MACD

Moving Average Convergence Divergence; trend-following momentum indicator.

The Moving Average Convergence Divergence (MACD) is a popular trend-following momentum indicator that shows the relationship between two moving averages of a security's price. It is calculated by subtracting the 26-period Exponential Moving Average (EMA) from the 12-period EMA. The result of that calculation is the MACD line. A nine-day EMA of the MACD, called the "signal line," is then plotted on top of the MACD line, which can function as a trigger for buy and sell signals. Investors and traders use the MACD to identify changes in the strength, direction, momentum, and duration of a trend in a stock's price. When the MACD line crosses above the signal line, it is often interpreted as a bullish signal, suggesting that the asset's price is experiencing upward momentum. Conversely, when the MACD falls below the signal line, it is seen as a bearish signal, indicating potential downward momentum. While the MACD is a powerful tool for identifying momentum, it is not without pitfalls. One common issue is "whipsaws," which occur when the lines cross back and forth rapidly, generating false trading signals. This typically happens during periods of consolidation or sideways price action when a clear trend is absent. Additionally, because the MACD is based on historical moving averages, it is a lagging indicator, meaning it reflects past price action rather than predicting future movements with certainty.

Suppose Stock XYZ has a 12-day Exponential Moving Average (EMA) of $150.00 and a 26-day EMA of $145.00. The MACD line is calculated as $150.00 - $145.00 = $5.00. If the 9-day EMA of this MACD line (the signal line) is currently at $4.00, the MACD line ($5.00) is above the signal line ($4.00), which traders generally interpret as a bullish momentum signal.