Anatomy of a Candlestick
Break down the four components of every candlestick -- open, high, low, and close -- and learn what each reveals about market behavior.
Anatomy of a Candlestick
Every candlestick on your chart is built from four raw data points: the open, the high, the low, and the close -- collectively known as OHLC data. These four numbers are rendered into a visual shape that tells you far more than any single price point ever could. Understanding each component is essential before you can begin recognizing patterns or making trading decisions.
The Four Data Points
Open: The first traded price when the period begins. On a daily chart, this is typically the first trade of the day. The open sets the starting point against which the rest of the period's action is measured.
High: The highest price reached at any point during the period. This represents the maximum extent of buying pressure -- the peak that bulls managed to push price to before sellers stepped in.
Low: The lowest price reached during the period. This represents the maximum extent of selling pressure -- the floor where sellers finally exhausted themselves or where buyers saw enough value to step in.
Close: The last traded price when the period ends. The close is widely considered the most important of the four data points because it represents the final consensus of value for that period. It is where traders were willing to hold positions into the next period, which carries meaningful psychological weight.
The Body
The body is the thick, rectangular portion of the candlestick. It spans the distance between the open and the close.
The size of the body is critically important. A long body indicates strong momentum and conviction. A short body indicates indecision or equilibrium. A doji is an extreme case where the open and close are virtually identical, creating the ultimate expression of indecision.
The Shadows (Wicks)
The thin lines extending above and below the body are called shadows, wicks, or tails. They reveal the full range of price action that occurred outside the body.
Upper shadow: Extends from the top of the body to the high. Long upper shadows signal selling pressure or rejection at higher prices.
Lower shadow: Extends from the bottom of the body to the low. Long lower shadows signal buying pressure or rejection at lower prices.
No shadow: Candles with no shadows at all are called marubozu and represent total dominance by one side.
Putting It All Together
Scenario 1: Long green body, tiny shadows. Buyers dominated the entire period. Strong bullish sentiment with high conviction.
Scenario 2: Small red body, very long lower shadow. Classic hammer shape. Despite closing slightly below the open, the long lower shadow tells you demand is present at lower prices.
Scenario 3: Tiny body, long shadows in both directions. Spinning top or doji variant. Total indecision -- neither buyers nor sellers could establish control.
Scenario 4: Long red body, no lower shadow, small upper shadow. Sellers controlled the period almost entirely. Very bearish.
Why the Close Matters Most
The closing price represents the market's final opinion for that period. It determines profit and loss for traders who hold positions, and it is the level from which the next period's action begins. Many pattern confirmation rules specifically rely on where the candle closes relative to key levels.
Practice Exercise
Pull up any chart and examine individual candles. For each candle, identify: Where did it open? Where did it close? How far did the shadows extend? Which side controlled the period? Was there price rejection in the shadows? This exercise, repeated daily, trains your eyes to read candles instinctively.
> Key Takeaway: The body tells you who won the battle; the shadows tell you how hard the losing side fought. Together, they reveal the complete psychology of each trading period.