Filed: 2/11/2026ACC: 0001177719-26-000005
📋 What this filing means
WESTFIELD CAPITAL MANAGEMENT CO LP filed this quarterly 13F‑HR report disclosing 241 equity positions with a total reported market value of $24.01B. This filing provides a transparent view of the manager's long equity holdings as of the quarter end.
241
Positions
$24.01B
Total AUM (reported)
220.89M
Total Shares
Allocation by class
COM$16.12B67.2%
CL A$1.69B7.1%
COM CL A$1.45B6.0%
SPONSORED ADR$1.12B4.7%
CAP STK CL A$681.86M2.8%
SHS$671.68M2.8%
COM NEW$531.13M2.2%
Portfolio Concentration
Top 3$3.11B12.9%
4–10$4.02B16.7%
11–25$3.81B15.9%
Rest$13.07B54.5%
Top 3 weight
12.9%
Top 10 weight
29.7%
Voting Authority Distribution
Total shares with voting rights: 220.89M
Sole
Full voting authority
188.34M
shares
% of voting shares85.3%
Shared
Joint voting authority
0.00
shares
% of voting shares0.0%
None
No voting authority
32.55M
shares
% of voting shares14.7%
Investment Discretion (by position count)
Sole241
Shared0
Other0
Dominant voting typeSole · 85.3% of voting shares
Institutional Holdings241
Rows:
NVIDIA CORPORATION
SOLEShares5.95M
TypeSH
Market value$1.11B
4.62%
Sole
4.28M
Shared
0.00
None
1.67M
ASCENDIS PHARMA A/S
SOLEShares5.19M
TypeSH
Market value$1.11B
4.61%
Sole
4.24M
Shared
0.00
None
940.93K
APPLE INC
SOLEShares3.27M
TypeSH
Market value$890.16M
3.71%
Sole
2.44M
Shared
0.00
None
838.36K
MICROSOFT CORP
SOLEShares1.62M
TypeSH
Market value$784.05M
3.27%
Sole
1.16M
Shared
0.00
None
461.59K
ALPHABET INC
SOLEShares2.18M
TypeSH
Market value$681.86M
2.84%
Sole
1.52M
Shared
0.00
None
653.62K
COMFORT SYS USA INC
SOLEShares668.84K
TypeSH
Market value$624.22M
2.60%
Sole
546.91K
Shared
0.00
None
121.92K
AMAZON COM INC
SOLEShares2.33M
TypeSH
Market value$537.99M
2.24%
Sole
1.67M
Shared
0.00
None
665.56K
AXON ENTERPRISE INC
SOLEShares831.18K
TypeSH
Market value$472.05M
1.97%
Sole
608.16K
Shared
0.00
None
223.01K
FTAI AVIATION LTD
SOLEShares2.35M
TypeSH
Market value$462.72M
1.93%
Sole
1.93M
Shared
0.00
None
417.66K
HOWMET AEROSPACE INC
SOLEShares2.22M
TypeSH
Market value$454.96M
1.90%
Sole
1.55M
Shared
0.00
None
664.71K
META PLATFORMS INC
SOLEShares655.28K
TypeSH
Market value$432.55M
1.80%
Sole
471.35K
Shared
0.00
None
183.93K
BROADCOM INC
SOLEShares1.11M
TypeSH
Market value$384.97M
1.60%
Sole
777.69K
Shared
0.00
None
334.63K
VERTIV HOLDINGS CO
SOLEShares2.28M
TypeSH
Market value$369.01M
1.54%
Sole
1.79M
Shared
0.00
None
487.31K
ELI LILLY & CO
SOLEShares277.55K
TypeSH
Market value$298.28M
1.24%
Sole
201.52K
Shared
0.00
None
76.03K
TAPESTRY INC
SOLEShares2.10M
TypeSH
Market value$268.07M
1.12%
Sole
1.74M
Shared
0.00
None
356.26K
REVOLUTION MEDICINES INC
SOLEShares2.85M
TypeSH
Market value$226.61M
0.94%
Sole
2.54M
Shared
0.00
None
304.80K
SERVICENOW INC
SOLEShares1.48M
TypeSH
Market value$226.23M
0.94%
Sole
1M
Shared
0.00
None
473.81K
LPL FINL HLDGS INC
SOLEShares625.56K
TypeSH
Market value$223.43M
0.93%
Sole
524.25K
Shared
0.00
None
101.31K
VISA INC
SOLEShares603.93K
TypeSH
Market value$211.80M
0.88%
Sole
467.17K
Shared
0.00
None
136.75K
BANK AMERICA CORP
SOLEShares3.82M
TypeSH
Market value$210.30M
0.88%
Sole
2.42M
Shared
0.00
None
1.41M
TESLA INC
SOLEShares461.68K
TypeSH
Market value$207.62M
0.86%
Sole
312.72K
Shared
0.00
None
148.96K
MASIMO CORP
SOLEShares1.52M
TypeSH
Market value$197.96M
0.82%
Sole
1.33M
Shared
0.00
None
187.97K
ARES MANAGEMENT CORPORATION
SOLEShares1.15M
TypeSH
Market value$186.07M
0.78%
Sole
756.26K
Shared
0.00
None
394.94K
AMETEK INC
SOLEShares900.22K
TypeSH
Market value$184.82M
0.77%
Sole
740.39K
Shared
0.00
None
159.82K
ROCKET LAB CORP
SOLEShares2.59M
TypeSH
Market value$180.85M
0.75%
Sole
2.20M
Shared
0.00
None
394.79K
| Issuer | Class | Shares | Type | Value / Portfolio % | Voting — Sole | Shared | None |
|---|---|---|---|---|---|---|---|
NVIDIA CORPORATIONSOLE | COM | 5.95M | SH | $1.11B 4.62% | 4.28M | 0.00 | 1.67M |
ASCENDIS PHARMA A/SSOLE | SPONSORED ADR | 5.19M | SH | $1.11B 4.61% | 4.24M | 0.00 | 940.93K |
APPLE INCSOLE | COM | 3.27M | SH | $890.16M 3.71% | 2.44M | 0.00 | 838.36K |
MICROSOFT CORPSOLE | COM | 1.62M | SH | $784.05M 3.27% | 1.16M | 0.00 | 461.59K |
ALPHABET INCSOLE | CAP STK CL A | 2.18M | SH | $681.86M 2.84% | 1.52M | 0.00 | 653.62K |
COMFORT SYS USA INCSOLE | COM | 668.84K | SH | $624.22M 2.60% | 546.91K | 0.00 | 121.92K |
AMAZON COM INCSOLE | COM | 2.33M | SH | $537.99M 2.24% | 1.67M | 0.00 | 665.56K |
AXON ENTERPRISE INCSOLE | COM | 831.18K | SH | $472.05M 1.97% | 608.16K | 0.00 | 223.01K |
FTAI AVIATION LTDSOLE | SHS | 2.35M | SH | $462.72M 1.93% | 1.93M | 0.00 | 417.66K |
HOWMET AEROSPACE INCSOLE | COM | 2.22M | SH | $454.96M 1.90% | 1.55M | 0.00 | 664.71K |
META PLATFORMS INCSOLE | CL A | 655.28K | SH | $432.55M 1.80% | 471.35K | 0.00 | 183.93K |
BROADCOM INCSOLE | COM | 1.11M | SH | $384.97M 1.60% | 777.69K | 0.00 | 334.63K |
VERTIV HOLDINGS COSOLE | COM CL A | 2.28M | SH | $369.01M 1.54% | 1.79M | 0.00 | 487.31K |
ELI LILLY & COSOLE | COM | 277.55K | SH | $298.28M 1.24% | 201.52K | 0.00 | 76.03K |
TAPESTRY INCSOLE | COM | 2.10M | SH | $268.07M 1.12% | 1.74M | 0.00 | 356.26K |
REVOLUTION MEDICINES INCSOLE | COM | 2.85M | SH | $226.61M 0.94% | 2.54M | 0.00 | 304.80K |
SERVICENOW INCSOLE | COM | 1.48M | SH | $226.23M 0.94% | 1M | 0.00 | 473.81K |
LPL FINL HLDGS INCSOLE | COM | 625.56K | SH | $223.43M 0.93% | 524.25K | 0.00 | 101.31K |
VISA INCSOLE | COM CL A | 603.93K | SH | $211.80M 0.88% | 467.17K | 0.00 | 136.75K |
BANK AMERICA CORPSOLE | COM | 3.82M | SH | $210.30M 0.88% | 2.42M | 0.00 | 1.41M |
TESLA INCSOLE | COM | 461.68K | SH | $207.62M 0.86% | 312.72K | 0.00 | 148.96K |
MASIMO CORPSOLE | COM | 1.52M | SH | $197.96M 0.82% | 1.33M | 0.00 | 187.97K |
ARES MANAGEMENT CORPORATIONSOLE | CL A COM STK | 1.15M | SH | $186.07M 0.78% | 756.26K | 0.00 | 394.94K |
AMETEK INCSOLE | COM | 900.22K | SH | $184.82M 0.77% | 740.39K | 0.00 | 159.82K |
ROCKET LAB CORPSOLE | COM | 2.59M | SH | $180.85M 0.75% | 2.20M | 0.00 | 394.79K |
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