ONTO INNOVATION INC. Completes 27% Acquisition of Rigaku for ~$720M

What Happened
ONTO INNOVATION Inc. announced on August 10, 2026 that it completed the previously disclosed acquisition of 61,123,436 shares of Rigaku Holdings Corporation, representing approximately 27% of Rigaku’s issued and outstanding common stock. The purchase was made under a Share Purchase Agreement dated April 21, 2026 with Atom Investment, L.P. (an affiliate of The Carlyle Group), for an aggregate purchase price of approximately $720 million. The company also issued a press release the same day announcing the closing.

Key Details

• Acquired 61,123,436 shares of Rigaku common stock — about 27% ownership.
• Aggregate purchase price: approximately $720 million.
• Purchase Agreement dated April 21, 2026; seller: Atom Investment, L.P., an affiliate of The Carlyle Group.
• Closing announced via press release filed as Exhibit 99.1 to the 8-K on August 10, 2026.

Why It Matters
This transaction gives Onto a significant minority ownership stake in Rigaku and establishes an investment/strategic relationship the company expects will provide commercial and technological opportunities. For investors, the key facts to monitor are any disclosures about how Onto plans to leverage this stake, expected synergies or partnerships with Rigaku, and any impact on Onto’s liquidity or debt profile given the ~$720M outlay. The filing also includes customary forward‑looking statement caution and refers investors to Onto’s Form 10‑K and other SEC filings for additional risk factors.