In this lesson, you will learn what stock market gaps are, why they happen, and how traders build a <strong>gap trading strategy</strong> around them. You will also learn practical ways to trade <strong>gap up gap down stocks</strong>, how <strong>gap fill trading</strong> works, and how to manage risk before entering a trade.
1. What Is a Gap in Stock Trading?
A <strong>gap</strong> happens when a stock opens at a price that is clearly higher or lower than the previous day’s closing price, leaving an empty space on the price chart.
For example:
A <strong>gap up</strong> means the opening price is above the prior close. A <strong>gap down</strong> means the opening price is below the prior close.
Gaps usually happen because important information comes out when the market is closed. Common causes include:
The key idea is simple: a gap shows that traders have changed their opinion of the stock quickly. Your job is not to guess emotionally. Your job is to decide whether the gap has strength, weakness, or a high chance of reversing.
2. Main Types of Gaps Traders Watch
Not every gap should be traded the same way. A strong gap after major news is different from a small gap with no clear reason. Intermediate traders usually classify gaps into a few common types.
Common gap
A <strong>common gap</strong> is a small gap that often happens without major news. It may appear in quiet trading conditions and can fill quickly. A <strong>gap fill</strong> means price moves back to the level where the gap started.
Example: A stock closes at $30 and opens at $30.40 with no news. If it later drops back to $30, the gap has filled.
Breakaway gap
A <strong>breakaway gap</strong> happens when price gaps out of a trading range. A <strong>trading range</strong> is an area where price has been moving sideways between support and resistance. <strong>Support</strong> is a price area where buyers often step in. <strong>Resistance</strong> is a price area where sellers often appear.
Example: A stock has traded between $40 and $45 for three weeks. It opens at $48 after strong earnings and volume is much higher than usual. This may be a breakaway gap because buyers are pushing price into a new range.
Continuation gap
A <strong>continuation gap</strong> happens during an existing trend. If a stock is already moving up and gaps higher again, it may show that the trend is still strong. These gaps can be risky because the stock may already be extended, meaning it has moved far in one direction without much rest.
Exhaustion gap
An <strong>exhaustion gap</strong> happens near the end of a strong move. It can look powerful at first, but then price reverses. This often traps late buyers in a gap up or late sellers in a gap down.
Example: A stock rises from $20 to $35 in two weeks, then gaps to $39 on heavy excitement but quickly falls below the opening price. That may be an exhaustion gap.
3. Gap Fill Trading: When Price Returns to the Gap
<strong>Gap fill trading</strong> is a strategy based on the idea that some gaps are later “filled,” meaning price returns to the previous closing price or the start of the gap.
A gap fill is not guaranteed. Strong news gaps may continue in the same direction for days or weeks. Weak gaps, especially those without strong volume, are more likely to fill.
<strong>Volume</strong> means the number of shares traded. High volume shows strong participation. Low volume can mean the move has less support.
A basic gap fill trading plan may look like this:
1. Find a stock that gaps up or gaps down at the open.
2. Check the reason for the gap.
3. Watch the first 5 to 30 minutes of trading.
4. Look for signs that the opening move is failing.
5. Enter only if price starts moving back toward the prior close.
6. Place a <strong>stop-loss</strong>, which is an order or planned exit used to limit losses.
7. Target the prior close or a nearby support or resistance level.
Example of a gap up fill:
The risk in this trade is that buyers may return and push price higher. That is why the stop-loss might be placed above the morning high, such as $86.60 or $87, depending on the trader’s plan.
Example of a gap down fill:
This setup works best when the gap is not caused by major damage to the business. A gap down after bankruptcy news, fraud claims, or a large earnings miss may keep falling and should be treated with extra caution.
4. Building a Practical Gap Trading Strategy
A good <strong>gap trading strategy</strong> should be written before the trade begins. You need rules for scanning, entry, stop-loss, target, and position size.
Step 1: Scan for gap up gap down stocks
Before the market opens, many trading platforms can show <strong>gap up gap down stocks</strong>. Focus on stocks with:
The <strong>spread</strong> is the difference between the bid price and ask price. The bid is the highest price buyers are offering. The ask is the lowest price sellers are asking. A wide spread can make trading more expensive.
Step 2: Identify the gap size
Compare the gap to the stock’s normal movement. A $2 gap may be huge for a $10 stock but small for a $500 stock.
Many traders use <strong>Average True Range</strong>, or <strong>ATR</strong>, which measures how much a stock usually moves in a day. If a stock has a daily ATR of $3 and gaps $6, the gap is large compared with normal movement.
Step 3: Wait for confirmation
Avoid entering only because the stock gapped. Wait to see how price behaves after the open.
Useful confirmation signs include:
Step 4: Define risk before entry
Before entering, decide:
For example, if you buy at $52 with a stop-loss at $50.80, your risk is $1.20 per share. If your target is $55.60, your reward is $3.60 per share. That gives a <strong>risk-reward ratio</strong> of 1:3, meaning you risk $1 to potentially make $3.
A practical rule is to avoid trades where the potential reward is smaller than the risk unless you have a very strong reason.
5. Practical Examples and Risk Rules
Example A: Strong gap up continuation
A company reports earnings before the open. Revenue and profit are much better than expected. The stock closes at $60 and opens at $66 on high volume.
A trader does not buy immediately. They wait 20 minutes. Price pulls back to $65 but does not fall below it. Then it breaks above $67 with rising volume.
Possible plan:
This is not gap fill trading. It is a continuation trade because the trader expects the gap to keep moving higher.
Example B: Weak gap up that fills
A stock closes at $42 and opens at $44 after minor news. It quickly fails near $44.20. The br