Key Takeaways Costco's U.S. comparable sales rose 5.1% in September, reflecting solid traffic and ticket growth.New shopping hours boosted weekly U.S. sales by about 1% since their late-June rollout.Costco enters the holiday season strong as members seek quality, value and convenience.Costco Wholesale Corporation’s (COST) U.S. comparable sales rose 5.1% in September, indicating consumer strength and a preference for value heading into the holiday season. The performance suggested solid traffic growth and a ...