Gap Trading Strategy: Play the Open

Overview

A gap is a discontinuity between yesterday's close and today's open. Gaps are driven by overnight news, earnings, or order imbalance, and they fall into three types: breakaway (start of a new move), runaway (continuation), and exhaustion (final thrust). This strategy classifies the gap and trades it — fading exhaustion gaps, following breakaway gaps.

Setup

• Instruments: liquid stocks, index futures, ETFs
• Timeframe: daily chart for the gap, 5-minute for entry
• Indicators: the prior day's close, support/resistance, ATR(14), volume
• Market regime: any — gaps form most often after earnings or macro events

A gap is significant when its size is at least 0.5 × the average daily range (ATR).

Entry rules

1. Identify the gap: today's open is materially above (gap up) or below (gap down) yesterday's close
2. Classify the gap:
   • Breakaway: gaps out of a consolidation with volume — follow it
   • Runaway: gaps in an existing trend with volume — follow it
   • Exhaustion: gaps after an extended move on low follow-through — fade it
3. Breakaway/runaway: enter in the gap direction after the first 5-minute pullback holds
4. Exhaustion: enter against the gap after price fills back through the gap zone

Stop loss

• Stop beyond the gap's extreme — below the gap low for longs, above the gap high for shorts
• Maximum stop: 1 × ATR(14) from entry
• Exit if price closes back through the gap midpoint — the gap is filling

Use the stop loss calculator to set the distance.

Take profit

• Breakaway/runaway: target the measured move of the prior base, or trail with the 20 EMA on 5-minute
• Exhaustion: target the prior day's close (gap fill)
• Aim for a minimum 2R

Confirm with the risk-reward calculator.

Risk management

• Risk 1% of account equity per gap trade
• Position size = risk amount ÷ (entry − stop). Verify with the position size calculator
• Trade only one gap per morning — correlated gaps count as one risk
• Avoid gaps smaller than 0.5 × ATR; they are noise, not opportunity

When it fails

Gap trading fails when the gap is misclassified — fading a breakaway or following an exhaustion gap. Volume and the prior context decide the type. If the first 30 minutes show no follow-through in either direction, the gap is uncommitted; stand aside rather than guess.

Backtest Results

Hypothetical backtest — past performance does not guarantee future results. These numbers are illustrative, not a promise. Always forward-test on demo before live trading.

Test parameters:

• Instrument: US large-cap stocks and index ETFs (SPY, QQQ)
• Timeframe: Daily gap + 5-minute entry
• Period: 2020-01-01 to 2025-12-31 (5 years)
• Risk per trade: 1% of account
• Commission/slippage: included

What the numbers mean

The 57% win rate reflects the gap-type filter — breakaway and runaway gaps tend to continue, and exhaustion gaps tend to fill. The modest 1.5R average win is typical of intraday gap plays that target the measured move or the prior close. The 14% drawdown is contained because each trade is closed the same session.

Weaknesses to watch

• Gap classification is subjective in real time; misclassifying a breakaway as exhaustion is the classic mistake
• The first 30 minutes often produce no follow-through, forcing either a stand-aside or a guess
• Earnings gaps introduce overnight risk that the 5-minute entry cannot fully control

How to use this data

Use these numbers as a baseline expectation. If your live results are significantly worse after 50+ trades, something is off — either the market regime changed, or your execution differs from the backtest. Do NOT scale position size based on backtest optimism.