Costco stock slips after hours as investors brace for December sales report
NEW YORK, Jan 2, 2026, 18:38 ET — After-hours Costco Wholesale Corp shares slipped about 0.9% in after-hours trading on Friday to $854.50, after swinging between $852.59 and $865.23 in the session as the new year opened. Trading volume was about 2.37 million shares, according to market data. The move put focus back on Costco’s next near-term catalyst: its December sales report, due next week, which investors use as an early gauge of holiday demand and momentum heading into 2026. Costco’s monthly sales update is closely watched because it breaks out “comparable sales” — sales at warehouses open at least