Institutional manager

WESTFIELD CAPITAL MANAGEMENT CO LP

Holds positions in 116 of the S&P 500, worth $12.3bn as reported for the quarter ended 31-mar-2026.

Positions held116of 488 index companies covered

Reported value$12.3bnS&P 500 positions only

Top ten weight50%how concentrated the book is

Filing entities1single filer

Largest positions

The 60 biggest by reported value, of 116 held. The rest are smaller than every one of these.

NvidiaNVDA6.3m$1.10bnInformation Technology Comfort Systems USAFIX620,915$856mIndustrials Apple Inc.AAPL3.1m$795mInformation Technology MicrosoftMSFT1.6m$611mInformation Technology Alphabet Inc. (Class A)GOOGL2.1m$597mCommunication Services Howmet AerospaceHWM2.3m$528mIndustrials AmazonAMZN2.3m$475mConsumer Discretionary Axon EnterpriseAXON1.1m$452mIndustrials BroadcomAVGO1.2m$383mInformation Technology Lilly (Eli)LLY364,579$335mHealth Care Tapestry, Inc.TPR2.2m$310mConsumer Discretionary Meta PlatformsMETA526,822$301mCommunication Services NetflixNFLX2.0m$189mCommunication Services Quanta ServicesPWR331,816$182mIndustrials GE VernovaGEV199,306$174mIndustrials Ares ManagementARES1.6m$172mFinancials Marvell TechnologyMRVL1.7m$166mInformation Technology AmetekAME745,832$160mIndustrials ServiceNowNOW1.4m$146mInformation Technology Royal Caribbean GroupRCL505,765$139mConsumer Discretionary Hilton WorldwideHLT457,425$139mConsumer Discretionary Visa Inc.V456,548$138mFinancials CencoraCOR436,909$137mHealth Care MSCIMSCI233,764$126mFinancials Live Nation EntertainmentLYV810,710$124mCommunication Services Tesla, Inc.TSLA316,102$118mConsumer Discretionary Globe LifeGL842,423$117mFinancials Fifth Third BancorpFITB2.4m$111mFinancials American International GroupAIG1.5m$110mFinancials KeyCorpKEY5.2m$104mFinancials Ross StoresROST471,916$102mConsumer Discretionary Palo Alto NetworksPANW636,483$102mInformation Technology Diamondback EnergyFANG503,474$100mEnergy Palantir TechnologiesPLTR674,557$99mInformation Technology Arista NetworksANET780,402$96mInformation Technology AutoZoneAZO28,363$96mConsumer Discretionary Coherent Corp.COHR396,644$94mInformation Technology JabilJBL349,209$93mInformation Technology GarminGRMN376,362$87mConsumer Discretionary F5, Inc.FFIV298,542$86mInformation Technology O'Reilly AutomotiveORLY887,999$82mConsumer Discretionary Morgan StanleyMS496,558$82mFinancials IDEX CorporationIEX426,019$81mIndustrials Targa ResourcesTRGP304,997$76mEnergy Wynn ResortsWYNN740,013$75mConsumer Discretionary Idexx LaboratoriesIDXX132,860$75mHealth Care Vistra Corp.VST494,875$74mUtilities Rockwell AutomationROK206,277$74mIndustrials C.H. RobinsonCHRW429,500$71mIndustrials Lowe'sLOW300,962$71mConsumer Discretionary CSX CorporationCSX1.7m$68mIndustrials DoorDashDASH443,921$67mConsumer Discretionary Packaging Corporation of AmericaPKG303,771$64mMaterials Microchip TechnologyMCHP970,295$63mInformation Technology Moody's CorporationMCO123,603$54mFinancials SynopsysSNPS132,848$53mInformation Technology Parker HannifinPH58,489$52mIndustrials Bank of AmericaBAC1.1m$52mFinancials KKR & Co.KKR558,136$52mFinancials SalesforceCRM271,963$51mInformation Technology

What this page is not

Positions in S&P 500 constituents only, from 13F filings, which report US listed, long, US custodied holdings. A manager's real book is larger than this in every case: anything outside the index, outside US custody, held through derivatives, or below its reporting obligation is not here.