| Civic Marketing Limited | Bury | A rating |
| Civic Recruitment Limited | Dartford | A rating |
| Civic Studios International Limited | London | A rating |
| Civica UK Ltd | London | A rating |
| CIVICARE (BEDS HERTS & BUCKS) LTD | Dunstable | A rating |
| Civicare Central Limited | Droitwich | A rating |
| CIVIL AND STRUCTURAL ENGINEERING SHETLAND LIMITED | Tingwall | A rating |
| Civil Aviation Authority | Crawley | A rating |
| Civil Engineering Crew Limited | Birmingham | A rating |
| Civil Service North of Ireland Cricket Club | Belfast | A rating |
| Civile Engineering Ltd | Lincoln | A rating |
| CIVILS CONSULTING LTD | London | A rating |
| Civinity Engineering UK Ltd | Gillingham | A rating |
| Civo Ltd | Stevenage | A rating |
| Ciwan Limited trading as The Old Bank Cafe | Deeside | A rating |
| CIYMS Cricket Club | Belfast | A rating |
| CJ Dea ltd | GRAYS | A rating |
| CJ Foods Sales UK, Ltd | London | A rating |
| CJ Lang & Son Limited | Dundee | A rating |
| CJ Noah Ltd | Ely | A rating |
| CJAJ angels supporting living | Nottingham | A rating |
| CJAY PROPERTY MANAGEMENT LTD | London | A rating |
| CJB Services Ltd | Hedgerley | A rating |
| CJC Kent Limited | Dartford | A rating |
| CJCH Legal Ltd | Cardiff | A rating |
| CJCH Limited | Cardiff | A rating |
| CJJ STORE LTD | Huntingdon | A rating |
| CJR Propulsion Ltd | Southampton | A rating |
| CJS Managed Cloud Services Ltd | Leeds | A rating |
| CJS Risk Management Ltd | London | A rating |
| CJV Dining Ltd t/a Mr Wang Hot Pot | Cambridge | A rating |
| CJX CONSTRUCTION LTD | London | A rating |
| CK Frozen Food Limited | Barking London | A rating |
| CK International Ltd | Dungannon | A rating |
| CK IT Services Limited | HERTS | A rating |
| CK Kumar LTD | LEEDS | A rating |
| CK Morgan Ltd | London | A rating |
| CK PROPERTIES AND FAMILY OFFICE LIMITED | LONDON | A rating |
| CK Rail Solutions | Chesterfield | A rating |
| CK RETAIL JACKSON LTD | NEWCASTLE UPON TYNE | A rating |
| CK SOLICITORS | London | A rating |
| CK Wine Store Ltd | Leighton Buzzard | A rating |
| Ckay Solution Limited | Newcastle Upon Tyne | A rating |
| CKI Gas Infrastructure Limited | London | A rating |
| CKK Civil Engineering Limited | Southend On Sea | A rating |
| CKML LIMITED | Blyth | A rating |
| CKP Gretna Hotels Ltd | Gretna | A rating |
| CKR CONSULTANTS LTD T/A CAMERON KENNEDY | LONDON | A rating |
| CKRe Ltd | London | A rating |
| CKREATIVE EVENTS LIMITED | Harrow | A rating |
| CKS GROCERY LTD | Gateshead | A rating |
| CKT CONSULTING KULTUR TOURISMUS LTD | London | A rating |
| CKT LONDON LIMITED | LONDON | A rating |
| CL & Co Management Services Limited | LONDON | A rating |
| CL CAPITAL (UK) LIMITED | Wolverhampton | A rating |
| CL Catering at Drenagh | Maghera | A rating |
| CL Convenience Store Ltd | Milton Keynes | A rating |
| CL Corporation Limited | Worcester Park | A rating |
| CL INTERNATIONAL MANAGEMENT (UK) LIMITED | London | A rating |
| CL Medicall Aid Limited | Doncaster | A rating |
| CL SYNERGY UK LIMITED | London | A rating |
| CL Tech UK Limited | Southampton | A rating |
| CL2 LLP | London | A rating |
| CL24 Ltd | Colchester | A rating |
| CLAAS UK Limited | Bury St Edmunds | A rating |
| Clachan Grill | Ballater | A rating |
| CLACTON DENTAL CARE LTD (t/a Together Dental) | Watford | A rating |
| Cladern Ltd | London | A rating |
| CLADMATE FACADE SYSTEMS LTD | London | A rating |
| Clague LLP | Canterbury | A rating |
| CLAIM 247 LTD | Salford | A rating |
| Claim Capital Ltd | LONDON | A rating |
| CLAIM HELP UK LTD | Ilford | A rating |
| Claim Time Limited | Birmingham | A rating |
| Claimdesk Limited | Bradford | A rating |
| CLAIMER TECH LTD | London | A rating |
| Claimsorted Ltd | London | A rating |
| CLAIMWISE AI LIMITED | London | A rating |
| Clairo LTD | London | A rating |
| Clan Contracting Ltd | Widnes | A rating |
| Clan Gordon Ltd | Edinburgh | A rating |
| Clan Ice Hockey Club | Glasgow | A rating |
| Clancy Consulting Limited | Manchester | A rating |
| CLANDON CARE LIMITED | Ilford | A rating |
| Clanfield Stores Limited | Waterlooville | A rating |
| Clanmark Ltd | London | A rating |
| Clanmil Housing Association Ltd | Belfast | A rating |
| CLAP ACADEMY LIMITED | Croydon | A rating |
| Clapham Discount Food and Wine | Bedford | A rating |
| Clapham Solicitors Ltd T/A Angira Solicitors | London | A rating |
| Clapham Visionplus Ltd TA Specsavers Clapham Ltd | London | A rating |
| Clapham Wholefoods Limited | London | A rating |
| Clapps News Limited | Hayling Island | A rating |
| Clapton Girls Academy | London | A rating |
| CLARA BARTONS CARE SERVICES LTD | Birmingham | A rating |
| Clara Technologies (UK) Limited | London | A rating |
| Claranet Ltd | London | A rating |
| CLARAS COCINA LTD | WELLINGBOROUGH | A rating |
| Clarastra UK Limited | London | A rating |
| Clarasys Limited | London | A rating |
| Clardent Limited | Southsea | A rating |
| Clare College | Cambridge | A rating |
| CLARE FOOD SUPERSTORE LIMITED | CARDIFF | A rating |
| Clare Hall, University of Cambridge | Cambridge | A rating |
| Clare Mathias | East Horsley | A rating |
| ClaredonLocal retail Ltd | Cleveland | A rating |
| Claregrange Trading Limited | Nottingham | A rating |
| Clarehaven Ltd | Newmarket | A rating |
| Claremont Care Home | Manchester | A rating |
| Claremont Communications Ltd | London | A rating |
| Claremont Court Care Home | Pontypridd | A rating |
| Claremont dental Practice | Seaford | A rating |
| Claremont High School | Harrow | A rating |
| CLAREMONT LIVING LIMITED | Birmingham | A rating |
| Claremont Park Limited | Edinburgh | A rating |
| CLARENAI UK LIMITED | London, England | A rating |
| Clarence Court Care Home | Glasgow | A rating |
| Clarence Food and Wine | Newport | A rating |
| Clarence Medical Centre | Rhyl | A rating |
| Clarence Road Dental Care Partnership | Chesterfield | A rating |
| CLARENDON AUTOMOTIVE PERFORMANCE LTD | Birmingham | A rating |
| CLARENDON CARE GROUP LIMITED | STOURBRIDGE | A rating |
| Clarendon Care Limited | Southsea | A rating |
| Clarendon Care Services Limited | Stourbridge | A rating |
| Clarendon Construction & Contracting Ltd | Harrietsham | A rating |
| CLARENDON GLAZING LTD | Smethwick | A rating |
| Clarendon Home Care | Kingston Upon Thames | A rating |
| Clarendon Hotel (Blackheath) Ltd | Blackheath | A rating |
| Clarendon House Care Limited t/a Clarendon House | Coventry | A rating |
| Clarendon International Education Limited | Oxford | A rating |
| Clarendon Lodge Medical Practice | Leamington | A rating |
| Clarendon Mews Care Limited | LEICESTER | A rating |
| CLARENDON STUDIO LTD | Birmingham | A rating |
| CLARENDON SURGERY | SALFORD | A rating |
| Clarendon Wellbeing House | LONDON | A rating |
| CLAREPHARM LIMITED | DEVON | A rating |
| Claret Capital Partners Limited | London | A rating |
| Claretian Missionaries Trust | St Neots | A rating |
| Clarette London Limited | London | A rating |
| CLARI UK LIMITED | CHELTENHAM | A rating |
| Claria Ltd | Warwick | A rating |
| Claridge's Hotel Limited | London | A rating |
| CLARINA RETAIL LIMITED | Derby | A rating |
| Clarins UK Ltd | London | A rating |
| Clarion Construction Limited | West Bromwich | A rating |
| Clarion Corvus Trust | Norwich | A rating |
| Clarion Events Ltd | London | A rating |
| CLARION HEALTH LIMITED | LONDON | A rating |
| Clarion Logic Limited | London | A rating |
| Clarion Partners Europe (U.K.) Limited | London | A rating |
| CLARION SHIPPING AND LOGISTICS UK LTD | FELIXSTOWE DOCKS | A rating |
| Clarios UK Limited | Watford | A rating |
| CLARIS HOUSEWARES & STATIONERY SOLUTIONS LIMITED | Perivale | A rating |
| Clarissa's Home Healthcare Services Ltd | Bicester | A rating |
| Claritas HealthTech Ltd | London | A rating |
| Claritas Marketing Limited | London | A rating |
| Claritech Analysis Limited | London | A rating |
| Clarity AI LTD | London | A rating |
| Clarity Bristol Limited | Melksham | A rating |
| Clarity Capital Partners Limited | London | A rating |
| CLARITY CARE PROVIDERS LTD | ST NEOTS | A rating |
| Clarity Consulting Associates Ltd | London | A rating |
| Clarity Homecare (Direct) Ltd | Ashford | A rating |
| Clarity Homecare [Bury] LTD | Radcliffe, Bury | A rating |
| CLARITY HOUSING LIMITED | Stratford | A rating |
| Clarity Led Limited | Manchester | A rating |
| Clarity London Ltd | London | A rating |
| Clarity Operations Limited | Reading | A rating |
| Clarity Sensors Ltd | Cambridge | A rating |
| Clarity Software Group Limited | Solihull | A rating |
| CLARITY STORES LTD | Bexhill | A rating |
| Clarity Travel Management | Manchester | A rating |
| Clarity Wealth Management LLP | Totnes | A rating |
| Clarivate Analytics (UK) Limited | London | A rating |
| Clark and Carter Restorations Ltd | Braintree | A rating |
| CLARK AND WATSON LTD t/a Clark & Watson Dental Practice | Falkirk | A rating |
| Clark Degnan Limited | Durham | A rating |
| Clark House Dental Surgeries Limited | Plymouth | A rating |
| Clark Insurance UK Ltd | Bristol | A rating |
| Clark Smith Partnership Limited | ROMFORD | A rating |
| Clark Tracks Ltd | Dumfries | A rating |
| Clarke and Co | London | A rating |
| Clarke Banks (Fire Engineering) Limited | Wakefield | A rating |
| Clarke Energy Ltd | Liverpool | A rating |
| Clarke Mairs Law Limited | Newcastle-upon-Tyne | A rating |
| CLARKE WEST LLP | Birmingham | A rating |
| Clarke Willmott LLP | Southampton | A rating |
| CLARKEBOND UK LTD | BRISTOL | A rating |
| CLARKES FRUIT & VEG LIMITED | Wolverhampton | A rating |
| Clarks Bakery | Dundee | A rating |
| CLARKS HEALTHCARE LTD | london | A rating |
| Clarksfields Flooring & Furniture | Oldham | A rating |
| Clarkson and Woods Limited | Blackford | A rating |
| Clarkson Controls Limited | Belbroughton | A rating |
| Clarkson Surgery | WISBECH | A rating |
| Clarksons PLC | London | A rating |
| Claro London Limited | London | A rating |
| Claroty (UK) Limited | London | A rating |
| Clartes Ltd | Coggeshall | A rating |
| CLARUSTO LOGISTICS LTD T/A CLARUSTO LOGISTICS | East Kilbride | A rating |