Warren Buffett first bought shares of International Business Machines (NYSE: IBM) in 2011, building a position worth nearly $11 billion for Berkshire Hathaway (NYSE: BRK-A)(NYSE: BRK-B). The stock has performed poorly since then, leading many to question Buffett’s rare foray into the world of technology stocks. IBM has suffered 16 consecutive quarters of year-over-year revenue declines, and the company expects its earnings to slump this year.