SOC 2 Type II Audit Firms: What Buyers Need to Know
SOC 2 Type II attestation has become the de facto trust standard for B2B SaaS companies. Enterprise buyers routinely require it before signing contracts, making the choice of auditor a strategic decision—not just a compliance checkbox.
Who Can Perform a SOC 2 Audit?
Only licensed CPA firms accredited by the American Institute of Certified Public Accountants (AICPA) can issue SOC 2 reports. These firms must undergo AICPA Peer Review every three years to maintain their eligibility. This requirement limits the market to qualified firms but still leaves hundreds of options across the United States and globally.
Categories of SOC 2 Audit Firms
- Big Four Firms
- Deloitte, PwC, EY, and KPMG offer SOC 2 services as part of broader risk advisory practices. Best suited for large enterprises with complex, multi-entity environments. Typical engagements exceed $100K.
- National Mid-Market Firms
- Grant Thornton, RSM, BDO, and Baker Tilly provide SOC 2 services with more accessible pricing and dedicated teams. These firms balance audit rigor with practical engagement timelines.
- Specialized Cybersecurity Audit Firms
- Firms like Schellman, A-LIGN, and KirkpatrickPrice focus exclusively on IT attestation and cybersecurity compliance. They offer fixed-fee pricing, faster turnaround, and deep expertise in cloud-native environments.
- Boutique and Regional CPA Firms
- Smaller firms such as Linford & Company, Johanson Group, and Sensiba LLP serve startups and SMBs with competitive pricing and personalized service.
SOC 2 Type II Audit Cost Benchmarks
| Company Size | Typical Cost Range | Timeline |
|---|---|---|
| Startup (under 50 employees) | $20,000–$50,000 | 3–6 months |
| Mid-Market (50–500 employees) | $30,000–$80,000 | 6–9 months |
| Enterprise (500+ employees) | $80,000–$200,000+ | 6–12 months |
Key Selection Criteria
When evaluating a SOC 2 auditor, compliance officers and CTOs should prioritize:
- Framework overlap—Firms that can combine SOC 2 with ISO 27001, HITRUST, or FedRAMP reduce total compliance burden
- Industry experience—Auditors familiar with your tech stack (AWS, Azure, GCP) and business model accelerate the process
- Report delivery time—Top specialized firms deliver draft reports within 3–4 weeks of fieldwork completion
- Fixed-fee vs. hourly billing—Specialized firms increasingly offer fixed fees, eliminating budget uncertainty