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CMMC C3PAOs

Certified Third-Party Assessment Organizations (C3PAOs) listed in the Cyber AB CMMC Marketplace, which assess defense contractors for CMMC certification.

117 firms listed · October 2026 snapshot

FedRAMP 3PAOGovRAMP 3PAOPCI QSACMMC C3PAOHITRUST assessorISO 27001 CBSOC 2 services sourced

Aprio, LLP.

Atlanta, GA

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FedRAMP 3PAOGovRAMP 3PAOPCI QSAPCI ASVCMMC C3PAOHITRUST assessorSOC 2 services sourced

ControlCase

Fairfax, VA

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FedRAMP 3PAOGovRAMP 3PAOPCI QSAPCI ASVCMMC C3PAOHITRUST assessorSOC 2 services sourced

RSM US, LLP

Chicago, IL

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FedRAMP 3PAOPCI QSACMMC C3PAOHITRUST assessorSOC 2 services sourced

Tevora

Irvine, CA

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Frequently asked questions

How is this list sourced?

Cyber AB CMMC Marketplace is the official list, read October 3, 2026. A C3PAO conducts CMMC certification assessments for defense contractors. Check the Cyber AB Marketplace for each firm's current authorization status. Check the live registry for changes.

Are these listings endorsements?

No. Compare the firm's services and confirm current status before engaging an auditor.

Firms are listed from official registries, each with its own as-of date. Locations are shown only where the registry or the firm's own site provides them. A listing records registry status, not an endorsement, and directory information may change. SOC 2 is a CPA attestation report, not a certificate. pa.tax is independent: listed firms pay nothing for inclusion, ranking or referrals, and firms are listed alphabetically.

Confirm current status and scope directly with the Cyber AB CMMC Marketplace, as of October 3, 2026.