| Location: | Gainsville, Va. |
| Annual growth rate: | 23.1% |
| 2019 revenue: | $12,617,695.00 |
| 2018 revenue: | $11,787,019.00 |
| 2017 revenue: | $11,043,844.00 |
| 2016 revenue: | $8,609,704.00 |
| 2015 revenue: | $5,498,343.00 |
| Leadership: | Thomas R. Truitt |
| Number of employees: | 135 |
| Web site: | https://www.ostcorpweb.net/ |
| Lines of business: | Identity and Access Management (IAM), Cyber Security Services, Cloud Computing Services |
| Major customers: | US Army, FBI, Defense Logistics Agency, DHS, DISA, DSS, NGA |
| Major contracts/projects: | Undisclosed |