RSI – Relative Strength Index Definition

A security’s RSI, or Relative Strength Index, is a measurement that tracks the momentum of a stock, tracking when a stock becomes overbought or oversold.

A scale of 0-100, RSI values over 70 indicate overbought conditions, in which an investor might expect to see some sell off, and values under 30 indicate oversold/undervalued conditions, where an investor may expect to see some increase in price.