 Wallace Weitz Trades, Portfolio, leader of Weitz Investment Management, disclosed this week that his firms top five trades during the fourth quarter of 2020 included position reductions in Berkshire Hathaway Inc. NYSE:BRK.ANYSE:BRK.B and Redwood Trust Inc. NYSE:RWT and boosts in three positions: Aon PLC NYSE:AON, Fidelity National Information Services Inc. NYSE:FIS and CarMax Inc. NYSE:KMX. 