Westfield Capital Management Co LP reported 268 positions worth $30.38B for the quarter ended Jun 30, 2026, up 29.1% on the prior quarter. It opened 63 new positions, added to 96, trimmed 102 and exited 35. Its largest holding is Nvidia Corp at 5.3% of the portfolio.
Reported 13F market value at each quarter end. A change mixes trading with price moves in the positions held.
Dollar value of shares bought and sold each quarter, at that quarter’s price. It counts trading only, not price changes.
How many positions were opened, added to, trimmed or closed each quarter.
Share of reported value in each sector at every quarter end.
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| GOOGL Alphabet Inc. | +1.72M | +85.0% | $615.51M | 4.41% |
| NVDA Nvidia Corp | +1.76M | +27.9% | $352.74M | 5.32% |
| SNOW Snowflake Inc. | +1.02M | +141.6% | $259.00M | 1.45% |
| AXON Axon Enterprise, Inc. | +427.4K | +40.2% | $239.58M | 2.75% |
| AMD Advanced Micro Devices Inc | +398.1K | +7,929.5% | $231.24M | 0.771% |
| CRS Carpenter Technology Corp | +314.1K | – | $193.74M | 0.638% |
| PTCT Ptc Therapeutics, Inc. | +1.96M | – | $159.56M | 0.525% |
| GILD Gilead Sciences, Inc. | +1.26M | +4,724.4% | $159.31M | 0.536% |
| CAT Caterpillar Inc | +142.3K | +440.2% | $151.53M | 0.612% |
| AMAT Applied Materials Inc | +204.7K | +21,865.0% | $147.97M | 0.489% |
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| FIX Comfort Systems Usa Inc | -265.5K | -42.8% | $526.17M | 2.32% |
| MRVL Marvell Technology, Inc. | -1.66M | -99.2% | $494.54M | 0.013% |
| BE Bloom Energy Corp | -1.18M | -99.1% | $357.49M | 0.011% |
| AMZN Amazon Com Inc | -1.42M | -62.3% | $338.41M | 0.675% |
| ALAB Astera Labs, Inc. | -610.8K | -71.0% | $295.04M | 0.396% |
| VRT Vertiv Holdings Co | -867.3K | -45.1% | $290.40M | 1.16% |
| CRDO Credo Technology Group Holding Ltd | -709.2K | -76.6% | $192.88M | 0.194% |
| RVMD Revolution Medicines, Inc. | -955.8K | -61.4% | $178.99M | 0.37% |
| AAPL Apple Inc. | -559.3K | -17.9% | $161.85M | 2.45% |
| RCL Royal Caribbean Cruises Ltd | -377.6K | -74.7% | $119.90M | 0.134% |
| Holding | Shares | Trade Value | Weight |
|---|---|---|---|
| CRS Carpenter Technology Corp | +314.1K | $193.74M | 0.638% |
| PTCT Ptc Therapeutics, Inc. | +1.96M | $159.56M | 0.525% |
| LRCX Lam Research Corp | +285.6K | $123.77M | 0.407% |
| ASML Asml Holding Nv | +57.4K | $114.25M | 0.376% |
| SNDK Sandisk Corp | +49.0K | $111.47M | 0.367% |
| NPO Enpro Inc. | +286.6K | $108.01M | 0.356% |
| FROG JFrog Ltd | +1.11M | $101.29M | 0.333% |
| TTMI Ttm Technologies Inc | +416.1K | $77.81M | 0.256% |
| FPS Forgent Power Solutions, Inc. | +1.37M | $76.58M | 0.252% |
| RBRK Rubrik, Inc. | +937.3K | $75.25M | 0.248% |
| Holding | Shares Sold | Trade Value | Prior Weight |
|---|---|---|---|
| KTOS Kratos Defense & Security Solutions, Inc. | -1.56M | $110.22M | 0.469% |
| AIG American International Group, Inc. | -1.46M | $109.77M | 0.467% |
| PLTR Palantir Technologies Inc. | -674.6K | $98.67M | 0.419% |
| WGS GeneDx Holdings Corp. | -1.37M | $87.92M | 0.374% |
| FFIV F5, Inc. | -298.5K | $86.38M | 0.367% |
| CHRW C. H. Robinson Worldwide, Inc. | -429.5K | $71.33M | 0.303% |
| LOW Lowes Companies Inc | -301.0K | $71.11M | 0.302% |
| ZS Zscaler, Inc. | -427.9K | $60.03M | 0.255% |
| HUBS Hubspot Inc | -233.0K | $56.87M | 0.242% |
| IBP Installed Building Products, Inc. | -208.2K | $55.22M | 0.235% |
| # | Activity | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | NVDA Nvidia Corp | Technology | 8.08M | $1.62B | 5.32% | +1.76M | +27.9% | Added | 0.03% |
| 2 | GOOGL Alphabet Inc. | Technology | 3.75M | $1.34B | 4.41% | +1.72M | +85.0% | Added | 0.06% |
| 3 | ASND Ascendis Pharma A/S | Healthcare | 4.80M | $1.28B | 4.21% | -15.2K | -0.3% | Reduced | 7.92% |
| 4 | AXON Axon Enterprise, Inc. | Technology | 1.49M | $836.14M | 2.75% | +427.4K | +40.2% | Added | 1.84% |
| 5 | FTAI FTAI Aviation Ltd. | Industrials | 2.94M | $794.61M | 2.62% | +89.0K | +3.1% | Added | 2.86% |
| 6 | AAPL Apple Inc. | Technology | 2.57M | $744.75M | 2.45% | -559.3K | -17.9% | Reduced | 0.02% |
| 7 | FIX Comfort Systems Usa Inc | Industrials | 355.4K | $704.45M | 2.32% | -265.5K | -42.8% | Reduced | 1.01% |
| 8 | AVGO Broadcom Inc. | Technology | 1.56M | $587.98M | 1.94% | +319.6K | +25.8% | Added | 0.03% |
| 9 | MSFT Microsoft Corp | Technology | 1.41M | $527.56M | 1.74% | -235.2K | -14.3% | Reduced | 0.02% |
| 10 | HWM Howmet Aerospace Inc. | Industrials | 1.92M | $516.61M | 1.7% | -368.2K | -16.1% | Reduced | 0.48% |
| 11 | LLY ELI LILLY & Co | Healthcare | 416.7K | $499.84M | 1.65% | +52.2K | +14.3% | Added | 0.04% |
| 12 | SNOW Snowflake Inc. | Technology | 1.74M | $441.94M | 1.45% | +1.02M | +141.6% | Added | 0.5% |
| 13 | MKSI Mks Inc | Technology | 928.6K | $413.05M | 1.36% | -118.1K | -11.3% | Reduced | 1.37% |
| 14 | META Meta Platforms, Inc. | Technology | 677.4K | $381.57M | 1.26% | +150.6K | +28.6% | Added | 0.03% |
| 15 | VRT Vertiv Holdings Co | Industrials | 1.05M | $353.02M | 1.16% | -867.3K | -45.1% | Reduced | 0.27% |
Tip. Select a row to see that position’s full history at Westfield Capital Management.
As of its Q2 2026 13F filing, Westfield Capital Management Co LP’s five largest positions were Nvidia Corp (NVDA) at 5.3%, Alphabet Inc. (GOOGL) at 4.4%, Ascendis Pharma A/S (ASND) at 4.2%, Axon Enterprise, Inc. (AXON) at 2.8%, FTAI Aviation Ltd. (FTAI) at 2.6% of the reported portfolio.
Westfield Capital Management Co LP reported a 13F portfolio worth $30.38B across 268 positions for Q2 2026. That is up 29.1% from the previous quarter.
Its largest purchases by value were Alphabet Inc. ($615.51M), Nvidia Corp ($352.74M), Snowflake Inc. ($259.00M). It opened 63 new positions.
Its largest sales by value were Comfort Systems Usa Inc ($526.17M), Marvell Technology, Inc. ($494.54M), Bloom Energy Corp ($357.49M). It exited 35 positions entirely.
From the Form 13F-HR reports Westfield Capital Management Co LP files with the SEC each quarter, within 45 days of quarter end. A 13F lists long positions in US-listed equities and options; it excludes short positions, cash, bonds and most non-US holdings.
13F data reflects long positions in US-listed equities and options as reported to the SEC up to 45 days after quarter end. It excludes short positions, cash, bonds and most non-US securities, so it is not a complete picture of a manager’s assets.