Main Street Research LLC reported 114 positions worth $1.81B for the quarter ended Jun 30, 2026, up 23.8% on the prior quarter. It opened 10 new positions, added to 55, trimmed 44 and exited 21. Its largest holding is Nvidia Corp at 7% 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 |
|---|---|---|---|---|
| ROST Ross Stores, Inc. | +150.8K | – | $32.09M | 1.78% |
| FTI TechnipFMC plc | +413.7K | – | $27.43M | 1.52% |
| BCS Barclays Plc | +770.5K | +90.5% | $20.70M | 2.41% |
| TSM Taiwan Semiconductor Manufacturing Co Ltd | +5,270 | +2.4% | $2.52M | 6.04% |
| NVDA Nvidia Corp | +9,277 | +1.5% | $1.86M | 6.98% |
| GOOGL Alphabet Inc. | +5,161 | +1.7% | $1.84M | 6.27% |
| GLW Corning Inc | +6,340 | +1.6% | $1.62M | 5.57% |
| ASML Asml Holding Nv | +709 | +1.7% | $1.41M | 4.67% |
| APH Amphenol Corp | +15.3K | +2.5% | $1.35M | 3.01% |
| FICO Fair Isaac Corp | +1,116 | +13.2% | $1.33M | 0.634% |
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| GLDM World Gold Trust | -469.5K | -100.0% | $43.51M | Exited |
| MCK Mckesson Corp | -39.3K | -58.0% | $29.69M | 1.19% |
| PLTR Palantir Technologies Inc. | -156.2K | -93.2% | $18.22M | 0.074% |
| IBIT iShares Bitcoin Trust ETF | -196.1K | -100.0% | $7.53M | Exited |
| PANW Palo Alto Networks Inc | -10.7K | -31.4% | $3.64M | 0.441% |
| MCD Mcdonalds Corp | -6,570 | -42.4% | $1.78M | 0.133% |
| DIS Walt Disney Co | -10.7K | -100.0% | $1.03M | Exited |
| GLD Spdr Gold Trust | -1,806 | -100.0% | $777.10K | Exited |
| MU Micron Technology Inc | -473 | -0.4% | $545.98K | 6.94% |
| UNP Union Pacific Corp | -1,716 | -41.6% | $466.75K | 0.036% |
| Holding | Shares | Trade Value | Weight |
|---|---|---|---|
| ROST Ross Stores, Inc. | +150.8K | $32.09M | 1.78% |
| FTI TechnipFMC plc | +413.7K | $27.43M | 1.52% |
| HUT Hut 8 Corp. | +3,986 | $460.16K | 0.025% |
| UAL United Airlines Holdings, Inc. | +2,344 | $318.76K | 0.018% |
| MNST Monster Beverage Corp | +5,934 | $285.19K | 0.016% |
| QCOM Qualcomm Inc | +1,375 | $254.01K | 0.014% |
| ABEO Abeona Therapeutics Inc. | +38.5K | $238.02K | 0.013% |
| HIMS Hims & Hers Health, Inc. | +6,200 | $214.95K | 0.012% |
| KO Coca Cola Co | +2,558 | $207.90K | 0.012% |
| DDOG Datadog, Inc. | +791 | $205.95K | 0.011% |
| Holding | Shares Sold | Trade Value | Prior Weight |
|---|---|---|---|
| GLDM World Gold Trust | -469.5K | $43.51M | 2.98% |
| IBIT iShares Bitcoin Trust ETF | -196.1K | $7.53M | 0.516% |
| DIS Walt Disney Co | -10.7K | $1.03M | 0.071% |
| GLD Spdr Gold Trust | -1,806 | $777.10K | 0.053% |
| ISRG Intuitive Surgical Inc | -839 | $386.77K | 0.027% |
| BSX Boston Scientific Corp | -5,993 | $376.06K | 0.026% |
| ACN Accenture plc | -1,683 | $333.72K | 0.023% |
| INTU Intuit Inc. | -712 | $308.04K | 0.021% |
| COIN Coinbase Global, Inc. | -1,550 | $270.65K | 0.019% |
| COP Conocophillips | -1,950 | $257.40K | 0.018% |
| # | Activity | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | NVDA Nvidia Corp | Technology | 630.1K | $126.07M | 6.98% | +9,277 | +1.5% | Added | 0% |
| 2 | MU Micron Technology Inc | Technology | 108.6K | $125.40M | 6.94% | -473 | -0.4% | Reduced | 0.01% |
| 3 | AAPL Apple Inc. | Technology | 406.1K | $117.52M | 6.51% | +2,551 | +0.6% | Added | 0% |
| 4 | GOOGL Alphabet Inc. | Technology | 316.9K | $113.27M | 6.27% | +5,161 | +1.7% | Added | 0% |
| 5 | TSM Taiwan Semiconductor Manufacturing Co Ltd | Technology | 228.4K | $109.09M | 6.04% | +5,270 | +2.4% | Added | 0% |
| 6 | GLW Corning Inc | Basic Materials | 394.1K | $100.65M | 5.57% | +6,340 | +1.6% | Added | 0.05% |
| 7 | ASML Asml Holding Nv | Technology | 42.4K | $84.34M | 4.67% | +709 | +1.7% | Added | 0.01% |
| 8 | AVGO Broadcom Inc. | Technology | 213.8K | $80.78M | 4.47% | +1,439 | +0.7% | Added | 0% |
| 9 | JPM Jpmorgan Chase & Co | Financial Services | 226.3K | $74.07M | 4.1% | +2,537 | +1.1% | Added | 0.01% |
| 10 | CAT Caterpillar Inc | Industrials | 61.8K | $65.77M | 3.64% | +649 | +1.1% | Added | 0.01% |
| 11 | AMZN Amazon Com Inc | Consumer Discretionary | 274.7K | $65.48M | 3.63% | +5,545 | +2.1% | Added | 0% |
| 12 | GEV GE Vernova Inc. | Industrials | 50.8K | $59.69M | 3.3% | +110 | +0.2% | Added | 0.02% |
| 13 | APH Amphenol Corp | Industrials | 617.4K | $54.43M | 3.01% | +15.3K | +2.5% | Added | 0.03% |
| 14 | JNJ Johnson & Johnson | Healthcare | 188.6K | $47.91M | 2.65% | +1,758 | +0.9% | Added | 0.01% |
| 15 | RY Royal Bank Of Canada | Financial Services | 227.1K | $47.01M | 2.6% | +4,568 | +2.1% | Added | 0.02% |
Tip. Select a row to see that position’s full history at Main Street Research.
As of its Q2 2026 13F filing, Main Street Research LLC’s five largest positions were Nvidia Corp (NVDA) at 7.0%, Micron Technology Inc (MU) at 6.9%, Apple Inc. (AAPL) at 6.5%, Alphabet Inc. (GOOGL) at 6.3%, Taiwan Semiconductor Manufacturing Co Ltd (TSM) at 6.0% of the reported portfolio.
Main Street Research LLC reported a 13F portfolio worth $1.81B across 114 positions for Q2 2026. That is up 23.8% from the previous quarter.
Its largest purchases by value were Ross Stores, Inc. ($32.09M), TechnipFMC plc ($27.43M), Barclays Plc ($20.70M). It opened 10 new positions.
Its largest sales by value were World Gold Trust ($43.51M), Mckesson Corp ($29.69M), Palantir Technologies Inc. ($18.22M). It exited 21 positions entirely.
From the Form 13F-HR reports Main Street Research LLC 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.