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Good Trading Guide

Opening Range Breakout (ORB) Strategy for US Index Futures

At a glance
Status Education only. Hypothetical example, not a recommendation.
Difficulty Beginner to intermediate
Markets US index futures (MES/MNQ, ES/NQ) at the 14:30 UK open; also FTSE 100 and Germany 40 (DAX)
Timeframe 5-minute chart (15-minute opening range)
Time needed (UK) FTSE/DAX: about 07:50–10:00. US indices: about 14:20–16:30
Trades per day 0–1 per market
Main risk Fast moves at the open, slippage, false breakouts
Course module Module 11: Beginner Strategies
All strategies
Back to course

The opening range breakout – usually shortened to ORB – is a classic day-trading approach for stock indices. The idea was popularised by trader Toby Crabel in his 1990 book on short-term price patterns and the opening range. You let the market open, mark the high and low of the first few minutes, and then trade a breakout of that range.

For UK traders it’s practical because there are two clear opportunities a day: the European open at 08:00 UK time and the US open, usually 14:30 UK time – which works for many people with jobs, at least on some days.

The idea behind the strategy

The first minutes after a cash market opens are often the busiest of the day. Overnight news, orders queued up before the open and institutional activity all hit the market at once. The opening range – the high and low of, say, the first 15 minutes – captures that early tug-of-war.

When price breaks decisively out of the opening range, it can mean one side has won the early battle, and the move may carry on for a while. ORB traders aim to catch that continuation with a stop back inside the range.

The catch: the open is also when price is most erratic. Breakouts can reverse sharply, spreads can be wider, and stops can slip. Many days produce no clean move at all.

Key opening times in UK time

Market Cash open (UK time) Opening range (15-min) Notes
FTSE 100 08:00 08:00–08:15 London Stock Exchange continuous trading runs 08:00–16:30 (LSE)
Germany 40 (DAX) 08:00 08:00–08:15 Xetra open (09:00 Frankfurt time)
S&P 500, Nasdaq 100, Dow Usually 14:30 14:30–14:45 09:30 New York time. It shifts by an hour for a few weeks in spring and autumn when UK and US clocks change on different dates

Many providers quote indices around the clock, but the opening range should be based on the cash market open, when the real surge of activity happens.

The rules (a complete beginner version)

These are example rules for learning and backtesting.

1. Choose one market and one session

  • Start with one index – for example the S&P 500 (US session) or the FTSE 100 (European session).
  • Use a 5-minute chart set to UK time.

2. Mark the opening range

  • Mark the high and low of the first 15 minutes after the cash open (three 5-minute candles).

3. Filters (skip bad days)

  • Range too wide: skip if the opening range is more than 30% of the market’s 14-day daily ATR. A huge opening range means a huge stop and less room left to run.
  • Range too narrow: skip if the range is smaller than about 2× the normal spread. Tiny ranges get triggered by noise.
  • Major news: skip if high-impact data is released in the first hour (for example, major US data is often released at 13:30 UK time – check the economic calendar; if price is still reacting at the open, consider skipping).
  • Holidays and half-days: skip.

4. Entry

  • After the range is set (e.g. at 14:45 for US indices), place:
  • a buy stop a small buffer above the range high, and
  • a sell stop the same buffer below the range low.
  • Use one-cancels-the-other (OCO) orders if available.
  • Entry window: the first 90 minutes after the range ends. Cancel unfilled orders after that.

5. Stop-loss

  • Midpoint of the opening range (tighter, more frequent stop-outs), or
  • Opposite side of the range (wider, fewer stop-outs). Test both separately – pick one and stay consistent.

6. Exit

  • Target: 2R.
  • Time exit: close any open trade by 16:00 UK (FTSE/DAX session) or 20:30 UK (US session) – before the closing period.
  • One trade per market per day. No re-entry after a stop-out.

Worked example (hypothetical)

All prices are made up for teaching.

Setup: Demo account £10,000, risk 1% (£100). S&P 500 spread bet, 5-minute chart, US session.

  1. Opening range (14:30–14:45): high 5,612, low 5,598. Range = 14 points.
  2. Filters: 14-day ATR = 60 points; 30% of that = 18. The range (14) is under 18 – valid. No major news in the first hour.
  3. Orders at 14:45: buy stop at 5,613.5, sell stop at 5,596.5 (1.5-point buffer).
  4. Stop method: midpoint = 5,605. For a long: 5,613.5 − 5,605 = 8.5 points of risk.
  5. Position size: £100 ÷ 8.5 = £11.76 per point. Round down to £11 per point. Actual risk = £93.50.
  6. Target (2R): 17 points → 5,630.5.
  7. Trigger: at 14:58, price breaks above 5,613.5. Long filled; sell stop cancelled.

Outcome A: price runs to 5,630.5 at 15:40. Profit = 17 × £11 = +£187 (+2R). Outcome B: price spikes above the range, then reverses and hits 5,605. Loss = −£93.50 (−1R) (possibly more if the stop slips in a fast move). Outcome C: price drifts to 5,620 and stalls. Time exit at 20:30 for +6.5 points = +£71.50 (+0.76R).

Worked example on MES futures (hypothetical)

All prices are made up for teaching. Tick value from CME Group, checked 18 October 2026.

Setup: Futures simulator, risk $100 per trade. Micro E-mini S&P 500 (MES, $1.25 per tick, $5 per point), 5-minute chart, US open at 14:30 UK.

  1. Opening range (14:30–14:45): high 6,012.00, low 6,000.00. Range = 12 points.
  2. Orders at 14:45: buy stop at 6,013.00, sell stop at 5,999.00 (4-tick buffer).
  3. Stop: midpoint 6,006.00. For a long, risk = 7 points = 28 ticks = $35 per contract.
  4. Size: $100 ÷ $35 = 2.86 → 2 contracts ($70 at risk).
  5. Target (2R): 14 points → 6,027.00.

Outcome A: target hit: 14 points × $5 × 2 = +$140. Outcome B: stopped at 6,006.00: −$70, plus commission and any slippage.

On a prop account with an intraday trailing drawdown, if the trade reaches +10 points (+$100) and then reverses to your stop, your drawdown floor has still moved up by $100. Many futures traders take partial profits at 1R for this reason. See 1F.10 Futures prop rules.

Risk management

Stake per point = (account × risk %) ÷ stop distance in points

  • Risk 0.5–1% per trade.
  • Allow for slippage. At the open, stops can fill worse than your price. In testing, add a realistic slippage allowance to losing trades.
  • One market at a time to start. The FTSE 100 and DAX often move together at 08:00, and the US indices at 14:30. Trading all of them is one big correlated bet (Correlation risk).
  • Daily loss limit. Stop for the day after one loss. Stop for the week after −3R.
  • Spread check. If the spread is unusually wide at the open, wait or skip.

Using it in a prop firm challenge

ORB is popular with traders at futures prop firms, because US index futures (such as micro E-mini contracts) are among the main products they offer.

What fits well: – Defined, same-day trades make it easy to stay inside daily loss limits. – No overnight holding. – Clear rules make it easier to avoid overtrading.

What to watch: – Trailing drawdown: many futures prop firms use trailing or end-of-day drawdown. A trade that goes well into profit and then reverses can tighten your limit even if it closes flat. Learn the details in Trailing vs static drawdown. – Contract sizing: futures move in fixed tick values per contract, so you can’t fine-tune size the way you can with a spread bet stake. On a small account, even one contract may risk more than 1%. Micro contracts help, but check the maths every time. – News rules and consistency rules vary by firm – check them. – Slippage at the open affects simulated and live accounts differently depending on the firm’s platform.

Compare futures firms’ drawdown types and rules on our futures prop firm comparison, and run your numbers through the True Cost Calculator.

Common mistakes

  1. Trading before the range is complete. Jumping in during the first five minutes isn’t ORB – it’s guessing.
  2. Using the wrong open time. US opening times in UK time shift for a few weeks each spring and autumn. Check every year.
  3. Ignoring range size. Huge opening ranges produce huge stops. Skip them.
  4. Re-entering after a fakeout. “It reversed, so I’ll go the other way” is an untested strategy and often a revenge trade.
  5. Holding into the close or overnight “because it might come back”.
  6. Trading three indices at once without realising they’re highly correlated.
  7. Not allowing for slippage in backtests – results will look better than real life.

How to backtest ORB

  1. One market, one session, 12+ months of 5-minute data. Use bar replay.
  2. Record every trading day, including skipped days and the reason.
  3. Log: date, range high/low, range size, ATR, direction, entry, stop, exit, exit reason (target/stop/time), R result, slippage estimate.
  4. Include costs and slippage – especially on stop-outs.
  5. At least 100 trades before judging.
  6. Test one variable at a time: 5- vs 15- vs 30-minute range; midpoint vs opposite stop; 1.5R vs 2R target.
  7. Note the day of the week and any news – patterns may emerge, but be wary of drawing conclusions from small samples.

Then forward test on demo for at least 60 days (Demo trading) and keep a trading journal.

FAQ

What is the opening range? The high and low of the first few minutes (commonly 5, 15 or 30) after a cash market opens.

What time is the US open in UK time? Usually 14:30 UK time (09:30 New York). For a few weeks each spring and autumn, when the UK and US change clocks on different dates, it’s 13:30 UK.

Which is better: a 5-, 15- or 30-minute opening range? Shorter ranges trigger more often but give more false breakouts. Longer ranges trigger less often with wider stops. Test them separately on your market.

Does ORB work on forex? Forex doesn’t have a single cash “open” in the same way. The closest equivalent is the London breakout strategy.

Is ORB good for prop firm challenges? It can fit daily loss rules well, but trailing drawdown, contract sizing and slippage need careful thought. Practise under the firm’s exact rules on demo first.

Related pages

  • Course: Trading sessions in UK time · Limit and stop orders · Volume and volatility · Position sizing
  • Strategies: London breakout · FTSE 100 trading strategy · ORB for futures prop firms
  • Prop firms: Futures prop firms compared · True Cost Calculator

Disclaimer: This page is general education, not financial or investment advice or a personal recommendation, and it doesn’t take your circumstances into account. Examples are hypothetical, for illustration only, and not an invitation to buy or sell. No strategy works all the time, and every strategy has losing runs. Learning a strategy doesn’t guarantee profits. Past performance is not a reliable guide to future results. Futures, spread bets and CFDs are complex and carry a high risk of losing money quickly because of leverage, and most retail traders lose money. With a real futures account, losses can exceed your deposit. Only trade with money you can afford to lose, and speak to an independent FCA-authorised adviser if you’re unsure. The rules are an example for learning and testing, and the worked example is hypothetical. No performance is implied or promised. Read our full risk warning.