Investor Corner/Building and judging a portfolio/Performance Measurement
3.2.6 Information Ratio
The information ratio measures a fund's excess return over its benchmark, divided by how consistently that excess return was delivered. It is one of the more direct ways to measure genuine active management skill.
Rewarding consistency of outperformance, not just its size
A fund that beats its benchmark by a small amount, but does so reliably and consistently across many periods, will show a higher information ratio than a fund that beats its benchmark by a larger amount in some periods while trailing badly in others. The ratio is specifically designed to reward steady, repeatable skill over an outcome that looks impressive purely because of one or two standout years.
The information ratio divides a fund's active return (return above the benchmark) by its tracking error (the volatility of that active return). It answers the question: for every unit of deviation from the benchmark the manager took, how much excess return was generated? An information ratio of 0.5 means the manager generated half a percentage point of excess return for every percentage point of tracking error. Above 0.5 is generally considered good; above 1.0 is exceptional and rare on a sustained basis.
How it differs from the Sharpe ratio
The Sharpe ratio measures return relative to total risk taken, using the risk-free rate as its reference point. The information ratio instead measures return relative to a chosen benchmark, using the consistency of that benchmark-beating performance as its reference point. It is specifically built for judging active managers against the very benchmark they are actually trying to beat.
The information ratio is the most precise measure of active management skill available. High active return alone does not prove skill if it came from taking massive, concentrated bets that happened to work. The information ratio adjusts for this by measuring how efficiently the active risk was converted into active return. A manager who outperformed by 3% with a tracking error of 2% (IR = 1.5) demonstrated more skill than one who outperformed by 3% with a tracking error of 8% (IR = 0.375), because the second manager took four times as much active risk to achieve the same excess return.
Where to find it and how to use it
Information ratio is available on many fund research platforms and factsheets, generally calculated over a stated multi-year period. As with most single-figure ratios, it is most useful alongside other measures rather than as a lone deciding factor, but a consistently higher information ratio over a genuine multi-year period is a reasonably meaningful signal of skill.
How PriLytics helps. PriLytics shows your fund's performance against its benchmark over any period you choose, giving you the raw data behind ratios like this for your own actual holdings. Compare against a benchmark.
For Indian active fund evaluation, the information ratio should be computed over a full market cycle (at least 5-7 years) to capture both bull and bear phases. A fund with a high IR only during bull markets may be taking concentrated bets that work in rising markets but collapse in downturns. Consistency of the IR across different market environments is a stronger signal of genuine skill than a high IR in a specific favourable period. When comparing active funds within the same category, the information ratio is the single best metric for identifying which manager is converting active risk into active return most efficiently.