Diversifiable Risk
Quick Definition
Risk specific to individual securities or sectors that can be eliminated by holding a well-diversified portfolio of investments.
What Is Diversifiable Risk?
Diversifiable risk is the portion of total investment risk that can be reduced or eliminated through diversification. It's the same concept as unsystematic risk or specific risk.
Diversification and Risk Reduction:
| Portfolio Size | Total Risk | Diversifiable Risk | Market Risk (Remaining) |
|---|---|---|---|
| 1 stock | 100% | ~70% | ~30% |
| 5 stocks | ~60% | ~30% | ~30% |
| 10 stocks | ~45% | ~15% | ~30% |
| 20 stocks | ~35% | ~5% | ~30% |
| 30+ stocks | ~32% | ~2% | ~30% |
| Total market | ~30% | ~0% | ~30% |
Types of Diversifiable Risk:
| Risk Type | Example | Diversification Solution |
|---|---|---|
| Company failure | Enron bankruptcy | Hold 30+ stocks |
| Sector decline | Oil price crash hits energy | Diversify across sectors |
| Geographic risk | Country-specific recession | Global diversification |
| Management risk | CEO scandal | Multiple companies |
| Product risk | Product recall | Multiple industries |
Key Insight — The Free Lunch: Diversification is called "the only free lunch in investing" because it reduces risk without reducing expected return. You eliminate uncompensated risk while maintaining exposure to compensated (market) risk.
Common Diversification Mistakes:
- Holding 50 tech stocks is NOT diversified (same sector risk)
- Owning 5 different S&P 500 index funds is NOT diversified (all track same index)
- True diversification requires variety in: sector, geography, asset class, and style
Diversifiable Risk Example
- 1Holding 30 stocks across sectors eliminates ~95% of diversifiable risk — only market risk remains
- 2An index fund holding 500+ stocks has virtually zero diversifiable risk
Related Terms
Unsystematic Risk
Company-specific or industry-specific risk that can be reduced or eliminated through diversification.
Systematic Risk
Market-wide risk that affects all securities and cannot be eliminated through diversification, also called market risk.
Diversification
Spreading investments across various assets, sectors, and geographies to reduce risk without sacrificing expected returns.
Concentration Risk
The risk of amplified losses when a portfolio is heavily weighted in a single asset, sector, or investment type.
Standard Deviation
A statistical measure of how spread out returns are from the average, quantifying investment volatility and risk.
Risk Management
The systematic process of identifying, assessing, and mitigating financial risks to protect portfolio value and achieve investment objectives.
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