Reading stock charts and understanding price movements
- Read a line chart and a candlestick
- Recognise trends, support and resistance
- Know the limits of chart reading
What a chart shows
A price chart plots price over time. A line chart usually connects daily closing prices. A candlestick shows four prices for each period: open, high, low and close.
Always check the time range and whether the axis is linear or logarithmic. A 1-year chart and a 10-year chart of the same stock can tell very different stories.
Trends
An uptrend is a series of higher highs and higher lows; a downtrend the opposite. A sideways or range-bound market moves between rough limits.
A moving average smooths the noise: a 50-day moving average is the average close of the last 50 days. Price above a rising moving average is a common sign of an uptrend.
Support, resistance and volume
Support is a price area where buying has tended to stop declines; resistance is where selling has tended to stop rallies. They reflect where many investors previously traded.
Volume, the number of shares traded, adds context: a big move on heavy volume suggests broader participation than the same move on light volume.
What charts cannot do
Charts describe the past. Patterns that look obvious afterwards are often unclear in real time, and studies of many chart patterns find weak or inconsistent predictive power once trading costs are included.
Use charts to understand how a stock has behaved and how volatile it is, not as a crystal ball.
The chart shows real SPY daily closes from VEXA’s data, with a 50-day moving average. Find a period where price stayed above the average and one where it fell below. Notice how many times price crossed the line without a lasting change in direction.
Those false signals are why single indicators are unreliable on their own.
Key terms
- Candlestick
- A chart bar showing a period’s open, high, low and close.
- Uptrend
- A pattern of higher highs and higher lows.
- Moving average
- The average price over a set number of past periods, updated each period.
- Support
- A price area where declines have tended to stop.
- Resistance
- A price area where rallies have tended to stall.
- Volume
- The number of shares traded in a period.
Open any stock in Stock Analysis, switch between 1M and 1Y, and describe the trend in each in one sentence.
Key takeaways
- Check the time range before reading a chart.
- Trends are higher highs and lows, or lower ones.
- Volume shows how much conviction a move had.
- Charts describe the past; treat patterns with scepticism.