Castellum

Castellum, Inc. (NYSE-American: CTM) is a defense-focused technology company delivering Cybersecurity, Software Development, Systems Engineering, and Information/Intelligence Analysis services to the federal government. Headquartered in Vienna, Virginia, Castellum provides advanced engineering, cybersecurity, electronic warfare, and mission support solutions to the U.S. Department of Defense and other federal agencies. The company has grown through strategic acquisitions, integrating seven companies over its first four years, and achieved an uplisting to the NYSE American LLC.

The company operates with subsidiaries including Specialty Systems, Inc. (SSI) and GTMR, providing services across critical technology domains such as software and systems engineering, electronic and information warfare, cybersecurity, AI/ML, data analytics, digital modernization, and C5ISR capabilities. Castellum has secured significant government contracts, including a $103.3 million contract for Special Missions support and a $66.2 million full and open contract for logistics and cyber support services. With a record backlog of $273.3 million and revenue of $52.9 million in 2025, Castellum continues expanding its presence in the defense technology sector while maintaining a commitment to national security and supporting warfighters.