How to read a stock chart: price, volume, candlesticks and timeframes

Tickers and quotes

A ticker is a short symbol for a security: AAPL for Apple, VOO for a Vanguard S&P 500 fund. A quote shows the last traded price, the bid (the highest price a buyer is offering) and the ask (the lowest a seller will accept). The gap between them is the spread.

Line charts and candlesticks

A line chart connects closing prices and is the clearest way to see the overall trend. A candlestick shows four numbers for each period: open, high, low and close. The body spans open to close and the thin lines (wicks) show the extremes. By convention a green or hollow body means the close was above the open and a red or filled one means it closed lower.

Timeframes

The same stock looks different on a one-day, one-year and ten-year view. A drop that looks dramatic on an intraday chart may be a blip on a five-year one. Match the timeframe to your holding period.

Volume

Volume is how many shares traded. A move on unusually high volume involved many participants; the same move on thin volume may mean little. Thin trading also widens the spread and makes it harder to get a fair price.

Heat maps and price history

A heat map colours companies or sectors by performance and size, giving a fast picture of where the market is strong or weak. Price history lets you see how the stock behaved in past crashes and recoveries, which is a useful test of your own tolerance.

Charts show what happened. They are evidence about behaviour and risk, not a promise about what comes next.