| Catherine Place Management Company Limited | Households | 2001 |
| Cato and Veil Limited | Professional & scientific | 2020 |
| Causarma Limited | Professional & scientific | 2014 |
| Cavalca Limited | Professional & scientific | 2015 |
| Cavalho Shipping and Removal Limited | Transport & logistics | 2017 |
| Cavendish & Portman Properties Ltd | Real estate | 2019 |
| Cavendish Court Residents Limited | Households | 1996 |
| Cavendish Place (Bournemouth) Management Limited | Households | 1986 |
| Cavernbest Limited | Real estate | 1991 |
| Caversham Partners Limited | Professional & scientific | 2018 |
| Cayenne Limited | Professional & scientific | 2017 |
| CB Brent Cross Limited | Wholesale & retail | 2025 |
| CB Distributions Ltd | Wholesale & retail | 2019 |
| CB Queensway Ltd | Wholesale & retail | 2024 |
| CB Westfield Limited | Wholesale & retail | 2025 |
| Cback Limited | Wholesale & retail | 2013 |
| Cban Tech Limited | Information & communication | 2026 |
| Cbarbetas Limited | Wholesale & retail | 2020 |
| Cbcw Limited | Wholesale & retail | 2025 |
| CBM Maintenance Ltd | Construction | 2025 |
| CBR SPV Limited | Real estate | 2022 |
| CBT Investments Ltd | Financial services | 2024 |
| CBV Construction Limited | Construction | 2019 |
| CC Control & Security Ltd | Construction | 2022 |
| CC ME Marketing Solutions Ltd | Information & communication | 2024 |
| CC Sourcing & Services Limited | Construction | 2021 |
| CCH Financial Strategies Limited | Financial services | 2003 |
| CCH Limited | Administrative & support | 1998 |
| CCH Live Limited | Other services | 2017 |
| CCH Nominees Limited | Professional & scientific | 2000 |
| CCJ Pubs Limited | Hospitality | 2026 |
| CCL Build Ltd | Other services | 2021 |
| CCL Construction Limited | Construction | 2020 |
| CCP Cons Ltd | Construction | 2018 |
| CCR Construction Ltd | Construction | 2017 |
| CCR Foundation | Wholesale & retail | 2012 |
| CCR Hire Limited | Administrative & support | 2019 |
| CCR Insurance Brokers Limited | Administrative & support | 1994 |
| Ccsi Investments Ltd | Real estate | 2024 |
| CD Electric Services Ltd | Construction | 2023 |
| CD Homes Investments Limited | Real estate | 2019 |
| CD Homes Management Ltd | Real estate | 2015 |
| CD Lighting Limited | Information & communication | 2013 |
| CDF Renewal Ltd | Construction | 2019 |
| Cdit Ltd | Professional & scientific | 2022 |
| Cdjg Ltd | Construction | 2025 |
| CDM Building Services Ltd | Manufacturing | 2024 |
| CDM Electrical London Ltd | Construction | 2025 |
| CDS Direct Ltd | Professional & scientific | 2020 |
| CDS Properties Direct Ltd | Real estate | 2024 |
| CDT Engineering Services Ltd | Construction | 2019 |
| CDV Construction Group Ltd | Construction | 2025 |
| Cdwl Subsidiary Limited | Construction | 2023 |
| Cecari Limited | Extraterritorial | 2011 |
| Cedar Ashford Limited | Wholesale & retail | 2019 |
| Cedar Gate Holdings Limited | Real estate | 2025 |
| Cedar Heights Consultancy Ltd. | Professional & scientific | 2023 |
| Cedar Lawn Romsey Limited | Health & social care | 2024 |
| Cedar Smiles Ltd | Health & social care | 2021 |
| Cedarcare Limited | Construction | 1985 |
| Cedrex Investments Limited | Real estate | 2020 |
| Cedrus Services Ltd | Construction | 2021 |
| Ceejay Europe Limited | Real estate | 2019 |
| Ceejay Holdings Limited | Real estate | 2020 |
| Ceejay One Limited | Real estate | 2020 |
| Ceejay Travel Limited | Administrative & support | 2004 |
| Ceekko Health Limited | Health & social care | 2021 |
| Celebal Technologies UK Ltd | Information & communication | 2023 |
| Celebration Event & Management Ltd | Administrative & support | 2025 |
| Celebrations by Shree Venilal's Limited | Wholesale & retail | 2012 |
| Celebrity Films International Limited | Information & communication | 2020 |
| Celeste Finds Ltd | Wholesale & retail | 2025 |
| Celestial AI Agents Ltd | Information & communication | 2025 |
| Celine Basanisi Gilg & Associates Ltd | Wholesale & retail | 2024 |
| Celine Travel Executive Ltd | Transport & logistics | 2018 |
| Cellar Rats Limited | Professional & scientific | 2022 |
| Cellecor Gadgets Europe Limited | Financial services | 2026 |
| Celosia Investments GB Ltd | Financial services | 2023 |
| Celosia RK Ltd | Real estate | 2023 |
| Celpanova Ltd | Professional & scientific | 2022 |
| Celutions Limited | Information & communication | 2011 |
| Cement Plus UK Limited | Construction | 2024 |
| Cenalija Transport Ltd | Transport & logistics | 2024 |
| Ceni Builders Ltd | Other services | 2014 |
| Cent.Creative Limited | Professional & scientific | 2022 |
| Cent.Ldn Ltd | Manufacturing | 2020 |
| Centaur Business Systems (UK) Ltd | Information & communication | 2020 |
| Centaur Consulting Services Ltd | Financial services | 2020 |
| Centaur Tech Services Ltd | Information & communication | 2019 |
| Centillion Assets Ltd | Real estate | 2017 |
| Central and Tryon RTM Company Limited | Households | 2025 |
| Central Cafe Hartlepool Ltd | Hospitality | 2022 |
| Central Cash and Carry (Watford) Limited | Wholesale & retail | 1994 |
| Central Harrow Homes Ltd. | Real estate | 2017 |
| Central Link Properties Limited | Construction | 1996 |
| Central Print & Binding Services Ltd | Administrative & support | 2013 |
| Central Property Service Limited | Real estate | 2020 |
| Centre Court Investments Ltd | Real estate | 2016 |
| Centre for Transitional Peace for Afghanistan | Other services | 2025 |
| Centre of Excellence Across UK Limited | Professional & scientific | 2023 |