The deadlock ransomware group listed Summa4 on its data leak site on 2026-06-15. Country: ES Sector: Professional Services Domains named: summa4.es Claim as published on the leak site: SUMMA 4 Asesores Legales y Tributarios is a Madrid-based firm specializing in legal and tax advisory for businesses and high-net-worth individuals. Established in 2008, the firm provides tailored strategies in tax, commercial, and labor law, with a particular focus on family businesses and family offices.