In the latest quarter Q4'25, ONTO's Gross Margin stood at 46.4%, Operating Margin at 5.2%, and Net Profit Margin at 3.9%, reflecting a notable contraction across all metrics compared to prior periods and signaling potential pressures on profitability. Over the period from Q1'23 to Q4'25, Gross Margin exhibited volatility, peaking at 54.1% in Q3'24 before declining to 46.4%, with an overall downward trend from an initial 52.7%. Operating Margin showed initial stability around 13-16% in 2023, surged to a high of 23.7% in Q1'25 driven by operational efficiencies, but then plummeted sharply to 5.2% by Q4'25 amid apparent cost challenges. Net Profit Margin followed a similar pattern, reaching 24.0% in Q1'25 after steady growth from 14.6% in Q1'23, only to drop precipitously to 3.9% in the final quarter, underscoring a volatile trajectory with recent declines eroding earlier gains.