Castellum
Castellum is a U.S. federal government contractor providing cybersecurity, software development, systems engineering, information/electronic warfare, and program support services to the Department of Defense, Navy, Missile Defense Agency, and Intelligence Community through its Corvus Consulting, SSI, and GTMR subsidiaries.
- Company typePublic
- Founded2019
- HeadquartersBethesda, United States
- Headcount51–100
- GTM typeB2B
- OfferingServices
What Castellum does
Castellum, Inc. (NYSE-American: CTM) is a U.S. federal government contractor providing cybersecurity, software development, systems engineering, information/electronic warfare, program support, and data analytics services to the Department of Defense, Intelligence Community, Missile Defense Agency, and federal civilian agencies. The company is organized around three core operating subsidiaries — Corvus Consulting (cyberspace operations, electronic warfare, information operations, intelligence), Specialty Systems, Inc. (technical services and software support for naval aviation), and GTMR, Inc. (engineering, logistics support, and operational test and evaluation) — supplemented by joint venture vehicles (CTM JV, C-K2, Epic Specialty Systems) that broaden access to set-aside and mentor-protégé contract work. Castellum holds positions on multiple IDIQ contract vehicles including the Missile Defense Agency SHIELD MAC and the U.S. Navy Logistics IT Integration and Support MAC ($250M ceiling), and has achieved CMMC Level 2 C3PAO certification enabling it to both perform on and assess DoD cybersecurity work.
The company generates revenue almost exclusively through federal prime contracts and subcontracts awarded under competitive bidding, IDIQ task orders, and negotiated procurement processes, with multi-year service contracts as the primary revenue mechanic. Pricing is not publicly disclosed and is determined through federal acquisition regulation processes. Castellum grew from $44.8M in 2024 revenue to $52.9M in 2025 (15.2% growth), with Q1 2026 revenue up 23% year-over-year at $14.3M, supported by a record backlog of $273.3M as of March 31, 2026 and a qualified pipeline of $938M. The company achieved its first GAAP net income in Q3 2025, retired all debt by February 2026 (ending 2025 with $14.9M in cash), and is positioned as a roll-up platform that has executed six acquisitions since 2019 alongside organic contract growth.
Castellum firmographics
Firmographics- Name
- Castellum
- Legal name
- Castellum Inc.
- Website
- https://castellumus.com
- Company type
- Public
- Founded year
- 2019
- Operating status
- Operating
- Headcount range
- 51–100 employees
- Short description
- Castellum is a U.S. federal government contractor providing cybersecurity, software development, systems engineering, information/electronic warfare, and program support services to the Department of Defense, Navy, Missile Defense Agency, and Intelligence Community through its Corvus Consulting, SSI, and GTMR subsidiaries.
- Ownership category
- akta.pro rank
Castellum industry classification
Industry- Product category
- Defense Technology Services
- NAICS
- National Security (928110), Management, Scientific, and Technical Consulting Services (5416), Management Consulting Services (54161)
- SIC
- Services-Engineering, Accounting, Research, Management (8700), Services-Management Consulting Services (8742)
- akta.pro primary industry
- Cyber Defense & Information Security (National Security) (BPAIAHAE)
- akta.pro secondary industries
- Cybersecurity Operations Outsourcing (SOC / SecOps) (BPAEAMAG), Privacy, Data Protection & Cyber Governance (GRC) (BPAHAFAF)
Keywords
Where Castellum is headquartered
LocationHeadquarters
- HQ city
- Bethesda
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Castellum business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure
Revenue model
- Federal Government Contracts: Castellum generates the majority of revenue through prime contracts and subcontracts with U.S. federal government agencies, including the Department of Defense, Intelligence Community, and civilian agencies. Revenue is derived from long-term service contracts for cybersecurity, software development, systems engineering, and program support.
- Defense Technology Services: Specialized engineering and technical services provided to defense agencies including logistics IT, software support, and systems integration under multi-year government contracts.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Government contracting pricing - contract-based |
Go-to-market motion2 records
Distribution channels4 records
Marketing channels4 records
Castellum product offering
Product offeringCore offering
Castellum provides Cybersecurity, Software Development, Systems Engineering, Information/Electronic Warfare, Program Support, and Data Analytics services to U.S. federal government and commercial clients. The company delivers subject-matter expertise in artificial intelligence/machine learning, 5G technologies, model-based systems engineering, program management, information assurance, intelligence analysis, and CMMC compliance. Services are executed through wholly-owned subsidiaries (Corvus Consulting, Specialty Systems, Inc., and GTMR, Inc.) and joint ventures supporting national security missions.
Product overview
Castellum is a technology services company (not a product company) that provides a portfolio of professional services to US government and commercial clients. The company operates through three main subsidiaries: Corvus Consulting (Cyberspace Operations, Electronic Warfare, Information Operations), Specialty Systems, Inc. (software support and technical services since 1978), and GTMR, Inc. (engineering services, logistics support, and test & evaluation). Castellum's core service offerings include Cybersecurity, Software Development, Systems Engineering, Information/Electronic Warfare, Program Support, and Data Analytics, supplemented by subject matter expertise in AI/ML, 5G technologies, and CMMC compliance. The company focuses on helping solve national security challenges through information technology.
Differentiator
Problem solved
Functional benefit
Products and services
- Cybersecurity Services Provides cybersecurity services to U.S. government and commercial clients, including information assurance and CMMC compliance support.
- Software Development
- Systems Engineering
- Information/Electronic Warfare
- Program Support
- Data Analytics
- Corvus Consulting Services Specializes in Cyberspace Operations, Electronic Warfare, Information Operations, Intelligence, and Joint/Electromagnetic Spectrum Operations for federal government and commercial clients. Acquired by Castellum in November 2019.
- Specialty Systems, Inc. (SSI) Services Provides innovative technical services and solutions, including software support and complex technical solutions for government customers. Operates since 1978; acquired by Castellum in August 2021.
- GTMR, Inc. Services Global Technology and Management Resources subsidiary providing engineering services, logistics support, and operational test and evaluation services. Acquired by Castellum in March 2023.
Quantifiable outcome
- Record backlog of $273.3 million as of March 31, 2026
- +4 more outcomes
Companies that use Castellum
Customer profileNamed customers5 records
Segments3 records
Ideal customer profiles3 records
Castellum technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature5 records
Castellum partnerships and signals
Strategic signalPartnerships
Three partnerships are on record, tiered core and minor.
- U.S. NavycoreCastellum's joint venture CTM JV, LLC was awarded a position on the U.S. Navy's Logistics IT Integration and Support (LIIS) Capability Modernization, Deployment, and Support Multiple Award Contract with maximum potential value of approximately $250 million.
- Missile Defense AgencycoreCastellum subsidiary Specialty Systems, Inc. and joint ventures (CTM JV, C-K2, Epic Specialty Systems) were awarded positions on the MDA SHIELD Multiple Award IDIQ contract vehicle for developing advanced multi-domain defense systems to detect and neutralize missile threats using AI/ML and digital engineering.
- Ioffice Business GroupminorIoffice Business Group acquired United Spaces from Castellum, creating Sweden's largest flexible workspace group managing approximately 67,500 square meters of flexible workspace. This represents a divestiture of Castellum's Swedish coworking operations.
Scale indicators10 records
Recent moves7 records
Expansion highlights5 records
Castellum competitors and assessment
Company assessmentBroad incumbents
- CACI International: Federal IT and national security services company with strong electronic warfare, signals intelligence, and cyber practices serving the Navy, Army, and intelligence community. Competes on similar DoD and IC IDIQ task orders and shares a focus on cyber, EW, and information operations work.
- KBR (including ManTech legacy): Global federal and government services contractor following the ManTech acquisition, with deep Navy, intelligence community, and defense cyber practices. Overlaps with Castellum in Navy logistics IT, mission solutions, and cyber operations, and competes for similar DoD IDIQ task orders.
- Booz Allen Hamilton: Large publicly traded federal services and consulting firm with deep Navy, intelligence community, and cybersecurity practices. Directly competes for many of the same DoD and IC task orders Castellum pursues, albeit across a much broader portfolio and at substantially larger scale.
- Peraton: Federal IT and national security contractor with significant intelligence community, DoD, and homeland security work in cyber, electronic warfare, and systems integration. Competes for the same SHIELD, NAWCAD, and intelligence community task orders and shares Castellum's CMMC-oriented cyber posture.
- ICF International: Professional services and digital transformation firm serving federal civilian, defense, and intelligence clients with cyber, data analytics, and systems engineering capabilities. Comparable on federal civilian and Navy IT modernization work, though with a different mix than Castellum's defense-led portfolio.
- SAIC: Federal services integrator with significant Navy, missile defense, and intelligence community business in systems engineering, software development, and IT modernization. Competes for the same NAWCAD and MDA task orders Castellum targets, with overlapping cybersecurity and systems engineering offerings.
- Parsons Corporation: Federal solutions and critical infrastructure provider with substantial defense and intelligence work in cyber, electronic warfare, and systems engineering. Direct peer because of its Senior Cyber Portfolio heritage (Tim Gray previously worked there) and overlapping Navy, missile defense, and federal civilian contracts.
- Vencore (now part of GDIT / General Dynamics Information Technology): Large federal IT and systems integrator with deep intelligence community, Navy, and DoD cyber practices. Competes directly for IC and DoD cyber task orders and shares Castellum's emphasis on electronic warfare, information operations, and intelligence support work.
- Leidos: Top-tier federal services prime with major Navy, MDA, and intelligence community work in systems engineering, electronic warfare, and cybersecurity. Competes head-to-head for SHIELD, LIIS, and other large IDIQ task orders while providing overlapping cyber, EW, and systems engineering capabilities.
Emerging players
- ManTech (now part of KBR): Pre-acquisition ManTech was a closely comparable mid-size federal services peer focused on Navy, intelligence community, and DoD cyber and systems engineering—essentially the same scale, customer set, and technical capabilities as Castellum. Now operating as part of KBR, it remains a benchmark for the size and shape of the niche Castellum is targeting.
Market position
Strengths5 records
Weaknesses4 records
Competitive moat5 records
Key risks6 records
Key highlights6 records
Customer concentration
Castellum social profiles
Digital presenceCastellum compliance and trust
Trust signalCompliance1 record
Castellum financial estimates
Financial estimateRevenue estimate
Valuation estimate
Castellum leadership team
Management profileNumber of profiles
Profiles16 records
Castellum subsidiaries and ownership
Company hierarchySubsidiaries6 records
Castellum funding detail
Funding detailFunding overview
Funding rounds7 records
Investors1 record
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Castellum M&A and investment
M&A and investmentM&A3 records
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Castellum
What does Castellum do?
Castellum provides Cybersecurity, Software Development, Systems Engineering, Information/Electronic Warfare, Program Support, and Data Analytics services to U.S. federal government and commercial clients. The company delivers subject-matter expertise in artificial intelligence/machine learning, 5G technologies, model-based systems engineering, program management, information assurance, intelligence analysis, and CMMC compliance. Services are executed through wholly-owned subsidiaries (Corvus Consulting, Specialty Systems, Inc., and GTMR, Inc.) and joint ventures supporting national security missions.
Is Castellum a public or private company?
Castellum is a public company. It is classified as public and is currently operating.
When was Castellum founded?
Castellum was founded in 2019. It employs 51 to 100 people.
Where is Castellum based?
Castellum is headquartered in Bethesda, United States, in the North America region.
How does Castellum make money?
Two revenue lines are on record. Federal Government Contracts are the primary driver. The others are defense Technology Services.
Who are Castellum's main competitors?
Broad incumbents on record are CACI International, KBR (including ManTech legacy), Booz Allen Hamilton, Peraton, ICF International, SAIC, Parsons Corporation, Vencore (now part of GDIT / General Dynamics Information Technology) and Leidos. ManTech (now part of KBR) is listed as an emerging player.
Does Castellum have an API?
No public API is recorded for Castellum.
What industry is Castellum in?
Castellum's product category is Defense Technology Services. Its primary akta.pro industry code is BPAIAHAE, Cyber Defense & Information Security (National Security), with a secondary code of BPAEAMAG, Cybersecurity Operations Outsourcing (SOC / SecOps). Its NAICS code is 928110 and its SIC code is 8700.