Warren Buffett's bad week: $2.5B lost on two stocks By: CNBC.com News October 22, 2014 at 09:31 AM EDT Warren Buffett is happy to admit his mistakes when he makes them-just don't remind him how much money he lost in the process. Read More >> Related Stocks: Berkshire Hathaway Coca-Cola Company International Business Machines Tesco Plc ADR Wells Fargo