The medusa ransomware group listed BAMSI on its data leak site on 2023-05-15. Sector: Healthcare Domains named: bamsi.org Claim as published on the leak site: BAMSI is a private, non-profit social services organization that provides behavioral health and public health services to adults and children with developmental disabilities and mental illnesses. BAMSI was founded in 1975 and is headquartered in Brockton, Massachusetts, with 50,000 patients served annually.