Moving average
Average price over a rolling period.
A moving average is the average price of a stock calculated over a fixed number of past sessions. As each new session arrives, the oldest price drops out of the calculation and the new one enters. The result is a line that 'flows' through time, smoothing daily oscillations and making the underlying trend more visible.
The two most widely used moving averages are the MA50 (50 sessions, roughly 2.5 months of trading) and the MA200 (200 sessions, roughly 10 months). The MA50 responds more quickly to recent moves; the MA200 is slower and captures the long-term trend. A stock trading above its MA200 is generally considered to be in an uptrend; below the MA200, in a downtrend.
Worked example
A 'golden cross' occurs when the MA50 crosses above the MA200 from below. It is one of the most closely watched technical signals: it implies that the short-to-medium term trend has overtaken the long-term trend, historically associated with positive market phases. The 'death cross' is the opposite — MA50 crossing below MA200 — historically associated with extended weakness.
Apple formed a golden cross in January 2023 after the 2022 drawdown. Investors using this as a confirmation signal were positioned when AAPL subsequently recovered 60% over the following 12 months. Apple's death cross in August 2022 had signaled the downtrend that materialized in the weeks following the crossover.
When it's used
Moving averages have three practical uses. First, identifying the dominant trend: price above MA200 = long-term uptrend; below = downtrend. Second, identifying dynamic support and resistance: the MA50 and MA200 often act as support during pullbacks in uptrending stocks. Third, generating entry and exit signals: the golden/death cross is one of the simplest and most widely followed signals in technical analysis.
Limits
Moving averages are lagging indicators: they follow price, they do not anticipate it. A golden cross signal always arrives after the trend has already formed — in highly volatile markets, by the time the signal fires, much of the move has already occurred. In sideways markets (trading ranges) moving averages generate many false signals (whipsaws). Their effectiveness is greatest in clear trends and lowest during consolidation phases.
Frequently asked
Simple or exponential moving average?
The simple moving average (SMA) weights every day in the window equally. The exponential moving average (EMA) gives increasing weight to more recent days — it responds faster to recent moves but generates more false signals. SMA 50 and SMA 200 are the standard reference cited by analysts and financial media; EMA is preferred by short-term traders.
Why is the MA200 so widely followed?
Because 200 sessions cover roughly 10 months of trading — nearly a fiscal year. It is long enough to filter noise and short enough to remain operationally relevant. In 30+ years of S&P 500 data, staying invested only when price is above the MA200 has reduced maximum drawdown by roughly 30–40% compared to buy-and-hold, at the cost of a few points of annualized return.
Do moving averages work for all stocks?
Best on liquid stocks with clear trends. On illiquid small-caps or highly volatile names, moving averages are distorted by volatility spikes and produce unreliable signals. On indices and liquid large ETFs they are generally more robust.
Related terms
Educational definition. Not financial advice.