Stock concentration shows no signs of stopping:
The top 10 companies' share in the S&P 500 index has reached levels not seen in more than 5 decades.
The top 10 now account for ~34% of the S&P 500 market cap, the most since at least the 1970s’.
In just two years, this percentage has spiked by 10 percentage points.
Even at the peak of the 2000 Dot-com bubble, the weight of the top 10 stocks not break above 30% of the index.
A few stocks effectively *are* the stock market.
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