History Says the S&P 500’s 9-Week Rally Is Rare. It May Be Even Rarer Than You Think

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Rich Duprey

Sat, May 30, 2026 astatine 9:48 AM CDT 5 min read

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Micron (MU), Intel (INTC), and Advanced Micro Devices (AMD) person surged 201%, 178%, and 163% respectively since March 30, vastly outpacing the S&P 500’s 19.5% summation arsenic exertion stocks thrust the scale higher portion astir different sectors lag. The existent nine-week winning streak is uncommon but not unprecedented; however, today’s rally is dangerously concentrated successful a tiny radical of semiconductor and AI-related companies portion manufacturing enactment remains uneven and user assurance has plummeted.
The S&P 500’s attraction successful exertion (35% of the index) versus the much balanced assemblage creation of erstwhile winning streaks means the rally depends heavy connected a fewer AI and semiconductor winners, creating vulnerability if enactment falters.
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The banal marketplace keeps climbing, and investors person each crushed to consciousness optimistic. The S&P 500 closed this week with a humble 0.2% summation connected Friday, capable to widen its winning streak to 9 consecutive weeks. Since the marketplace bottomed connected March 30, the benchmark scale has surged 19.5%, adding astir $11 trillion successful marketplace worth successful conscionable 2 months.

That sounds similar the explanation of a steadfast bull market. But is it?

History suggests investors should observe the gains portion besides paying attraction to what's driving them. Because portion nine-week winning streaks are rare, the constitution of today's rally whitethorn beryllium precise antithetic from the rallies that came earlier it.

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Nine Weeks of Gains Is Rare, But Not Unprecedented

The existent tally is impressive, but it isn't without precedent. According to humanities marketplace data, the S&P 500 has recorded 10 erstwhile nine-week winning streaks since 1945. Longer streaks are adjacent rarer:

Winning Streak	End Date
13 weeks	June 1957
12 weeks	December 1985
10 weeks	May 1963
9 weeks	10 erstwhile occurrences since 1945

At archetypal glance, that seems encouraging. After all, if the marketplace has done this before, possibly investors shouldn't work excessively overmuch into it.

Granted, each rally has leaders. No bull marketplace advances with each banal moving successful lockstep. Yet today's marketplace operation differs dramatically from those earlier periods.

When the S&P 500 was launched, astir 85% of the scale consisted of concern companies, with utilities accounting for 12% and railroads making up the remaining 3%. By 1963, the marketplace remained mostly centered astir concern America.

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