| Item | Obligations |
|---|---|
| Department of Defense | $652M |
| Department of Health and Human Services | $202M |
| Pension Benefit Guaranty Corporation | $40.7M |
| Department of Transportation | $33.7M |
| Department of Labor | $31.2M |
| General Services Administration | $13.2M |
| Department of Commerce | $10.1M |
| Environmental Protection Agency | $2.8M |
| Government Accountability Office | $2.6M |
| Department of Homeland Security | $2.5M |
Department of Defense is Serco's largest federal customer, with $652M obligated (65.7% of the company's federal obligations).