| Captiva Solutions Limited | Professional & scientific | 2009 |
| Car Shades Holdings Limited | Manufacturing | 2015 |
| Car Shades Limited | Extraterritorial | 2015 |
| Carbanana Ltd | Education | 2021 |
| Carbanana Online Ltd | Education | 2022 |
| Cardboard Merchants Ltd | Wholesale & retail | 2023 |
| Cards & More Ltd | Wholesale & retail | 2012 |
| Cardtricks UK Ltd | Wholesale & retail | 2023 |
| Care After Combat | Other services | 2014 |
| Care After Combat Trading Limited | Other services | 2014 |
| Care Matters Mobility Newark Limited | Wholesale & retail | 2005 |
| Care Pilot Ltd | Administrative & support | 2018 |
| Care Vault Ltd | Health & social care | 2022 |
| Care Wish Ltd | Health & social care | 2010 |
| Cargosync Limited | Transport & logistics | 2026 |
| Carhartt UK Limited | Wholesale & retail | 2020 |
| Carlile Site Services Limited | Construction | 2024 |
| Carlin Flooring Limited | Construction | 2014 |
| Carlos’ Car Care Limited | Wholesale & retail | 2022 |
| Carlton Wood Renewables Limited | Energy | 2012 |
| Carmen Films Ltd | Information & communication | 2025 |
| Carmen Rock Investments Limited | Real estate | 2023 |
| Carnarvon Professional and Advisory Services Limited | Professional & scientific | 2020 |
| Carpet Fresh Nottingham Limited | Administrative & support | 2025 |
| Carr Inspired Properties Limited | Real estate | 2015 |
| Carr Steel Fabrications Limited | Wholesale & retail | 1979 |
| Carriage Way 1968 Limited | Extraterritorial | 2014 |
| Carringstone Homes Ltd | Real estate | 2022 |
| Carrington Hall Management Limited | Households | 2004 |
| Carrington Living Limited | Real estate | 2019 |
| Carson Lease Ltd | Administrative & support | 2025 |
| Carta Risk Limited | Financial services | 2025 |
| Carter Thomas Design & Installation Ltd | Construction | 2019 |
| Cartergate BED Centre Holdings Limited | Financial services | 2015 |
| Carters Engineering Contracts Limited | Professional & scientific | 2016 |
| Carved in Granite Ltd | Wholesale & retail | 2016 |
| Casa Property & Design Limited | Real estate | 2020 |
| Cask and Crop Ltd | Hospitality | 2026 |
| Castillo TM Ltd | Construction | 2024 |
| Castle Cuisine Ltd | Hospitality | 2011 |
| Cater-Therm Limited | Wholesale & retail | 2016 |
| Catherine Carter Hair & Beauty (Newark) Limited | Other services | 2010 |
| Catherine Carter Limited | Other services | 2004 |
| Catherine FAY Edwards Ltd Ltd | Extraterritorial | 2024 |
| Caval Business Solutions Limited | Professional & scientific | 2024 |
| Caveney Associates Limited | Administrative & support | 2003 |
| CBF Electrical Contractors Limited | Construction | 2026 |
| CC Restaurant & Catering Ltd | Hospitality | 2012 |
| CD Contracts Limited | Construction | 2018 |
| CDM (Consultancy) Ltd | Professional & scientific | 2003 |
| Cedar Property Management Limited | Real estate | 1997 |
| CEG Solutions Ltd | Construction | 2015 |
| Cell Aerospace Limited | Professional & scientific | 2015 |
| Cella Fine Violins Limited | Manufacturing | 2022 |
| Celmar Ltd | Extraterritorial | 2019 |
| Celtic Blooms Ltd | Wholesale & retail | 2023 |
| Center Parcs (Group Holdings) Ltd | Financial services | 2018 |
| Center Parcs (Holdings 1) Limited | Financial services | 2011 |
| Center Parcs (Holdings 2) Limited | Financial services | 2011 |
| Center Parcs (Holdings 3) Limited | Financial services | 2011 |
| Center Parcs Finance Borrower Limited | Financial services | 2018 |
| Center Parcs Finance Holdings 2 Limited | Financial services | 2018 |
| Central Estates Management Limited | Real estate | 2017 |
| Central Producers (Marketing) Limited | Wholesale & retail | 1983 |
| Centricorp Homes Limited | Real estate | 2026 |
| Centricorp Resources Limited | Administrative & support | 2017 |
| Centrum Pile Limited | Manufacturing | 2001 |
| Ceriph Limited | Professional & scientific | 2020 |
| Certain Dark Things Productions Ltd | Administrative & support | 2016 |
| Cerys Equestrian Limited | Wholesale & retail | 2023 |
| Ceylon OIL Ltd | Wholesale & retail | 2013 |
| CG MAX Properties Ltd | Real estate | 2026 |
| CGS Estates Ltd | Real estate | 2024 |
| CH Coaching & Consultancy Ltd | Professional & scientific | 2024 |
| Challands Farm Events Limited | Hospitality | 2021 |
| Challender Limited | Professional & scientific | 2014 |
| Cham 25 Ltd | Real estate | 2025 |
| Chamber Advisory Ltd | Professional & scientific | 2025 |
| Champion Media Ltd | Professional & scientific | 2023 |
| Chandra Investments Limited | Real estate | 2019 |
| Channa Limited | Financial services | 2025 |
| Channel Creative Ltd | Professional & scientific | 2018 |
| Channel D Services Limited | Real estate | 2008 |
| Channel Pumps Limited | Manufacturing | 2001 |
| Chapel Farm Close Management Company Limited | Households | 2017 |
| Chappells Barbers Ltd | Administrative & support | 2016 |
| Charles Brightmore (Transport) Limited | Transport & logistics | 2018 |
| Charles Lawrence Surfaces Limited | Manufacturing | 1968 |
| Charles Samuel Ltd | Construction | 2018 |
| Charlie Adan Executive Limited | Professional & scientific | 2018 |
| Charlie Adan Limited | Real estate | 2006 |
| Charnwood Hearing AID Centre Limited | Wholesale & retail | 2010 |
| Charnwood Homes Farndon Ltd | Real estate | 2021 |
| Charnwood Joinery & Building Limited | Construction | 2019 |
| Charnwood Short Stays Ltd | Hospitality | 2022 |
| Charterhouse Management Solutions Ltd | Professional & scientific | 1989 |
| CHATBOT4AGENTS Ltd | Information & communication | 2025 |
| Chatsworth Wills and Estate Planning Limited | Other services | 2008 |
| Chatterbox Consulting Ltd | Professional & scientific | 2018 |
| Chatterley Heights Management Company Limited | Households | 2012 |