Torsten Slok of Apollo recently shared an eye-opening perspective regarding the current state of market concentration. He points out that the ten largest companies within the S&P 500 now account for almost 40% of the entire index. As demonstrated in the chart below, this top-heavy dynamic could approach 50% if Anthropic, OpenAI, and SpaceX are added to the mix later this year. The primary takeaway from these figures is that the S&P 500 simply does not offer much diversification anymore.

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