19 : 1 Source Consulting Inc.
| Location: | Washington, D.C. |
| Annual growth rate: | 114.89% |
| 2009 revenue: | $202,125,070.00 |
| 2008 revenue: | $196,380,865.00 |
| 2007 revenue: | $132,754,376.00 |
| 2006 revenue: | $58,029,186.00 |
| 2005 revenue: | $9,478,111.00 |
| Leadership: | William Teel Jr. |
| Web site: | http://www.1-sc.com |