🚀 Breakouts and gaps: real moves, false starts and earnings jumps

🎯 In 30 seconds: A breakout is when price closes beyond a level that has held before, such as the top of a range. Breakouts can start big moves, but many fail and snap back. Signs of a stronger breakout are a decisive close, above-average volume and follow-through. A gap is a jump between one bar's range and the next, usually overnight. Gaps come in four classic types (common, breakaway, runaway, exhaustion), and "gaps always fill" is a myth. The most important lesson: a stop order cannot protect you from a gap. Size positions for the gap, not just the stop.

What a breakout is

A breakout happens when price moves and closes beyond a level that has contained it: the top of a trading range, a pattern's neckline, a trendline, or a prior high. A breakdown is the same thing on the downside.

Breakouts matter because of what sits at those levels. Stop-loss orders from short sellers rest just above resistance, and buy-stop orders from traders waiting for a breakout rest there too. When price reaches the level, those orders turn into market buys, which can push price further. A New York Fed study of a currency dealer's orders found that stop-loss orders tend to make moves accelerate once a level is crossed.

The same mechanism explains failures. Once the stop orders are filled, there may be no one left to keep buying. Price drifts back inside the range, and everyone who bought the breakout is now holding a loss.

Strong breakouts vs false breakouts

A false breakout (or failed breakout) moves through the level and then closes back inside within a few bars. There is no way to know in advance which breakouts will hold, but traders look at a few clues:

• The close. A bar that closes well beyond the level is stronger than one that pokes through intraday and closes back.
• Volume. A breakout on volume well above the recent average shows real participation. A breakout on light volume is easier to reverse. See Volume.
• Follow-through. Real breakouts usually keep going the next day or two. A breakout that stalls immediately is a warning.
• The base. A long, tight range before the breakout means many traders are watching the same level. Volatility often contracts before a strong breakout (see the squeeze in Volatility tools).
• The bigger trend. A breakout in the direction of the weekly trend has the wind behind it. One against the trend is fighting it. See Using multiple time frames.

Buy the breakout or the retest?

There are two common ways to enter:

• Breakout entry: buy on the close above the level (or with a buy-stop order just above it). You never miss a strong move. You also get caught in every false breakout.
• Retest entry: wait for price to pull back to the broken level and hold. Your stop can be tighter, just below the level. But many strong breakouts never come back, so you miss some of the best moves.

Worked example (hypothetical, from the figure): account $10,000, risk 1% ($100) per trade.

The retest looks much better on paper. The catch: you only get that trade when a retest happens. Some traders split the difference, buying half at the breakout and half on a retest if it comes.

What a gap is

A gap is a price area where no trading happened, because one bar's range does not overlap the previous bar's. On a daily chart, a gap up means today's low is above yesterday's high. Most gaps happen overnight, when news arrives while the regular market is closed: earnings, guidance, a deal, a court ruling, economic data, or news from markets in other time zones.

Gaps can also appear after a trading halt, when an exchange pauses trading in a stock (for example, pending news) and it reopens at a different price.

The four classic gap types

• Common gap: a small gap inside a range or on low volume, often with no special news. These often fill (price returns to the pre-gap level) within days.
• Breakaway gap: a gap out of a range or pattern, often on news and heavy volume. It is a breakout that happened overnight. These are the gaps least likely to fill soon, because they reflect new information.
• Runaway (continuation) gap: a gap in the middle of an established trend, showing the trend is still accelerating. Some traders use it to estimate how far the trend might run.
• Exhaustion gap: a gap late in a long move, often on very heavy volume, after which the move stalls or reverses. You usually only know it was an exhaustion gap after the fact.

The labels are descriptions, applied mostly in hindsight. When a gap happens, you rarely know which type it is. Context (where in the trend, what news, how much volume) is the only guide.

Earnings gaps

Earnings reports are the most common cause of big gaps in individual stocks. Companies usually report before the market opens or after it closes, so the reaction shows up as a gap at the next session's open. Opening moves of several percent are routine for individual stocks after earnings, much larger ones happen, and they can go against even a well-chosen trade. A stock can also gap down on a "beat" if guidance disappoints. See Earnings season.

Check the earnings calendar before every trade. Holding through earnings is a separate decision, with its own position size.

The gap-fill myth

You will hear "gaps always fill." Some do, and given enough years most price levels get revisited. But as a trading rule it is unreliable. Breakaway gaps after major news can leave price far from the gap for months or years, and a trader shorting a gap up because "it must fill" can lose heavily while waiting. Treat gap fills as one possibility to plan for, not a law.

Why your stop cannot protect you from a gap

A stop order is not a guaranteed price. When it is triggered, it becomes a market order, and it fills at the next available price. FINRA has warned that in fast markets the fill can be far from the stop price.

Worked example (hypothetical): you buy 90 shares at $50.00 with a stop at $47.80, planning to risk $2.20 x 90 = $198. Overnight the company reports bad news and the stock opens at $44.10.

The actual loss was 2.7 times the plan. A stop-limit order would not have helped: with a limit at, say, $47.50, it would not fill at all, and you would still hold the stock at $44.10.

What you can do: hold smaller positions through known events like earnings, avoid putting too much of your account in one stock, and remember that 1% risk per trade is a plan for normal days, not for gap days. More in Stop losses.

What the evidence says

A classic study of the Dow Jones index from 1897 to 1986 found that buying when price broke above its recent trading range carried information, alongside moving average rules. A larger follow-up that tested nearly 8,000 rule variations found the best rules from that period did not keep working significantly in 1987 to 1996. Breakout trading is also a core part of trend following, where evidence is stronger across diversified baskets of markets than for single stocks (see Trend following).

Breakout trading also tends to come with a low win rate: many small losses from false breaks, paid for by fewer, larger wins. If you cannot sit through five false breakouts in a row, you will quit right before the one that works. Drawdowns and losing streaks covers that.

Try it

1. Find three stocks in tight ranges using the stock screener and the charts. Mark each range's top and bottom.
2. Set a price alert just above each range top.
3. When one triggers, note the volume relative to average and whether it closed above the level. Track the next ten days: did it follow through, retest, or fail?
4. Look up the last four earnings dates for a stock you follow and measure each opening gap as a percentage of the prior close. That is the kind of move your position size must survive.
5. Practice both entry styles in the paper portfolio.

Sources

• Federal Reserve Bank of New York: Osler, Currency Orders and Exchange-Rate Dynamics: Explaining the Success of Technical Analysis (Staff Report 125)
• FINRA: Regulatory Notice 16-19, Stop Orders (2016)
• RePEc: Brock, Lakonishok and LeBaron, Simple Technical Trading Rules and the Stochastic Properties of Stock Returns (Journal of Finance, 1992)
• LSE Financial Markets Group: Sullivan, Timmermann and White, Data-Snooping, Technical Trading Rule Performance, and the Bootstrap