Information Ratio
Quick Definition
A measure of portfolio performance relative to a benchmark, divided by the tracking error, indicating the consistency of active management skill.
What Is Information Ratio?
The Information Ratio (IR) measures how much excess return a portfolio manager generates relative to a benchmark per unit of additional risk taken. It's the key metric for evaluating active fund managers.
Formula: Information Ratio = (Portfolio Return - Benchmark Return) / Tracking Error
Interpreting Information Ratios:
| IR Value | Interpretation |
|---|---|
| > 0.75 | Exceptional (top-tier manager) |
| 0.50 - 0.75 | Very good |
| 0.25 - 0.50 | Good |
| 0.00 - 0.25 | Marginal |
| < 0.00 | Underperforming benchmark |
Example Calculation:
- Fund return: 12%, Benchmark return: 10%, Tracking error: 4%
- IR = (12% - 10%) / 4% = 0.50 (very good)
IR vs. Sharpe Ratio:
| Feature | Information Ratio | Sharpe Ratio |
|---|---|---|
| Benchmark | Specific index | Risk-free rate |
| Risk Measure | Tracking error | Total std deviation |
| Best For | Active managers | Any portfolio |
| Measures | Consistency of alpha | Risk-adjusted return |
Key Insight: A high IR means the manager consistently beats the benchmark. A high alpha with high tracking error (inconsistent outperformance) yields a low IR.
Why It Matters:
- Helps identify truly skilled managers vs. lucky ones
- An IR of 0.5 sustained over 5+ years is rare and valuable
- Most active managers have negative IRs after fees
Formula
Formula
IR = (Rp - Rb) / TEInformation Ratio Example
- 1A fund manager with IR of 0.6 over 10 years demonstrates genuine, consistent stock-picking skill
- 2Most actively managed funds have negative information ratios after accounting for fees
Related Terms
Alpha (α)
The excess return of an investment relative to a benchmark index, representing the value added (or lost) by active management or stock selection.
Tracking Error
The standard deviation of the difference between a portfolio's returns and its benchmark returns, measuring how closely a fund follows its index.
Sharpe Ratio
A risk-adjusted return metric measuring excess return per unit of risk, helping compare investments with different risk levels.
Treynor Ratio
A risk-adjusted performance measure that evaluates returns earned per unit of systematic (market) risk, as measured by beta.
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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