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There's a 'monstrous bull market' developing under the surface of the SP 500. This hedge-fund manager tells you where it's at.

Reported by Opalesque
Oct 15, 2026· 2 min read
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Key Takeaways
  • • Great Hill Capital founder Thomas Hayes argues that a major rally could be developing among S&P 500 companies outside the dominant mega-cap technology names.
  • • Hayes contends that businesses using AI to improve productivity may offer better opportunities than some AI infrastructure suppliers facing increased competition.
  • • The primary source excerpt is truncated, so specific figures, price levels, and sector breakdowns cannot be confirmed from the available text.
Summary
Great Hill Capital founder Thomas Hayes argues that a broad rally could be forming within the S&P 500 beyond the mega-cap technology companies that have dominated index returns. According to the article, which Opalesque published under the headline "a bull developing under the surface," Hayes sees the more compelling opportunity in companies that are deploying artificial intelligence to raise productivity rather than in some of the infrastructure suppliers that face intensifying competition.

The distinction Hayes draws is between AI as a cost and efficiency tool for operating businesses and AI as a capital-intensive build-out theme. For allocators, that framing points to a potential rotation in which earnings gains are spread across a wider set of index constituents rather than concentrated in a handful of large-cap names.

The source excerpt available for this summary is incomplete, so it does not provide index performance data, valuation metrics, specific holdings, or the timeframe Hayes has in mind. Readers seeking those details should consult the full Opalesque article linked from the original story.

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Sources

1 outlet

AlphaMaven summarised this story from the reporting below. Each link opens the original article.

Opalesque There's a 'monstrous bull market' developing under the surface of the SP 500. This hedge-fund manager tells you where it's at.