The Oracle of Omaha has been a net-seller of stocks for 11 consecutive quarters. In May, Wall Street's most-followed money manager, Berkshire Hathaway's (BRK.A -1.27%) (BRK.B 0.18%) CEO Warren Buffett, made waves by announcing his intent to retire from the role of CEO by the end of the year. While not unexpected -- Buffett will turn 95 on Aug. 30 -- it nevertheless raises eyebrows given the Oracle of Omaha's outstanding investment track record, where he's overseen a cumulative return of nearly 5,750,000% in ...