---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-027243"
form_type: "8-K"
ticker: "MKSI"
cik: "0001049502"
company_name: "MKS INC"
filed_at: "2026-01-28T23:59:59+00:00"
generated_at: "2026-05-16T06:51:59.211698+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# MKS prices €1.0B 4.250% senior notes due 2034 to refinance term loans

## Summary
- €1.0B aggregate principal, 4.250% coupon, maturing February 15, 2034.
- Net proceeds ~€985M after discounts and expenses; closing expected Feb 4, 2026.
- Proceeds used to prepay ~$1.3B of USD Tranche B Term Loan and refinance Euro Tranche B Term Loan in full.
- Notes are unsecured senior obligations guaranteed by certain subsidiaries.
- Closing of offering not contingent on concurrently announced Term Loan refinancing.

## SEC filing metadata
- accession: 0001193125-26-027243
- form_type: 8-K
- ticker: MKSI
- cik: 0001049502
- company_name: MKS INC
- filed_at: 2026-01-28T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1049502/000119312526027243/0001193125-26-027243-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1049502/000119312526027243/d85940d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-027243
- JSON: https://secwatch.observer/filing/0001193125-26-027243.json
- Plain text: https://secwatch.observer/filing/0001193125-26-027243.txt

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