According to 13-F filings to the SEC, Berkshire Hathaway Inc. and Warren Buffet increased its stake the most among the five blue chip stocks listed below. The list of the five blue chip stocks was compiled by Wall Street Cheat Sheet in terms of dollar value. Wells Fargo & Co (NYSE:WFC)The Coca-Cola Company (NYSE:KO)International Business Machines Corp. (NYSE:IBM)American Express Company (NYSE:AXP)The Procter & Gamble Company (NYSE:PG) Year-to-day, the only stock among the list that has a negative performance rate is IBM. It does hurt to follow to the Oracle once in a while.