Warren Buffett published his 2012 Letter to Shareholders late last month. In it he announced Berkshire’s intention to increase its ownership of American Express (AXP), Coca-Cola (KO), IBM (IBM) and Wells Fargo (WFC). Skaffold has rated American Express B4 since 2010, Wells Fargo & Co (WFC) A2 since 2011 and IBM A3 for the past two years. Coca Cola (KO) recently fell from B2 to B4 based on its latest financial results. What about Berkshire itself? The stock price recently hit a new high of more than $155,100. According to Skaffold, the intrinsic value of BRK.A is around $67,000.