WESTFIELD CAPITAL MANAGEMENT CO LP

PrivateCIK: 1177719

Location

BOSTON, MA

278

Positions

$30.61B

Total AUM (reported)

236.91M

Total Shares

Allocation by class

COM$19.19B62.7%

CL A$1.46B4.8%

ORD SHS$1.43B4.7%

COM CL A$1.36B4.4%

CAP STK CL A$1.34B4.4%

SHS$1.18B3.8%

COM SHS$1.16B3.8%

Portfolio Concentration

Top 3$4.24B13.8%

4–10$4.71B15.4%

11–25$4.62B15.1%

Rest$17.04B55.7%

Top 3 weight

13.8%

Top 10 weight

29.2%

Voting Authority Distribution

Total shares with voting rights: 236.91M

Sole

Full voting authority

208.87M

% of voting shares88.2%

Shared

Joint voting authority

0.00

% of voting shares0.0%

None

No voting authority

28.03M

% of voting shares11.8%

Investment Discretion (by position count)

Sole278

Shared0

Other0

Dominant voting typeSole · 88.2% of voting shares

Institutional Holdings278

Rows:

NVIDIA CORPORATION

SOLE

COM

Shares8.08M

TypeSH

Market value$1.62B

5.28%

Sole

6.43M

Shared

0.00

None

1.65M

ALPHABET INC

SOLE

CAP STK CL A

Shares3.75M

TypeSH

Market value$1.34B

4.38%

Sole

3.12M

Shared

0.00

None

630.58K

ASCENDIS PHARMA A/S

SOLE

ORD SHS

Shares4.80M

TypeSH

Market value$1.28B

4.18%

Sole

4.03M

Shared

0.00

None

766.96K

AXON ENTERPRISE INC

SOLE

COM

Shares1.49M

TypeSH

Market value$836.14M

2.73%

Sole

1.19M

Shared

0.00

None

301.50K

FTAI AVIATION LTD

SOLE

SHS

Shares2.94M

TypeSH

Market value$794.61M

2.60%

Sole

2.54M

Shared

0.00

None

395.39K

APPLE INC

SOLE

COM

Shares2.57M

TypeSH

Market value$744.75M

2.43%

Sole

1.96M

Shared

0.00

None

613.46K

COMFORT SYS USA INC

SOLE

COM

Shares355.43K

TypeSH

Market value$704.45M

2.30%

Sole

287.83K

Shared

0.00

None

67.60K

BROADCOM INC

SOLE

COM

Shares1.56M

TypeSH

Market value$587.98M

1.92%

Sole

1.23M

Shared

0.00

None

326.80K

MICROSOFT CORP

SOLE

COM

Shares1.41M

TypeSH

Market value$527.56M

1.72%

Sole

1.07M

Shared

0.00

None

343.33K

HOWMET AEROSPACE INC

SOLE

COM

Shares1.92M

TypeSH

Market value$516.61M

1.69%

Sole

1.43M

Shared

0.00

None

496.11K

ELI LILLY & CO

SOLE

COM

Shares416.73K

TypeSH

Market value$499.84M

1.63%

Sole

328.22K

Shared

0.00

None

88.51K

SNOWFLAKE INC

SOLE

COM SHS

Shares1.74M

TypeSH

Market value$441.94M

1.44%

Sole

1.31M

Shared

0.00

None

423.78K

MKS INC.

SOLE

COM

Shares928.62K

TypeSH

Market value$413.05M

1.35%

Sole

792.79K

Shared

0.00

None

135.83K

META PLATFORMS INC

SOLE

CL A

Shares677.39K

TypeSH

Market value$381.57M

1.25%

Sole

536.19K

Shared

0.00

None

141.19K

VERTIV HOLDINGS CO

SOLE

COM CL A

Shares1.05M

TypeSH

Market value$353.02M

1.15%

Sole

838.10K

Shared

0.00

None

216.26K

GE VERNOVA INC

SOLE

COM

Shares241.27K

TypeSH

Market value$283.46M

0.93%

Sole

169.56K

Shared

0.00

None

71.71K

MICRON TECHNOLOGY INC

SOLE

COM

Shares228.20K

TypeSH

Market value$263.41M

0.86%

Sole

186.40K

Shared

0.00

None

41.80K

VISA INC

SOLE

COM CL A

Shares762.40K

TypeSH

Market value$261.57M

0.85%

Sole

593.21K

Shared

0.00

None

169.19K

API GROUP CORP

SOLE

COM STK

Shares6.15M

TypeSH

Market value$260.63M

0.85%

Sole

5.18M

Shared

0.00

None

970.39K

TAPESTRY INC

SOLE

COM

Shares1.70M

TypeSH

Market value$248.34M

0.81%

Sole

1.46M

Shared

0.00

None

232.79K

RHYTHM PHARMACEUTICALS INC

SOLE

COM

Shares2.21M

TypeSH

Market value$245.22M

0.80%

Sole

2.04M

Shared

0.00

None

169.87K

LIFE TIME GROUP HOLDINGS INC

SOLE

COMMON STOCK

Shares6M

TypeSH

Market value$244.85M

0.80%

Sole

5.61M

Shared

0.00

None

388.15K

TAIWAN SEMICONDUCTOR MANUFAC

SOLE

GUARDANT HEALTH INC

SOLE

COM

Shares1.62M

TypeSH

Market value$243.72M

0.80%

Sole

1.50M

Shared

0.00

None

124.61K

QUANTA SVCS INC

SOLE

COM

Shares331.49K

TypeSH

Market value$238.69M

0.78%

Sole

242K

Shared

0.00

None

89.49K

Issuer	Class	Shares	Type	Value / Portfolio %	Voting — Sole	None
NVIDIA CORPORATIONSOLE	COM	8.08M	SH	$1.62B 5.28%	6.43M	1.65M
ALPHABET INCSOLE	CAP STK CL A	3.75M	SH	$1.34B 4.38%	3.12M	630.58K
ASCENDIS PHARMA A/SSOLE	ORD SHS	4.80M	SH	$1.28B 4.18%	4.03M	766.96K
AXON ENTERPRISE INCSOLE	COM	1.49M	SH	$836.14M 2.73%	1.19M	301.50K
FTAI AVIATION LTDSOLE	SHS	2.94M	SH	$794.61M 2.60%	2.54M	395.39K
APPLE INCSOLE	COM	2.57M	SH	$744.75M 2.43%	1.96M	613.46K
COMFORT SYS USA INCSOLE	COM	355.43K	SH	$704.45M 2.30%	287.83K	67.60K
BROADCOM INCSOLE	COM	1.56M	SH	$587.98M 1.92%	1.23M	326.80K
MICROSOFT CORPSOLE	COM	1.41M	SH	$527.56M 1.72%	1.07M	343.33K
HOWMET AEROSPACE INCSOLE	COM	1.92M	SH	$516.61M 1.69%	1.43M	496.11K
ELI LILLY & COSOLE	COM	416.73K	SH	$499.84M 1.63%	328.22K	88.51K
SNOWFLAKE INCSOLE	COM SHS	1.74M	SH	$441.94M 1.44%	1.31M	423.78K
MKS INC.SOLE	COM	928.62K	SH	$413.05M 1.35%	792.79K	135.83K
META PLATFORMS INCSOLE	CL A	677.39K	SH	$381.57M 1.25%	536.19K	141.19K
VERTIV HOLDINGS COSOLE	COM CL A	1.05M	SH	$353.02M 1.15%	838.10K	216.26K
GE VERNOVA INCSOLE	COM	241.27K	SH	$283.46M 0.93%	169.56K	71.71K
MICRON TECHNOLOGY INCSOLE	COM	228.20K	SH	$263.41M 0.86%	186.40K	41.80K
VISA INCSOLE	COM CL A	762.40K	SH	$261.57M 0.85%	593.21K	169.19K
API GROUP CORPSOLE	COM STK	6.15M	SH	$260.63M 0.85%	5.18M	970.39K
TAPESTRY INCSOLE	COM	1.70M	SH	$248.34M 0.81%	1.46M	232.79K
RHYTHM PHARMACEUTICALS INCSOLE	COM	2.21M	SH	$245.22M 0.80%	2.04M	169.87K
LIFE TIME GROUP HOLDINGS INCSOLE	COMMON STOCK	6M	SH	$244.85M 0.80%	5.61M	388.15K
TAIWAN SEMICONDUCTOR MANUFACSOLE	SPONSORED ADS	511K	SH	$244.04M 0.80%	364.12K	146.88K
GUARDANT HEALTH INCSOLE	COM	1.62M	SH	$243.72M 0.80%	1.50M	124.61K
QUANTA SVCS INCSOLE	COM	331.49K	SH	$238.69M 0.78%	242K	89.49K

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