Best SOC 2 Audit Firms Ranked for 2026

Choosing a SOC 2 audit firm is one of the highest-stakes vendor decisions a growing company makes. The report your auditor issues becomes the trust artifact your sales team hands to every enterprise prospect, so the firm's rigor, responsiveness, and platform fluency matter as much as price.

This is a tiered, evidence-based ranking built from our directory of 293 SOC 2 audit firms. We group firms into four tiers, Big Four, national, boutique, and platform-specialist, because "best" depends heavily on your company's size, budget, and compliance platform.

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What Are the Best SOC 2 Audit Firms?

The best SOC 2 audit firms are licensed CPA firms with a proven track record of attestation work matched to your company's size, industry, and audit history. There is no single best firm for every company. Big Four firms, national CPA firms, and boutique specialists each serve a different kind of client, and picking the wrong tier for your stage usually means overpaying or getting a firm that cannot move at your speed.

For most SaaS startups and mid-market companies, a boutique or national CPA firm with direct experience in your compliance platform (Drata, Vanta, Secureframe, or Sprinto) delivers the best combination of cost, speed, and audit quality. Big Four firms make sense once you have board, investor, or enterprise-customer requirements that specifically call for one.

How Do I Choose a SOC 2 Audit Firm?

Choose a SOC 2 audit firm by matching its tier and platform experience to your company's stage, then verifying fit with references and a scoping call before you sign. The right firm should be able to explain your audit timeline, fee structure, and platform workflow in the first conversation.

Beyond tier and platform fit, weigh these factors:

• Industry experience. Auditors who already work in your industry (healthcare, fintech, government) ask sharper scoping questions and catch industry-specific gaps earlier.
• Prior audit history. A firm that has completed thousands of SOC 2 engagements has seen more edge cases than one that treats SOC 2 as a side practice.
• Platform fluency. Firms listed in your compliance platform's partner directory can usually review evidence directly inside the tool instead of requesting manual exports.
• Pricing structure. Ask for a fixed-fee quote up front. Most firms in our directory price by custom quote, so get at least three bids before committing.
• Communication and timeline. A responsive firm that commits to a clear delivery date reduces the risk of your audit slipping past a customer deadline.

For a detailed breakdown of what audits actually cost at each tier, see our guide on SOC 2 audit cost in 2026.

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Our Methodology

This ranking is built from our directory of 293 SOC 2 audit firms, not a paid placement list. We grouped firms into tiers using four factors: firm size and market position (Big Four versus national versus boutique), breadth of compliance platform support (Drata, Vanta, Secureframe, Sprinto), industry and company-size focus, and verifiable trust signals such as CPA licensure, years of operation, and listings in platform partner directories.

We did not rank firms within each tier by a single composite score. Nearly every firm in our directory prices by custom quote rather than published rates, so a precise apples-to-apples cost ranking would overstate the precision of the underlying data. Instead, each tier groups firms that compete for the same type of client, and the write-up for each firm highlights what makes it a credible choice within that tier.

This page is updated as firms are added to or removed from the directory. If you run a SOC 2 audit firm and believe your listing needs a correction, you can claim and update your profile from your firm page.

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Big Four SOC 2 Audit Firms

The Big Four (Deloitte, PwC, KPMG, and EY) serve the largest enterprises and companies preparing for an IPO or facing board-level mandates for a name-brand auditor. All four price by custom quote, focus exclusively on enterprise clients, and do not publish standardized packages the way boutique firms do.

Deloitte runs one of the largest security and risk management practices in the industry and is a common choice for complex, multi-national SOC 2 engagements.

PwC has a strong risk assurance practice and is frequently used by large technology and financial services companies that already work with PwC on financial audits.

KPMG offers SOC 2 audits through its IT attestation practice, with a global risk management focus that suits multinational organizations.

EY provides technology risk assurance services, including SOC 2, and regularly works with large enterprises across multiple industries.

Big Four engagements typically cost far more than boutique or national alternatives and take longer to schedule, so most startups and mid-market SaaS companies are better served by the tiers below unless a specific enterprise customer, board, or investor requires a Big Four name.

National SOC 2 Audit Firms

National firms operate at meaningfully larger scale than boutique specialists while still focusing primarily on SOC 2 and adjacent attestation work, making them a strong middle ground for mid-market and scaling companies.

A-LIGN is the largest issuer of SOC 2 reports in our directory, having completed more than 16,000 audits since 2009. The firm supports Drata, Hyperproof, Secureframe, and Vanta, making it a safe default for companies on any major compliance platform.

Schellman focuses exclusively on attestation and cybersecurity assessments, including SOC 2, ISO 27001, HITRUST, FedRAMP, and PCI DSS. Schellman supports Drata and Vanta and is a common choice for mid-market and enterprise companies that need a firm comfortable running multiple frameworks in parallel.

Both firms serve SMB through enterprise clients and are well suited to companies that have outgrown a single-practitioner boutique firm but do not yet need Big Four scale.

Boutique SOC 2 Specialists

Boutique firms concentrate on SOC 2 and closely related frameworks, and many were founded by former Big Four auditors who wanted to serve smaller clients more directly. For startups and growth-stage SaaS companies, this tier usually delivers the best combination of speed, cost, and audit quality.

BARR Advisory specializes in SOC 2, ISO 27001, and FedRAMP for fast-growing SaaS and cloud-based companies. The firm supports Drata, Secureframe, Sprinto, and Vanta, and reports a net promoter score of 89, serving clients from seed stage through enterprise.

Linford & Company is staffed by former Big Four auditors and dedicates roughly 90 percent of its practice to SOC 2 work. The firm supports Drata and Secureframe and fits SMB through enterprise clients.

Sensiba is a top-75 U.S. CPA firm offering SOC 2 and ISO 27001 audits, with more than 2,000 completed audits and support for Drata, Vanta, Secureframe, and Sprinto. Sensiba serves seed-stage through mid-market companies.

IS Partners specializes in IT compliance and cybersecurity assurance across SOC 2, ISO 27001, HITRUST, and PCI DSS, and supports Drata for companies from SMB through enterprise.

Johanson Group runs a streamlined three-step SOC 2 process with reports typically delivered within four to six weeks, and supports Drata, Vanta, Secureframe, and Sprinto for SMB and mid-market clients.

Platform-Specialist SOC 2 Auditors

Some firms build their entire practice around a single compliance platform rather than supporting all of them. If your company has already standardized on one platform, a specialist firm can move faster because every part of its process assumes that tool.

Advantage Partners is a certified Vanta partner led by former Deloitte consultants, focused specifically on efficient SOC 2 attestations for small and startup technology companies already using Vanta.

BD Emerson was among the first Vanta-certified implementation partners and maintains a strategic partnership with Vanta, serving SMB and mid-market SaaS and technology companies.

Sentry Assurance was founded by former Big Four auditors and built its entire audit process around Drata's compliance automation workflow, serving SMB and mid-market technology companies.

If you are still choosing between a Big Four firm and a boutique specialist, our dedicated Big Four vs boutique SOC 2 auditors guide covers the tradeoffs in more depth. If you have not yet picked a compliance platform, see our best SOC 2 compliance platforms guide for a side-by-side comparison of Drata, Vanta, Secureframe, and Sprinto.

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Best SOC 2 Audit Firms FAQs

What is the best SOC 2 audit firm overall?

There is no single best firm for every company. The right choice depends on your company's size, industry, budget, and compliance platform. Boutique and national firms with direct platform experience usually serve startups and mid-market companies better than Big Four firms, which are built for large enterprises with board-level requirements.

How many SOC 2 audit firms are there?

Our directory tracks 293 SOC 2 audit firms across Big Four, national, boutique, and platform-specialist tiers. The market includes both dedicated attestation specialists and full-service accounting firms that offer SOC 2 as one of several services.

Do I need a Big Four firm for SOC 2?

Most companies do not need a Big Four firm. Big Four engagements make sense when a board, investor, or major enterprise customer specifically requires that brand name, or when you are preparing for an IPO. For most startups and mid-market SaaS companies, a boutique or national firm delivers comparable audit quality at a lower cost and faster timeline.

How much do the top SOC 2 audit firms charge?

Nearly every firm in this ranking prices by custom quote rather than a published rate card. Big Four engagements typically start around $60,000 and can exceed $150,000 for complex programs, while boutique and national firms typically range from $15,000 to $75,000 depending on scope. See our SOC 2 audit cost guide for a full breakdown by company stage.

What should I ask before hiring a SOC 2 audit firm?

Ask how many SOC 2 audits the firm has completed, whether they have direct experience with your compliance platform, what their typical timeline looks like from kickoff to report delivery, and whether their fee is fixed or subject to change based on findings. Get at least three quotes before choosing.

Are boutique SOC 2 firms as credible as Big Four firms?

Yes. SOC 2 reports follow a standard format set by the AICPA regardless of which licensed CPA firm performs the audit. A boutique firm's report carries the same professional weight as a Big Four firm's report; the difference is typically price, timeline, and how closely the firm's process matches your compliance platform, not the credibility of the opinion itself.

How do I verify a SOC 2 audit firm is legitimate?

Confirm the firm is a licensed CPA firm, ask for references from companies of similar size and industry, and check whether the firm is listed in your compliance platform's official partner directory. Firms that regularly work inside Drata, Vanta, Secureframe, or Sprinto typically appear in those platforms' partner listings.

Can I switch SOC 2 audit firms between Type I and Type II?

Yes, but it is usually smoother to stay with the same firm across your Type I and Type II engagements, since the auditor already understands your environment and control design. If you do switch, budget extra time for the new firm to review your prior report and re-establish scope.

Browse All 293 SOC 2 Audit Firms

You can browse all 293 firms in our directory, filter by platform, industry, and company size, and request quotes directly. Browse SOC 2 audit firms.