Odds That Stock Market Bubble Will Burst Dwindling As S&P 500 Shows Signs of Broadening, Says Yardeni Research

The president of sell-side Wall Road agency Yardeni Analysis says he’s seeing indicators of a broadening bull market as momentum shifts to small and mid-cap (SMID) shares.

Ed Yardeni says the ratio of the S&P 100 to the S&P 500 might have peaked on the finish of final 12 months.

“If that’s the case, then the percentages of a bubble bursting now are a lot decrease than they have been again then, when the inventory market was rather more concentrated in tech names than it’s now, in line with this ratio.

So as a substitute of a bursting bubble, we could also be seeing a broadening bull market.”

Final month, Yardeni shifted to underweight on the Magnificent 7 shares, arguing that the tech giants are actually competing with each other in a “Recreation of Thrones” surroundings. The shift represented the agency’s first transfer away from being obese on the sector in 15 years.

Yardeni says in his new evaluation that the brand new thesis is working to date.

“Till late final 12 months, the Magnificent-7 operated as seven impartial kingdoms protected by giant moats. Every prospered with its personal distinctive monopoly. Nevertheless, the AI arms race has upended that peaceable coexistence by significantly growing competitors amongst them. The ratio of the S&P 500 MAGS to XMAG ETFs peaked after Michael Burry famously tweeted on October 31, 2025, ‘Generally, we see bubbles. Generally, there’s something to do about it.”

The Wall Road veteran notes that SMID shares have outperformed giant caps, although he acknowledges that this improvement could possibly be a head pretend.

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