| UK Company Name | Partial Address |
| O'Prey Developments Limited | KIRCUBBIN, NEWTOWNARDS |
| O-Perspective Ltd | LINCOLN |
| O. P. L. Limited | HARROW, MIDDLESEX |
| O.P. Catering Limited | CROYDON, SURREY |
| O.P. Chocolate Limited | DOWLAIS, MERTHYR TYDFIL |
| O.P.D Limited | TORQUAY |
| Opal Contracts (U.K.) Limited | SOLIHULL, WEST MIDLANDS |
| Opal Food Processing Systems Limited | ST IVES, CAMBRIDGESHIRE |
| Opaltec International Limited | AVONMOUTH, BRISTOL |
| Opatra Limited | WINDSOR AVENUE, LONDON |
| Opcare Limited | ABINGDON, OXFORDSHIRE |
| Opd Group Limited | Broxbourne, Hertfordshire |
| Opd Laboratories Limited | 54-60 Baker Street, London |
| Opecprime Development Limited | OAKLEIGH ROAD SOUTH, LONDON |
| Opecprime Limited | OAKLEIGH ROAD SOUTH, LONDON |
| Opecprime Properties Limited | OAKLEIGH ROAD SOUTH, LONDON |
| Open Book Consulting Ltd | LONDON |
| Open College Network Northern Ireland | Unit 5, Belfast |
| Open Credo Limited | 15 FINSBURY CIRCUS, LONDON |
| Open Design Systems Ltd | NEWARK, NOTTS |
| Open Destinations Limited | 7 WENLOCK ROAD, LONDON |
| Open Door Communications Ltd | HASTINGS |
| Open Door Consultants Limited | SOUTHEND ON SEA, ESSEX |
| Open Fibre Networks (Wholesale) Limited | WOOLPIT, BURY ST. EDMUNDS |
| Open G I Limited | WARNDON, WORCESTER |
| Open Gi London Limited | WORCESTER, WORCESTERSHIRE |
| Open Golf And Leisure Limited | BOLTON, LANCASHIRE |
| Open Health Communications Llp | 10TH FLOOR, LONDON |
| Open House Festival Limited | 16 QUAY STREET, BANGOR |
| Open House Trust Limited | Enniskillen, Co. Fermanagh |
| Open Insurance Services Uk Limited | 91 WIMPOLE STREET, LONDON |
| Open International Limited | WARNDON, WORCESTER |
| Open Retail Solutions Limited | BEESTON, NOTTINGHAM |
| Open Seas (Uk) Limited | EAST HANNEY, OXFORDSHIRE |
| Open Text Uk Limited | READING, BERKSHIRE |
| Openbet Limited | 566 CHISWICK HIGH ROAD, LONDON |
| Opencontact Limited | SURREY STREET, NORWICH |
| Opencorporates Ltd | CORNWALL AVENUE, LONDON |
| Opendoor Print Limited | BASINGSTOKE, HAMPSHIRE |
| Openfolde Limited | Belfast |
| Openlink Software (Uk) Limited | PURLEY WAY, CROYDON |
| Openmarket Limited | London |
| Openside 777 Ltd | TARPORLEY, CHESHIRE |
| Opensite Contracts Limited | SOUTHEND ON SEA, ESSEX |
| Openslot Property Management Limited | SEVENOAKS |
| Opentable International Limited | 14-18 FINSBURY SQUARE, LONDON |
| Opentable Uk Holding Limited | 14-18 FINSBURY SQUARE, LONDON |
| Openwork Limited | LYDIARD FIELDS, SWINDON |
| Openwork Partnership Llp | Lydiard Fields, Swindon |
| Operation Europe Limited | 45 BEAVOR LANE, LONDON |
| Operational Agility Ltd. | LONDON, LONDON |
| Operational Excellence (Opex) Group Ltd | 6TH FLOOR, EDINBURGH |
| Operator Training Services Limited | ASHFORD, KENT |
| Operis Construction Ltd | 55 LUDGATE HILL, LONDON |
| Opex Corporation | NEW JERSEY 08057, USA |
| Opg Ltd. | LESMAHAGOW, LANARKSHIRE |
| Opico Limited | BOURNE, LINCOLNSHIRE |
| Opl Hollowcore Limited | WEATING, NORFOLK |
| Oplan Office Furniture Limited | Almondsbury, Bristol |
| Oplo Group Ltd | SIR FRANK WHITTLE WAY, BLACKPOOL |
| Opm (Labels & Packaging) Group Limited | 55 GELDERD ROAD, LEEDS |
| Opm Group Limited | 55 GELDERD ROAD, LEEDS |
| Opm International Ltd | BURY, LANCASHIRE |
| Opm Limited | LITTLEHAMPTON, SUSSEX |
| Opodo Limited | LONDON |
| Oponeo.Co.Uk Ltd | EALING BROADWAY, LONDON |
| Opos Limited | DUMBARTON |
| Oppenheimer Europe Ltd. | 125 Wood Street, London |
| Opportune Limited | BOLTON, GREATER MANCHESTER |
| Opportunitas Limited | 36 - 38 WIGMORE STREET, LONDON |
| Oppulant Ltd | GLOUCESTER, GLOUCESTERSHIRE |
| Oprema Limited | St Mellons, Cardiff |
| Opro International Limited | LONDON |
| Opro Limited | LONDON |
| Opso Limited | BOSTON ROAD, LONDON |
| Opt Tech (Uk) Limited | CROYDON |
| Optal Financial Limited | LONDON |
| Optare Plc | Rotherham, South Yorkshire |
| Optelec Limited | QUARRY HILL INDUSTRIAL ESTATE, ILKESTON |
| Opteven Holdings Uk Ltd | THAME, OXFORDSHIRE |
| Opti-Fuel Ltd | ST. PAULS ROAD, SHIPLEY |
| Optical Express (Holdings) Limited | GLASGOW |
| Optical Express (Westfield) Limited | GLASGOW |
| Optical Express Limited | GLASGOW |
| Optical Sciences Limited | CLAYFIELD CLOSE, NORTHAMPTON |
| Optical Services & Sales Limited | NEWPORT, GWENT |
| Optical Test And Calibration Limited | Bradford, West Yorkshire |
| Opticare Solutions Limited | Meridian Business Park, Leicester |
| Opticore It Ltd | 18 BEVIS MARKS, LONDON |
| Optigene Limited | HORSHAM, WEST SUSSEX |
| Optilase (Uk) Limited | BELFAST |
| Optilight Limited | HUNTINGDON, CAMBRIDGESHIRE |
| Optima Care Limited | 1 Waldegrave Road, Teddington |
| Optima Health (Birmingham) Limited | 2 HAYLAND STREET, SHEFFIELD |
| Optimal Technologies Limited | LETCHWORTH GARDEN CITY, HERTFORDSHIRE |
| Optimas Oe Solutions Ltd | WATERWELLS DRIVE, GLOUCESTER |
| Optimax (Uk) Limited | ALVECHURCH, WORCESTERSHIRE |
| Optimise Systems Ltd | COLLINGHAM, NEWARK |
| Optimity Limited | London |
| Optimo Research Ltd | LONDON |
| Optimold Limited | Golborne, Warrington |
| Optimor Limited | London |
| Optimum Heating Limited | CHIVENOR BUSINESS PARK, BARNSTAPLE |
| Optimum Nutrition Emea Limited | ABERDEEN, SCOTLAND |
| Optimum.Aero Limited | FORD, ARUNDEL |
| Optimum4 Limited | 100 WELLINGTON STREET, LEEDS |
| Optimus Cards Uk Limited | 27/28 Eastcastle Street, London |
| Optimus Flowers Limited | SOUTHAMPTON, HAMPSHIRE |
| Optimus Medical Limited | RETFORD, NOTTINGHAMSHIRE |
| Optio Systems Limited | Derby Road, Nottingham |
| Options Management Limited | NEWCASTLE, STAFFORDSHIRE |
| Options Resourcing Sussex Llp | 2-6 SHIRLEY ROAD, SOUTHAMPTON |
| Options Technology Limited | ST. JAMES'S, LONDON |
| Optisoft Ltd | YORK, NORTH YORKSHIRE |
| Optiva Securities Limited | London |
| Optivia Limited | MOLD, FLINTSHIRE |
| Optivite Limited | WORKSOP, NOTTINGHAMSHIRE |
| Optos Public Limited Company | Dunfermline, Fife |
| Optum Global Ltd | BALBY, DONCASTER |
| Optum Health Solutions (Uk) Limited | Marlow, Buckinghamshire |
| Optum Solutions Uk Holdings Limited | MARLOW, BUCKINGHAMSHIRE |
| Optune Homes Limited | Blackpool, Lancashire |
| Opulence Executive Travel Limited | BRADFORD, WEST YORKSHIRE |
| Opulent Trading Limited | MAYFAIR, LONDON |
| Opus Contracts Limited | SPONDON, DERBY |
| Opus Energy Group Limited | SELBY, NORTH YORKSHIRE |
| Opus Energy Limited | SELBY, NORTH YORKSHIRE |
| Opus Group Holdings Limited | Chippenham, Wiltshire |
| Opus Healthcare Ltd. | Chippenham, Wiltshire |
| Opus Limited | ENNISKILLEN, FERMANAGH |
| Opus Music Community Interest Company | BLACKWELL, ALFRETON |
| Opus Retail Solutions Limited | Belfast, Co. Antrim |
| Opus Technologies Limited | Hankey Place, London |
| Opus-Uk Limited | CHARLOTTE STREET, MANCHESTER |