As of Q4'25 (2025-08-31), Costco's Return on Sales (ROS) stands at 4.13%. This marks the highest value in the observed period, reflecting a continued improvement in profitability. From Q2'23 to Q4'25, the ROS has shown a generally upward trend, rising from 3.65% to 4.13%. There were minor fluctuations, such as a dip to 3.37% in Q3'23 and a slight decrease in Q1'25, but the overall trajectory has been positive. Notably, the most significant growth occurred between Q2'24 and Q3'25, indicating strengthening margins over the last several quarters.