Warren Buffett's company Berkshire Hathaway has built one of the largest and most successful stock portfolios in the world. It's now worth more than $300 billion. It's a great endorsement to be in Berkshire's portfolio. But it can also attract some unwanted attention if Buffett and Berkshire start to sell a stock.

Warren Buffett's Berkshire Hathaway has again sold off shares of Bank of America, as the bank's chief executive called him 'a great shareholder.'

Despite the Oracle of Omaha overseeing stakes in 43 stocks at Berkshire Hathaway, more than half of his portfolio can be traced to three brand-name businesses.

Warren Buffett is the most famous investor in the world. He's known for several reasons, including his favorite holding period, which is forever. For those trying to emulate Buffett's investing style,