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NVDA and Four Megacaps Drive Over 40% of S&P 500 YTD Returns, Breadth Deteriorating

The Russell 2000 and mid-caps lag as passive flows concentrate in AI-linked names, even as BAC beat with NII up 9% and ROTCE at 16%, yet financials remain depressed. A sentiment shift in any single mega-cap now carries outsized drawdown risk for the broader ^GSPC given how thin underlying breadth has become.

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Rocky take

NVDA and Four Megacaps Drive Over 40% of S&P 500 YTD Returns, Breadth Deteriorating has gained +0% in mention volume over the past 24 hours. Sentiment is skeptical. Coverage is led by tier-1 financial press with cross-platform amplification.