---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-152097"
form_type: "8-K"
ticker: "ONTO"
cik: "0000704532"
company_name: "ONTO INNOVATION INC."
filed_at: "2025-06-30T23:59:59+00:00"
generated_at: "2026-05-18T15:08:08.046306+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Onto Innovation to acquire Semilab's materials analysis business for ~$545M

## Summary
- Total consideration of $475M cash and 706,215 shares of ONTO stock (~$545M total based on June 27 close).
- Acquisition adds four product lines for inline wafer contamination monitoring and materials interface characterization.
- Portfolio has grown ~20% CAGR since 2021, projected to generate ~$130M annual revenue in 2025.
- Expected to be immediately accretive to gross and operating margins, increasing non-GAAP EPS by >10% in first year.
- Expected close in H2 2025, subject to US and Hungarian regulatory approvals; Q2 2025 guidance reaffirmed.

## SEC filing metadata
- accession: 0001193125-25-152097
- form_type: 8-K
- ticker: ONTO
- cik: 0000704532
- company_name: ONTO INNOVATION INC.
- filed_at: 2025-06-30T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 1.01, 3.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/704532/000119312525152097/0001193125-25-152097-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/704532/000119312525152097/d28444d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-152097
- JSON: https://secwatch.observer/filing/0001193125-25-152097.json
- Plain text: https://secwatch.observer/filing/0001193125-25-152097.txt

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