Rising S&P 500 concentration was rational - but mega-cap earnings dominance is now fading

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Publication date: 13 July 2026

Published by: Guinness Global Investors

After a volatile start to 2026, US equity markets have returned to a familiar pattern, with mega cap stocks reasserting their leadership and index concentration rising to levels last seen during the financial crisis. We analyse whether this is due to genuinely improved earnings, and the early signs that this growth is beginning to broaden.

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