| Changan UK R & D Centre Limited | Birmingham | A rating |
| Change.org Worldwide Limited | London | A rating |
| Changepond Technologies Private Limited | Harrow | A rating |
| Changhwa Commercial Bank Ltd | London | A rating |
| CHANNEL FACTORY EUROPE LIMITED | London | A rating |
| Channel Global Ltd | London | A rating |
| Channelscaler UK Limited | London | A rating |
| Chapman Freeborn Airchartering Ltd | Gatwick | A rating |
| chapmanbdsp | London | A rating |
| Chargepoint Network (UK) Ltd | London | A rating |
| Charles & Keith (UK) Limited | London | A rating |
| Charles Kendall Group Limited | London | A rating |
| Charles Marcus Group Services Ltd | Fareham | A rating |
| CHARLES RIVER LABORATORIES EDINBURGH LIMITED | EAST LOTHIAN | A rating |
| CHARLES RUSSELL SPEECHLYS LLP | LONDON | A rating |
| Charles Taylor Limited | London | A rating |
| Charter Kontron Ltd | Milton Keynes | A rating |
| Chartwell Consulting Ltd | London | A rating |
| Chase Software Solutions Ltd | Surbiton | A rating |
| Chatham Financial Europe Ltd | London | A rating |
| Chaucer Syndicates Limited | London | A rating |
| CHC TECH LIMITED | Norwich | A rating |
| CHECKOUT LTD | London | A rating |
| CHEIL EUROPE LTD | London | A rating |
| Chelsea Hospital Limited T/A Memorial Houston Medical | London | A rating |
| Chelton Limited | Marlow | A rating |
| Chemonics Group UK Limited | London | A rating |
| CHEMOXY INTERNATIONAL LIMITED | Middlesbrough | A rating |
| Chemring Group PLC | Romsey | A rating |
| Chemviron Carbon Limited | Ashton in Makerfield | A rating |
| Chenavari Financial Group Ltd | London | A rating |
| Cheniere Marketing Ltd | London | A rating |
| CHEP UK Ltd | Weybridge | A rating |
| CHERRY VALLEY FARMS LIMITED | Grimsby | A rating |
| Chetu Ltd | Birmingham | A rating |
| Chevron Aircraft Maintenance | Manchester | A rating |
| Chevron Energy Limited | London | A rating |
| Chicago Mercantile Exchange (CME) | London | A rating |
| Chick-fil-A (UK) Limited | London | A rating |
| Chiesi Limited | Manchester | A rating |
| Chikara Investments LLP | London | A rating |
| Chile Copper Limited | London | A rating |
| Chilton Investment Company Limited | London | A rating |
| Chime Communications Limited | London | A rating |
| China Airlines Ltd | London | A rating |
| China Aviation Fuel (Europe) Limited | London | A rating |
| China Cargo Airlines Limited | Stansted | A rating |
| China CITIC Bank Corporation Limited | London | A rating |
| China Classification Society | London | A rating |
| China Construction Bank Corporation London Branch | London | A rating |
| China Construction UK Limited | London | A rating |
| China Council for the Promotion of International Trade Representative Office in the UK | London | A rating |
| China Development Bank London Representative Office | London | A rating |
| China Eastern Airlines Corporation Limited | London | A rating |
| China Global Television Network Europe Ltd. | London | A rating |
| China Holidays Ltd | London | A rating |
| China International Capital Corporation (UK) Limited | London | A rating |
| China Investment Corporation London Representative Office | London | A rating |
| China Life Investment Management Company Limited U.K. Representative Office | London | A rating |
| China Merchants Bank Co., Ltd. | London | A rating |
| China Merchants Securities (UK) Limited | London | A rating |
| CHINA MINSHENG BANKING CORPORATION LIMITED LONDON BRANCH | LONDON | A rating |
| China Mobile International (UK) Limited | London | A rating |
| China National Publications Import & Export Corporation London Office | London | A rating |
| China National Tourist Office | London | A rating |
| China Petroleum & Chemical Corporation | LONDON | A rating |
| China Re Underwriting Agency Limited | London | A rating |
| China Southern Airlines Company Limited | Hounslow | A rating |
| China Taiping Insurance (UK) Co Ltd | London | A rating |
| China Telecom (Europe) Ltd. | London | A rating |
| China Unicom (Europe) Operations Limited | London | A rating |
| Chiplogic Technologies Limited | Maidenhead | A rating |
| Chipotle Mexican Grill UK Limited | London | A rating |
| Chisl Ltd | London | A rating |
| Chivas Brothers International Limited | London | A rating |
| Chivas Brothers Ltd | London | A rating |
| Chopstix Restaurant Ltd | London | A rating |
| Christian Aid | London | A rating |
| Christian Dior UK Limited | LONDON | A rating |
| Christie Digital Systems Canada Inc. | Wokingham | A rating |
| Christie, Manson & Woods Limited | London | A rating |
| Chromalloy United Kingdom Ltd | Alfreton, | A rating |
| Chronomics | London | A rating |
| CHT UK BRIDGWATER LTD | Somerset | A rating |
| Chubb Services UK Limited | London | A rating |
| Chubu Electric Power Co., Inc. | London | A rating |
| Chugai Pharma Europe Ltd | London | A rating |
| Chugoku Paints (UK) Ltd | London | A rating |
| Church and Dwight UK Ltd | Folkestone | A rating |
| Churchill Group Ltd | London | A rating |
| Ci&T UK Limited | London | A rating |
| CIB Representative Office London | London | A rating |
| CIBT UK Ltd | London | A rating |
| Cielo Talent Ltd | London | A rating |
| Ciena Limited | London | A rating |
| CIFC Asset Management Europe Ltd | London | A rating |
| CIGNA EUROPEAN SERVICES (UK) LIMITED | Glasgow | A rating |
| Cigniti Technologies (UK) Limited | London | A rating |
| Ciklum Operations UK Limited | London | A rating |
| CIL Strategy Consultants | London | A rating |
| CIMB Bank Berhad | London | A rating |
| Cimcon Software (UK) Limited | Reading | A rating |
| Cimcorp UK Ltd | Warwick | A rating |
| Cimolai (UK) Ltd | London | A rating |
| Cimpress (UK) Limited | London | A rating |
| Cineflix Rights Limited | London | A rating |
| Cinegy Ltd | Bristol | A rating |
| Cineworld Cinemas Limited | Brentford | A rating |
| Cinven Limited | London | A rating |
| CIP FS UK LTD. | Rotherham | A rating |
| CIP LONDON LIMITED | London | A rating |
| CIP PLATFORM SOLUTIONS UK LTD. | Rotherham | A rating |
| CIP TERRA TECHNOLOGIES UK LTD. | Rotherham | A rating |
| Cipla (EU) Limited | Addlestone | A rating |
| Circet UK limited | Slough | A rating |
| Circle UK Trading Ltd | London | A rating |
| CircleCi UK Limited | London | A rating |
| Cirrus Logic International Semiconductor Limited | Edinburgh | A rating |
| Cirrus Nexus Ltd | London | A rating |
| CIS London & Partners LLP | London | A rating |
| Cisco International Limited | Cardiff | A rating |
| CISDI UK LTD | SHEFFIELD | A rating |
| Cision Group Limited | London | A rating |
| Citadel Enterprise Europe Limited | London | A rating |
| Citi Group | London | A rating |
| Citisoft, Inc. UK | London | A rating |
| CitiusTech Healthcare Technology Pvt. Ltd | New Denham, Uxbridge | A rating |
| Citizen Machinery UK Ltd | Bushey | A rating |
| City Executive Consultants Limited | London | A rating |
| City Football Group Limited | Manchester | A rating |
| Civic Studios International Limited | London | A rating |
| Civica UK Ltd | London | A rating |
| Civinity Engineering UK Ltd | Gillingham | A rating |
| CJ Foods Sales UK, Ltd | London | A rating |
| CKI Gas Infrastructure Limited | London | A rating |
| CL & Co Management Services Limited | LONDON | A rating |
| CL Tech UK Limited | Southampton | A rating |
| CLAAS UK Limited | Bury St Edmunds | A rating |
| Claimsorted Ltd | London | A rating |
| Claranet Ltd | London | A rating |
| Clarastra UK Limited | London | A rating |
| Clarasys Limited | London | A rating |
| CLARI UK LIMITED | CHELTENHAM | A rating |
| Clarion Events Ltd | London | A rating |
| Clarios UK Limited | Watford | A rating |
| Claritas HealthTech Ltd | London | A rating |
| Clarivate Analytics (UK) Limited | London | A rating |
| Clarke Energy Ltd | Liverpool | A rating |
| Clarksons PLC | London | A rating |
| Claroty (UK) Limited | London | A rating |
| CLASS TECHNOLOGY SOLUTIONS LTD | Horsham | A rating |
| Classical Numismatic Group LLC | London | A rating |
| Clay Labs UK Ltd | London | A rating |
| CLdN Ports Killingholme Ltd | North Killingholme | A rating |
| Cleantech Group Europe Limited | London | A rating |
| Clear Ideas Consultancy LLP | London | A rating |
| Clear Sky Capital UK Limited | London | A rating |
| Clear Street Services UK Limited | London | A rating |
| ClearBank Group Holdings Limited | London | A rating |
| ClearPoint Neuro UK Ltd | Guildford | A rating |
| Clearroute UK Limited | London | A rating |
| Clearsense Ventures Limited | London | A rating |
| ClearSpace Today Ltd | London | A rating |
| Clearsulting Ltd | London | A rating |
| Clearview Healthcare Partners (UK) Limited | London | A rating |
| Clearwater Analytics, Ltd. | Edinburgh | A rating |
| Clearwater Corporate Finance LLP | Birmingham | A rating |
| Cleary Gottlieb Steen & Hamilton LLP | London | A rating |
| Clece Care Services Ltd | London | A rating |
| Clemessy UK Ltd | Bristol | A rating |
| Clermont Hotel Management Limited | London | A rating |
| CLES Resources Limited | Richmond | A rating |
| Cleveland Clinic London Ltd | Belgravia | A rating |
| Cleveland Potash Ltd | Saltburn-by-the-Sea | A rating |
| CLFIS (UK ) Ltd - Canada Life | London | A rating |
| Click Entertainment LTD | Croydon | A rating |
| ClickView Limited | London | A rating |
| ClientEarth | London | A rating |
| Clifford Chance LLP | London | A rating |
| Climate Impact X PTE. LTD. (London Branch) | London | A rating |
| Climate-KIC Holding B.V.(UK Branch) | London | A rating |
| Climax Molybdenum UK Ltd | Stowmarket | A rating |
| CLINCHOICE LIMITED | Slough | A rating |
| Clinical Outcomes Solutions Limited | Folkstone | A rating |
| Clinisupplies Limited | Watford | A rating |
| Clinuvel (UK) Ltd | Leatherhead | A rating |
| Clipway Limited | London | A rating |
| Clivedale Ventures Limited | London | A rating |
| CLOBOTICS UK LTD | London | A rating |
| Cloud Capital LLP | London | A rating |
| Cloud Imperium Games Limited | Manchester | A rating |
| Cloud Lending UK Ltd | London | A rating |
| Cloud SG UK Ltd | London | A rating |
| CloudBees UK Limited | London | A rating |
| Cloudera (UK) Limited | London | A rating |
| CloudFactory International Limited | Reading | A rating |
| Cloudflare Limited | London | A rating |
| CloudHQ UK Limited | London | A rating |
| Cloudinary UK Limited | London | A rating |
| CloudPay Technology Limited | Andover | A rating |