| Clelands of the Borders Ltd | Galashiels | A rating |
| Clement Acoustics Ltd | London | A rating |
| Clement Clarke International | Harlow | A rating |
| Clement Mind Limited | London | A rating |
| Clementine Communications | Parsons Green | A rating |
| Clemessy UK Ltd | Bristol | A rating |
| Cleo AI Ltd | London | A rating |
| CLEO Systems 24 Ltd | Ashford | A rating |
| Cleobury Dental Practice | Cleobury Mortimer | A rating |
| Cleone Foods Limited | Birmingham | A rating |
| Cleos Caring Corner Day Nursery Ltd | Bristol | A rating |
| Clere Group Limited | Newbury | A rating |
| Clerkenwell Clinics Limited | London | A rating |
| Clerkenwell Kiosk Ltd | London | A rating |
| Clerkenwell Medical Practice | London | A rating |
| ClerksWell | London | A rating |
| Clermont Consultants (UK) Limited | Borehamwood | A rating |
| Clermont Energy Partners LLP | Banbury | A rating |
| Clermont Group Ltd. | Redbridge | A rating |
| Clermont Hotel Management Limited | London | A rating |
| CLES Resources Limited | Richmond | A rating |
| Cleve Hair | London | A rating |
| CLEVECHEM LTD | REDCAR | A rating |
| Clevedon Cricket Club | Clevedon | A rating |
| Clevedon Medical Centre | Clevedon | A rating |
| Cleveland (Vision Plus) Ltd t/a Specsavers | Stockton On Tees | A rating |
| Cleveland & Co Associates Limited | London | A rating |
| Cleveland Clinic London Ltd | Belgravia | A rating |
| Cleveland Healthcare Group Limited | Stockport | A rating |
| Cleveland Potash Ltd | Saltburn-by-the-Sea | A rating |
| Cleveland Process Designs Limited | Yarm | A rating |
| Cleveland-Northern Ireland International Basketball Academy | Downpatrick | A rating |
| Cleveleys Convenience Store Ltd | Thornton-Cleveleys | A rating |
| CLEVELEYS SPICE LTD | Thornton-Cleveleys | A rating |
| Clever Cubs Ltd T/A Monkey Puzzle Day Nursery Harrow | Harrow | A rating |
| Clever Heating and Cooling Solutions Ltd | Aylesbury | A rating |
| Clever Student Lets Ltd | Plymouth | A rating |
| Cleverchain limited | London | A rating |
| Clevernet UK Limited | Surrey | A rating |
| Cleversocks Limited | Birmingham | A rating |
| Cleversys Limited | Reading | A rating |
| CleverTouch Marketing Limited | Ropley | A rating |
| Clevertronics International UK Limited | London | A rating |
| Clevry UK Ltd | BRIGHTON | A rating |
| CLF Distribution ltd | Southampton | A rating |
| CLFIS (UK ) Ltd - Canada Life | London | A rating |
| CLI SECURE LTD | London | A rating |
| CLIA Care Ltd | London | A rating |
| Click 4 Bargain Ltd | Salford | A rating |
| Click and Deliver London Ltd T/A Click for Delivery | London | A rating |
| CLICK ASSIST LTD | Barking | A rating |
| Click Design Ltd | Manchester | A rating |
| Click Entertainment Limited | Croydon | A rating |
| Click Entertainment LTD | Croydon | A rating |
| Click Europe Ltd | London | A rating |
| CLICK HALAL LTD | Ilford | A rating |
| Click Hearing | Upminster | A rating |
| Click Law Partners Solicitors | London | A rating |
| Click N Fly Travel Ltd | Reading | A rating |
| Click N Fly Travel Ltd | ,Reading | A rating |
| Click Solutions Limited | Wembley | A rating |
| Click To Go Limited T/A Ledsa Mart | Notttingham | A rating |
| CLICK&DELIVER UK LTD | Northampton | A rating |
| Clickable Solutions Ltd | Bradford | A rating |
| CLICKNSEND LIMITED | Aberdeen | A rating |
| ClickView Limited | London | A rating |
| ClickZ Media Limited | London | A rating |
| Clictic Consulting Ltd | Watford | A rating |
| Client Bridge Group Limited | Warrington | A rating |
| clientberry ltd T/A phonecentre | london | A rating |
| ClientEarth | London | A rating |
| Clientserver Technology Solutions Ltd | Rugby | A rating |
| Clientsinfocus LTD trading as Home Instead Aylesbury Vale | Aylesbury | A rating |
| Cliff College | Hope Valley | A rating |
| Cliff Court Care Home | East Sussex | A rating |
| Cliff House Medical Practice | Lincoln | A rating |
| CLIFF HOUSE SERVICE STATION LTD | England | A rating |
| CLIFF SERVICES LTD | MELTON MOWBRAY | A rating |
| Cliff Solutions Limited | Leeds | A rating |
| CLIFF'S COACHES LTD | High Wycombe | A rating |
| Cliffdale Limited | Shrewsbury | A rating |
| Clifford Chance LLP | London | A rating |
| Clifford Harris & Co Solicitors | London | A rating |
| Clifford House Residential Care Home | Andover | A rating |
| Clifford Road Surgery (NHS) | Hounslow | A rating |
| Clifford Street Advisors LLP | London | A rating |
| Clifftop Care Home | Swanage | A rating |
| Clifton Care Limited | Bristol | A rating |
| Clifton College | Bristol | A rating |
| Clifton Court Medical Practice | Darlington | A rating |
| Clifton Cricket Club | Ashbourne | A rating |
| Clifton Diocese | Bristol | A rating |
| Clifton Foods | Luton | A rating |
| Clifton Garden Dental Practice | Goole | A rating |
| Clifton Greens London Ltd | London | A rating |
| CLIFTON HOMECARE LIMITED | ST ANNES ON SEA | A rating |
| Clifton Hotel Ltd T/A Best Western Clifton Hotel | Folkestone | A rating |
| Clifton Medical Centre | Rotherham | A rating |
| Clifton Medical Practice | Nottingham | A rating |
| Clifton Mini Market | Bristol | A rating |
| Clifton Packaging Group | Leicester | A rating |
| Clifton Packaging Group Ltd | Leicester | A rating |
| Clifton Private Finance Limited | Bristol | A rating |
| Clifton Road Surgery | Rugby | A rating |
| Clifton Trade Bathrooms | Bolton | A rating |
| Clifton Village Pharmacy | Bristol | A rating |
| Cliftonville Academy Cricket Club | Newtownabbey | A rating |
| Cliftonville Off Licence Ltd | Margate | A rating |
| CLIIKK ACCIDENT REPAIR CENTRE LTD | Derby | A rating |
| Climar Industries Limited | Newport | A rating |
| Climate 2025 Limited | Sheffield | A rating |
| Climate Aligned Company Ltd | London | A rating |
| Climate Asset Management Limited | London | A rating |
| Climate Bonds Initiative | London | A rating |
| Climate Change Media Ltd | London | A rating |
| Climate Design Studio Limited | Belfast | A rating |
| Climate Essentials Limited | London | A rating |
| Climate First Limited | London | A rating |
| CLIMATE FLOW LIMITED | London | A rating |
| Climate Impact Partners Ltd | London | A rating |
| Climate Impact X PTE. LTD. (London Branch) | London | A rating |
| Climate Insulation Limited | Cheadle | A rating |
| Climate Law and Policy | Oxford | A rating |
| Climate Policy Initiative | London | A rating |
| Climate Risk Services Limited | London | A rating |
| Climate Saver Limited | Birmingham | A rating |
| Climate Tech Insights UK Limited | London | A rating |
| Climate Windows Ltd | London | A rating |
| Climate X | London | A rating |
| Climate-KIC Holding B.V.(UK Branch) | London | A rating |
| ClimatePartner UK Limited | London | A rating |
| CLIMAX CUISINE LTD T/a Magic Wok & Box | London | A rating |
| Climax Molybdenum UK Ltd | Stowmarket | A rating |
| Climb Commerce Ltd | Worcester | A rating |
| Climb Global Solutions Ltd | Newton Abbot | A rating |
| ClimeTrek Ltd | Sunbury Upon Thames | A rating |
| Climpson & Sons Ltd | London | A rating |
| CLINCH INTERNATIONAL LTD (16900283) | ENGLAND | A rating |
| CLINCHOICE LIMITED | Slough | A rating |
| Clini-Hub Limited | Newcastle Upon Tyne | A rating |
| Clinica London Ltd | London | A rating |
| Clinical Care Ltd T/A Medicine Drop | Derby | A rating |
| Clinical Diagnostic Services | Cheadle | A rating |
| Clinical Network Systems Limited | London | A rating |
| Clinical Outcomes Solutions Limited | Folkstone | A rating |
| Clinical Prevention and Rehabilitation Ltd | London | A rating |
| Clinigen Limited | Burton-on-Trent | A rating |
| Clinilabs | London | A rating |
| Clinimarg Limited | Watford | A rating |
| Clinique La Prairie UK LTD | London | A rating |
| Clinique La Prairie UK Ltd. | Hildenborough, Tonbridge | A rating |
| Clinisupplies Limited | Watford | A rating |
| CliniSys Solutions Limited | Woking | A rating |
| Clinkard Group | Middlesbrough | A rating |
| Clinova Limited | London | A rating |
| CLINPHARM PLUS LTD | Dudley | A rating |
| Clinquant Business Solutions Ltd | Greater London | A rating |
| Clintech Hub Limited | BOOTLE | A rating |
| Clinton Consultancy Ltd | London | A rating |
| Clintons | London | A rating |
| Clinty Chemicals Ltd | Belfast | A rating |
| Clinuvel (UK) Ltd | Leatherhead | A rating |
| CLIP JOINT LADIES LTD | Wednesfield | A rating |
| Clipfine Limited | London | A rating |
| CLIPHAIR LIMITED | Wallington | A rating |
| Clipper Design Ltd | London | A rating |
| CLIPPER VENTURES PLC | GOSPORT | A rating |
| Clippers | ROCHDALE | A rating |
| Clippings LTD | London | A rating |
| Clipstone Convenience Store | Nottinghamshire | A rating |
| Clipstone Cricket club | Mansfield | A rating |
| Clipway Limited | London | A rating |
| Cliqnet Limited | London | A rating |
| Clique Brands UK Ltd | London | A rating |
| Clitheroe Cricket Bowls & Tennis Club | Clitheroe | A rating |
| CLIVE COX RACING LTD. | LAMBOURN | A rating |
| Clive Holmes Limited | Christchurch | A rating |
| Clive Owen LLP | Darlington | A rating |
| Clive Parade Pharmacy | SWINDON | A rating |
| Clive Sutton Limited | London | A rating |
| Clivedale Ventures Limited | London | A rating |
| CLK PROPERTIES LTD | DAGENHAM | A rating |
| CLM Fireproofing Limited | London | A rating |
| CLM Search Ltd | London | A rating |
| CLO-CLO LTD | LONDON | A rating |
| CLOBOTICS UK LTD | London | A rating |
| Clock Clinic Limited (The) | Putney | A rating |
| Clock House Convenience | Coulsdon | A rating |
| Clock Tower Cars UK Limited | Surrey | A rating |
| Clockhouse Dental | York | A rating |
| CLOCKHOUSE FURNITURE LIMITED | NORTH BERWICK | A rating |
| Clockhouse Podiatry Ltd | Horsham | A rating |
| Clockwise Group Limited | Basingstoke | A rating |
| Clockwork IT Ltd | Coventry | A rating |
| Clockwork Media SA UK Ltd. | London | A rating |
| Clockwork Pharmacy Ltd | London | A rating |
| Clockwork Removals Ltd | Edinburgh | A rating |
| Clockwork Technologies UK Limited | London | A rating |
| Clodan Limited t/a The White Horse Inn | Saintfield | A rating |
| Clogher Valley Meats Ltd | Clogher | A rating |