Market structure: higher highs, lower lows and break of structure

Market structure is the shape the market leaves behind as it swings: the sequence of its highs and lows. Instead of asking an indicator whether there is a trend, you read it straight from price. An uptrend is a series of higher highs and higher lows; a downtrend is a series of lower highs and lower lows; everything else is some kind of range.

Swing points: the raw material

A swing high is a peak with lower prices on both sides; a swing low is a trough with higher prices on both sides. A common practical definition: a candle whose high is above the highs of the two candles before and the two after it is a swing high (mirror it for swing lows).

Not every small bump counts. If you mark every two-candle wiggle on S5, you will find "structure" changing every few seconds. Choose a timeframe first, then mark only swings that stand out clearly on that timeframe.

The three basic states

Uptrend

Each rally ends higher than the previous one (higher high, HH) and each pullback stops above the previous pullback (higher low, HL). The higher lows are the important part: they show buyers stepping in earlier each time.

Downtrend

Each drop goes deeper than the previous one (lower low, LL) and each bounce fails below the previous bounce (lower high, LH). The lower highs show sellers becoming more eager.

Range

Highs and lows stay roughly level: price swings between a ceiling and a floor without making progress. A range is not a failure of analysis — it is a structure too, and markets spend a lot of time in them. Ranges can also be untidy: a higher high followed by a lower low (an expanding range) or lower highs with higher lows (a contracting one, which leads into the triangle pattern).

Break of structure

A break of structure (often shortened to BOS) is the moment the sequence is violated:

• In an uptrend, price closes below the most recent higher low. The rule "every pullback stops higher" has just failed.
• In a downtrend, price closes above the most recent lower high.

A first break is a warning, not proof of reversal. A full reversal from up to down is usually confirmed when, after breaking the last higher low, price bounces, fails to make a new high (that is a lower high), and then falls to a new low. Some traders call the first break a "change of character" and the confirmed sequence a new trend; the vocabulary varies, the logic is the same.

A worked example

On AUD/USD, M5, you mark these swings in order:

1. Low at 0.6550
2. High at 0.6572
3. Low at 0.6561 (higher low)
4. High at 0.6588 (higher high)
5. Low at 0.6576 (higher low)
6. High at 0.6584 — lower than 0.6588

So far price has made HH and HL, then a slightly lower high at step 6. That alone is a hint of fatigue, nothing more. Then a red candle closes at 0.6571 — below the last higher low at 0.6576. Structure is broken. If the next bounce stalls around 0.6580 and price then falls below 0.6571, you have a lower high and a lower low: the uptrend on M5 has turned into at least a short-term downtrend.

Note what did not happen: no indicator crossed, no pattern was named. You read it from six numbers.

Structure across timeframes

Structure is fractal: an M1 downtrend can be a single pullback inside an M15 uptrend. This is why it pays to know which timeframe's structure you are trading. A practical approach is to take direction from a higher timeframe and use breaks of structure on a lower one for timing — for example, waiting for M1 to break its little downtrend back to the upside while M15 is still making higher lows. See timeframes explained for how to pick the pair of timeframes.

Market structure on short expiries

For expiries under a few minutes, the structure that matters is on roughly S30 to M5. Two points to keep in mind:

• Breaks are noisy on tiny timeframes. On S5, swings form and break constantly. A break that looks dramatic on S5 may be a normal pullback on M1.
• The first move after a break is often a retest. Price frequently returns to the broken swing level before continuing. A short trade opened right at the break can lose to that retest even if the new direction is correct.

False signals and typical mistakes

• Marking too many swings. If every candle is a swing, there is no structure.
• Calling a reversal on the first break. Many breaks are just deeper pullbacks; the trend resumes and the "reversal" traders are caught.
• Wick-only breaks. A wick that pokes below the higher low and closes back above it is not a close beyond the level. Decide whether you count wicks or closes — closes are generally the stricter choice.
• Ignoring ranges. Trying to see a trend in a sideways market leads to buying the top and selling the bottom of the range.
• Applying it to OTC as if it were a real market. OTC prices on Sky Trade are generated by Sky Trade's server and do not track any real market; the next tick is unpredictable, so structure there only describes the past.

To quantify whether a trend is strong or weak rather than just its direction, many traders add the ADX; trend lines give the same structure a visible slope.

How to add it in the Sky Trade terminal

Mark the latest swing high and swing low with the horizontal level tool, and move them as new swings form; a close beyond the relevant line is your break of structure. The Line chart type is handy for spotting swings quickly.