Wal-Mart ( WMT) said same-store sales last week were at the low end of its expected December growth range of 3% to 5%. In a weekly update, the company said sales of holiday products perked up last week after trailing expectations earlier in the month, and were now on track to come in close to forecasts. The company still expects overall December same-store sales to be in the previously offered range. The company also filed a shelf registration with the SEC covering $10 billion of debt securities for corporate purposes and 16 million common shares owned by Walton Enterprises LP, a partnership representing interests of the company's founding family. The shares registered will be sold from time to time over the next six to 12 months to fund charitable programs.