---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-236464"
form_type: "8-K"
ticker: "ONTO"
cik: "0000704532"
company_name: "ONTO INNOVATION INC."
filed_at: "2025-10-10T23:59:59+00:00"
generated_at: "2026-05-17T04:07:38.752653+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Onto Innovation amends Semilab deal; excludes EIR business, price cut ~$50M to ~$495M

## Summary
- EIR business (Fourier-Transform IR reflectometry) excluded; seller retains it; ~$13M (10% of Semilab 2025 revenue).
- Base cash price reduced to $432.3M plus 641,771 shares; total ~$495M from originally ~$545M.
- Acquired business (ex-EIR) expected to generate ~$120M annual revenue and be ~10% EPS accretive in year one.
- DOJ issued Second Request; parties will refile HSR with revised scope, still targeting 2025 close.
- Onto affirms Q3 FY2025 guidance (August 7, 2025); deal expected to close in 2025.

## SEC filing metadata
- accession: 0001193125-25-236464
- form_type: 8-K
- ticker: ONTO
- cik: 0000704532
- company_name: ONTO INNOVATION INC.
- filed_at: 2025-10-10T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 1.01, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/704532/000119312525236464/0001193125-25-236464-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/704532/000119312525236464/onto-20251009.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-236464
- JSON: https://secwatch.observer/filing/0001193125-25-236464.json
- Plain text: https://secwatch.observer/filing/0001193125-25-236464.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.