Quick answer: A SOC 2 auditor must be a licensed CPA firm (or CPA-led practice) authorized by the AICPA. They are the only professionals legally qualified to issue an official SOC 2 report. Boutique CPA firms specialize in startups and offer faster timelines and fixed fees. Big Four firms serve enterprise clients and multinationals. The 10 firms below cover the full range. None is universally "the best." The right one depends on your stage, your stack, and what your enterprise customers actually require.
Key takeaways about SOC 2 auditors
- Only AICPA-licensed CPA firms can issue a valid SOC 2 report. No exceptions.
- Big Four firms are appropriate for enterprise and multinational organizations, not first-time startup audits.
- Boutique CPA firms offer equivalent reports at significantly lower cost for companies under 200 employees.
- Multi-framework auditors (SOC 2 + ISO 27001 + HIPAA in one engagement) reduce total compliance cost by 30 to 50 percent.
- Compliance automation platforms (Vanta, Drata, Secureframe) cut evidence collection time and unlock partner pricing with several auditors on this list.
How we evaluated these SOC 2 auditors
Before listing firms, here are the five criteria I use when advising clients on which auditor to engage. None of these criteria produce a single "winner." They surface which firms fit which kind of company.
AICPA licensure and Peer Review standing. Every firm on this list holds an active AICPA Peer Review. You can verify this yourself at the AICPA Peer Review database. Firms that use unlicensed subcontractors to perform testing do not qualify.
Experience at your company size. A Big Four firm charging $80,000 for a SOC 2 Type 2 audit is categorized as enterprise-only here. Startups below 100 employees rarely benefit from Big Four brand spend when boutique firms issue equally valid reports.
Multi-framework support. Companies that pursue ISO 27001, HIPAA, or FedRAMP alongside SOC 2 reduce total compliance cost by 10 to 20 percent when using a single firm for all frameworks. I weighted firms higher when they offered credible overlapping assessments.
Automation platform compatibility. Firms that integrate directly with Vanta, Drata, Secureframe, or Tugboat Logic cut evidence collection time significantly.
Reporting transparency. The best firms are explicit about what passes, what qualifies with exceptions, and how the Type 2 observation period will be structured.
SOC 2 auditors at a glance: comparison table
Pricing tiers: $ = under 5k | $$ = 5k to $15k | $$$ = 15k to $30k | $$$$ = $30k+
Want a precise estimate for your stage? Use our SOC 2 audit cost calculator to model Type 1 and Type 2 pricing based on your company size, framework scope, and current evidence maturity.
SOC 2 auditors to consider in 2026
These 10 firms are grouped by the kind of company they fit, not by a quality ranking.
Within each group the firms are roughly interchangeable on quality. The differentiators are pricing, framework coverage, and engagement style.
Boutique CPA firms: best for early-stage startups
These four firms specialize in seed to Series A SaaS companies. They offer fixed-fee engagements, right-sized scoping, and faster turnaround than mid-market or Big Four firms. If this is your first SOC 2, start here.
Johanson Group LLP
Category: Boutique | Pricing tier: $$ | Best for: Seed and Series A startups
Johanson Group is one of the most startup-friendly SOC 2 CPA firms in the market. They specialize in SOC 2 Type 1 and Type 2, move quickly, and structure engagements around the realities of small engineering teams rather than the expectations of enterprise audit programs.
URL: https://www.johansonllp.com/
Constellation GRC
Category: Boutique | Pricing tier: $ | Best for: Early-stage SaaS, lean evidence approach
Constellation GRC is a specialist boutique focused on right-sized compliance for early-stage companies. Their strength is defining evidence requirements that are realistic for a team of 5 to 30 engineers, rather than importing enterprise-scale evidence templates that no startup can sustain through a 12-month observation period.
URL: https://www.constellationgrc.com/
Insight Assurance
Category: Boutique | Pricing tier: $$ | Best for: Multi-framework SaaS,
Insight Assurance positions itself around responsiveness and multi-framework execution. Early-stage companies in time-zone-distributed teams or with hard customer contract deadlines genuinely benefit from faster audit communication cycles.
URL: https://insightassurance.com/
Prescient Security
Category: Boutique | Pricing tier: $$ | Best for: SaaS with application security requirements
Prescient Security sits at the intersection of SOC 2 auditing and application security, which is a meaningful differentiator for SaaS companies that store sensitive user data and need their audit team to understand SDLC controls, SAST/DAST tooling, and secure development practices.
URL: https://prescientsecurity.com/
Mid-market firms: best for growth-stage SaaS
These four firms suit companies that have outgrown boutique scoping or need multi-framework coverage. They cost more than boutique firms but typically less than Big Four. All four integrate with at least one major automation platform.
Schellman & Company
Category: Mid-market | Pricing tier: $$$ | Best for: SaaS, cloud infrastructure
Schellman is consistently one of the most referenced firms in competitive SOC 2 evaluations, and for good reason. They are AICPA-licensed, cloud-native in their methodology, and operate at a scale that suits growth-stage SaaS companies that have moved past seed-stage but are not yet enterprise.
URL: https://www.schellman.com/
A-LIGN
Category: Mid-market | Pricing tier: $$$ | Best for: SaaS, healthtech, financial services
A-LIGN is the firm that many mid-market SaaS companies discover after their first audit cycle. They are prolific auditors with deep volume across SOC 2 and FedRAMP, and they move faster than most firms at their price point.
BARR Advisory
Category: Mid-market | Pricing tier: $$$ | Best for: Cloud-native SaaS, AWS-heavy stacks
BARR Advisory occupies a specific niche: growth-stage SaaS companies that run primarily on AWS and need an auditor who treats cloud evidence as native, not as a special case. They are a cloud-focused firm, which means their audit team is not context-switching between legacy on-prem engagements and modern SaaS architecture.
URL: https://www.barradvisory.com/
Coalfire
Category: Mid-market | Pricing tier: $$$ | Best for: FedRAMP, defense contractors, PCI
Coalfire is primarily known for FedRAMP 3PAO work and PCI DSS QSA assessments, but their SOC 2 practice is substantial and well-resourced. They are the natural choice when SOC 2 is one component of a broader federal or payments compliance program.
Big Four: best for enterprise and multinationals
The Big Four are the right choice when your enterprise customer specifically requires a Big Four name on the report, or when you operate across multiple international entities and need that coordination capacity. For most SaaS startups, they are the wrong choice. The pricing premium is significant and the report is functionally equivalent to one from an AICPA-licensed boutique firm.
EY
Category: Big Four | Pricing tier: $$$$ | Best for: Enterprise, multinationals
EY runs one of the largest SOC practice groups in the world and is the default choice for public companies, multinationals, and organizations that sell into regulated verticals where the Big Four brand carries procurement weight.
URL: https://www.ey.com/
PwC
Category: Big Four | Pricing tier: $$$$ | Best for: Enterprise, regulated industries
PwC's Cybersecurity, Privacy and Forensics practice covers SOC 2 alongside a wide portfolio of assurance and advisory services. Like EY, PwC is built for scale and is frequently mandated by enterprise buyers in banking, insurance, and government-adjacent SaaS.
URL: https://www.pwc.com/
Best SOC 2 auditors for startups and small companies
Most companies reading this guide are early-stage SaaS: pre-revenue to Series B, with engineering teams under 50 people, often facing their first SOC 2 because an enterprise deal is contingent on it. The right auditor for this segment is rarely a Big Four firm and is often not a mid-market firm either. Here is how the field looks when you filter for fit at this stage.
For your first SOC 2 audit (Type 1 or Type 2)
These firms specialize in scoping engagements to what a small engineering team can sustain through a full Type 2 observation period:
- Johanson Group LLP offers fixed-fee pricing and the fastest turnaround in the boutique category. The default choice for first-time SOC 2 buyers at seed and Series A.
- Constellation GRC builds evidence collection into tooling you already use (GitHub Actions, Jira, AWS Config) so the audit does not require adopting new processes.
- Prescient Security combines SOC 2 with application security expertise. Useful for SaaS handling sensitive user data that faces enterprise security questionnaires alongside the report requirement.
When to skip the Big Four
If you are below 200 employees and your enterprise customer does not specifically require a Big Four name on the report, do not engage EY or PwC. I have seen Series B companies overspend by $20,000 to $40,000 on Big Four engagements that delivered no incremental value at procurement. Confirm the customer requirement in writing before shortlisting Big Four firms.
Realistic timelines for a first audit
- Type 1: 3 to 4 months from kickoff to report.
- Type 2: 10 to 14 months including the observation period.
Boutique firms (Johanson, Constellation, Insight) typically sit at the faster end of these ranges. Mid-market firms can extend timelines by 4 to 8 weeks on a first engagement because their default scope assumes more complex environments.
How to choose the right SOC 2 auditor for your stage
The decision comes down to four questions. Answer them honestly and the right firm becomes clear.
1. What does your largest prospect or customer actually require?
Some enterprise procurement teams accept any AICPA-licensed CPA firm's SOC 2 report. Others specify a short list of approved auditors. Ask your sales team or check the customer's vendor risk assessment form before shortlisting. I have seen Series B companies overspend on Big Four auditors because nobody confirmed whether the customer required it.
2. What is your engineering team's evidence collection capacity?
A Type 2 audit covers a 6 to 12-month observation period. Your team will pull evidence at least quarterly, sometimes monthly. A boutique firm that right-sizes evidence requirements is far less burdensome than a mid-market firm that imports a standard evidence template designed for 1,000-person organizations.
3. Are you pursuing multiple frameworks in the next 18 months?
If ISO 27001, HIPAA, or FedRAMP are on your roadmap, choose a firm with credible multi-framework capability now. The rework cost of switching auditors between frameworks is significant, and coordinated audits reduce total evidence collection overhead by 30 to 50 percent.
4. What does your budget allow without constraining your engineering roadmap?
A $10,000 difference in audit cost is meaningful at seed stage and irrelevant at Series C. At seed and Series A, boutique firms deliver equivalent reports for less. Calibrate the auditor choice to your actual stage, not your aspirational one.
Not sure what your audit will cost? Run our SOC 2 audit cost calculator for a stage-appropriate estimate, or read SOC 2 certification cost in 2026 for a full breakdown of audit fees, readiness costs, and platform subscriptions.
Red flags when evaluating SOC 2 auditors
I have disqualified firms from consideration for the following reasons. Treat any of these as a hard stop.
Unlicensed subcontractors performing testing. The partner firm is AICPA-licensed but the actual audit work is performed by unaffiliated third parties without CPA credentials. This violates AICPA standards and produces a report that sophisticated buyers may challenge. Always ask who performs the testing and verify their licensure.
Guarantees of a clean report. No legitimate auditor can promise a clean Type 2 report before the observation period begins. Any firm that implies otherwise is either misrepresenting the process or signaling they intend to issue a report regardless of what testing finds.
Resistance to fixed-fee pricing. Boutique firms regularly offer fixed fees for well-scoped engagements. A firm that refuses to provide even a fixed-fee estimate after reviewing your scope is signaling either inexperience with startups or misaligned incentives.
After your first SOC 2 audit: staying compliant
Getting through your first Type 2 audit is 60 percent of the work. The other 40 percent is sustaining the evidence cadence through subsequent observation periods.
The most common failure I see after a successful first Type 2: companies let their evidence collection degrade in the six months after the report is issued, then scramble to reconstruct three to six months of missing evidence before the next audit kickoff. This is entirely preventable.
Quarterly evidence checkpoints. Schedule four 45-minute evidence reviews per year with your internal security owner. Pull evidence from your automation platform, confirm coverage matches your control descriptions, and flag gaps immediately.
Annual control review. At least once per year, review your control set against changes in your infrastructure, product, and personnel. Controls that reference deprecated systems create unnecessary audit findings. Update your system description and control list before your auditor does it for you.
Auditor continuity. Staying with the same firm for your second and third Type 2 cycle reduces preparation burden. Your auditor already understands your system boundaries, control rationale, and evidence formats. Switching firms resets that context and typically extends the next audit timeline.
Connect compliance to revenue. SOC 2 Type 2 is increasingly a procurement prerequisite for enterprise deals above $50,000 ACV. Track which customer deals reference your report as a requirement and measure the ARR impact. This turns the annual audit investment into a revenue line, not a cost center.
FAQ: common questions about SOC 2 auditors
Who is authorized to issue a valid SOC 2 report?
Only AICPA-licensed CPA firms (or CPA-led practices that meet AICPA standards) can issue official SOC 2 reports. Cybersecurity firms, IT consultancies, and compliance platform vendors are not authorized to issue SOC 2 reports regardless of their security credentials. Verify any firm's AICPA Peer Review standing at peerreview.aicpa.org before signing an engagement letter.
How should I choose the right SOC 2 auditor for my company?
Match the auditor to your stage, not your aspirations. Seed and Series A companies benefit most from boutique CPA firms that offer fixed-fee engagements, right-sized evidence requirements, and fast turnaround. Growth-stage companies benefit from mid-market firms with multi-framework depth and automation integrations. Big Four firms are appropriate when enterprise customers specifically require them.
What are the four phases of a SOC 2 audit?
Phase 1 is scoping: defining your system boundaries and evidence requirements. Phase 2 is evidence collection: gathering logs, access records, configuration screenshots, and policy documents across the observation period. Phase 3 is testing: the auditor evaluates whether controls operated effectively during the period. Phase 4 is reporting: the auditor issues a Type 1 (point-in-time) or Type 2 (period-of-time) report with any exceptions noted.
Which SOC 2 auditors are best for startups?
For seed and Series A companies, Johanson Group LLP, Constellation GRC, and Precient Security specialize in startup-stage engagements and offer fixed-fee pricing with right-sized scoping.
Can organizations outside the US use SOC 2 auditors?
Yes. SOC 2 is an AICPA framework but there is no geographic restriction on which organizations can be audited. Non-US organizations commonly pursue SOC 2 when they sell to US enterprise customers. Most firms on this list audit international entities, and the engagement is conducted under AICPA standards regardless of where the organization is headquartered. For organizations in the EU, a SOC 2 plus ISO 27001 combined audit is the most efficient path to covering both US and European buyer requirements.
How often should you engage SOC 2 auditors?
SOC 2 Type 2 reports cover a specific observation period (typically 12 months). Most enterprise customers expect annual renewal. Engage your auditor 60 to 90 days before you want the report issued to allow time for planning, evidence collection, and testing. If you use a compliance automation platform, build your evidence collection schedule so that 12 months of continuous evidence is available before audit kickoff.
How SecureLeap Can Fast-Track Your Compliance Journey
SecureLeap provides cybersecurity compliance consulting tailored for fast-moving startups. We act as your dedicated internal security team, handling the heavy lifting of compliance so you can focus on growth and closing enterprise deals. Whether you are facing a strict deadline for a vendor security questionnaire or building a long-term security posture, we ensure you are audit-ready without the chaos.
Here is how we partner with you:
- SOC 2 & ISO 27001 Consulting: We scope your boundaries, identify gaps, and implement sustainable controls before the auditor arrives. We help you avoid the expensive delays companies face when they skip proper readiness planning.
- Expert Penetration Testing: We conduct manual, expert-led testing (Web, Mobile, API, or Cloud) designed to uncover real-world vulnerabilities, strengthen your systems, and satisfy strict enterprise procurement requirements.
- Compliance Automation Support: If you use platforms like Vanta, Drata, or Secureframe, we map your controls and configure continuous evidence collection so your data is always audit-ready. (Ask us about our 20% partner discount).
- Audit Facilitation: We handle the auditor relationship from start to finish. We schedule walkthroughs, compile evidence packages, and translate auditor-speak into clear engineering tasks so your team isn't distracted.
- Virtual CISO (vCISO): For companies without a dedicated security leader, our vCISO service delivers senior-level strategy, manages your compliance roadmap, and sits on calls with your enterprise prospects when you need executive backup.
👉 Book a Free Consultation and get a personalized compliance roadmap tailored to your business, budget, and timeline.
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