Most traders assume they understand the open. Then they watch a position reverse violently at 10:15am and realise the market was doing something specific — something they hadn't actually mapped out. The opening range isn't just chaos. It's a defined price structure that experienced traders treat as the day's anchor.

The opening range is simply the high and low printed during the first 15 minutes of a session. That window captures the initial surge of overnight orders, news reactions, and institutional positioning. Once those 15 minutes close, those two price levels — the range high and the range low — become reference points for the entire day's trade.

CONCEPTThe opening range high and low act as structural support and resistance for the remainder of the session.
WARNINGTrading inside the opening range during the first 15 minutes exposes you to maximum noise and minimum edge.
KEY IDEAProfessional traders often wait for the range to complete before committing to a directional bias.

Here's a concrete example. Suppose the ASX 200 futures open at 7,800 at 10:00am. By 10:15am, the session has printed a high of 7,825 and a low of 7,790. That 35-point band is the opening range. A trader watching this would now mark 7,825 as resistance and 7,790 as support on their chart and do nothing until price makes a decisive move relative to those levels.

High Low 10:00 10:15 Breakout ↑ Break ↓ Opening Range Mechanic

Once price breaks cleanly above 7,825, many traders interpret that as bullish continuation — institutions have absorbed early selling and buyers are in control. A break below 7,790 signals the opposite. The power of this method lies in its simplicity: two numbers, printed in the first quarter-hour, organise the rest of the session. Traders adjust for volatility by requiring a confirmed close beyond the range, not just a wick. For deeper context on how support and resistance function structurally, Investopedia's opening range explanation covers institutional usage thoroughly. The broader concept of support and resistance on Wikipedia provides useful historical background, and Investopedia's breakout definition clarifies exactly what constitutes a valid range break versus noise.

Two price levels. Fifteen minutes. That's the entire foundation — and most traders skip it entirely.

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