While Warren Buffett has been willing to adapt to changes in the stock market, he will always at his core be a value investor. Value investing is based on a simple-sounding premise: Buy stocks that are trading at less than their intrinsic value.

Warren Buffett’s Berkshire Hathaway sold its shares of Citigroup during the first quarter, while trimming its stakes in Bank of America and Capital One.

Berkshire Hathaway's latest 13-F filing reveals it doubled the size of its stake in the owner of the Modelo and Corona beer brands in the United States, while dumping its $1 billion stake in Citibank overboard.