What is a Death Cross? Definition, Formula, and Example
A death cross is a bearish technical pattern formed when a security's 50-day simple moving average crosses below its 200-day moving average, signaling potential long-term weakness.
Definition
A death cross is a bearish technical chart pattern that forms when a security's 50-day simple moving average crosses below its 200-day simple moving average. The signal is the mirror image of the golden cross and has a reputation — not fully earned by statistical evidence — as a harbinger of extended downtrends. Traders and financial media treat it as a trend-confirmation marker: by the time a death cross prints, the intermediate-term average has already been weaker than the long-term average long enough to pull the shorter line through from above.
How a Death Cross Is Identified
Signal fires when SMA(50) < SMA(200), given SMA(50) ≥ SMA(200) on the prior session.
Where:
SMA(N) = (P₁ + P₂ + ... + Pₙ) / N
With Pᵢ representing each of the last N daily closing prices.
Variants traders use:
- Classic death cross: 50-day SMA crossing 200-day SMA (the canonical definition)
- Exponential death cross: 50-day EMA crossing 200-day EMA (faster signal, more whipsaws)
- Weekly death cross: 10-week SMA crossing 40-week SMA on weekly charts — mathematically identical, different framing
- Sector death cross: applied to sector ETFs as a relative-strength downgrade
The cross itself is the entry signal; traders pair it with confirmation from volume, breadth, or momentum indicators like MACD or RSI to reduce false signals.
Worked Example
SPY printed a death cross on March 14, 2022, with the 50-day at $446.10 crossing below the 200-day at $446.12. The index had already corrected roughly 13% from its January peak by the time the signal fired — a common criticism of the indicator's lag. Over the following six months, SPY fell another 15% to a mid-October 2022 low near $348, validating the signal's direction even though the optimal short entry had passed months earlier.
Individual stocks produce more dramatic examples. META flashed a death cross on February 14, 2022, at $221 and fell to $88 by November — a 60% drawdown — before bottoming. NFLX crossed in December 2021 near $592 and bottomed at $162 in May 2022.
Counterexamples are equally common. SPY crossed bearishly in August 2023 and rallied 15% over the next four months; it crossed again in April 2022 only to produce one of the fastest golden-cross reversals in ETF history.
When Traders Use It
Trend-following systems use the 50/200 cross as a binary risk-on/risk-off filter. Funds that systematically flatten equity exposure on a death cross avoid the deepest drawdowns of cyclical bear markets at the cost of underperforming during choppy, trendless corrections.
Asset allocators treat the signal as a qualitative regime indicator rather than a precise entry. A death cross on SPY, combined with a flattening or inverted yield curve and deteriorating breadth, triggers formal review of risk targets.
Retail traders most often use it as confirmation of a bearish bias already formed from other sources, or as a cue to tighten stop-losses on existing long positions.
Limitations and Common Misconceptions
The death cross is severely lagging. The 200-day SMA reflects roughly nine months of price data, and the 50-day needs weeks of weakness to pull through it. Backtests of the S&P 500 since 1950 show that death-cross signals arrive 15-20% below the prior peak on average — well after the drawdown is established.
Historical win rates are roughly 50/50. Death-cross signals during bull-market corrections (1998, 2011, 2015-16, 2023) produced false alarms and rapid reversals. The signal works in cyclical bear markets (2000-02, 2008, 2022) and fails in short-cycle pullbacks.
The pattern says nothing about magnitude or duration. A death cross before a 10% additional decline and one before a 50% decline look identical at the moment of signal.