Filed: 11/12/2025ACC: 0001177719-25-000003
📋 What this filing means
WESTFIELD CAPITAL MANAGEMENT CO LP filed this quarterly 13F‑HR report disclosing 235 equity positions with a total reported market value of $23.83B. This filing provides a transparent view of the manager's long equity holdings as of the quarter end.
235
Positions
$23.83B
Total AUM (reported)
218.48M
Total Shares
Allocation by class
COM$16.04B67.3%
CL A$1.95B8.2%
COM CL A$1.46B6.1%
SPONSORED ADR$1.05B4.4%
SHS$690.01M2.9%
CAP STK CL A$545.67M2.3%
COM NEW$428.94M1.8%
Portfolio Concentration
Top 3$3.14B13.2%
4–10$4.12B17.3%
11–25$3.88B16.3%
Rest$12.69B53.2%
Top 3 weight
13.2%
Top 10 weight
30.5%
Voting Authority Distribution
Total shares with voting rights: 218.48M
Sole
Full voting authority
158.02M
shares
% of voting shares72.3%
Shared
Joint voting authority
0.00
shares
% of voting shares0.0%
None
No voting authority
60.46M
shares
% of voting shares27.7%
Investment Discretion (by position count)
Sole235
Shared0
Other0
Dominant voting typeSole · 72.3% of voting shares
Institutional Holdings235
Rows:
NVIDIA CORPORATION
SOLEShares6.51M
TypeSH
Market value$1.21B
5.09%
Sole
4.66M
Shared
0.00
None
1.84M
ASCENDIS PHARMA A/S
SOLEShares5.26M
TypeSH
Market value$1.05B
4.39%
Sole
3.71M
Shared
0.00
None
1.55M
MICROSOFT CORP
SOLEShares1.71M
TypeSH
Market value$883.23M
3.71%
Sole
1.26M
Shared
0.00
None
449.78K
APPLE INC
SOLEShares3.33M
TypeSH
Market value$849.08M
3.56%
Sole
2.55M
Shared
0.00
None
789.54K
COMFORT SYS USA INC
SOLEShares833.20K
TypeSH
Market value$687.54M
2.88%
Sole
558.22K
Shared
0.00
None
274.98K
META PLATFORMS INC
SOLEShares767.66K
TypeSH
Market value$563.75M
2.37%
Sole
542.06K
Shared
0.00
None
225.59K
AMAZON COM INC
SOLEShares2.54M
TypeSH
Market value$558.09M
2.34%
Sole
1.89M
Shared
0.00
None
647.51K
ALPHABET INC
SOLEShares2.24M
TypeSH
Market value$545.67M
2.29%
Sole
1.60M
Shared
0.00
None
645.35K
AXON ENTERPRISE INC
SOLEShares729.15K
TypeSH
Market value$523.27M
2.20%
Sole
472.41K
Shared
0.00
None
256.74K
HOWMET AEROSPACE INC
SOLEShares2.01M
TypeSH
Market value$393.92M
1.65%
Sole
1.30M
Shared
0.00
None
711.95K
BROADCOM INC
SOLEShares1.17M
TypeSH
Market value$384.79M
1.61%
Sole
820.26K
Shared
0.00
None
346.10K
FTAI AVIATION LTD
SOLEShares2.13M
TypeSH
Market value$355.45M
1.49%
Sole
1.41M
Shared
0.00
None
721.67K
VERTIV HOLDINGS CO
SOLEShares2.25M
TypeSH
Market value$339.02M
1.42%
Sole
1.60M
Shared
0.00
None
645.33K
TRANSDIGM GROUP INC
SOLEShares217.90K
TypeSH
Market value$287.19M
1.21%
Sole
157.36K
Shared
0.00
None
60.54K
TAPESTRY INC
SOLEShares2.45M
TypeSH
Market value$277.46M
1.16%
Sole
1.48M
Shared
0.00
None
971.91K
NETFLIX INC
SOLEShares230.65K
TypeSH
Market value$276.53M
1.16%
Sole
165.51K
Shared
0.00
None
65.14K
SEMTECH CORP
SOLEShares3.38M
TypeSH
Market value$241.53M
1.01%
Sole
2.48M
Shared
0.00
None
902.27K
VISA INC
SOLEShares705.77K
TypeSH
Market value$240.93M
1.01%
Sole
619.26K
Shared
0.00
None
86.51K
SERVICENOW INC
SOLEShares260K
TypeSH
Market value$239.27M
1.00%
Sole
188.28K
Shared
0.00
None
71.72K
MARVELL TECHNOLOGY INC
SOLEShares2.61M
TypeSH
Market value$219.59M
0.92%
Sole
1.86M
Shared
0.00
None
747.17K
ELI LILLY & CO
SOLEShares277K
TypeSH
Market value$211.35M
0.89%
Sole
203.78K
Shared
0.00
None
73.22K
MASIMO CORP
SOLEShares1.42M
TypeSH
Market value$209.41M
0.88%
Sole
1.01M
Shared
0.00
None
411.51K
MERUS N V
SOLEShares2.13M
TypeSH
Market value$200.77M
0.84%
Sole
1.51M
Shared
0.00
None
623.34K
BANK AMERICA CORP
SOLEShares3.86M
TypeSH
Market value$199.19M
0.84%
Sole
2.57M
Shared
0.00
None
1.29M
LEGEND BIOTECH CORP
SOLEShares6.09M
TypeSH
Market value$198.74M
0.83%
Sole
4.39M
Shared
0.00
None
1.70M
| Issuer | Class | Shares | Type | Value / Portfolio % | Voting — Sole | Shared | None |
|---|---|---|---|---|---|---|---|
NVIDIA CORPORATIONSOLE | COM | 6.51M | SH | $1.21B 5.09% | 4.66M | 0.00 | 1.84M |
ASCENDIS PHARMA A/SSOLE | SPONSORED ADR | 5.26M | SH | $1.05B 4.39% | 3.71M | 0.00 | 1.55M |
MICROSOFT CORPSOLE | COM | 1.71M | SH | $883.23M 3.71% | 1.26M | 0.00 | 449.78K |
APPLE INCSOLE | COM | 3.33M | SH | $849.08M 3.56% | 2.55M | 0.00 | 789.54K |
COMFORT SYS USA INCSOLE | COM | 833.20K | SH | $687.54M 2.88% | 558.22K | 0.00 | 274.98K |
META PLATFORMS INCSOLE | CL A | 767.66K | SH | $563.75M 2.37% | 542.06K | 0.00 | 225.59K |
AMAZON COM INCSOLE | COM | 2.54M | SH | $558.09M 2.34% | 1.89M | 0.00 | 647.51K |
ALPHABET INCSOLE | CAP STK CL A | 2.24M | SH | $545.67M 2.29% | 1.60M | 0.00 | 645.35K |
AXON ENTERPRISE INCSOLE | COM | 729.15K | SH | $523.27M 2.20% | 472.41K | 0.00 | 256.74K |
HOWMET AEROSPACE INCSOLE | COM | 2.01M | SH | $393.92M 1.65% | 1.30M | 0.00 | 711.95K |
BROADCOM INCSOLE | COM | 1.17M | SH | $384.79M 1.61% | 820.26K | 0.00 | 346.10K |
FTAI AVIATION LTDSOLE | SHS | 2.13M | SH | $355.45M 1.49% | 1.41M | 0.00 | 721.67K |
VERTIV HOLDINGS COSOLE | COM CL A | 2.25M | SH | $339.02M 1.42% | 1.60M | 0.00 | 645.33K |
TRANSDIGM GROUP INCSOLE | COM | 217.90K | SH | $287.19M 1.21% | 157.36K | 0.00 | 60.54K |
TAPESTRY INCSOLE | COM | 2.45M | SH | $277.46M 1.16% | 1.48M | 0.00 | 971.91K |
NETFLIX INCSOLE | COM | 230.65K | SH | $276.53M 1.16% | 165.51K | 0.00 | 65.14K |
SEMTECH CORPSOLE | COM | 3.38M | SH | $241.53M 1.01% | 2.48M | 0.00 | 902.27K |
VISA INCSOLE | COM CL A | 705.77K | SH | $240.93M 1.01% | 619.26K | 0.00 | 86.51K |
SERVICENOW INCSOLE | COM | 260K | SH | $239.27M 1.00% | 188.28K | 0.00 | 71.72K |
MARVELL TECHNOLOGY INCSOLE | COM | 2.61M | SH | $219.59M 0.92% | 1.86M | 0.00 | 747.17K |
ELI LILLY & COSOLE | COM | 277K | SH | $211.35M 0.89% | 203.78K | 0.00 | 73.22K |
MASIMO CORPSOLE | COM | 1.42M | SH | $209.41M 0.88% | 1.01M | 0.00 | 411.51K |
MERUS N VSOLE | COM | 2.13M | SH | $200.77M 0.84% | 1.51M | 0.00 | 623.34K |
BANK AMERICA CORPSOLE | COM | 3.86M | SH | $199.19M 0.84% | 2.57M | 0.00 | 1.29M |
LEGEND BIOTECH CORPSOLE | SPONSORED ADS | 6.09M | SH | $198.74M 0.83% | 4.39M | 0.00 | 1.70M |
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