SOC 2 auditors, compared.

A SOC 2 auditor is an AICPA-licensed CPA firm authorized to issue SOC 2 attestation reports — Type 1 (point-in-time) or Type 2 (3–12 month observation period). Consulting firms and compliance platforms cannot issue SOC 2 reports; only CPA firms can. Every firm in this directory holds an active CPA license.

The top SOC 2 auditors in this directory are Prescient Security, Schellman, A-LIGN, Thoropass, Johanson Group, Linford & Company, Sensiba LLP, Armanino, CBIZ, and Deloitte — chosen across specialist, regional, national, and Big Four tiers. Best fit depends on company stage, industry, and price tolerance. The comparison table above shows the trade-offs.

SOC 2 auditor fees range from $7,500 (specialist Type 1 for early-stage startups) to $400,000+ (Big Four enterprise Type 2). The median Type 2 audit for a growth-stage SaaS company runs $25,000–$45,000. A compliance platform (Vanta, Drata, Secureframe) adds $5,000–$15,000/year on top of the audit fee.

Match the auditor's tier to your buyer's expectations. Enterprise prospects often require a Big Four or national firm; startups usually choose specialists for speed and flat-rate pricing. Verify AICPA peer-review status, ask for references in your industry, and confirm pricing structure before signing.

Yes. SOC 2 audits can only be performed by AICPA-licensed CPA firms. Consultants can prepare you for the audit (readiness work) but cannot sign the report. Always verify the firm's CPA license and current peer-review status before engaging.

The auditor is the same firm; Type 1 versus Type 2 refers to scope. Type 1 confirms controls are designed correctly at a point in time. Type 2 confirms they operated effectively across a 3–12 month observation window. Most enterprise customers will eventually require Type 2.

A Type 1 audit takes 4–8 weeks for a company that's already prepared. A Type 2 takes 3–6 months end-to-end, including the observation window. Specialist firms using Vanta or Drata integrations compress evidence collection from weeks to days. Add 4–8 weeks of readiness work if controls aren't yet in place.

Every CPA firm performing SOC 2 audits must complete an AICPA peer review every three years. The peer review evaluates the firm's audit methodology and quality control. A firm without current peer-review status cannot legitimately issue a SOC 2 report — verify it before signing.

Yes — any AICPA-licensed CPA firm with current peer-review status can issue a SOC 2 report. But small generalist firms often lack SaaS and cloud security experience, which slows the audit and produces reports enterprise buyers question. Tech companies typically get faster, more credible reports from SOC 2 specialists.

Specialist firms (Prescient Security, A-LIGN, Thoropass, Johanson Group) are usually the best fit for SaaS startups. They integrate with Vanta, Drata, and Secureframe, deliver Type 1 in 4–8 weeks, and price flat-rate at $15K–$35K. Big Four firms are normally overkill at this stage and cost 3–5x more.

SOC 2 auditors are regulated through the AICPA via licensure, mandatory peer review every three years, and the SSAE 18 attestation standard. There is no SOC-specific regulator. State Boards of Accountancy license individual CPAs and discipline firms for misconduct.

Most firms that offer SOC 2 also offer SOC 1, but the two audits address different risks. SOC 1 covers financial reporting controls (Sarbanes-Oxley adjacent). SOC 2 covers security, availability, processing integrity, confidentiality, and privacy. Many SaaS companies only need SOC 2.

You can switch auditors between annual audits, and most firms do change every 2–3 years. Switching mid-engagement is rare and typically restarts the readiness process. Common reasons to switch: rising prices, slow turnaround, or graduating from a generalist to a specialist firm as your company grows.

A SOC 2 auditor tests your security controls against the AICPA Trust Services Criteria — the Common Criteria (CC1–CC9) plus four optional categories: Availability, Processing Integrity, Confidentiality, and Privacy. They review evidence (policies, system configurations, access logs) and interview staff to confirm controls operate as designed.

Most specialist and mid-tier firms charge a flat fee for a defined scope. National and Big Four firms more often bill hourly or use tiered SOWs that add costs when scope changes. Flat-rate pricing is the buyer-friendly model — confirm the structure and exclusions in writing before signing.