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Latest WESTFIELD CAPITAL MANAGEMENT CO LP Stock Portfolio

$23.83Billion– No. of Holdings #250

WESTFIELD CAPITAL MANAGEMENT CO LP Performance:
2026 Q1: -1.69%YTD: -1.69%2025: 13.17%
Performance for 2026 Q1 is -1.69%, and YTD is -1.69%, and 2025 is 13.17%.

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

On 2026-05-11, the fund reported it's updated stock portfolio. In the 13F Holdings report, WESTFIELD CAPITAL MANAGEMENT CO LP reported an equity portfolio of $23.8 Billions as of 31 Mar, 2026.

The top stock holdings of WESTFIELD CAPITAL MANAGEMENT CO LP are NVDA, ASND, FIX. The fund has invested 4.6% of it's portfolio in NVIDIA CORPORATION and 4.6% of portfolio in ASCENDIS PHARMA A/S.

The fund managers got completely rid off COMMVAULT SYS INC (CVLT), ATLASSIAN CORPORATION (TEAM) and ADMA BIOLOGICS INC (ADMA) stocks. They significantly reduced their stock positions in INSULET CORP (PODD), UNITEDHEALTH GROUP INC (UNH) and WASTE CONNECTIONS INC (WCN). WESTFIELD CAPITAL MANAGEMENT CO LP opened new stock positions in CHENIERE ENERGY INC (LNG), AMER SPORTS INC and AMERICAN INTL GROUP INC (AIG). The fund showed a lot of confidence in some stocks as they added substantially to PLEXUS CORP (PLXS), ASTERA LABS INC and PALANTIR TECHNOLOGIES INC (PLTR).
WESTFIELD CAPITAL MANAGEMENT CO LP Equity Portfolio Value
Last Reported on: 11 May, 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 -1.69% in the last quarter. In trailing 12 months, it's portfolio return was 21.19%.
  • Performance
  • S&P 500

New Buys

Ticker$ Bought
cheniere energy inc130,258,000
amer sports inc129,623,000
american intl group inc109,768,000
jones lang lasalle inc105,836,000
ross stores inc102,231,000
woodward inc97,420,500
arista networks inc95,817,700
life time group holdings inc85,817,800
New stocks bought by WESTFIELD CAPITAL MANAGEMENT CO LP

Additions

Ticker% Inc.
plexus corp7,294
astera labs inc340
palantir technologies inc336
insmed inc239
alnylam pharmaceuticals inc162
guardant health inc152
celsius hldgs inc144
robinhood mkts inc102
Additions to existing portfolio by WESTFIELD CAPITAL MANAGEMENT CO LP

Reductions

Ticker% Reduced
insulet corp-99.56
unitedhealth group inc-98.8
waste connections inc-98.57
dexcom inc-98.12
advanced micro devices inc-98.00
abbvie inc-97.47
genius sports limited-96.52
rambus inc del-96.01
WESTFIELD CAPITAL MANAGEMENT CO LP reduced stake in above stock

Sold off

Ticker$ Sold
adma biologics inc-127,551,000
blue owl capital inc-66,088,700
alkami technology inc-95,010,400
bicycle therapeutics plc-21,353,500
f n b corp-49,643,200
niq global intelligence plc-39,389,000
draftkings inc new-82,120,100
commvault sys inc-132,515,000
WESTFIELD CAPITAL MANAGEMENT CO LP got rid off the above stocks

Sector Distribution

WESTFIELD CAPITAL MANAGEMENT CO LP has about 26.5% of it's holdings in Technology sector.

Sector%
Technology26.5
Industrials22.9
Others12.8
Consumer Cyclical8.9
Healthcare8.8
Financial Services8.4
Communication Services6.2
Energy2.7

Market Cap. Distribution

WESTFIELD CAPITAL MANAGEMENT CO LP has about 77.3% of it's portfolio invested in the large-cap and mega-cap stocks.

Category%
LARGE-CAP54.6
MEGA-CAP22.7
UNALLOCATED12.2
MID-CAP9.6

Stocks belong to which Index?

About 65% of the stocks held by WESTFIELD CAPITAL MANAGEMENT CO LP either belong to S&P 500 or RUSSELL 2000 index.

Index%
S&P 50042.7
Others35
RUSSELL 200022.3
Top 5 Winners (%)%
CIEN
ciena corp
66.0 %
BE
bloom energy corp
54.3 %
FTI
technipfmc plc
53.5 %
VRT
vertiv holdings co
50.4 %
FIX
comfort sys usa inc
46.0 %
Top 5 Winners ($)$
FIX
comfort sys usa inc
287.4 M
VRT
vertiv holdings co
186.0 M
FTAI
ftai aviation ltd
125.2 M
ASND
ascendis pharma a/s
77.4 M
MKSI
mks inc.
66.0 M
Top 5 Losers (%)%
MNDY
monday com ltd
-52.0 %
SMFR
genedx holdings corp
-47.2 %
MDB
mongodb inc
-41.3 %
APP
applovin corp
-40.5 %
IT
gartner inc
-37.2 %
Top 5 Losers ($)$
MSFT
microsoft corp
-185.5 M
AXON
axon enterprise inc
-135.7 M
SMFR
genedx holdings corp
-78.6 M
NVDA
nvidia corporation
-74.2 M
ARES
ares management corporation
-71.5 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 250 stocks in it's portfolio. About 30.3% of the portfolio is in top 10 stocks. MSFT 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.

Last Reported on: 11 May, 2026
TickerNamesorted ascending% PortfolioShares Held$ ValueType% ChangeOptions