In Q4'25, ONTO's net income declined sharply to $10.5M USD, marking the lowest point in the observed period and a significant drop from the $64.1M USD peak in Q1'25. From Q1'23 to Q4'25, net income showed overall volatility with an upward trend through 2024, rising from $29.1M USD to a high of $53.1M USD in Q3'24, driven by strong YoY growth exceeding 60% in Q1'24 and Q4'24; however, it reversed in 2025 with YoY declines accelerating to -78.4% in Q4'25, indicating potential challenges in sustaining prior momentum amid fluctuating market conditions.