42 : Open Systems Technologies Corporation
| Location: | Gainesville, Virginia |
| Annual growth rate: | 41.1% |
| 2018 revenue: | $11837558 |
| 2017 revenue: | $10764079 |
| 2016 revenue: | $8609704 |
| 2015 revenue: | $5498343 |
| 2014 revenue: | $2988377 |
| Leadership: | Thomas R. Truitt |
| Number of employees: | 135 |
| Lines of business: | IT Engineering Services to include Cloud Computing and Cyber-Security Implementation and Integration |
| Major customers: | US Army, US Postal Service, Federal Bureau of Investigation, Department of Homeland Security, Defense Logistics Agency, National Geospatial Agency |
| Major contracts/projects: | Not revealed |