Fund Holdings — WESTFIELD CAPITAL MANAGEMENT CO LP

Total Portfolio Value
$30.61B
Total Bought
$11.25B
Total Sold
$5.89B
Net Transaction
+$5.36B
Filing Period:
Securities
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SharesValue ($K)
Q1 2026
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Q2 2026
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Change
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Q1 2026
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Q2 2026
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Weight (%)
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Change
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Ascendis Pharma A/S(ASND)04,798,267+4,798,26701,279,7944.18%+1,279,794
Alphabet Inc.(GOOG)2,026,7443,749,074+1,722,330582,8111,339,8064.38%+756,996
NVIDIA Corporation(NVDA)6,317,0398,079,926+1,762,8871,101,6921,616,7125.28%+515,021
Axon Enterprise, Inc.(AXON)1,064,1341,491,490+427,356451,927836,1442.73%+384,217
Snowflake Inc.(SNOW)718,8101,736,498+1,017,688108,411441,9391.44%+333,528
Advanced Micro Devices, Inc.(AMD)5,020403,081+398,0611,021234,1540.76%+233,132
Micron Technology, Inc.(MU)100,434228,203+127,76933,931263,4120.86%+229,481
Broadcom Inc.(AVGO)1,236,9251,556,522+319,597382,841587,9761.92%+205,136
Carpenter Technology Corporation(CRS)0314,082+314,0820193,7380.63%+193,738
MKS Inc.(MKSI)1,046,763928,617-118,146240,557413,0491.35%+172,492
Eli Lilly and Company(LLY)364,579416,732+52,153335,329499,8411.63%+164,512
Caterpillar Inc.(CAT)32,325174,620+142,29522,901185,9530.61%+163,052
PTC Therapeutics, Inc.(PTCT)01,956,156+1,956,1560159,5640.52%+159,564
Life Time Group Holdings, Inc.(LTH)3,185,5155,995,254+2,809,73985,818244,8460.80%+159,028
Gilead Sciences, Inc.(GILD)26,6901,287,629+1,260,9393,720162,6790.53%+158,959
APPLIED MATLS INC936205,592+204,656320148,6430.49%+148,323
Arista Networks, Inc.(ANET)780,4021,317,096+536,69495,818223,7480.73%+127,931
Woodward, Inc.(WWD)272,185526,505+254,32097,420223,9960.73%+126,576
Lam Research Corporation(LRCX)0285,614+285,6140123,7650.40%+123,765
Visa Inc.(V)456,548762,403+305,855137,987261,5730.85%+123,586
Palo Alto Networks, Inc.(PANW)636,483658,331+21,848102,041224,5040.73%+122,463
Guardant Health, Inc.(GH)1,362,5391,624,459+261,920125,858243,7180.80%+117,860
Garmin Ltd.(GRMN)376,362861,057+484,69587,320204,5350.67%+117,216
Morgan Stanley(MS)496,558940,560+444,00281,719196,6150.64%+114,896
ASML HLDG NV
N Y REGISTRY SHS
057,430+57,4300114,2540.37%+114,254
Sandisk Corporation(SNDK)049,024+49,0240111,4660.36%+111,466
GE Vernova Inc.(GEV)199,306241,272+41,966173,974283,4610.93%+109,487
Enpro Inc.(NPO)0286,554+286,5540108,0110.35%+108,011
JFrog Ltd.(FROG)01,114,561+1,114,5610101,2910.33%+101,291
Marriott International, Inc.(MAR)153,219398,962+245,74350,113147,8510.48%+97,738
FTAI Aviation Ltd.(FTAI)2,848,2272,937,228+89,001697,816794,6082.60%+96,793
Cloudflare, Inc.(NET)541,566835,502+293,936111,747204,9320.67%+93,185
ServiceNow, Inc.(NOW)1,394,1872,373,711+979,524145,762235,6620.77%+89,900
Microchip Technology Incorporated(MCHP)970,2951,639,111+668,81662,691149,4870.49%+86,796
Amer Sports, Inc.(AS)3,937,5216,344,923+2,407,402129,623214,7120.70%+85,089
Semtech Corporation(SMTC)1,280,5941,133,268-147,32698,465183,4190.60%+84,955
CSX Corporation(CSX)1,658,2993,154,419+1,496,12068,073149,9300.49%+81,856
Meta Platforms, Inc.(META)526,822677,389+150,567301,410381,5661.25%+80,156
Citigroup Inc.(C)44,457608,124+563,6675,04285,1130.28%+80,071
TTM Technologies, Inc.(TTMI)0416,052+416,052077,8100.25%+77,810
Rhythm Pharmaceuticals, Inc.(RYTM)1,929,1232,208,595+279,472167,776245,2200.80%+77,444
Taiwan Semiconductor Manufacturing Company Limited(TSM)493,504510,999+17,495166,780244,0380.80%+77,258
Forgent Power Solutions, Inc.(FPS)01,370,928+1,370,928076,5800.25%+76,580
Regal Rexnord Corporation(RRX)681,717856,976+175,259127,658204,1230.67%+76,465
MasTec, Inc.(MTZ)249,980374,457+124,47780,429155,7970.51%+75,368
Rubrik, Inc.(RBRK)0937,308+937,308075,2470.25%+75,247
Sprouts Farmers Market, Inc.(SFM)0866,638+866,638073,3000.24%+73,300
Praxis Precision Medicines, Inc.(PRAX)662218,898+218,23621373,2850.24%+73,072
APi Group Corporation(APG)4,634,9296,154,301+1,519,372187,807260,6350.85%+72,827
NUVALENT INC0585,583+585,583072,3200.24%+72,320
Dycom Industries, Inc.(DY)0141,978+141,978071,7830.23%+71,783
FirstCash Holdings, Inc.(FCFS)431,993693,085+261,09281,215149,9280.49%+68,713
Planet Labs PBC(PL)1,637,0413,428,007+1,790,96645,755113,5700.37%+67,815
Teradyne, Inc.(TER)0136,491+136,491066,0400.22%+66,040
SENSATA TECHNOLOGIES HLDG PL
SHS
01,333,853+1,333,853063,6780.21%+63,678
BrightSpring Health Services, Inc.(BTSG)0897,804+897,804062,6130.20%+62,613
Relay Therapeutics, Inc.(RLAY)03,343,496+3,343,496062,5570.20%+62,557
Affirm Holdings, Inc.(AFRM)1,080,6361,352,200+271,56449,515110,2720.36%+60,757
Builders FirstSource, Inc.(BLDR)0656,421+656,421058,7370.19%+58,737
SharkNinja, Inc.(SN)904,5411,008,349+103,80895,791153,5410.50%+57,750
QUANTA SVCS INC331,816331,489-327182,174238,6860.78%+56,512
Roblox Corporation(RBLX)0985,802+985,802053,6080.18%+53,608
Insulet Corporation(PODD)1,682352,717+351,03535353,7010.18%+53,348
argenx SE(ARGX)057,082+57,082052,9590.17%+52,959
Robinhood Markets, Inc.(HOOD)633,384955,544+322,16043,89495,8220.31%+51,928
Flex Ltd.(FLEX)0314,008+314,008050,8910.17%+50,891
Spotify Technology S.A.(SPOT)0110,179+110,179050,5860.17%+50,586
Analog Devices, Inc.(ADI)0126,445+126,445050,2200.16%+50,220
Nasdaq, Inc.(NDAQ)0635,713+635,713050,1070.16%+50,107
Rambus Inc.(RMBS)14,436385,811+371,3751,24251,2130.17%+49,971
SEAGATE TECHNOLOGY HLDNGS PL
ORD SHS
050,734+50,734048,9580.16%+48,958
Synopsys, Inc.(SNPS)132,848226,856+94,00852,672101,1940.33%+48,522
Keysight Technologies, Inc.(KEYS)0134,908+134,908047,2270.15%+47,227
Corning Incorporated(GLW)0184,428+184,428047,1080.15%+47,108
Natera, Inc.(NTRA)754,729726,628-28,101150,938197,2430.64%+46,305
Onto Innovation Inc.(ONTO)326,960299,383-27,57767,050113,3010.37%+46,252
Lumentum Holdings Inc.(LITE)053,807+53,807046,1700.15%+46,170
KeyCorp(KEY)5,193,3346,493,467+1,300,133104,126149,6740.49%+45,548
Oruka Therapeutics, Inc.(ORKA)313,130631,433+318,30315,35960,0930.20%+44,734
Celcuity Inc.(CELC)0417,816+417,816043,7120.14%+43,712
Rockwell Automation, Inc.(ROK)206,277237,136+30,85974,029117,4010.38%+43,373
Target Hospitality Corp.(TH)02,103,813+2,103,813042,8340.14%+42,834
Indivior Pharmaceuticals, Inc.(INDV)01,041,191+1,041,191042,7200.14%+42,720
Marex Group Limited(MRX)0688,665+688,665041,9740.14%+41,974
Penumbra, Inc.(PEN)0131,394+131,394041,4880.14%+41,488
Dutch Bros Inc.(BROS)2,313,3572,184,001-129,356117,195156,8330.51%+39,638
Core Scientific, Inc.(CORZ)1,480,0132,409,894+929,88122,14161,6690.20%+39,528
Impinj, Inc.(PI)0270,646+270,646038,7650.13%+38,765
MACOM Technology Solutions Holdings, Inc.(MTSI)132,457175,952+43,49529,41566,9270.22%+37,512
SiTime Corporation(SITM)049,998+49,998037,2770.12%+37,277
Applied Optoelectronics, Inc.(AAOI)0249,553+249,553036,9740.12%+36,974
Krystal Biotech, Inc.(KRYS)098,707+98,707036,6860.12%+36,686
Everus Construction Group, Inc.(ECG)0221,067+221,067036,6860.12%+36,686
IDEX Corporation(IEX)426,019513,564+87,54580,752116,5530.38%+35,801
Axsome Therapeutics, Inc.(AXSM)0145,145+145,145035,5270.12%+35,527
Silicon Motion Technology Corporation(SIMO)0106,466+106,466035,4880.12%+35,488
iRhythm Holdings, Inc.(IRTC)0288,924+288,924034,3680.11%+34,368
TeraWulf Inc.(WULF)01,336,673+1,336,673033,0160.11%+33,016
Kaiser Aluminum Corporation(KALU)0163,465+163,465031,9790.10%+31,979
D-Wave Quantum Inc.(QBTS)01,313,161+1,313,161031,5030.10%+31,503
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WESTFIELD CAPITAL MANAGEMENT CO LP — 13F Holdings — Q2 2026 | TickerTrail