| UK Company Name | Partial Address |
| O S S Limited | GULVAL, PENZANCE |
| O'Shaughnessy Bros.Limited | HUDDERSFIELD, W.YORKS |
| O'Sullivan Plant Hire Ltd. | KINGSBURY, LONDON |
| O'Sullivan Shopfitting (Cambridge) Limited | Cambridge, Cambridgeshire |
| O'Sullivans Investments Limited | 3RD FLOOR, LONDON |
| O. Seaman & Son Limited | Bury St. Edmunds, Suffolk |
| Osa Door Parts Limited | HAWKS GREEN IND ESTATE, CANNOCK |
| Osbaldwick Fisheries & Co Ltd | York, North Yorkshire |
| Osbco Limited | Corby, Northamptonshire |
| Osbon Limited | STRATFORD CENTRE, LONDON |
| Osborn Securities Limited | Croydon, Surrey |
| Osborn Transport Services Limited | LEIGHTON BUZZARD, BEDFORDSHIRE |
| Osborne & Little Group Limited | LEE ROAD, LONDON |
| Osborne & Little Limited | LEE ROAD, LONDON |
| Osborne Clarke Llp | London |
| Osborne Clarke Nominees Limited | Counterslip, Bristol |
| Osborne Energy Limited | Hastings, East Sussex |
| Osborne King & Megran Limited | 16-24 WARING STREET, BELFAST |
| Osbornes Jewellers Limited | Bedlington, Northumberland |
| Osbourne Developments Limited | LISBURN |
| Osc Ltd | BIRMINGHAM BUSINESS PARK, BIRMINGHAM |
| Osca Technology Limited | ANNESLEY, NOTTINGHAM |
| Oscar & Oscar Limited | BELFAST |
| Oscar Mayer Limited | WREXHAM INDUSTRIAL ESTATE, WREXHAM |
| Oscar Research Ltd. | TORQUAY, DEVON |
| Oscars Pizza Company Limited | Kings Langley, Herts |
| Osem U.K. Limited | LAINDON, ESSEX |
| Osg Cloud Limited | ANTRIM |
| Osg Europe Limited | BASILDON, ESSEX |
| Osgo Ltd | STALYBRIDGE, CHESHIRE |
| Osgoods Limited | Alton, Hanpshire |
| Oshkosh Aerotech Uk Limited | CARDIFF, CAERDYDD |
| Osi Food Solutions Uk Holdings Limited | Scunthorpe, North Lincolnshire |
| Osi Food Solutions Uk Limited | SCUNTHORPE, NORTH LINCOLNSHIRE |
| Osi International Holdings Limited | Scunthprpe, North Lincolnshire |
| Osiris Advisors Limited | RIPLEY, WOKING |
| Osiris Bars Limited | QUEEN STREET, BELFAST |
| Osiris Bars No.2 Limited | QUEEN STREET, BELFAST |
| Osiris Developments Ltd | FARNHAM, SURREY |
| Osiris Limited | Nottingham, Nottinghamshire |
| Osisoft (Uk) Limited | MADINGLEY ROAD, CAMBRIDGE |
| Ositech Limited | LONDON |
| Osl Financial Consultancy Ltd | Barnetby, North Lincolnshire |
| Osm (Irl) Ltd | Newry |
| Osman Property Limited | Hexham, Northumberland |
| Osmio Solutions Ltd | Fawkham, Kent |
| Osmosis (Holdings) Limited | LONDON |
| Osmosis 101 Limited | Glasgow |
| Osmosis Limited | Pewsey |
| Osmosis Promotional Products Limited | LONDON |
| Osmunda Limited | 342 REGENTS PARK ROAD, LONDON |
| Osprey (Pd156) Limited | 31 - 33 UNION GROVE, ABERDEEN |
| Osprey Acquisitions Limited | HUNTINGDON, CAMBRIDGESHIRE |
| Osprey Corporation Limited | WHITSTABLE, KENT |
| Osprey Europe Limited | Poole, Dorset |
| Osprey Holdco Limited | HUNTINGDON, CAMBRIDGESHIRE |
| Osprey Holidays (Tickets) Limited | EDINBURGH |
| Osprey Investments Limited | BELFAST, ANTRIM |
| Osprey Properties Limited | Dalgety Bay, Fife |
| Osps Trustee Limited | WELLINGTON SQUARE, OXFORD |
| Osram Limited | GELDERD ROAD, LEEDS |
| Oss Managed Services Limited | NORTHWICH, CHESHIRE |
| Ossion Limited | Belfast, County Antrim |
| Ossl Limited | OXFORD |
| Ossur Uk Holding Limited | HAMILTON ROAD, STOCKPORT |
| Ossur Uk Limited | STOCKPORT, MANCHESTER |
| Osteomed Limited | Edinburgh |
| Ostick & Williams Limited | Belfast |
| Osullivan Formwork Limited | Ascot, Berkshire |
| Osvey Limited | BELFAST |
| Oswestry Electrical & Plumbing Factors Limited | Halesowen, West Midlands |
| Óssántí Pearls Ltd | 19 THE CLOCKWORKS, LONDON |