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Auditors & Assessors

Verified CMMC Third-Party Assessors

TrustPartners.directory lists 36 verified firms in CMMC Assessors (C3PAOs). Each profile shows an independent verification tier (0–3), attestation context where available, and headquarters location so buyers can shortlist with evidence—not ads. Rankings reflect verification depth, recency, and profile completeness; they are never pay-to-rank. Use the filters to narrow by compliance framework, U.S. state, or tier, then open a profile to compare credentials side by side.

Directory

Verified listings

Filter by framework, U.S. state, or tier. The canonical URL for this category stays unfiltered for search engines.

Listings are sorted with Tier 3 first so you see the strongest verification signal at the top—never pay-to-rank.

500+

GRC partners listed

300+

independently verified (Tier 2+)

0

listings influenced by payment

Quantified proof

Our promise

We Stake Our Reputation on Every Verification

TrustPartners isn't a directory that lists whoever pays. We independently verify every compliance claim at Tier 2 and above. And we stand behind that verification.

If any Tier 2+ listing on TrustPartners is found to contain inaccurate compliance information, report it. We'll investigate within 48 hours, correct the listing, and personally verify three alternative providers for you — at no cost.

We can make this promise because our verification process works. But more importantly, we make it because trust isn't just our product — it's our obligation.

Read Our Verification Methodology →

How to evaluate

What to look for when choosing CMMC Assessors (C3PAOs)

Independently verified CMMC Assessors (C3PAOs) on TrustPartners.directory. Evidence tiers show what we checked—rankings are never pay-for-rank.

Prioritize firms that map clearly to your frameworks and regulatory context, show recent attestation or monitoring where applicable, and document who does the work (named assessors or auditors when relevant). Use TrustPartners.directory tiers as a starting signal, then validate scope, sample reports or work products, and references in your own process.

Verification

How TrustPartners verifies this category

We do not store confidential audit reports—only metadata that helps buyers compare firms consistently.

Listings in this category are reviewed for identity, service fit, published evidence, and alignment with the category taxonomy on TrustPartners.directory. Higher tiers reflect deeper evidence checks and, where applicable, ongoing monitoring—not payment.

Read how we verify for the full tier definitions and editorial rules.

Related

More in Auditors & Assessors

Adjacent categories use the same verification rules and tier scale on TrustPartners.directory.

For GRC providers

Get in front of buyers who verify before they buy

Qualified CISOs, GRC leads, and procurement teams use TrustPartners.directory to shortlist partners with transparent tiers—not pay-to-rank placement. Claim your profile, earn your tier, and turn attestations into discoverable proof.

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FAQ

Common questions about CMMC Assessors (C3PAOs)

Straight answers for buyers and providers. Structured data helps search and AI systems cite TrustPartners.directory accurately.

What does verification mean for CMMC Assessors (C3PAOs) on TrustPartners.directory?
Verification is an independent tier (0–3) based on public evidence, document checks, and ongoing monitoring where applicable. Tiers describe how much evidence TrustPartners has reviewed—not a substitute for your own procurement or legal diligence.
How many verified CMMC Assessors (C3PAOs) partners are listed?
There are currently 36 published listings in this category on TrustPartners.directory. Counts change as new firms are published and verified.
How should I use the framework and state filters?
Choose a framework (for example SOC 2 or ISO 27001) or a U.S. state to match your program requirements or location preferences. The canonical page URL stays unfiltered for search engines; filters help you narrow the shortlist.
Does TrustPartners.directory rank firms by payment?
No. Ordering and visibility rules are documented publicly: verification depth, recency, and profile completeness drive ranking—not sponsorship.
How do I get my firm listed or upgrade verification?
Start with Get Verified on TrustPartners.directory to claim or submit a profile. Internal reviewers map your category, frameworks, and evidence to the published tier.

Next steps on TrustPartners.directory

Providers can claim a profile and pursue verification. Buyers can compare shortlists using consistent tier and framework metadata across categories.

Get verified

List your firm with transparent evidence tiers. Start free and upgrade when you are ready to maintain verified status.

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Open the full directory to filter by framework, state, and tier, or jump to another category to build a shortlist with consistent verification metadata.

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