Gap Fill Strategy

Mean Reversion Strategies Intermediate Singapore STI DBS OCBC UOB SINGTEL SGX Stocks ETFs

Works Best When Gaps Are Emotional Overreactions

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Quick Reference

Strategy Type Mean Reversion / Gap Trading
Market Outlook Works Best When Gaps Are Emotional Overreactions
Risk Profile Defined by Gap High/Low or ATR Stop
Reward Profile Target Previous Close (Gap Fill) or Partial Fill
Time Horizon Intraday to Short-Term (Hours to Days)
Indicator Type Price Gap Analysis
Signal Type Fade Gap Downs; Fade Gap Ups (Trade Against Gap Direction)

Singapore Market Details

Primary Instruments STI ETF, DBS, OCBC, UOB, SINGTEL, CapitaLand, Keppel
Trading Hours 9:00 AM - 5:00 PM SGT
Pre Market 8:30 AM - 9:00 AM SGT (Pre-open matching)
Recommended Timeframes 5-minute, 15-minute for intraday; Daily for swing
Currency SGD
Default Settings Gap size > 1% for significance; Target previous close
Liquidity Note Works best on liquid stocks with regular gap behavior
Typical Holding Period Same day to 3 days

Frequently Asked Questions

What percentage of gaps fill?

Approximately 70% of all gaps eventually fill. Common gaps have higher fill rates (80%+), while breakaway gaps have lower rates (20-30%). About 50% of gaps fill on the same day.

Should I trade every gap?

No. Only trade gaps that pass your filters: no major news, normal volume, 1-3% gap size, and confirmation of reversal. Avoid earnings gaps, high-volume gaps, and breakaway gaps.

Why wait after the open?

The first 15-30 minutes have highest volatility and widest spreads. Waiting allows price to stabilize, reduces slippage, and provides confirmation that the gap will likely fill.

What's the difference between true gap and partial gap?

True gap: Open is beyond previous day's high (gap up) or low (gap down), creating empty space on chart. Partial gap: Open is different from close but within previous range - less significant.

Where should I set my stop loss?

Common stops: Below the gap low (for gap down buys) or 1.5× the gap size below your entry. Example: 1% gap down, stop 1.5% below entry protects against gap extension.

How do I identify gap type?

Common: No news + low volume + within range. Breakaway: Major news + high volume + breaks key level. Runaway: Mid-trend + continues direction. Exhaustion: End of trend + reverses after.

What is opening range breakout entry?

Wait 15-30 minutes to form a range. For gap down: buy when price breaks above range high. For gap up: short when price breaks below range low. Provides confirmation before entry.

How does market context affect gap fills?

In bull markets, gap downs fill more often (buy the dip). In bear markets, gap ups fill more often (sell the rally). In ranging markets, both directions fill well. Trade with market tendency.

What is a partial fill target?

Instead of targeting 100% gap fill (previous close), target 50% or 75% fill. Higher win rate but smaller profits. Useful for larger gaps that may not fully fill.

How do I use technical confluence?

Gap down landing on support, MA, or Fibonacci level = higher fill probability. Gap up hitting resistance = higher fill probability. Confluence adds confidence to the trade.

How do market makers affect gaps?

Market makers have inventory from gap moves. To reduce risk, they may support price on gap downs (long inventory) or pressure on gap ups (short inventory). This order flow contributes to gap fills.

What is gap classification scoring?

Systematic scoring based on factors: +20 no news, +15 low volume, +15 against trend, +15 at S/R, +10 small size, +10 reversal candle, -20 high volume, -15 with trend, -30 earnings. Score >50 = trade.

How do I use options for gap trades?

Gap down: Buy calls or sell bull put spreads. Gap up: Buy puts or sell bear call spreads. Benefits: defined risk, leverage. Consider elevated IV on gap days and time decay for short-term options.

How many gap trades should I take per day?

3-5 maximum to maintain focus and risk control. Diversify across sectors. Total gap trade exposure shouldn't exceed 10% of portfolio. Quality over quantity.

What metrics should I track?

Fill rate by gap type, average fill time, win rate by market condition, P&L by gap size, maximum adverse excursion. Segment by gap type, size, and market condition for insights.

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