| Item | Obligations |
|---|---|
| Department of Defense | $494M |
| Department of Health and Human Services | $202M |
| Pension Benefit Guaranty Corporation | $39.9M |
| Department of Transportation | $26.5M |
| Department of Labor | $14.2M |
| General Services Administration | $12.6M |
| Department of Commerce | $9.1M |
| Government Accountability Office | $2.6M |
| Environmental Protection Agency | $1.6M |
| Department of the Interior | -$8.3K |
Department of Defense is Serco's largest federal customer, with $494M obligated (61.8% of the company's federal obligations).