Compare 36 Cybersecurity Maturity Model Certification (CMMC) partners delivering Level 1, Level 2, and Level 3 readiness programmes for US Department of Defense prime contractors and the subcontractor base. Listings cover Registered Practitioner Organisations (RPOs), C3PAO-affiliated assessment firms, Big Four federal practices running NIST 800-171 gap remediation, India-heritage SIs operating DIB security factories, and boutique specialists focused on Controlled Unclassified Information (CUI) enclave architectures. With the CMMC 2.0 rule effective and prime contracts now carrying flow-down clauses to subcontractors, the assessor and remediation partner market has tightened sharply. Scoping disputes around CUI boundary, Microsoft GCC versus GCC High, and enclave designs drive most cost overruns. No partner pays for placement on this directory.
CMMC engagements split into three sequenced workstreams. Scoping and gap assessment, where the partner maps CUI and FCI data flows, draws the assessment boundary, performs a NIST SP 800-171 self-assessment, and produces a Plan of Action and Milestones (POA&M). Remediation, where the partner closes the 110 NIST 800-171 controls (and the 24 Level 3 enhanced controls where applicable), stands up the CUI enclave (typically Microsoft 365 GCC High or a separate AWS GovCloud tenant), implements logging and incident response, and delivers the System Security Plan (SSP). Assessment readiness, where the partner runs a mock assessment, finalises evidence packages, and supports the contractor through the C3PAO certification visit.
Three procurement archetypes recur. C3PAO-affiliated assessment firms (Redspin, Coalfire, Schellman, A-LIGN, Kratos) lead on assessments themselves and on independent gap analysis; firms cannot legally remediate and assess the same client, so most run a separate readiness arm. Big Four federal practices (KPMG, Deloitte, PwC, EY) and federal SIs (Leidos, SAIC) lead on large prime contractors where CMMC sits inside a broader cyber and GRC programme. Boutique RPOs (Summit 7, CUICK TRAC, Core Business Solutions, Etactics, GuidePoint) lead the mid-market and subcontractor tier, where GCC High deployment expertise and manufacturing DIB context outweigh brand. Friction point: scoping disputes over what constitutes the CUI boundary routinely double the assessment cost, and GCC High licensing plus enclave operations frequently add $200k-$1.5M per year on top of remediation labour.
For complementary research see SIEM platforms, GRC platforms, endpoint protection, cloud security posture management, and identity governance. For adjacent services see FedRAMP advisory, SOC 2 implementation, ISO 27001 implementation, zero trust, identity security, and managed detection and response.
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