Valuations back to the dot-com bubble era. But don’t panic yet.

S&P 500’s current multiple reflects the market capitalization-based weighting structure of the index, the increased dominance of some key technology stocks and a few extreme outliers. 

In fact, the equal-weighted version of the index — which puts $10 billion companies on par with $4.3 trillion Nvidia Corp. — has a blended forward price-earnings ratio of just 17.8, a whisker above its 10-year average.
Jonathan Levin Bloomberg September 29, 2025

The S&P 500 has never been this expensive, 
or more concentrated in fewer companies
Huawei Plans Three-Year Campaign to Overtake Nvidia in AI Chips
Bloomberg 23 September 2025



 

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