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Sortino Ratio

Risk-adjusted return metric using only downside deviation rather than total standard deviation.

Investment Management

FAQs

When should I use the Sortino Ratio over the Sharpe Ratio?

Use the Sortino Ratio when evaluating strategies with asymmetric return profiles—where upside volatility is desirable. It's especially useful for hedge funds, trend-following strategies, or any portfolio where you want to focus on protecting against losses rather than penalizing all volatility.

What is downside deviation?

Downside deviation measures the volatility of returns that fall below a target threshold (often zero or the risk-free rate). Unlike standard deviation, it ignores periods when returns exceed the target, focusing purely on the frequency and magnitude of underperformance.

Can a fund have a high Sortino but low Sharpe Ratio?

Yes. If a fund has high upside volatility (big positive months) alongside low downside volatility, the Sharpe Ratio will penalize the upside swings while the Sortino Ratio ignores them. This makes the Sortino Ratio higher relative to Sharpe for positively skewed strategies.

Related Terms

Sharpe Ratio

Risk-adjusted return metric measuring excess return earned per unit of total volatility.

Value at Risk

Statistical estimate of maximum potential loss over a time period at a given confidence level.

Alpha

Excess return of an investment relative to a benchmark index after adjusting for risk.

Efficient Frontier

Set of optimal portfolios offering highest expected return for each level of portfolio risk.

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The Sortino Ratio is a variation of the Sharpe Ratio that refines risk measurement by using downside deviation—the volatility of negative returns only—rather than total standard deviation. This distinction is important because investors typically only care about the risk of losing money, not about the 'risk' of outperforming expectations to the upside. The formula is: Sortino Ratio = (Portfolio Return − Target Return) / Downside Deviation. The target return (also called the minimum acceptable return or MAR) is often set to the risk-free rate or zero. A higher Sortino Ratio indicates the investment delivers more return per unit of downside risk. This makes the Sortino Ratio particularly useful for evaluating strategies with asymmetric return distributions, such as trend-following managed futures or option-selling strategies, where upside volatility is intentional but downside volatility is what truly concerns investors. Because many investments have positively skewed returns (frequent small gains, occasional large losses), the Sortino Ratio can provide a more realistic picture of risk than the Sharpe Ratio. For strategies that tend to have negatively skewed returns—like short volatility strategies—the Sortino Ratio may flatter performance because it ignores periods of positive volatility that precede large drawdowns. Like the Sharpe Ratio, the Sortino Ratio is sensitive to the choice of time period, data frequency, and target return threshold. Despite these caveats, it is widely used among hedge fund analysts and alternative investment managers as a more nuanced risk-return measure.