Company Index
- O C T A Ltd - Northwood
- O M I Monitor Services - Stevenage
- O.C.S. Consulting Plc - Borehamwood
- Oakbridge Services Ltd - Warminster
- Oakcad Ltd - Bletchley
- Oakhurst Business Systems Ltd - Hassocks
- Oakland Associates Ltd - Sutton
- Oakleaf Consultancy Ltd - Northampton
- Oakridge I.T. Ltd - Bristol
- Oakridge Internet Ltd - Birkenhead
- Oaksmere Refrigeration Design & Consultancy Ltd - Stowmarket
- Oaktree Executive Ltd - Yateley
- Oakwood Business Systems Ltd - Royston
- Oasis Ltd - Slough
- Oast House Media Ltd - Deal
- Oasys Ltd - London
- Objective Computing Ltd - Basildon
- Objective Results Ltd - Reading
- Objective Services Ltd - Aldershot
- Observatory Sciences Ltd - Cambridge
- Obsideo Technologies Ltd - Dorchester
- Occ Computer Personnel (Northern) Ltd - Nantwich
- Ocean Systems Ltd - Fleet
- Oceanview Consultancy Ltd - Sandwich
- OCM Business Systems Ltd - Pershore
- Octagon Communications Ltd - Ashton in Makerfield
- Odessa Corporate Services - Edinburgh
- Odyssey Technologies Ltd - Farnham
- OEM Computer Systems Ltd - Rugby
- Office Clear Uk - Tunbridge Wells
- Office Support Ltd - Hereford
- Offtek Ltd - Solihull
- Oggle Ltd - Milton Keynes
- Ohgon Electronics - Canvey Island
- Oilandgasjobsearchcom Ltd - Stockport
- OKI Europe Ltd - Egham
- Old Orchard IT - Calne
- Olive Solutions - Manchester
- OMEGA Ltd - Burgess Hill
- Omega Research Ltd - Ely
- Omega Selection Services - Stonehouse
- Omicron Electronics UK Ltd - Stafford
- Omitec Resources - Coventry
- Omni Direction (Uk) Ltd. - Derby
- Omniplex Ltd - Berkhamsted
- On Air Telecom Ltd - Manchester
- On Line IT Ltd/ Jetset online - Hitchin
- ONC Computers - Jarrow
- Onclick Ltd - Tonbridge
- One Degree Consulting Ltd - Romford
- One Way Circuits Ltd - Norwich
- Ones and Zeros - Leicester
- Onesys - York
- Onionsoft Ltd - Swadlincote
- Online Systems UK Ltd - Nottingham
- Ontech Solutions Ltd (formerly Blockmate Computing Ltd) - Tilbury
- Ontraq Ltd - Chelmsford
- OpalTec International Ltd - Bristol
- Opas IT Ltd - London
- Open Business Systems Ltd. - London
- Open Consultancy Network Ltd - Avonmouth
- Open File - Lewes
- Open Minds High Availability Solutions - Sutton Coldfield
- Open Seas (U K) Ltd - Abingdon
- OpenAir - Crewe
- Openda Ltd - Swindon
- Openhouse Europe Ltd - Newcastle under Lyme
- Openlink Group Ltd - Croydon
- Openxtra Ltd - Otley
- Operations Support (Software) Ltd - Cranleigh
- Opin Systems Ltd - Glasgow
- Opsol UK Ltd - Cramlington
- Optech Fibres Ltd - Barrow in Furness
- Opticon Ltd - Luton
- Optima Design Associates Ltd - Mansfield
- Optima Global Solutions Ltd - Milton Keynes
- Optima Research Ltd - Stansted
- Optima Warehouse Solutions Ltd - Crewe
- Optimize Search Engine Marketing - London
- Optimum Connections Ltd - Wokingham
- Optimus Uk Ltd - Kenilworth
- Optoma Europe Ltd - Watford
- Oracle Corporation UK Ltd - Cheadle (Cheshire)
- Oracle Corporation UK Ltd - Edinburgh
- Oracle Corporation UK Ltd - Reading
- Oraica Ltd - Wrexham
- Orangeleaf Systems Ltd - Shrewsbury
- Orbis Software Ltd - Poole
- Orbit Research Ltd - Bradford
- Orbital Epos Systems Ltd - Warminster
- Orca Logic Ltd - Dorking
- Orchard Computer Services - Bristol
- Orchard Professional Computer Services Ltd - Mitcheldean
- Oriium Consulting Ltd - Harrogate
- Orion Engineering Ltd - Nantwich
- Orion Media Marketing Ltd - Brentford
- Orion Projects Ltd - Saltash
- Orion Resourcing Ltd - Aylesbury
- Orion Systems Ltd - Ashby de la Zouch
- Oscar Kilo Ltd - Bideford
- Oscil Technology Consultants - London
- Osco Ltd - Bletchley
- Oscura Ltd - Reading
- OSEC-IT Services Ltd - Caerphilly
- Osnet Ltd - Wokingham
- OTC Ltd - Edinburgh
- Outbound Field Marketing Services Ltd - Reading
- OuterArc Ltd - Nottingham
- Outline Web Solutions Ltd - Camberley
- Owen Mumford Ltd - Oxford
- Oxbridge Monitoring Ltd - Banbury
- Oxford Computer Consultants Ltd - Oxford
- Oxford Macintosh Solutions Ltd - Witney
- Oyster Technology - Lincoln
- Oyster Terminals Uk Ltd - Coventry
- Ozoid Small Business Services - Dagenham
