Serco Group plc operates primarily through business-to-government (B2G) contracts, offering a wide range of managed services. Its business segments include Defence (base support, maritime, and space services), Justice & Immigration (custodial services, asylum seeker accommodation, and detainee transport), Transport (air traffic control, road traffic management, and rail operations), Health (facilities management and patient administration), and Citizen Services (contact centers and IT support). The company generates revenue through long-term, multi-year contracts with national and local governments. Geographically, its operations span the UK & Europe, North America, the Asia Pacific region, and the Middle East.