Standard Deviation - Stocks

This is a measure of the range of a stock's monthly return performance. A high standard deviation indicates that a stock's range of performance has been wide—that is, relatively volatile—and a low figure indicates less historical volatility. It is an annualized statistic based on the trailing 36 monthly returns. The standard deviation for the benchmark is also listed.

Benefit

When a stock has a high deviation figure, the range of performance is very wide, indicating a greater potential for volatility.

Origin

Morningstar calculates this figure in-house using the trailing monthly total returns to derive the monthly standard deviations, which are then annualized.