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Latest WESTFIELD CAPITAL MANAGEMENT CO LP Stock Portfolio

$30.61Billion | No. of Holdings #278

WESTFIELD CAPITAL MANAGEMENT CO LP Performance

2026 Q2+16.07%
YTD+14.11%
2025+13.17%

About WESTFIELD CAPITAL MANAGEMENT CO LP and 13F Hedge Fund Stock Holdings

On 2026-08-12, the fund reported it's updated stock portfolio. In the 13F Holdings report, WESTFIELD CAPITAL MANAGEMENT CO LP reported an equity portfolio of $30.6 Billions as of 30 Jun, 2026. <br><br> The top stock holdings of WESTFIELD CAPITAL MANAGEMENT CO LP are NVDA, GOOG, . The fund has invested 5.3% of it's portfolio in NVIDIA CORPORATION and 4.4% of portfolio in ALPHABET INC. <br><br> The fund managers got completely rid off ASCENDIS PHARMA A/S (ASND), KRATOS DEFENSE & SEC SOLUTIO (KTOS) and AMERICAN INTL GROUP INC (AIG) stocks. They significantly reduced their stock positions in MARVELL TECHNOLOGY INC (MRVL), BLOOM ENERGY CORP (BE) and KARMAN HLDGS INC. WESTFIELD CAPITAL MANAGEMENT CO LP opened new stock positions in ASCENDIS PHARMA A/S, CARPENTER TECHNOLOGY CORP (CRS) and PTC THERAPEUTICS INC (PTCT). The fund showed a lot of confidence in some stocks as they added substantially to PRAXIS PRECISION MEDICINES I (PRAX), APPLIED MATLS INC (AMAT) and INSULET CORP (PODD).
WESTFIELD CAPITAL MANAGEMENT CO LP Equity Portfolio Value
Last Reported on: 12 Aug, 2026
$30.61Billion
  as of Aug 12, 2026

WESTFIELD CAPITAL MANAGEMENT CO LP Annual Return Estimates Vs S&P 500

Our best estimate is that WESTFIELD CAPITAL MANAGEMENT CO LP made a return of 16.07% in the last quarter. In trailing 12 months, it's portfolio return was 23.04%.
  • Performance
  • S&P 500

New Buys

Ticker$ Bought
ascendis pharma a/s1,279,790,000
carpenter technology corp193,738,000
ptc therapeutics inc159,564,000
lam research corp123,765,000
asml hldg nv114,254,000
sandisk corp111,466,000
enpro inc108,011,000
jfrog ltd101,291,000
New stocks bought by WESTFIELD CAPITAL MANAGEMENT CO LP

Additions

Ticker% Inc.
praxis precision medicines i32,966
applied matls inc21,865
insulet corp20,870
advanced micro devices inc7,929
gilead sciences inc4,724
rambus inc del2,572
citigroup inc1,267
vanguard index fds848
Additions to existing portfolio by WESTFIELD CAPITAL MANAGEMENT CO LP

Reductions

Ticker% Reduced
marvell technology inc-99.21
bloom energy corp-99.11
karman hldgs inc-96.39
danaher corp del-90.01
parker-hannifin corp-87.84
netflix inc.-85.24
tesla inc-84.05
bank of amer corp-77.49
WESTFIELD CAPITAL MANAGEMENT CO LP reduced stake in above stock

Sold off

Ticker$ Sold
ascendis pharma a/s-1,100,980,000
kratos defense & sec solutio-110,217,000
american intl group inc-109,768,000
ionq inc-39,606,300
genedx holdings corp-87,924,100
option care health inc-31,841,400
bio-techne corp-44,736,800
palantir technologies inc-98,674,200
WESTFIELD CAPITAL MANAGEMENT CO LP got rid off the above stocks

Sector Distribution

WESTFIELD CAPITAL MANAGEMENT CO LP has about 30.7% of it's holdings in Technology sector.

  • Technology
  • Industrials
  • Others
  • Healthcare
  • Communication Services
  • Financial Services
  • Consumer Cyclical
  • Energy
  • Consumer Defensive
Sector%
Technology30.7
Industrials21.6
Others14.3
Healthcare9.9
Communication Services7.4
Financial Services6.7
Consumer Cyclical5.5
Energy1.5
Consumer Defensive1.1

Market Cap. Distribution

WESTFIELD CAPITAL MANAGEMENT CO LP has about 73.1% of it's portfolio invested in the large-cap and mega-cap stocks.

  • LARGE-CAP
  • MEGA-CAP
  • UNALLOCATED
  • MID-CAP
Category%
LARGE-CAP47
MEGA-CAP26.1
UNALLOCATED14.1
MID-CAP12.1

Stocks belong to which Index?

About 65.2% of the stocks held by WESTFIELD CAPITAL MANAGEMENT CO LP either belong to S&P 500 or RUSSELL 2000 index.

  • S&P 500
  • Others
  • RUSSELL 2000
Index%
S&P 50043.6
Others34.7
RUSSELL 200021.6
Top 5 Winners (%)%
astera labs inc
219.7 %
CRDO
credo technology group holdi
117.1 %
PANW
palo alto networks inc
108.8 %
SMTC
semtech corp
104.1 %
MU
micron technology inc
103.8 %
Top 5 Winners ($)$
FIX
comfort sys usa inc
294.4 M
MKSI
mks inc.
212.3 M
astera labs inc
207.1 M
GOOG
alphabet inc
201.6 M
NVDA
nvidia corporation
184.9 M
Top 5 Losers (%)%
VB
vanguard index fds
-69.2 %
INSM
insmed inc
-33.7 %
PRIM
primoris svcs corp
-30.6 %
PCOR
procore technologies inc
-28.6 %
CALX
calix inc
-22.1 %
Top 5 Losers ($)$
INSM
insmed inc
-88.1 M
PRIM
primoris svcs corp
-32.5 M
CELH
celsius hldgs inc
-28.2 M
NFLX
netflix inc.
-28.0 M
PR
permian resources corp
-19.3 M

WESTFIELD CAPITAL MANAGEMENT CO LP Holdings Map

This heatmap illustrates the top 50 positions within the fund's portfolio.

Current Stock Holdings of WESTFIELD CAPITAL MANAGEMENT CO LP

WESTFIELD CAPITAL MANAGEMENT CO LP has 278 stocks in it's portfolio. About 29.2% of the portfolio is in top 10 stocks. INSM proved to be the most loss making stock for the portfolio. FIX was the most profitable stock for WESTFIELD CAPITAL MANAGEMENT CO LP last quarter.

$30.61BTotal Value
319Positions
12 Aug, 2026Last Reported
Current holdings of Current Stock Holdings of WESTFIELD CAPITAL MANAGEMENT CO LP, last reported on 12 Aug, 2026. Select a row with a linked ticker to view its historical trend.
ExpandHoldingsorted ascending% PortfolioShares Held$ Value% Change
ACWV
Ishares Inc

Ishares Inc

ACWV
WESTFIELD CAPITAL MANAGEMENT CO LP's holding in Ishares Inc over time
0%16,850
$474.5K
0%
new position
ACWV
Ishares Inc

Ishares Inc

ACWV
WESTFIELD CAPITAL MANAGEMENT CO LP's holding in Ishares Inc over time
0%12,090
$417.1K
0%
new position