What is Gap Trading? A Simple Guide

Quick Answer

A gap is a jump between one day’s close and the next day’s open, leaving a blank space on the chart. Gap trading tries to profit from these jumps, either by trading in the gap’s direction or by betting the gap will be filled. Gaps are usually caused by news released when markets are shut.

Sometimes a stock opens far above or below where it closed, leaving a visible gap on the chart. Gap trading is built around these jumps and what tends to happen next.

This guide explains why gaps form, the main ways they are traded, and the risks involved.

Key Takeaways

• A gap is a jump between one close and the next open.
• Gaps are usually caused by overnight news.
• Some traders trade in the gap’s direction.
• Others bet the gap will be filled.
• Gaps can be volatile and hard to predict.

Why do gaps form?

A gap appears when strong buying or selling pressure builds while the market is closed, often from news like earnings or a major announcement. When the market reopens, the price jumps straight to a new level, skipping the prices in between and leaving a gap on the chart.

What are the main ways to trade a gap?

There are two broad approaches. One trades in the direction of the gap, expecting the momentum to continue. The other bets on a gap fill, where the price drifts back to close the empty space, on the idea that the initial jump was an overreaction.

What is a gap fill?

A gap fill happens when the price later moves back to the level it gapped from, closing the empty space on the chart. Many gaps fill eventually, which tempts traders to fade them, but some never do, especially when the news was genuinely important. Judging which is which is the difficulty.

What are the risks?

Gaps come with high volatility and can move fast in either direction at the open. A gap driven by real news may run far without filling, punishing those who faded it, while a weak gap may reverse on those who chased it. Wide swings make stops and small size important.

How is risk managed in gap trading?

Gaps can move fast, so risk control matters greatly. Traders decide in advance whether they are trading the gap to continue or to fill, set a clear stop in case the move goes the other way, and size the position so a sudden reversal does not cause a large loss. Because the opening after a gap can be volatile, some traders wait a short while for the initial swings to settle before entering. Firm stops and sensible sizing keep gap trading from turning a fast move into a fast loss.

Which gaps are most tradable?

Not all gaps are equal. Gaps backed by strong, clear news and heavy volume tend to have more follow-through, making continuation trades more reliable, while small gaps with no obvious cause are more likely to fill. Traders assess the reason behind a gap, the volume, and where it sits relative to key levels before deciding how to trade it. Understanding which gaps are likely to run and which are likely to close is central to choosing the right approach for each one.

Trading and intraday strategies carry a high risk of loss and are not suitable for every investor. This article is educational and is not a recommendation to trade.

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