| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| EVENT MARKETING ASSOCIATION LTD | 09842337 | 26/10/2015 | Dissolved |
| First Protocol (Germany) Ltd | 05566203 | 16/09/2005 | Dissolved |
| London Mice Ltd | 05138764 | 26/05/2004 | Dissolved |
| MICEBOOK LIMITED | 08995703 | 14/04/2014 | One Red Flag |
| Metropolis Productions Ltd | 03700922 | 25/01/1999 | Dissolved |
| Protocol One Ltd | 03250882 | 17/09/1996 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| COH ASSOCIATES LIMITED | 06440216 | 01/06/2011 | 10/12/2012 | Dissolved |
| FIRST PROTOCOL EVENT MANAGEMENT LIMITED | 03250890 | 17/09/1996 | 10/12/2012 | Amber |
| FIRST PROTOCOL GROUP LIMITED | 03250913 | 17/09/1996 | 10/12/2012 | Gold |
| HAPPY TRIBES LTD | 11812050 | 07/02/2019 | 01/12/2020 | Gold |
| INN OR OUT LIMITED | 03430050 | 04/12/2003 | 14/06/2004 | Dissolved |
| KNOLL LAWN TENNIS CLUB LIMITED | 00753433 | 25/01/2015 | 16/02/2020 | Gold |
| PURE EVENT MANAGEMENT & HOSPITALITY LIMITED | 04030140 | 31/03/2017 | 28/10/2021 | Bronze |