| C & S RECRUITMENT LIMITED | Glasgow | A rating |
| C & C ALPHA GROUP LIMITED | London | A rating |
| C & C LAUNDRY SERVICES LIMITED | Wembley | A rating |
| C & C Reservoirs Limited | Reading | A rating |
| C & D Food and Wine Store | London | A rating |
| C & D Foods (Driffield) Unlimited | Driffield | A rating |
| C & F ENG LIMITED | Letchworth | A rating |
| C & J Meats Limited | Kilmore | A rating |
| C & J Raymond & Partners | Templecombe | A rating |
| C & K HEALTHCARE LIMITED | HARROW | A rating |
| C & K Meats Limited | Eye | A rating |
| C & K TRANSPORT YARD LTD | Wednesbury | A rating |
| C & M WEALTH INTERNATIONAL LTD | London | A rating |
| C & P Medical Trading Ltd | Melksham | A rating |
| C & R Construction South West Ltd | Crediton | A rating |
| C & S BUILDERS MERCHANTS (STAMFORD HILL) LIMITED | London | A rating |
| C & S CHURCH OF ZION | LONDON | A rating |
| c & s gilligan ltd t/a Subway | GORSEINON | A rating |
| C & S PHARMACY LTD | Preston | A rating |
| C & W (U.K.) LLP | London | A rating |
| C A & K S Goodhill T/a The Glen Hotel | Newtonmore | A rating |
| C A Drillers Ltd | Whitstable | A rating |
| C and K Kooner Cakes Ltd TA THE EGGFREE CAKE BOX | ORPINGTON | A rating |
| C Brandauer and Co Ltd | Birmingham | A rating |
| C Butt Ltd | Northampton | A rating |
| C C G Decorators Ltd | Torquay | A rating |
| C C Hair & Beauty Ltd | Leeds | A rating |
| C De Vision Productions Ltd | Birmingham | A rating |
| C for Consultancy T/A The One World | London | A rating |
| C G HUNDAL CONSTRUCTION LTD | Ashford | A rating |
| C G Utilities Limited | Guilford | A rating |
| C GLOBE TRADERS | New Malden | A rating |
| C Goode Pharmacy | Twickenham | A rating |
| C H EDWARDS | SHREWSBURY | A rating |
| C J Coleman & Company Limited | London | A rating |
| C J Gibbs And Sons | St Osyth | A rating |
| C J Goodwin Ltd | Derby | A rating |
| C J Grant & Partner Limited | Fraserburgh | A rating |
| C J O Shea Group Limited | London | A rating |
| C J Osteopathy Ltd | Sheffield | A rating |
| c j thorne & co ltd | Uckfield | A rating |
| C J, J C & J C Pine | Taunton | A rating |
| C K CONVENIENCE STORE LTD | EASTLEIGH | A rating |
| C K WONG & CO LIMITED | Manchester | A rating |
| C Kaur T/A West End Manse Dental Surgery | Haverhill | A rating |
| C L Llangadfan Ltd t/a Camlins | Shrewsbury | A rating |
| C LIN LIMITED T/A Wok U Like | Reading | A rating |
| C N FOODS DISTRIBUTORS LIMITED | London | A rating |
| C Neil Dowson | Stallingborough | A rating |
| C P W Services Limited | Solihull | A rating |
| C PROJECT LDN LTD T/A COCOTTE | London | A rating |
| C R Down Farming Ltd | Devon | A rating |
| C Saujani Trading as Londis | Chesham | A rating |
| C Sense 24 Limited | Livingston | A rating |
| C Spencer Ltd | Hull | A rating |
| C SQUARED NETWORKS LTD | London | A rating |
| C T Care Ltd | Market Harborough | A rating |
| C the Signs Limited | London | A rating |
| C Toms and Son Ltd | Polruan | A rating |
| C VAP CIC | Glasgow | A rating |
| C VERTY FURNITURE LTD T/A VERTY FURNITURE | Corby | A rating |
| C W Research Limited | Shrewsbury | A rating |
| C Workshop Limited | Borehamwood | A rating |
| C Wzrd Limited | Birmingham | A rating |
| C-Change Scotland | Glasgow | A rating |
| C-Concept Studio Ltd | London | A rating |
| C-Kore Systems Limited | York | A rating |
| C-MART SOLUTIONS LIMITED | London | A rating |
| C-Screens Limited | London | A rating |
| C-Tec London Ltd | Rainham | A rating |
| C. & J. Clark International Limited | Street | A rating |
| C. BECHSTEIN HALL LIMITED | London | A rating |
| C. Hoare & Co. | London | A rating |
| C. P & S Limited | London | A rating |
| C.A. MCMILLAN FINE ARTS LIMITED | London | A rating |
| C.A.A Restaurants Limited | London | A rating |
| C.A.Blackwell (Contracts) Ltd | Durham | A rating |
| C.A.C PALACE OF GRACE MANCHESTER UK | Manchester | A rating |
| C.A.I INTERNATIONAL LTD | Durham | A rating |
| C.A.S.B Limited | Wolverhampton | A rating |
| C.A.UK TOURISM LIMITED | London | A rating |
| C.B. Scotland Limited | LIVINGSTON | A rating |
| C.B.Patel & Partners c/o Hayes Medical Centre | Hayes | A rating |
| C.Carnevale Ltd | London | A rating |
| C.D. Builders Ltd | Surrey | A rating |
| C.D.S. Computer Design Systems Ltd | Salford | A rating |
| C.E.A.TOWNE(SHIP RIGGERS)LIMITED | HULL | A rating |
| C.E.X Limited | London | A rating |
| C.Gars Ltd | London | A rating |
| C.H. Robinson Worldwide (UK) Limited | Slough | A rating |
| C.I.K. Accounting Solutions Ltd | Dundee | A rating |
| C.I.O. SECURITY LIMITED | London | A rating |
| C.J. Martin (Coins) Limited | LONDON | A rating |
| C.K. (FAST FOOD SUPPLIERS) LIMITED | Hull | A rating |
| C.K. Crane (International) Limited | Burton-On-Trent | A rating |
| C.K. Foods (Processing) Ltd | Hull | A rating |
| C.K. RETAIL LTD | Hull | A rating |
| C.M.C. MACHINERY UK LTD | Milton Keynes | A rating |
| C.M.M. Kitchen Ltd T/A Gaze | Belfast | A rating |
| C.P.G. (WALES) LIMITED | Swansea | A rating |
| C.T. Accountants Ltd | South Croydon | A rating |
| C.T.C.H. Ltd | Tewkesbury | A rating |
| C.U.J. Limited | Wakefield | A rating |
| C.V. A.C LIMITED | London | A rating |
| C'DORE VALETING LTD | Wolverhampton | A rating |
| C&A FOOD GROUP LTD | Newport | A rating |
| C&C EXPRESS LTD | WOKING | A rating |
| C&C Restaurant Management Services Limited | London | A rating |
| C&C Textiles Limited | Blackburn | A rating |
| C&D FURNITURE LTD | LONDON | A rating |
| C&D Mechanical Limited | SHEFFIELD | A rating |
| C&D METALWORKS (UK) LIMITED | LONDON | A rating |
| C&H Esher Ltd | Esher | A rating |
| C&M LTD | Blackburn | A rating |
| C&MM LTD | London | A rating |
| C&N Sporting Risk Ltd | London | A rating |
| C&O SLS Limited | Great Dunmow | A rating |
| C&R Design LTD t/a AMA Consulting Engineers | Barnet | A rating |
| C&S Adams | Stranraer | A rating |
| C&S CLEANING LTD | Wolverhampton | A rating |
| C&S Distributions Ltd | Glasgow | A rating |
| C&S Services Ltd T/a The Fiery Grill and Curry | BILSTON | A rating |
| C&S TAKEAWAY LTD | Coventry | A rating |
| C&T Global Trading Limited | Salford | A rating |
| C&U FOOD TO GO LIMITED | Hull | A rating |
| C&W TRANSPORT LIMITED | Upminster | A rating |
| C&Z PIZZACASA LTD | STUDLEY | A rating |
| C1 SOLUTIONS LIMITED | London | A rating |
| C10 STORE LIMITED | Aberdeen | A rating |
| C15 Media Networks Ltd | London | A rating |
| C1947 Ltd T/A Khushis | Edinburgh | A rating |
| C2 Auto Ltd T/A CarSpa | Airdrie | A rating |
| C2 Cyber Ltd | London | A rating |
| C2 Foods Ltd T/A Destination Momo Cafe and Bento | Camberley | A rating |
| C24 HEALTHCARE LTD | Oldham | A rating |
| C2B2 Consulting Ltd | Malvern | A rating |
| C2FO Ltd | London | A rating |
| C2H6O LTD T/A Baker Street | Preston | A rating |
| C2SKY CARGO LIMITED | Bolton, | A rating |
| C2X LTD | London | A rating |
| C3 BIO-TECHNOLOGIES LIMITED | Lancaster | A rating |
| C3 Media Limited | Bristol | A rating |
| C4 Carbides Limited | Newmarket | A rating |
| C4 Care Limited | Vale Road, Stockport | A rating |
| C4 Projects Limited | Warrington | A rating |
| C40 Cities Climate Leadership UK | London | A rating |
| C4X Discovery | Manchester | A rating |
| C5 Capital | London | A rating |
| C6 Digital Ltd | London | A rating |
| C8 Consulting Ltd | Reading | A rating |
| C9 LETTING SERVICES LIMITED TA Cloud9 Estate Agents | Coventry | A rating |
| CA AUTO FINANCE UK LTD | SLOUGH | A rating |
| CA Group Ltd | Bishop Auckland | A rating |
| Ca Va Bar & Brasserie Limited | Glasgow | A rating |
| CAA Base Limited | London | A rating |
| CAA DRY CLEANERS & LAUNDRETTE LTD | London | A rating |
| CAA ICON UK Limited | London | A rating |
| CAA Sports UK Limited | London | A rating |
| Caafi Health CIC | Bristol | A rating |
| CAAL LIMITED | Wembley | A rating |
| CAB Automotive Limited | Tipton | A rating |
| Cab Management System Ltd | Greenford | A rating |
| CAB People Ltd | Dewsbury | A rating |
| Cabbages & Condoms UK Ltd. | Bicester | A rating |
| Cabco Ltd | Newbury | A rating |
| Cabelo Adore | York | A rating |
| Cabin Edit Limited | London | A rating |
| CABINAT LIMITED | CHISWICK | A rating |
| Cabinet Bits Ltd | St Leonards on Sea | A rating |
| Cabinet Masters North West LTD | Wigan | A rating |
| Cabinet Office | London | A rating |
| Cabintec Ltd | Dungan | A rating |
| CABIPA LIMITED | Southampton | A rating |
| CABLE AND DEVICES UK LIMITED | London | A rating |
| Cable and Splicing Services Limited | Stratford-upon-Avon | A rating |
| Cable Coatings Limited | Batley | A rating |
| Cable Detection Limited | Stoke on Trent | A rating |
| Cable Management Warehouse Ltd | Bedford | A rating |
| CABLEWORLD LIMITED | Bolton | A rating |
| CABNETIC LTD | London | A rating |
| Cabot Carbon Ltd | Sully | A rating |
| Cabot Communications Ltd | Bristol | A rating |
| Cabot Highlands LLP | Inverness | A rating |
| Cabot Learning Federation | Bristol | A rating |
| Cabot Partners Limited | London | A rating |
| Cabot UK Holdco Limited | Kent | A rating |
| Cabvision Network Limited | London | A rating |
| CABX SERVICES LTD | London | A rating |
| CABZONE LTD | Worcester | A rating |
| CAC EUROPE Ltd | London | A rating |
| CAC KINGSWELL MANCHESTER | Manchester | A rating |
| CAC SIA | WALTON ON THAMES | A rating |
| CAC SKILLS DEVELOPMENT CENTRE | CUMBERNAULD | A rating |
| Cacao Bean Restaurant Limited | Herts | A rating |
| Cacao Catering & Events Limited | London | A rating |
| CACEIS Bank UK Branch | London | A rating |
| Cache Net IT Limited | Redhill | A rating |
| CACI Limited | London | A rating |
| CACTUS COMMUNICATIONS LIMITED | LONDON | A rating |
| Cactus Crew Ltd | Luton | A rating |