Costco stock slips after hours as investors brace for December sales report
Costco shares fell 0.9% to $854.50 in after-hours trading Friday after Telsey Advisory Group projected sharply slower December comparable sales growth ahead of Costco’s Jan. 7 update. Telsey forecast 2.2% total comparable sales growth for December, down from 7.4% a year earlier. Investors are watching traffic, average ticket, and digital sales for signs of early-2026 demand.