SOC 1 assessment firms
18 SOC 1 assessment practices, grouped by the buyer type they fit best. Each profile links to the firm's website. We are an independent directory -- not an assessment firm, and these listings are not paid placements or endorsements.
Provenance: profiles are compiled from each firm's public materials (September 2026); every price carries a source label. All 18 firm websites were verified in September 2026 during our pilot research, with six spot re-checks this week -- the verification log is on our methodology page.
For small service organizations
First SOC 1 examinations on a budget: boutique and startup-friendly CPA firms with efficient Type 1 practices.
| Firm | Type | SOC 1 planning range | Fieldwork window |
|---|---|---|---|
| Zero Day CPA | Boutique licensed CPA firm | $8K–$20K (planning estimate (Sept 2026)) | Type 1: 4–6 wk |
| Prescient Assurance | AICPA-accredited SOC audit firm | $10K–$25K (planning estimate (Sept 2026)) | Type 1: 4–6 wk |
| MJD Advisors | SOC-focused licensed CPA firm | $10K–$30K (planning estimate (Sept 2026)) | Type 1: 4–8 wk |
| Johanson Group, LLP | Licensed CPA firm focused on security compliance audits | $10K–$30K (planning estimate (Sept 2026)) | Type 1: 4–8 wk |
Planning ranges are not quotes. See our methodology for how prices are labeled and verified.
For mid-market service organizations
Growing scope or multi-location footprints: you need a credible examination practice, possibly with adjacent frameworks (SOC 2, ISO 27001) on the roadmap.
| Firm | Type | SOC 1 planning range | Fieldwork window |
|---|---|---|---|
| MJD Advisors | SOC-focused licensed CPA firm | $10K–$30K (planning estimate (Sept 2026)) | Type 1: 4–8 wk |
| Johanson Group, LLP | Licensed CPA firm focused on security compliance audits | $10K–$30K (planning estimate (Sept 2026)) | Type 1: 4–8 wk |
| Sensiba | Top-75 U.S. accounting and consulting firm | $15K–$45K (planning estimate (Sept 2026)) | Type 1: 4–8 wk |
| KirkpatrickPrice | Assurance specialist | $15K–$40K (planning estimate (Sept 2026)) | Type 1: 4–8 wk |
| 360 Advanced | Cybersecurity and compliance audit firm | $15K–$45K (planning estimate (Sept 2026)) | Type 1: 4–8 wk |
| BARR Advisory | Security and compliance advisory + attest practice | $15K–$50K (planning estimate (Sept 2026)) | Type 1: 4–8 wk |
| Armanino | National full-service CPA firm | $20K–$55K (planning estimate (Sept 2026)) | Type 1: 6–10 wk |
| Aprio | National full-service CPA and advisory firm | $20K–$55K (planning estimate (Sept 2026)) | Type 1: 6–10 wk |
| Withum | National top-ranking public accounting and advisory firm | $20K–$60K (planning estimate (Sept 2026)) | Type 1: 6–10 wk |
| A-LIGN | Licensed CPA firm | $25K–$70K (planning estimate (Sept 2026)) | Type 1: 6–10 wk |
| BDO | National full-service CPA firm | $30K–$90K (planning estimate (Sept 2026)) | Type 1: 6–12 wk |
| RSM | National CPA firm focused on the middle market | $30K–$85K (planning estimate (Sept 2026)) | Type 1: 6–12 wk |
| Grant Thornton | National full-service CPA and advisory firm | $30K–$95K (planning estimate (Sept 2026)) | Type 1: 6–12 wk |
Planning ranges are not quotes. See our methodology for how prices are labeled and verified.
For large enterprises
Type 2-required environments, complex systems, or global footprints -- deep benches, national delivery, and multi-framework breadth.
| Firm | Type | SOC 1 planning range | Fieldwork window |
|---|---|---|---|
| A-LIGN | Licensed CPA firm | $25K–$70K (planning estimate (Sept 2026)) | Type 1: 6–10 wk |
| BDO | National full-service CPA firm | $30K–$90K (planning estimate (Sept 2026)) | Type 1: 6–12 wk |
| RSM | National CPA firm focused on the middle market | $30K–$85K (planning estimate (Sept 2026)) | Type 1: 6–12 wk |
| Grant Thornton | National full-service CPA and advisory firm | $30K–$95K (planning estimate (Sept 2026)) | Type 1: 6–12 wk |
| Schellman | Top-50 CPA firm | $35K–$110K (planning estimate (Sept 2026)) | Type 1: 8–12 wk |
| Coalfire | Cybersecurity assessment and advisory firm | $35K–$120K (planning estimate (Sept 2026)) | Type 1: 8–12 wk |
| Deloitte | Big Four professional-services network | $50K–$200K (planning estimate (Sept 2026)) | Type 1: 8–16 wk |
Planning ranges are not quotes. See our methodology for how prices are labeled and verified.
All 18 assessor profiles
Zero Day CPA
Zero Day CPA is a Michigan-based boutique licensed CPA firm focused on SOC examinations for B2B SaaS and service organizations. Its SOC 1 practice covers readiness assessments, Type 1 and Type 2 examinations, and combined SOC 1 + SOC 2 programs with remote delivery.
Prescient Assurance
Prescient Assurance is an AICPA-accredited SOC audit firm that pairs audit teams with security-testing experience. Its SOC 1 practice serves SaaS companies needing Type 1 and Type 2 reports, with an emphasis on technology-driven, startup-friendly engagements.
MJD Advisors
MJD Advisors is a SOC-focused licensed CPA firm offering SOC 1 and SOC 2 examinations. Its focused practice model suits service organizations that want a dedicated SOC auditor rather than a generalist accounting firm.
Johanson Group, LLP
Johanson Group, LLP is a licensed CPA firm focused on security compliance audits, operating as a remote-first practice. Its SOC 1 examinations cover Type 1 and Type 2 reports for service organizations, alongside SOC 2 and ISO 27001 work.
Sensiba
Sensiba (Sensiba LLP) is a top-75 U.S. accounting firm whose risk assurance practice performs SOC 1 Type 1 and Type 2 examinations for technology and service organizations, alongside SOC 2, ISO 27001, and HITRUST work.
KirkpatrickPrice
KirkpatrickPrice is an assurance specialist performing SOC 1, SOC 2, and ISO 27001 examinations. Its SOC 1 practice issues Type 1 and Type 2 reports for service organizations, with a focus on the mid-market.
360 Advanced
360 Advanced is a cybersecurity and compliance audit firm whose licensed CPA practice issues SOC 1 Type 1 and Type 2 reports. It pairs SOC examinations with penetration testing and broader compliance work for service organizations.
BARR Advisory
BARR Advisory combines security and compliance advisory with an attest practice issuing SOC 1 Type 1 and Type 2 reports. It is known for cloud-native clientele and combined SOC 1 + SOC 2 + ISO programs.
Armanino
Armanino LLP is a national full-service CPA firm whose risk assurance practice performs SOC 1 Type 1 and Type 2 examinations for service organizations, alongside SOC 2 and ISO 27001 work.
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Get matched quotesAprio
Aprio is a national CPA and advisory firm whose assurance practice issues SOC 1 Type 1 and Type 2 reports for service organizations across technology, financial services, and healthcare.
Withum
Withum is a national public accounting firm whose SOC practice performs SOC 1 Type 1 and Type 2 examinations for service organizations, with particular depth in technology and financial services.
A-LIGN
A-LIGN is a licensed CPA firm known for technology-enabled audit delivery. Its SOC 1 practice issues Type 1 and Type 2 reports at scale, often combined with SOC 2, ISO 27001, and FedRAMP work under one evidence set.
BDO
BDO is a top-10 U.S. CPA firm whose assurance practice performs SOC 1 Type 1 and Type 2 examinations for large service organizations, often as part of broader financial-statement and ICFR-related audit relationships.
RSM
RSM is a national CPA firm focused on the middle market. Its risk consulting practice issues SOC 1 Type 1 and Type 2 reports for service organizations, frequently alongside financial audit and ICFR work.
Grant Thornton
Grant Thornton is a national CPA and advisory firm whose audit practice performs SOC 1 Type 1 and Type 2 examinations, often for clients whose user entities rely on the reports for their own ICFR audits.
Schellman
Schellman (Schellman & Company, LLC) is a top-50 CPA firm and one of the largest SOC practices in the country. Its SOC 1 practice issues Type 1 and Type 2 reports for service organizations of every size, with independence-first methodology.
Coalfire
Coalfire is one of the largest cybersecurity assessment practices in the world. Its assurance practice performs SOC 1 and SOC 2 examinations for large service organizations, paired with deep testing and advisory benches.
Deloitte
Deloitte's assurance network performs SOC 1 Type 1 and Type 2 examinations globally, frequently for service organizations whose user entities are themselves audited by Big Four firms and need maximum report reliance.
How we built this directory
- Real firms only. Every listing is an operating SOC 1 assessment practice with a directly load-verified website (September 2026). A verification log is on our methodology page.
- Labeled prices, never quotes. Each firm's planning range is marked firm-published, published planning range, or not published. None of these are quotes -- get scoped fees in writing.
- No fabricated ratings. You will not find star ratings, testimonials, or review counts here -- we have not hired these firms and will not invent social proof.
- No pay-for-rank. Firms cannot pay to be listed, ranked, or recommended. Ever.
- How we make money: when you request quotes, we may introduce you to assessment firms. That never changes what you pay the assessor.
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