Buffett has long been a fan of Bank of America, singing the praises of CEO Brian Moynihan time and again, and he's owned the stock since he bought preferred shares of BofA in 2011.

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.'

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 isn’t the only one who likes the energy sector. Alongside Berkshire Hathaway’s huge purchases of Occidental Petroleum shares, insiders at energy companies have been buying large amounts of stock for weeks and selling very little.

One of Buffett's favorite stocks over the last two years is now trading at the lowest price since Buffett started piling into the position. Despite the pullback in price, Buffett's not adding any more to his position,