The industries represented in the IBD 50 are fragmented: No more than two stocks from any single group appear on the list. Often, a few industries assert themselves, accounting for at least three names in IBD's screen of top-performing stocks. Sometimes, they're accompanied by leaders from similar industries. In June, for example, discount and variety retailers Family Dollar (FDO), Dollar General (DG) and Dollar Tree (DLTR) were all IBD 50