WESTFIELD CAPITAL MANAGEMENT CO LP
Institutional investor · Portfolio as of Q4 2025
Top Holdings241 positions
Stock | Shares | Value | Weight | Avg Buy | Est. P&L | Held | Conviction |
|---|---|---|---|---|---|---|---|
NVIDIA CORP | 6M | $1.1B | 4.6% | $116.79 | +60.59% | 25 qtrssince 2019-Q4 | Decreased 0 |
ASCENDIS PHARMA A/S | 5.2M | $1.1B | 4.6% | $119.23 | +75.57% | 29 qtrssince 2018-Q4 | Decreased 0 |
APPLE INC | 3.3M | $890.2M | 3.7% | $128.39 | +111.17% | 29 qtrssince 2018-Q4 | Decreased 0 |
MICROSOFT CORP | 1.6M | $784.1M | 3.3% | $211.16 | +130.86% | 29 qtrssince 2018-Q4 | Decreased 0 |
ALPHABET INC-CL A | 2.2M | $681.9M | 2.8% | $109.55 | +186.50% | 29 qtrssince 2018-Q4 | Decreased 0 |
COMFORT SYSTEMS USA INC | 668,835 | $624.2M | 2.6% | $302.63 | +207.95% | 9 qtrssince 2023-Q4 | Decreased 0 |
AMAZON.COM INC | 2.3M | $538M | 2.2% | $137.14 | +69.56% | 29 qtrssince 2018-Q4 | Decreased 0 |
AXON ENTERPRISE INC | 831,177 | $472.1M | 2.0% | $346.08 | +65.31% | 13 qtrssince 2022-Q4 | Increased 56 |
FTAI AVIATION LTD | 2.4M | $462.7M | 1.9% | $134.31 | +45.74% | 7 qtrssince 2024-Q2 | Increased 54 |
HOWMET AEROSPACE INC | 2.2M | $455M | 1.9% | $159.05 | +28.71% | 4 qtrssince 2025-Q1 | Increased 54 |
META PLATFORMS INC-CLASS A | 655,283 | $432.5M | 1.8% | $305.10 | +118.27% | 12 qtrssince 2023-Q1 | Decreased 0 |
BROADCOM INC | 1.1M | $385M | 1.6% | $176.64 | +98.06% | 29 qtrssince 2018-Q4 | Decreased 0 |
VERTIV HOLDINGS CO-A | 2.3M | $369M | 1.5% | $70.31 | +133.74% | 10 qtrssince 2023-Q3 | Increased 50 |
ELI LILLY & CO | 277,549 | $298.3M | 1.2% | $736.31 | +45.25% | 15 qtrssince 2022-Q2 | Increased 49 |
TAPESTRY INC | 2.1M | $268.1M | 1.1% | $52.56 | +146.45% | 20 qtrssince 2021-Q1 | Decreased 0 |
REVOLUTION MEDICINES INC | 2.8M | $226.6M | 0.9% | $44.85 | +77.65% | 5 qtrssince 2024-Q4 | Increased 49 |
SERVICENOW INC | 1.5M | $226.2M | 0.9% | $138.98 | +10.97% | 29 qtrssince 2018-Q4 | Increased 70 |
LPL FINANCIAL HOLDINGS INC | 625,562 | $223.4M | 0.9% | $212.01 | +67.99% | 29 qtrssince 2018-Q4 | Increased 47 |
VISA INC-CLASS A SHARES | 603,926 | $211.8M | 0.9% | $164.65 | +111.73% | 29 qtrssince 2018-Q4 | Decreased 0 |
BANK OF AMERICA CORP | 3.8M | $210.3M | 0.9% | $40.63 | +36.06% | 13 qtrssince 2022-Q4 | Decreased 0 |
WESTFIELD CAPITAL MANAGEMENT CO LP manages $24B across 241 positions as of Q4 2025. Top holdings: NVDA (4.6%), ASND (4.6%), AAPL (3.7%). Fund DNA: Balanced Allocator. HoldingsIntel Rating: 2.5/5.0.
Active quarter - 39 new positions, 33 exits, 118 increased. Top move: NOW (INCREASED, conviction 70). Portfolio: $24.0B across 241 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