WESTFIELD CAPITAL MANAGEMENT CO LP
Institutional investor · Portfolio as of Q2 2026
Top Holdings278 positions
Stock | Shares | Value | Weight | Avg Buy | Est. P&L | Held | Conviction |
|---|---|---|---|---|---|---|---|
NVIDIA CORPORATION | 8.1M | $1.6B | 5.3% | $137.83 | +57.84% | 27 qtrssince 2019-Q4 | Increased 77 |
ALPHABET INC | 3.7M | $1.3B | 4.4% | $223.40 | +55.15% | 31 qtrssince 2018-Q4 | Increased 91 |
| 4.8M | $1.3B | 4.2% | $266.72 | -7.05% | 1 qtr | New 88 | |
AXON ENTERPRISE INC | 1.5M | $836.1M | 2.7% | $418.65 | +43.49% | 15 qtrssince 2022-Q4 | Increased 72 |
FTAI AVIATION LTD | 2.9M | $794.6M | 2.6% | $157.01 | +24.18% | 9 qtrssince 2024-Q2 | Increased 56 |
APPLE INC | 2.6M | $744.7M | 2.4% | $128.39 | +149.00% | 31 qtrssince 2018-Q4 | Decreased 0 |
COMFORT SYS USA INC | 355,433 | $704.5M | 2.3% | $302.63 | +401.85% | 11 qtrssince 2023-Q4 | Decreased 0 |
BROADCOM INC | 1.6M | $588M | 1.9% | $227.58 | +62.05% | 31 qtrssince 2018-Q4 | Increased 61 |
MICROSOFT CORP | 1.4M | $527.6M | 1.7% | $213.02 | +141.07% | 31 qtrssince 2018-Q4 | Decreased 0 |
HOWMET AEROSPACE INC | 1.9M | $516.6M | 1.7% | $161.25 | +64.25% | 6 qtrssince 2025-Q1 | Decreased 0 |
ELI LILLY & CO | 416,732 | $499.8M | 1.6% | $831.77 | +41.22% | 17 qtrssince 2022-Q2 | Increased 56 |
SNOWFLAKE INC | 1.7M | $441.9M | 1.4% | $239.30 | +37.07% | 5 qtrssince 2025-Q2 | Increased 79 |
MKS INC. | 928,617 | $413M | 1.3% | $162.07 | +57.81% | 4 qtrssince 2025-Q3 | Decreased 0 |
META PLATFORMS INC | 677,389 | $381.6M | 1.2% | $362.49 | +59.46% | 14 qtrssince 2023-Q1 | Increased 61 |
VERTIV HOLDINGS CO | 1.1M | $353M | 1.2% | $70.31 | +265.64% | 12 qtrssince 2023-Q3 | Decreased 0 |
GE VERNOVA INC | 241,272 | $283.5M | 0.9% | $481.88 | +89.24% | 8 qtrssince 2024-Q3 | Increased 52 |
MICRON TECHNOLOGY INC | 228,203 | $263.4M | 0.9% | $813.28 | +14.70% | 2 qtrssince 2026-Q1 | Increased 70 |
VISA INC | 762,403 | $261.6M | 0.9% | $235.98 | +61.71% | 31 qtrssince 2018-Q4 | Increased 64 |
API GROUP CORP | 6.2M | $260.6M | 0.9% | $39.70 | -0.03% | 3 qtrssince 2025-Q4 | Increased 56 |
TAPESTRY INC | 1.7M | $248.3M | 0.8% | $57.23 | +119.29% | 22 qtrssince 2021-Q1 | Decreased 0 |
WESTFIELD CAPITAL MANAGEMENT CO LP manages $30.6B across 278 positions as of Q2 2026. Top holdings: NVDA (5.3%), GOOGL (4.4%), ASND (4.2%). Fund DNA: Balanced Allocator. HoldingsIntel Score: 2/5.0.
Active quarter - 69 new positions, 41 exits, 98 increased. Top move: GOOGL (INCREASED, conviction 91). Portfolio: $30.6B across 278 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
Verify source filings on SEC EDGAR