Key Highlights

● ONTO was trading at $204.00 on Thursday, down 8.17%.

● Onto makes metrology and inspection equipment used in chip manufacturing.

● Equipment makers were hit hardest, with Lam Research down around 9%.

● The Nasdaq Composite was the weakest major index, falling 2.60%.

Onto Innovation Inc. (NYSE:ONTO) was swept lower by the semiconductor selloff on Thursday, October 22, 2026, trading at $204.00 after a drop of 8.17%. The company makes metrology-and-inspection equipment used in chip manufacturing, and on a day when that entire corner of the market came under heavy pressure, it had no release of its own to blame. The decline was a sector move, with the stock following the chip-equipment group down as investors backed away from the AI build-out.

Selling Lodged in Chip Stocks

The shape of the session made the concentration of selling plain. The Dow Jones Industrial Average ended essentially flat, up 11.89 points at 52,867.98, while the S&P 500 fell 1.21% to 7,663.45 and the Nasdaq Composite tumbled 2.60% to 26,008.86 to finish as the weakest major index. That divergence is the day in a sentence: the weakness was lodged in technology and semiconductors rather than spread across the broader market. Onto, as a supplier of inspection and measurement tools to chipmakers, sits at the heart of that vulnerable group.

AI Debate Hits Equipment Demand

The day's unease traced back to a renewed debate over the AI trade following earnings from two of the sector's biggest names. Meta (NASDAQ:META) fell roughly 7% despite strong quarterly results and a two-for-one split announcement, and Tesla (NASDAQ:TSLA) ended off about 3% even after an earnings beat, as the market weighed a lighter near-term capital-spending plan against larger outlays promised in future years. The question running beneath the surface was how much will ultimately be invested in AI infrastructure, and how quickly those investments will pay off. For a company whose equipment is bought when chipmakers expand and upgrade capacity, that question is existential to demand.

The selling then cascaded through the chip complex with notable technical force. Semiconductor stocks broke below a key support level during the session, a breakdown that tends to accelerate declines as momentum turns and buyers step back. Equipment makers were hit hardest, with Lam Research (NASDAQ:LRCX) down around 9% and Applied Materials (NASDAQ:AMAT) and KLA (NASDAQ:KLAC) off roughly 6%, while a spread of chip names fell four to five percent and Nvidia (NASDAQ:NVDA) eased about 2%. Onto Innovation, as a metrology-and-inspection equipment maker, sat firmly among the capital-equipment names that absorbed the heaviest blows.

Tools of Production Sold First

Nothing company-specific drove this decline. Onto reported no earnings, revised no guidance and made no announcement that could be identified as a catalyst. The decline is best read as part of the AI-capex-driven semiconductor selloff, with the stock trading in sympathy with its peers rather than responding to its own fundamentals. Its business, equipment for measuring and inspecting chips during fabrication, is what bound it so tightly to the group: when the market sours on the pace of chip and AI spending, the firms that sell the tools of production tend to be sold first and sold hard.

A Group Affair for Equipment Makers

The rest of the market offered no relief for the name. Treasury yields fell, with the ten-year down about eleven basis points and sliding toward five percent, a move that helped rate-sensitive groups such as homebuilders and housing-related names but left chip equipment untouched. Oil surged to its highest since May on Middle East tensions, while gold and silver posted one of their steepest single-day declines in years, pressuring precious-metals miners. Initial jobless claims fell to their lowest in roughly three months, underscoring that the macro picture was not the problem.

The problem was concentrated and specific: a loss of confidence in AI spending that dragged the equipment makers down together. For Onto Innovation, Thursday was a group affair, and the group had a decidedly bad day.