ONTO's $720 Million Rigaku Stake Opens a Major New X-Ray Growth Avenue

ONTO Adds X-Ray to Its Process-Control Portfolio

Rigaku gives ONTO access to X-ray technologies that complement its optical process-control tools. Management sees the combination as relevant for complex 3D transistor and advanced-packaging structures, broadening the company's reach across optical, materials, X-ray, inspection and lithography technologies.

KLA Corporation KLAC supplies semiconductor inspection and metrology systems for chip, substrate and advanced-packaging manufacturing. Nova Ltd. NVMI provides material, optical and chemical metrology and process-control solutions, including X-ray fluorescence. Their portfolios frame the competitive setting as ONTO expands its measurement capabilities.

Rigaku Expands ONTO's Served Market

Management estimates the semiconductor X-ray technology market at roughly $1 billion. It expects adoption to increase as more complex 3D transistor and packaging structures create demand for additional process-control techniques.

Customer response to the Rigaku collaboration has been positive. ONTO sees potential benefits from software licensing, additional metrology-tool opportunities and dividend income, but those outcomes remain prospective and depend on successful product development and commercialization.

ONTO Entered the Deal With Ample Liquidity

ONTO ended the second quarter with $1.88 billion of cash and short-term investments. The balance sheet had been strengthened by a $1.5 billion 0% convertible-note offering due in 2031.

The financing generated about $1.2 billion of net cash after share repurchases, capped calls and transaction costs. That liquidity gave ONTO the capacity to fund the Rigaku investment while preserving resources for other corporate needs.

ONTO Still Faces Execution Risk With Rigaku

The 27% Rigaku holding is a minority investment that ONTO will account for under the fair value option, and Rigaku's results will not be consolidated. Strategic value therefore depends on joint development, customer qualifications and adoption rather than immediate consolidated revenue.

Portfolio expansion is already requiring investment elsewhere. Operating expenses increased 6.1% sequentially in the second quarter, while Semilab USA generated $20.7 million of revenue but posted a $4.5 million operating loss. Added technology breadth can take time to translate into operating profit.

Rigaku Fits ONTO's Broader Portfolio Expansion

The Rigaku investment follows ONTO's Semilab acquisition and sits alongside growth initiatives in silicon photonics, Dragonfly inspection and advanced metrology. Together, those moves extend the company's exposure to more stages of semiconductor process control as device complexity rises.

Silicon-photonics orders exceed $50 million, with roughly two-thirds scheduled for 2027. Management estimates ONTO's served addressable market in silicon photonics will exceed $500 million by 2030, providing another expansion path alongside the X-ray opportunity.

ONTO's Short-Term Signal Beats Its Style Scores

The Rigaku stake broadens ONTO's technology portfolio and opens access to a sizable semiconductor X-ray market, but the investment case still hinges on development milestones, customer qualification and commercial adoption. The opportunity is clear, while the timing and earnings contribution remain less certain.

ONTO currently carries a Zacks Rank #1 (Strong Buy), which points to favorable near-term earnings-estimate revisions. The stock has a Value Score of F, Growth Score of D, Momentum Score of C and VGM Score of F. Those weaker Style Scores provide less support across valuation, growth and momentum characteristics, so the Rigaku opportunity should be weighed alongside execution and valuation considerations. 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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