Gap Fill Strategy

Entering at the open is risky because you don't know if the gap will fill or extend. The opening range (first 5-15 minutes) shows you the initial battle between buyers and sellers. If the gap starts fading (filling), then enter. If it extends, you avoided a losing trade. Patience at the open improves win rate significantly.

Partial fills are common. Many traders take partial profits at 50% fill level. If price reaches 75% of the fill but stalls, you've still made money. You can use trailing stops after partial fill or have predefined partial fill targets. Not every gap fills 100%.

No. While studies show ~70% of gaps fill eventually, some never do. Breakaway gaps at the start of major trends may not fill for months or years. The gap fill strategy focuses on gaps that fill QUICKLY (same day or within days), not eventual fills that tie up capital.

For day trading gap fills, use 1-minute or 5-minute charts to identify the opening range and manage the trade. For context, check the daily chart to understand the larger trend and where the gap fits. The actual gap is visible on the daily chart (prior close vs today's open).

Generally NO. Earnings gaps are often breakaway gaps with high volume and fundamental news driving the move. These have lower fill probability and can extend significantly. Stick to non-earnings gaps where the gap is more likely due to sentiment/flow rather than fundamental re-pricing.

Breakaway gaps: (1) High volume (2x+ average), (2) Break out of a pattern or range, (3) Often have news catalyst, (4) Strong follow-through. Common gaps: (1) Normal or below-average volume, (2) Within existing range, (3) No significant news, (4) Weak follow-through. If unsure, wait - breakaway gaps become clear as they don't fill.

Most gap fills occur in the first 60-90 minutes of trading (9:30-11:00 AM ET). If a gap is going to fill same-day, it usually starts early. After 11:00 AM, fill probability decreases. Some late fills happen in the last hour (3:00-4:00 PM) as traders close positions, but this is less common.

Day trading gaps is the standard approach - exit by close. Holding overnight exposes you to new gaps the next day (gap risk). However, if you have strong conviction and the gap is large (>2%), you might hold for multi-day fill. Just understand you're changing the trade character from day trade to swing trade.

If the gap extends beyond the opening range in the gap direction, your fill thesis is likely wrong. Either: (1) Exit at your stop (beyond opening range), (2) Flip to 'gap and go' trade (reverse direction), or (3) Wait on sidelines. Don't fight a gap that's extending - it may be a breakaway gap.

Generally, large-cap stocks and major ETFs (SPY, QQQ) show consistent gap fill behavior due to arbitrage and mean reversion forces. High-beta tech stocks may have more extreme gaps that don't fill quickly. Avoid gap fills in low-liquidity small caps where gaps can be due to thin trading.

Steps: (1) Collect gap data (size, type, volume, outcome) for your universe over 2+ years. (2) Analyze fill rates by segment (size buckets, volume levels, market context). (3) Develop rules based on highest-probability segments. (4) Backtest with realistic assumptions (slippage, commissions). (5) Walk-forward validate on out-of-sample data. (6) Paper trade before live.

For defined risk with leverage: ATM or slightly OTM options with 0-7 DTE. If IV is elevated (common after gaps), use vertical spreads to reduce vega. For conservative approach: ITM options with high delta (0.70+) to closely track stock. For aggressive: OTM options for leverage but accept lower probability of profit.

Daily scan for gaps meeting criteria, rank by fill probability, select top 3-5. Limit directional exposure (not all shorts or all longs). Diversify across sectors. Cap total gap risk at 2-3% of portfolio. Use time stops (exit by close if no fill). Track aggregate performance to ensure edge persists.

Gap fill alpha is relatively stable because it's based on structural market microstructure (overnight order accumulation, overreaction correction). However, returns may compress during low-volatility periods (fewer/smaller gaps). Monitor Sharpe ratio over rolling periods and gap size distribution to detect regime changes.

Weekend gaps (Sunday open vs Friday close) work similarly to daily stock gaps. ES/NQ often gap on geopolitical or macro news over weekends. Enter after first 30-60 minutes of Sunday session to confirm direction. Target: Friday's close. Stop: Beyond Sunday's opening range. Weekend gaps often fill within first 4 hours of Sunday trading.