Main Street Research LLC Portfolio Analytics
Investment Analysis & Holdings Breakdown
Comprehensive portfolio analytics for Main Street Research LLC with $1.9B in long positions as of Q3 2025, 38% allocated to Technology, and 43% concentrated in top 10 positions.
- Portfolio Value
- $1.9B
- Top 10 Concentration
- 43%
- Top Sector
- Technology (38%)
- US Exposure
- 87%
- Market Cap Focus
- Mega Cap
- Countries
- 7
Composition Analysis
Portfolio breakdown by sector, industry, and market capitalization
Sector Allocation
Industry Breakdown
47 industries across all sectors
Filter by Sector
Select a sector to filter industries
Market Cap Distribution
Portfolio Concentration
Geographic Exposure
Portfolio breakdown by country of incorporation
Domestic (US)
International
Countries
Largest Int'l Market
Holding Behavior
Investment patterns and position management analysis
Portfolio Stability & Commitment
- Avg. Top 10
- 22.4 quarters
- Avg. Top 20
- 20.9 quarters
- Avg. All Positions
- 16.9 quarters
- Median Holding Period
- 7 quarters
- Persistence Rate
- 64.34%
- Persistent Holdings Weight
- 74.06%
- Persistent Positions
- 83
- Longest Held
Merck & Co., Inc.MRK - 49 quarters
Position Sizing & Influence
Current Quarter
- Avg. New Position
- 0.99%
- Avg. Position Weight
- 0.78%
- Largest Position
Nvidia CorpNVDA - 6.06%- Largest Ownership Stake
Cameco CorporationCCJ - 0.08%- Avg. Ownership Stake
- 0.01%
- Ownership Stake >5%
- 0
- Ownership Stake >1%
- 0
Historical (Since Q2 2013)
- Avg. New Position
- 0.83%
- Avg. Ownership Stake
- 0.02%
- Largest Position
Procter & Gamble CompanyPG - 15.62% (Q4 2018)- Largest Ownership Stake
Local Bounti CorporationLOCL - 0.64% (Q2 2022)
Portfolio Turnover
Current Quarter
- Turnover Ratio
- 16.6%
- Value Traded
- $306.61M
- Positions Added
- 9
- Positions Exited
- 6
Historical (Since Q2 2013)
- Avg. Turnover Ratio
- 15.7%
- Avg. Positions Added
- 9
- Avg. Positions Exited
- 11
- Highest Turnover
- 91.3%Q4 2018
- Lowest Turnover
- 1.5%Q4 2013