S&P 500 Market Concentration Deepens Amid Big Tech and AI Momentum

TLDR: Five mega-cap tech stocks accounted for nearly half of the S&P 500’s gains since April 1, 2026. The equal-weighted S&P 500 rose just 6%, lagging behind the benchmark’s 12% market rally. AI optimism continues directing institutional and retail capital into dominant technology firms. Narrow market leadership raises concerns over rising dependence on a handful

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