Unless you invest in cryptocurrencies, the weekend is a time when you don't have to worry about major news releases. The one exception to that rule is Warren Buffett's company, Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B), which has consistently released its quarterly and full-year operating results on a Saturday for a long time.

This past Saturday, Feb. 25, Berkshire Hathaway announced its much-anticipated fourth-quarter and full-year operating results. While most people were focused on Warren Buffett's annual letter to shareholders, which contained nuggets of investing wisdom the Oracle of Omaha has mined over the past 80 years, they may have missed a truly worrisome number buried in Berkshire Hathaway's more than 140-page annual report.

Berkshire Hathaway CEO Warren Buffett. Image source: The Motley Fool.

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Source Fool.com