Largest positions
| Issuer | Class | Value | Share |
|---|---|---|---|
| Nvidia CorporationCOM | COM | $1,616,712,338 | 5.3% |
| Alphabet Inc.CAP STK CL A | CAP STK CL A | $1,339,806,415 | 4.4% |
| Ascendis Pharma A/sORD SHS | ORD SHS | $1,279,793,795 | 4.2% |
| Axon Enterprise Inc.COM | COM | $836,144,444 | 2.7% |
| Ftai Aviation LtdSHS | SHS | $794,608,199 | 2.6% |
| Apple Inc.COM | COM | $744,747,287 | 2.4% |
| Comfort Sys USA Inc.COM | COM | $704,451,409 | 2.3% |
| Broadcom Inc.COM | COM | $587,976,343 | 1.9% |
| Microsoft Corp.COM | COM | $527,559,770 | 1.7% |
| Howmet Aerospace Inc.COM | COM | $516,608,027 | 1.7% |
| Eli Lilly & COCOM | COM | $499,840,862 | 1.6% |
| Snowflake Inc.COM SHS | COM SHS | $441,938,647 | 1.4% |
| Mks Inc..COM | COM | $413,048,645 | 1.3% |
| Meta Platforms Inc.CL A | CL A | $381,566,445 | 1.2% |
| Vertiv Holdings COCOM CL A | COM CL A | $353,021,161 | 1.2% |
| GE Vernova Inc.COM | COM | $283,461,275 | 0.9% |
| Micron Technology Inc.COM | COM | $263,412,188 | 0.9% |
| Visa Inc.COM CL A | COM CL A | $261,572,839 | 0.9% |
| Api Group Corp.COM STK | COM STK | $260,634,647 | 0.9% |
| Tapestry Inc.COM | COM | $248,343,835 | 0.8% |
| Rhythm Pharmaceuticals Inc.COM | COM | $245,220,303 | 0.8% |
| Life Time Group Holdings Inc.COMMON STOCK | COMMON STOCK | $244,846,173 | 0.8% |
| Taiwan Semiconductor ManufacSPONSORED ADS | SPONSORED ADS | $244,037,920 | 0.8% |
| Guardant Health Inc.COM | COM | $243,717,584 | 0.8% |
| Quanta Svcs Inc.COM | COM | $238,685,542 | 0.8% |
| Servicenow Inc.COM | COM | $235,661,989 | 0.8% |
| Advanced Micro Devices Inc.COM | COM | $234,153,542 | 0.8% |
| Palo Alto Networks Inc.COM | COM | $224,504,060 | 0.7% |
| Woodward Inc.COM | COM | $223,996,287 | 0.7% |
| Arista Networks Inc.COM SHS | COM SHS | $223,748,310 | 0.7% |
| Lpl Finl Hldgs Inc.COM | COM | $223,389,290 | 0.7% |
| Rocket Lab Corp.COM | COM | $214,888,621 | 0.7% |
| Amer Sports Inc.COM SHS | COM SHS | $214,712,179 | 0.7% |
| Cloudflare Inc.CL A COM | CL A COM | $204,931,901 | 0.7% |
| Amazon Com Inc.COM | COM | $204,926,241 | 0.7% |
| Garmin LtdSHS | SHS | $204,535,458 | 0.7% |
| Regal Rexnord CorporationCOM | COM | $204,123,113 | 0.7% |
| Natera Inc.COM | COM | $197,243,187 | 0.6% |
| Morgan StanleyCOM NEW | COM NEW | $196,614,709 | 0.6% |
| Carpenter Technology Corp.COM | COM | $193,738,341 | 0.6% |
| Samsara Inc.COM CL A | COM CL A | $189,276,373 | 0.6% |
| Dynatrace Inc.COM NEW | COM NEW | $186,583,645 | 0.6% |
| Caterpillar Inc.COM | COM | $185,952,922 | 0.6% |
| Semtech Corp.COM | COM | $183,419,455 | 0.6% |
| Ametek Inc.COM | COM | $175,115,699 | 0.6% |
| Abivax SASPONSORED ADS | SPONSORED ADS | $174,547,280 | 0.6% |
| Insmed Inc.COM PAR $.01 | COM PAR $.01 | $173,743,795 | 0.6% |
| Itt Inc.COM | COM | $164,216,344 | 0.5% |
| Gilead Sciences Inc.COM | COM | $162,679,071 | 0.5% |
| Ptc Therapeutics Inc.COM | COM | $159,563,645 | 0.5% |
Nvidia CorporationCOM$1,616,712,338
- Class
- COM
- Share
- 5.3%
Alphabet Inc.CAP STK CL A$1,339,806,415
- Class
- CAP STK CL A
- Share
- 4.4%
Ascendis Pharma A/sORD SHS$1,279,793,795
- Class
- ORD SHS
- Share
- 4.2%
Axon Enterprise Inc.COM$836,144,444
- Class
- COM
- Share
- 2.7%
Ftai Aviation LtdSHS$794,608,199
- Class
- SHS
- Share
- 2.6%
Apple Inc.COM$744,747,287
- Class
- COM
- Share
- 2.4%
Comfort Sys USA Inc.COM$704,451,409
- Class
- COM
- Share
- 2.3%
Broadcom Inc.COM$587,976,343
- Class
- COM
- Share
- 1.9%
Microsoft Corp.COM$527,559,770
- Class
- COM
- Share
- 1.7%
Howmet Aerospace Inc.COM$516,608,027
- Class
- COM
- Share
- 1.7%
Eli Lilly & COCOM$499,840,862
- Class
- COM
- Share
- 1.6%
Snowflake Inc.COM SHS$441,938,647
- Class
- COM SHS
- Share
- 1.4%
Mks Inc..COM$413,048,645
- Class
- COM
- Share
- 1.3%
Meta Platforms Inc.CL A$381,566,445
- Class
- CL A
- Share
- 1.2%
Vertiv Holdings COCOM CL A$353,021,161
- Class
- COM CL A
- Share
- 1.2%
GE Vernova Inc.COM$283,461,275
- Class
- COM
- Share
- 0.9%
Micron Technology Inc.COM$263,412,188
- Class
- COM
- Share
- 0.9%
Visa Inc.COM CL A$261,572,839
- Class
- COM CL A
- Share
- 0.9%
Api Group Corp.COM STK$260,634,647
- Class
- COM STK
- Share
- 0.9%
Tapestry Inc.COM$248,343,835
- Class
- COM
- Share
- 0.8%
Rhythm Pharmaceuticals Inc.COM$245,220,303
- Class
- COM
- Share
- 0.8%
Life Time Group Holdings Inc.COMMON STOCK$244,846,173
- Class
- COMMON STOCK
- Share
- 0.8%
Taiwan Semiconductor ManufacSPONSORED ADS$244,037,920
- Class
- SPONSORED ADS
- Share
- 0.8%
Guardant Health Inc.COM$243,717,584
- Class
- COM
- Share
- 0.8%
Quanta Svcs Inc.COM$238,685,542
- Class
- COM
- Share
- 0.8%
Servicenow Inc.COM$235,661,989
- Class
- COM
- Share
- 0.8%
Advanced Micro Devices Inc.COM$234,153,542
- Class
- COM
- Share
- 0.8%
Palo Alto Networks Inc.COM$224,504,060
- Class
- COM
- Share
- 0.7%
Woodward Inc.COM$223,996,287
- Class
- COM
- Share
- 0.7%
Arista Networks Inc.COM SHS$223,748,310
- Class
- COM SHS
- Share
- 0.7%
Lpl Finl Hldgs Inc.COM$223,389,290
- Class
- COM
- Share
- 0.7%
Rocket Lab Corp.COM$214,888,621
- Class
- COM
- Share
- 0.7%
Amer Sports Inc.COM SHS$214,712,179
- Class
- COM SHS
- Share
- 0.7%
Cloudflare Inc.CL A COM$204,931,901
- Class
- CL A COM
- Share
- 0.7%
Amazon Com Inc.COM$204,926,241
- Class
- COM
- Share
- 0.7%
Garmin LtdSHS$204,535,458
- Class
- SHS
- Share
- 0.7%
Regal Rexnord CorporationCOM$204,123,113
- Class
- COM
- Share
- 0.7%
Natera Inc.COM$197,243,187
- Class
- COM
- Share
- 0.6%
Morgan StanleyCOM NEW$196,614,709
- Class
- COM NEW
- Share
- 0.6%
Carpenter Technology Corp.COM$193,738,341
- Class
- COM
- Share
- 0.6%
Samsara Inc.COM CL A$189,276,373
- Class
- COM CL A
- Share
- 0.6%
Dynatrace Inc.COM NEW$186,583,645
- Class
- COM NEW
- Share
- 0.6%
Caterpillar Inc.COM$185,952,922
- Class
- COM
- Share
- 0.6%
Semtech Corp.COM$183,419,455
- Class
- COM
- Share
- 0.6%
Ametek Inc.COM$175,115,699
- Class
- COM
- Share
- 0.6%
Abivax SASPONSORED ADS$174,547,280
- Class
- SPONSORED ADS
- Share
- 0.6%
Insmed Inc.COM PAR $.01$173,743,795
- Class
- COM PAR $.01
- Share
- 0.6%
Itt Inc.COM$164,216,344
- Class
- COM
- Share
- 0.5%
Gilead Sciences Inc.COM$162,679,071
- Class
- COM
- Share
- 0.5%
Ptc Therapeutics Inc.COM$159,563,645
- Class
- COM
- Share
- 0.5%
The share class is shown on a wider screen.
The 50 largest of 278 positions by value, with holdings of the same security combined. The 200 largest are in this firm's machine-readable record. Share counts and quarter-on-quarter changes for each position are on EDGAR. View the full information table on EDGAR
This filing
- Form
- 13F-HR
- CIK
- 1177719
- File number
- 028-10220
- Options
- 0 call, 0 put
- In the 25 largest
- 44.3%
- Prior quarter
- $23,834,799,485 at 31 March 2026
- Positions opened
- 69
- Positions closed
- 41
Common questions
What are Westfield Capital Management’s 13F holdings worth?
$30,614,527,190 across 278 positions for the quarter ended 30 June 2026.
What is Westfield Capital Management’s largest 13F holding?
NVIDIA CORPORATION (COM) was the largest position at $1,616,712,338, or 5.3% of reported 13F value, as of 30 June 2026.
How concentrated is Westfield Capital Management’s 13F portfolio?
The ten largest positions accounted for 29.2% of reported value and the twenty-five largest for 44.3%, across 278 positions as of 30 June 2026.
Does Form 13F show everything Westfield Capital Management manages?
No. Form 13F covers only long positions in exchange-traded securities over which the manager has investment discretion, valued at quarter end. It excludes cash, most bonds, private funds, and any assets the firm does not have discretion over, so it is neither the firm's total assets nor any individual client's portfolio.
How often does Westfield Capital Management file its 13F?
Every quarter. Managers file within 45 days of each quarter's end, so the figures are a snapshot that changes between filings. This page shows the quarter ended 30 June 2026.
Answered from this filing and the prior quarter's.