A day-trading strategy using the high-low range formed just after the open as a reference: buy the upside break, sell the downside break. Covered down to concrete numeric rules, filters, position sizing, and the conditions under which the edge breaks.
Opening Range Breakout (ORB) is a day-trading strategy that uses the high and low of a fixed period just after the open as a reference box: you buy when price breaks above it and sell when it breaks below.
The range formed in the first 5 or 15 minutes represents the day's first point of agreement. A clean break of that box is treated as the signal that the day's direction is starting to resolve.
What ORB goes after is the tendency for direction to emerge at the open, the time of day when information and orders are most concentrated.
Earnings released after the prior close, overnight news, the pre-open order book. All of it gets digested in the first few minutes of trading, and the tug-of-war between buyers and sellers reaches its first verdict. ORB rides the direction of that verdict.
You are not predicting. You wait for the opening range to break, then follow the direction of the break. It is a passive design that hands the directional call over to the market itself.
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