,000 -8,440 0.045    Health Care Plans
   (ICLR)1 Year Chart         ICLR ICON plc (ADR) 17 - $314.72 $180,366,000 536,883 0.95% 22,173,000 -21,964 0.675    Research Services
   (CRM)1 Year Chart         CRM Salesforce.com Inc 18 - $285.61 $177,866,000 590,564 0.93% 17,846,000 -17,552 0.065    Internet Software & S...
   (AME)1 Year Chart         AME Ametek Inc 19 - $166.80 $174,414,000 953,603 0.92% 12,848,000 -26,237 0.415    Industrial Electrical...
   (OPCH)1 Year Chart         OPCH Option Care Health 20 - $29.78 $173,448,000 5,171,385 0.91% 22,425,000 688,653 2.769    Specialized Health Se...
   (MHO)1 Year Chart         MHO M I Schottenstein Homes Inc 21 - $129.24 $166,272,000 1,219,989 0.87% 3,128,000 35,558 4.243    Residential Construct...
   (LECO)1 Year Chart         LECO Lincoln Electric Holdings Inc 22 - $226.97 $165,127,000 646,442 0.87% 15,549,000 -41,399 1.087    Machine Tools & Acces...
   (ABBV)1 Year Chart         ABBV Abbvie Inc. 23 - $166.42 $161,555,000 887,179 0.85% 31,421,000 47,440 0.05    Drug Manufacturers - ...
   (CSGP)1 Year Chart         CSGP CoStar Group Inc 24 - $87.50 $159,138,000 1,647,389 0.84% 36,889,000 248,493 0.405    Business Software & S...
   (SAIA)1 Year Chart         SAIA Saia Inc 25 - $399.14 $151,563,000 259,082 0.8% -13,387,000 -117,327 0.78    Trucking
   (NICE)1 Year Chart         NICE NICE Systems Ltd (ADR) 26 - $193.55 $148,928,000 571,436 0.78% 33,362,000 -7,813 0.911    Computer Peripherals
   (HD)1 Year Chart         HD Home Depot Inc 27 - $344.21 $143,776,000 374,807 0.75% 11,450,000 -7,032 0.035    Home Improvement Stores
   (UBER)1 Year Chart         UBER Uber Technologies, Inc 28 - $65.67 $136,093,000 1,767,673 0.71% 26,688,000 -9,250 0.1    N/A
   (AVTR)1 Year Chart         AVTR Avantor, Inc. 29 - $24.99 $134,095,000 5,244,215 0.7% 10,381,000 -174,707 0.778    N/A
   (WSC)1 Year Chart         WSC Willscot Mobile Mini Holdin... 30 - $40.65 $127,971,000 2,752,063 0.67% 6,946,000 32,407 1.209    N/A
   (PGR)1 Year Chart         PGR Progressive Corp 31 - $209.22 $127,693,000 617,410 0.67% 35,820,000 40,610 0.105    Property & Casualty I...
   (LEGN)1 Year Chart         LEGN Churchill Cap Corp Iii 32 - $45.16 $125,629,000 2,239,774 0.66% 18,752,000 463,527 1.733    N/A
   (CPRT)1 Year Chart         CPRT Copart Inc 33 - $54.50 $125,514,000 2,167,032 0.66% 36,322,000 346,782 0.226    Auto Dealerships
   (COST)1 Year Chart         COST Costco Wholesale Corp 34 - $795.81 $124,002,000 169,256 0.65% 1,791,000 -15,890 0.038    Discount, Variety Stores
   (LNTH)1 Year Chart         LNTH Lantheus Holdings, Inc. 35 - $79.67 $121,867,000 1,958,018 0.64% 24,950,000 394,837 2.709    N/A
   (HUBS)1 Year Chart         HUBS Hubspot Inc 36 - $0.00 $121,826,000 194,437 0.64% 10,357,000 2,427 0.424    N/A
   (FLYW)1 Year Chart         FLYW Flywire Corp 37 - $16.60 $120,018,000 4,837,491 0.63% 18,465,000 450,760 4.047    N/A
   (TSM)1 Year Chart         TSM Taiwan Semiconductor Mfg. C... 38 New $151.68 $116,246,000 854,438 0.61% 116,246,000 854,438 0.016    Semiconductor - Integ...
   (STZ)1 Year Chart         STZ Constellation Brands Inc 39 - $255.43 $116,085,000 427,161 0.61% 10,838,000 -8,195 0.252    Beverage - Wineries &...
   (INSP)1 Year Chart         INSP Inspire Medical Systems Inc 40 - $155.22 $115,620,000 538,294 0.61% 4,625,000 -7,325 1.654    N/A
   (GPN)1 Year Chart         GPN Global Payments Inc 41 - $127.47 $115,448,000 863,745 0.61% 5,349,000 -3,175 0.289    Business Services
   (CDNS)1 Year Chart         CDNS Cadence Design Systems Inc 42 - $288.81 $115,384,000 370,675 0.61% 11,013,000 -12,521 0.133    Technical & System So...
   (WING)1 Year Chart         WING Wingstop Inc. 43 - $386.28 $115,349,000 314,818 0.61% 51,200,000 64,802 0.942    N/A
   (TXRH)1 Year Chart         TXRH Texas Roadhouse Inc 44 - $169.64 $114,419,000 740,719 0.6% 20,482,000 -27,807 1.066    Restaurants
   (MGM)1 Year Chart         MGM MGM Resorts International 45 - $41.03 $111,527,000 2,362,356 0.59% 4,232,000 -39,051 0.478    Gambling/Resorts
   (PCVX)1 Year Chart         PCVX Vaxcyte, Inc. 46 - $0.00 $108,346,000 1,586,095 0.57% 16,935,000 130,502 1.471    N/A
   (RCKT)1 Year Chart         RCKT Rocket Pharmaceuticals 47 - $22.62 $107,330,000 3,984,030 0.56% -10,808,000 42,171 4.302    N/A
   (AIG)1 Year Chart         AIG American International Grou... 48 - $80.54 $106,781,000 1,366,011 0.56% 13,190,000 -15,408 0.159    Property & Casualty I...
   (CMG)1 Year Chart         CMG Chipotle Mexican Grill Inc 49 - $3,213.43 $106,293,000 36,567 0.56% 15,319,000 -3,212 0.131    Restaurants
   (ROST)1 Year Chart         ROST Ross Stores Inc 50 - $132.33 $105,868,000 721,370 0.56% 3,785,000 -16,279 0.203    Apparel Stores
   (UNP)1 Year Chart         UNP Union Pacific Corp 51 - $244.97 $103,904,000 422,492 0.55% 3,535,000 13,858 0.063    Railroads
   (LPLA)1 Year Chart         LPLA LPL Investment Holdings Inc 52 - $267.77 $101,777,000 385,227 0.53% 4,158,000 -43,642 0.483    Investment Brokerage ...
   (MASI)1 Year Chart         MASI Masimo Corp 53 - $124.10 $100,754,000 686,100 0.53% 4,820,000 -132,376 1.246    Medical Appliances & ...
   (AVY)1 Year Chart         AVY Avery Dennison Corporation 54 - $226.30 $100,527,000 450,289 0.53% 5,872,000 -17,928 0.54    Paper & Paper Products
   (APO)1 Year Chart         APO Apollo Global Management LLC 55 - $113.08 $99,716,000 886,761 0.52% 24,419,000 78,765 0.148    Diversified Investments
   (ITT)1 Year Chart         ITT ITT Corporation 56 - $139.36 $98,434,000 723,617 0.52% 21,715,000 80,652 0.838    Industrial Electrical...
   (FFIV)1 Year Chart         FFIV F5 Networks Inc 57 - $191.13 $97,735,000 515,507 0.51% -3,205,000 -48,464 0.844    Internet Software & S...
   (FICO)1 Year Chart         FICO Fair Isaac Corp 58 - $1,411.35 $96,682,000 77,370 0.51% 4,652,000 -1,693 0.266    Business Services
   (WDAY)1 Year Chart         WDAY Workday, Inc. 59 - $257.93 $96,154,000 352,536 0.5% -7,655,000 -23,501 0.175    Application Software
   (MNDY)1 Year Chart         MNDY Mondaycom Ord Shs 60 - $228.83 $93,868,000 415,584 0.49% 35,179,000 103,094 0.942    N/A
   (HUBB)1 Year Chart         HUBB Hubbell Inc 61 - $392.74 $93,613,000 225,547 0.49% 120,000 -58,688 0.416    Electronics Wholesale
   (IDXX)1 Year Chart         IDXX Idexx Laboratories Inc 62 - $543.45 $92,879,000 172,021 0.49% 3,458,000 10,917 0.202    Diagnostic Substances
   (NXPI)1 Year Chart         NXPI NXP Semiconductors NV 63 - $267.72 $92,799,000 374,539 0.49% 84,792,000 339,678 0.134    Semiconductor- Broad...
   (SMAR)1 Year Chart         SMAR Smartsheet Inc 64 - $42.03 $91,871,000 2,386,272 0.48% -37,575,000 -320,671 1.751    N/A
   (DKNG)1 Year Chart         DKNG Draftkings Inc Class A 65 - $0.00 $91,165,000 2,007,587 0.48% 31,698,000 320,579 0.459    N/A
   (DT)1 Year Chart         DT Dynatrace, Inc. 66 - $0.00 $89,323,000 1,923,414 0.47% -17,183,000 -24,038 0.624    N/A
   (CE)1 Year Chart         CE Celanese Corp 67 - $157.34 $89,305,000 519,641 0.47% 8,046,000 -3,361 0.445    Synthetics
   (ROK)1 Year Chart         ROK Rockwell Automation Inc 68 - $269.76 $88,676,000 304,384 0.47% -8,024,000 -7,070 0.262    Conglomerates
   (PTC)1 Year Chart         PTC PTC INC 69 - $184.22 $88,279,000 467,231 0.46% 2,978,000 -20,313 0.402    Technical & System So...
   (FOUR)1 Year Chart         FOUR Shift4 Payments, Inc. 70 - $67.62 $88,088,000 1,333,252 0.46% 30,731,000 561,707 2.167    N/A
   (IEX)1 Year Chart         IEX Idex Corp 71 - $222.33 $87,818,000 359,880 0.46% 7,313,000 -10,925 0.475    Diversified Machinery
   (ARES)1 Year Chart         ARES Ares Management Lp 72 - $0.00 $86,350,000 649,344 0.45% 7,978,000 -9,685 0.387    N/A
   (MTH)1 Year Chart         MTH Meritage Homes Corp 73 - $183.00 $86,091,000 490,660 0.45% 10,783,000 58,350 1.305    Residential Construct...
   (JBHT)1 Year Chart         JBHT JB Hunt Transport Services Inc 74 - $164.80 $85,962,000 431,427 0.45% -1,605,000 -6,980 0.408    Trucking
   (CDW)1 Year Chart         CDW Cdw Corp 75 - $223.64 $85,515,000 334,332 0.45% -231,000 -42,873 0.234    Catalog & Mail Order ...
   (OWL)1 Year Chart         OWL Blue Owl Capital Inc 76 - $19.00 $85,418,000 4,529,065 0.45% 22,070,000 277,526 1.017    N/A
   (VMC)1 Year Chart         VMC Vulcan Materials Co 77 - $259.10 $84,982,000 311,381 0.45% 12,709,000 -6,990 0.235    General Building Mate...
   (MSCI)1 Year Chart         MSCI Msci Inc 78 - $505.33 $84,358,000 150,518 0.44% 572,000 2,395 0.182    Business Services
   (IOT)1 Year Chart         IOT Samsara Inc. 79 - $40.90 $84,225,000 2,228,759 0.44% 17,946,000 243,170 0.479    N/A
   (CSCO)1 Year Chart         CSCO Cisco Systems Inc 80 - $48.17 $84,173,000 1,686,503 0.44% 74,963,000 1,504,204 0.04    Networking & Communic...
   (CWST)1 Year Chart         CWST Casella Waste Systems Inc 81 - $98.55 $83,843,000 848,012 0.44% 19,615,000 96,459 1.417    Waste Management
   (MKSI)1 Year Chart         MKSI MKS Instruments Inc 82 - $128.25 $82,468,000 620,063 0.43% 21,804,000 30,348 0.885    Semiconductor Equipme...
   (HLT)1 Year Chart         HLT Hilton Worldwide Holdings Inc. 83 - $204.19 $80,858,000 379,064 0.42% 10,266,000 -8,615 0.137    Lodging
   (PODD)1 Year Chart         PODD Insulet Corp 84 - $173.42 $80,270,000 468,320 0.42% -72,794,000 -237,109 0.615    Medical Instruments &...
   (PR)1 Year Chart         PR Permian Resources Corp 85 - $16.39 $80,211,000 4,541,934 0.42% 15,678,000 -203,139 0.841    N/A
   (BIO)1 Year Chart         BIO Bio Rad Laboratories Inc 86 - $293.85 $79,726,000 230,509 0.42% -96,000 -16,701 0.932    Scientific & Technica...
   (MDB)1 Year Chart         MDB Mongodb Inc 87 - $370.82 $79,567,000 221,858 0.42% 19,312,000 74,481 0.323    N/A
   (RRR)1 Year Chart         RRR Red Rock Resorts, Inc. 88 - $51.32 $79,453,000 1,328,200 0.42% 5,502,000 -58,476 1.865    N/A
   (COO)1 Year Chart         COO Cooper Companies Inc 89 - $97.31 $78,831,000 776,971 0.41% 11,743,000 599,697 0.391    Medical Instruments &...
   (SUI)1 Year Chart         SUI Sun Communities Inc 90 - $122.33 $77,663,000 604,004 0.41% -6,081,000 -22,587 0.488    REIT - Housing/Apartm...
   (NSIT)1 Year Chart         NSIT Insight Enterprises Inc 91 - $206.79 $75,211,000 405,407 0.39% 19,083,000 88,641 1.008    Catalog & Mail Order ...
   (AZEK)1 Year Chart         AZEK Azek Co Inc. 92 - $0.00 $74,712,000 1,487,700 0.39% 18,783,000 25,515 0.873    N/A
   (HXL)1 Year Chart         HXL Hexcel Corp 93 - $71.97 $74,181,000 1,018,276 0.39% -29,304,000 -384,908 1.073    Aerospace/Defense Pro...
   (AJG)1 Year Chart         AJG Arthur J Gallagher & Co 94 - $257.67 $72,857,000 291,382 0.38% -10,118,000 -77,594 0.123    Insurance Brokers
   (PCOR)1 Year Chart         PCOR Procore Technologies, Inc. 95 - $69.46 $72,346,000 880,442 0.38% 12,051,000 9,385 0.681    N/A
   (OVV)1 Year Chart         OVV Ovintiv Ord Shs 96 - $4.04 $71,882,000 1,385,002 0.38% 8,319,000 -62,246 0.533    Independent Oil & Gas
   (BFAM)1 Year Chart         BFAM Bright Horizons Family Solu... 97 - $109.06 $71,597,000 631,590 0.38% 9,617,000 -26,095 0.991    Personal Services
   (ZS)1 Year Chart         ZS Zscaler Inc 98 - $178.86 $70,942,000 368,283 0.37% -20,355,000 -43,780 0.277    N/A
   (NOG)1 Year Chart         NOG Northern Oil & Gas Inc 99 - $40.01 $69,430,000 1,749,749 0.36% 12,427,000 212,030 1.658    Oil & Gas Drilling & ...
   (NBIX)1 Year Chart         NBIX Neurocrine Biosciences Inc 100 - $142.29 $69,400,000 503,193 0.36% -8,923,000 -91,244 0.539    Biotechnology

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