How Many People Work at Leidos? Headcount and Employee Trends

• Leidos (NYSE: LDOS) is a leading provider of information technology and services, specializing in defense, aviation, information technology, and biomedical research, with a market position bolstered by a strong focus on national security and infrastructure solutions.
• In April 2026, Leidos announced a joint venture with Altaris-owned Analogic to enhance global security screening capabilities, contributing approximately 1,500 employees and projected revenue of $625 million for 2026.
• Leidos is partnering with OpenAI to integrate AI technologies into federal operations, aiming to improve efficiency in government agencies and enhance decision-making processes across national security and defense sectors.
• Leidos targets government agencies and defense contractors as ideal buyers, addressing pain points related to operational efficiency, cybersecurity, and information sharing, making their solutions particularly relevant in the current climate of increased focus on national security and technological modernization.

Engineering is the largest function, accounting for about 7,953 employees—nearly two-fifths of total headcount—highlighting the firm’s focus on research, development, and systems integration. Information Technology is the next-largest group at 2,629 employees, supporting enterprise infrastructure and client solutions. Finance & Administration (2,173) and Operations (1,775) supply the backbone for program execution and business continuity, while Business Management, Program & Project Management, and Sales & Support collectively add more than 3,500 employees. Human Resources, Marketing & Product, and an "Other" category round out the roster, pointing to a balanced mix of technical, managerial, and corporate roles.

Leidos maintains a dispersed footprint, with the largest single concentration—about 16,709 employees—classified under "Other," indicating a significant number of staff working at customer sites or remote locations. Washington, DC is the most prominent identifiable hub at 1,807 employees, followed by San Diego, CA (580) and Reston, VA (306). Additional clusters in Huntsville, AL; Arlington, VA; Orlando, FL; Frederick, MD; San Antonio, TX; and Ashburn, VA each host between 180 and 253 employees, illustrating the firm’s presence in key government and defense corridors across the United States.