For nearly six decades, Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) CEO Warren Buffett has been putting on an investment clinic for all to see. Since taking over as the CEO of Berkshire in the mid-1960s, the "Oracle of Omaha," as Buffett has come to be known, has overseen an aggregate return in his company's Class A shares (BRK.A) of almost 4,500,000%, as of the closing bell on Jan. 19, 2024.

Lengthy books have been written highlighting the investing traits Buffett exhibits when picking out winning stocks. However, his penchant for portfolio concentration has been one of the defining factors in Berkshire Hathaway's sustained outperformance. Despite holding stakes in around 50 stocks, just seven core holdings account for 83% ($301.7 billion) of Berkshire Hathaway's $365 billion of invested assets.

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

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Source Fool.com