When Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) CEO Warren Buffett speaks, investors of all walks pay attention. That's because the Oracle of Omaha has been running circles around Wall Street's major indexes for more than a half-century. Since taking the reins at Berkshire, Buffett has doubled the annualized total return, including dividends, of the benchmark S 500 (19.8% vs. 9.9%), as of the end of 2022.

Yet what's particularly noteworthy about Buffett's success is that it's the result of prescient investments in a relatively small number of companies. Based on a combination of reported and estimated cost bases, Wall Street's most-revered investor and his team are sitting on $196.2 billion in unrealized gains (not counting dividends received) from just four well-known companies.

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

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Source Fool.com