 According to GuruFocus Guru Scoreboard, where users can sort investing gurus based on their performances over specific periods of time, one of the top-performing gurus of all time is Warren Buffett Trades, Portfolio, who has grown Berkshire Hathaway BRK.ABRK.B at an average rate of 18.80 per year since 1980. Buffett is well-known not only for his investing expertise, but also for turning Berkshire from a struggling textile business to an incredibly well-run conglomerate of successful cash-generating businesses. 