Onto Innovation Inc. (ONTO Quick QuoteONTO - Free Report) delivered stronger-than-expected third-quarter 2026 results, with revenues, operating margin and earnings per share exceeding the high end of management's guidance. Strong demand for AI-related semiconductor manufacturing equipment, growing adoption of its Dragonfly inspection platform and rising investments in advanced packaging supported the performance. Revenues reached $410 million, up nearly 90% year over year and 19% sequentially.

Non-GAAP earnings per share increased to $2.44 from 92 cents in the prior-year quarter, while non-GAAP operating margin expanded to 32.6% from 21.1%. Non-GAAP gross margin reached 57.6%, increasing 60 bps sequentially and 360 bps year over year. Continued margin expansion could support further earnings growth if demand remains strong and ONTO maintains operating efficiency. The company's outlook also strengthened, with management raising its fourth-quarter revenue expectations and reporting a record backlog of more than $1.3 billion. Improving customer visibility, expanding product adoption and operational efficiencies are expected to support growth through 2027.

In response to a record third quarter, ONTO’s shares jumped 12% in last day’s trading and closed at $194.04. Shares also went up 6% in pre-market trading today. ONTO’s shares have risen 45.4% in the past year compared with the Zacks Nanotechnology industry’s growth of 46.5%. The company has outpaced the Zacks Computer and Technology sector and the S&P 500 composite’s growth of 6.4% and 0.9%, respectively.

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ONTO’s key competitors include KLA Corporation (KLAC Quick QuoteKLAC - Free Report) , Camtek Ltd (CAMT Quick QuoteCAMT - Free Report) and Applied Materials (AMAT Quick QuoteAMAT - Free Report) . KLAC, CAMT, and AMAT grew 27.1%, 0.9%, and 62%, respectively, over the same period.

However, after this strong performance, investors may question whether ONTO shares still have room to rise. Let's examine the company's growth drivers, financial performance and potential risks to assess its investment prospects.

Strong Q3 Results Highlight ONTO's Growth Momentum

The results reflect strong demand across the company's product portfolio. Advanced packaging and specialty device products were the key contributors, with revenues increasing 35% sequentially. These businesses accounted for slightly more than half of total quarterly revenues, led by continued Dragonfly adoption and a recovery in power and specialty device inspection demand. Advanced-node revenues reached approximately $135 million, with memory contributing about 60% and logic accounting for the remaining 40%. Software and services generated roughly $60 million.

An encouraging indicator is Onto Innovation's backlog, which increased to more than $1.3 billion during the third quarter. Management cited strong customer demand and visibility into investment plans extending multiple years. It expects full-year 2026 revenue growth to exceed 45% year over year and anticipates sequential revenue growth through at least the first half of 2027. These expectations are backed by demand for advanced packaging, increasingly sophisticated logic and memory devices, and inspection technologies that help manufacturers improve process control. Management also expects advanced packaging revenues to grow more than 80% in 2026, while Advanced Nodes revenues are expected to increase more than 35%. These projections highlight the breadth of the company's growth opportunities.

The Dragonfly platform, especially G5, led growth, supporting high-resolution applications with more than 10 customers and orders extending into 2027. The G5 platform is increasingly adopted for new applications, with revenues doubling compared with 2025, while G3 remains relevant for lower-end needs. ONTO also reported strong momentum in power semiconductors and silicon photonics. Combined revenues from these markets doubled in the third quarter, with management expecting significant growth in the fourth quarter and into the first half of 2027.

Onto Innovation Inc. Price and Consensus

Onto Innovation Inc. price-consensus-chart | Onto Innovation Inc. Quote

The strong order visibility prompted ONTO to raise its fourth-quarter 2026 revenue outlook. It expects fourth-quarter revenues of $430-$450 million, representing more than 7% sequential growth at the midpoint. At the midpoint of its guidance, gross margin is expected to improve around 50 bps sequentially to slightly above 58%, while operating margin is projected to reach 34%. ONTO also forecasts non-GAAP EPS of $2.69.

For full-year 2026, management expects revenues of about $1.485 billion at the midpoint, representing growth of more than 45%. Looking ahead, ONTO anticipates sequential revenue growth through at least the first half of 2027, supported by strong customer commitments, broader product adoption and a growing backlog.

What Could Limit ONTO's Growth Upside?

Despite its strong growth outlook, it faces several risks that investors should consider. Onto Innovation faces several cost and operational headwinds, including rising memory and component prices, higher freight expenses, tariffs and dependence on certain single-source components. Although the company is addressing these challenges through product design changes, localized supply chains, supplier partnerships and operational efficiencies, persistent cost pressures or component shortages could affect margins and equipment deliveries.

Demand uncertainty is another risk, as any slowdown or delay in data center and AI infrastructure investments could weaken customer spending and order momentum. In addition, technology transitions, including upgrades to newer inspection systems and evolving advanced packaging methods, require continuous innovation and operational adjustments. While productivity improvements, extended factory models and supply-chain initiatives have helped mitigate these pressures, their impact on profitability and growth remains worth monitoring.

Additionally, the company must manage execution and delivery risks to convert its record backlog into revenues on schedule. Rapid technological changes and competition in inspection and metrology also require continued innovation to maintain its position in advanced packaging and advanced-node markets.

Valuation risk

Strong growth expectations may already be reflected in the stock price. Even solid earnings results may not produce additional upside if expectations are too high. In terms of forward price/earnings, ONTO’s shares are trading at 17.32X, higher than the industry’s 3.37X.

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KLAC, CAMT and AMAT are trading at multiples of 24.44X, 23.72X and 20.12X, respectively.

Estimate Revision Trend for ONTO

Earnings estimates for ONTO have been stagnant for both 2026 and 2027 over the past 60 days.

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ONTO Stock After Q3 Results: Buy, Hold or Sell?

ONTO's record backlog, AI-driven demand and higher 2027 growth visibility support a bullish business outlook, but the stock's valuation and execution risks matter before making a Buy call. Investors should monitor the sustainability of AI-related semiconductor spending, customer investment plans, execution as the company scales and its ability to maintain margin expansion. The company's strong operating outlook is encouraging, but the potential for further stock gains also depends on its valuation and market expectations.

Existing shareholders may consider holding the stock as long as the company's growth outlook remains strong and its valuation is reasonable. With a Zacks Rank #3 (Hold), ONTO appears to be treading in the middle of the road, and new investors may be better off trading with caution. You can see the complete list of today’s Zacks #1 Rank (Strong Buy) stocks here.