| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CROFT EXPLORATION LIMITED | SC092120 | 14/02/2014 | Dissolved |
| ITHACA SPL LIMITED | 01275469 | 01/02/2021 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BITTERN AND TRITON (UK) LIMITED | 07776994 | 01/10/2012 | 07/06/2017 | Dissolved |
| DANA PETROLEUM (E&P) LIMITED | 02294746 | 17/01/2012 | 07/06/2017 | Silver |
| DANA PETROLEUM (INTERNATIONAL HOLDINGS) LIMITED | 02239464 | 17/01/2012 | 07/06/2017 | Dissolved |
| DANA PETROLEUM LIMITED | 03456891 | 21/03/2011 | 30/05/2017 | Amber |
| DOLPHIN DRILLING LIMITED | 01017560 | 17/11/2005 | 18/03/2011 | Amber |
| DOLPHIN DRILLING LIMITED | 01017560 | 01/05/2007 | 18/03/2011 | Amber |
| ITHACA ALPHA (N.I.) LIMITED | NI073431 | 01/02/2021 | 01/09/2022 | Silver |
| ITHACA CAUSEWAY LIMITED | 06167799 | 01/02/2021 | 01/09/2022 | Not Trading |
| ITHACA DORSET LIMITED | 01135213 | 01/02/2021 | 01/09/2022 | Not Trading |
| ITHACA ENERGY (NORTH SEA) PLC | SC595124 | 01/02/2021 | 01/09/2022 | Amber |
| ITHACA ENERGY (UK) LIMITED | SC272009 | 01/02/2021 | 01/09/2022 | Silver |
| ITHACA ENERGY DEVELOPMENTS UK LIMITED | 07105041 | 01/02/2021 | 01/09/2022 | Bronze |
| ITHACA ENERGY HOLDINGS (UK) LIMITED | SC437615 | 01/02/2021 | 01/09/2022 | Silver |
| ITHACA EPSILON LIMITED | 05979869 | 01/02/2021 | 01/09/2022 | Silver |
| ITHACA EXPLORATION LIMITED | 05914627 | 01/02/2021 | 01/09/2022 | Gold |
| ITHACA GAMMA LIMITED | 05929104 | 01/02/2021 | 01/09/2022 | Silver |
| ITHACA GSA LIMITED | FC033620 | 01/02/2021 | 01/09/2022 | One Red Flag |
| ITHACA MA LIMITED | 03947050 | 04/02/2022 | 01/09/2022 | Silver |
| ITHACA MA(NS) LIMITED | SC238015 | 04/02/2022 | 01/09/2022 | Not Trading |
| ITHACA MINERALS (NORTH SEA) LIMITED | SC274666 | 01/02/2021 | 01/09/2022 | Silver |
| ITHACA OIL AND GAS LIMITED | 01546623 | 01/02/2021 | 01/09/2022 | Amber |
| ITHACA PETROLEUM LIMITED | 05223667 | 01/02/2021 | 01/09/2022 | Silver |
| ITHACA SP (HOLDINGS) LIMITED | 09102478 | 30/06/2022 | 01/09/2022 | Amber |
| ITHACA SP BONDS PLC | 11029537 | 30/06/2022 | 01/09/2022 | Silver |
| ITHACA SP E&P LIMITED | 01504603 | 30/06/2022 | 01/09/2022 | Silver |
| ITHACA SP FINANCE LIMITED | 09102885 | 30/06/2022 | 01/09/2022 | Amber |
| ITHACA SP O&G LIMITED | 09858988 | 30/06/2022 | 01/09/2022 | Amber |
| ITHACA SP UK LIMITED | 02586927 | 01/02/2021 | 01/09/2022 | Not Trading |
| ITHACA SPE LIMITED | 09103084 | 30/06/2022 | 01/09/2022 | Gold |
| ITHACA ZETA LIMITED | 08860426 | 30/06/2022 | 01/09/2022 | Gold |
| REPSOL PENSION AND LIFE SCHEME LIMITED | 03678507 | 01/03/2018 | 11/01/2021 | Not Trading |