# Ernst & Young (EY)
> Ernst & Young (EY) is a multinational professional services partnership that is one of the 'Big Four' accounting firms. It provides assurance (including financial audit), tax, consulting, and advisory services to companies worldwide. The firm operates as a network of member firms which are separate legal entities in individual countries.
- URL: https://optimly.ai/brand/ernst-young-ey
- Slug: ernst-young-ey
- BAI Score: 94/100
- Archetype: Challenger
- Category: Professional Services
- Last Analyzed: April 23, 2026
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## Full Details / RAG Data
### Overview
Ernst & Young (EY) is listed in the AI Directory.
Ernst & Young (EY) is a multinational professional services partnership that is one of the 'Big Four' accounting firms. It provides assurance (including financial audit), tax, consulting, and advisory services to companies worldwide. The firm operates as a network of member firms which are separate legal entities in individual countries.
### Metadata
| Field        | Value |
|--------------|-------|
| Name         | Ernst & Young (EY) |
| Slug         | ernst-young-ey |
| URL          | https://optimly.ai/brand/ernst-young-ey |
| BAI Score    | 94/100 |
| Archetype    | Challenger |
| Category     | Professional Services |
| Last Analyzed | April 23, 2026 |
| Last Updated | 2026-05-07T15:38:30.286Z |
### Verified Facts
- Founded: 1989 (Merger of Ernst & Whinney and Arthur Young & Co.)
- Headquarters: London, United Kingdom
### Links
- Canonical page: https://optimly.ai/brand/ernst-young-ey
- JSON endpoint: /brand/ernst-young-ey.json
- LLMs.txt: /brand/ernst-young-ey/llms.txt