Castellum

Castellum, Inc. (NYSE-American: CTM) is a defense-focused technology company providing cybersecurity, software development, systems engineering, and information and intelligence analysis services to the U.S. federal government. The company is headquartered in Vienna, Virginia, and works principally with the U.S. Department of Defense and federal agencies. Its shares are listed on NYSE American under the ticker CTM.

The company's work spans a set of technical domains including cybersecurity, software development, systems engineering, electronic warfare, AI/ML, data analytics, digital modernization, C5ISR, and advanced engineering. Service lines include cybersecurity solutions and support services, software and systems engineering for defense customers, electronic and information warfare capabilities, special missions support, and logistics and cyber support services.

Castellum reports a backlog of $273.3 million and revenue of $52.9 million in 2025. Among its contract awards are a $103.3 million special missions support contract and a $66.2 million full and open contract for logistics and cyber support services to the federal government.

The company has grown in part through acquisitions, integrating seven companies over its first four years. Its stated focus areas include national security and support to warfighters.