---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-034334"
form_type: "8-K"
ticker: "MKSI"
cik: "0001049502"
company_name: "MKS INC"
filed_at: "2023-02-13T23:59:59+00:00"
generated_at: "2026-06-19T15:29:02.859583+00:00"
event_type: "cyber"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# MKS reschedules earnings due to ransomware; Vacuum & Photonics divisions materially impacted

## Summary
- Ransomware event identified Feb 3; Q4/FY 2022 earnings call rescheduled to Feb 28, 2023.
- Incident materially impacted Q1 ability to process orders, ship products, and service customers in Vacuum and Photonics Solutions divisions.
- Materials Solutions Division operations not impacted; full cost and insurance offset not yet determined.
- Company continues recovery phase; postponed earnings to better assess financial impact.

## SEC filing metadata
- accession: 0001193125-23-034334
- form_type: 8-K
- ticker: MKSI
- cik: 0001049502
- company_name: MKS INC
- filed_at: 2023-02-13T23:59:59+00:00
- event_type: cyber
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1049502/000119312523034334/0001193125-23-034334-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1049502/000119312523034334/d464518d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-034334
- JSON: https://secwatch.observer/filing/0001193125-23-034334.json
- Plain text: https://secwatch.observer/filing/0001193125-23-034334.txt

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