Quest Diagnostics Incorporated (DGX) — Form 8-K: Current report

Quest Diagnostics Incorporated filed a current report on October 22, 2026, announcing unauthorized access to its Quanum LSM system on October 21, 2026. The company initiated cybersecurity incident response procedures, notified federal law enforcement, and engaged external experts. Quest Diagnostics believes an unauthorized party accessed certain patient records, but the incident has not materially disrupted its business operations or ability to serve patients.