| Conquip Engineering Group | Alton | A rating |
| Conrad Darare Ltd t/a Prosdokia | Hayes | A rating |
| Conrad Energy Limited | Abingdon | A rating |
| Conrads Building Contractors Limited | Nottingham | A rating |
| Conran and Partners Ltd | London | A rating |
| Conro Electronics Ltd | Pitstone | A rating |
| Conroy Baker Ltd. | Hull | A rating |
| Consarc Design Group Ltd. | Belfast | A rating |
| Consarc Engineering Ltd | Holytown | A rating |
| Conscia Group UK Ltd | Portsmouth | A rating |
| Conscious Catering Limited | Maidenhead | A rating |
| Conscium Ltd | London | A rating |
| Conseb Services Limited | Milton Keynes | A rating |
| Consensus Support Services Limited | Colchester | A rating |
| ConsenSys Systems UK Limited | Nether Alderley | A rating |
| Consertus UK Ltd | London | A rating |
| Conservation Collective | Andover | A rating |
| Conservation International UK | London | A rating |
| CONSERVE ENGINEERING SOLUTIONS UK LTD | Liverpool | A rating |
| Consett and District Cricket Club | Consett | A rating |
| CONSETT FOOD AND WINE LTD | Consett | A rating |
| Consett Medical Centre | Consett | A rating |
| CONSIDER CARE LIMITED | Cirencester | A rating |
| Consider Creative Ltd | London | A rating |
| Consider Solutions Ltd | London | A rating |
| CONSIDERATE HOME CARE LTD | London | A rating |
| Considerate Hoteliers Limited | London | A rating |
| Consigned Sealed Delivered LTD | LONDON | A rating |
| Consilient Health Limited | Richmond upon Thames | A rating |
| Consilio Global (UK) Limited | London | A rating |
| Consilium | London | A rating |
| Consilium Accountancy Group Limited | GLASGOW | A rating |
| Consilium Contracting Services | Paisley | A rating |
| Consilium Strategic Communications Ltd | London | A rating |
| CONSILIUMXCEL LIMITED | London | A rating |
| CONSILIVM LIMITED | London | A rating |
| Consillion (UK) Limited | Wokingham | A rating |
| Consinst Limited | Glasgow | A rating |
| Consleague Consulting Ltd | London | A rating |
| Consolata Fathers | London | A rating |
| Consolidated Contractors International (UK) Ltd | London | A rating |
| Consolidated Holdings Limited | London | A rating |
| Consolidated Logistics Services Limited | Slough | A rating |
| Consolidated Minerals Limited | London | A rating |
| Consolidated Mining and Investments Limited | Ascot | A rating |
| CONSOLIDIS LIMITED | Huddersfield | A rating |
| Consortium Maritime Trading Ltd | Bicester | A rating |
| Constable Country Medical Practice | Colchester | A rating |
| Constance Cars Ltd | London | A rating |
| Constant Air Systems Ltd | High Wycombe | A rating |
| CONSTANT DEVELOPMENT LTD | London | A rating |
| Constant Healthcare | Huddersfield | A rating |
| Constantia FFP Ltd | Northampton | A rating |
| Constantia Healthcare Limited | Beverley | A rating |
| Constantia Wealth & Finance | London | A rating |
| Constantin | London | A rating |
| Constantine Limited | London | A rating |
| Constantinople Bistro LtD | brighton | A rating |
| Constellation Cold Logistics Holdings Limited | London | A rating |
| Constellation Education Services | Bristol | A rating |
| CONSTELLATION GENERATION LIMITED | LONDON | A rating |
| Constellation Global Limited | London | A rating |
| CONSTELLATION TECHNOLOGY SERVICES LTD | Milton Keynes | A rating |
| Constellia | Nottingham | A rating |
| Constellium UK Limited | Uxbridge | A rating |
| Constor Solutions Limited | London | A rating |
| CONSTRADA LTD | STOCKPORT | A rating |
| Construct Enterprises Ltd | LONDON | A rating |
| Construct London Limited | London | A rating |
| Constructex Ltd | Fareham | A rating |
| Construction & Property Recruitment Ltd | Edinburgh | A rating |
| Construction & Property Solutions Limited | Manchester | A rating |
| CONSTRUCTION 5 LTD. | Leicester | A rating |
| Construction and Letting Limited | London | A rating |
| Construction Development Centre Ltd | Hemel Hempstead | A rating |
| Construction Fixings Systems Ltd | Marlow | A rating |
| CONSTRUCTION FOR GENERATIONS LIMITED | Wisbech | A rating |
| Construction Helpline Ltd | London | A rating |
| Construction Industry Training Board (CITB) | Peterborough | A rating |
| Construction Industry Trust for Youth | London | A rating |
| Construction Link Limited | London | A rating |
| Construction Logistics Group Ltd | London | A rating |
| Construction Logistics Services Limited | London | A rating |
| Construction Management Consulting Limited | Dartford | A rating |
| Construction Marine Limited | Leeds | A rating |
| CONSTRUCTION PERFECTIONIST LTD | London | A rating |
| Construction Plant Installations Limited | Cambridge | A rating |
| CONSTRUCTION POINT LIMITED | Manchester | A rating |
| Construction Skills Certification Scheme Limited | London | A rating |
| Construction Specialties ( U.K.) Limited | Aylesbury | A rating |
| Construction Surge Ltd | London | A rating |
| ConstructionCrew Ltd | Wigan | A rating |
| Constructionize Construction Company Ltd | Walsall | A rating |
| CONSTRUCTIONS 4 ALL LTD | Bradford | A rating |
| CONSTRUCTIONS R US LTD | Northwood | A rating |
| Constructions Techniques Limited | Chorley | A rating |
| Constructive Biology Limited | London | A rating |
| CONSTRUCTIVE THINKING STUDIO LIMITED | Liverpool | A rating |
| CONSTRUCTS SOLUTIONS LIMITED | Surrey | A rating |
| Constructure Ltd | London | A rating |
| ConstruGomes, Engenharia S.A. | Belfast | A rating |
| CONSTRUKTCLT LIMITED | Berkhamsted, Herts, | A rating |
| Consul Chartered Surveyors | London | A rating |
| CONSUL CONCEPTS LTD | Enderby | A rating |
| Consulate General of the Arab republic of Egypt | London | A rating |
| consulate general of the state of libya | Salford | A rating |
| Consulate of the state of libya | London | A rating |
| CONSULHEALTH LIMITED | London | A rating |
| Consult Inc. solutions Ltd | London | A rating |
| Consult Physio Limited | Peterborough | A rating |
| Consult Plex Limited | London | A rating |
| Consult Red Ltd | Bradford | A rating |
| Consult Search & Selection | Leeds | A rating |
| Consult Search & Selection Limited | Leeds | A rating |
| Consulta Limited | London | A rating |
| CONSULTAANT LIMITED | Surrey | A rating |
| Consultant Connect Limited | Oxford | A rating |
| CONSULTANTS AS A SERVICE LTD | Welwyn | A rating |
| Consultation Claims Limited | Liverpool | A rating |
| Consultation For Everyone Ltd | Birmingham | A rating |
| Consultdoc Limited | London | A rating |
| Consultika Limited | Sleaford | A rating |
| Consulting & Accountancy Services Ltd trading as Elena Meskhi & Co | London | A rating |
| Consulting Block Ltd | SUTTON | A rating |
| Consulting Direct UK Limited | London | A rating |
| Consulting Engineers Group UK Limited | Southampton | A rating |
| Consulting Point Executive Search & Selection Ltd | London | A rating |
| Consulting Structural Engineers Limited | Guildford | A rating |
| Consulting W8 Ltd | London | A rating |
| CONSULTONIC PVT LTD | London | A rating |
| Consumable Direct Ltd | Eccles | A rating |
| Consumer Edge Limited | London | A rating |
| Consumer Rights Energy Limited | Bangor | A rating |
| Consumer Rights Solicitors Ltd | Manchester | A rating |
| Consumers International | London | A rating |
| Consummate Care Ltd | Ketterin | A rating |
| Consumobibo Ltd t/a Home SW15 | London | A rating |
| CONSURE TRAVELS AND TOUR LTD | DARTFORD | A rating |
| Contabo UK Limited | London | A rating |
| Contact | Manchester | A rating |
| Contact 4 Support Services Limited | Harrow | A rating |
| CONTACT INTELLIGENCE LIMITED | Reading | A rating |
| Contact Tyre and Services Ltd | Manchester | A rating |
| Contagious UK Ltd | Edinburgh | A rating |
| Contained Technologies UK Ltd | Spalding | A rating |
| Container Solutions Software Ltd | London | A rating |
| Contamac Limited | Essex | A rating |
| CONTAMINATED LAND: APPLICATIONS IN REAL ENVIRONMENTS | Reading | A rating |
| CONTEC CLEANROOM (UK) LIMITED | Ashington | A rating |
| CONTEC IAS UK LTD | Newcastle Upon Tyne | A rating |
| Contechs Consulting Limited | Basildon | A rating |
| Contemplation Care Ltd | Waterlooville | A rating |
| Contemplation Homes Limited | Waterlooville | A rating |
| Contemporary Design Solutions LLP | London | A rating |
| Contemporary Travel Solutions Limited | Manchester | A rating |
| CONTENT AND IDEA SOLUTIONS LTD | Barking | A rating |
| Content Formula ltd | LONDON | A rating |
| CONTENT PROFICIENCY LTD | Nottingham | A rating |
| Content Renewables Limited | Liverpool | A rating |
| CONTENT+CLOUD LIMITED | Manchester | A rating |
| CONTENTFUL (UK) LIMITED | London | A rating |
| Contento Social Homes CIC | Birmingham | A rating |
| Contentsquare | London | A rating |
| Contenur UK Limited | Nelson | A rating |
| CONTESSA FRESH LIMITED | LONDON | A rating |
| CONTESSA TRADING LTD t/a Thai Pad | Oxted | A rating |
| CONTESTUS UK LTD | BIRMINGHAM | A rating |
| Contex-City Limited | Haslemere | A rating |
| CONTEXTUAL TECHNOLOGIES LTD | London | A rating |
| Conti Carwil Ltd | Ilford | A rating |
| Conti Ltd | London | A rating |
| Contiem Limited | Sutton | A rating |
| Contiki Services Ltd | Bromley | A rating |
| Contilio Limited | London | A rating |
| CONTINENT FOODS LIMITED | Birmingham | A rating |
| CONTINENT PROJECTS LTD | London | A rating |
| Continental Business Service Limited | Ilford | A rating |
| Continental Capital Markets Ltd | Croydon | A rating |
| CONTINENTAL CLOTHING COMPANY LIMITED | Bournemouth | A rating |
| Continental Constructors & Builders UK Ltd | Slough | A rating |
| Continental Drifts Ltd | London | A rating |
| Continental Engineering Services Limited | Lichfield | A rating |
| Continental Environmental Services Ltd - Survey Safe | Colchester | A rating |
| CONTINENTAL EVENT MANAGEMENT LTD | London | A rating |
| Continental Food Bar Limited | Derby | A rating |
| Continental Foods (Trading) Ltd T/A Continental Supreme | Slough | A rating |
| CONTINENTAL FOODS GLOUCESTER LIMITED | Solihull | A rating |
| CONTINENTAL FREIGHT SERVICES LTD | Southall | A rating |
| Continental Ice Cream Foods Limited T/A Continental Dairy | Romford | A rating |
| CONTINENTAL INSPECTION INTERNATIONAL LIMITED | BIRMINGHAM | A rating |
| Continental Networks LTD | Gateshead | A rating |
| CONTINENTAL SPICE5 LTD | Manchester | A rating |
| CONTINENTAL SPICES LIVINGSTON LTD | LIVINGSTON | A rating |
| CONTINENTAL SUPER STORES | MOTHERWELL | A rating |
| Continental Supermarket LTD | London | A rating |
| Continental Tyre Group Ltd | Datchet | A rating |
| CONTINENTAL UK TRADING LIMITED | WIGAN | A rating |
| Continental Ventures Ltd | London | A rating |
| CONTINENTAL WHOLESALE UK LTD | London | A rating |
| Continued Care from Oakville Ltd | Harrogate | A rating |