| UK Company Name | Partial Address |
| A O It Consultancy Services Limited | ILFORD, ESSEX |
| A One Tyres (Dromore) Ltd | Dromore, County Down |
| A-One Shuttering Limited | DUNGANNON, CO TYRONE |
| A.O. Locum Services Limited | ILFORD, ESSEX |
| A.One Feed Supplements Limited | THIRSK, NORTH YORKSHIRE |
| Ao Mobile Limited | LOSTOCK, BOLTON |
| Ao Retail Limited | LOSTOCK, BOLTON |
| Aob Advisory Limited | BELFAST |
| Aoc Architecture Limited | 8 Andrews Road, London |
| Aoc Holdings Limited | LOANHEAD, MIDLOTHIAN |
| Aoc Investments Limited | ECCLES, MANCHESTER |
| Aog Finance Limited | LONDON |
| Aoifemay Limited | Hertford, Hertfordshire |
| Aom International Ltd | ALPERTON LANE, WEMBLEY |
| Aon Assessment (Uk) Limited | 122 LEADENHALL STREET, LONDON |
| Aon Consulting Limited | FARNBOROUGH, HAMPSHIRE |
| Aon Global Limited | 122 LEADENHALL STREET, LONDON |
| Aon Investments Limited | 122 LEADENHALL STREET, LONDON |
| Aon Pension Trustees Limited | 122 LEADENHALL STREET, LONDON |
| Aon Solutions Uk Limited | 122 LEADENHALL STREET, LONDON |
| Aon Travel Limited | SHIFNAL, SHROPSHIRE |
| Aon Uk Group Limited | 122 LEADENHALL STREET, LONDON |
| Aon Uk Holdings Intermediaries Limited | 122 LEADENHALL STREET, LONDON |
| Aon Uk Holdings Limited | 122 LEADENHALL STREET, LONDON |
| Aon Uk Limited | 122 LEADENHALL STREET, LONDON |
| Aonghusa Ventures Ltd. | BELFAST |
| Aopa Limited | KEMSING, SEVENOAKS |
| Aos Limited | COPPULL, CHORLEY |