---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-227915"
form_type: "8-K"
ticker: "ONTO"
cik: "0000704532"
company_name: "ONTO INNOVATION INC."
filed_at: "2026-05-18T11:53:10+00:00"
generated_at: "2026-05-18T11:55:15.151659+00:00"
event_type: "debt"
sentiment: "positive"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# Onto Innovation announces $1.1B convertible notes offering due 2031, $300M share repurchase

## Summary
- Offering of $1.1B aggregate principal amount of convertible senior notes due 2031; option for additional $165M.
- Up to ~$300M of net proceeds used to repurchase common stock concurrently with pricing.
- Remaining proceeds for general corporate purposes, including financing 27% acquisition of Rigaku Holdings.
- Capped call transactions expected to reduce potential dilution upon conversion of the notes.
- Notes are senior unsecured obligations; interest rate, conversion rate set at pricing.

## SEC filing metadata
- accession: 0001193125-26-227915
- form_type: 8-K
- ticker: ONTO
- cik: 0000704532
- company_name: ONTO INNOVATION INC.
- filed_at: 2026-05-18T11:53:10+00:00
- event_type: debt
- sentiment: positive
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/704532/000119312526227915/0001193125-26-227915-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/704532/000119312526227915/d147805d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-227915
- JSON: https://secwatch.observer/filing/0001193125-26-227915.json
- Plain text: https://secwatch.observer/filing/0001193125-26-227915.txt

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