---
schema_version: "secwatch.filing_event.v1"
accession: "0000947871-26-000941"
form_type: "8-K"
ticker: "DGX"
cik: "0001022079"
company_name: "QUEST DIAGNOSTICS INC"
filed_at: "2026-10-22T10:53:44+00:00"
generated_at: "2026-10-22T10:55:02.683742+00:00"
event_type: "cyber"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Quest Diagnostics reports unauthorized access to Quanum LSM system; some patient records accessed

## Summary
- On October 21, 2026, Quest learned of unauthorized access to its Quanum LSM system, which clients use to place test orders and receive and look up results.
- Company believes an unauthorized party accessed certain patient records; the full scope of the access remains under investigation.
- Quest notified federal law enforcement and engaged external cybersecurity experts; incident response procedures were initiated to contain the activity.
- The incident has not materially disrupted business operations or the company's ability to serve patients, according to the filing.

## SEC filing metadata
- accession: 0000947871-26-000941
- form_type: 8-K
- ticker: DGX
- cik: 0001022079
- company_name: QUEST DIAGNOSTICS INC
- filed_at: 2026-10-22T10:53:44+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/1022079/000094787126000941/0000947871-26-000941-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1022079/000094787126000941/ss6979200_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000947871-26-000941
- JSON: https://secwatch.observer/filing/0000947871-26-000941.json
- Plain text: https://secwatch.observer/filing/0000947871-26-000941.txt

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