What Is an Opening Range Breakout?

An Opening Range Breakout, usually shortened to ORB, is a trading approach built around the market's first defined period of activity. The strategy records a high and low during that opening window, then watches what happens when price moves beyond either boundary.

The appealing part is its structure. Before the session develops, an ORB can define what it is watching, when it is allowed to act, where the trade is wrong, and when the opportunity has expired.

The opening range is a reference, not an entry

The high and low of the opening window create two visible levels. Crossing one of those levels is a breakout, but a breakout does not automatically have to become a trade.

A rules-based ORB may also ask:

• Did the range finish forming before the breakout?
• Is the move occurring inside the permitted entry window?
• Does the broader price structure qualify the direction?
• Is the range usable, rather than abnormally narrow or wide?
• Has the strategy already used its allowed trade for the session?

Those checks are why two strategies can both be called “ORB” and still behave very differently.

A complete ORB needs an invalidation point

An entry rule by itself is not a complete strategy. The system also needs to define the price at which its original idea is no longer valid. That distance determines the trade's initial risk.

Targets are often expressed as multiples of that initial risk. If the distance from entry to stop is one unit of risk, a 2R target is twice that distance. The notation describes geometry, not expected profit and not the amount of money risked by a particular account.

Why automation helps—and what it cannot solve

Automation can apply the same timing and qualification rules without requiring someone to watch every bar. It can also keep the intended stop, target, account state, and session limits visible in one place.

It cannot remove slippage, connection failures, unexpected market behavior, or losses. It also cannot make a weak set of rules profitable merely by executing them consistently.

What to inspect before using any ORB

Look beyond a headline return. A useful evaluation explains the exact session hours, opening-range duration, qualification rules, entry window, stop and target logic, costs, contract assumptions, and what happens when data or execution is incomplete.

ORB Runner publishes its historical modeled evidence separately from its forward market observation. That separation matters: a backtest describes how fixed rules behaved on historical data, while a forward record describes what the reference system actually observed after publication.