Back in 2011, Warren Buffett's Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) bought a 5.4% stake in IBM (NYSE: IBM) at an average price of $170 per share. That $10.7 billion investment surprised many investors since Buffett had famously avoided buying tech stocks throughout most of his career. But by the time IBM's price sunk to the $140s in mid-2018, Berkshire had liquidated its entire position in the aging tech giant.

Today, IBM's stock trades at about $130, so if you had followed Buffett's lead and invested $1,000 into IBM at $170 a share in 2011, your investment would only be worth $765 today. The same investment in an S 500 index fund would have more than doubled. Let's see why Buffett bought IBM, why it underperformed the market, and how Big Blue plans to stage a comeback. 

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Source Fool.com