At 2 February 2008, Signet had the following subsidiary undertakings carrying on businesses which principally affected the profits and assets of the Group. They have the same year end date as Signet and the Company.
| Principal activity | Country of incorporation or registration | Percentage shareholdings | |
| Ernest Jones Limited | Retail jeweller | UK | 100 per cent |
| H. Samuel Limited | Retail jeweller | UK | 100 per cent |
| Leslie Davies Limited | Retail jeweller | UK | 100 per cent |
| Signet Trading Limited | Service company | UK | 100 per cent |
| Sterling Inc. | Retail jeweller | US | 100 per cent |
| Sterling Jewelers Inc. | Retail jeweller | US | 100 per cent |
| Sterling Jewelers LLC | Retail jeweller | US | 100 per cent |
| Sterling of Ohio Inc. | Retail jeweller | US | 100 per cent |
| Signet Holdings Limited | Holding company | UK | 100 per cent |
| Signet US Holdings, Inc. | Holding company | US | 100 per cent |
| Checkbury Limited | Property holdingcompany | UK | 100 per cent |
| Signet Sourcing Limited | Diamond sourcing | UK | 100 per cent |
A chart summarising the Group structure is provided at Section 3 (Organisational Structure) of Part XII of this document.