The latest data point for ASML's Return on Sales (ROS) in Q4'25 stands at 35.47%, reflecting a modest uptick from the prior quarter and indicating sustained profitability amid market fluctuations. Over the period from Q2'23 to Q4'25, ROS exhibited a volatile yet generally stable trend, starting at 33.74% and dipping to a low of 26.87% in Q1'24 before recovering to a peak of 36.82% in Q4'24; subsequent quarters showed minor fluctuations around the mid-30% range, with no clear long-term growth or decline, underscoring resilience in operational efficiency for the semiconductor equipment leader. Note that Q1'26 has no data available.