Onto Innovation Inc. Takes 27% Stake in Rigaku Holdings (268A) | Large Shareholding Report

A large shareholding report (EDINET filing) shows that Onto Innovation Inc. has raised its stake in Rigaku Holdings (268A) to 27%. Rigaku is a precision equipment manufacturer specializing in X-ray diffraction instruments and medical X-ray devices, making Onto Innovation's 27% stake equivalent to roughly one-quarter of the company's outstanding shares and establishing it as a major shareholder. The filer is a venture capital firm focused on digital assets and blockchain-related technologies.

Following the disclosure on April 22, 2026, Onto Innovation's estimated acquisition cost totaled approximately ¥160.28 billion. No previous disclosures by this investor in the company were identified within the past 400 days, suggesting that this represents either a new position or a significant resumption of ownership.

*Speculation: This large investment by a blockchain and digital technology-focused venture capital firm into a precision instrument manufacturer may reflect either a strategic exploration of synergies between Rigaku's analytical equipment and measurement capabilities with digital and blockchain technologies, or a portfolio diversification strategy by the investor.