Nature of Operations	6 Months Ended
Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Nature of Operations Castellum, Inc. (the “Company”) is focused on building a large, successful technology company in the areas of information technology, electronic warfare, information warfare and cybersecurity with businesses in the governmental and commercial markets. Services include intelligence analysis, software development, software engineering, program management, strategic planning, information assurance and cybersecurity and policy along with analysis support. These services, which largely focus on securing data and establishing related policies, are applicable to customers in the federal government, financial services, healthcare, and other users of large data applications. The services can be delivered to legacy, customer owned networks, or customers who rely upon cloud-based infrastructures. The Company is actively working with business brokers and contacts within their business network to identify potential acquisitions. Since November 2019, the Company has made the following acquisitions that specialize in the areas noted above: •Corvus Consulting, LLC (“Corvus”), •Mainnerve Federal Services, Inc. dba MFSI Government Group (“MFSI"), •Merrison Technologies, LLC ("Merrison"), •Specialty Systems, Inc. (“SSI”), •the business assets of Pax River from The Albers Group (“Pax River”), •Lexington Solutions Group, LLC (“LSG”), and •Global Technology and Management Resources, Inc. ("GTMR"). With the exception of Pax River, all of these acquisitions were considered business combinations under Topic 805 Business Combinations of the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”).

Nature of Operations

6 Months Ended

Jun. 30, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Castellum, Inc. (the “Company”) is focused on building a large, successful technology company in the areas of information technology, electronic warfare, information warfare and cybersecurity with businesses in the governmental and commercial markets. Services include intelligence analysis, software development, software engineering, program management, strategic planning, information assurance and cybersecurity and policy along with analysis support. These services, which largely focus on securing data and establishing related policies, are applicable to customers in the federal government, financial services, healthcare, and other users of large data applications. The services can be delivered to legacy, customer owned networks, or customers who rely upon cloud-based infrastructures. The Company is actively working with business brokers and contacts within their business network to identify potential acquisitions.

Since November 2019, the Company has made the following acquisitions that specialize in the areas noted above:

•Corvus Consulting, LLC (“Corvus”),

•Mainnerve Federal Services, Inc. dba MFSI Government Group (“MFSI"),

•Merrison Technologies, LLC ("Merrison"),

•Specialty Systems, Inc. (“SSI”),

•the business assets of Pax River from The Albers Group (“Pax River”),

•Lexington Solutions Group, LLC (“LSG”), and

•Global Technology and Management Resources, Inc. ("GTMR").

With the exception of Pax River, all of these acquisitions were considered business combinations under Topic 805 Business Combinations of the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”).