Buffett loses big on Tesco share dive By: CNBC.com News September 25, 2014 at 06:03 AM EDT Warren Buffett has lost over $700 million on his investment in U.K. supermarket Tesco, which has seen shares fall around 43 percent this year. Read More >> Related Stocks: Berkshire Hathaway Goldman Sachs Group Oracle Corp Tesco Plc ADR Transportation and Logistics Systems Inc