- Ogam Igam - 5 Royal Buildings, Penarth, South Glamorgan, CF64 3EB
- Ogar Consulting Ltd - New Bond House, London, Greater London, W1S 1DX
- Ogar Technology - Suite 7, London, Greater London, SE1 7TL
- Ogden Electrical Services Ltd - 233 Willingdon Road, Eastbourne, East Sussex, bn209jp
- Ogden Fibres - Becks Mill, Keighley, West Yorkshire, BD21 1SD
- Ogden Safety Systems - Unit 6 Cliffe Park Way, Bruntcliffe Road, Leeds, West Yorkshire, LS27 0RY
- Ogier Electronics Ltd - Unit 12-13, Sandridge Park, St Albans, Hertfordshire, AL3 6PH
- Ogle Models & Prototypes Ltd - Birds Hill, Letchworth Garden City, Hertfordshire, SG6 1JA
- O'Gormans Ltd - 69 Sheep Street, Bicester, Oxfordshire, OX26 6JW
- OGP Uk - Faraday House, Derby, Derbyshire, DE65 5BU
- O'Hagan's Ltd - 71 Fishbourne Road West, Chichester, West Sussex, PO19 3JJ
- Ohes - 1 The Courtyard, Denmark Street, Wokingham, Berkshire, RG40 2AZ
- OhmEx Industrielle Elektrowärme GmbH - Industriering 7, Großwallstadt, D-63868
- Ohmex Instruments - 9 Gordleton Industrial Estate, Hannah Way, Lymington, Hampshire, SO41 8JD
- Ohms Security Ltd - 84 High Road, West Byfleet, Surrey, KT14 7QW
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