Sortino Ratio

How it works

The Sharpe ratio penalises all volatility equally — but in reality investors rarely complain when a fund jumps sharply *up*. The Sortino ratio fixes this asymmetry by dividing excess return by only the downside deviation: the volatility of negative returns that fall below a target threshold. It rewards funds that achieve their returns without inflicting large *losses* along the way, treating upside swings as entirely harmless.

A higher Sortino ratio therefore means a fund delivered more return per unit of *harmful* downside risk — arguably a more intuitive and investor-friendly measure of risk-adjusted performance than the Sharpe ratio.

In India

Indian fund-research platforms and factsheets increasingly report the Sortino ratio right alongside the more familiar Sharpe ratio. It is most useful for comparing funds within the same category — two mid-cap funds, say — where you genuinely want to identify the one that grew its capital with the gentlest downside experience for investors.

It is especially relevant for funds with asymmetric return patterns, such as certain hybrid or aggressive equity funds that show sharp up-moves but where you still very much want to limit the depth of drawdowns.

Why it matters

Because real investors fear losses far more than they enjoy equivalent gains, the Sortino ratio aligns much better with how people actually experience and react to risk. A fund with a high Sortino ratio has historically protected capital well on the downside while still delivering competitive returns — exactly the profile most long-term investors want.

Common mistakes

Don't compare Sortino ratios across different fund categories — the target return and risk profiles differ too much to be meaningful. Don't rely on a single short-term figure, since it shifts with the market cycle. And use it alongside, rather than instead of, the Sharpe ratio and plain absolute returns — no single ratio captures everything that matters about a fund's behaviour.