What is a Golden Cross? Definition, Formula, and Example
A golden cross occurs when a stock's 50-day moving average crosses above its 200-day moving average — a long-term bullish momentum signal.
Golden Cross: Plain-English Definition
A golden cross is a technical chart event in which a shorter-term moving average crosses above a longer-term moving average. The canonical definition uses the 50-day simple moving average (SMA) crossing above the 200-day simple moving average. It is treated as a long-term bullish signal — confirmation that short-term momentum has pulled decisively above the long-term trend. The mirror-image event, where the 50-day crosses below the 200-day, is called a death cross and is treated as bearish.
How a Golden Cross Is Identified
Compute two simple moving averages on daily closing prices:
SMA50(t) = (P(t) + P(t-1) + ... + P(t-49)) / 50
SMA200(t) = (P(t) + P(t-1) + ... + P(t-199)) / 200A golden cross occurs on day t when:
SMA50(t-1) ≤ SMA200(t-1) AND SMA50(t) > SMA200(t)Some traders require both averages to be sloping upward at the crossover (both first differences positive) to filter out crosses during bear-market rallies. Exponential moving averages (EMAs) are occasionally substituted for SMAs, though the 50/200 SMA convention is far more commonly cited.
Worked Example
SPY printed a golden cross on February 2, 2023 after the 2022 bear market. Going into that session, the 50-day SMA sat at roughly $394 and the 200-day SMA at roughly $395 — by the close, the 50-day had pushed to $396 with the 200-day still at $394. Over the 12 months following that signal, SPY rallied approximately 21%, consistent with the bullish interpretation. Earlier signals — for instance the SPY golden cross of July 2020 after the COVID crash — preceded a ~30% rally over the subsequent year. Individual names like NVDA printed golden crosses in early 2023 before multi-hundred-percent runs.
When Traders Use the Golden Cross
Trend followers and long-term allocators use the 50/200 relationship as a regime filter — buying equities only when SMA50 > SMA200 and reducing exposure when the opposite is true. CTA-style systematic funds use related long-horizon moving average crossovers across asset classes. Swing traders rarely trade the cross itself because of how lagging it is; instead they use it to confirm positions built on faster signals like 20-day breakouts or MACD crossovers. Financial media treat golden crosses on major indices as headline events, often drawing additional retail flows on the signal.
Limitations and Common Misconceptions
The golden cross is a severely lagging indicator. Because it averages 50 and 200 days of past prices, the crossover typically occurs after 15-25% of the upside move has already happened. In whipsawing markets the signal produces false positives — the S&P 500 printed a golden cross in March 2015 and the index was lower a year later. Single-name stocks show weaker base rates than indices; the signal works best on broad baskets. Backtests also show that forward returns after a golden cross are only modestly better than unconditional forward returns on indices — much of the alleged edge comes from cherry-picked examples. And a golden cross tells you nothing about fundamentals, valuation, or macro conditions; pairing it with confirming volume, breadth, or macro regime checks improves reliability.