Four times a year, holding companies of a certain size are required to divulge their positions in equities. That's a great thing for followers of Warren Buffett, widely considered the greatest long-term investor of all time. His company, Berkshire Hathaway Inc. (ticker: BRK.B, BRK.A), which he still helms at age 91, owns a sprawling equities portfolio that directly reflects what stocks Buffett likes.