| Cornwall Health Care Services Ltd | Redruth | A rating |
| Cornwall Hospice Care Limited | St Austell | A rating |
| Cornwall Insight Ltd | Norwich | A rating |
| Cornwall Old Peoples Housing Society | Perranporth | A rating |
| Cornwall Partnership NHS Foundation Trust | Bodminl | A rating |
| Cornwallis Care Services Ltd | Carbis Bay | A rating |
| Cornwallspice Limited | St Ives | A rating |
| CORNWOOD CRICKET CLUB | CORNWOOD | A rating |
| Corona Energy Limited | Watford | A rating |
| Coronation Convenience Store Limited | Reading | A rating |
| Coronation International Limited | London | A rating |
| CORONATIONMINIMARKET LIMITED | London | A rating |
| Coros UK Limited | London | A rating |
| COROS WEARABLES UK LTD | Skipton | A rating |
| Corpag Services (UK) Limited | London | A rating |
| Corporate & Accelerator Solutions LLP | London | A rating |
| Corporate AV Hire Ltd | Belfast | A rating |
| Corporate Avenue Services Limited | London | A rating |
| Corporate Event Solutions Limited | Newport | A rating |
| CORPORATE FINANCIAL MANAGEMENT SYSTEMS LIMITED | Watford | A rating |
| Corporate Governance Risk Limited | Reading | A rating |
| Corporate Project Solutions Limited | Globe Park | A rating |
| Corporate Research and Investigations Limited | London | A rating |
| Corporate Research Forum Limited | London | A rating |
| Corporate Solutions Consulting Limited | Harrow | A rating |
| CORPORATE TAXIS DUNFERMLINE LTD | Dunfermline | A rating |
| Corporate Translations Inc. (UK) Limited | Maidenhead | A rating |
| Corporate Travel Management (United Kingdom) Limited | London | A rating |
| Corporate UK Services Limited | Ilford | A rating |
| Corporate Vehicle Solutions Limited | Ramsgate | A rating |
| CORPORATEMAX(UK) LTD | Gerrards Cross | A rating |
| Corporater UK Ltd | Warren Park | A rating |
| CORPORATEWEAR UK LTD | BIRMINGHAM | A rating |
| Corporation Pop Limited | Manchester | A rating |
| corpus christi carmelites | york | A rating |
| Corpus Christi Catholic Academy Trust | Manchester | A rating |
| Corpus Christi Catholic Primary School | London | A rating |
| Corpus Christi College | Cambridge | A rating |
| CORQ Studio | Poole | A rating |
| Corra Foundation | Edinburgh | A rating |
| CORRA LINN DENT LTD | Bury | A rating |
| CORRAN SUPPORT LTD | CROPTHORNE | A rating |
| Correct Contract Services Ltd | Andover | A rating |
| Corrective Chiropractic (MK) Limited | Milton Keynes | A rating |
| Corrective Chiropractic Ltd | Belfast | A rating |
| Correla Limited | Solihull | A rating |
| Correlation Risk Partners Limited | London | A rating |
| Corriewood Lodge | Bangor | A rating |
| Corriewood Private Clinic Ltd | Castlewellan | B rating |
| Corrigall Fishing Ltd | Portree | A rating |
| Corrigan Gore Limited | Godalming | A rating |
| Corroconsult UK Ltd | Telford | A rating |
| Corroless Eastern Ltd | Dereham | A rating |
| Corrosion Radar Ltd | Cambridge | A rating |
| Corrpro UK (Holdings) Limited | Stockton on Tees | A rating |
| Corry Dental Care | Magherafelt | A rating |
| Corrymeela Community | Ballycastle | A rating |
| Corryn Biotechnologies | Baglan | A rating |
| CORSAIR CAPITAL LLP | LONDON | A rating |
| Corsair Components Limited (UK) | Berkshire | A rating |
| Corsearch UK Limited | London | A rating |
| Corserv Solutions Limited | Bodmin | A rating |
| Corsham Cricket Club | Corsham | A rating |
| CORSICA STUDIOS | LONDON | A rating |
| Corstorphine & Wright Ltd. | London | A rating |
| CORTALEISURE LTD | Edinburgh | A rating |
| Corten Ltd | London | A rating |
| Corteva Agriscience UK Limited | Cambridge | A rating |
| Cortex Engineering Solutions Ltd | Dungannon | A rating |
| Cortex Organics Ltd | Kidlington | A rating |
| CORTI AI UK LIMITED | London | A rating |
| Cortium Polo Team | Haslemere | A rating |
| Cortizo UK Limited | Croydon | A rating |
| Cortland Development UK Limited | London | A rating |
| Corton House and Brewster Court | Norwich | A rating |
| Corus Consultancy Ltd | London | A rating |
| Corus Hotels Limited | Berkhamsted | A rating |
| Corvan Limited | Coventry | A rating |
| Corvan Limited T/A Cordelia Court | Coventry | A rating |
| Corvedale Fresh Ltd | Craven Arms | A rating |
| Corvell Health Care Limited | Leigh On Sea | A rating |
| Corvia Limited t/a Ticketer | Hungerford | A rating |
| CORVID CONSULTING UK LTD | CROYDON | A rating |
| Corvide Limited | London | A rating |
| Corvus Learning Trust | Sandhurst | A rating |
| Corvus London Limited | London | A rating |
| Corvus Recruitment | BELFAST | A rating |
| Corwen convenience business ltd | Corwen | A rating |
| Cory | London | A rating |
| Cory Brothers Ltd | Ipswich | A rating |
| Cos Freight Ltd | Luton | A rating |
| Cos Lane Medical Practice | Glenrothes | A rating |
| COS Subs Limited T/A Subway | Wolverhampton | A rating |
| COS Subs Ltd T/A Subway | Wolverhampton | A rating |
| Cosa Vostra UK Limited | London | A rating |
| Cosart Limited | Cardiff | A rating |
| Cosco Shipping (UK) Co Ltd | Barking | A rating |
| coseley medical centre | bilston | A rating |
| Cosentino UK Limited | Hook | A rating |
| Cosey Homes ltd | st helens | A rating |
| Cosgrove Care | Glasgow | A rating |
| COSGUN FISH AND CHIPS LIMITED | London | A rating |
| Cosham Specsavers Limited T/A Specsavers Opticians | Cosham | A rating |
| Cosi Living Limited | Slough | A rating |
| Cosier Heat Ltd | London | A rating |
| Cosimac Drytech Ltd | Bangor | A rating |
| Cosist Ltd | London | A rating |
| COSL Offshore Crew AS | Aberdeen | A rating |
| COSMEDIC SHOP LTD | Preston | A rating |
| Cosmedicare UK Ltd | Livingston | A rating |
| Cosmetic and family dentistry Hessle limited | Hessle | A rating |
| COSMETIC COURSES LIMITED | Billericay | A rating |
| Cosmetic Dental Laboratory Ltd | London | A rating |
| Cosmetic Executive Women (CEW) UK | London | A rating |
| COSMETIC REPAIR SOLUTIONS LTD | CHESTERFIELD | A rating |
| COSMETICS SURGERY LIMITED | London | A rating |
| COSMIC BUSINESS HOUSE LTD | London | A rating |
| COSMIC CODE CONSULTING LIMITED | Harrow | A rating |
| Cosmic Healthcare Ltd | Watford | A rating |
| Cosmic Kids Trading Limited | Marlow | A rating |
| Cosmic Living Ltd | Dewsbury | A rating |
| COSMO ACADEMIC LTD | Newcastle upon Tyne | A rating |
| Cosmo Buy Ltd | DROYLSDEN | A rating |
| Cosmo Clinic | London | A rating |
| COSMO SMART SERVICES LIMITED | Gloucester | A rating |
| Cosmo-Giantwheel Limited | London | A rating |
| Cosmonauts Ltd. | London | A rating |
| Cosmopolitan Accountants Ltd | Morden | A rating |
| COSMOPOLITAN RESTAURANTS (UK) LIMITED | Croydon, England | A rating |
| Cosmor Groundworks Limited | Manchester | A rating |
| COSMOS HEALTHCARE LTD | Enfield London | A rating |
| Cosmos Interactive Ltd | London | A rating |
| COSMOS PAK LIMITED | Salford | A rating |
| Cosmos Video Limited | London | A rating |
| Cost Cutter | London | A rating |
| Cost Cutter | Milton Keynes | A rating |
| Cost Cutter -Essex | Essex | A rating |
| COST CUTTER EXPRESS MAIDSTONE LTD | KENT | A rating |
| COST CUTTER RUGBY LIMITED | RUGBY | A rating |
| Cost Cutter Worcester Park | Worcester park | A rating |
| COST LESS TOWERBRIDGE LIMITED | London, | A rating |
| Cost Saver Ridgewood Ltd | St Helens | A rating |
| Cost Saver UK Limited t/a Costcutter | Thatcham | A rating |
| Costa Chiropractic | Bathgate | A rating |
| Costa Limited | High Wycombe | A rating |
| COSTADORO UK LTD | Rochester | A rating |
| Costain Care Dover Limited | DEAL | A rating |
| Costain Care Limited | Margate | A rating |
| Costain Limited | London | A rating |
| CoStar UK Limited | London | A rating |
| Costco Wholesale UK Limited | Watford | A rating |
| Costcutter | Twickenham | A rating |
| Costcutter | Welling | A rating |
| Costcutter | London | A rating |
| COSTCUTTER | WOLVERHAMPTON | A rating |
| COSTCUTTER | Northampton | A rating |
| COSTCUTTER (GREENOCK) LTD | Greenock | A rating |
| COSTCUTTER (HARROW) LIMITED | Harrow | A rating |
| Costcutter (Porton Store) | Biggleswade | A rating |
| COSTCUTTER BIRTLEY LIMITED | BIRTLEY | A rating |
| COSTCUTTER HAILSHAM LTD | Hailsham | A rating |
| Costcutter Priory News | Birmingham | A rating |
| Costcutter Supermarkets Group Ltd | York | A rating |
| COSTCUTTER T/A SASITHARAN | GUILFORD | A rating |
| Costello Medical Consulting Limited | Cambridge | A rating |
| Coster Aerosols Limited | Chesterfield | A rating |
| Coster Group UK | Derby | A rating |
| Costero Holdings Limited | London | A rating |
| COSTESSEY PHARMACY | NORWICH | A rating |
| Costify Ltd | London | A rating |
| Costplan Services (south east) Limited | Ashford | A rating |
| Costworth | Dunstable | A rating |
| Cosworth Electronics Ltd | Cambridge | A rating |
| Cosworth Limited | Northampton | A rating |
| COSY ART LIMITED | London | A rating |
| COSY HAUZ LIMITED | London | A rating |
| Cosy Kitchen (Huddersfield) Ltd t/a Cosy Kitchen | Huddersfield | A rating |
| COSY SPOT LTD | RUISLIP | A rating |
| CoSyne Therapeutics Limited | London | A rating |
| Cosyseal (Double Glazing) Limited | Surrey | A rating |
| Cosz Enterprise UK Ltd | Sunderland | A rating |
| Cot Valley Collective Limited | St Just | A rating |
| Cote Restaurant Group Ltd | London | A rating |
| Cotham Technologies Limited | Bristol | A rating |
| Coton Care Limited | Wolverhampton | A rating |
| Cotswold Archaeology | Kemble | A rating |
| Cotswold Brewing Company Limited | Bourton-on-the-Water | A rating |
| Cotswold Classic Car Restorations | Cirencester | A rating |
| Cotswold Energy Group Ltd | Stonehouse | A rating |
| Cotswold Farm Hideaway Limited | Wotton-under-Edge | A rating |
| Cotswold House Care Home Limited | Stroud | A rating |
| Cotswold Medical Practice | Cheltenham | A rating |
| Cotswold Restaurant Group Ltd t/a Muse Brasserie | Cheltenham | A rating |
| Cott's Care Ltd | Cheltenham | A rating |
| Cottage Beck Stores Ltd T/A Go Local | North Lincolnshire | A rating |
| Cottage Care Services Scotland Ltd | Greenock | A rating |
| COTTAGE CLINIC LIMITED | TOLWORTH | A rating |
| Cottage Day Limited | Bexley | A rating |
| COTTAGE HOMECARE SERVICES LTD. | Heywood | A rating |
| Cottage in the Wood | Keswick | A rating |