All four Big Four firms (Deloitte, PwC, EY, KPMG) for buyers who specifically need a Big Four name on their SOC 2 — typically pre-IPO companies, PE-backed firms, multinationals, or buyers whose enterprise customers require it. We also list mid-tier alternatives that cover similar engagement scope at a lower entry price.
How we picked: All four Big Four firms (Deloitte, PwC, EY, KPMG) for buyers who specifically need a Big Four name on their SOC 2 — typically pre-IPO companies, PE-backed firms, multinationals, or buyers whose enterprise customers require it. We also list mid-tier alternatives that cover similar engagement scope at a lower entry price.
All Big Four firms in the directory are listed first. Within Big Four, we ordered by confirmed peer review status (all pass) and breadth of services. We then add Grant Thornton, RSM US, and BDO USA as the strongest mid-tier alternatives — all with confirmed peer review pass and overlap in industry served.
Best for: Pre-IPO companies and multinationals where 'Big Four' is a procurement requirement
Pricing: Documented engagement range: $50,000–$150,000
Best for: Companies wanting Big Four SOC 2 alongside FedRAMP or HITRUST capability
Pricing: Contact for pricing
Best for: Multinational buyers wanting Big Four with strong ISO 27001 capability
Pricing: Contact for pricing
Best for: Buyers wanting Big Four with documented short fieldwork timelines
Pricing: Documented engagement range: $40,000–$150,000
Best for: Mid-tier alternative when Big Four is overkill but tier-2 national is the right fit
Pricing: Contact for pricing
Best for: Mid-market companies wanting national-firm scale at lower entry than Big Four
Pricing: Contact for pricing
Best for: Mid-tier national alternative with confirmed peer review and broad services
Pricing: Contact for pricing
Most companies do not actually need Big Four for SOC 2. Mid-tier specialists like Schellman, A-LIGN, and BARR Advisory deliver comparable audit quality at a meaningfully lower price for the typical SaaS buyer. Big Four is best when (a) procurement explicitly requires it, (b) audit work is consolidated with an existing Big Four financial-statement audit, or (c) you are pre-IPO and want continuity through your S-1.