Costco Wholesale's (NYSE:COST) short percent of float has risen 11.49% since its last report, with 4.28 million shares sold short, which is 0.97% of all regular shares available for trading. It would take traders 2.46 days to cover their short positions on average. An increase in short interest can signal that investors have become more bearish. However, Costco's short interest as a percentage of float is less than its peer group average of 3.49%.