| Cambridge Associates Limited | London | A rating |
| Cambridge Consultants Limited | Cambridge | A rating |
| Cambridge Display Technology Ltd | Godmanchester | A rating |
| Cambridge Mechatronics Ltd | Cambridge | A rating |
| Cambridge University Press & Assessment | Cambridge | A rating |
| Camcode Global Limited | Bristol | A rating |
| Cameron Flow Control Technology (UK) Limited | Crawley | A rating |
| Camira Fabrics Limited | Mirfield | A rating |
| Campaign Monitor Europe UK Ltd | London | A rating |
| Campbell Johnston Clark Limited | London | A rating |
| Campbell Scientific Limited | Loughborough | A rating |
| Campus Living Villages UK Ltd | Manchester | A rating |
| Camso UK Limited | Cowbridge | A rating |
| CAN OFFSHORE LIMITED | ABERDEEN | A rating |
| Canaccord Genuity Limited | London | A rating |
| Canada Pension Plan Investment Board | London | A rating |
| Canadian Broadcasting Corporation | London | A rating |
| Canadian Imperial Bank of Commerce | London | A rating |
| Canadian Solar SSES (UK ) Ltd | London | A rating |
| CANADIAN SOLAR UK PROJECTS LTD | London | A rating |
| Canaletto UK Ltd | London | A rating |
| Canalys Com Ltd | READING | A rating |
| Canara Bank | London | A rating |
| Cancer Research UK | London | A rating |
| Candriam Luxembourg - UK Establishment | London | A rating |
| Candu Labs Limited | London | A rating |
| Canon (UK) Ltd | Hayes | A rating |
| Canon Europe Limited | Uxbridge | A rating |
| Canon Medical Research Europe Ltd | Edinburgh | A rating |
| Canopius Services Limited | London | A rating |
| CANPACK UK Limited | Scunthorpe | A rating |
| Cantillon Capital Ltd | London | A rating |
| Canuck Capital Limited | London | A rating |
| CANVA UK OPERATIONS LIMITED | LONDON | A rating |
| Canyon Capital Advisors (Europe) Ltd | London | A rating |
| Capchase UK Limited | London | A rating |
| Capgemini UK PLC | London | A rating |
| Capi Money UK Ltd | London | A rating |
| Capita Plc | London | A rating |
| Capita Property and Infrastructure Ltd | London | A rating |
| Capital Com (UK) Limited T/A Capital.Com | London | A rating |
| Capital Dynamics Ltd. | London | A rating |
| Capital Economics Ltd | London | A rating |
| Capital International Limited | London | A rating |
| Capital Markets Elite Group (UK) Limited | London | A rating |
| Capital Markets Trading UK LLP | London | A rating |
| CAPITAL ONE (EUROPE) PLC | Nottingham | A rating |
| Capitalise.com Platform Limited | London | A rating |
| Capri Healthcare Ltd | Birmingham | A rating |
| Capricorn Energy PLC | Edinburgh | A rating |
| Capricorn Studios Ltd | London | A rating |
| Capricorn Wealth Management Limited | London | A rating |
| CapRock UK Limited | Aberdeen | A rating |
| CAPSPIRE UK | London | A rating |
| Capstone Research Limited | London | A rating |
| Capstone Investment Advisors (UK) LLP | London | A rating |
| Capstone Life Sciences LLP | Radlett WD7 7DQ | A rating |
| Captiv8 Europe Limited | London | A rating |
| Capula Investment Services Limited | London | A rating |
| Caravela Limited | London | A rating |
| CARBON CLEAN SOLUTIONS LIMITED | London | A rating |
| Cardinal Health U.K. 432 Limited | Leeds | A rating |
| Cardlytics UK Limited | London | A rating |
| Cardtronics UK Limited | Dundee | A rating |
| CARE International UK | London | A rating |
| CareerBuilder UK Ltd | London | A rating |
| Caresoft Global Limited | Basildon | A rating |
| Carfax Educational Consultants Limited | Wantage | A rating |
| Cargill PLC | London | A rating |
| CarGurus UK Limited | Wokingham | A rating |
| Carl Zeiss Limited | Cambourne | A rating |
| Carlsberg Marston's Brewing Company Ltd | Wolverhampton | A rating |
| Carlsquare Ltd | London | A rating |
| CARMENTA TECHNOLOGIES LTD | London | A rating |
| Carnival Plc | Southampton | A rating |
| Carrier Solutions UK Ltd | London | A rating |
| Cartesian Limited | London | A rating |
| CARTUS LIMITED | Swindon | A rating |
| Carus Animal Health Limited | Reigate | A rating |
| CarVal Investors UK Limited | London | A rating |
| Casbah Group Limited | London | A rating |
| Cascade Parent Limited | London | A rating |
| Case International, LLC | London | A rating |
| Cashdash UK Limited | London | A rating |
| Casio Electronics Co Limited | Wembley | A rating |
| Cast Connex UK Limited | London | A rating |
| Casterbridge Tours Limited | London | A rating |
| Castlelake (UK) LLP | London | A rating |
| Castlepoint Systems Limited | Orpington | A rating |
| Castleton Commodities UK Limited | London | A rating |
| Cat Tech Europe Limited | Scunthorpe | A rating |
| Catalan Tourist Board UK and Ireland Limited | London | A rating |
| Catalent Micron Technologies Limited | Dartford | A rating |
| Catalent Nottingham Limited | Nottingham | A rating |
| Catalent UK Swindon Zydis LTD | Swindon | A rating |
| Catalina Marketing UK | Notting Hill | A rating |
| Catalina Services UK Limited | Worthing | A rating |
| Catalonia Trade & Investment London Limited | London | A rating |
| Catalyst IT Europe Limited | Brighton | A rating |
| Catapult Sports Limited | Leeds | A rating |
| Caterpillar UK Holdings Limited | Leicester | A rating |
| Cathay Pacific Airways Ltd | Hammersmith | A rating |
| Caudalie Group Limited | London | A rating |
| Causaly Ltd | London | A rating |
| Causeway Technologies Ltd | Gerrards Cross | A rating |
| Cawood Scientific Limited | Bracknell | A rating |
| Caygan Capital Ltd | London | A rating |
| CB Payments Ltd | London | A rating |
| CBee (Europe) Limited | Richmond | A rating |
| Cboe Clear Europe N.V. (London Branch) | London | A rating |
| Cboe Europe B.V. | London | A rating |
| Cboe Europe Limited | London | A rating |
| Cboe UK Limited | London | A rating |
| CBRE Limited | London | A rating |
| CC Land Management and Consultancy UK Limited | London | A rating |
| CC MANAGEMENT CONSULTING LTD | Hornchurch | A rating |
| CCBI Global Markets (UK) Limited | London | A rating |
| CCCU-UK | Oxford | A rating |
| CCIC London Company Limited | London | A rating |
| CCL Stressing International Limited | Leeds | A rating |
| CCR Motor Co. Ltd. | Pontypridd | A rating |
| CD&R LLP | London | A rating |
| CDD Automation Solutions Ltd | Peterborough | A rating |
| CDE Entertainment limited | Goring | A rating |
| CDE Global Limited | Cookstown | A rating |
| CDL CHOCOLATE LTD CDY | London | A rating |
| CDPQ London LLP t/a La Caisse | London | A rating |
| CDW Limited | London | A rating |
| CE Europe Ltd | Hammersmith | A rating |
| Ceasefire Industries U.K. Limited | Birmingham | A rating |
| CECP ADVISORS LLP | LONDON | A rating |
| Cederberg Capital Ltd | London | A rating |
| Cedo Limited | Telford | A rating |
| CEI GLOBAL UK LTD | London | A rating |
| Celanese Services UK Ltd | Derby | A rating |
| Celcom Solutions Ltd | Reading | A rating |
| CELEBAL TECHNOLOGIES UK LTD | Harrow | A rating |
| Celebe London ltd | NEW MALDEN | A rating |
| CELFINET UK TELECOMMUNICATIONS CONSULTING SERVICES LTD | NEWBURY | A rating |
| Cellebrite UK Limited | London | A rating |
| Celltrion Healthcare United Kingdom Limited | Uxbridge | A rating |
| Celonis Ltd | London | A rating |
| Celtra Limited | London | A rating |
| Cemex UK Operations Limited | Coventry | A rating |
| CEMP UK | London | A rating |
| CEMPLICITY UK LIMITED | London | A rating |
| Ceniarth (UK) Ltd | London | A rating |
| Centaur Services Limited | Castle Cary | A rating |
| Center for Creative Leadership Ltd | Ilford | A rating |
| Center for Global Development Europe | London | A rating |
| Centerbridge Partners Europe, LLP | London | A rating |
| Centerview Partners UK LLP | London | A rating |
| Centiva Capital UK Ltd | London | A rating |
| Central Bank of the Republic of China (Taiwan) | London | A rating |
| Central Health London LLP | London | A rating |
| Central Japan Railway Company | London | A rating |
| CentralNic Group Plc | London | A rating |
| Centre for Finance, Technology and Entrepreneurship Ltd | London, | A rating |
| Centre People Appointments Limited | London | A rating |
| Centric Brands International Europe | London | A rating |
| Centrica plc | Windsor | A rating |
| Centro Asset Management Limited | London | A rating |
| CENTRUM (UK) Ltd | London | A rating |
| Centrus Financial Advisors Limited | London | A rating |
| Cepheid UK Limited | High Wycombe | A rating |
| Ceramex Ltd | Reading | A rating |
| CeramTec UK Limited | Southampton | A rating |
| Cerberus European Capital Advisors LLP | London | A rating |
| Cereal Partners UK | Welwyn Garden City | A rating |
| Cerealto UK Limited | Nottinghamshire | A rating |
| Cerelia UK Ltd (Trading as BakeAway) | Corby | A rating |
| Cerillion Technologies Limited | London | A rating |
| Ceros Crowd Fusion, Ltd | County Antrim | A rating |
| Certara UK Limited | Sheffield | A rating |
| Certified Collectibles Group - International UK Limited | London | A rating |
| CERTINIA UK LIMITED | Harrogate | A rating |
| CERTORA SMART CONTRACTS UK LTD. | London | A rating |
| Cerulli Associates Europe Ltd | London | A rating |
| Cervello Limited | London | A rating |
| Ceva Animal Health Limited | Wooburn Green | A rating |
| Ceva Logistics Limited | Ashby-de-la-Zouch | A rating |
| CEWE Limited | Warwick | A rating |
| CF Fertilisers UK Limited | Chester | A rating |
| CF Private Equity U.K. Limited | London | A rating |
| CFA Institute | London | A rating |
| CFGI (UK) Limited | London | A rating |
| CFH CAPITAL (UK) LIMITED | LONDON | A rating |
| CGG Services (UK) Ltd | Crawley | A rating |
| CGN Global Uranium Ltd. | Cambridge | A rating |
| CH Carolina Herrera | London | A rating |
| Chadwicks of Bury Ltd | Bury | A rating |
| Chain IQ UK Limited | London | A rating |
| Chainalysis UK Limited | London | A rating |
| Challenge Group Brokers (UK) Ltd | London | A rating |
| Challenger Performance Optimization UK Limited | London | A rating |
| Chambertin Capital Limited | Manchester | A rating |
| CHAMP Cargosystems (UK) Ltd | Reading | A rating |
| CHAMPION TECHNOLOGIES LIMITED | ABERDEEN | A rating |
| Chandlers Garage Holdings Limited | Kent | A rating |
| Chanel Limited | London | A rating |