| Location: | McLean, Va. |
| Annual growth rate: | 62.33% |
| 2017 revenue: | $48,765,572 |
| 2016 revenue: | $49,877,566 |
| 2015 revenue: | $19,958,290 |
| 2014 revenue: | $7,929,340 |
| 2013 revenue: | $7,023,359 |
| Leadership: | Arria Hines |
| Number of employees: | 225 |
| Web site: | http://www.alleghenyst.com/ |
| Lines of business: | Technology, Engineering and Energy Consulting |
| Major customers: | Department of Energy, Department of Defense, the Intelligence Community (IC) / US Government, Department of Homeland Security, NASA |
| Major contracts/projects: | GSA PSS Schedule, GSA IT70 Schedule |