Price Gaps — 4 Types You Must Tell Apart (Breakaway, Runaway, Exhaustion, Common)

A gap is the simplest piece of information a market can leave on a chart: empty space where not a single trade occurred, because the imbalance between buyers and sellers was too large. The problem is that four different gaps look identical while meaning four different things — from meaningless noise to a signal the trend is ending. On top of that comes the most damaging myth in technical analysis: "a gap always fills." This article is the pillar of our gap cluster — it sorts out the types, shows how to tell them apart, and dismantles the myth with measurement.

How to Identify a Gap and Its Type

A gap forms when price opens outside the range of the previous candle: on an up gap, the low of the new session sits above the high of the previous one; on a down gap, the high of the new session sits below the low of the previous one. What's left on the chart is empty space. The classic taxonomy splits gaps into four types — and you tell them apart not by shape (that's identical) but by where they sit in the structure of the move and by volume.

1. Common Gap

Forms inside consolidation, without significant news, usually on low volume. It's noise: a momentary order imbalance, sometimes a technical artifact. It fills quickly — typically within a few sessions — and it's exactly this gap that keeps the "a gap always fills" myth alive, because common gaps are by far the most numerous on any chart. Trading value: none. Learning to recognize it matters mainly so you don't confuse it with something that actually matters.

2. Breakaway Gap

The most important of the four. Forms when price breaks out of consolidation or a formation (a range, a triangle, a base) on clearly elevated volume. This isn't noise — it's the start of a new trend: the market changed its mind so violently it never got to trade at the intermediate prices. A breakaway gap backed by volume often doesn't fill for a long time — waiting for it to fill is one of the most expensive gap-trading mistakes. The gap's edge and the breakout level become support (on an up gap) or resistance (on a down gap). A breakaway gap that exits a proper formation (say, an ascending triangle) is stronger than a gap with no structure behind it.

3. Runaway Gap (Measuring Gap)

Appears in the middle of a trend that's already running, on elevated volume. The mechanics: late traders were waiting for a pullback, the pullback never came, and they finally capitulate and buy at market — price jumps. A runaway gap confirms trend strength and usually stays unfilled for a long time. It's also called a measuring gap: by the classic rule, it falls roughly halfway through the move, so it lets you estimate the move's extent — the distance from the start of the trend to the gap, projected from the gap in the trend's direction, gives an approximate target. Treat that as an estimate, not a promise.

4. Exhaustion Gap

The dying trend's last gasp. Appears after a long, stretched-out move, on extremely high volume and often on a large candle — it looks like euphoria, and that's exactly what it is: the last buyers (or, in a downtrend, the last panicking sellers) pile in all at once. Demand runs out, price reverses, and the gap fills quickly — that's its signature. It's easy to mistake for a runaway gap; the difference is context (the move is already heavily stretched) and what happens afterward. If price then leaves in the opposite direction with its own gap, leaving an "island" of prices behind — that's an island reversal, a strong reversal pattern.

What the Numbers and Measurement Say — Not Opinions

There's no single Bulkowski-style table for gaps the way there is for chart patterns — but measurement and classic literature agree on a few hard points:

• Common gaps usually fill within days, at most weeks. No conviction behind them means a quick return to the mean.
• Exhaustion gaps fill almost always, and fast — a quick fill is practically part of the definition, and it's a reversal signal in itself.
• Breakaway and runaway gaps often do NOT fill quickly. Real demand or supply stands behind them; price simply keeps moving.
• A universal "fill rate" doesn't exist. The share of gaps that fill depends on the type, its size, the volume, the market and the measurement horizon. Anyone quoting a single number — "X% of gaps fill" — without those caveats is selling a guess dressed up as statistics. The honest version is: over an "eventually" horizon, most gaps really do fill — but "eventually" isn't a horizon you can trade.
• Gaps matter more on higher timeframes. A gap on the weekly chart (Friday's close vs. Monday's open) is rare and carries real information; intraday micro-gaps on liquid markets are just ordinary volatility.

Crypto context, because here the caveat runs deeper than usual: BTC/ETH spot trades 24/7, so classic opening gaps barely exist. You will see gaps, though, on CME futures, which don't trade on weekends — hence the famous "CME gaps" on BTC, which the market is happy to fill (though not always and not immediately — the myth works exactly the same way here as it does with stocks). In intraday crypto trading, the role of "empty zones" is instead played by imbalanced areas like the Fair Value Gap and the day/week opening gaps (NDOG/NWOG) from ICT methodology — a different definition, the same imbalance logic. The classic four-gap taxonomy works best where it comes from: US stocks, the daily timeframe.

How to Trade Gaps

1. Name the Type First, Then Look for an Entry

The whole game with gaps comes down to one decision: continuation or return? You trade breakaway and runaway gaps with the move, you ignore common gaps, and you can cautiously fade an exhaustion gap (play for the fill). A trade without naming the type first is a trade on a pretty picture.

2. Gap-and-Go — Playing the Breakaway Gap

Setup: a gap breaks out of consolidation on volume clearly above average and holds above the breakout level. Entry: after confirmation (the gap edge holds / the first candle closes without filling it). Stop: below the lower edge of the gap or below the breakout level — a filled breakaway gap with price back inside consolidation invalidates the thesis. Target: the measured move of the formation the breakout came from (the measure rule), or the next resistance level.

3. Playing the Fill — Only on Exhaustion

Setup: the market after a long rally, a gap on climactic volume, no continuation on the following candles. Entry against the trend, in the direction of the fill; stop beyond the extreme of the candle after the gap. This is a contrarian play — without confirmation of weakness (say, a candle closing back under the gap) it's catching a falling knife with a justification attached.

4. A Gap as a Level

An unfilled gap isn't just a signal — it's a support/resistance zone. The gap's edges, and the level price bounced from, act as support or resistance on later approaches. An up gap that price later punches straight through and closes below is a serious warning that nothing durable stood behind the move.

5. Gap-Reading Checklist

1. Where is the gap? Inside consolidation → common. On the break from a base/formation → breakaway. In the middle of a trend → runaway. After a long, stretched move → exhaustion.
2. What was the volume on the gap candle? Low → noise. Clearly elevated → a real move. Climactic after a long rally → warning.
3. What do the next 2–3 candles do? Holding above the gap confirms continuation; a quick return into the gap reveals exhaustion.
4. Does the type match the play you're planning? Trade continuation on breakaway/runaway, trade the fill only on exhaustion, skip common gaps entirely.

⚠ The most expensive gap mistake: shorting a breakaway gap "because gaps always fill." Fading a breakout on high volume means trading against everyone who just changed their mind about fair value — and the bill for that trade can keep growing for weeks.

Myth vs. Measurement: "A Gap Always Fills"

Myth: "A gap always fills — every gap is a magnet, price always comes back for it. Just trade the fill."

Measurement: the myth survives on a selection bias. Common gaps are the most numerous on any chart, and those really do fill almost every time — so the observer remembers "gaps fill." But common gaps aren't tradeable, and the gaps you can actually make money on (breakaway, runaway) are precisely the ones that fill least often and latest. The result: a "trade every gap fill" strategy systematically ignores the best continuation signals, shorts the strongest breakouts, and collects small wins on noise while risking big losses on real trends. The exact opposite of a sound approach.

Once you measure it, the truth looks like this: the type of gap, the volume and its place in the trend decide everything. A gap without those three readings is just a hole in the chart. With them, it's one of the cleanest pieces of information the market ever leaves behind.

FAQ

Rafał — Krypto Bez Ściemy

Trader and founder of Strefa Tradingu. He’s been breaking crypto down on YouTube for years — no hype, no signals, with a focus on market structure and risk management.

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