| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CORE LABORATORIES (U.K.) IP CO. LTD. | 08772020 | 26/11/2013 | Dissolved |
| CORE LABORATORIES (U.K.) LIMITED | 02924532 | 31/07/2009 | Bronze |
| CORE LABORATORIES INTERESTS ONE LIMITED | 07586421 | 18/05/2011 | One Red Flag |
| CORE LABORATORIES INTERESTS TWO LIMITED | 07586453 | 18/05/2011 | One Red Flag |
| CORETON LIMITED | 01302137 | 31/07/2009 | Not Trading |
| GUARDIAN GLOBAL TECHNOLOGIES LIMITED | 06526912 | 25/09/2018 | One Red Flag |
| GUARDIAN GLOBAL TECHNOLOGY GROUP LTD | 04933891 | 25/09/2018 | Amber |
| GUARDIAN HOLDINGS LIMITED | 06518981 | 25/09/2018 | Amber |
| LABTON LIMITED | 02502923 | 31/07/2009 | Not Trading |
| OWEN OIL TOOLS (U.K.) LIMITED | 03691954 | 31/07/2009 | One Red Flag |
| QUANTOIL LIMITED | 03021445 | 06/02/2012 | Bronze |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|