Onto Innovation completes $720 million purchase of 27% stake in Rigaku
Onto Innovation closed its previously announced acquisition of a 27% minority equity stake in Rigaku Holdings Corporation from Atom Investment, L.P., an affiliate of The Carlyle Group, for approximately $720 million. The company will account for the stake under the fair value option and will not consolidate Rigaku's results, and it will nominate a director to Rigaku's board.
Key points
- Acquired 61,123,436 Rigaku shares, or 27% of issued and outstanding common stock, under an April 21, 2026 Share Purchase Agreement
- Aggregate purchase price of approximately $720 million, or 113,078,356,600 yen
- Onto will use fair value option accounting and will not consolidate Rigaku's financial results
- Closing completed August 10, 2026 (Tokyo time)
The filing
Written by AI (Anthropic Claude, claude-haiku-5-5) on Nov 8, 2026, 1:17 AM ET, from the text of the filing and its press-release exhibits only. Written later: this filing was briefed after the fact, when past filings were added to the site, so the brief may be read with hindsight; the filing itself is the record of what was known on August 10, 2026.
Briefs are written by AI from the filing text (each brief's own page names the model) and can contain mistakes — open the filing before acting on anything. Impact (1-5) and tone are the model's reading of the filing for shareholders, not a price forecast. Not investment advice.