Cyber Audit Listings

The listings published on this site catalog cyber audit service providers, independent auditors, and credentialed firms operating across the United States. Each entry is organized by service type, applicable regulatory framework, and geographic reach, enabling researchers, procurement officers, and compliance professionals to locate and evaluate providers within a structured reference system. The directory draws classification boundaries from established frameworks including NIST SP 800-53, ISO/IEC 27001, and sector-specific audit mandates under FedRAMP, HIPAA, and PCI DSS. For context on how this directory fits within the broader reference structure, see the Cyber Audit Directory Purpose and Scope page.

How listings are organized

Listings are grouped into 4 primary service categories, each reflecting a distinct functional role within the cyber audit sector:

1. Technical Security Auditors — providers conducting penetration testing, vulnerability assessments, and architecture reviews against defined control baselines such as NIST SP 800-53 Rev 5 or CIS Controls v8.
2. Compliance Auditors — firms performing formal assessments against regulatory mandates, including HIPAA Security Rule audits (45 CFR Part 164), SOC 2 Type II engagements under AICPA standards, and FedRAMP Third Party Assessment Organization (3PAO) reviews.
3. Financial-Sector Cyber Auditors — practitioners operating under FFIEC IT Examination Handbook guidance or SEC cybersecurity disclosure rules, including those assessing controls at broker-dealers and registered investment advisers.
4. Internal Audit Support Specialists — consultants augmenting in-house audit functions, typically aligned to IIA (Institute of Internal Auditors) Global Technology Audit Guide (GTAG) standards.

Within each category, entries are sorted by certification credential, then by state of primary operation. Firms holding active FedRAMP 3PAO authorization from the General Services Administration are flagged separately, as that status represents a government-validated qualification tier distinct from self-attested credentials.

What each listing covers

A standard listing entry contains structured data across 6 fields:

1. Provider name and legal entity type — distinguishes sole practitioners, LLCs, and incorporated firms, relevant for procurement contracting requirements.
2. Primary service type — mapped to the 4 categories above; a provider may appear in more than one category if credentialed for both compliance and technical audit work.
3. Applicable frameworks and standards — lists the specific frameworks the provider is credentialed or experienced against, such as NIST CSF 2.0, ISO/IEC 27001:2022, PCI DSS v4.0, or CMMC (Cybersecurity Maturity Model Certification) Level 2 or 3 assessments.
4. Active credentials and certifications — includes CISSP, CISA (Certified Information Systems Auditor, issued by ISACA), QSA (Qualified Security Assessor, authorized by the PCI Security Standards Council), and C3PAO status under the CMMC ecosystem managed by the Cyber AB.
5. Geographic service area — primary state of registration and any secondary states where the provider maintains active engagements or licensed personnel.
6. Regulatory scope notes — identifies sector-specific limitations or specializations, such as a firm restricted to healthcare covered entities under HIPAA or one exclusively serving Department of Defense contractors under DFARS 252.204-7012.

For guidance on interpreting these fields in context, the How to Use This Cyber Audit Resource page provides a structured walkthrough of entry notation and field definitions.

Geographic distribution

The directory covers providers across all 50 states, with the heaviest concentration in 5 metropolitan clusters: the Washington D.C. metro area (reflecting proximity to federal contracting), Northern California (cloud infrastructure and FedRAMP work), New York City (financial-sector compliance), Texas (energy sector OT/ICS audit), and Illinois (healthcare and insurance compliance). These 5 clusters account for an estimated majority of credentialed 3PAO and QSA-authorized firms in the United States, consistent with the distribution of regulated industry headquarters.

State-level variation in licensing requirements adds a secondary organizational layer. Texas, for example, requires cyber audit practitioners performing certain assessments under Texas Administrative Code Title 1, Part 10 to meet state-defined qualifications distinct from federal credentialing. New York's Department of Financial Services Part 500 (23 NYCRR 500) imposes specific independent audit obligations on covered entities, creating demand for auditors credentialed against that regulation specifically.

Listings are not exhaustive for every state. Entries are included when providers have submitted verifiable credential documentation or when their authorization status is publicly verifiable through a named regulatory body such as the PCI SSC's Qualified Security Assessor list or the GSA FedRAMP Marketplace.

How to read an entry

Each listing entry follows a consistent format. The provider name appears at the top, followed by a credential badge row indicating active certifications. Below that, a framework alignment block lists the audit standards the provider covers, using the official publication identifiers — for example, "NIST SP 800-171 Rev 2" rather than an informal shorthand.

The distinction between a compliance audit and a technical audit entry is material and explicitly marked. A compliance audit entry indicates the provider produces formal audit reports suitable for submission to a regulator, assessor body, or contracting officer. A technical audit entry indicates the provider delivers findings reports, not formal compliance attestations — a critical distinction under frameworks like FedRAMP, where only GSA-authorized 3PAOs may produce assessments accepted for an Authority to Operate (ATO).

Credential expiration status is noted where publicly available. ISACA's CISA credential requires 20 continuing professional education (CPE) hours annually and 120 CPE hours per 3-year renewal cycle, per ISACA's published maintenance requirements. Entries flagged with a lapsed or unverified credential status are retained in the directory with a notation rather than removed, preserving the reference record while signaling verification gaps to the reader.

All entries in the Cyber Audit Listings are cross-referenced against the framework categories described above to maintain consistent classification across the full directory.