| INTERCARABAO LIMITED | Reading | A rating |
| Intercare Community Support Ltd | Coventry | A rating |
| INTERCESSORS MINISTRIES OF GREAT BRITAIN | CATFORD | A rating |
| INTERCITY HIRE LTD | LONDON | A rating |
| Intercom Software UK Limited | London | A rating |
| Interconnect IT Ltd | Liverpool | A rating |
| Interconnector Limited | London | A rating |
| Intercontinental Foods (Scotland) Ltd Trading as Tuk Tuk Restaurant | Edinburgh | A rating |
| InterContinental Hotels Group PLC | Windsor | A rating |
| Intercorp International Ltd | London | A rating |
| InterDigital Europe Ltd | London | A rating |
| Interesba (UK) Limited | London | A rating |
| Interex Limited | London | A rating |
| Interface Accountants Ltd | Datchet | A rating |
| Interface Contract Management Limited | Stratford Upon Avon | A rating |
| Interface Developers Limited | Malvern | A rating |
| INTERFACE PROPERTIES LIMITED | Ilford | A rating |
| Interfacio Ltd | Kingston Upon Thames | A rating |
| Interfax Europe Limited | London | A rating |
| Interfields Equestrian Ltd | Malvern | A rating |
| Interfish Ltd (Reception) | PLYMOUTH | A rating |
| InterFlex Group | Edinburgh | A rating |
| Interfloor Limited | Haslingden | A rating |
| Interflora British Unit | Sleaford | A rating |
| Interfoam Limited | Kempston | A rating |
| INTERFORCE LIMITED | LONDON | A rating |
| InterGen (UK) Ltd | Edinburgh | A rating |
| Intergence Systems Ltd | Cambridge | A rating |
| InterGlobe Air Transport Limited | London | A rating |
| InterGlobe Enterprises (UK) Limited | ADDLESTONE | A rating |
| Intergraph (UK) Limited | Swindon | A rating |
| INTERGREAT EDUCATION GROUP LTD. | LONDON | A rating |
| Intergroup World Ltd | London | A rating |
| Interhaze Ltd | SOLIHULL | A rating |
| Interica Limited | Dartford | A rating |
| Interim Direct Limited t/a Thames Care | READING | A rating |
| INTERIM ENTERPRISES MANAGEMENT & CONSULTANCY SERVICES LIMITED | NOTTINGHAM | A rating |
| Interior Design Project Ltd | London | A rating |
| INTERIOR FURNITURE LTD | Surbiton | A rating |
| Interior Goods Direct Limited | Bradley | A rating |
| Interior Night Limited | London | A rating |
| INTERIOR PARTNERSHIPS LTD | KENT | A rating |
| INTERIORS BY JACKSONHEIM LTD | Manchester | A rating |
| Interiors Online Direct Limited | Castleford | A rating |
| Interiors With Art Limited | London | A rating |
| INTERKEN FREIGHTERS (UK) LTD | FELTHAM | A rating |
| Interket Limited | Macclesfield | A rating |
| Interlagos Holdings Ltd | London | A rating |
| InterLead Education Ltd | London | A rating |
| Interlink Direct Ltd | London | A rating |
| Interlink Hotels Ltd T/A The George Hotel | Pangbourne | A rating |
| Interlink Online Limited | London | A rating |
| Interlink Software Services Limited | Wilmslow | A rating |
| Interlocked Construction (Scotland) Ltd | Glasgow, Scotland | A rating |
| Interlocks Surveys Limited | Southam | A rating |
| Intermarine UK Ltd | Pontypridd | A rating |
| Intermark Corporate Services Limited | London | A rating |
| Intermed Innovations Limited | London | A rating |
| Intermedia Technologies Company Ltd | Bristol | A rating |
| Intermission Film Limited | London | A rating |
| Intermodal Tank Transport UK Ltd | Middlesbrough | A rating |
| Intermusica Artists Management Limited | London | A rating |
| Intermusica Artists' Management Ltd | London | A rating |
| Interna UK Limited | London | A rating |
| Internal Fire Museum of Power | Tanygroes | A rating |
| INTERNATIONAL ADMISSION SERVICE LTD | Ilford | A rating |
| International Aids Vaccine Initiative, Inc. (IAVI) | Whitchurch | A rating |
| International Alert | London | A rating |
| International Anjuman-e-Khuddam-ul-Sofia and Amir-e- Millat Trust Foundation | Birmingham | A rating |
| International Artist Agency Ltd | Leyland | A rating |
| International Asset Management Limited | London | A rating |
| INTERNATIONAL ASSOCIATION OF CLASSIFICATION SOCIETIES LIMITED | LONDON | A rating |
| International Association of Oil & Gas Producers | LONDON | A rating |
| International Automotive Components Group Limited | Birmingham | A rating |
| International Baccalaureate Organization (UK) Limited | Cardiff | A rating |
| International Bar Association | London | A rating |
| INTERNATIONAL BARBERS LTD | Southampton | A rating |
| International Bible Students Association | CHELMSFORD | A rating |
| International Board | Redhill | A rating |
| International Breakthrough Ministries | Leicester | A rating |
| INTERNATIONAL BRITISH ONLINE SCHOOL LTD | London | A rating |
| INTERNATIONAL BUDDHIST PROGRESS SOCIETY (UK) | LONDON | A rating |
| International Builders Estates Limited | London | A rating |
| International Business and Professional Corporation | London | A rating |
| International Capital Market Association Limited | London | A rating |
| International Cargo Logistics Limited | London | A rating |
| INTERNATIONAL CASS ACADEMY LTD | Ilford | A rating |
| International Centre of Justice for Palestinians | Maidstone | A rating |
| International China Concern | Newcastle on Tyne | A rating |
| International Committee of the Red Cross | London | A rating |
| International Community Organisaton of Sunderland (ICOS) | Sunderland | A rating |
| International Community School | London | A rating |
| International Construction Design & Management Ltd | Worcester | A rating |
| INTERNATIONAL CONSTRUCTION GROUP LTD | NORTHAMPTON | A rating |
| International Convention Centre Wales Limited | Newport | A rating |
| International Copyright Enterprise Services Limited | London | A rating |
| International Corporate Governance Network | London | A rating |
| International Council on Mining and Metals | London | A rating |
| International Creative Management Ltd | London | A rating |
| International Crisis Group | London | A rating |
| International Curators Forum | London | A rating |
| International Dance Shoes Limited | Milton Keynes | A rating |
| International Direct Packaging Ltd | St Ives | A rating |
| International Documentary Festival Sheffield | Sheffield | A rating |
| International Education and Business Solutions Limited | Birmingham | A rating |
| International Education and Poverty Relief | Manchester | A rating |
| International Education Counselling Centre | Sheffield | A rating |
| International Education Counselling Centre UK Limited | Rochdale | A rating |
| International Education Exchange Ltd | London | A rating |
| International Education Organisation Ltd | London | A rating |
| International Expos Ltd | London | A rating |
| International Federation of Health Plans | London | A rating |
| International Fellowship of Evangelical Students | Oxford | A rating |
| International Fertilizer Association Limited | London | A rating |
| International Finance Corporation, The World Bank Group | London | A rating |
| International Fire Consultants Ltd. | Princes Risborough | A rating |
| International Fish Canners Holdings | Fraserburgh | A rating |
| International Flagship Limited | Bradford | A rating |
| International Flavours & Fragrances, I.F.F. (G.B.) Ltd | Haverhill | A rating |
| INTERNATIONAL FOOD SERVICE EQUIPMENT LTD | CROYDON | A rating |
| International Food Store Ltd | Birkenhead | A rating |
| International Food Technologies Ltd | London | A rating |
| International Foods Leeds Limited | Leeds | A rating |
| INTERNATIONAL FOUNDATION FOR CHILDREN'S EDUCATION | Manchester | A rating |
| INTERNATIONAL FREIGHT LOGISTICS LTD | Oswaldtwistle | A rating |
| International General Insurance Company (UK) Limited | London | A rating |
| INTERNATIONAL GOSPEL OF TRUTH CHURCH | LONDON | A rating |
| International Gospel Outreach | Northallerton | A rating |
| International Grace of God Church | London | A rating |
| INTERNATIONAL GROCERS (LEEDS) LTD | Leeds | A rating |
| International Group Of Education Ltd | London | A rating |
| International Health Partners (UK) Limited | London | A rating |
| International Hospitals Group | Gerrards Cross | A rating |
| International House Belfast Ltd | Belfast | A rating |
| International House Newcastle | Newcastle upon Tyne | A rating |
| International House Trust Limited (t/a International House London) | London | A rating |
| International Hydropower Association | London | A rating |
| INTERNATIONAL INDEPENDENT SCHOOLS AUTHORITY LIMITED | HOVE | A rating |
| International Institute for Anti - Ageing | London | A rating |
| International Institute for Environment and Development | London | A rating |
| International Justice Mission UK | London | A rating |
| International Lawyers Project | London | A rating |
| International League of Dermatological Societies | London | A rating |
| International Learning Movement (ILM) | Blackburn | A rating |
| International Live Music Conference Limited | London | A rating |
| International Location Safety Limited | Haywards Heath | A rating |
| International Logistics Group Limited | Burgess Hill | A rating |
| International Longevity Centre UK | London | A rating |
| International Luxury Hotels Limited t/a The Bentley Hotel | London | A rating |
| International Management Group (UK) Limited | London | A rating |
| International Management Group (UK) Limited - Fashion Representation | London | A rating |
| International Marine Survey Limited | Little Ouseburn | A rating |
| International Medical Corps (UK) | London | A rating |
| International Medical Group Limited | Cardiff | A rating |
| International Metallurgical Resources Limited | London | A rating |
| International Model Management Ltd | London | A rating |
| INTERNATIONAL NETWORK FOR TRADITIONAL BUILDING ARCHITECTURE & URBANISM (UK) | London | A rating |
| International Network of People who Use Drugs | London | A rating |
| International Niemann Pick Disease Registry | Sunderland | A rating |
| International Nuclear Services Ltd. | Warrington | A rating |
| International Organisation for Peace Building and Social Justice (PSJ) UK LTD | Hounslow | A rating |
| International Paint Limited | Gateshead | A rating |
| INTERNATIONAL PAINT SUPPLIERS | LEICESTER | A rating |
| International Passenger Protection Limited | West Wickham | A rating |
| International PEN | London | A rating |
| International Personal Finance Plc | Leeds | A rating |
| International Pheromone Systems (IPS) Ltd | Neston | A rating |
| International Planned Parenthood Federation | London | A rating |
| International Plywood (Gloucester) Limited | Stonehouse | A rating |
| International Power and Marine Group Limited | Burton on Trent | A rating |
| INTERNATIONAL POWER Ltd. | London | A rating |
| International Praise Centre | London | A rating |
| International Procurement & Logistics Limited | Wakefield | A rating |
| International Professional Risks Europe - UK Branch | London | A rating |
| INTERNATIONAL QUALIFICATIONS AND CERTIFICATIONS ASSESSMENT BOARD LTD | Kensington, London | A rating |
| INTERNATIONAL QUALIFICATIONS BOARD LTD | London | A rating |
| INTERNATIONAL REAL ESTATE INVESTMENT SOLUTIONS LTD | London | A rating |
| INTERNATIONAL RECRUITMENT SOLUTIONS LIMITED | London | A rating |
| International Registries (UK) Ltd | London | A rating |
| International Rescue Committee UK | London | A rating |
| International Residential Media Limited | London | A rating |
| International Road Assessment Programme | Bracknell | A rating |
| INTERNATIONAL ROOMS LIMITED | Harrow | A rating |
| International School of Creative Arts | Ascot | A rating |
| International School of London | London | A rating |
| International School of Veterinary Postgraduate Studies Limited | Swindon | A rating |
| International Seismological Centre | Thatcham | A rating |
| International Service Fellowship Trust | Birmingham | A rating |
| International Shared Services Limited | London | A rating |
| INTERNATIONAL SIDDHASHRAM SHAKTI CENTRE | HARROW-WEALD | A rating |
| International Society for Krishna Consciousness (ISKCON) | Aldenham, Watford | A rating |
| International Society for Krishna Consciousness London | London | A rating |
| International Society of Substance Use Prevention and Treatment Professionals | London | A rating |
| International SOS Assistance Limited | London | A rating |
| International SOS GS Limited | London | A rating |
| International Sports Federation for Athletes with an Intellectual Impairment | Sheffield | A rating |
| International Students House | London | A rating |
| International Sustainable Forestry Coalition | Edinburgh | A rating |
| International Swaps and Derivatives Association, Inc | LONDON | A rating |
| International Teams UK Trust Ltd | Corfe Mullen, Wimborne | A rating |