Tesco (OTCPK:TSCDY -4.2%) - the U.K.'s Wal-Mart, if you will - falls again amidst a report its U.K. CEO unloaded 50K shares a week ahead of yesterday's disastrous sales report that sparked a 16% dive in the shares. A spokesman says the company is confident he had no knowledge of price-sensitive information at the time.