| UK Company Name | Partial Address |
| O'Neill & Brennan Site Services Limited | LYDNEY, GLOUCESTERSHIRE |
| O'Neill And Brennan Construction Limited | LYDNEY, GLOS |
| O'Neill Bros. Master Joiners Ltd | PENNYBURN INDUSTRIAL ESTATE, DERRY |
| O'Neill Bros.Limited | WEST HENDON, LONDON |
| O'Neill Building Services Ltd | NORTHOLT, MIDDLESEX |
| O'Neill Concrete Flooring Ltd | OMAGH, UNITED KINGDOM (+44) |
| O'Neill Mechanical & Electrical Services Limited | DROMORE, CO TYRONE |
| O'Neill Of Clonoe Limited | COALISLAND, CO TYRONE |
| O'Neill Paving Ltd | OMAGH, CO. TYRONE |
| O'Neill Proweld Limited | 35 CLARENDON STREET, LONDONDERRY |
| O'Neill Racing Ltd | NEWBURY, BERKSHIRE |
| O'Neill Transport Limited | STRABANE |
| O'Neill'S Caravan Sales & Distributors Limited | Portstewart |
| O'Neills Irish International Sports Company Limited | STRABANE, CO TYRONE |
| On A Roll Sandwich Company Limited | MIDDLESBROUGH, CLEVELAND |
| On Air Dining Limited | Banstead, Surrey |
| On Board Training & Consultancy Ltd | 26 Linenhall Street, Belfast |
| On Equal Terms Limited | LONDON |
| On Foot Limited | Salisbury, Wiltshire |
| On Premises Laundry Limited | HARROW, MIDDLESEX |
| On Semiconductor Limited | LONDON |
| On Target Scaffolding Limited | Morecambe, Lancashire |
| On The Beach Limited | MANCHESTER |
| On The Hoof Limited | 282 Chase Road, London |
| On The Money Group Ltd | SOUTHEND-ON-SEA, ESSEX |
| On The Shore Limited | Porthmadog, Gwynedd |
| On The Sixth Day Of January Ltd | Abingdon, Oxfordshire |
| On The Spot Cleaning Limited | LONDON |
| On Web Consulting Ltd | BOLTON |
| On Yer Bike Limited | Westcott, Aylesbury |
| On-Line Partnership Group Limited | Horsham, West Sussex |
| On-Site Limited | CRAWLEY, WEST SUSSEX |
| On-Trend London Ltd | London |
| Onafriq Uk Limited | LONDON |
| Onatco Properties Company Limited | BELFAST |
| Onb Contracts Limited | Randalstown, Antrim |
| Onboard Staffing Solutions Ltd. | PORTSTEWART |
| Oncacare (U.K.) Limited | Reading, Berkshire |
| Oncampus London Limited | Cambridge |
| Once Upon A Time In London Ltd | BARNET, HERTFORDSHIRE |
| Once Upon A Time Marketing Limited | CLERKENWELL, LONDON |
| Once Upon A Time Media Limited | CLERKENWELL, LONDON |
| Oncologica Uk Limited | King's Lynn, Norfolk |
| Oncore Ltd | LONDON, LONDON |
| Ondagrass Football Scouting Network Limited | BRAY, MAIDENHEAD |
| Ondeo Industrial Solutions Uk Limited | ALTRINCHAM, CHESHIRE |
| Ondra Llp | LONDON |
| One Aldwych Limited | YORK LANE, ST. HELIER |
| One And All Wealth Management Ltd | CHEADLE, GREATER MANCHESTER |
| One Avenue Acquisitions Limited | BRENTWOOD, ESSEX |
| One Base Media Limited | LEIGH ON SEA, ESSEX |
| One Broker (Cambridge) Ltd | ST ANDREWS BUSINESS PARK, NORWICH |
| One Click Accountant Ltd | 186 ST ALBANS ROAD, WATFORD |
| One Digital Card Ltd | 1 FORE STREET, LONDON |
| One Digital Image Limited | HEXHAM, NORTHUMBERLAND |
| One Digital Limited | ASHTON, NORTHAMPTON |
| One Education Limited | Moss Lane East, Manchester |
| One Electrical Ltd | STRETFORD, MANCHESTER |
| One Eyed Dog Films Limited | 5TH FLOOR, LONDON |
| One Eyed Films Limited | LONDON, GREATER LONDON |
| One Financial Adviser Ltd | Newbury, Berkshire |
| One For Fun Limited | GATEWAY OFFICE PARK, GLASGOW |
| One Frio Ni Limited | GLOUCESTER STREET, BELFAST |
| One Future Communications Limited | CALDICOT, MONMOUTHSHIRE |
| One Gateway Ltd | 13 FREELAND PARK, POOLE |
| One Holding North Limited | BATLEY, WEST YORKSHIRE |
| One Horizon Group Limited | Eastleigh, Hampshire |
| One Hundred Brand Street Limited | GLASGOW, LANARKSHIRE |
| One Little Independent Ltd | LONDON |
| One Luggage Limited | Vines Cross, East Sussex |
| One Media Ip Group Plc | Iver Heath, Bucks |
| One Money Mail Limited | London |
| One Nucleus Limited | CAMBRIDGE, CAMBRIDGESHIRE |
| One Packaging Limited | MIDDLEMARCH BUSINESS PARK, COVENTRY |
| One Photographic Ltd | Manor Trading Estate, Benfleet |
| One Plus One Marriage & Partnership Research | 2 London Wall Place, London |
| One Potato Two Potato Ltd | HIGH HOLBORN, LONDON |
| One Properties Limited | Reading, Berkshire |
| One Saracen Ltd | 259-269 Old Marylebone Road, London |
| One Signature Limited | BELFAST |
| One Sky Aviation Llp | OWMBY-BY-SPITAL, MARKET RASEN |
| One Sky Aviators Ltd | LINCOLN, LINCOLNSHIRE |
| One Stop Bikes Limited | ATTLEBOROUGH FIELDS IND ESTATE, NUNEATON |
| One Stop Couriers Limited | COLNBROOK, SLOUGH |
| One Stop Europe Ltd | FRAMPTON WEST, BOSTON |
| One Stop Finance Group Limited | Cornwall Avenue, London |
| One Stop Finance Limited | Cornwall Avenue, London |
| One Stop Stores Limited | WALSALL, WEST MIDLANDS |
| One To One Food Services Limited | Poole |
| One Unit Llp | 133 FINNIESTON STREET, GLASGOW |
| One Vision Imaging Limited | MANSFIELD ROAD, DERBY |
| One Way Resourcing Ltd | Waterlooville, Hampshire |
| One Week Driving Specialist Limited | HEATHCOTE, WARWICK |
| One World (Gb) Limited | BRADFORD, WEST YORKSHIRE |
| One-Louder Music Ltd | Barnard Castle |
| One-O-One Convenience Stores Limited | 70 HAMILTON DRIVE, GLASGOW |
| One-Stop Finance (Uk) Ltd | BIRMINGHAM |
| One-Ticket Limited | 58 Morrison Street, Edinburgh |
| One51 Es Metals (Uk) Limited | AMPTHILL, BEDFORD |
| One97 Communications Singapore Private Limited | 48-01 UOB PLAZA 1, SINGAPORE |
| Oneadvanced Group Limited | 101 WHARFSIDE STREET, BIRMINGHAM |
| Oneadvanced It Services Limited | 101 WHARFSIDE STREET, BIRMINGHAM |
| Oneadvanced Limited | 101 WHARFSIDE STREET, BIRMINGHAM |
| Oneclick Media Services Ltd | STANMORE, LONDON |
| Oneclickhr Limited | The Causeway, Staines-Upon-Thames |
| Onesavings Bank Plc | Chatham, Kent |
| Onesimus Ltd | EASTBOURNE, EAST SUSSEX |
| Onesource Virtual (Uk) Limited | Derry |
| Onestop I.T.S. Ltd. | AUCHTERLESS, TURRIFF |
| Onex Corporation L.P. | 78 MONTGOMERY STREET, EDINBURGH |
| Onfab Limited | PROSPERITY WAY, MIDDLEWICH |
| Onflight Couriers Limited | 73 CENTRAL STREET, LONDON |
| Onion Reporting Software Ltd | Cromac Square, Belfast |
| Onipos Systems Ltd | CARRYDUFF, BELFAST |
| Onjenu Ltd | SNODLAND |
| Onkey Business Ltd | Fleet, Hampshire |
| Online Clinic (Uk) Limited | 7 Tufton Street, London |
| Online Currency Corp Ltd | BRIDGE STREET, BELFAST |
| Online Estate Agent N I Ltd | Dungannon, Co Tyrone |
| Online Giving Ltd | Loughborough University Science & Enterprise Park, Loughborough |
| Online Home Retail Limited | Evesham, Worcestershire |
| Online Pc Support Limited | EASTLEIGH, HAMPSHIRE |
| Online Technology International Ltd. | TUBWELL LANE, CROWBOROUGH |
| Online Telematics Limited | LYME REGIS, DORSET |
| Only 4 U Limited | HARROW |
| Onnec Group Northern Ireland Limited | Belfast, Bt3 9bj |
| Onnec Group Uk Limited | 33 Farringdon Road, London |
| Onnec Holdings Limited | 33 FARRINGDON ROAD, LONDON |
| Onpath Energy Limited | 4 Mandarin Road, Houghton-Le-Spring |
| Onshore Energy Limited | London |
| Onsite Central Limited | WALSALL, WEST MIDLANDS |
| Onsite Hire Limited | BURY ST. EDMUNDS, SUFFOLK |
| Onsite Specialist Maintenance Limited | WALSALL, WEST MIDLANDS |
| Onske Interiors Limited | Covent Garden, London |
| Onslow Fitzroy Limited | 25 WALBROOK, LONDON |
| Onslow Gipping Limited | 25 WALBROOK, LONDON |
| Onslow Suffolk Limited | 25 Walbrook, London |
| Ontario Acquisitions Fx Inter Limited | 361 Oxford Street, London |
| Ontario Teachers' Pension Plan Board | TORONTO, ONTARIO M2M 4H5 |
| Ontel Ltd | Camberley |
| Ontex Healthcare Uk Limited | CORBY, NORTHAMPTONSHIRE |
| Onto Innovation Europe B.V. | DEN HAAG, 2491ACC |
| Ontology-Partners Limited | School Lane, Chandlers Ford |
| Onus (Ni) Limited | Cullybackey Road, Ballymena |
| Onwave Uk Limited | KINGS HILL, WEST MALLING |
| Onyx Concept Bespoke Automotive Limited | London |
| Onyx Group Limited | PRIORS WAY, MAIDENHEAD |
| Onyx Information Technology Holdings Limited | PRIORS WAY, MAIDENHEAD |
| Onyx Insurance Brokers Limited | 65 FENCHURCH STREET, LONDON |
| Onyx Scientific Limited | Sunderland, Tyne And Wear |