The stock market is the most expensive it's been in decades, the billionaire David Einhorn says.His firm, Greenlight Capital, said Warren Buffett's stock sales show now isn't the time for high equity exposure.

Warren Buffett’s Berkshire Hathaway recorded net stock sales totaling $93 billion in the first half of 2024, a company record that points to a lack of buying opportunities. Historically, the S&P 500 has returned a median of 19% during the 12-month period following years in which Berkshire Hathaway was a net seller of stocks.