40% of the S&P 500 value sits in just 10 stocks — and Bitcoin could feel the shock next
The S&P 500 has a concentration problem, and crypto still rides the same plumbing Ten companies have been carrying the S&P 500 like a heavy tool belt, and the weight shows up in one number: about 41% at the end of 2025. As of press time, the top ten add up to about 37.
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