The number of ‘negative-beta’ stocks in the S&P 500 just hit a new record high. What that means for investors.

MarketWatch TechAugust 17, 2026en

Here’s another factoid that should get the AI bears excited: Stocks in the S&P 500 are increasingly trading in opposite directions on a given day. That means higher volatility than the performance of the index would lead one to believe.

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