WESTFIELD CAPITAL MANAGEMENT CO LP
Top Portfolio Positions
243 positions ·
$23,810,970,015 total
· as of Mar 31, 2026
| Ticker | Company | Shares | Value (USD) | % of Portfolio | Open |
|---|---|---|---|---|---|
| NVDA |
Nvidia Corp
Technology
|
6,317,039 | $1,101,691,601 | 4.63% | |
| ASND |
Ascendis Pharma A/S
Healthcare
|
4,813,440 | $1,100,978,131 | 4.62% | |
| FIX |
Comfort Systems USA Inc
Industrials
|
620,915 | $856,235,575 | 3.60% | |
| AAPL |
Apple Inc.
Technology
|
3,133,113 | $795,152,748 | 3.34% | |
| FTAI |
FTAI Aviation Ltd.
Industrials
|
2,848,227 | $697,815,615 | 2.93% | |
| MSFT |
Microsoft Corp
Technology
|
1,649,513 | $610,600,227 | 2.56% | |
| GOOGL |
Alphabet Inc.
Communication Services
|
2,026,744 | $582,810,504 | 2.45% | |
| HWM |
Howmet Aerospace Inc.
Industrials
|
2,289,697 | $527,683,570 | 2.22% | |
| VRT |
Vertiv Holdings Co
Industrials
|
1,921,696 | $481,538,583 | 2.02% | |
| AMZN |
Amazon Com Inc
Consumer Cyclical
|
2,279,654 | $474,783,538 | 1.99% |
Portfolio Trend
25 quarters · across all stocks
Holdings in MKSI
Shares Held
Position Value (USD)
17 quarters on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $240,556,605 | 1,046,763 | Shares | Sole | 2026-05-11 | |
| 2025-12-31 | $134,195,725 | 839,773 | Shares | Sole | 2026-02-11 | |
| 2025-09-30 | $40,022,762 | 323,364 | Shares | Sole | 2025-11-12 | |
| 2024-09-30 | $2,619,911 | 24,100 | Shares | Sole | 2024-11-12 | |
| 2024-06-30 | $3,146,978 | 24,100 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $82,468,379 | 620,063 | Shares | Sole | 2024-05-10 | |
| 2023-12-31 | $60,663,982 | 589,715 | Shares | Sole | 2024-02-09 | |
| 2022-09-30 | $63,504,460 | 768,447 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $72,575,830 | 707,160 | Shares | Sole | 2022-08-12 | |
| 2022-03-31 | $86,496,450 | 576,643 | Shares | Sole | 2022-05-16 | |
| 2021-09-30 | $83,599,914 | 553,972 | Shares | Sole | 2021-11-12 | |
| 2021-06-30 | $63,706,633 | 358,003 | Shares | Sole | 2021-08-10 | |
| 2021-03-31 | $60,160,816 | 324,457 | Shares | Sole | 2021-05-14 | |
| 2020-12-31 | $49,456,676 | 328,725 | Shares | Sole | 2021-02-12 | |
| 2020-09-30 | $31,785,493 | 290,996 | Shares | Sole | 2020-11-13 | |
| 2020-06-30 | $23,172,867 | 204,635 | Shares | Sole | 2020-08-13 | |
| 2020-03-31 | $20,768,935 | 254,990 | Shares | Sole | 2020-05-14 | |
| No 13F history on record for this holder in this stock. | ||||||