Gap
Category
Related Terms
Browse by Category
What Is a Gap?
A gap is a discontinuity in a price chart where no trading occurs, typically happening when the opening price of a trading session is significantly higher or lower than the previous session's closing price.
In the continuous flow of market data, a "gap" is a stark interruption. It is an area on a price chart where no trading activity has taken place. Visually, it appears as a vertical empty space between two price bars (or candlesticks). This phenomenon occurs when the market sentiment shifts so dramatically while the market is closed that the opening price for the next session leaps above or dives below the previous session's range. Gaps are essentially a manifestation of supply and demand imbalance. If positive news breaks overnight, buyers may be willing to pay a much higher price at the open than anyone was willing to sell for at yesterday's close. The market "gaps up" to find the new equilibrium price where sellers are willing to transact. Conversely, panic or bad news causes the market to "gap down" as sellers overwhelm the previous price levels, forcing the price to open significantly lower to find liquidity. While gaps are most common in daily charts of stocks (which have set trading hours), they can also appear in other timeframes and assets, though they are rare in highly liquid, 24-hour markets like Forex unless over the weekend. They act as "voids" in the price history that the market often revisits.
Key Takeaways
- A gap represents a price range where no shares changed hands, appearing as a blank space on a chart.
- Gaps usually occur due to overnight news, earnings reports, or economic data released when the market is closed.
- There are four primary types of gaps: Common, Breakaway, Runaway (Continuation), and Exhaustion.
- Traders often look for gaps to be "filled," meaning the price eventually moves back to cover the empty space.
- Analyzing the volume and context of a gap is crucial for determining its significance and potential future direction.
How Gaps Work
A gap is created by the difference between the closing price of one period and the opening price of the next. 1. **Gap Up:** The Low of the current day is higher than the High of the previous day. This indicates aggressive buying interest and a potential lack of sellers at lower prices. 2. **Gap Down:** The High of the current day is lower than the Low of the previous day. This indicates aggressive selling pressure and a potential lack of buyers at higher prices. 3. **Partial Gap:** Sometimes prices open outside the Close but within the previous day's range. While technically a gap in opening price, true "technical gaps" usually refer to a complete void in price overlap. **Why They Matter:** Gaps are significant because they represent new information. The market has repriced the asset instantly. The "Gap Fill" theory suggests that price will often retrace to the original breakout point to "test" the support or resistance. However, relying on this blindly is dangerous. Not all gaps fill, and identifying which will fill (Common Gaps) and which will run (Breakaway Gaps) is the core of gap trading.
The Four Types of Gaps
Not all gaps are created equal. Analysts classify them into four categories based on where they occur in a trend and their subsequent behavior.
| Gap Type | Description | Volume Profile | Trading Implication |
|---|---|---|---|
| Common Gap | Occurs in a trading range; no major news. | Low Volume | Usually fills quickly; ignored by trend traders. |
| Breakaway Gap | Breaks a support/resistance level; starts a trend. | High Volume | Strong signal; usually does NOT fill immediately. |
| Runaway Gap | Occurs in the middle of a strong trend. | Moderate Volume | Confirms trend strength; measures potential target. |
| Exhaustion Gap | Occurs at the end of a trend. | High then Low | Signals trend reversal; fills quickly. |
Common Strategies: Trading the Gap
Traders use specific strategies depending on the gap type: 1. **Gap and Go (Breakaway/Runaway):** If a stock gaps up on high volume and breaks a resistance level, traders buy immediately or on a brief pullback, betting the trend will continue. The gap acts as a "launchpad." 2. **Fading the Gap (Common/Exhaustion):** If a gap seems overextended or lacks fundamental drivers (low volume), traders bet against it. For a gap up, they short the stock, targeting the previous day's close as the profit target (the "gap fill"). 3. **Gap Fill Strategy:** This involves waiting for the price to retrace and "fill" the gap. Once the gap is filled, the previous resistance often becomes support. Traders buy at the fill level, expecting a bounce.
Important Considerations
Trading gaps carries unique risks. The volatility at the market open is extreme. * **Slippage:** Executing orders right at the open can result in poor pricing as spreads widen. * **False Signals:** A Breakaway gap can easily turn into an "island reversal" if the price fails to hold the new level. * **Liquidity:** Ensure the stock has enough liquidity. Gaps in thinly traded penny stocks are often meaningless noise caused by a single large order. * **Earnings:** Gaps caused by earnings are the most violent. They often establish a new price range that can last for months ("Post-Earnings Announcement Drift").
Real-World Example: Earnings Surprise
Consider Stock ABC closing at $50 on Tuesday. After hours, they report double the expected earnings. * Wednesday Open: $55. * The range between $50 and $55 is the Gap.
Common Beginner Mistakes
Avoid these errors when trading gaps:
- Assuming ALL gaps must fill. Strong breakaway gaps can stay open for years.
- Trading common gaps in sideways markets as if they are trend starters.
- Ignoring volume. A gap on low volume is often a "head fake" (trap).
- Placing stop losses too tight within the gap zone where volatility is highest.
FAQs
Filling the gap means the price moves back to the level where the gap originated (the previous day's close). For example, if a stock closes at $100 and gaps up to $105, the gap is "filled" if the price subsequently drops back down to $100.
Gaps are most common in stocks because the stock market has a physical closing time (e.g., 4:00 PM EST) and an opening time (9:30 AM EST). News and events happen during the 17.5 hours the market is closed, causing the price to re-adjust instantly at the next open. 24/7 markets like Crypto see fewer gaps.
It depends on the direction and context. A "Gap Up" is generally bullish short-term, indicating buyer strength. A "Gap Down" is bearish. However, an Exhaustion Gap Up at the end of a long bull run can actually be a bearish reversal signal.
It varies wildly. Common gaps may fill the same day. Exhaustion gaps may fill in a few days. Breakaway gaps may not fill for months or years, if ever. There is no set timeline.
Yes, "Gap and Go" and "Gap Reversal" are two of the most popular day trading strategies. Day traders love gaps because they provide volatility and clear support/resistance levels right at the market open.
The Bottom Line
Traders looking to capitalize on market volatility often focus on the Gap. A Gap is a price void on a chart that signifies a sudden, sharp change in market sentiment, usually triggered by new information while the market was closed. While the visual pattern is simple, the underlying psychology is complex. Understanding the type of gap—whether it is a Breakaway, Runaway, Exhaustion, or Common gap—is critical. A Breakaway gap signals "get in," while an Exhaustion gap signals "get out." The novice mistake is assuming every gap will close (fill). By combining gap analysis with volume and fundamental context, traders can distinguish between a trap and a genuine trend, using these price voids as powerful signals for entry and risk management.
Related Terms
More in Technical Analysis
At a Glance
Key Takeaways
- A gap represents a price range where no shares changed hands, appearing as a blank space on a chart.
- Gaps usually occur due to overnight news, earnings reports, or economic data released when the market is closed.
- There are four primary types of gaps: Common, Breakaway, Runaway (Continuation), and Exhaustion.
- Traders often look for gaps to be "filled," meaning the price eventually moves back to cover the empty space.