What Traders Mean by Opening Range
An opening range is a high and low printed over a fixed window after the cash open or Globex session you care about — commonly the first 5, 15, or 30 minutes of the RTH open for ES and NQ. A breakout approach treats a decisive trade through that high or low as the start of a directional attempt for the rest of the session.
Nothing about the label is magic. Two traders can both say they trade ORB and mean different windows, different confirmation rules, and different invalidation levels. Write your definition down before you automate or copy it.
A Clean Structure Before You Size
Decide the range window, the confirmation (close beyond the level vs. trade-through), the invalidation (back inside the range, opposite side, or a fixed tick stop), and the management plan (scale, trail, or fixed target). If those four are fuzzy, the journal cannot tell you whether the setup worked — only that you clicked something near the open.
Index futures around the cash open are busy. Spreads and slippage on stops matter. Plan size from dollar risk at the invalidation, not from how confident the breakout felt.
- Range window fixed before the session (example: first 15 minutes RTH).
- Entry rule binary enough that two people would take the same trade.
- Stop defined in ticks and dollars before the order is live.
- Daily loss and trailing buffer checked before the first ORB attempt.
Common Failure Modes
False breaks are normal. The range high gets taken, stops above get run, and price rotates back into the middle. Without a confirmation rule you are paying the open's noise tax every day.
Overtrading the open is the prop firm killer. Three ORB attempts at full size can exhaust a daily loss limit before 10:30 AM ET even if the third idea was the one that would have worked.
Copying an ORB signal across uneven accounts without per-account size and risk locks turns one noisy open into several evaluations under pressure at once.
Automation Without Pretending It Passes Evaluations
If your ORB rules are mechanical enough for Pine Script or another alert system, a webhook can place the leader order and MimikTrader can copy to followers with their own multipliers. That removes re-keying — it does not create edge.
If your ORB is discretionary (skipping news opens, reading acceptance), leader-follower copying of your manual fills is usually cleaner than forcing a rigid alert. See the comparison of webhook vs leader-follower paths for when each fits.
Not a signal service
This page does not provide trade signals, pass rates, or firm-specific guarantees. Futures trading involves substantial risk of loss. Check current firm rules before automating on any evaluation or funded account.
Risk First, Pattern Second
Size from the stop using a position size calculator. Cap the session with a daily loss you will actually honor. Know whether your account uses EOD or intraday trailing drawdown so an open winner that retraces does not silently raise the floor.
Those constraints are dull. They are also why ORB remains tradable for some people across months of opens instead of one spectacular Monday.
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