Warren Buffett’s latest stock picks are out, and Wells Fargo & Co (NYSE:WFC) is still his No. 1. Buffett holds $19.1 billion in the bank, which is followed by a $15.1 billion stake in The Coca-Cola Company (NYSE:KO), and a $12.6 billion stake in International Business Machines Corp. (NYSE:IBM). Buffett also holds $11.4 billion in American Express Company (NYSE:AXP), and generally speaking, this top 4 is unchanged over the quarter. The major news from this filing is a new stake in Exxon Mobil (NYSE:XOM) worth $3.7 billion, which of course, he dumped in the last quarter of 2011.