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Westfield Capital Management

Westfield Capital Management Portfolio holdings

AUM $23.8B
1-Year Est. Return 49.45%
This Fund
S&P 500
This Quarter Est. Return
+2.63%
1 Year Est. Return
+49.45%
3 Year Est. Return
+148.08%
5 Year Est. Return
+180.9%
10 Year Est. Return
+972.24%
AUM
$23.8B
AUM Growth
-$170M
Cap. Flow
+$283M
Cap. Flow %
1.19%
Top 10 Hldgs %
30.33%
Holding
287
New
46
Increased
118
Reduced
77
Closed
37

Top Buys

Rank Stock Value
1
INSM icon
Insmed
INSM
+$159M
2
AS icon
Amer Sports
AS
+$144M
3
FTAI icon
FTAI Aviation
FTAI
+$132M
4
AXON
Axon Enterprise
AXON
+$121M
5
JLL icon
Jones Lang LaSalle
JLL
+$112M

Top Sells

Rank Stock Value
1
MASI
Masimo
MASI
+$185M
2
BAC icon
Bank of America
BAC
+$142M
3
CVLT icon
Commault Systems
CVLT
+$133M
4
TEAM icon
Atlassian
TEAM
+$132M
5
RVMD icon
Revolution Medicines
RVMD
+$130M

Sector Composition

Rank Sector Weight
1 Technology 28.43%
2 Industrials 25.27%
3 Healthcare 15.8%
4 Consumer Discretionary 10.5%
5 Financials 8.86%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
RYTM icon
26
Rhythm Pharmaceuticals
RYTM
$7.31B
$168M 0.7%
1,929,123
+661,965
+52% +$64.4M
TSM icon
27
TSMC
TSM
$2.07T
$167M 0.7%
493,504
+47,309
+11% +$16.3M
MRVL icon
28
Marvell Technology
MRVL
$169B
$166M 0.7%
1,673,381
-274,426
-14% -$23M
BE icon
29
Bloom Energy
BE
$61.1B
$161M 0.68%
1,191,572
+46,276
+4% +$6.79M
IOT icon
30
Samsara
IOT
$22.3B
$161M 0.67%
5,072,821
+1,118,851
+28% +$34.2M
AME icon
31
Ametek
AME
$54.3B
$160M 0.67%
745,832
-154,384
-17% -$34.3M
PR
32
Permian Resources
PR
$16.9B
$160M 0.67%
7,481,457
+1,530,271
+26% +$26.4M
DT icon
33
Dynatrace
DT
$12.9B
$156M 0.65%
4,209,594
+852,886
+25% +$32.6M
RVMD icon
34
Revolution Medicines
RVMD
$39.6B
$151M 0.64%
1,556,578
-1,288,435
-45% -$130M
NTRA icon
35
Natera
NTRA
$38.9B
$151M 0.63%
754,729
+40,037
+6% +$8.62M
FN icon
36
Fabrinet
FN
$17.1B
$149M 0.62%
284,874
+94,704
+50% +$48.1M
ABVX
37
Abivax
ABVX
$11.9B
$147M 0.62%
1,322,938
+312,972
+31% +$37M
NOW icon
38
ServiceNow
NOW
$106B
$146M 0.61%
1,394,187
-82,616
-6% -$9.72M
FTI icon
39
TechnipFMC
FTI
$28.7B
$141M 0.59%
2,033,755
+81,328
+4% +$4.89M
RCL icon
40
Royal Caribbean
RCL
$77B
$139M 0.58%
505,765
+57,112
+13% +$17M
HLT icon
41
Hilton Worldwide
HLT
$73.1B
$139M 0.58%
457,425
+99,704
+28% +$30.2M
V icon
42
Visa
V
$682B
$138M 0.58%
456,548
-147,378
-24% -$47.4M
COR icon
43
Cencora
COR
$59.9B
$137M 0.58%
436,909
+117,694
+37% +$41.1M
ITT icon
44
ITT
ITT
$17.2B
$134M 0.56%
703,309
+115,863
+20% +$22.1M
CELH icon
45
Celsius Holdings
CELH
$7.41B
$134M 0.56%
3,768,911
+2,224,696
+144% +$105M
NXT icon
46
Nextpower Inc
NXT
$15.6B
$133M 0.56%
1,107,346
+17,046
+2% +$1.89M
LNG icon
47
Cheniere Energy
LNG
$55B
$130M 0.55%
+459,044
New +$106M
AS icon
48
Amer Sports
AS
$21.2B
$130M 0.54%
+3,937,521
New +$144M
RRX icon
49
Regal Rexnord
RRX
$13.8B
$128M 0.54%
681,717
-211,383
-24% -$39.3M
MSCI icon
50
MSCI
MSCI
$45.8B
$126M 0.53%
233,764
+25,972
+12% +$14.6M
1
2
3 4 5

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Westfield Capital Management's Q1 2026 Portfolio in Review

As of Q1 2026, Westfield Capital Management held 287 positions worth $23.8B, down 0.71% from $24B the previous quarter. Its ten largest holdings account for 30% of the portfolio.

Westfield Capital Management's Q1 2026 filing shows 46 new, 118 increased, 77 reduced and 37 closed positions. Its largest new stake was Amer Sports: 3,937,521 shares worth $130M. The largest sale was Masimo, an estimated $185M.

By sector, the portfolio is most concentrated in Technology at 28% of assets, down from 30% a quarter earlier, followed by Industrials and Healthcare.

  • Westfield Capital Management's largest Q1 2026 buy was Amer Sports: 3,937,521 shares worth $130M.
  • Westfield Capital Management added most to Insmed in Q1 2026, an estimated $159M increase.
  • Westfield Capital Management's biggest Q1 2026 reduction was Masimo, cutting an estimated $185M.
  • Westfield Capital Management fully exited Commault Systems in Q1 2026, selling an estimated $133M.
  • Westfield Capital Management's ten largest holdings make up 30% of its $23.8B portfolio in Q1 2026.
  • Westfield Capital Management opened 46 new positions and closed 37 in Q1 2026.
  • Westfield Capital Management's portfolio value fell 0.71% quarter-over-quarter to $23.8B.

Based on Westfield Capital Management's 13F filing for Q1 2026, filed 11 May 2026.