Main Street Research LLC
Long book
$1.72B
Q1 2026
Positions
148
Top-10 weight
45%
concentration
Last quarter
+19.3%
SPY +14.8%
Turnover
27%
of book per quarter
Strategy in plain words
auto-generated from filingsMain Street Research LLC is a diversified fundamental manager, running a $1.72B US long book across 148 positions.
The portfolio is moderately concentrated (top 10 ≈ 45% of the book). The portfolio is actively managed, with meaningful quarterly turnover. Current anchor positions: NVIDIA CORP, APPLE INC, ALPHABET INC-CL A, ISHARES INTERNATIONAL SMALL, TAIWAN SEMICONDUCTOR-SP ADR.
Over the last 9 quarters its long book ran on average 1.1pp per quarter ahead of the S&P 500, beating the index in 5 of 9 quarters. We rate its filings as signal-bearing: position changes reflect genuine views.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
+5.7%
Q2 2024
+3.1%
Q3 2024
+4.1%
Q4 2024
-4.3%
Q1 2025
+17.4%
Q2 2025
+7.7%
Q3 2025
+0.1%
Q4 2025
-3.2%
Q1 2026
+19.3%
Sector allocation
Technology 45%
Consumer discretionary 16%
Industrials 16%
Financials 9%
Healthcare 7%
Materials 3%
Other 2%
Services media 1%
Long book by quarter
What does Main Street own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| NVDA NVIDIA CORP | Technology | 620.8K | $108.3M | 6.3% | +4.2% |
| AAPL APPLE INC | Technology | 403.6K | $102.4M | 6.0% | +38.7% |
| GOOGL ALPHABET INC-CL A | Technology | 311.8K | $89.7M | 5.2% | +4.8% |
| JPM JPMORGAN CHASE & CO | Financials | 223.8K | $65.8M | 3.8% | +0.8% |
| AVGO BROADCOM INC | Technology | 212.4K | $65.7M | 3.8% | +3.4% |
| MCK MCKESSON CORP | Consumer discretionary | 67.8K | $58.6M | 3.4% | +0.6% |
| AMZN AMAZON.COM INC | Consumer discretionary | 269.2K | $56.1M | 3.3% | +3.6% |
| ASML ASML HOLDING NV-NY REG SHS | Industrials | 41.7K | $55.1M | 3.2% | +3.9% |
| GLW CORNING INC | Industrials | 387.7K | $52.7M | 3.1% | New |
| COST COSTCO WHOLESALE CORP | Consumer discretionary | 46.1K | $46.0M | 2.7% | -26.0% |
| JNJ JOHNSON & JOHNSON | Healthcare | 186.9K | $45.7M | 2.7% | +4.2% |
| GEV GE VERNOVA INC | Industrials | 50.7K | $44.2M | 2.6% | +3.1% |
| CAT CATERPILLAR INC | Industrials | 61.1K | $43.3M | 2.5% | +2.6% |
| WMT WALMART INC | Consumer discretionary | 344.9K | $42.9M | 2.5% | +1.9% |
| CCJ CAMECO CORP | Materials | 389.1K | $42.3M | 2.5% | +1.9% |
| META META PLATFORMS INC-CLASS A | Technology | 71.0K | $40.6M | 2.4% | -18.0% |
| APH AMPHENOL CORP-CL A | Technology | 301.0K | $38.0M | 2.2% | +1.9% |
| AZN ASTRAZENECA PLC | Healthcare | 190.6K | $37.6M | 2.2% | New |
| MU MICRON TECHNOLOGY INC | Technology | 109.1K | $36.9M | 2.1% | +1949.8% |
| RY ROYAL BANK OF CANADA | Financials | 222.6K | $36.0M | 2.1% | New |
| KEYS KEYSIGHT TECHNOLOGIES IN | Technology | 112.9K | $31.9M | 1.9% | New |
| MSFT MICROSOFT CORP | Technology | 67.5K | $25.0M | 1.5% | -59.8% |
| PLTR PALANTIR TECHNOLOGIES INC-A | Technology | 167.6K | $24.5M | 1.4% | -61.9% |
| PG PROCTER & GAMBLE CO/THE | Other | 151.6K | $21.9M | 1.3% | +0.4% |
| FICO FAIR ISAAC CORP | Services media | 8.5K | $9.0M | 0.5% | +239.6% |
| GOOG ALPHABET INC-CL C | Technology | 23.4K | $6.7M | 0.4% | +16.7% |
| BRK/B BERKSHIRE HATHAWAY INC-CL B | Financials | 12.0K | $5.7M | 0.3% | -1.1% |
| PANW PALO ALTO NETWORKS INC | Technology | 34.0K | $5.5M | 0.3% | +157.1% |
| MCD MCDONALD'S CORP | Consumer discretionary | 15.5K | $4.8M | 0.3% | -16.7% |
| TSLA TESLA INC | Industrials | 12.3K | $4.6M | 0.3% | -3.2% |
| SCHW SCHWAB (CHARLES) CORP | Financials | 46.4K | $4.4M | 0.3% | +45.9% |
| ANET ARISTA NETWORKS INC | Technology | 35.0K | $4.3M | 0.2% | New |
| XOM EXXON MOBIL CORP | Energy | 23.9K | $4.1M | 0.2% | +3.1% |
| WFC WELLS FARGO & CO | Financials | 46.9K | $3.7M | 0.2% | +136.2% |
| BRK/A BERKSHIRE HATHAWAY INC-CL A | Financials | 5 | $3.6M | 0.2% | Held |
| CVX CHEVRON CORP | Energy | 16.9K | $3.5M | 0.2% | +77.0% |
| ADSK AUTODESK INC | Technology | 14.4K | $3.4M | 0.2% | +0.8% |
| V VISA INC-CLASS A SHARES | Services media | 10.2K | $3.1M | 0.2% | -94.1% |
| LLY ELI LILLY & CO | Healthcare | 2.9K | $2.7M | 0.2% | +104.9% |
| ABBV ABBVIE INC | Healthcare | 10.3K | $2.2M | 0.1% | +9.7% |
| CRM SALESFORCE INC | Technology | 6.9K | $1.3M | 0.1% | +8.8% |
| RTX RTX CORP | Industrials | 6.1K | $1.2M | 0.1% | +10.4% |
| MRK MERCK & CO. INC. | Healthcare | 9.5K | $1.1M | 0.1% | +22.3% |
| MMM 3M CO | Healthcare | 7.9K | $1.1M | 0.1% | -2.3% |
| DIS WALT DISNEY CO/THE | Services media | 10.7K | $1.0M | 0.1% | New |
| UNP UNION PACIFIC CORP | Industrials | 4.1K | $1.0M | 0.1% | +76.3% |
| CLX CLOROX COMPANY | Other | 9.5K | $988K | 0.1% | +4.5% |
| PHM PULTEGROUP INC | Industrials | 7.4K | $868K | 0.1% | New |
| CRUS CIRRUS LOGIC INC | Technology | 5.7K | $829K | 0.0% | New |
| UBER UBER TECHNOLOGIES INC | Services media | 11.5K | $827K | 0.0% | -97.4% |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | Apr 30, 2026 | 148 | $1.72B | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 9, 2026 | 129 | $1.75B | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 13, 2025 | 129 | $1.85B | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Aug 5, 2025 | 115 | $1.61B | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | Apr 30, 2025 | 101 | $1.53B | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Feb 7, 2025 | 110 | $1.60B | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Nov 12, 2024 | 109 | $1.59B | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Jul 29, 2024 | 103 | $1.52B | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | May 1, 2024 | 107 | $1.47B | canonical | SEC ↗ |
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