Discount retailer Family Dollar Stores ( FDO) posted fourth-quarter earnings of 75 cents a share on revenue of $2.36 billion, in line with analysts' estimates, and provided an encouraging fiscal 2013 outlook. Shares popped 3.9%. Monsanto ( MON) reported an as-expected fourth-quarter loss amid weaker corn seed sales and provided disappointing fiscal 2013 earnings guidance. Shares fell 2.2%. Xyratex ( XRTX) shares plunged 16.7% after the data storage technology provider posted a fiscal third-quarter earnings decline of 20% amid a significant fall in the company's enterprise storage sales.