Onto Innovation is trading 10.12% down now at $252.79 after investors repriced semiconductor and AI-infrastructure demand on September 14, 2026, amid sector-wide weakness and concerns about advanced AI development.
- Reuters reported that Anthropic’s CEO urged companies to slow advanced AI development, pressuring chip stocks broadly.
- The Philadelphia Semiconductor Index fell about 6% as chipmakers bore the brunt of the selloff.
- No clear company-specific announcement or earnings catalyst was identified.