ONTO Surged 26.1% in the Past Month. Can Its Rally Keep Going Strong?

Onto Innovation Inc. ONTO shares have advanced 26.1% in the past month, putting the focus on whether operating momentum can keep pace with a much higher stock price. Record quarterly revenues, margin expansion and rising estimates support the move.

Backlog extending into 2027 and a higher second-half outlook add visibility to the growth case. The offset is valuation. ONTO now discounts substantial execution, leaving less room for customer, cost, or qualification setbacks.

ONTO's Earnings Momentum Supports the Rally

Second-quarter revenues climbed 35.3% year over year to $343.1 million. Non-GAAP earnings of $1.93 per share exceeded consensus by about 15%, while revenues topped management's $320-$330 million guidance range and the $325.6 million consensus mark.

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Advanced Nodes revenues rose 50% sequentially to about $120 million, with memory up roughly 60% and logic more than 40%. Inspection, led by the Dragonfly family, grew 30% sequentially as demand strengthened across 2.5D logic packaging and high-bandwidth memory applications.

Onto's Backlog Extends Growth Visibility

Backlog surpassed $1.1 billion. Management said roughly 60%-70% is tied to 2026 and 30%-40% covers 2027, reflecting customers' willingness to place purchase orders earlier than historical norms to secure supply.

Onto also received more than $200 million of Dragonfly orders from a single outsourced semiconductor assembly and test customer, with most scheduled for 2027. That order timing provides greater visibility, particularly in advanced packaging, where demand had historically been harder to forecast.

ONTO Raises the Bar for the Second Half

Management raised expected second-half revenue growth to more than 25% over the first half, up from its prior 15% outlook. Third-quarter revenues are projected at $380-$400 million, with another sequential increase expected in the fourth quarter.

The third-quarter non-GAAP gross margin target is 57.3%-57.8%, while non-GAAP operating margin is projected at 31.5%-32.5%. Those targets imply further operating leverage, making delivery against the raised revenue and margin expectations central to the next leg of the rally.

ONTO's Premium Multiples Raise the Risk Bar

ONTO trades at 15.2X trailing enterprise value-to-sales, well above its five-year median of 5.7X and the sector's 8.4X. The stock remains below its sub-industry multiple, but its own historical premium has widened materially.

That valuation indicates that substantial growth is already reflected in the shares. Sustaining the premium may require continued upward estimate revisions and consistent execution, because a revenue or margin miss could have a larger effect when expectations are elevated.

Onto's Execution Risks Could Test the Rally

Four customers generated 57.3% of first-half 2026 revenues, leaving Onto sensitive to changes in major customers' capital plans. Trade-policy shifts, material and freight costs, supply-chain pressure and lengthy product qualifications add other execution variables.

KLA Corporation KLAC supplies process-control and process-enabling solutions across wafer, integrated circuit and packaging manufacturing. Nova Ltd. NVMI is another process-control peer, providing material, optical and chemical metrology and reporting record second-quarter sales in advanced-packaging dimensional metrology.

ONTO's Strong Rank Meets Weak Style Scores

The setup remains constructive but not one-sided. ONTO's earnings outlook and backlog support the rally, while premium valuation and customer concentration increase sensitivity to any slowdown in revenues, margins, or estimate revisions.

ONTO currently carries a Zacks Rank #1 (Strong Buy), and the Zacks Consensus Estimate for earnings in the current fiscal year has risen 10.5% in the past month. The stock has a Value Score of F, Growth Score of D, Momentum Score of C and VGM Score of F. The Rank points to favorable near-term estimate-revision momentum, but the weak Value and VGM Scores show that the Style Scores provide limited broad support for the shares at current levels.  You can see the complete list of today’s Zacks #1 Rank stocks here.

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This article originally published on Zacks Investment Research (zacks.com).

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