Warren Buffett has displayed an impressive ability to buy quality companies and hold on to their winners for the long haul. Since Buffett assumed the role as chief executive officer at Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) in 1965, the stock has returned investors nearly 20% annually. In other words, a $100 investment in the company when Buffett took over would be worth $2.4 million today!

Berkshire Hathaway has become one of the world's largest companies today, partly because of its significant investment portfolio and Buffett's stock-picking prowess. However, there are some things you may not know about the business. Here are three that the smartest investors know about Berkshire Hathaway.

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Source Fool.com