Castellum

Castellum targets small to midsized U.S. federal government contractors with active contract vehicles, security clearances, and prime contractor status — particularly in cybersecurity, information warfare, and software engineering. The firm looks for companies generating $2–$10 million in annual revenue that lack the scale to pursue larger procurement opportunities independently. Once acquired, these subsidiaries are integrated into a platform that can bid for higher-value task orders from agencies like the Department of Defense and the U.S. Navy.

Castellum is a publicly traded company (NYSE American: CTM) rather than a private fund, which means it has permanent capital and public equity to deploy for acquisitions. Its leadership team is drawn heavily from former military and defense professionals — President Glen Ives was a naval aviator and commanding officer — rather than from a financial sponsor background. This gives the company operational credibility with government procurement officers that a typical PE-backed consolidator might lack.

Chairman and CEO Mark Fuller leads strategic direction and acquisition sourcing, while President and COO Glen Ives runs operational integration and government customer relationships. Ives joined in 2021 after a career that included commanding officer roles in the U.S. Navy. The senior team is intentionally staffed with former military officers, which Castellum's filings describe as a competitive advantage when navigating the Department of Defense's procurement culture.

Castellum focuses narrowly on federal IT, cybersecurity, and defense-related technology services — it does not pursue commercial enterprise IT, consumer software, state and local government contracts, or international government work. The company's filings describe its addressable market as U.S. federal agencies with national security missions, primarily the Department of Defense.

Known subsidiaries from public announcements and SEC filings include Mainnerve Federal Services (cybersecurity services), Merrison Technologies (IT and cloud services for defense clients), Corvus Consulting (systems engineering and program management), and Lexington Solutions (software development and data analytics). These were all acquired between 2020 and 2021. Castellum has signaled it intends to add further operating units through its 2024 shelf registration.