Judging by the disclosed holdings in the Gates Foundation (formerly called the Bill and Melinda Gates Foundation Trust), one would think that billionaire Bill Gates is a big fan of Warren Buffett. According to its latest 13F filing, the foundation run by Gates owns a huge amount of Buffett's holding company, Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B).

Right now, the largest stock position in the $46 billion trust's publicly disclosed portfolio is . Gates co-founded Microsoft back in 1975 and in 2010 he committed to donating his entire stake in Microsoft to charity by the time he died. As a result, much of the foundation's holdings in Microsoft came from Gates' donations over the years. Today, the trust's stake in Microsoft is valued at around $15.4 billion.

Berkshire Hathaway, meanwhile, is the third-largest position in the trust's portfolio at around $7.3 billion. Most of those Berkshire shares were donated to the foundation by Buffett.

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Source Fool.com