What Is How Many Stocks Should You Own? The Research-Backed Answer?
Academic research shows that 15-30 stocks provide 85-90% of the diversification benefits of holding the entire market. Beyond 30 stocks, additional diversification provides minimal risk reduction while increasing research requirements, transaction costs, and monitoring complexity.
Why It Matters
The optimal number depends on your approach. Active investors who research each holding thoroughly may be effective with 15-20 carefully selected stocks. Passive investors using ETFs may hold fewer individual names. Concentrated portfolios (10-15 stocks) can outperform but require higher conviction and tolerate higher volatility.
How LyraIQ Approaches This
LyraIQ's portfolio size analyzer evaluates your current diversification effectiveness and identifies whether adding or removing positions would improve risk-adjusted returns. The system considers correlation structure, sector concentration, and your monitoring capacity — recommending a personalized optimal portfolio size.
Practical Steps
- Start with 15-20 stocks for most retail investors
- Ensure no single position exceeds 10% of portfolio
- Cap any sector at 25% to prevent concentration risk
- Use 2-3 ETFs for core exposure and 10-15 individual stocks for satellite
- Reduce count if you cannot monitor each position quarterly