SOC 2 audit companies: Big Four, national, and specialist firms compared.

Best for · Enterprise IT Outsourcing Services, Managed Security, Customer Support, Healthcare Claims Management & Processing, and FinTech Services

Differentiator · Integrated compliance approach with strategic guidance; SOC 2+ hybrid assessments combining multiple frameworks (HIPAA, HITRUST, CSA STAR); established relationships with client continuity

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 · Nonprofit organizations, commercial companies, and wealthy individuals/estates seeking SOC 2 and LADMF certification

Differentiator · ACAB certification with extensive LADMF experience; PrimeGlobal member with global reach; 10% of net profits donated annually to nonprofits

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 · Southeast US companies and Atlanta tech corridor startups

Differentiator · Strong Southeast presence with competitive pricing

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 · UK SMEs needing SOC 2 preparation

Differentiator · SOC 2 readiness and preparation services

Best for · SaaS companies and organizations seeking first SOC 2 audits with company-specific, customized auditing rather than generic reports

Differentiator · Hundreds of completed examinations; tenured experts with management participation at project level; fixed-fee assessments; customized deliverables with no cookie-cutter content; focus on security program improvement beyond compliance checkbox

Best for · B2B SaaS companies and startups needing rapid SOC 2 compliance for enterprise sales

Differentiator · Europe's first ISO 42001-certified AI-native consultancy using AI-enhanced compliance methods with premium partnerships

Best for · Regional companies and mid-market firms seeking personalized service

Differentiator · 6th-largest US CPA firm formed by Baker Tilly + Moss Adams merger (June 2025). National reach with strong West Coast presence inherited from Moss Adams. BT Portal for audit management. Senior auditor involvement with 24-48 hour responsiveness.

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) in a single coordinated engagement. Healthcare technology pursuing HITRUST. Y Combinator-style SaaS startups already running Vanta who want a Vanta MSP partner that can attest. 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 four highest-regarded frameworks under one roof: ISO 27001, SOC 2, HITRUST, and PCI DSS. 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). Vanta Managed Service Provider; 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 · All industries across Australia

Differentiator · Broad industry coverage and personalized service

Best for · SMBs and mid-market Canadian organizations

Differentiator · Personalized service for Canadian market

Best for · International companies with US subsidiaries needing compliance

Differentiator · Strong international network and cross-border expertise

Best for · Midwest companies, ESOP-owned businesses, organizations seeking established regional firm with 90+ years experience

Differentiator · Founded 1934, 300+ employees including 100+ CPAs and 45 partners, 4 locations, B Corp certified (ethical standards), offers SOC 1/2/3 plus Microsoft SSPA attestations, fixed fee pricing model