| Care Wings Limited | Health & social care | 2018 |
| Care-A-Lot Limited | Health & social care | 2021 |
| Care-Tec Digital Media & Marketing Ltd | Information & communication | 2024 |
| Careina Wellenss Ltd | Health & social care | 2026 |
| Carelead Limited | Administrative & support | 2023 |
| Caremart Recruitment Solutions Limited | Administrative & support | 2023 |
| Carewise Healthcare Limited | Health & social care | 2019 |
| Carfora Ltd | Wholesale & retail | 2024 |
| Cargo 4 Ltd | Wholesale & retail | 2022 |
| Cargo Express Holdings Limited | Financial services | 2017 |
| Cargo Express Limited | Administrative & support | 2009 |
| Cargoprogen Ltd | Transport & logistics | 2025 |
| Carhoc UK Limited | Wholesale & retail | 2024 |
| Caribbean Delight in Tortuga Ltd | Hospitality | 2022 |
| Caring Alliance Ltd | Health & social care | 2025 |
| Caring Pals Limited | Health & social care | 2021 |
| Carlton FM Ltd | Professional & scientific | 2024 |
| Carltons Facilities Limited | Construction | 2025 |
| Carn Brea Apartments Management Company Limited | Households | 2017 |
| Carnell Utilities Ltd | Construction | 2024 |
| Carnest Limited | Wholesale & retail | 2025 |
| Carnwell Logistics Ltd | Other services | 2022 |
| Carnwell Property Ltd | Real estate | 2026 |
| Caro Plates Ltd | Wholesale & retail | 2018 |
| Carol Burt Ltd | Health & social care | 2012 |
| Caroline Pets Limited | Wholesale & retail | 2012 |
| Caroline Salt Recruitment Ltd | Administrative & support | 2025 |
| Caroline Street Limited | Real estate | 2022 |
| Carousel FUN Limited | Arts & recreation | 2012 |
| Carr's Carpets and Flooring Ltd | Administrative & support | 2019 |
| Carrcroft Homes Ltd | Real estate | 2021 |
| Carrington Scaffolding Holdings Limited | Financial services | 2022 |
| Carrot Services 2023 Ltd | Health & social care | 2023 |
| Cars by Nikolas Ltd | Wholesale & retail | 2025 |
| Cars Refrigeration Limited | Wholesale & retail | 1995 |
| Carsington Aqua Agencies Limited | Wholesale & retail | 2019 |
| Carson Powell Construction Ltd | Construction | 2005 |
| Carson Powell Holdings Limited | Financial services | 2019 |
| Carter Benson Wagner Laptops Ltd | Wholesale & retail | 2023 |
| Carter Swift Limited | Construction | 2021 |
| Cartermortgageandprotection Ltd | Financial services | 2024 |
| Cartley Construction Ltd | Construction | 2024 |
| Cartridge Shop (UK) Ltd | Wholesale & retail | 2016 |
| Cartwpubs Ltd | Hospitality | 2023 |
| Carzu Limited | Administrative & support | 2017 |
| Casa Jardim Limited | Hospitality | 2021 |
| Casa Mortgage and Protection Ltd | Financial services | 2023 |
| Casa Serendipity Limited | Real estate | 2001 |
| Casalinga Design Ltd | Real estate | 2023 |
| Casasola Apparel Limited | Wholesale & retail | 2024 |
| Casasola Limited | Other services | 2011 |
| Caseking UK Limited | Wholesale & retail | 2012 |
| Cashville Limited | Transport & logistics | 2023 |
| Cass Construction Ltd | Construction | 2020 |
| Cassa Logistics Limited | Transport & logistics | 2019 |
| Castle (Stafford) Limited | Professional & scientific | 2008 |
| Castle Aggregates Limited | Wholesale & retail | 1987 |
| Castle Bricklayers Ltd | Construction | 2021 |
| Castle Camping Ltd | Hospitality | 2013 |
| Castle Claysales Limited | Wholesale & retail | 1980 |
| Castle Comfort Homes Ltd. | Real estate | 2009 |
| Castle Pepper Ltd. | Hospitality | 2020 |
| Castle Tool Hire Limited | Administrative & support | 1996 |
| Castle View Property Ltd | Real estate | 2026 |
| Castletown Garage Limited | Wholesale & retail | 2016 |
| Castletown Property Lettings Limited | Real estate | 2025 |
| Castron Properties Limited | Real estate | 2018 |
| Casual Catering Company Limited | Hospitality | 2025 |
| Cat Enclosures Ltd | Construction | 2024 |
| Cata Nanny Ltd | Health & social care | 2025 |
| Catalyst Insight Ltd | Professional & scientific | 2024 |
| Catchems Corner Hair Design Ltd | Other services | 2023 |
| Catching Light Limited | Manufacturing | 2016 |
| Catchthewave Ltd | Wholesale & retail | 2025 |
| Caterham Fireplaces Limited | Extraterritorial | 2004 |
| Caterham Marble and Granite Limited | Manufacturing | 1995 |
| Cathay Industries (International) Limited | Administrative & support | 2001 |
| Catkitsch Boutique Ltd | Wholesale & retail | 2025 |
| Cats & Carbs (UK) Limited | Wholesale & retail | 2007 |
| Catslab Ltd | Arts & recreation | 2025 |
| Cattov Ltd | Transport & logistics | 2019 |
| Cauldon Locks (Staffs) Ltd | Real estate | 2026 |
| Cauldon Locks Limited | Real estate | 2015 |
| Cavca S. Ltd | Construction | 2016 |
| Caveman Training Limited | Arts & recreation | 2013 |
| Caverswall Minerals Limited | Wholesale & retail | 2013 |
| Caverswall Park Management Company Limited | Households | 2017 |
| Cavonix Ltd | Information & communication | 2019 |
| Caxton Builders (Midlands) Limited | Construction | 2009 |
| Caxton Facades Limited | Construction | 2014 |
| Caxton Joinery Limited | Construction | 2014 |
| Caxton Midlands Group Limited | Financial services | 2014 |
| Caxton Property Developments Limited | Construction | 2012 |
| Cayenne Commercials Limited | Real estate | 2023 |
| CB Light Haulage Limited | Transport & logistics | 2017 |
| CB Protect Limited | Financial services | 2019 |
| CBB Engineering Services Ltd | Professional & scientific | 2023 |
| CBI Group Limited | Other services | 2020 |
| CBO Logistics Transport Ltd | Transport & logistics | 2024 |
| CBS Topco Limited | Wholesale & retail | 2020 |