Gaps are some of the most information-dense events on a price chart. They represent what happened when the market was closed — news, earnings, macro data — and the collective reaction when it reopened. Knowing how to read them can give you an edge before you've placed a single trade.
The mistake most traders make is treating all gaps the same. Some gaps fill the same day. Others become support for months. The difference isn't luck — it's the type of gap, the context it formed in, and what volume tells you about conviction.
The Four Types of Gaps
Common gaps
These happen frequently, often in low-volatility periods, and almost always fill quickly. A stock bounces a dollar higher for no particular reason. These aren't worth trading as gap plays. They close fast and have no predictive value for direction.
Breakaway gaps
These are the important ones. A breakaway gap occurs when a stock leaves a consolidation zone or pattern and opens beyond a key level. Usually triggered by earnings, news, or a major catalyst. Volume is high. The gap rarely fills quickly because it represents a genuine repricing of the stock.
These gaps often become strong support (or resistance on the downside). Traders who miss the initial move sometimes wait for a pullback to the gap level and buy there — which is a legitimate strategy.
Runaway (continuation) gaps
These happen mid-trend, after the initial move is well underway. The stock is already in a strong uptrend, gaps up one morning for no big reason, and keeps going. Volume is moderate. These signal that the trend is still strong, but they're harder to trade because you're late into the move. The measured move target: take the distance from the trend's start to the gap, and project it forward from the gap.
Exhaustion gaps
These look like runaway gaps but occur at the end of a trend. High volume, big price move — but it's the final gasp. The stock often closes near the low of the day and reverses sharply within days. Distinguishing exhaustion from runaway requires watching price behavior in the days following the gap.
The fill rule: Common gaps almost always fill. Breakaway gaps rarely fill quickly. If a breakaway gap is "filled" the same week, it's a warning sign that the move lacked conviction. Watch the reaction at the top of the gap as a key level.
Gap and Go: Trading the Breakaway
The gap and go strategy is one of the most popular day trading setups. The stock opens with a large gap up on heavy volume, consolidates for 15-30 minutes (often forming a small flag or base near the open), then breaks higher. You trade the breakout of that opening consolidation.
Fade the Gap: Trading the Fill
Fading a gap means betting it will close. A stock opens up 3% on no news, just overnight futures noise — fade traders short at the open expecting it to give back the gap.
This works on common gaps in range-bound stocks. It's dangerous to fade breakaway gaps on earnings. The best fades are:
- Small gaps (under 2%) with no news catalyst
- Stocks that have a history of fading intraday gaps
- Gaps that open at a known resistance level or previous high
Don't fade large gaps on strong catalysts. Trying to short an earnings beat that gaps up 10% is fighting the market with no edge.
Gap Support and Resistance
Once a gap forms and fails to fill for a week or more, it tends to become an important level. The top of the gap is support for long positions. The bottom of the gap is resistance if the stock falls back to it from above.
This is why swing traders pay attention to "gap zones" — the price range inside the unfilled gap. When a stock pulls back toward a gap zone on light volume and bounces, that's a high-conviction support trade.
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