The kairos ransomware group listed Krapf Group on its data leak site on 2026-09-22. Country: US Sector: Manufacturing Claim as published on the leak site: Founded in 1942 and headquartered in West Chester, Pennsylvania, Krapf Group is a family-owned and operated transportation business. Operates a fleet of more than 2,500 school buses and commercial vehicles with over 3,500 employees. The data also contains personal information about thousands of bus drivers.