Warren Buffett's investing track record is tough to match. Since taking over as CEO and chairman of Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) in 1965, he took the struggling textile company and turned it into a massive conglomerate. The share value increased from $18 then to around $580,000 today. That computes to an eye-popping cumulative return of over 3,200,000% and a compound annual growth rate of about 19.4% for the last 58.5 years.

Much of that growth is fueled by Buffett's expansion into the insurance industry and using the float provided by insurance premiums to invest in an equity portfolio (or fully purchasing businesses). So, when Buffett makes a buy or sell decision, the whole investing world pays attention. And there's one stock Buffett has been buying much more than any of the others in Berkshire's portfolio over the last five years.

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Source Fool.com