secwatch.observer — SEC 8-K summary
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Issuer:     ONTO INNOVATION INC. (ONTO)
CIK:        0000704532
Form:       8-K
Filed at:   2026-08-10T12:16:49+00:00
Accession:  0001193125-26-341337
Event type: m_and_a
Sentiment:  positive
Materiality: 0.75
Item codes: 2.01, 7.01, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

Onto Innovation closes $720M purchase of 27% stake in Rigaku Holdings
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- Completed purchase of 61,123,436 Rigaku shares (27% of outstanding) from Atom Investment, a Carlyle affiliate, for ~$720M (¥113.08B).
- Investment deepens strategic collaboration on X-ray process control for semiconductor manufacturing; first announced April 2026.
- Onto will account for investment under fair value option, not consolidate Rigaku; will nominate a director to Rigaku's board.
- CEO Mike Plisinski says investment accelerates innovation and enhances holistic process control solutions for next-gen chips.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/704532/000119312526341337/0001193125-26-341337-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/704532/000119312526341337/d125405d8k.htm
  HTML page:      https://secwatch.observer/filing/0001193125-26-341337

License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer