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AI Rally's Breadth Collapses as Mega-Cap Dominance Reaches Records, SPY Concentration Risk Peaks

The week-long artificial intelligence and mega-cap rally stalled Friday as a broader risk-off move exposed extreme concentration in the S&P 500. The top 10 stocks now represent 38% of the index, marking record highs, with breadth deteriorating sharply as smaller-cap and value names diverged downward, signaling rotation fatigue in the most crowded trades.

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AI Rally's Breadth Collapses as Mega-Cap Dominance Reaches Records, SPY Concentration Risk Peaks 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.

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