| Location: | Burlington, Mass. |
| Annual growth rate: | 86.59% |
| 2006 revenue: | 9,157,000 |
| 2005 revenue: | 4,516,000 |
| 2004 revenue: | 2,042,000 |
| 2003 revenue: | 1,808,000 |
| 2002 revenue: | 755,500 |
| Leadership: | Chandu H. Shah |
| Number of employees: | 125 |
| Web site: | www.s4inc.com |
| Lines of business: | Enterprise IT solutions, network and information security, systems engineering, professional services, intelligence support |
| Major customers: | Joint Chiefs of Staff, U.S. Strategic Command, Joint Information Operations Center, Air Force, Homeland Security Department |
| Major contracts/projects: | S4 is involved in supporting START Treaty compliance mandates and securing securing connections between test ranges. |