What is a death cross?

A death cross is when a stock's 50-day moving average crosses below its 200-day moving average. It is one of the most widely watched signals that a long-term uptrend or range has flipped to a downtrend.

How it is calculated

A moving average is just the average closing price over a window of days, recalculated each day. The 50-day average reacts fairly quickly to recent price; the 200-day average moves slowly and stands in for the long-term trend. When the faster 50-day line falls down through the slower 200-day line, that crossover is the death cross. When it rises back above, that is a golden cross.

Why traders watch it

The death cross is popular because it is simple, objective, and marks a real change in trend structure: recent prices have dropped decisively below the long-term baseline. It is often used as a regime filter, for example avoiding new long setups in names that sit under a death cross, or tightening risk on positions once one prints.

Its limits

• It lags. Both averages are built from past prices, so the signal arrives after a good part of the decline has already happened. Crosses frequently print close to a short-term low.
• It whipsaws. In choppy, sideways markets the two averages can cross back and forth, producing false signals that reverse within weeks.
• It is not a guarantee. A death cross is context, not a prediction. Its value depends on the individual stock, the broader market, and what happened after that name's previous crosses.

How MomentumSift uses it

MomentumSift computes the 50/200 crossover nightly from end-of-day closes and confirms it on the close, so you are not chasing an intraday cross that reverses. Each stock also carries a track record of what happened after its past crosses, and the screener lets you sort fresh death crosses by relative strength and momentum to tell a whole-market rollover apart from one broken name. That turns a generic signal into base rates you can actually judge.

FAQ

What is a death cross in simple terms?

When a stock's 50-day average price crosses below its 200-day average price, signalling the long-term trend has turned down.

What is the opposite of a death cross?

A golden cross: the 50-day moving average crossing above the 200-day, signalling the trend has turned up.

Is a death cross always bad news?

Not always. It lags, so it often prints near a low, and it can whipsaw in sideways markets. It works best combined with other evidence rather than read as an automatic sell.