CASTELLUM, INC. (CTM) 8-K Summary

Critical Event: On October 31, 2025, Castellum, Inc. announced a major contract award impacting its business outlook.

• Material Contract: Subsidiary SSI was awarded a $66.2 million full and open contract.
• This represents a significant addition to the company’s contracted backlog/revenue visibility.
• Regulatory Note: Castellum confirms status as an Emerging Growth Company and has not elected the extended transition period for new accounting standards.

This filing primarily serves to disclose the execution of this substantial