What Millennium Corporation does

Millennium Corporation is a federal cybersecurity services firm founded in 2004 and headquartered in Arlington, Virginia, that builds, staffs, and operates adversary emulation, red team, and defensive cyber programs primarily for the Department of Defense, Intelligence Community, and federal civilian agencies. Its core offerings span five integrated service lines — Cyber Operations, Enterprise Services, Software Engineering, Technical Engineering, and Cybersecurity Training — delivered through solutions including the ShadowView multi-source threat analytics platform, the Millennium Red Team and Black Ops advanced adversarial assessment capability, the Millennium Innovation Group, and the K>fivefour tiered cyber certification program. The firm supports 7 of 12 NSA-certified Red Teams and is the Department of Defense's largest contractor for Red Team operations. Underlying technology work is anchored in two secure facilities: the 10,000 sq.ft. Millennium Cyber Center and the Huntsville-based Millennium Threat Informatics Center (MTIC), which combines a Cyber Threat Operations Center, R&D labs with GPU clusters, and a dedicated training/event range.

The company monetizes through federal procurement channels, primarily as a prime contractor on a broad portfolio of IDIQ vehicles (ITES-3S, RS3, SeaPort NxG, GSA MAS/HACS/OASIS+, NASA SEWP, MDA SHIELD, TCOTS II) and through direct task order awards, supplemented by the MTS Advantage service-disabled veteran-owned joint venture with TIME Systems under the SBA mentor-protege program. Customers include DTRA, Air Combat Command, the FBI, PEO-STRI, Air National Guard, PMW-240 Sea Warrior, the U.S. Air Force, Army, Navy, NSA, and broader Intelligence Community buyers. The firm was founder-led by co-founders Cedric Henry and Kevin Jennings and grew to roughly 400 cleared cyber professionals before being acquired by Markon (a Sterling Investment Partners portfolio company) on February 20, 2026, positioning the combined entity as a Full Spectrum Cyber Provider across defense, intelligence, and federal civilian markets.

Name

Millennium Corporation

Legal name

Millennium Corporation

Website

https://millgroupinc.com

Company type

Private

Founded year

2004

Operating status

Acquired

Headcount range

251–500 employees

Short description

Millennium Corporation is a federal cybersecurity services firm delivering adversary emulation, red team operations, defensive cyber, software engineering, and cyber training to the DoD, Intelligence Community, and federal civilian agencies as the DoD's largest contracted Red Team operator.

Ownership category

akta.pro rank

Product category

Federal Cybersecurity Services

NAICS

Other Computer Related Services (541519), Computer Systems Design and Related Services (54151)

SIC

Services-Business Services, Nec (7389), Services-Computer Programming Services (7371)

akta.pro primary industry

Managed Detection & Response (MDR) & SOC Services (HDADAGAG)

akta.pro secondary industry

Security Operations Center (SOC) as a Service (BPAEADAB)

Keywords

• Cybersecurity services
• Red team operations
• Defensive cyber operations
• Federal government IT
• Cyber threat emulation

Headquarters

HQ city

Arlington

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure, Others

Revenue model

1. Federal Government Cybersecurity Services: Professional services revenue derived from providing cybersecurity services to federal government agencies including DoD, Intelligence Community, and civilian agencies. Revenue comes from IDIQ contracts, task orders, and direct contract awards for red team operations, threat emulation, test and evaluation, and training services.
2. Joint Venture - MTS Advantage: Joint venture with TIME Systems under SBA mentor-protege program, providing IT services in cybersecurity, systems engineering, and program management to government customers.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

Millennium Corporation provides cybersecurity professional services to U.S. federal government customers across five practice areas: Cyber Operations (red team, defensive cyber operations, threat emulation and threat intelligence), Enterprise Services (IT modernization, Zero Trust, cloud migration), Software Engineering (DevSecOps, application development, data science), Technical Engineering (systems engineering, test and evaluation, lifecycle management), and Cybersecurity Training (red/blue team and OPFOR training via the K>fivefour program). It supplements these services with the ShadowView proprietary analytics platform, the Millennium Threat Informatics Center (MTIC) training and operations facility, and the MTS Advantage joint venture for Navy and federal civilian work.

Product overview

Millennium Corporation is a cybersecurity services company offering a comprehensive portfolio of integrated cyber solutions. The core offerings include Cyber Operations (red team/defensive operations), Enterprise Services (IT modernization, cloud, Zero Trust), Software Engineering (DevSecOps, data science), Technical Engineering (systems engineering, test/evaluation), and Cybersecurity Training. These are supported by specialized solutions including ShadowView (threat analytics), Millennium Red Team (NSA-certified red teams), Millennium Innovation Group (emerging threat solutions), and the Millennium Cyber Center (10,000 sq.ft. training facility). The company also operates K>fivefour cybersecurity training certification program and MTS Advantage joint venture with TIME Systems. Following the February 2026 acquisition by Markon, the combined entity positions as a Full Spectrum Cyber Provider serving defense, intelligence, and federal civilian agencies.

Differentiator

Problem solved

Functional benefit

Brands

• K>fivefour: Elite cybersecurity training and certification offering with hands-on, scenario-driven training through five progressive certification levels aligned to real-world Red Team, Blue Team, and integrated mission roles.
• ShadowView
• Millennium Red Team
• Millennium Innovation Group
• Millennium Cyber Center
• MTIC (Millennium Threat Informatics Center)

Products and services

• Cyber Operations Adversarial threat emulation services including Red Team Services, Defensive Cyber Operations, Threat Intelligence, Supply Chain Risk Management, and Cyber Operations Support for federal government agencies.
• Enterprise Services IT modernization, Zero Trust architecture, Cloud Migration, System Architecture, Governance Risk and Compliance, Risk Management, and Network Modernization services for federal clients.
• Software Engineering DevSecOps, Software Assurance, Application Development, Knowledge Management, and Data Science services delivered in secure environments for government and federal clients.
• Technical Engineering Systems Engineering, Test and Evaluation, Lifecycle Management, and Program and Project Management services.
• Cybersecurity Training Red Team Training, OPFOR (Opposing Force), Training Development, and Training Management services delivered in partnership with K>fivefour.
• ShadowView Advanced threat analytics platform that fuses data from public, private, and classified sources to identify and secure high-value targets, supporting supply chain management, threat hunting, continuous monitoring, cyber targeting, and attack surface enrichment.
• Millennium Red Team NSA-certified red team operations supporting the bulk of NSA-certified red teams across DoD networks, including an elite Black Ops team for advanced adversarial assessments and tool development.
• Millennium Innovation Group Internal innovation cell that develops solutions to emerging cyber challenges, including proprietary training programs and intelligence platforms.
• Millennium Cyber Center 10,000 sq.ft. secure facility housing the Cyber Threat Operations Center and Cyber Training Center, hosting hands-on cybersecurity training programs.
• K>fivefour Elite cybersecurity training and certification program with five progressive certification levels aligned to real-world Red Team, Blue Team, and integrated mission roles, delivered as part of the Markon-Millennium portfolio following acquisition.
• MTS Advantage Joint venture between Millennium Corporation and TIME Systems providing IT services in cybersecurity, systems engineering, and program management under a service-disabled veteran-owned small business designation.

Quantifiable outcome

• Supporting 7 of 12 NSA-certified Red Teams in the DoD
• +2 more outcomes

Named customers12 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Four partnerships are on record, tiered core.

• MarkoncoreStrategic or Co-development Partner · 20 February 2026Markon acquired Millennium Corporation on February 20, 2026, establishing the combined organization as a leading Full Spectrum Cyber Provider. The acquisition unites Markon's enterprise service delivery strengths and Intelligence Community support expertise with Millennium's deep ties to defense market and elite cyber operations, engineering, analysis, testing, training, and software capabilities. Independent Research and Development programs consolidated under Markon brand.
• MAXISIQcoreStrategic or Co-development Partner · 3 May 2023Millennium acquired MAXISIQ's INGRESSIVE Business division in May 2023, expanding cyber portfolio with security vulnerability assessments, penetration testing, and red teaming capabilities. The acquisition opened new doors into Department of Homeland Security and other federal and commercial organizations.
• k>fivefourcoreStrategic or Co-development PartnerTraining partner providing superior hands-on cyber operations training. K>fivefour empowers cybersecurity professionals through hands-on training. The partnership enables Millennium to provide specialized red and blue team training, cyber range development, and Opposing Force (OPFOR) training services. The K>fivefour certification program was integrated into Markon portfolio following acquisition.
• TIME SystemscoreStrategic or Co-development PartnerJoint venture partner under SBA mentor-protege program. Millennium and TIME Systems formed MTS Advantage joint venture (service-disabled veteran-owned) headquartered in Dumfries, VA. The JV provides IT services in cybersecurity, systems engineering, and program management areas, including the $99.9M Navy IDIQ for red team system vulnerability testing.

Scale indicators6 records

Recent moves7 records

Expansion highlights6 records

Broad incumbents

• Booz Allen Hamilton: Large federal consulting prime with a substantial defense and intelligence cybersecurity practice, including red team, threat hunting, and Zero Trust services. Competes with Millennium on shared IDIQs (OASIS+, SeaPort NxG) for DoD and IC cyber work, but at vastly greater scale.
• CACI International: Federal IT and national security services prime with significant DoD cyber, electronic warfare, and intelligence portfolios; acquired ManTech in 2022 to deepen cyber and defense capabilities. Competes with Millennium on Navy, Army, and intelligence community cyber task orders.
• ManTech International (now part of CACI): Federal services prime historically focused on DoD and Intelligence Community cyber, intelligence, and systems engineering. Direct competitor on Navy and IC cyber work; now operates within CACI but retains a comparable cyber services profile to Millennium.
• Leidos: Large federal IT and national security prime with a major cyber operations, Defensive Cyber Operations, and Zero Trust practice supporting DoD, IC, and federal civilian. Overlaps with Millennium on shared IDIQs and competes for large task orders in red team and DCO services.
• SAIC: Federal IT and engineering services prime with a sizable defense and intelligence cyber portfolio including red team, vulnerability assessment, and cyber training. Competes with Millennium on Navy SeaPort NxG and Army RS3 task orders.
• Parsons Corporation: Federal services and critical infrastructure cybersecurity provider with significant DoD and intelligence community work in cyber, electronic warfare, and test & evaluation. Competes with Millennium on T&E and cyber operations contracts.
• KEYW Corporation (now Jacobs): Legacy cleared federal cyber and intelligence services firm, now part of Jacobs following its 2019 acquisition by Hexagon. Historically competed with Millennium in IC and DoD cyber, particularly around cyber operations and geospatial-intelligence support.
• Amentum: Federal services and engineering prime formed from AECOM's management services business with significant DoD and intelligence IT and cyber portfolios. Competes with Millennium on Army, Navy, and intelligence community cyber task orders.

Direct peers

• Novetta (Accenture Federal): Specialty federal cyber and advanced analytics firm focused on IC and DoD customers, with similar tradecraft in threat emulation, data fusion, and cleared cyber operations. Highly comparable specialty positioning to Millennium, now operating within Accenture Federal.

Emerging players

• Battelle Memorial Institute: Nonprofit R&D organization operating cyber ranges, cyber training, and national security cyber services for DoD and intelligence customers. Overlaps with Millennium on cyber training, range development, and OPFOR support but is nonprofit-structured.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/MillenniumCorp
• LinkedInlinkedin.com/company/millennium-corporation

Revenue estimate

Valuation estimate

Number of profiles

Profiles16 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Millennium Corporation