Onto Innovation Inc. (ONTO) Stock Price & How to Invest

Onto Innovation designs and builds inspection, metrology, lithography, and data-analysis systems that semiconductor manufacturers use to measure and check chips during production. It was formed from the 2019 merger of Rudolph Technologies and Nanometrics, and it competes in areas like thin-film and critical-dimension (OCD) metrology, macro defect inspection, and advanced packaging inspection. Its tools, including the Dragonfly inspection platform and the Atlas and newer G-series metrology systems, are used across advanced logic nodes, specialty devices, and the packaging steps that stitch AI accelerators and high-bandwidth memory (HBM) together.

The investment picture centers on Onto's leverage to two of the fastest-growing corners of chipmaking: advanced packaging (2.5D/3D logic and HBM) and leading-edge logic at gate-all-around nodes. Revenue was roughly $1.0 billion in 2025, and management has guided 2026 revenue above $1.3 billion (over 30% growth), with advanced packaging expected to grow more than 50%. That growth potential comes with the cyclicality, customer concentration, and lumpy order patterns typical of semiconductor capital equipment, so results can swing quarter to quarter even when the multi-year trend is up.

Onto is a semiconductor capital-equipment company, so its revenue is cyclical and can drop sharply in a chip-spending downturn. A large share of sales concentrates in a handful of leading-edge logic and memory customers, so a single customer's capex delay or push-out can move a quarter meaningfully. Its growth thesis leans heavily on AI-driven advanced packaging and HBM demand continuing, which could soften if AI infrastructure spending cools or memory pricing weakens. Gross margin has fluctuated with product mix (it dipped year over year in early 2026 before guided recovery), and export controls on chip equipment sold into China add regulatory uncertainty. Larger, better-capitalized rivals like KLA can also pressure pricing and share.

A simple financial snapshot. These are approximations and refresh quarterly; for current figures see Onto Innovation Inc.'s investor relations page or your broker.

• Revenue (TTM): ~$1.03 billion
• FY2025 revenue: ~$1.005 billion
• Q1 2026 revenue: ~$292 million (record, ~+9.5% YoY)
• Q1 2026 non-GAAP EPS: ~$1.42
• FY2026 revenue guidance: ~$1.3 billion+ (>30% growth)
• Market cap: ~$12.3 billion
• P/E (approx): ~20-25x

Onto trades at a mid-cap valuation that reflects its growth exposure to AI packaging rather than a deep-value multiple. Gross margin has run in the roughly 50-56% range depending on mix, and management guided second-quarter 2026 revenue to $320-$330 million with non-GAAP EPS of about $1.65-$1.73. These figures are as of May 2026 and will change with each quarterly report.

There are three common ways to get ONTO exposure. Buy shares (or fractional shares) directly at any major broker. Hold an ETF that includes it, which spreads the position across many companies. Or build it into a focused thematic basket, so ONTO sits alongside other stocks that express the same thesis.

Walnut takes the basket route. Describe a thesis where ONTO fits (for example “AI infrastructure” or “dividend-growth large-caps”) and the AI proposes 5 to 6 constituents with target weights. You review the plan and fund it through your own broker when you're ready.

ONTO is a specialized semi-cap toolmaker whose story now rides heavily on advanced packaging and HBM demand tied to the AI buildout.

Whether ONTO is worth buying today depends more on your time horizon and what you already hold than on any single call. We walk through valuation, what would have to go right, and the risks in is ONTO a buy?, and where the stock could go from here in the ONTO stock forecast.

For income investors, whether ONTO pays a dividend and how the payout looks is covered in does ONTO pay a dividend?