Onto Innovation is trading 4.91% up now at $348 after closing at $331.71 on August 14, 2026; no fresh company-specific announcement or clearly documented catalyst for August 17, 2026 was found.
- Second-quarter revenue reached a record $343 million.
- Backlog exceeded $1.1 billion.
- These bullish fundamentals were reported earlier in August and do not clearly explain this pre-market move.