Fair Value Gap vs Liquidity Sweep
Michael Whitman
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Trading since 2017, full-time since 2020
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Published 2026-09-08
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Updated
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Reviewed
A fair value gap is the untouched strip between candle one's wick and candle three's wick in a fast three-candle run, and it can be marked as soon as candle three closes. A liquidity sweep is one session trading beyond a swing level and closing back inside it. One is an area, the other an event.
The common setup reads: price runs an obvious high or low, turns, and the turn leaves a fair value gap to enter on. Each part has a mechanical version, so the chain can be counted. On the Dow Jones fund DIA the chain was common after swept lows and no more common than chance after swept highs.
What each one is
Think of a fair value gap as a three-candle run whose outer wicks never meet. In a bearish run the first candle’s low stays above the third candle’s high, leaving the gap between. Fair value gap has the rule used here.
In a liquidity sweep, one session trades past an obvious level and closes back. Here the levels are five-bar swing highs and lows, live from five sessions after they form until a close beyond them. Liquidity sweep explains why the close back is the signal.
So the sweep happens at a level and the gap happens in a move. A sweep needs a level that existed before, whereas a gap needs nothing but three candles.
Where they differ
When each can be named. A sweep can be named once the session that pierced the level has closed. A gap needs candle three to finish, at least two sessions after candle one.
What each needs. The sweep needs a level drawn in advance and a definition of “back inside”. The gap needs only highs and lows.
How often each appears. DIA printed 2,422 gaps over nearly 29 years and 508 sweep days, about five gaps for every sweep.
What each implies. A sweep says a breakout attempt failed that day. A gap says price moved fast through a range. Neither says how far the next move will go.
Which one to use: Fair Value Gap or Liquidity Sweep?
Use the sweep as the event that makes you look, because it is tied to a level other people could see before it happened.
Use the gap as the area for an order only once it exists, and only after candle three has closed.
When a sweep comes with no gap, decide in advance whether you act. After swept highs on DIA that was the case about three times in four, so a plan that needs both will mostly sit out.
How often a sweep was followed by a gap
The test. For every sweep, look for a gap in the reversal direction whose candle one is the sweep day or one of the next two sessions: a bearish gap after a swept high, a bullish gap after a swept low. For a baseline, ask the same question of every session in the sample.
Swept lows: 124 of 250 (49.60%) were followed by a bullish gap. Across all 7,217 sessions with room for such a gap after them, 41.91% were. The sweep days differed from the other sessions by more than chance would usually give (Fisher exact test, p 0.013).
Swept highs: 67 of 257 (26.07%) were followed by a bearish gap, against 30.25% of all sessions, a difference well inside chance (p 0.15). On this market, a failed push above a high did not leave a downside gap any more often than an ordinary day did.
The late-July 2026 sweep
The sweep. DIA’s swing high of $527.93 was set on 16 July 2026. On 28 July the high reached $528.47, above it, and the close was $526.89, back below: a sweep of the high.
The gap. Candle one was the sweep day itself, low $523.67. Candle three, 30 July, had a high of $521.98. The band from $521.98 to $523.67 was a bearish gap.
What followed. On 31 July DIA traded back up through the band and closed at $524.32, above it, and on 3 August its high of $531.65 cleared the swept level. The sweep and the gap both happened; neither held for a week.
The original data
The sample. 7,221 DIA daily bars from Yahoo Finance, 20 January 1998 to 2 October 2026 (each session’s high, low and close). 257 sessions swept a live swing high and 251 swept a live swing low.
Inside the sweep day. The sweep day was the middle candle of an opposite gap only 8 times at highs and 19 at lows, so where a gap followed, it mostly began on the sweep day or the session after.
The file. Every sweep day, which kind of level it swept, its high, low and close, and whether an opposite gap began within three sessions are in the DIA sweep file.
What is left out. No trade is tested and nothing here measures how far price moved after either event. Other level definitions, such as prior-day or 20-session highs, give other counts.
When it fails
The failure is a plan that requires the gap after every sweep. The teaching draws the clean version: sweep, displacement, gap, return. On DIA’s swing highs the gap was missing about three times out of four, no rarer and no more common than on any session. A trader who waits for it on every swept high either sits out or starts to see gaps that are not there by the rule.
The second failure is calling a sweep before the close. Intraday, it is still a breakout.
A third is using levels drawn after the fact. Every reversal then has a level.
A fourth is reading the gap as a target. It is an area, not a forecast.
And a fifth is treating swept highs and swept lows as one case. On DIA they behaved differently.
Related
Fair value gap has the band rule. Liquidity sweep explains the event and its close-back signal. And liquidity covers the resting orders both ideas are said to target.
Do not wait for a sweep to hand you a gap before you plan the trade. On the Dow fund a gap after a swept high was no more common than on any other day. Write down what you will do if the sweep comes and no gap follows, because that was the usual outcome.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money.