Candlestick Charts: What Each Bar Actually Contains

A candlestick is a compact way of drawing four numbers: the opening price, the closing price, the high and the low, for one period. The period can be a minute or a month. The shape is the same either way.

The thick part, called the body, spans open to close. The thin lines above and below, called wicks or shadows, reach to the high and the low. Colour convention indicates direction: filled or red when the close was below the open, hollow or green when it was above.

Why the format survived

The technique came out of Japanese rice markets in the eighteenth century and reached Western trading floors in the 1990s. It persisted because it makes one thing immediately visible that a plain line chart hides entirely: where price travelled inside the period, not just where it finished.

A line chart plots closes. Two days that both closed at the same level look identical on it. On a candlestick chart, a day that opened low, ran high, and settled back is a completely different shape from a day that drifted quietly to the same close. The information is in the wicks.

What the anatomy communicates

• A long body means the open and close were far apart, so one side controlled the period from start to finish.
• A short body means price finished near where it started, whatever happened in between. Indecision, in the usual shorthand.
• A long upper wick means price reached considerably higher and did not hold there. Selling met the advance.
• A long lower wick means the reverse. Price fell and was bought back up before the close.
• Almost no wicks means the period traded within its open to close range, a directional move without much argument.

None of this is a forecast. It is a description of what happened, drawn compactly.

The named patterns, and an honest assessment of them

Dozens of formations have names. A doji is a candle with almost no body, open and close nearly equal. A hammer has a small body at the top and a long lower wick. An engulfing pattern is a candle whose body fully covers the previous one.

The names describe real shapes and the shapes describe real trading. The difficulty is what gets attached to them. Pattern guides frequently assign directional meaning to a single candle, and a single candle is a very small sample of market behaviour. Academic testing of individual candlestick patterns has generally found weak and inconsistent predictive value once transaction costs and multiple testing are accounted for.

What survives that scrutiny better is context. A hammer at a level where price has repeatedly stopped falling, on heavy volume, is a different observation from the same shape appearing in the middle of a quiet range. The shape is not the information. The shape plus where it occurred plus how much trading it took is closer to it. That is the same argument made about volume and about support and resistance.

Timeframe changes everything

The same price history produces entirely different candles depending on the period chosen. A dramatic reversal pattern on a five minute chart may be a single unremarkable wick on the daily. A daily chart showing a clean uptrend can be one candle inside a weekly chart that shows nothing of the kind.

This is worth stating plainly because it is the most common source of confusion when two people look at the same stock and describe opposite pictures. They are frequently both reading correctly, at different resolutions.

What candles leave out

A candlestick contains four prices and nothing else. It does not contain volume, which has to be read from a separate panel. It does not contain what happened outside the session, so for stocks that gap on overnight news the shape can be misleading about how orderly the move was. And it contains no information about why price moved, which is the part that determines whether a move persists.

That is the general case for reading price alongside other dimensions rather than alone, which is set out in technical vs fundamental analysis.

What a chart leaves for the others to answer

Price structure is one of four dimensions EquityBias reads per covered stock, alongside fundamentals, analyst activity and news sentiment. A stock whose chart looks constructive while its fundamentals deteriorate produces a wide gap between those readings, and that gap is reported as divergence rather than smoothed into an average. Every covered stock carries a 30 day score history on its own page, browsable from the coverage directory.

EquityBias is a market data research tool. Nothing here is financial advice. Chart patterns describe past price movement and do not indicate future performance.