By Jared Blikre

The S&P 500 (^GSPC) just pulled off a rare sprint.

The index just gained 10% in 11 trading days, a surge that has shown up only 23 times since 1962 in Yahoo Finance analysis. On the surface, that’s an encouraging signal.

S&P 500 gains after 10% rally in 11 days — since 1962 (23 occurrences)

The typical short-term follow-through has been modest, with median gains of 1% after one week and 2% after one month. Stretch the timeline out, though, and the picture improves: Median gains rise to 7% after three months, 12% after six months, 20% after one year, and 35% after two years.

That’s the bullish part. The nuance enters where this rally has landed.

Most prior cases did not arrive with the S&P 500 already back near a 52-week high. They came lower, during recovery phases when the market was still climbing out of a deeper hole.

This time, the index has already raced back toward the top of its range, which leaves only three close historical comparisons in the data: October 1982, March 2000, and November 2020.

S&P 500 returns after a 10% rally in 11 days near a 52-week high

Those three cases diverge materially. The 1982 and 2020 signals were followed by strong gains over the next year. The 2000 episode, by contrast, arrived near the dot-com peak and gave way to a major unwind. Investors buying that signal would lose over half of their money over the next two years and would not be made whole until 2007.

That leaves today’s setup in an unusual spot. History still leans bullish, especially over longer periods. But with the S&P 500 already near the highs, this is less a simple rebound statistic than a live test of whether momentum can turn into a sustainable breakout.

Jared Blikre is the global markets and data editor for Yahoo Finance. Follow him on X at @SPYJared or email him at jaredblikre@yahooinc.com.