Costco Wholesale Corporation (COST) closed at $989.11 on October 17, 2026, a gain of 1.15% over the prior 24-hour period. The move extended a broader rally that has lifted the stock 4.47% over the past seven days.
Over the trailing 30-day period, shares have climbed 10.73%, reflecting sustained buying interest in the warehouse retailer. The company's market capitalization stood at $433.38 billion as of the close.
The single-session gain placed COST among the steadier performers in large-cap retail, with its market value holding firmly above the $433 billion threshold. The 30-day advance of 10.73% represents one of the more notable moves for the stock in recent weeks.
No corporate announcements or earnings events were cited in connection with the day's price movement. The data reflects closing market figures as of October 17, 2026.
