200-Day Moving Average

An indicator used to analyze long-term market trends by averaging a security's closing prices over the past 200 days.

The 200-day moving average (200-DMA) is a widely followed technical indicator used to assess long-term market trends. It is calculated by taking the average of a security's closing prices over the preceding 200 trading days, which represents roughly 40 weeks or 10 months of market activity. By smoothing out daily price volatility and short-term noise, it provides a clearer picture of the asset's underlying trajectory. Investors and market analysts closely monitor the relationship between a security's current price and its 200-day moving average. When the price trades consistently above the 200-DMA, the asset is generally considered to be in a long-term uptrend. Conversely, when the price trades below the 200-DMA, it is viewed as being in a long-term downtrend. The line itself often serves as a psychological support level during market pullbacks or a resistance level during relief rallies. While the indicator is highly valued for its simplicity and historical significance, it is a lagging indicator. Because it relies on past price data, it will not predict trend changes ahead of time, but rather confirm them after they have begun. A common pitfall for retail investors is relying on it too heavily in sideways or range-bound markets, where the price may repeatedly cross back and forth over the average, generating false signals.

Suppose a stock's closing prices over the last 200 trading days sum to $10,000. The 200-day moving average is calculated as $10,000 / 200 = $50. If the stock's current price is $55, it is trading above its 200-DMA, signaling a long-term uptrend. If the price falls to $45, it has broken below the 200-DMA, signaling a potential shift to a long-term downtrend.