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SOC 2 Readiness FirmsPenetration Testing FirmsvCISO FirmsISO 27001 ConsultantsCompliance ConsultantsAll Service FirmsCPA firms that understand model versioning as change management, training data access as evidence, subprocessor boundaries for LLM providers, and when ISO 42001 belongs beside SOC 2.
Updated / Different vertical? SaaS · Healthcare · FinTech · Startups
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Six AI picks for SOC 2 plus ISO 42001, established AI practices, Vanta-native AI, Drata-native specialists, Bay Area AI, and enterprise multi-framework scope.
Thoropass is the pick for an AI startup that wants SOC 2 and ISO 42001 under one CPA engagement. Owns the GRC platform, audits both frameworks, and fixed-fee pricing aimed at under-200-employee AI companies.
Schellman is the pick when buyer scrutiny is high and your AI controls need a brand-name CPA on the cover. Published methodology for AI in SOC 2, Top 50 CPA, with depth in cloud and ML platforms.
Prescient Security is the pick for Series A and growth-stage AI companies on Vanta that want SOC 2 and ISO 42001 in a single engagement. Deep Vanta partner, AI-first portfolio, Slack-based audit communication.
Consilium Labs is the pick for Drata-native AI companies that want a specialist firm explicitly listing AI Companies and ISO 42001 in scope. Structured, evidence-based engagements with multi-framework coverage and fixed-fee pricing.
Sensiba LLP is the pick for VC-backed Bay Area AI companies bundling SOC 2 with ISO 42001 and ISO 27001. B Corp credibility, ISO 42001 for AI governance, and a Bay Area presence that matters for on-site readiness work.
A-LIGN is the pick for enterprise AI vendors selling into regulated industries that need SOC 2 alongside HITRUST, FedRAMP, or ISO. One of the highest-volume US SOC 2 practices runs the framework stack under one engagement.
Sorted by editorial rank based on AI, ML, LLM, ISO 42001, and related evidence in the directory data. Profile pages show pricing, timelines, and framework coverage.
Type 1 and Type 2 figures reflect a mix of firm-confirmed numbers, public sources, and our own estimates, refreshed periodically. Actual cost depends on company size, scope, and Trust Service Criteria.
Best for · First-time SOC 2 / ISO 27001 / HIPAA / PCI / HITRUST seekers (under 200 employees) who want one vendor handling both the GRC platform and the audit, eliminating the handoff between Vanta/Drata-style automation and a separate CPA firm. Companies pursuing multiple frameworks who want shared evidence across SOC 2 + ISO 27001 + HITRUST + PCI in a single audit cycle. Mid-market SaaS, fintech, and healthtech seeking 25-50% savings vs. traditional audit firms with fixed pricing.
Differentiator · Bundles a proprietary GRC platform with an in-house CPA firm, PCI QSAC and ASV, and HITRUST Authorized External Assessor under one roof. Same auditor from Day 1 through report issuance, no handoff between readiness vendor and audit firm. First Pass and Smart Sort AI pre-screen evidence before audit, cutting manual overhead up to 80% and completing audits up to 62% faster. 30+ frameworks on a single shared evidence set, plus a standalone audit module that works alongside Vanta, Drata, Secureframe, Hyperproof, Archer, and OneTrust. Active healthcare practice (Array Behavioral Care, Alaffia Health, HealthSnap) covering HITRUST + SOC 2 coordinated audits in PHI-sensitive environments.
Best for · Mid-market to enterprise companies that need multiple compliance frameworks (SOC 2 + ISO 27001 + HITRUST + FedRAMP + PCI) under one roof. CSPs pursuing FedRAMP authorization. Companies that want a top-three FedRAMP 3PAO and #1 SOC 2 issuer on the cover of the report.
Differentiator · #1 issuer of SOC 2 reports in the world with 5,700+ clients and 31,000+ audits completed. Top-three FedRAMP 3PAO; CMMC C3PAO authorized. A-SCEND platform was the first audit-management platform from a top-3 3PAO to achieve FedRAMP 20x Low authorization (Sept 2025), now augmented with EvidenceIQ AI evidence scoring and Cross-Service framework reuse. Acquired by Hg in July 2025 at a $1B+ valuation, accelerating European expansion and AI investment. CEO Scott Price (founder, 2009); Steve Simmons elevated to President in January 2026.
Best for · SaaS, FinTech, HealthTech, e-commerce, regulated industries, enterprises to fast-growing startups
Differentiator · CPA-led firm with AICPA standards, end-to-end support from readiness to attestation, global presence with local regulatory expertise, automation-driven compliance execution
Best for · Mid-market tech companies ($10M-$500M revenue) prioritizing speed and technology integration. Private equity-backed companies needing bundled audit, tax, and compliance services. Bay Area & West Coast startups wanting local presence and tech industry fluency. Companies expanding internationally requiring both SOC 2 and ISO 27001/27701. Organizations valuing efficiency over brand prestige alone
Differentiator · Top 20 U.S. accounting firm with 2,000+ employees and 50+ years experience (founded 1969). Audit Ally AI-powered platform (launched Jan 2024) - purpose-built by accountants for auditors with centralized dashboard, AI-powered automation, embedded communication, and AI summarization of audit notes. ANAB-accredited ISO certification body (can issue ISO certificates, not just attest - extremely rare among CPA firms). Integrated audit + tax + consulting + ISO certification under one roof eliminates vendor management overhead. Strong Bay Area presence with deep Silicon Valley expertise and VC relationships
Best for · Companies that want a long-term audit relationship over a transactional, checkbox engagement — and need a firm that can start immediately and cover SOC 2 alongside ISO 27001, ISO 42001, NIST, or HITRUST without bringing in a second vendor.
Differentiator · Independent, employee-owned CPA firm headquartered in Cincinnati (founded 1965, 225 staff) with roughly 20 people working exclusively on SOC reports. Readiness, audit, and issuance are handled entirely in-house with no outsourcing, by a team distributed across six time zones that serves two-person startups through large multinationals. SOC engagements are priced as a fixed fee rather than billed hourly, so the number is known before fieldwork begins, and the firm holds strong AICPA Peer Review standing. Multi-framework coverage (SOC 2, ISO 27001, ISO 42001, NIST, HITRUST, AI systems compliance) consolidates parallel attestations into one report, with a quality-and-relationship orientation rather than checkbox auditing. Notably fast: able to start engagements immediately, where most peers have multi-month lead times.
Best for · Cloud-native SaaS, IaaS, and PaaS companies (high-growth startups through Fortune 1000 enterprises) needing multi-framework attestation (SOC 2 + ISO 27001 + HITRUST + PCI DSS + CMMC) in a single coordinated engagement. Healthcare technology pursuing HITRUST. Y Combinator-style SaaS startups already running on automation tools like Vanta or Drata. Companies that want boutique-feel partner attention with global-consulting-firm methodology.
Differentiator · One of a handful of US firms eligible to audit against the five highest-regarded frameworks under one roof: ISO 27001, SOC 2, HITRUST, PCI DSS, and CMMC. Branded 'Coordinated Audit' approach maps evidence once across multiple frameworks. 'No surprises' promise published on the readiness-assessment page: clear scoping, no last-minute findings. Cloud-native methodology built specifically for AWS/Azure/GCP. Big 4 alumni team operating remote-first since founding (2014). Extensive experience with the leading automation tools like Vanta and Drata; uses taskBARR audit-management platform plus Audora partnership for 30% efficiency gains. Cameron Kline elevated to VP, Attest Practice Leader (January 2026). Multiple Best Companies to Work For awards (Ingram's 2024; KCBJ Fastest-Growing Tech 2025).
Best for · Mid-market through enterprise companies needing multi-framework coverage (SOC 2 + FedRAMP, SOC 2 + PCI, SOC 2 + HITRUST). Cloud service providers pursuing FedRAMP authorization (Coalfire is a top-three 3PAO with 121+ FedRAMP assessments). Payment processors needing PCI DSS at Level 1 scale. Healthcare SaaS pursuing HITRUST + HIPAA. DoD contractors needing CMMC Level 2 via Coalfire Federal (operationally independent C3PAO entity).
Differentiator · One of the world's largest specialist compliance assessors, with 1,000+ team members, 1M+ assessment hours, and 600+ framework experts. Top-three FedRAMP 3PAO. 75% of SOC engagements serve cloud service providers (Google, Amazon, IBM, Microsoft trust Coalfire). 500+ SOC reports issued annually. Owned by Apax Partners since 2020. Coalfire Federal runs as an independent C3PAO entity (DIBCAC CMMC Level 2 re-certified with perfect score, July 2025). Brad Little became CEO January 2026 (ex-Google Cloud, ex-Capgemini), replacing 20-year CEO Tom McAndrew. Compliance Essentials platform launched MCP-compatible Audit AI in 2025-2026.
Best for · Healthcare and financial services companies needing data analytics
Differentiator · Risk-based audits with proprietary data analytics and AI tools
Best for · Growing and established organizations (roughly 50-1000 employees) wanting Big 4-caliber SOC 1/2/3, ISO 27001/27701/27017/27018, and ISO 42001 AI-governance audits with senior-led, competitively priced delivery
Differentiator · The only Canadian firm covering the full ISO gamut (27001/27701/27017/27018) and Canada's first SCC-accredited ISO 42001 (AI management system) auditor. Led by two former PwC partners (Mark Mandel and Jose Costa); every engagement is staffed entirely by senior auditors (10+ years Big 4 each) with no juniors and no offshore work. 350+ clients across Canada, North America, Europe, and Australia with 95% retention; IAF global certificate database verified. Joined the Axiom GRC family (alongside IS Partners and IMSM) in 2026, continuing to operate independently.
Best for · B2B SaaS startups (Series A through growth stage) using Drata, Vanta, or Secureframe and prioritizing speed without sacrificing thoroughness. AI/ML and LLM companies needing SOC 2 + ISO 42001 together — Prescient audits leading AI and large language model providers. Fintech, healthtech, and security vendors at scale. CSPs pursuing FedRAMP authorization. DoD contractors needing a full C3PAO (newly authorized March 2026). Teams already using Slack who want same-day audit communication.
Differentiator · One of the largest SOC 2 auditors globally for SaaS (fintech, healthtech, security) and AI companies — including major LLM providers — running 5,000+ audits a year across all standards. Cybersecurity-first DNA: founded by CREST-certified penetration testers, not traditional accountants. Run from a Nashville HQ with a distributed team of 200+ across the US, EMEA, and APAC and a same-day Slack/Teams response guarantee. SOC 2 engagements start at $10K with report delivery in 4-6 weeks once fieldwork begins. Authorized CMMC C3PAO as of March 2026 (joining FedRAMP 3PAO, PCI QSA, HITRUST, and ANAB ISO accreditation for 27001/27701/42001). The Cacilian PTaaS platform and CAIT (Continuous AI Tester) bring AI-driven offensive security into the audit workflow. A Top 20 CREST and CSA STAR organization globally, operating under Prescient Security Management LLC as an AICPA alternative practice structure.
Best for · Mid-sized tech and SaaS companies
Differentiator · Tech-focused SOC 1 and SOC 2 practice: cloud-native AWS/GCP/Azure fluency, platform-agnostic GRC integration (works with your existing Drata/Vanta/Secureframe, or use their own modern audit platform included in the fee), senior auditors engaging clients directly, reports within 3 weeks of fieldwork, transparent tiered pricing, and a growing AI-compliance focus
Best for · Defense contractors needing CMMC + FedRAMP, federal agencies requiring top-tier FedRAMP 3PAO, classified systems operators (ONLY auditor with DoD Facility Security Clearance), healthcare organizations needing HITRUST + SOC 2 bundles, companies wanting Top 50 CPA brand with multi-framework expertise
Differentiator · #1 FedRAMP 3PAO globally with unmatched government/defense expertise. ONLY audit firm with DoD Facility Security Clearance for classified assessments (unassailable competitive moat). Top 50 CPA firm issuing 1,000+ SOC reports annually. 'The Power of One' cross-compliance: SOC + ISO + FedRAMP + HITRUST + PCI + CMMC under single roof. Founded 2002, 20+ years compliance focus
Best for · VC-backed SaaS startups and Bay Area tech companies needing SOC 2 to unlock enterprise sales in 4-8 months. Cloud-native companies already using Drata, Vanta, Secureframe, or Sprinto. Companies combining SOC 2 + ISO 27001 (or SOC 2 + ISO 42001 for AI governance) in a single engagement. APAC-connected companies needing Essential 8, CDR, or GS 007 alongside US compliance. ESG-aware organizations that value B Corp status in their vendor chain.
Differentiator · Top 75 US CPA firm (Inside Public Accounting 2025) with deepest Bay Area VC ecosystem footprint among regional firms. Certified B Corporation (rare among CPA firms). Fixed-fee SOC 2 pricing marketed at 25-30% below comparable competitors. ANAB-accredited certification body for ISO 27001, 27701, 27017, 27018, AND ISO 42001 (AI management, issued directly, not via partner). April 2025 acquisition of AssuranceLab added 2,300+ combined clients across Americas/APAC/EMEA, making Sensiba one of the top three issuers of technology audit reports worldwide. PolicyTree auto-generates 21 mapped policies free for clients (also on AWS Marketplace). Managing Partner transition in May 2026: Monic Ramirez takes the role from John Sensiba (who continues as senior partner). Six new partners added May 2025 (largest single-year expansion in firm history).
Best for · Startups and growing SaaS, healthcare, and fintech companies (1–100 employees) needing a first-time SOC 2 or HIPAA audit fast and affordably across AWS, Azure, or GCP, with in-house penetration testing, vCISO support, and flexible payment terms
Differentiator · Boutique CPA firm built for startups: the full SOC 1/SOC 2/SOC 3, ISO 27001, HITRUST, and HIPAA stack plus in-house penetration testing and vCISO services, running hundreds of audits a year with a ~30-person team. Co-founded by President & CPA Lance Samona and CTO Patrick Sesi, a Drata Advanced Alliance Member rated 5.0 across 15 reviews, known for the fastest turnaround in the industry, 24/7 support, and flexible payment terms
Best for · Cloud service providers and SaaS companies seeking SOC 2 Type 2 and ISO certifications with cybersecurity rigor.
Differentiator · AI-assisted SOC 2 audits with PCAOB registration, deep cybersecurity expertise, and technical assessment services.
Best for · Mid-market organizations across a broad range of industries needing SOC 1 or SOC 2 reports from a full-service regional CPA firm with deep AICPA compliance experience.
Differentiator · Uses Fieldguide AI-native audit platform for evidence gathering and SOC delivery; AICPA peer-review contributors; LEA Global affiliate for international coverage; based in St. Louis since 1965.
Best for · EdTech companies, AI startups, SaaS providers seeking end-to-end SOC 2 readiness consulting with implementation support
Differentiator · vCISO-led consulting with ISMS SharePoint evidence management; guides organizations to readiness rather than conducting audits themselves; emphasis on practical, implementation-focused support and personalized approach
Best for · SaaS companies, technology-driven enterprises, and compliance-focused organizations needing independent assessment across SOC 2, ISO 27001, ISO 42001, CSA STAR, C5, CMMC, FedRAMP 20X, NIST, privacy, AI governance, or penetration testing
Differentiator · Consilium Labs provides SOC 2 audit services through a structured, evidence-based process, from scoping and evidence review through audit coordination and report delivery. Their approach emphasizes professionalism, clear execution, reliable delivery, and a modernized client experience.
Best for · Highly regulated and technology-focused organizations seeking Big Four-caliber SOC 2 audits with boutique-level partnership and strategic guidance
Differentiator · Big Four expertise with boutique accessibility; strong focus on AI governance and emerging technology risk; eight-year partnership continuity mentioned in testimonials
Best for · Cloud service providers pursuing FedRAMP combined with SOC 2; DoD contractors needing CMMC; organizations consolidating multiple annual compliance programs
Differentiator · FedRAMP 3PAO with 77+ assessments including FedRAMP High; proprietary XRAMP framework consolidates 6-11 annual authorizations into one continuous workstream; expert at combining FedRAMP + SOC 2 to reuse evidence; acquired Kovr.AI for AI-enhanced compliance; GovRAMP and StateRAMP authorized
Best for · Government contractors and cloud service providers needing specialized FedRAMP, CMMC, and SOC 2 compliance audits with expert advisory.
Differentiator · FedRAMP 3PAO and CMMC C3PAO assessor with proprietary IT Audit Machine platform and AI-enhanced Cybervisor advisory spanning 26+ years.
Best for · Modern SaaS, FinTech, Healthcare, and AI companies wanting a tech-enabled, lean audit process
Differentiator · Boutique CPA firm built from Big 4 (EY) IT-audit DNA; applies lean-manufacturing principles and AI/tech enablement to SOC engagements; explicitly platform-agnostic (no exclusive GRC partnership); offers SOC 1/2/3, HIPAA, GDPR, ISO 27001/27701/42001, CMMC, and AI assurance
Best for · Growing B2B SaaS companies moving upmarket requiring enterprise-grade SOC 2 with ISO 27001 and SWIFT compliance
Differentiator · Security-first methodology focused on actual risk reduction rather than checkbox compliance; led by ex-Accenture enterprise experts; custom controls documentation tailored to client stack
This list is filtered to firms that fit. Compare the best SOC 2 audit firms head to head, or browse every firm we track in the full SOC 2 auditor directory.
AI companies still need baseline security controls, but model deployment, training data, prompt handling, LLM providers, and ISO 42001 can change the evidence plan.
A generalist can audit the cloud controls. A specialist knows how to evaluate model governance without inventing custom criteria that buyers cannot interpret.
| Factor | AI-specialised | Generalist |
|---|---|---|
| Model versioning | Mapped to change management | Often ignored |
| Training data access | Evidence scoped | Generic access review |
| LLM providers | Subprocessor boundary clear | Vendor list only |
| ISO 42001 | Bundle possible | Referred out |
| Best fit | AI, ML, LLM, regulated AI | Simple SaaS with AI feature |
Five AI-specific areas that should map back to familiar SOC 2 evidence instead of becoming a vague side questionnaire.
Model versions, evaluation gates, deployment approvals, rollback procedures, and release logs can all map to change-management evidence.
Auditors need evidence for who can access training data, prompts, context stores, embeddings, logs, and customer data passed to AI providers.
OpenAI, Anthropic, Google, vector databases, and observability tools are subprocessors. Their SOC 2 reports cover their boundary, not your application layer.
Specialist firms may reference OWASP LLM Top 10 or similar practices while still mapping controls to SOC 2 criteria buyers understand.
ISO 42001 becomes relevant when buyers ask for formal AI governance. SOC 2+ AI can be lighter when buyers want AI criteria in a familiar report format.
AI scopes start near $7K for Type 2, then rise when ISO 42001, SOC 2+ AI criteria, regulated data, or extra Trust Service Criteria are in scope.
$15-70K
$10-50K
$8-20K
180-420 hrs
Five questions specific to SOC 2 vs ISO 42001, AI control evaluation, dual-scope auditors, LLM provider reports, and SOC 2+ AI.
Most AI companies need SOC 2 first. It is the baseline security attestation that US enterprise procurement requires, and it covers the controls your customers are most likely to ask about: access management, encryption, incident response, change management, and monitoring. ISO/IEC 42001 is the AI-specific standard, published in 2023, that addresses AI governance: risk identification for AI systems, transparency obligations, bias monitoring, and accountability structures specific to AI development and deployment. You need ISO 42001 when your buyers operate under EU AI Act obligations, when hospital or regulated-industry procurement teams ask for AI governance evidence specifically, or when your product's AI risk classification triggers governance requirements. For most US-focused AI startups closing their first enterprise contracts, SOC 2 unblocks the deal. ISO 42001 becomes relevant at growth stage when regulated verticals or European buyers are in the pipeline. Some CPA firms with ISO 42001 certification body accreditation can run both in a single engagement, which changes the economics: one observation period, shared evidence, one set of auditor fees.
AI-experienced auditors map ML-specific practices to the existing Trust Service Criteria rather than inventing new categories. Model versioning and deployment workflows are evaluated as change management controls: is model promotion to production authorized, tested, and logged? Training data access logs are evaluated as logical access controls: who can read, modify, or export training datasets, and are those permissions consistent with your documented access policies? Output validation pipelines and content filtering are evaluated under the Security criterion's monitoring and anomaly detection requirements. Prompt injection mitigations may be evaluated against OWASP LLM Top 10 as a reference framework. The auditor samples evidence across your observation period: model registry entries, deployment approval records, data access logs, incident tickets, and tests whether your controls operated consistently, not just whether they exist. A generalist auditor may not know which evidence to request or how to evaluate a model registry against change management criteria. That gap produces findings that specialist firms avoid.
Yes, if the CPA firm is also an accredited ISO 42001 certification body. These are distinct credentials: a CPA license and AICPA peer review are required to issue a SOC 2 report; ISO 42001 certification body accreditation is required to issue an ISO 42001 certificate. Some firms hold both. When they do, a dual-scope engagement uses one observation period and one set of fieldwork interviews, with evidence mapped to both frameworks simultaneously. Controls that satisfy SOC 2's Security criterion (access controls, risk assessments, monitoring procedures) overlap substantially with ISO 42001's AI governance requirements. The shared evidence base is what makes dual-scope engagements economical: you are not running two audits sequentially, you are running one engagement that produces two outputs. Not every firm on this list offers ISO 42001 certification; those that do are identified in their individual profiles. Confirm accreditation before assuming a firm can deliver both.
No. OpenAI, Anthropic, Google, and other LLM providers publish SOC 2 reports that cover their infrastructure and services. Those reports cover what they are responsible for: the model serving infrastructure, the API endpoints, and the data they process within their systems. They do not cover your application layer. Your prompt handling, system prompts, context injection, output parsing, customer data passed to the API, and the downstream logic that acts on model outputs are all in your scope, not theirs. The same principle applies to vector databases, ML observability platforms, and any AI infrastructure vendor you use. Each vendor's SOC 2 report covers their service boundary. Your SOC 2 audit covers how you built on top of those services, how customer data flows through your application, and whether your controls over that data are operating effectively. Enterprise buyers understand this; they will ask for your report separately from your subprocessors' reports.
SOC 2+ refers to a SOC 2 report that includes additional criteria beyond the standard Trust Service Criteria. The AICPA has published supplemental AI criteria that can be layered onto a base SOC 2 engagement, covering AI-specific controls around transparency, bias monitoring, model governance, and responsible AI practices. A SOC 2+ AI report is useful when a buyer wants AI governance evidence in the format they already know how to evaluate (SOC 2) but ISO 42001 is premature or not required. It is more lightweight than dual-scope ISO 42001 certification and does not require a separate certification body. You need it when enterprise buyers are asking AI-specific security questions that your base SOC 2 report does not address and you are not ready to pursue ISO 42001. It is not a substitute for ISO 42001 when EU AI Act compliance or formal AI management system certification is the actual requirement. Ask your auditor whether they offer SOC 2+ AI criteria as an add-on to your existing scope.
Use these when the buyer profile or framework scope is narrower than this page.
SOC 2 reports must be issued by licensed Certified Public Accountants under AICPA standards. ISO 42001 certification is a separate credential and does not replace SOC 2 attestation.
Confirm both sides of a dual-scope promise: CPA authority for SOC 2 and accreditation or partner coverage for ISO 42001. Shared evidence is useful only when both outputs are valid.
Pricing estimates and timelines are approximations based on public information and submitted data. Actual cost varies by model risk, data scope, buyer requirements, and framework bundle.
Tell us your model workflow, training data boundary, buyer requirements, and ISO 42001 interest. We route it to AI-fluent firms that can scope the real engagement.
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