• Yardeni Research suggests the traditional year-end Santa Claus rally may be limited as investors rotate away from the Magnificent Seven toward broader market sectors.
  • The firm declared its 7,000 year-end S&P 500 target effectively met when the index hit 6,901 on December 11, potentially marking the year's high.
  • Ed Yardeni expects this rotation to continue through 2026, citing concerns about AI investment pressures on megacap cash flows and more attractive valuations elsewhere.

A Shifting Market Landscape

Yardeni Research is sounding a cautious note on the traditional year-end market surge, warning that a rotation away from the Magnificent Seven megacap tech stocks could dampen the Santa Claus rally that typically lifts the S&P 500 in December. According to people familiar with the firm's latest analysis, this shift reflects growing investor skepticism about whether massive AI investments will deliver adequate returns for the tech giants that have dominated market leadership.

"We're seeing what looks like a bubble losing air rather than bursting," Ed Yardeni, founder of the independent research firm, told clients in recent communications reviewed by this publication. He pointed to multiple compression in the Magnificent Seven as evidence that the market is reassessing growth expectations for these AI-focused companies.

The Rotation Gains Momentum

Recent market data shows small caps and broader S&P constituents outperforming the megacap leaders, with the Russell 2000 gaining ground while some Magnificent Seven stocks have faced selling pressure. Yardeni has recommended underweighting the Magnificent Seven and reallocating toward other tech areas plus financials, industrials and small caps—what he calls the "impressive 493" (the rest of the S&P 500).

One portfolio manager at a major institutional fund, speaking on condition of anonymity, confirmed that rebalancing away from concentrated megacap positions has accelerated in recent weeks. "The valuation dispersion has become too extreme," they said. "We're finding better opportunities in sectors that benefit from AI-driven productivity without carrying the same upfront capex burden."

AI Investment Pressures Mount

At the heart of Yardeni's analysis is concern about the financial strain of AI infrastructure spending. The Magnificent Seven are committing enormous capital expenditures to AI projects, which the research firm says is pressuring cash flows and near-term earnings. This creates uncertainty about when—or whether—these investments will generate adequate returns for shareholders.

Yardeni explicitly compared current conditions to the late-1990s tech bubble during a recent client call, though he emphasized key differences. "Back then, few acknowledged a bubble at the time," he noted. "Today, there's constant debate about whether AI-led valuations are sustainable." He referenced an earlier "DeepSeek episode" correction in AI-linked names as a template for what might happen as growth expectations are reassessed.

What Comes Next

With the S&P 500 having already reached what Yardeni considers the effective equivalent of his 7,000 year-end target, the research firm suggests limited upside remains into year-end. The rotation theme is expected to persist well beyond December, with Yardeni anticipating it will continue through 2026 as AI competition intensifies and questions about returns on AI capex persist.

Market participants are watching closely whether this rotation represents a temporary rebalancing or a more fundamental shift in market leadership. For now, the broadening of gains beyond seven stocks suggests the bull market may be entering a new phase—one where financials, industrials, healthcare and small caps could take the lead while megacap tech faces headwinds.

Correction: An earlier version of this article misstated the date when the S&P 500 reached 6,901. It was December 11, not December 10.