secwatch.observer — SEC 8-K summary
======================================

Issuer:     QUEST DIAGNOSTICS INC (DGX)
CIK:        0001022079
Form:       8-K
Filed at:   2026-10-22T10:53:44+00:00
Accession:  0000947871-26-000941
Event type: cyber
Sentiment:  negative
Materiality: 0.75
Item codes: 8.01
LLM model:  deepseek-v4.1-flash:cloud@v2

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

- 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.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/1022079/000094787126000941/0000947871-26-000941-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/1022079/000094787126000941/ss6979200_8k.htm
  HTML page:      https://secwatch.observer/filing/0000947871-26-000941

License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer