2026 Q1 Portfolio Activity
In 2026 Q1, WESTFIELD CAPITAL MANAGEMENT CO LP maintained a portfolio of 287 distinct positions. The most significant new addition was CHENIERE ENERGY INC, now representing 0.55% of the total fund value. They heavily accumulated shares in FTAI AVIATION LTD, increasing the position by 21.2%. The fund also reduced its exposure to BANK AMERICA CORP by 72.1%.
Position History
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Total Positions
287
Quarter
2026 Q1
Top Holding
NVDA (4.6%)
Top 10 Concentration
30.3%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-50 of 287
WESTFIELD CAPITAL MANAGEMENT CO LP Full Holdings List — 2026 Q1
| Stock | History | Sector / Type | Port % | Prev % | Rank / Prev | Conviction | Change | % Change | Influence | Shares | Mkt Value | Avg Cost | Price Held | 1st Owned | Source | Source Date | Date Reported | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NVDA
NVIDIA CORPORAT...
|
Technology | 4.62% | 4.62% |
#1
Prev: #1
|
5.8 |
—
|
365,990 | 6.2% |
P
S
|
6,317,039 | $1,101,691,587 | 2003 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
ASND
ASCENDIS PHARMA...
|
Healthcare | 4.62% | 4.61% |
#2
Prev: #2
|
3.8 |
—
|
-372,256 | -7.2% |
P
S
|
4,813,440 | $1,100,978,089 | 2018 Q2 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
FIX
COMFORT SYS USA...
|
Industrials | 3.59% | 2.60% |
#3
3
Prev: #6
|
2.9 |
—
|
-47,920 | -7.2% |
P
S
|
620,915 | $856,235,416 | 2023 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
AAPL
APPLE INC
|
Technology | 3.34% | 3.71% |
#4
1
Prev: #3
|
2.3 |
—
|
-141,205 | -4.3% |
P
S
|
3,133,113 | $795,152,846 | 2002 Q2 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
FTAI
FTAI AVIATION L...
|
Industrials | 2.93% | 1.93% |
#5
4
Prev: #9
|
4.2 |
—
|
497,602 | 21.2% |
P
S
|
2,848,227 | $697,815,609 | 2024 Q2 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
MSFT
MICROSOFT CORP
|
Technology | 2.56% | 3.27% |
#6
2
Prev: #4
|
1.5 |
—
|
28,294 | 1.7% |
P
S
|
1,649,513 | $610,600,060 | 2002 Q2 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
GOOGL
ALPHABET INC
|
Communication Services | 2.45% | 2.84% |
#7
2
Prev: #5
|
1.5 |
—
|
-151,734 | -7.0% |
P
S
|
2,026,744 | $582,810,504 | 2015 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
HWM
HOWMET AEROSPAC...
|
Industrials | 2.21% | 1.90% |
#8
2
Prev: #10
|
1.4 |
—
|
70,572 | 3.2% |
P
S
|
2,289,697 | $527,683,511 | 2025 Q1 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
VRT
VERTIV HOLDINGS...
|
Industrials | 2.02% | 1.54% |
#9
4
Prev: #13
|
1.3 |
—
|
-356,020 | -15.6% |
P
S
|
1,921,696 | $481,538,482 | 2023 Q3 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
AMZN
AMAZON COM INC
|
Consumer Cyclical | 1.99% | 2.24% |
#10
3
Prev: #7
|
1.3 |
—
|
-51,116 | -2.2% |
P
S
|
2,279,654 | $474,783,586 | 2009 Q3 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
AXON
AXON ENTERPRISE...
|
Industrials | 1.90% | 1.97% |
#11
3
Prev: #8
|
3.3 |
—
|
232,957 | 28.0% |
P
S
|
1,064,134 | $451,927,224 | 2022 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
AVGO
BROADCOM INC
|
Technology | 1.61% | 1.60% |
#12
Prev: #12
|
2.6 |
—
|
124,607 | 11.2% |
P
S
|
1,236,925 | $382,840,683 | 2016 Q1 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
LLY
ELI LILLY & CO
|
Healthcare | 1.41% | 1.24% |
#13
1
Prev: #14
|
3.1 |
—
|
87,030 | 31.4% |
P
S
|
364,579 | $335,329,189 | 2006 Q3 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
TPR
TAPESTRY INC
|
Consumer Cyclical | 1.30% | 1.12% |
#14
1
Prev: #15
|
1.0 |
—
|
100,758 | 4.8% |
P
S
|
2,198,862 | $310,281,358 | 2021 Q1 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
META
META PLATFORMS ...
|
Communication Services | 1.26% | 1.80% |
#15
4
Prev: #11
|
1.0 |
—
|
-128,461 | -19.6% |
P
S
|
526,822 | $301,410,388 | 2013 Q3 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
LPLA
LPL FINL HLDGS ...
|
Financial Services | 1.11% | 0.93% |
#16
2
Prev: #18
|
2.9 |
—
|
255,944 | 40.9% |
P
S
|
881,506 | $265,183,525 | 2013 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
MKSI
MKS INC.
|
Technology | 1.01% | 0.56% |
#17
25
Prev: #42
|
2.9 |
—
|
206,990 | 24.6% |
P
S
|
1,046,763 | $240,556,578 | 2017 Q3 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
INSM
INSMED INC
|
Healthcare | 1.01% | 0.31% |
#18
87
Prev: #105
|
3.4 |
—
|
1,035,938 | 239.5% |
P
S
|
1,468,459 | $240,122,429 | 2020 Q2 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
PCVX
VAXCYTE INC
|
Healthcare | 0.89% | 0.68% |
#19
13
Prev: #32
|
0.9 |
—
|
106,421 | 3.0% |
P
S
|
3,646,138 | $211,877,079 | 2023 Q3 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
RKLB
ROCKET LAB CORP
|
Industrials | 0.85% | 0.75% |
#20
5
Prev: #25
|
2.8 |
—
|
580,168 | 22.4% |
P
S
|
3,172,611 | $203,745,048 | 2024 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
NFLX
NETFLIX INC.
|
Communication Services | 0.79% | 0.62% |
#21
13
Prev: #34
|
2.8 |
—
|
372,447 | 23.3% |
P
S
|
1,969,994 | $189,414,876 | 2002 Q3 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
APG
API GROUP CORP
|
Industrials | 0.79% | 0.55% |
#22
24
Prev: #46
|
2.8 |
—
|
1,181,574 | 34.2% |
P
S
|
4,634,929 | $187,807,323 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
PWR
QUANTA SVCS INC
|
Industrials | 0.76% | 0.48% |
#23
33
Prev: #56
|
2.8 |
—
|
58,288 | 21.3% |
P
S
|
331,816 | $182,173,674 | 2025 Q2 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
GEV
GE VERNOVA INC
|
Industrials | 0.73% | 0.48% |
#24
31
Prev: #55
|
2.3 |
—
|
21,372 | 12.0% |
P
S
|
199,306 | $173,974,371 | 2024 Q3 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
ARES
ARES MANAGEMENT...
|
Financial Services | 0.72% | 0.78% |
#25
2
Prev: #23
|
2.8 |
—
|
421,587 | 36.6% |
P
S
|
1,572,787 | $171,591,074 | 2021 Q3 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
RYTM
RHYTHM PHARMACE...
|
Healthcare | 0.70% | 0.57% |
#26
14
Prev: #40
|
3.3 |
—
|
661,965 | 52.2% |
P
S
|
1,929,123 | $167,775,827 | 2025 Q1 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
TSM
TAIWAN SEMICOND...
|
Technology | 0.70% | 0.56% |
#27
14
Prev: #41
|
2.3 |
—
|
47,309 | 10.6% |
P
S
|
493,504 | $166,779,716 | 2019 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
MRVL
MARVELL TECHNOL...
|
Technology | 0.70% | 0.69% |
#28
2
Prev: #30
|
0.8 |
—
|
-274,426 | -14.1% |
P
S
|
1,673,381 | $165,748,387 | 2006 Q3 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
BE
BLOOM ENERGY CO...
|
Industrials | 0.68% | 0.41% |
#29
41
Prev: #70
|
0.8 |
—
|
46,276 | 4.0% |
P
S
|
1,191,572 | $161,446,090 | 2003 Q2 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
IOT
SAMSARA INC
|
Technology | 0.67% | 0.58% |
#30
8
Prev: #38
|
2.8 |
—
|
1,118,851 | 28.3% |
P
S
|
5,072,821 | $160,757,713 | 2021 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
AME
AMETEK INC
|
Industrials | 0.67% | 0.77% |
#31
7
Prev: #24
|
0.8 |
—
|
-154,384 | -17.1% |
P
S
|
745,832 | $159,876,481 | 2003 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
PR
PERMIAN RESOURC...
|
Energy | 0.67% | 0.35% |
#32
61
Prev: #93
|
2.8 |
—
|
1,530,271 | 25.7% |
P
S
|
7,481,457 | $159,504,663 | 2023 Q3 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
DT
DYNATRACE INC
|
Technology | 0.65% | 0.61% |
#33
2
Prev: #35
|
2.8 |
—
|
852,886 | 25.4% |
P
S
|
4,209,594 | $155,670,786 | 2022 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
RVMD
REVOLUTION MEDI...
|
Healthcare | 0.64% | 0.94% |
#34
18
Prev: #16
|
0.3 |
—
|
-1,288,435 | -45.3% |
P
S
|
1,556,578 | $151,377,191 | 2024 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
NTRA
NATERA INC
|
Healthcare | 0.63% | 0.68% |
#35
4
Prev: #31
|
2.3 |
—
|
40,037 | 5.6% |
P
S
|
754,729 | $150,938,268 | 2024 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
FN
FABRINET
|
Technology | 0.62% | 0.36% |
#36
53
Prev: #89
|
2.7 |
—
|
94,704 | 49.8% |
P
S
|
284,874 | $148,567,570 | 2023 Q2 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
ABVX
ABIVAX SA
|
Healthcare | 0.62% | 0.57% |
#37
2
Prev: #39
|
2.7 |
—
|
312,972 | 31.0% |
P
S
|
1,322,938 | $147,309,146 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
NOW
SERVICENOW INC
|
Technology | 0.61% | 0.94% |
#38
21
Prev: #17
|
0.7 |
—
|
-82,616 | -5.6% |
P
S
|
1,394,187 | $145,762,300 | 2013 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
FTI
TECHNIPFMC PLC
|
Energy | 0.59% | 0.36% |
#39
47
Prev: #86
|
0.7 |
—
|
81,328 | 4.2% |
P
S
|
2,033,755 | $140,593,483 | 2024 Q3 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
RCL
ROYAL CARIBBEAN...
|
Consumer Cyclical | 0.58% | 0.52% |
#40
10
Prev: #50
|
2.2 |
—
|
57,112 | 12.7% |
P
S
|
505,765 | $139,176,354 | 2003 Q2 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
HLT
HILTON WORLDWID...
|
Consumer Cyclical | 0.58% | 0.43% |
#41
24
Prev: #65
|
2.7 |
—
|
99,704 | 27.9% |
P
S
|
457,425 | $139,093,786 | 2002 Q2 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
V
VISA INC
|
Financial Services | 0.58% | 0.88% |
#42
23
Prev: #19
|
0.2 |
—
|
-147,378 | -24.4% |
P
S
|
456,548 | $137,987,039 | 2008 Q1 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
COR
CENCORA INC
|
Healthcare | 0.58% | 0.45% |
#43
18
Prev: #61
|
2.7 |
—
|
117,694 | 36.9% |
P
S
|
436,909 | $137,250,518 | 2025 Q1 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
ITT
ITT INC
|
Industrials | 0.56% | 0.42% |
#44
23
Prev: #67
|
2.2 |
—
|
115,863 | 19.7% |
P
S
|
703,309 | $134,001,464 | 2005 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
CELH
CELSIUS HLDGS I...
|
Consumer Defensive | 0.56% | 0.29% |
#45
71
Prev: #116
|
3.2 |
—
|
2,224,696 | 144.1% |
P
S
|
3,768,911 | $133,720,962 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
NXT
NEXTPOWER INC
|
Technology | 0.56% | 0.40% |
#46
31
Prev: #77
|
0.7 |
—
|
17,046 | 1.6% |
P
S
|
1,107,346 | $133,490,560 | 2023 Q1 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
LNG
CHENIERE ENERGY...
|
Energy | 0.55% | — |
#47
Prev: #—
|
3.7 |
—
|
459,044 | — |
NEW
|
459,044 | $130,258,215 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
AS
AMER SPORTS INC
|
Consumer Cyclical | 0.54% | — |
#48
Prev: #—
|
3.7 |
—
|
3,937,521 | — |
NEW
|
3,937,521 | $129,623,185 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
RRX
REGAL REXNORD C...
|
Industrials | 0.54% | 0.52% |
#49
Prev: #49
|
0.2 |
—
|
-211,383 | -23.7% |
P
S
|
681,717 | $127,658,325 | 2023 Q4 | 13F Filing | 2026-03-31 | 2026-05-11 | |||
|
MSCI
MSCI INC
|
Financial Services | 0.53% | 0.50% |
#50
3
Prev: #53
|
2.2 |
—
|
25,972 | 12.5% |
P
S
|
233,764 | $126,000,886 | 2009 Q1 | 13F Filing | 2026-03-31 | 2026-05-11 |
Showing 1-50 of 287 holdings