Castellum is a defense-focused technology company based in Vienna, Virginia. The firm provides Cybersecurity, Software Development, Systems Engineering, and Information/Intelligence Analysis services to the federal government, with work spanning electronic warfare, AI/ML, data analytics, and digital modernization across the C5ISR domain.
The company has grown through the integration of seven acquisitions. Its recent contract wins include a $103.3 million Special Missions support award and a $66.2 million logistics and cyber support services contract. Castellum reported revenue of $52.9 million in 2025, with a record backlog of $273.3 million.
