| Carrel (UK) Limited | Manufacturing | 1998 |
| Carrick Real Estate Limited | Real estate | 2017 |
| Carrick Signs Limited | Administrative & support | 2007 |
| Carrie Rose Ltd | Real estate | 2023 |
| Carrier E-Commerce UK Ltd | Wholesale & retail | 2026 |
| Carrier Ltd | Administrative & support | 1991 |
| Carrig Concrete Slipforms Limited | Manufacturing | 2025 |
| Carrill Grove Holdings Ltd | Households | 2021 |
| Carrill Grove Investments Ltd | Real estate | 2024 |
| Carrington Caravan Care Ltd | Extraterritorial | 2012 |
| Carrington Chase Law Ltd | Professional & scientific | 2023 |
| Carrington Clinic Ltd | Health & social care | 2025 |
| Carrington Group Mains Lane Ltd | Construction | 2016 |
| Carrington Power Limited | Energy | 2003 |
| Carrington Riding Centre Limited | Arts & recreation | 1999 |
| Carringtons (Shippers) Limited | Real estate | 1995 |
| Carringtons Advisory Ltd | Administrative & support | 2016 |
| Carrol MAY Glenford Coleman Limited | Extraterritorial | 2024 |
| Carroll Construction & Highways Limited | Construction | 2018 |
| Carroll Planning Services Ltd | Construction | 2022 |
| Carroll Property Investments Ltd | Real estate | 2026 |
| Carrot Catering Ltd | Hospitality | 2024 |
| Carrott Ltd | Information & communication | 2026 |
| Carrs Foods Holdings Limited | Wholesale & retail | 2004 |
| Carrwood Estates Limited | Professional & scientific | 1992 |
| Carry on Transport Ltd | Transport & logistics | 2024 |
| Carry World Ltd | Wholesale & retail | 2026 |
| Carryport Ltd | Wholesale & retail | 2023 |
| Cars 4 People Ltd | Extraterritorial | 2014 |
| Cars 4 U Traders Ltd | Wholesale & retail | 2019 |
| Cars Boss Ltd | Wholesale & retail | 2023 |
| Cars Emporium Limited | Wholesale & retail | 2021 |
| Cars Heaven Ltd | Wholesale & retail | 2023 |
| Cars of Didsbury Limited | Wholesale & retail | 2004 |
| Cars of Manchester Limited | Wholesale & retail | 2019 |
| Cars Station Limited | Wholesale & retail | 2025 |
| Cars TEC Limited | Wholesale & retail | 2025 |
| CARS99 Limited | Transport & logistics | 2018 |
| Carsdun Ltd | Professional & scientific | 2012 |
| Cart Afrik Ltd | Wholesale & retail | 2025 |
| Cart DNA Ltd | Wholesale & retail | 2025 |
| Cart Twist Ltd | Wholesale & retail | 2025 |
| Cart Whizz Ltd | Information & communication | 2025 |
| Cartay Ceilings Ltd | Construction | 2015 |
| Cartcrafted Ltd | Wholesale & retail | 2024 |
| Carter & Co Property Developments Ltd | Construction | 2025 |
| Carter and Lennon Properties Limited | Real estate | 2021 |
| Carter Brothers Transport Limited | Information & communication | 2003 |
| Carter Creative Hair Studio Limited | Other services | 2022 |
| Carter Harding Rail Services Ltd | Construction | 2018 |
| Carter Heath Ltd | Real estate | 2013 |
| Carter Investment Properties Ltd | Real estate | 2025 |
| Carter Lodges Limited | Hospitality | 2025 |
| Carter Loftus Limited | Health & social care | 2021 |
| Carter Lomax Limited | Professional & scientific | 2023 |
| Carter Resources Ltd | Construction | 2017 |
| Carter Rose (UK) Limited | Professional & scientific | 2014 |
| Carter's 7 X Ltd | Wholesale & retail | 2011 |
| Cartersarmsrhodes Ltd | Hospitality | 2026 |
| Carthage for Trading Ltd | Wholesale & retail | 2025 |
| Cartify Digital Ltd | Wholesale & retail | 2026 |
| Cartlogic Ltd | Wholesale & retail | 2025 |
| Cartoon (Holdings) Limited | Wholesale & retail | 2006 |
| Cartoro Ltd | Professional & scientific | 2023 |
| Cartridge Care Ltd | Manufacturing | 2013 |
| Cartridge Giant Ltd | Extraterritorial | 2006 |
| Cartridge Monkey Limited | Extraterritorial | 2005 |
| Cartridgemonkey.Com Limited | Extraterritorial | 2005 |
| CARTRIDGES4U Ltd | Wholesale & retail | 2025 |
| Cartwright Construction Services Limited | Construction | 2019 |
| Cartwright Electrical Engineering Ltd | Administrative & support | 2012 |
| Cartwright Employment Services Limited | Administrative & support | 2017 |
| Cartwright Holdings Ltd | Financial services | 2026 |
| Cartwright-Terry Limited | Health & social care | 2019 |
| Cartwrights Chemists Limited | Wholesale & retail | 1953 |
| Carty Enterprises Limited | Wholesale & retail | 2023 |
| Carus Consultancy Limited | Professional & scientific | 2025 |
| Carve LAB Ltd | Hospitality | 2019 |
| Carviano Properties Limited | Real estate | 2022 |
| Carwood Manor Limited | Hospitality | 2024 |
| Carxoo Limited | Wholesale & retail | 2023 |
| Carzap Ltd | Administrative & support | 2025 |
| Carzy Ltd | Wholesale & retail | 2025 |
| CAS Management Services Limited | Professional & scientific | 2022 |
| CAS Project Consulting Ltd | Professional & scientific | 2025 |
| Casa Amici Ltd | Hospitality | 2026 |
| Casa Blanc Limited | Wholesale & retail | 2024 |
| Casa Canvas Limited | Construction | 2023 |
| Casa Cwtch Ltd | Real estate | 2025 |
| Casa DE Estrellas Limited | Hospitality | 2024 |
| Casa DI Cucina Limited | Wholesale & retail | 2012 |
| Casa DI Marmo Ltd | Construction | 2025 |
| Casa DNC Ltd | Real estate | 2023 |
| Casa Express Ltd | Households | 2025 |
| Casa Fresco Limited | Hospitality | 2025 |
| Casa Hacienda Property Solutions Limited | Real estate | 2025 |
| Casa Home Kitchen Ltd | Hospitality | 2025 |
| Casa Investment Group Limited | Real estate | 2024 |
| Casa Mexica (Manchester) Limited | Hospitality | 2019 |
| Casa Palma Ltd | Wholesale & retail | 2025 |