MACD — What It Is and How to Read the Chart
MACD (Moving Average Convergence Divergence) is a momentum indicator that compares two exponential moving averages (12 and 26 days) to identify shifts in direction earlier than regular averages.
The MACD line is calculated as the difference between the 12-day EMA and the 26-day EMA. Alongside it sits a 'signal line' — a 9-day moving average of the MACD line itself. The histogram shown on the chart is simply the gap between these two lines.
When the MACD line crosses above the signal line, it's called a potential buy signal — suggesting short-term momentum is strengthening relative to the trend. A crossing below is called a potential sell signal. A growing histogram in the positive direction suggests strengthening momentum, not just direction.
MACD is inherently a lagging indicator (built from averages of past prices), but because it gives more weight to recent prices (being EMA-based), it reacts faster than crossovers of plain moving averages like SMA 50/200.
How StockIQ AI uses this
MACD is one of about 23 indicators checked in parallel in StockIQ's technical category (25% of the score) — never evaluated alone, but alongside RSI and moving averages to reduce false signals.
Frequently asked questions
What does a MACD crossover mean?
When the MACD line crosses above its signal line, it's considered a potential buy signal suggesting strengthening short-term momentum; a crossing below is considered a potential sell signal. Like any technical indicator, it works best combined with other tools, not as a single absolute signal.
Is MACD a leading or lagging indicator?
MACD is technically a lagging indicator, since it's built on averages of past prices — but because it uses exponential moving averages (which weight recent prices more heavily), it reacts faster than crossovers of simple moving averages.
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The information on this page is intended for general educational purposes only and does not constitute investment advice. Full details on the disclaimer page.