| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| GEOSCAN LIMITED | 02301350 | 30/07/2020 | Dissolved |
| SPECTRUM ENERGY AND INFORMATION TECHNOLOGY LIMITED | 06266892 | 30/07/2020 | Dissolved |
| SPECTRUM RESOURCES LIMITED | 02236114 | 30/07/2020 | Dissolved |
| TGS-NOPEC GEOPHYSICAL COMPANY (UK) LIMITED | 02896729 | 10/10/2016 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ACECA LIMITED | 03672833 | 10/10/2016 | 29/08/2022 | Dissolved |
| MAGSURVEY LIMITED | 04568744 | 10/10/2016 | 29/08/2022 | Dissolved |
| SPECTRUM DATAGRAPHIC SYSTEMS INTERNATIONAL LIMITED | 02046024 | 30/07/2020 | 29/08/2022 | Dissolved |
| SPECTRUM GEO LIMITED | 01979422 | 26/02/2020 | 29/08/2022 | Bronze |
| SPECTRUM GEOPHYSICAL SERVICES LIMITED | 01309396 | 30/07/2020 | 29/08/2022 | Dissolved |
| SPECTRUM INFORMATION TECHNOLOGY LIMITED | 01588885 | 30/07/2020 | 29/08/2022 | Dissolved |
| TGS GEOPHYSICAL COMPANY (UK) LIMITED | 05731700 | 14/02/2020 | 29/08/2022 | One Red Flag |
| TGS GEOPHYSICAL INVESTMENTS LIMITED | 09281097 | 14/02/2020 | 29/08/2022 | One Red Flag |