Onto Innovation is trading 10.07% down now at $199.78 amid a broad semiconductor and AI-stock selloff on October 22, 2026. - No company-specific catalyst was confirmed. - Chip-equipment shares weakened after Lam Research’s results and outlook failed to ease investor concerns about AI spending; renewed Middle East tensions and surging oil added risk-off pressure. - The semiconductor ETF was down 4.20%, alongside declines in major market indexes. Trading volume information was unavailable in the reviewed sources.