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Heywood cybersecurity incidents and threat signals
heywood.org
This company page brings together public reporting currently associated with Heywood. It reflects signals published by Shadow Tier and should not be read as a complete incident history.
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June 25, 2026
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Based on all published signals currently linked to Heywood. Affected countries come from victim data; the company country above remains a separate profile fact. Counts describe this reporting set, not overall incident prevalence.
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Heywood Healthcare Cyberattack Disrupts Hospitals, Exposes Patient Data
On October 12, 2025, Heywood Healthcare, encompassing Heywood Hospital and Athol Hospital, experienced a network outage due to a cyberattack. The incident disrupted critical services including radiology, lab services, and email, leading to a 'Code Black' and the diversion of ambulances. The Sinobi ransomware group later claimed responsibility for the attack, threatening to publish 550GB of stolen data. Potentially exposed information includes names, dates of birth, Social Security numbers, driver's license or state ID numbers, medical records, health insurance details, and contact information.
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Questions about Heywood cybersecurity reporting
What does the Heywood page include?
It combines a reviewed organization profile with all current published Shadow Tier signals explicitly linked to Heywood.
Does every mention of Heywood appear here?
No. A signal must contain a reliable company connection and meet the publication criteria; incidental or ambiguous mentions are excluded.
Why can the incident count change?
The page follows current published reporting. Counts change as new evidence is added, classifications are reviewed, or older signals leave the reporting window.