13F value (AUM)
$30.6B
Westfield Capital Management Co
WESTFIELD CAPITAL MANAGEMENT CO LP
$30.6B
13F long value · 2026-Q2Positions278
CategoryAsset Manager
Quarters tracked8
● #260 of 581 by 13F value
Size rank 6/10
51 NEW33 ADD17 2×+31 TRIM9 NEAR EXIT21 EXIT
Snapshot
Westfield Capital Management Co's 13F portfolio at a glance — size, concentration and this quarter's activity.
Positions
278 (23 unmapped)
Top 100 weight
79.8%
Quarters tracked
8
Latest 13F filed
Aug 12, 2026
New positions
51
Exits / near-exits
30
13F value by quarter
Total reported long value each quarter — fund flows plus market moves.
Top holdings — 2026-Q2
The fund's largest reported positions. The 100 shown cover 79.8% of the portfolio.
| Ticker | Issuer | Weight | Value | Shares | Since 2026-Q2 |
|---|---|---|---|---|---|
| NVDA | NVIDIA CORPORATION | 5.3% | $1.6B | 8.1M | +18.8% |
| GOOGL | ALPHABET INC | 4.4% | $1.3B | 3.7M | -3.6% |
| — | ASCENDIS PHARMA A/S | 4.2% | $1.3B | 4.8M | — |
| AXON | AXON ENTERPRISE INC | 2.7% | $836.1M | 1.5M | -28.2% |
| — | FTAI AVIATION LTD | 2.6% | $794.6M | 2.9M | — |
| AAPL | APPLE INC | 2.4% | $744.7M | 2.6M | +14.9% |
| FIX | COMFORT SYS USA INC | 2.3% | $704.5M | 355.4K | -9.5% |
| AVGO | BROADCOM INC | 1.9% | $588.0M | 1.6M | -6.5% |
| MSFT | MICROSOFT CORP | 1.7% | $527.6M | 1.4M | +38.7% |
| HWM | HOWMET AEROSPACE INC | 1.7% | $516.6M | 1.9M | -10.1% |
| LLY | ELI LILLY & CO | 1.6% | $499.8M | 416.7K | -27.6% |
| SNOW | SNOWFLAKE INC | 1.4% | $441.9M | 1.7M | -43.3% |
| MKSI | MKS INC. | 1.3% | $413.0M | 928.6K | -37.4% |
| META | META PLATFORMS INC | 1.2% | $381.6M | 677.4K | +30.0% |
| VRT | VERTIV HOLDINGS CO | 1.2% | $353.0M | 1.1M | -3.7% |
Quarterly changes — 2026-Q2
What Westfield Capital Management Co opened, added, trimmed and exited this quarter, largest dollar moves first.
| Action | Ticker | Issuer | Prev shares | Curr shares | Change | Value Δ |
|---|---|---|---|---|---|---|
| NEW | — | ASCENDIS PHARMA A/S | — | 4.8M | — | +$1.3B |
| EXIT | — | ASCENDIS PHARMA A/S | 4.8M | 0 | -100.0% | -$1.1B |
| ADD | GOOGL | ALPHABET INC | 2.0M | 3.7M | +85.0% | +$757.0M |
| ADD | NVDA | NVIDIA CORPORATION | 6.3M | 8.1M | +27.9% | +$515.0M |
| ADD | AXON | AXON ENTERPRISE INC | 1.1M | 1.5M | +40.2% | +$384.2M |
| 2×+ | SNOW | SNOWFLAKE INC | 718.8K | 1.7M | +141.6% | +$333.5M |
| TRIM | AMZN | AMAZON COM INC | 2.3M | 859.8K | -62.3% | -$269.9M |
| 2×+ | AMD | ADVANCED MICRO DEVICES INC | 5.0K | 403.1K | +7929.5% | +$233.1M |
| 2×+ | MU | MICRON TECHNOLOGY INC | 100.4K | 228.2K | +127.2% | +$229.5M |
| ADD | AVGO | BROADCOM INC | 1.2M | 1.6M | +25.8% | +$205.1M |
Conviction over time
Portfolio weight of the current top long holdings, quarter by quarter — rising weight = growing conviction.