Leidos Holdings is a government and commercial services company that provides digital modernization, mission software, cyber operations, and advanced hardware and software solutions to U.S. government agencies, allied nations, and commercial customers. Operating through four business segments—National Security & Digital, Health & Civil, Commercial & International, and Defense Systems—the company serves the Department of Defense, intelligence agencies, federal civilian departments, and commercial clients through a workforce that delivers technology-enabled services spanning intelligence analysis, healthcare systems, transportation infrastructure, energy modernization, and specialized defense solutions. The company generates revenues primarily through various government contracting mechanisms including cost-reimbursement, fixed-price, and time-and-materials arrangements, with the substantial majority of revenues derived from U.S. government contracts.