WESTFIELD CAPITAL MANAGEMENT CO LP
Q2 2024 Form 13-F

BOSTON, MASSACHUSETTS
CIK 0001177719 · CRD 146990 · SEC-registered investment adviser
$20.4B Reported Value Total

WESTFIELD CAPITAL MANAGEMENT COMPANY, L.P. reports 794 total accounts under management (AUM). There are 794 discretionary accounts valued at $17,556,838,117, and 0 non-discretionary accounts.

Source: Form ADV filed * Note that certain holdings are exempt from Form 13-F reporting, so the AUM totals may be greater than the Form 13-F total.
SEC Registered Discretionary Manager
Firm Brochure (Part 2A) Client Relationship Summary (Form CRS)
Private funds (Form ADV)
11 funds · $185.4M gross asset value
Other: $68.8M · Hedge Fund: $34.8M · Private Equity Fund: $128.8K
Source: Form ADV filed 2026-07-01
Reported value
$20.4B
Quarter over quarter
-2.2%
Holdings
248
Top-10 concentration
29.0%

Filing Structure

Reports holdings for

Holdings reported by

Key People

Form ADV owners & control persons
William Albert Muggia
MEMBER OF MANAGEMENT COMMITTEE
Kathryn Ann Kearney
PARTNER, CHIEF FINANCIAL OFFICER AND CHIEF COMPLIANCE OFFICER
Richard Dailyong Lee
CHIEF INVESTMENT OFFICER
Q1 2024
Q3 2024
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Coverage begins with the second quarter of 2013. Earlier quarters are not shown while their accuracy is being verified.

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Q2 2024 13F filing summary

Period of report June 30, 2024
Filed August 14, 2024
Form 13F-HR
Reported value $20.4B
Positions 248
Change in reported value +6.9%
New positions 31
Exited positions 27
Position turnover 21.1%
Top-10 concentration 29.0%

13F filings by quarter

Quarter Positions Value
Q2 2026 13F
Filed Aug 12, 2026
 278 $30.6B
Q1 2026 13F
Filed May 11, 2026
 250 $23.8B
Q4 2025 13F
Filed Feb 11, 2026
 241 $24.0B
Q3 2025 13F
Filed Nov 12, 2025
 235 $23.8B
Q2 2025 13F
Filed Aug 12, 2025
 239 $23.8B
Q1 2025 13F
Filed May 9, 2025
 244 $20.5B
Q4 2024 13F
Filed Feb 11, 2025
 239 $23.0B
Q3 2024 13F
Filed Nov 12, 2024
 247 $22.1B
Q2 2024 13F
Filed Aug 14, 2024
 248 $20.4B
Q1 2024 13F
Filed May 10, 2024
 244 $19.0B
Q4 2023 13F
Filed Feb 9, 2024
 239 $17.2B
Q3 2023 13F
Filed Nov 13, 2023
 234 $14.7B
Q2 2023 13F
Filed Aug 11, 2023
 227 $15.7B
Q1 2023 13F
Filed May 12, 2023
 222 $14.2B
Q4 2022 13F
Filed Feb 13, 2023
 226 $13.0B
Q3 2022 13F
Filed Nov 14, 2022
 230 $12.6B
Q2 2022 13F
Filed Aug 12, 2022
 235 $12.7B
Q1 2022 13F
Filed May 16, 2022
 235 $15.6B
Q4 2021 13F
Filed Feb 10, 2022
 244 $16.8B
Q3 2021 13F
Filed Nov 12, 2021
 235 $16.6B

33 earlier quarters on file — choose one from the quarter menu above.

Top 20 holdings · Q2 2024

# Holding Reported value % of portfolio
1 NVDA NVIDIA CORPORATION $876.8M 4.31%
2 MSFT MICROSOFT CORP $825.4M 4.06%
3 AAPL APPLE INC $802.9M 3.94%
4 ASND ASCENDIS PHARMA A/S $676.8M 3.33%
5 AMZN AMAZON COM INC $633.8M 3.11%
6 GOOGL ALPHABET INC $564.8M 2.78%
7 TDG TRANSDIGM GROUP INC $464.3M 2.28%
8 META META PLATFORMS INC $434.4M 2.13%
9 VRT VERTIV HOLDINGS CO $309.1M 1.52%
10 AXON AXON ENTERPRISE INC $308.2M 1.51%
11 NOW SERVICENOW INC $281.8M 1.38%
12 FIX COMFORT SYS USA INC $263.0M 1.29%
13 V VISA INC $231.6M 1.14%
14 DXCM DEXCOM INC $222.8M 1.09%
15 LEGN LEGEND BIOTECH CORP $211.4M 1.04%
16 UBER UBER TECHNOLOGIES INC $205.5M 1.01%
17 PGR PROGRESSIVE CORP $189.9M 0.93%
18 WING WINGSTOP INC $184.5M 0.91%
19 TSM TAIWAN SEMICONDUCTOR MFG LTD $184.2M 0.91%
20 ABBV ABBVIE INC $172.4M 0.85%

Values as reported on the Q2 2024 Form 13F. Every position is in the holdings table below.

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