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Overview

A price gap (Gap) refers to a “vacuum zone” between two adjacent trading days— that is, the day’s high is below the next day’s low (the opposite for an upside gap), so there is simply no trading in the price range in between, and a clear “blank” appears on the candlestick chart. Why are gaps worth discussing on their own?
  • They often imply a sudden imbalance in sentiment: buying/selling becomes one-sided
  • Many major trend starts, accelerations, and endings are accompanied by certain types of gaps
  • For traders, gaps are both:
    • Opportunity: ride the trend “with the wind”
    • Risk: overnight gaps can make stop-losses effectively useless
In classic technical analysis, gaps closely tied to trends are roughly grouped into three types:
  • Breakaway Gap
  • Runaway/Measuring Gap
  • Exhaustion Gap
This section focuses on clarifying:
  1. Where each type tends to appear in a trend
  2. What kind of sentiment and capital behavior it represents
  3. How to make trading decisions in conjunction with trend and volume

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Gap Types

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Breakaway Gap

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1. Characteristics and location

A breakaway gap typically appears:
At the moment a key range or pattern is decisively broken, marking “the old structure is broken and a new trend begins.”
Typical features:
  • Where it occurs:
    • At the top/bottom of a long consolidation range
    • Near key support/resistance levels
    • At the breakout point of classic patterns (boxes, triangles, head-and-shoulders top/bottom, etc.)
  • Gap size:
    • Usually larger than normal intraday volatility
    • Often a “full gap” that jumps completely beyond the prior day’s high/low
  • Volume:
    • Significantly higher volume → consensus forms around the new direction; capital rushes in/out
  • Follow-through:
    • Usually not easily filled quickly in the short term
    • The gap area tends to become a new support/resistance band
Simple intuition:
Breakaway gap = the market collectively declares: “Trading in that prior price zone no longer matters—we’ve moved to a new step.”

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2. Sentiment and meaning

  • Upside breakaway gap:
    • Bulls finally break out of the waiting game and rush in to accumulate
    • Shorts and sidelined money are forced to chase higher or stop out
  • Downside breakaway gap:
    • Bull confidence collapses; some cut positions and exit
    • New shorts rush in; buying interest drops noticeably
What it means for traders:
  • A clear signal of trend initiation/acceleration
  • The gap’s upper/lower edge can serve as:
    • initial stop-loss/take-profit reference levels
    • a support/resistance confirmation zone on later retests

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Runaway Gap (Measuring Gap)

A runaway gap is also called a “runaway gap / measuring gap.”

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1. Location: mid-trend

Unlike breakaway gaps, runaway gaps typically:
  • appear after a trend has already traveled some distance
  • sit somewhere in the middle of an uptrend/downtrend
Common scenario:
  • A rally has been underway for a while; most participants are bullish, but some remain sidelined
  • One day the sidelined crowd loses patience: “Forget the pullback—just buy now!”
  • Result:
    • Price jumps forward again mid-trend
    • Volume expands, but it’s not necessarily a “milestone” breakout level

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2. Features and measuring meaning

Typical features:
  • Location: clearly mid-trend, not at the start or the end
  • Volume: usually higher, reflecting “add-on buying with the trend” or “panic exits”
  • After the gap: price most often continues in the trend direction for a while, rather than filling immediately
The so-called “measuring” meaning:
In some textbooks, a runaway gap is thought to occur near the “midpoint” of a trend, so it can be used to roughly estimate the subsequent price target.
For example (illustrative only):
  • A stock rises from 10 to 16 and forms a runaway gap along the way
  • A common rule of thumb:
    • Estimated total move ≈ (move from the start to the gap) × 2
    • If the move from 10 to pre-gap is 4, the total might be around 8
    • So a rough target might be near 18 (a “measuring reference,” not a precise target)
In practice, what matters more:
  • After a runaway gap → higher probability of trend continuation
  • But as runaway gaps keep appearing, be alert to:
    • whether the trend is becoming overstretched
    • whether the next gap could turn into an exhaustion gap

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Exhaustion Gap

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1. Location: the “final jump” near trend end

An exhaustion gap usually appears after a long trend when sentiment is highly extreme:
  • Near the end of a long uptrend:
    • bulls make a final frantic buying push
    • the stock “takes off at the open,” forming an upside gap
  • Near the end of a long downtrend:
    • panic selling peaks
    • the market opens sharply lower with a downside gap
Typical features:
  • Location: at the end of a trend
  • Volume: often with extremely high volume (like a “buying/selling climax”)
  • Follow-through:
    • usually fills quickly
    • instead of making new highs/lows, price starts ranging or reversing
One-sentence summary:
Exhaustion gap = the “last breath” of a trend. Bulls and bears complete a final major handoff here, and the trend’s energy is used up.

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2. Easily confused with runaway gaps

At the moment it appears, it’s hard to distinguish whether it’s:
  • a runaway gap that keeps accelerating
  • or an exhaustion gap that precedes reversal
You usually need to watch the next few days:
  • If price continues to advance steadily after the gap:
    • more likely a runaway gap
  • If price quickly stalls or reverses:
    • and the gap is fully filled soon → likely an exhaustion gap
That’s why, in practice, judging a gap’s nature can’t rely on the gap day alone; you must update the read dynamically with subsequent price action.

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Core Concepts

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1. A gap = a “price vacuum where no one is willing to transact”

From the definition:
  • Upside gap:
    • Today’s low > yesterday’s high → the in-between prices are where “no one is willing to sell that cheaply”
  • Downside gap:
    • Today’s high < yesterday’s low → the in-between prices are where “no one is willing to buy that expensively”
This implies:
  • Market sentiment shifted violently across that price zone
  • Either buyers are extremely dominant, or sellers are one-sided

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2. “All gaps must be filled” is a misconception

A common saying is: “Gaps will be filled sooner or later.” A more accurate view:
  • Common gaps (small, no major news, occurring in ranges):
    • are very likely to be filled in the short term
  • Breakaway gaps & runaway gaps:
    • often remain unfilled for a long time and may become key support/resistance
  • Exhaustion gaps:
    • are usually filled quickly, often alongside trend reversal
So:
Don’t assume “fill the gap” the moment you see one— the key is to first identify what type of gap it is.

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3. Volume is the “gap decoder”

For the same-looking gap, different volume can imply very different meanings:
  • Breakaway gap:
    • high-volume breakout of a pattern/range → trend initiation signal
  • Runaway gap:
    • trend-following volume expansion → mid-trend acceleration; continuation is more likely
  • Exhaustion gap:
    • extreme volume + fading follow-through → trend energy depleted; reversal becomes likely
A simple memory aid:
“Low-volume gaps are often unreliable; high-volume gaps deserve attention. But if volume is too extreme and the gap shows up near the end, beware—it may be the final blow.”

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4. Type = trend position + subsequent behavior

To judge the gap type, focus on three things:
  1. How long has the prior move lasted?
    • just breaking out of a range → more likely breakaway
    • already moved a long way → could be runaway or exhaustion
  2. Where is it in the trend?
    • mid-trend → favors runaway
    • near the end → watch for exhaustion
  3. How do the next few candles behave?
    • continuation and the gap stays unfilled → runaway
    • quick stalling/reversal and gap fills soon → exhaustion

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Practical Applications

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Case 1: Breakaway gap + retest confirmation

Scenario:
  • A stock ranges between 10–12 for months
  • One day, positive news hits:
    • it opens high at 12.8, completely above the box
    • a high-volume bullish candle closes at 13.5, leaving a clear breakaway gap
Possible strategy idea:
  1. Treat the gap’s upper edge (near the prior high, e.g., 12) as a new support zone
  2. Don’t blindly go all-in on the gap day
  3. Wait for a 1–3 day retest:
    • if price pulls back toward ~12–12.3, volume dries up, and candles stabilize
    • you can build a long position in tranches in that zone
  4. A stop-loss can be set such that:
    • if the gap is fully filled and the close drops back into the range, the breakout may be false—exit decisively
The core idea:
Breakaway gap = trend start signal, retest without filling the gap = breakout confirmation.

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Case 2: Using runaway gaps to gauge trend room

Scenario (uptrend):
  • An index rises from 3000 to 3400 in a relatively steady move
  • One day an upside runaway gap appears:
    • it opens directly at 3450
    • rallies throughout the day, closing at 3500
    • volume expands clearly, while the trend remains in the mid-section of a healthy rising channel
A simple “measuring” approach (illustrative):
  • Move from start (3000) → pre-gap (3400) = 400 points
  • Rough estimate:
    • the move may continue by a similar magnitude
    • an initial target could be around 3800
  • In practice, you can:
    • use the gap’s lower edge as a mid-trend support reference on pullbacks
    • as long as price stays above that zone, treat the trend as intact
Of course, this is only an auxiliary reference, not a guarantee that price “must” reach it.

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Case 3: Taking profits and reversal opportunities after an exhaustion gap

Scenario (late-stage uptrend):
  • A hot theme stock is pumped from 20 to 50—massive gains
  • One day it gaps up to 55 at the open, forming a large gap
  • Intraday it spikes to 57, but sells off into the close, finishing at 52
  • Volume prints an all-time record, and in the following days:
    • price chops and weakens
    • within a week it returns to the gap’s lower edge near 50 or even breaks below
This is likely a classic exhaustion gap + topping structure. Trade ideas:
  • For longs:
    • seeing a high-level, huge gap on extreme volume + failure to keep pushing higher, consider taking profits in tranches—don’t fantasize about “doubling again”
  • For aggressive shorts/hedgers:
    • on rebounds that fail near the gap’s upper edge, try small short positions
    • use the gap high or the exhaustion day’s high as a strict stop level
Key logic:
An exhaustion gap tells you: “The last wave that rushed in is often the bagholder flow.” There’s no need to fight to be the final baton holder.

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Common Questions

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Q1: Will all gaps be “filled”? Can I trade a dedicated “gap fill” strategy?

No. And it’s not recommended to treat “gap filling” as a standalone strategy. A rough framework:
  • Common gaps:
    • many are filled within days to weeks
  • Breakaway gaps, runaway gaps:
    • many remain unfilled for a long time and instead become key support/resistance
  • Exhaustion gaps:
    • are often filled quickly during reversal
The problem with “gap fill only” is:
  • If you treat a breakaway/runaway gap—which often should not fill—as “must fill,” you may repeatedly short tops against strong trends, and losses can compound badly
A safer approach:
  • First estimate the gap type (trend context, location, volume)
  • Consider “gap-fill trades” only when there’s clear exhaustion + late-stage trend
  • Otherwise, prefer trading with the trend rather than betting “the gap must fill”

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Q2: How do I distinguish a runaway gap from an exhaustion gap in real trading?

Honestly: it’s hard to be 100% sure in real time—it’s more about probabilities. You can reference a few dimensions:
  1. Trend position
    • mid-trend → favors runaway
    • extended multi-session surge/drop with large divergence → exhaustion probability rises
  2. Next 2–3 days’ price action
    • continuation with the gap staying unfilled → likely runaway
    • quick stalling or reversal with a fast fill → more like exhaustion
  3. Volume structure
    • runaway gap: expanded but still relatively “healthy” volume
    • exhaustion gap: record/extreme volume near the end of a long trend
A practical mindset:
Treat the first gap as “runaway” by default, and once follow-through clearly fails and the gap fills quickly, promptly switch to an “exhaustion” interpretation. The key is fast adaptation, not insisting on “who was right from the start.”

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Q3: The gap is huge and it feels like I “missed it”—is it still suitable to chase?

It depends; you can’t generalize. A quick type-based view:
  • Breakaway gap:
    • if it breaks out from a long base/important pattern on higher volume:
      • consider a “breakout + retest” plan: don’t chase on the most extreme day; wait for a low-volume pullback to the gap’s upper edge to re-enter
  • Runaway gap:
    • trend-following gaps mid-trend carry higher chasing risk
    • better as a continuation signal for existing positions rather than a cue for new money to chase hard
  • Exhaustion gap:
    • often not suitable to chase; instead consider:
      • taking profits on longs
      • or waiting for reversal confirmation
A simple practical rule:
If you chase in and the gap is quickly filled, can you stop out without hesitation? If not, don’t “FOMO chase” at the most emotional moment.

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Summary

  • A price gap is a “vacuum zone” between trading days, representing a discontinuous shift in sentiment and capital force.
  • Three key trend-related gap types:
    • Breakaway gap: appears at trend start/range breakout, often on high volume, hard to fill in the short term—strong signal of a new trend.
    • Runaway (measuring) gap: often appears mid-trend, suggesting the trend may extend; sometimes used to roughly estimate targets.
    • Exhaustion gap: common near trend end, with extreme volume, often fills quickly—an important warning of possible reversal.
  • Key usage rules:
    • Start with trend context and location, then use volume and subsequent candles—don’t stare at the gap alone
    • Don’t blindly believe “all gaps must fill,” and don’t treat “gap fill” as the only strategy
    • Use gaps to:
      • refine stop-loss/take-profit placement
      • identify trend initiation, mid-trend acceleration, late-stage exhaustion
      • serve as a key puzzle piece for multi-tool confluence (with support/resistance, moving averages, patterns)
Remember: A gap itself is not a buy/sell reason—it only tells you a past “sentiment eruption” occurred here. What ultimately determines P&L is your overall control of trend, position sizing, and risk.

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Further Reading

  • Related resource links
    • Investopedia – Gap entry: systematically introduces definitions and features of different gap types (common, breakaway, runaway, exhaustion), helpful for concept organization.
    • StockCharts ChartSchool – Gaps and Gap Analysis: explains breakaway, runaway, and exhaustion gaps with plenty of illustrations, suitable for practicing against real candlestick charts.
  • Recommended books or articles
    • Technical Analysis of the Financial Markets — John J. Murphy (John J. Murphy) A classic technical analysis text with systematic discussion of gap types, patterns, and integrated analysis with trendlines and volume.
    • Articles on “Gap Types & Strategies” in various quant/practitioner blogs (e.g., Quantified Strategies), which often discuss win rates and strategy design via statistical backtests across markets—useful as a more quantitative follow-up.