At the end of , Buffett's Berkshire Hathaway was the single biggest shareholder in IBM. Berkshire Hathaway still owns 50 million IBM shares, he says.

The reason for the IBM sell-off: He's "revalued it somewhat downward" from six years ago, when he first bought into the company, as " big strong competitors" continue to take wind out of the tech titan's sails. While Buffett didn't appear to name names, cloud computing providers like Amazon Web Services have placed a lot of pressure on server-focused companies like IBM — the same dynamic that led IBM competitor Dell to its mega-merger with fellow server titan EMC.

It hasn't been an easy for IBM, either.

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Back in April, IBM reported earnings that showed its revenue has fallen for 20 quarters straight, now. Still, some Wall Street analysts, at least, believe that IBM is poised for a comeback in the cloud.

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Warren Buffett, IBM's biggest believer, sold a third of his stock in the company. May 5, , 1: African-American inventors who improved the world.

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