The sinobi ransomware group listed heywood.org on its data leak site on 2025-11-19. Country: US Sector: Healthcare Domains named: heywood.org Claim as published on the leak site: A member of the Heywood Healthcare system, Heywood Hospital is an acute care hospital in Gardner, MA, providing a broad range of high quality medical, surgical, obstetrical, pediatric and behavioral health services on an inpatient and outpatient basis.