In the latest fiscal period Q3'26, Costco (COST) reported an Operation Income of 2.81B USD. This represents a year-over-year (YoY) growth of 11.26%, continuing the company's steady profitability trend. The chart data from Q4'23 to Q3'26 reveals a consistent upward trajectory in operating performance, characterized by recurring seasonal peaks in the fourth quarter of each fiscal year. Notably, the Operation Income grew from 2.78B USD in Q4'23 to a peak of 3.34B USD in Q4'25, while maintaining robust double-digit YoY growth rates for most of the period. This sustained growth, particularly the 30.85% YoY surge in Q3'24, underscores strong operational efficiency and scalable earnings across the analyzed timeframe.