Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) CEO Warren Buffett is easily one of the greatest investors of our time. In 58 years since taking the reins, the Oracle of Omaha has led his company's Class A shares (BRK.A) to an aggregate gain of better than 4,100,000%, as of the closing bell on June 23, 2023. In simpler terms, he's doubled up the annualized performance of the broad-based S 500 over a nearly six-decade stretch (19.8% versus 9.9%).

What's particularly interesting about Warren Buffett's investing philosophy is that he's transparent about what he's looking for in businesses. Although the Oracle of Omaha's list of "investing rules" can fill a book, the key points include buying great businesses with well-defined moats and trusted management teams, and holding on to those investments for long periods. He's also a big fan of portfolio concentration -- i.e., putting a sizable percentage of invested assets into your best ideas.

It's a relatively simple investing strategy that anyone can follow. But not even Warren Buffett follows his own investing rules all the time.

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Source Fool.com