FT published a piece on possible Anthropic's auditor.

For the "Big Four", AI consulting is starting to limit which top AI companies they can independently audit.

EY appears to be Anthropic's likely auditor because the other Big Four firms have client-facing Anthropic alliances.

Deloitte, PwC and KPMG all have public Anthropic alliances that extend Claude into client delivery, implementation or jointly developed services.

SEC Rule 2-01 generally bars auditors from direct or material indirect business relationships with audit clients outside ordinary-course consumer dealings.