After buying shares at the start of the year, Buffett's reversing course on a longtime holding.

Warren Buffett is widely regarded as one of the best investment managers in the world. He has the track record to back up that reputation, too. The Oracle of Omaha produced an average return of 27.4% per year from 1957 through mid-1965 for Buffett Partnership Ltd. He continued to run the partnership for a few more years before paying out partners' shares of Berkshire Hathaway ( BRK.A -0.97% ) ( BRK.B -1.40% ) , which had already begun its journey of compounding at 20% per year for six decades to follow under Buffett's leadership.

Today, Berkshire Hathaway sports a market cap exceeding $1 trillion, the majority of which stems from its investable assets. Berkshire's marketable equ

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