As of Q4'25 (2026-01-03), ONTO reported an operating income of USD 13.9M, representing a significant decline both sequentially and year-over-year, with the YoY growth rate at -67.4%. This marks the lowest operating income in the observed period, following a sharp drop from the previous quarter’s USD 23.7M. From Q1'23 to Q4'25, ONTO’s operating income exhibited considerable volatility. After a period of strong recovery and growth in 2024—peaking at USD 63.1M in Q1'25 with YoY growth rates exceeding 47%—the trend reversed sharply in the second half of 2025. Operating income declined for three consecutive quarters, with YoY growth turning negative and deepening each quarter, highlighting a pronounced downturn after a period of robust performance.