Onto Innovation is trading 5.2% down at $293.20 as semiconductor stocks continued selling off amid elevated Treasury yields and renewed Middle East uncertainty.
- Reuters reported the 30-year Treasury yield remained near its highest level since 2007 on August 19; broader reporting linked rising oil prices and borrowing costs to technology-stock weakness.
- The stock fell an additional 10.18% on August 18, indicating continued sector-wide pressure rather than a new company-specific announcement.