What Is an Order Block? Definition, How to Mark One, and 27 Years of QQQ Data
Michael Whitman
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Trading since 2017, full-time since 2020
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YouTube creator, 137K subscribers
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Published 2026-09-05
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Updated
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Reviewed
An order block is the last opposing candle before a move that breaks market structure. It marks the price area where large orders entered and pushed hard enough to change direction. Either the move after that candle broke structure, or the zone is not an order block at all.
Covered on this page: TradingView and LuxAlgo.
An order block is the last opposing candle before a move that breaks market structure: the last down candle before a rally that takes out a swing high, or the last up candle before a drop that takes out a swing low. On QQQ’s daily chart since 1999, price came back to 298 of 348 such blocks, and 59.73% of those first returns closed straight through the body.
Two words in that definition do a lot of work, so here they are in plain English.
Market structure is the sequence of highs and lows a chart makes. In an uptrend each high sits above the last one. In a downtrend each low sits below the last.
Breaking structure means price does something that pattern says it should not: a downtrend takes out a previous high, or an uptrend takes out a previous low. The break of structure and change of character pages cover the two kinds of break in detail.
How it forms
A large participant cannot fill a big position in one click without moving price against themselves, so the idea is that they build it inside a range, then push. On the chart the quiet part looks like small candles going the wrong way, then one decisive move in the other direction. The last candle going the wrong way, immediately before that move, is the order block.
Three conditions have to hold:
- It is the last opposing candle. Last down candle before an up move; last up candle before a down move. Not the biggest candle, the last one.
- The move that follows breaks structure. It has to close beyond a prior swing high or low.
- The move leaves an imbalance. Price travels fast enough that candles barely overlap.
Miss any of the three and you are drawing boxes on noise.
When price did come back to an SPY demand zone, it closed through it within 10 sessions 57.69% of the time, a figure from trading supply and demand zones.
A candle’s color only compares close with open, so it can mislead: about one SPY daily bar in six since 1993 was colored against the day’s net change (candlesticks).
Bullish and bearish order blocks
A bullish order block is the last down candle before a move that breaks structure upward. A bearish order block is the last up candle before a move that breaks structure downward. Same logic, mirrored. Most explanations show only the bullish case, and on QQQ the two did not behave alike: bearish blocks held on their first return less often (30.16%) than bullish ones (47.67%). QQQ mostly rose over the sample, which may be part of the reason.
Which part of the candle is the zone
The zone is the candle’s body, open to close. The wick is not part of it. The common convention puts the stop beyond the wick and treats a close through the body as the end of the block, which is the rule the data on this page uses.
How to mark one
Step one: find the break of structure first. Not the candle, the break. If nothing broke, there is no order block to find.
Step two: walk backwards to the last opposing candle. Now mark its body.
Doing it the other way round, spotting a nice candle and hoping a break follows, is how a chart ends up with fifteen boxes and no way to tell which one matters.
Why price comes back at all
When price moves fast, candles stop overlapping, and the claim is that orders which wanted to fill in that range never got the chance. That unfilled area is an imbalance, or fair value gap, and the fast move itself is what ICT traders call displacement.
On QQQ the imbalance made no difference to whether price came back. Price returned to 156 of 184 blocks with an imbalance (84.78%) and 142 of 164 without one (86.59%). Returning is common for any price: XLF traded 84.89% of its ordinary daily lows again within 20 sessions, slightly more than the 83.20% of bullish imbalances it re-entered.
A worked example
QQQ, September and October 2026, daily bars. On 8 September QQQ made a five-bar swing high at $721.89. On 21 September it closed at $741.47, above that high: a break of structure, with gaps between candles on the way up.
The last down candle before the break was 16 September: open $708.00, close $704.72. The block is the body, $704.72 to $708.00.
First return, 16 October. QQQ traded down to $707.23, inside the body, and closed at $709.80. The next session’s low was $716.57, clear above the body, so that return held.
Second return, 22 October. QQQ traded down to $701.90 and closed at $704.47, 25 cents below the bottom of the body. The block was finished, five weeks after it formed.
The original data
Sample: QQQ daily bars from Yahoo Finance, 10 Mar 1999 to 27 Oct 2026, 6,952 sessions. A bullish break is a close above the latest confirmed five-bar swing high (a high strictly above the five on each side, usable five sessions later); the block is the last down candle before that close, searched back to the swing high, and the zone is its body. Bearish blocks are the mirror. Before a return can count, price has to leave the body with a whole session beyond it. A return held if price left the body again before any close beyond its far side, and failed at the first close through it. A failed return ends the block. Returns are followed for 500 sessions, about two years, after the break (after the candle itself for the baseline below).
How many and how soon. The rule found 348 blocks, 208 bullish and 140 bearish, with a median body of 0.48% of price. Price came back to 298 of them (85.63%), 206 within 20 sessions, after a median of 10 sessions.
The finding: on its first return an order block failed more often than it held, and it held about as often as any candle body. Of the 298 first returns, 120 held (40.27%) and 178 failed (59.73%). Bullish blocks held on 82 of 172 (47.67%). As a baseline, every down candle in the sample was given the same test with no break of structure required: the first return to its body held on 469 of 1,011 (46.39%). Bearish blocks held on 38 of 126 (30.16%), against 293 of 852 (34.39%) for every up candle. On this fund, the structure condition added nothing measurable to how the zone behaved.
The touch count did not decide it either. Second returns held on 46 of 111 (41.44%), third returns on 19 of 41 (46.34%). Those later samples are small, but none of them shows a block wearing out with use.
The check. Nasdaq’s own QQQ history, 27 Oct 2016 to 27 Oct 2026, run through the same code, finds the same 132 breaks of structure as Yahoo’s bars over those ten years, with the same block candle on 129 of them. First returns held on 47 of 116 with Yahoo and 49 of 115 with Nasdaq (40.52% and 42.61%); Nasdaq rounds prices to the cent, which moves a few closes across a body edge. The check covers the price data and the code, not a second market. Every block is in the QQQ order block file.
What it cannot show. One fund, one timeframe, one mechanical rule. Traders who mark blocks by eye, add volume or trade intraday are testing something else.
Across our study of 24,971 trading videos, 393 have order block in the title, at a median of 2,669 views, and 75% never pass 50,000. Only 10 of the 393 titles also name market structure, a break of structure or a change of character, so the condition that defines a block is rarely in the headline.
Order block, breaker block and mitigation block
An order block that fails can become a breaker. When a full body closes through the zone, the block is dead as a block. If price later comes back from the other side and reacts, the same candle gets a new name, the breaker block, and order block vs breaker block sets the two side by side.
A mitigation block is named for the return, not the origin. The mitigation block page explains why it can only be drawn after the reaction.
A supply or demand zone is the wider cousin. It marks the whole quiet area a move left from rather than one candle, so the same move gives a thin order block inside a broader supply and demand zone.
And the block is one piece of a larger vocabulary. It sits inside smart money concepts and the ICT method, which add timing and liquidity rules around it.
When it fails
A failed order block looks identical to a good one at the moment of entry. The differences show up afterward.
Price closes through on the first return
This was the most common outcome on QQQ: 178 of 298 first returns. When a full body closes on the far side, the block is over, and if it was traded, the close through it is where the trade was wrong.
The move never broke structure
You marked a big candle followed by a strong push, but the push stopped short of the prior swing. No break, no order block: you have drawn a level inside ordinary market structure and given it a bigger name.
You expected the first touch to be the strong one
On QQQ the first return held 40.27% of the time and the second 41.44%. Counting touches is cheap, but on this data it did not separate good returns from bad ones.
You marked it after the move happened
Scrolling back to find the candle that worked is easy, and it feels like analysis. The test: would you have marked the same zone using only the candles to the left of the break?
Questions people ask
What is an order block in trading?
The last opposing candle before a move that breaks structure, marked by its body. On QQQ’s daily chart the body was a median 0.48% of price wide.
Do order blocks work?
On QQQ since 1999, price came back to 85.63% of them, and 59.73% of those first returns closed through the body. Bullish blocks held on 47.67% of first returns, close to the 46.39% for the body of any down candle.
Does an order block need an imbalance?
Most definitions require one. On QQQ, price came back to 84.78% of blocks with an imbalance and 86.59% of blocks without one.
Is the first touch of an order block the best one?
Not on this data: 40.27% of first returns held, 41.44% of second returns and 46.34% of third returns.
Related
Order blocks only make sense once you can read market structure, because the break of structure is what qualifies the block in the first place.
The imbalance the move leaves behind is a fair value gap, and the two often mark the same area from different angles.
The reason given for price returning at all is liquidity: resting orders that were never filled.
When you are ready to mark one on a live chart, how to identify an order block takes it from entry to invalidation.
I keep both the internal and the swing blocks turned on. The internals are shorter-term support and resistance, and the swings are the ones I build a trade around, but I want to see both, because an internal block sitting inside a swing block is a very different thing from one floating on its own.
— Michael Whitman
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