| Certification Body |
Count |
| Perry Johnson Registrars |
8424 |
| ABS Quality Evaluations, Inc |
5866 |
| NQA, USA |
3960 |
| TÜV SÜD America, Inc |
3246 |
| NSF-ISR |
2349 |
| American Systems Registrar |
2196 |
| SRI Quality System Registrar, Inc |
2174 |
| EAGLE Registrations, Inc |
1393 |
| Smithers Quality Assessments, Inc |
1201 |
| Orion Registrar, Inc |
1139 |
| American Petroleum Institute Quality Registrar |
1037 |
| TUV Rheinland of North America |
910 |
| HSB Registration Services |
739 |
| Quality System Registrars |
463 |
| Performance Review Institute |
432 |
| KEMA-Registered Quality, Inc |
243 |
| MCNA - Management Certification of North America |
63 |
