Best FedRAMP 3PAOs: 10 Assessment Firms Compared
FedRAMP assessments must be performed by an A2LA-accredited Third Party Assessment Organization (3PAO). The 10 firms below have FedRAMP work on record in our directory — always confirm current 3PAO accreditation on the FedRAMP Marketplace before engaging.
Top 10 FedRAMP audit firms, ranked
Select up to three firms below to compare them side by side.
1. A-LIGN
Unverified · public records- – Price band: not yet verified
- – Typical timeline: not yet verified
- ✓ GRC integrations on record: Drata, Secureframe, Vanta
- ✓ CPA firm (attestation-capable)
- – No verified client reviews yet
2. Schellman
Unverified · public records- – Price band: not yet verified
- – Typical timeline: not yet verified
- ✓ GRC integrations on record: Drata, Secureframe, Vanta
- ✓ CPA firm (attestation-capable)
- – No verified client reviews yet
3. Coalfire
Unverified · public records- – Price band: not yet verified
- – Typical timeline: not yet verified
- – GRC integrations: not yet verified
- ✓ CPA firm (attestation-capable)
- – No verified client reviews yet
4. Deloitte
Unverified · public records- – Price band: not yet verified
- – Typical timeline: not yet verified
- – GRC integrations: not yet verified
- ✓ CPA firm (attestation-capable)
- – No verified client reviews yet
5. Ernst & Young (EY)
Unverified · public records- – Price band: not yet verified
- – Typical timeline: not yet verified
- – GRC integrations: not yet verified
- ✓ CPA firm (attestation-capable)
- – No verified client reviews yet
6. KPMG
Unverified · public records- – Price band: not yet verified
- – Typical timeline: not yet verified
- – GRC integrations: not yet verified
- ✓ CPA firm (attestation-capable)
- – No verified client reviews yet
7. Linford & Company
Unverified · public records- – Price band: not yet verified
- – Typical timeline: not yet verified
- – GRC integrations: not yet verified
- ✓ CPA firm (attestation-capable)
- – No verified client reviews yet
8. PwC
Unverified · public records- – Price band: not yet verified
- – Typical timeline: not yet verified
- – GRC integrations: not yet verified
- ✓ CPA firm (attestation-capable)
- – No verified client reviews yet
9. Fortreum
Unverified · public records- – Price band: not yet verified
- – Typical timeline: not yet verified
- – GRC integrations: not yet verified
- – No verified client reviews yet
10. Kratos Defense
Unverified · public records- – Price band: not yet verified
- – Typical timeline: not yet verified
- – GRC integrations: not yet verified
- – No verified client reviews yet
Compare at a glance
| # | Firm | Price band | Timeline | GRC platforms | Verified reviews | Status |
|---|---|---|---|---|---|---|
| 1 | A-LIGN | Not yet verified | Not yet verified | Drata, Secureframe, Vanta | No verified reviews yet | Unverified |
| 2 | Schellman | Not yet verified | Not yet verified | Drata, Secureframe, Vanta | No verified reviews yet | Unverified |
| 3 | Coalfire | Not yet verified | Not yet verified | Not yet verified | No verified reviews yet | Unverified |
| 4 | Deloitte | Not yet verified | Not yet verified | Not yet verified | No verified reviews yet | Unverified |
| 5 | Ernst & Young (EY) | Not yet verified | Not yet verified | Not yet verified | No verified reviews yet | Unverified |
| 6 | KPMG | Not yet verified | Not yet verified | Not yet verified | No verified reviews yet | Unverified |
| 7 | Linford & Company | Not yet verified | Not yet verified | Not yet verified | No verified reviews yet | Unverified |
| 8 | PwC | Not yet verified | Not yet verified | Not yet verified | No verified reviews yet | Unverified |
| 9 | Fortreum | Not yet verified | Not yet verified | Not yet verified | No verified reviews yet | Unverified |
| 10 | Kratos Defense | Not yet verified | Not yet verified | Not yet verified | No verified reviews yet | Unverified |
What to check before hiring a 3PAO
Current A2LA accreditation
Only accredited 3PAOs can perform FedRAMP assessments. Check the official FedRAMP Marketplace listing, not just the firm's website.
Agency vs. JAB path experience
Ask how many authorizations the firm has supported on your intended path and at your impact level (Low/Moderate/High).
Advisory separation
A 3PAO cannot assess a system it helped build. If you need readiness help, plan for separate firms or clearly separated teams.
Continuous monitoring
Annual assessments and significant-change reviews are recurring — pick a firm you can work with for years, not one engagement.
Frequently asked questions
What is a FedRAMP 3PAO?
A Third Party Assessment Organization accredited by A2LA to independently assess cloud services against FedRAMP requirements. Federal agencies rely on 3PAO assessments when granting an Authority to Operate (ATO).
Can my SOC 2 auditor do my FedRAMP assessment?
Only if the firm is also an accredited 3PAO. The overlap in evidence helps, but FedRAMP assessment authority comes from A2LA accreditation, not CPA licensure.
How were these FedRAMP firms ranked?
By verification status, then profile completeness, then verified client reviews. Accreditation status should always be confirmed on the official FedRAMP Marketplace — our methodology page explains what we verify ourselves.
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