All Three Big Four Firms Now Standardized on Claude

Deloitte (470K employees), PwC, and KPMG (276K employees in 138 countries) have all committed to enterprise-wide Claude deployment by September 2026 — roughly 1.1 million professionals total. The KPMG deployment (announced May 19) integrates Claude Cowork and Managed Agents directly into KPMG's client delivery platform, Digital Gateway on Azure. For developers: if your company uses any of these firms, Claude is likely already entering your workflows through the advisory relationship.

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Sources: KPMG Press Release · Build Fast with AI