WESTFIELD CAPITAL MANAGEMENT CO LP
Institutional investor · Portfolio as of Q3 2025
Top Holdings235 positions
Stock | Shares | Value | Weight | Avg Buy | Est. P&L | Held | Conviction |
|---|---|---|---|---|---|---|---|
NVIDIA CORP | 6.5M | $1.2B | 5.1% | $116.79 | +55.70% | 24 qtrssince 2019-Q4 | Decreased 0 |
ASCENDIS PHARMA A/S | 5.3M | $1B | 4.4% | $119.23 | +60.69% | 28 qtrssince 2018-Q4 | Decreased 0 |
MICROSOFT CORP | 1.7M | $883.2M | 3.7% | $211.16 | +143.25% | 28 qtrssince 2018-Q4 | Decreased 0 |
APPLE INC | 3.3M | $849.1M | 3.6% | $128.39 | +97.59% | 28 qtrssince 2018-Q4 | Decreased 0 |
COMFORT SYSTEMS USA INC | 833,195 | $687.5M | 2.9% | $302.63 | +172.11% | 8 qtrssince 2023-Q4 | Decreased 0 |
META PLATFORMS INC-CLASS A | 767,657 | $563.8M | 2.4% | $305.10 | +143.46% | 11 qtrssince 2023-Q1 | Decreased 0 |
AMAZON.COM INC | 2.5M | $558.1M | 2.3% | $137.14 | +62.00% | 28 qtrssince 2018-Q4 | Decreased 0 |
ALPHABET INC-CL A | 2.2M | $545.7M | 2.3% | $109.55 | +122.64% | 28 qtrssince 2018-Q4 | Decreased 0 |
AXON ENTERPRISE INC | 729,152 | $523.3M | 2.2% | $312.64 | +129.54% | 12 qtrssince 2022-Q4 | Decreased 0 |
HOWMET AEROSPACE INC | 2M | $393.9M | 1.7% | $154.24 | +26.96% | 3 qtrssince 2025-Q1 | Increased 51 |
BROADCOM INC | 1.2M | $384.8M | 1.6% | $175.32 | +87.13% | 28 qtrssince 2018-Q4 | Decreased 0 |
FTAI AVIATION LTD | 2.1M | $355.5M | 1.5% | $127.96 | +29.40% | 6 qtrssince 2024-Q2 | Increased 54 |
VERTIV HOLDINGS CO-A | 2.2M | $339M | 1.4% | $69.03 | +107.52% | 9 qtrssince 2023-Q3 | Decreased 0 |
TRANSDIGM GROUP INC | 217,897 | $287.2M | 1.2% | $506.55 | +154.52% | 28 qtrssince 2018-Q4 | Decreased 0 |
TAPESTRY INC | 2.5M | $277.5M | 1.2% | $52.56 | +111.33% | 19 qtrssince 2021-Q1 | Decreased 0 |
NETFLIX INC | 230,648 | $276.5M | 1.2% | $81.25 | +48.48% | 5 qtrssince 2024-Q3 | Decreased 0 |
SEMTECH CORP | 3.4M | $241.5M | 1.0% | $44.25 | +40.07% | 3 qtrssince 2025-Q1 | Increased 59 |
VISA INC-CLASS A SHARES | 705,767 | $240.9M | 1.0% | $164.65 | +105.69% | 28 qtrssince 2018-Q4 | Decreased 0 |
SERVICENOW INC | 260,002 | $239.3M | 1.0% | $67.62 | +178.26% | 28 qtrssince 2018-Q4 | Decreased 0 |
MARVELL TECHNOLOGY INC | 2.6M | $219.6M | 0.9% | $82.28 | 0.00% | 1 qtr | New 60 |
WESTFIELD CAPITAL MANAGEMENT CO LP manages $23.8B across 235 positions as of Q3 2025. Top holdings: NVDA (5.1%), ASND (4.4%), MSFT (3.7%). Fund DNA: Balanced Allocator. HoldingsIntel Rating: 3/5.0.
Active quarter - 43 new positions, 47 exits, 80 increased. Top move: MRVL (NEW, conviction 60). Portfolio: $23.8B across 235 positions.
Top holdings by portfolio weight
Portfolio allocation by GICS sector
Behavioral investing profile
Position Outcomes
Best and worst performing positions by estimated return
Top Winners
Top Losers
Cost basis estimates based on full filing history using quarter-end prices. Actual transaction prices are not disclosed in 13F filings.
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Data sourced from SEC EDGAR 13F filings. Not financial advice. Full disclaimer