| Claw Nuclear Services Ltd | Extraterritorial | 2014 |
| Claw Remediation Services Ltd | Extraterritorial | 2014 |
| Claymaker Media Ltd | Professional & scientific | 2025 |
| Clayton Stewart Ltd | Professional & scientific | 2018 |
| Clayton Stewart Properties Ltd | Hospitality | 2021 |
| Cldcompany Ltd | Hospitality | 2024 |
| Clearcom INV LLP | | 2017 |
| Clearcom Properties Ltd. | Households | 2001 |
| Clearscope Commercial Ltd | Professional & scientific | 2024 |
| Clearwater Property Company Limited | Real estate | 1960 |
| Clearwater Property Estates Limited | Financial services | 2014 |
| Clemebil Limited | Construction | 2019 |
| Cleriche Ltd | Wholesale & retail | 2025 |
| Clermont Energy Consulting Limited | Professional & scientific | 2002 |
| Cleve Place Residents Company Limited | Households | 2013 |
| Clever IT Limited | Information & communication | 2011 |
| Cleves Academy Trust | Education | 2010 |
| CLG Limited | Health & social care | 2014 |
| Clickzone Limited | Information & communication | 2026 |
| Climate Antidote Ltd. | Professional & scientific | 2024 |
| Climatise Technology Limited | Administrative & support | 2024 |
| Clinton Close (Weybridge) Limited | Households | 2001 |
| Clipe Ltd | Real estate | 2025 |
| Closer Pets Ltd | Manufacturing | 2021 |
| Cloudmae Limited | Information & communication | 2024 |
| CMG Consultancy Limited | Professional & scientific | 2025 |
| CNC Routing Limited | Manufacturing | 2005 |
| Coast and Castle Limited | Real estate | 2017 |
| Cobham Montessori School Limited | Education | 2013 |
| Cobham Property Group Limited | Construction | 2017 |
| Cobird Limited | Professional & scientific | 1997 |
| Cockrobin Creative Limited | Arts & recreation | 2025 |
| Cocktail Production Ltd | Information & communication | 2012 |
| Coco Nails & Beauty Limited | Other services | 2015 |
| Cocoa Designs Ltd | Professional & scientific | 2018 |
| Cocorra Ltd | Wholesale & retail | 2011 |
| Codesign IT Solutions Ltd | Information & communication | 2020 |
| Coeden Timber Limited | Wholesale & retail | 2018 |
| Coffee a G Limited | Administrative & support | 2008 |
| Cokox Limited | Wholesale & retail | 2025 |
| Colagn Limited | Health & social care | 2021 |
| Coldpalmer Ltd | Wholesale & retail | 2024 |
| Cole Capital Consultancy Limited | Professional & scientific | 2009 |
| Colehill Kitchen Ltd | Manufacturing | 2017 |
| Colin Barber Limited | Professional & scientific | 1995 |
| Collbeg Ltd | Real estate | 2016 |
| Collblanc Ltd | Manufacturing | 2024 |
| Collette Cafferty Finance Ltd | Professional & scientific | 2025 |
| Collins Automation Limited | Information & communication | 2000 |
| Colouration Limited | Manufacturing | 2001 |
| Coloured Ribbons Limited | Health & social care | 2019 |
| Column Associates Ltd | Administrative & support | 2020 |
| Commodities Brain Limited | Energy | 2023 |
| Complete Care Services (Rossendale) Ltd | Health & social care | 1998 |
| Complete Coachwork Solutions Limited | Wholesale & retail | 2013 |
| Computer Support and Repair UK Limited | Other services | 2020 |
| Concept Developments (Chilworth) Ltd | Extraterritorial | 2015 |
| Concept Developments (Cobham) Limited | Construction | 2007 |
| Concept Developments (Dormansland) Limited | Professional & scientific | 2019 |
| Concept Developments (Land) Limited | Construction | 2016 |
| Concept Eight Architects Ltd | Professional & scientific | 2006 |
| Concept Eight Design Limited | Professional & scientific | 2013 |
| Concept Holdings (Surrey) Limited | Financial services | 2016 |
| Concept Homes (Surrey) Limited | Administrative & support | 2011 |
| Concept Homes (Walton) Ltd | Extraterritorial | 2014 |
| Concurrent Design Limited | Professional & scientific | 2001 |
| Conder Environmental Solutions Ltd | Water & waste | 1969 |
| Condor Technologies Limited | Manufacturing | 2005 |
| Connect Live (UK) Ltd | Professional & scientific | 2009 |
| Connect Live Associates Limited | Extraterritorial | 2026 |
| Connect Live Limited | Financial services | 2018 |
| Connected Asset Management Limited | Financial services | 2017 |
| Connected Habitat Limited | Financial services | 2023 |
| Connector Unit Limited | Administrative & support | 2016 |
| Connectplaywise Ltd | Information & communication | 2024 |
| Conroy Customer Management Services Limited | Professional & scientific | 2010 |
| Conservative Business Network Limited | Administrative & support | 2022 |
| Constans Ltd | Information & communication | 2026 |
| Consumer Healthcare Holdings Limited | Financial services | 2019 |
| Consumer Healthcare Intermediate Holdings Limited | Financial services | 2019 |
| Contalise Ltd | Real estate | 2024 |
| Continental Real Estate Solutions Ltd | Real estate | 2018 |
| Contour Decor Ltd | Construction | 2014 |
| Contoured Solutions Ltd | Administrative & support | 2021 |
| COO Concepts Limited | Hospitality | 2021 |
| Cookmere Ltd | Hospitality | 2022 |
| Cooper Safety Associates LLP | | 2009 |
| Cooperhill-Properties Limited | Construction | 2014 |
| Coopers of Goodwood Limited | Administrative & support | 2022 |
| Coordesign Ltd | Professional & scientific | 2024 |
| Coorhomes Ltd | Real estate | 2025 |
| Cope Group Limited | Construction | 2020 |
| Copeland Group Limited | Financial services | 2025 |
| Copeland Real Estates Ltd | Real estate | 2022 |
| Copse Mews Properties Limited | Real estate | 2017 |
| COR FM Ltd | Administrative & support | 2013 |
| Core Business Development Limited | Professional & scientific | 2017 |
| Core Globe Ltd | Real estate | 2020 |
| Corncrake Limited | Financial services | 2014 |
| Cornelian Weybridge Limited | Hospitality | 2025 |