Berkshire Hathaway's billionaire chief increased his company's stake in this unique business to more than 37%!

Among Wall Street's most successful money managers, arguably none captivates the attention of professional and retail investors quite like Berkshire Hathaway 's ( BRK.A 1.49% ) ( BRK.B 1.35% ) Warren Buffett. The more than 5,600,000% aggregate return the aptly nicknamed "Oracle of Omaha" has overseen in his company's Class A shares (BRK.A) since becoming Berkshire's CEO six decades ago is why investors follow his every move.

The easiest way to track which stocks Buffett is buying and selling is to peruse Berkshire Hathaway's quarterly Form 13F filing , which is coincidentally set to be released following the closing bell tomorrow (Aug. 14). A 13F is a required fi

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