---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-024904"
form_type: "8-K"
ticker: "MKSI"
cik: "0001049502"
company_name: "MKS INC"
filed_at: "2023-02-06T23:59:59+00:00"
generated_at: "2026-06-19T23:44:02.371337+00:00"
event_type: "cyber"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# MKS Instruments discloses ransomware incident; temporarily suspends operations at certain facilities

## Summary
- On Feb 3, 2023, MKS identified a ransomware event and activated incident response and business continuity protocols.
- Incident has affected certain business systems, including production-related systems; company temporarily suspended operations at certain facilities.
- Company has engaged incident response professionals and notified law enforcement; investigation and assessment are ongoing.
- Full scope of costs and related impacts, including potential cybersecurity insurance offset, has not been determined.

## SEC filing metadata
- accession: 0001193125-23-024904
- form_type: 8-K
- ticker: MKSI
- cik: 0001049502
- company_name: MKS INC
- filed_at: 2023-02-06T23:59:59+00:00
- event_type: cyber
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1049502/000119312523024904/0001193125-23-024904-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1049502/000119312523024904/d420671d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-024904
- JSON: https://secwatch.observer/filing/0001193125-23-024904.json
- Plain text: https://secwatch.observer/filing/0001193125-23-024904.txt

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