# 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