| Capstan Canal Estates Limited | Real estate | 2019 |
| Capture Your Beauty Limited | Other services | 2023 |
| Capturingthemoment Limited | Information & communication | 2003 |
| Car Finance 365 Ltd | Financial services | 2024 |
| Car Hunter - USA Ltd | Information & communication | 2021 |
| Car Parts Direct Limited | Wholesale & retail | 2019 |
| Car Transplants (Holdings) Limited | Financial services | 2014 |
| Car Transplants (Hurleston) Limited | Real estate | 2014 |
| Car Transplants Limited | Water & waste | 1986 |
| Car Transplants Recycling Limited | Water & waste | 2014 |
| Car-Negotiator Limited | Wholesale & retail | 2016 |
| Caramea Trans Ltd | Transport & logistics | 2021 |
| Carapanceanu Express Courier Services Ltd | Transport & logistics | 2024 |
| Carbon Char Limited | Extraterritorial | 2025 |
| Carbon X74 Ltd | Construction | 2019 |
| Carbounty Ltd | Wholesale & retail | 2026 |
| Carcroft Commercials Limited | Wholesale & retail | 2025 |
| Carcroft Joinery Limited | Manufacturing | 2001 |
| Carcroft Rose Store Ltd | Wholesale & retail | 2025 |
| Cardae Property Ltd | Real estate | 2022 |
| Cardarnaby Ltd | Real estate | 2021 |
| Care Above ALL UK Limited | Administrative & support | 2022 |
| Care and Training Limited | Administrative & support | 2017 |
| Care Gaffers Ltd | Education | 2025 |
| Care Network Solutions Limited | Health & social care | 2005 |
| Care Tree Holding Ltd | Financial services | 2018 |
| Care Tree Invest 2 Ltd | Financial services | 2021 |
| Care Tree Invest Ltd | Financial services | 2018 |
| Care Tree Maintenance Ltd | Administrative & support | 2025 |
| Care Tree Midco Limited | Financial services | 2021 |
| Care Tree Mino Limited | Financial services | 2020 |
| CARE161 Ltd. | Professional & scientific | 2019 |
| Carecart Online Ltd | Wholesale & retail | 2025 |
| Career Cafe CIC | Other services | 2023 |
| Careport Ltd | Health & social care | 2025 |
| Careworks Consulting Ltd | Professional & scientific | 2026 |
| Carey Rope Access Solutions Ltd | Construction | 2018 |
| Carfrae & Smith Ltd | Hospitality | 2024 |
| Cargo Transport Group Ltd | Transport & logistics | 2016 |
| Cargosure Limited | Transport & logistics | 2026 |
| Carhluxe Limited | Wholesale & retail | 2025 |
| Caring Buddies Home Care Limited | Health & social care | 2025 |
| Caring Hands Doncaster Ltd | Health & social care | 2026 |
| Caring Hands Home Care ( Doncaster) Limited | Health & social care | 2026 |
| Caring Personal Assistants Ltd | Health & social care | 2014 |
| Caris Capital Ltd | Real estate | 2024 |
| Caris Care Limited | Professional & scientific | 2023 |
| Carl Ferrer Limited | Wholesale & retail | 2025 |
| Carl Phillips Transport Ltd | Transport & logistics | 2015 |
| Carl Yates Properties Ltd | Real estate | 2026 |
| Carla&Maya Ltd | Transport & logistics | 2018 |
| Carlisle Construction Ltd | Construction | 2020 |
| Carlton Entertainment Ltd | Arts & recreation | 2023 |
| Carlton Superior Fitness Gym Limited | Arts & recreation | 2022 |
| Carlton Valley Management Company Limited | Households | 2002 |
| Carly's Bar Limited | Hospitality | 2016 |
| Carmen Motors Limited | Wholesale & retail | 2020 |
| Carmside Ltd | Information & communication | 2024 |
| Carnelly Management Consultants Limited | Professional & scientific | 2015 |
| Carol-Anne Ward Limited | Arts & recreation | 2018 |
| Carolight Care Services Ltd | Health & social care | 2022 |
| Carolsway Ltd | Wholesale & retail | 2024 |
| Carolyn Cousins Ltd | Other services | 2016 |
| Carpenters Arms (Tickhill) Limited | Hospitality | 2003 |
| Carpenters Arms (Westwoodside) Limited | Hospitality | 2025 |
| Carpet Vault Ltd | Wholesale & retail | 2015 |
| Carr Gate Developments Ltd | Construction | 2021 |
| Carr Grange Holdings Limited | Financial services | 2003 |
| Carr Grange Joinery Limited | Manufacturing | 2003 |
| Carr Hill Containers Limited | Other services | 2020 |
| Carr Hill Properties Limited | Real estate | 2020 |
| Carr House Allotment Social Enterprise Limited | Agriculture & fishing | 2005 |
| Carr Lodge Phase Two Apartments Management Company Limited | Households | 2021 |
| Carr Lodge Phase Two Management Company Limited | Households | 2021 |
| Carrhill Cafe Ltd | Hospitality | 2019 |
| Carriage Driving Community Community Interest Company | Education | 2020 |
| Carrick Procurement Limited | Professional & scientific | 2010 |
| Carrmichaels Limited | Financial services | 2007 |
| Cars and Commercials Online Ltd | Wholesale & retail | 2025 |
| Cars by Toma Ltd | Wholesale & retail | 2025 |
| Cars Custom Ltd | Wholesale & retail | 2024 |
| Carscomplex Limited | Wholesale & retail | 2025 |
| Carscott Limited | Professional & scientific | 2021 |
| Carta Solutions Ltd | Information & communication | 2025 |
| Carter Mayfair Limited | Real estate | 2002 |
| Carterman Estates Ltd | Households | 2024 |
| Cartiér Holdings Ltd | Real estate | 2026 |
| Cartlidge Investments Ltd | Financial services | 2025 |
| CARTONS4U (Doncaster) Limited | Wholesale & retail | 2013 |
| Cartwright and Co Tiling Contractors Limited | Construction | 2014 |
| Carver Engineering Access & Safety Solutions Limited | Manufacturing | 2013 |
| Carver Engineering Holdings Limited | Financial services | 2013 |
| Carver Engineering Services Limited | Manufacturing | 2005 |
| Carvery and Grill Catering Ltd | Hospitality | 2024 |
| CAS Removals Limited | Transport & logistics | 2005 |
| CAS Transportation Limited | Transport & logistics | 2022 |
| Casa Bella Sorella Boutique Limited | Wholesale & retail | 2020 |
| Casa Bella Sorella Limited | Other services | 2015 |
| Casabridge Properties Group Ltd | Real estate | 2026 |
| Casambro Services Ltd | Wholesale & retail | 2024 |