On June 23, Onto Innovation fell 5.71% in pre-market trading, trading at $324.99/share, with turnover of $282,400.

The decline comes amid a broad sell-off across the semiconductor equipment sector. Within the industry, Applied Materials fell 8.15%, ASML declined 7.38%, Lam Research dropped 6.97%, Teradyne slid 6.68%, and KLA-Tencor lost 6.49%, indicating significant sector-wide selling pressure.

The pullback follows a period of extraordinary gains. As of June 20, all nine major U.S.-listed semiconductor equipment companies with market capitalizations exceeding $10 billion had posted year-to-date gains above 75%, with seven — including Onto Innovation — having doubled in price. All nine stocks had reached all-time highs during the prior week, fueled by AI investment demand spreading upstream into wafer fabrication equipment. The current correction appears to represent a sector-level retracement after the rapid run-up, with Onto Innovation having previously traded as high as $348.76 on its 52-week range.

(The above content is based on publicly available market information, generated by a program or algorithm, and is intended solely as a stock movement alert. It does not constitute investment advice or a basis for trading decisions.)