Costco Wholesale Corporation (COST) fell 1.53% on Thursday, October 1, 2026, closing at $910.52. The move pushed the stock deeper into negative territory on a monthly basis, with shares now down 3.53% over the past 30 days.
Despite the session weakness, Costco has managed a gain of 0.63% over the trailing seven-day period, suggesting some near-term resilience amid the broader monthly pressure. The warehouse retailer's market capitalization stood at $409.84 billion at the close.
The daily decline reflects continued softness in the shares following a difficult stretch for the stock over the past month. No single catalyst was identified in the available data to account for Thursday's move.
Costco remains one of the largest retailers by market value, and Thursday's closing price of $910.52 reflects the net result of competing pressures across different time horizons, with short-term and medium-term performance trending in opposite directions.
