As of the most recent data point for Q1'26 (2025-09-30), KLAC's Return on Sales (ROS) stands at 43.0%. This marks a notable increase from the previous quarter (Q4'25), where the ROS was 44.2%, indicating a slight decline but still maintaining a strong profitability level. Over the period from Q3'23 to Q1'26, KLAC's ROS has shown a generally upward trend with some fluctuations. After a dip to 30.8% in Q2'24, the metric rebounded steadily, peaking at 44.2% in Q4'25. Despite minor volatility, the overall trajectory suggests improving operational efficiency and profitability, with the latest quarters consistently exceeding 40%. This area chart highlights both the resilience and the positive momentum in KLAC's profitability over the analyzed timeframe.