what is an opening range breakout
An opening range breakout, or ORB, is a rules-based way to measure the first part of a trading session and evaluate what happens when price leaves that range.
The opening range is the highest and lowest traded price during a chosen window after the regular session opens. Traders commonly study 5-, 15-, and 30-minute windows, but the correct definition is the one written into the plan before the session begins.
The range high, range low, and midpoint create a shared map. They do not predict direction. They define where a possible break, failure, retest, or chop condition can be measured consistently.
Some ORB rules enter as soon as price trades beyond the boundary. Others require a candle close outside the range, an open-and-close qualification, or a later retest. These definitions can produce very different samples and should never be mixed when comparing results.
A useful hit rate shows both the percentage and the number of qualified trades behind it. A 70% result from ten trades does not carry the same evidence as a 70% result from two hundred trades. Market regime, data source, fees, slippage, and execution also affect what a trader can actually realize.
The ORB is most useful when it reduces improvisation. Before acting, know what confirms the setup, what invalidates it, where the first target sits, and when the move is too late or too extended to chase.
Historical patterns and target hit rates do not guarantee future results. This guide is general education, not personalized investment advice. Confirm market data with your broker and define risk before entering a trade.