Warren Buffett, the CEO of Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B), is known as the Oracle of Omaha. That's a testament to his investment acumen, which has led Berkshire Hathaway stock to trounce the returns of the S&P 500 index over the long term. But you shouldn't chase returns here. Berkshire Hathaway is not a stock you should own unless you really understand the company. Here's why you might not want to buy this Wall Street icon.

Although Berkshire Hathaway has resoundingly beaten the S&P 500 over the long term, that is all historical performance. And as every investor is warned, past performance is not a guarantee of future returns.

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Source Fool.com