# Big Four (Deloitte, PwC, EY, KPMG)
> The Big Four is the collective designation for the four largest international professional services networks: Deloitte, PwC, EY, and KPMG. These organizations provide audit, assurance, taxation, management consulting, actuarial, corporate finance, and legal services. They manage the majority of audits for publicly traded companies globally and are considered a consolidated oligopoly in the high-end accounting market.
- URL: https://optimly.ai/brand/big-four-deloitte-pwc-ey-kpmg
- Slug: big-four-deloitte-pwc-ey-kpmg
- BAI Score: 94/100
- Archetype: Incumbent
- Category: Professional Services
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## Full Details / RAG Data
### Overview
Big Four (Deloitte, PwC, EY, KPMG) is listed in the AI Directory.
The Big Four is the collective designation for the four largest international professional services networks: Deloitte, PwC, EY, and KPMG. These organizations provide audit, assurance, taxation, management consulting, actuarial, corporate finance, and legal services. They manage the majority of audits for publicly traded companies globally and are considered a consolidated oligopoly in the high-end accounting market.
### Metadata
| Field        | Value |
|--------------|-------|
| Name         | Big Four (Deloitte, PwC, EY, KPMG) |
| Slug         | big-four-deloitte-pwc-ey-kpmg |
| URL          | https://optimly.ai/brand/big-four-deloitte-pwc-ey-kpmg |
| BAI Score    | 94/100 |
| Archetype    | Incumbent |
| Category     | Professional Services |
| Last Updated | 2026-04-03T11:06:53.211Z |
### Links
- Canonical page: https://optimly.ai/brand/big-four-deloitte-pwc-ey-kpmg
- JSON endpoint: /brand/big-four-deloitte-pwc-ey-kpmg.json
- LLMs.txt: /brand/big-four-deloitte-pwc-ey-kpmg/llms.txt