Pre-Market Gap Analysis: Gap Up, Gap Down, and Opening Range Breakout

The Anatomy of Stock Market Gaps

A gap occurs when a security or index opens at a price noticeably higher or lower than its previous session's closing price, leaving an empty space on the price chart.

In Indian equity indices (NIFTY 50 and Bank Nifty), gaps are primarily driven by overnight developments in offshore markets, GIFT Nifty, US economic data, and geopolitical announcements.

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4 Types of Market Gaps & How to Identify Them

1. Common Gap       ──► Low volume, fills quickly during morning hours (Mean Reversion).
2. Breakaway Gap    ──► High volume, breaks multi-week consolidation, NEVER fills quickly.
3. Runaway / Measuring Gap ──► Mid-trend acceleration, signals powerful trend continuation.
4. Exhaustion Gap   ──► Climax move into overbought/oversold extremes; precedes sharp reversal.

1. Common Gaps (Range-Bound Gaps)

• Characteristics: Occurs within an established sideways consolidation range with average or low volume.
• Trading Action: Fading the gap is highly profitable. Expect price to revert back to previous day close within the first 60–90 minutes.

2. Breakaway Gaps

• Characteristics: Price gaps beyond a multi-week resistance or support level accompanied by heavy institutional volume.
• Trading Action: Never attempt to fade a breakaway gap. Trade strictly in the direction of the breakout with tight stop losses below the breakout zone.

3. Runaway Gaps (Measuring Gaps)

• Characteristics: Occurs in the middle of a powerful established trend. It signifies a sudden surge of buyer/seller urgency following decisive news.
• Trading Action: Enter on minor 5-minute pullbacks towards the intraday Volume Weighted Average Price (VWAP).

4. Exhaustion Gaps

• Characteristics: Occurs after a prolonged multi-day rally or severe sell-off. The market gaps open aggressively, but fails to make new highs after the opening 5 minutes.
• Trading Action: Look for reversal candlestick patterns (Bearish Pin Bar, Engulfing) to capture the counter-trend retracement.

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Gap Classification Matrix

Gap Type	Volume Signature	Location on Chart	Expected Outcome	Preferred Trading Style
Common Gap	Normal / Low	Inside trading range	85% probability of filling	Mean Reversion (Fade)
Breakaway	Extremely High	Beyond major support/resistance	<15% probability of filling	Trend Following
Runaway	Above Average	Middle of strong trend	Continuation without fill	Pullback Buying / Selling
Exhaustion	High Climax Volume	Near technical extremes / Overbought	Immediate sharp reversal	Reversal Trading

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The Golden Rules of Gap Trading

1. Wait for the 09:20 AM Candle: Never execute market orders at 09:15:01 AM. The initial 5 minutes are dominated by retail market orders and automated stop-loss triggers.
2. Check India VIX: If market gaps up by +100 points but India VIX also rises by +4%, caution is warranted—institutions are buying Put option protection against the gap.
3. Always Respect the Previous Day's High/Low: PDH and PDL serve as the most heavily defended liquidity pools on the chart.