The top 10 companies in the S&P 500 make up 35% of the market cap and 23% of the earnings, fueling concerns about over-concentration and bullishness on future earnings from a few firms.
Last year, the tech giants like Apple, Amazon, Alphabet, Meta, Microsoft, Nvidia, and Tesla accounted for half of the S&P's total gains, highlighting the heavy influence of a small group of companies on the index.
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