Top CMMC Registered Provider Organizations (RPOs) In 2027
Dominic Tarn
Head Writer - ReVerb
11.14.2026
Last updated: November 14, 2026
The top CMMC Registered Provider Organizations in 2027 are Summit 7 for Microsoft GCC High environments, CyberSheath for managed compliance, MBL Technologies for veteran-owned advisory near the Pentagon, Petronella Technology Group for small manufacturers, and Crowell & Moring when legal risk and compliance overlap.
A Registered Provider Organization (RPO) is a firm registered with The Cyber AB, the official CMMC accreditation body, and staffed with Registered Practitioners. RPOs help defense contractors scope their Controlled Unclassified Information (CUI) environment, close gaps against NIST SP 800-171, write the System Security Plan and get ready for a certified third-party assessment. Industry trackers counted roughly 390 RPOs on The Cyber AB Marketplace in 2026.
An RPO works on your side of the table. It cannot also assess you; that is the job of a separate C3PAO. Always confirm a firm’s current listing on The Cyber AB Marketplace before signing. For the requirements themselves, read our CMMC Level 2 requirements guide and CMMC certification cost breakdown.
CMMC RPOs At A Glance
Firm
Headquarters
Best For
Also Offers
Summit 7
Huntsville, AL
Microsoft 365 GCC High and Azure Government
Managed services, licensing
CyberSheath
Reston, VA
Managed CMMC compliance programs
Managed security services
MBL Technologies
Arlington, VA
Veteran-owned CMMC advisory
Cyber and enterprise risk work
Petronella Technology Group
Raleigh, NC
Small and mid-sized manufacturers
Managed IT and security
E-N Computers
Waynesboro, VA and Washington, DC
Small contractors needing IT plus compliance
Co-managed IT
38North Security
Washington, DC
DC-based CMMC consulting
Security program advisory
Industrial Security Integrators (ISI)
Virginia
Physical and cyber security together
Facility clearance support
Crowell & Moring
Washington, DC
Legal and compliance risk in one firm
Government contracts law
Systems Planning and Analysis (SPA)
Alexandria, VA
Supply chain programs for large primes
Defense analysis and engineering
Pellera Technologies
United States
Enterprise IT buyers adding CMMC
IT solutions and services
The Best CMMC RPOs In 2027
1. Summit 7 — GCC High And Microsoft Cloud Specialists For The Defense Industrial Base
Summit 7, founded in 2008 in Huntsville, Alabama, is best known for migrating defense contractors into Microsoft 365 GCC High and Azure Government and then supporting CMMC readiness on that stack.
If your CUI lives in Microsoft 365, Summit 7 is one of the most experienced options available.
2. CyberSheath — Managed Compliance That Keeps Controls Running After Certification
Reston-based CyberSheath packages CMMC readiness with managed security services, so controls such as logging, vulnerability management and incident response keep operating after the assessment.
It suits contractors that lack internal security staff and want one provider accountable for ongoing compliance.
3. MBL Technologies — Veteran-Owned Advisory Close To The Pentagon
MBL Technologies, a veteran-owned firm in Arlington, Virginia, provides CMMC readiness, NIST 800-171 gap assessments and broader cybersecurity and risk consulting to defense and federal clients.
It is a strong fit for contractors who value advisors with direct experience of DoD programs.
Petronella, founded in 2002 in Raleigh, North Carolina, is listed as RPO #1449 and staffs its delivery team with CMMC Registered Practitioners. It supports Levels 1 through 3 from gap assessment through C3PAO handoff.
Small machine shops and suppliers outside the DC region will find its managed IT plus compliance model practical.
5. E-N Computers — IT Support And CMMC Readiness For Small Contractors
E-N Computers, with offices in Waynesboro, Virginia and Washington, DC, is an RPO that combines co-managed IT support with CMMC preparation for small businesses.
It fits companies whose CMMC gap is really an IT gap: missing MFA, logging or asset inventories.
6. 38North Security — CMMC Consulting From Inside Washington, DC
38North Security is a Washington, DC-based RPO that helps organizations build security programs and prepare for CMMC assessments.
Pick it if you want a smaller consultancy with senior attention and a DC presence.
ISI supports defense contractors with both CMMC readiness and industrial security needs, which helps cleared contractors who manage facility clearances and CUI together.
It is useful when physical access, visitor control and cyber controls all need to line up for an assessment.
Crowell & Moring became the first AmLaw 100 law firm to achieve RPO status in 2021, combining CMMC advice with government contracts, False Claims Act and cybersecurity law.
Choose it when compliance decisions carry legal exposure, such as self-attestations in SPRS or contract disputes.
Pellera Technologies was listed on The Cyber AB Marketplace as an RPO in May 2026, adding CMMC readiness to its enterprise IT solutions business.
It fits organizations that already buy infrastructure and services from Pellera and want CMMC support from the same partner.
How We Evaluated These RPOs
Every firm here appears as an RPO in public sources. We then weighed:
Depth in NIST SP 800-171 and DFARS work, including history before CMMC
Ability to remediate, not only assess, through managed IT or security services
Specialization, such as GCC High, manufacturing or legal risk
Clarity about the line between RPO advice and C3PAO assessment
How To Choose A CMMC RPO
Is the firm currently listed on The Cyber AB Marketplace?
Search the marketplace by name and confirm an active RPO listing and Registered Practitioners on staff.
Can they fix gaps or only find them?
Many contractors need hands-on remediation. Ask whether the RPO or a partner MSP will implement controls.
Do they know your technology stack?
Microsoft GCC High, Google Workspace, on-premise file servers and manufacturing networks each need different expertise.
How will they hand you off to a C3PAO?
A good RPO prepares evidence and a mock assessment so the formal assessment has no surprises. See our CMMC compliance software list for tools that track evidence.
Frequently Asked Questions
What is a CMMC RPO?
A Registered Provider Organization is a firm registered with The Cyber AB that provides CMMC readiness advice and consulting through Registered Practitioners. It does not perform certification assessments.
What is the difference between an RPO and a C3PAO?
An RPO helps you prepare. A C3PAO, or Certified Third-Party Assessor Organization, performs the official CMMC Level 2 assessment. The same team cannot both prepare and assess you.
How many RPOs are there?
Industry trackers counted roughly 390 RPOs on The Cyber AB Marketplace in 2026. Check the marketplace for the current list.
Do I need an RPO to pass CMMC?
No, it is not required, but most small and mid-sized contractors use one because Level 2 has 110 requirements and detailed documentation expectations.
Conclusion
A good RPO shortens the path to CMMC Level 2 and reduces the risk of a failed assessment. Choose Summit 7 for Microsoft cloud environments, CyberSheath or E-N Computers for managed compliance, MBL Technologies or 38North Security for DC-area advisory, Petronella for small manufacturers, and Crowell & Moring when the legal side matters.
