Wal-Mart Stores, Inc. reported net sales for the four-week period ending May 4, 2001, of $16.164 billion, an increase of 13.9 percent over the $14.196 billion in the similar period in the prior year. Sales for the thirteen-week period were $49.819 billion, an increase of 12.3 percent over the $44.380 billion in the similar period in the prior year.