| Item | Obligations |
|---|---|
| Department of Homeland Security | $559M |
| Department of Defense | $202M |
| General Services Administration | $25.3M |
| Smithsonian Institution | $5.9M |
| Department of Health and Human Services | $1.8M |
| National Gallery of Art | $238K |
| Department of Commerce | -$33.4M |
Department of Homeland Security is Whiting Turner Contracting Company the's largest federal customer, with $559M obligated (73.4% of the company's federal obligations).