| Firm Name | Origin | Global Headquarters | Global Revenue (Latest Year) | Global Presence (Countries) |
| Deloitte | 1845, London, UK | New York City, USA | $64.9 Billion (FY 2023) | 150+ |
| PwC | 1849, London, UK | London, UK | $53.1 Billion (FY 2023) | 151 |
| EY | 1849, England, UK | London, UK | $49.4 Billion (FY 2023) | 150+ |
| KPMG | 1987, Netherlands | Amstelveen, Netherlands | $36.4 Billion (FY 2023) | 143 |
| BDO | 1963, Europe | Zaventem, Belgium | $14 Billion (FY 2023) | 166 |
| RSM | 1964 | London, UK | $9.4 Billion (FY 2023) | ~120 |
| Grant Thornton | 1924, UK | London, UK | $7.5 Billion (FY 2023) | 149 |
| Baker Tilly | 1987 | London, UK | $5.2 Billion (FY 2023) | 141 |
| Crowe Global | 1915, USA | New York City, USA | $4.3 Billion (FY 2023) | 140+ |
| CLA Global | 2012, USA | Minneapolis, USA | ~$1.9 Billion (CLA US Revenue FY 2023) | 100+ (Member Firms) |
| Nexia Intl. | 1971 | London, UK | $5.4 Billion (FY 2023) | 120+ |
| Forvis Mazars | 2024 (Merger) | N/A (Global Network) | ~$5 Billion (Pro-forma) | 100+ |
| CBIZ | 1996, USA | Cleveland, USA | $1.63 Billion (FY 2023) | Primarily USA |
