90% of the Biggest SPX Rallies Happened in Bear Markets

The most exciting days in stock market history all happened when things were terrible. Here’s the proof — and why “boring” is the real bull signal.

A Counterintuitive List

If someone asked you to guess when the biggest single-day gains in S&P 500 history occurred, you might guess during euphoric bull markets. Maybe the dot-com boom. Maybe the post-COVID recovery.

You’d be wrong.

We pulled the 50 biggest single-day percentage gains in SPX history (going back to 1950), and the results are almost comically one-sided:

• 90% occurred when SPX was below its 200-day moving average
• 72% occurred during a bear market (>20% drawdown from all-time high)
• The average drawdown from ATH at the time of these “huge rallies” was -28.2%

The Top 20: A Hall of Pain

All 20 occurred below the 200-day moving average. Every single one.

Why Does This Happen?

The mechanical reason: In volatile markets, daily price ranges expand dramatically. A stock that normally moves 0.5% per day might start moving 3-5% per day. This expands both the upside and downside extremes. The biggest up days and the biggest down days are siblings, not opposites.

The psychological reason: Massive rallies happen when fear reaches a breaking point. Short sellers cover. Bargain hunters pile in. Central banks announce emergency measures. The relief is explosive — but temporary. Because the fundamental problems that caused the crash haven’t been solved in 6.5 hours of trading.

October 13, 2008 — the biggest single-day gain ever — happened during the Global Financial Crisis. SPX rallied 11.58%. The market was down -35.9% from its all-time high. And it would go on to fall another 20% before bottoming in March 2009.

That +11.58% day? It was a pit stop on the way to hell, not a U-turn.

Where They Cluster

• 1950-1970: 3 events (20 years of boring, steady gains)
• 1970-1987: 7 events (inflation crisis era)
• 1987 Crash: 2 of the top 50 in just 2 trading days
• 1988-2000: 4 events (12 years of bull market = few extreme days)
• Dot-com bust: 5 events
• GFC (2008-2009): 12 events
• 2010-2020: 12 events (mostly COVID)
• 2021+: 2 events

The pattern is unmistakable: boring decades produce few extreme up days. Chaotic periods produce dozens.

The Boring Edge Takeaway

This is the thesis of our entire publication, crystallized in one chart:

The most exciting days in market history are the most dangerous.

If you see a +5% day and feel the urge to buy, pause. Look at where the market is relative to its 200-day moving average. Look at the drawdown from ATH. Chances are, you’re not buying a recovery — you’re buying a bounce inside a crash.

The real bull signals? They’re boring:

• Slow, steady advances above a rising 200-SMA
• Average daily moves of 0.3-0.5%
• Low VIX (below 15)
• No headline-worthy single days

When nothing exciting is happening, that’s when the compounding is happening. When everybody’s screaming “biggest gain in 90 days!” — that’s when the compounding has been interrupted.

Boring is the edge. Excitement is the tax.

Data: S&P 500, January 1950 – March 2026. Bear market defined as >20% drawdown from prior all-time high. 200-SMA calculated on daily closing prices.