| Canopy Property Group Ltd | Extraterritorial | 2024 |
| Capa Developments Ltd | Construction | 2019 |
| Cape Estates Limited | Real estate | 1965 |
| Capfun UK Limited | Hospitality | 2022 |
| Capital City Development UK BR Ltd | Construction | 2025 |
| Capital Games Ltd | Wholesale & retail | 2022 |
| Capital Properties Lettings Ltd | Real estate | 2021 |
| Capital Radio UAE Limited | Information & communication | 2018 |
| Caple Banks Limited | Financial services | 2010 |
| Captialeight Ltd | Hospitality | 2023 |
| Captivated EYE Limited | Arts & recreation | 2025 |
| Capture DEV Ltd | Information & communication | 2024 |
| Capturvate Ltd. | Information & communication | 2017 |
| Car Finder Gloucester Ltd | Wholesale & retail | 2015 |
| Car Larka Ltd | Wholesale & retail | 2025 |
| Car Motion Gloucester Ltd | Wholesale & retail | 2018 |
| Car Trade Direct Limited | Wholesale & retail | 2000 |
| Caradoc Properties Limited | Real estate | 2017 |
| Carbon Focus Ltd | Professional & scientific | 2016 |
| Carcou Ltd | Other services | 2024 |
| Cardalo Property Limited | Construction | 2021 |
| Care and Repair (Gloucester) Limited | Administrative & support | 2011 |
| Care Construction Limited | Construction | 2016 |
| Care Horizons Limited | Health & social care | 2004 |
| Care View Limited | Health & social care | 2023 |
| Caredent Associates Ltd | Health & social care | 2025 |
| Carelektronics Ltd | Wholesale & retail | 2023 |
| Caremate Group Ltd | Health & social care | 2022 |
| Careplan Staffing Ltd | Health & social care | 2025 |
| Carhelpers.Co.Uk Ltd | Extraterritorial | 2016 |
| Caring JO Ltd | Health & social care | 2025 |
| Carlton Atlantic Travel & Events Holdings Ltd | Financial services | 2025 |
| Carlton Atlantic Travel & Events Limited | Administrative & support | 1999 |
| Carlton Connections LLP | | 2013 |
| Carlton Motors Workshops Ltd | Wholesale & retail | 2017 |
| Carlys Cookies Limited | Manufacturing | 2024 |
| Carmin Ltd | Hospitality | 2026 |
| Carroll Electrical Contractors Ltd | Construction | 2022 |
| Carryaround Holdings Limited | Financial services | 2020 |
| Carryaround Limited | Financial services | 2020 |
| Carter Nash Limited | Professional & scientific | 2007 |
| Carterdale (Paint Services) Ltd | Manufacturing | 2020 |
| Carterdale Ltd. | Manufacturing | 2010 |
| Carters Electrical Installations (Glos) Ltd | Construction | 2021 |
| Carvis Construction Limited | Construction | 2012 |
| Casathel Properties Ltd | Real estate | 2024 |
| Cashtrac Ltd | Professional & scientific | 2006 |
| Caspa Training Limited | Education | 2023 |
| Caspian Projects Limited | Construction | 2003 |
| Cass-Son Ltd | Real estate | 2017 |
| Cass-Stephens Group Limited | Professional & scientific | 2013 |
| Cass-Stephens Insurances Limited | Financial services | 1967 |
| Cass-Stephens Life & Pensions Limited | Financial services | 2019 |
| Cassim Company Ltd | Real estate | 2020 |
| Cast Consultancy UK Limited | Professional & scientific | 2007 |
| Castanum Ventures Limited | Construction | 2007 |
| Castle Construction (Cheltenham) Limited | Construction | 2008 |
| Castle Developments and Leisure Ltd | Hospitality | 2026 |
| Castle Properties (Cheltenham) Limited | Real estate | 2003 |
| Castlepoint Properties Limited | Real estate | 2018 |
| Castlereagh Associates Limited | Professional & scientific | 2008 |
| Castula Energy Supply Ltd | Energy | 2020 |
| Catalyst Business & Careers Limited | Administrative & support | 2025 |
| Catch a Smile CIC | Agriculture & fishing | 2019 |
| Caterbird Limited | Education | 2016 |
| Catercater Limited | Hospitality | 2007 |
| Cateron Ltd | Extraterritorial | 2025 |
| Cathedral City Lets Ltd | Hospitality | 2022 |
| Cathedral Florists Limited | Wholesale & retail | 1967 |
| Cathedral VUE Ltd | Wholesale & retail | 2019 |
| Cathy Birch Limited | Other services | 2022 |
| Catkins Property Limited | Real estate | 2022 |
| Catstevens Investments Ltd | Real estate | 2025 |
| Cauldron Creations Ltd | Wholesale & retail | 2026 |
| Caversham Marketing Ltd | Professional & scientific | 2018 |
| CBF Fulfilment Ltd | Transport & logistics | 2017 |
| CBI Digital Limited | Information & communication | 2024 |
| CBM Partners Ltd | Professional & scientific | 2018 |
| CBM Psych Consulting Ltd | Health & social care | 2025 |
| CBS Coates Building Services Ltd | Construction | 2020 |
| Cbsb Limited | Professional & scientific | 2015 |
| CC Courtney Consulting Limited | Professional & scientific | 2022 |
| CCD Property Developements Ltd | Construction | 2023 |
| CCF GB & NI Limited | Other services | 2021 |
| Ccle Investments Ltd | Financial services | 2020 |
| CCR Equestrian Ltd | Agriculture & fishing | 2019 |
| CCR Property Developments Limited | Construction | 2019 |
| Ccss Property Ltd | Real estate | 2026 |
| CD Foodhouse Ltd | Hospitality | 2025 |
| Cdpi Consulting Ltd | Professional & scientific | 2017 |
| CDS Taxis and Private Hire Limited | Transport & logistics | 2016 |
| Cecurit Limited | Professional & scientific | 2024 |
| Cedar Motor (Holdings) Limited | Wholesale & retail | 2019 |
| Cedar Motor House Ltd | Wholesale & retail | 2008 |
| Cedar Vehicle Sales Ltd | Wholesale & retail | 2014 |
| Cedars Salons Ltd | Other services | 2014 |
| Cedars Training Academy Limited | Education | 2002 |
| CEH Contracting Ltd | Extraterritorial | 2022 |
| CEH Contracts Ltd | Construction | 2018 |
| Ceiling Speakers Ltd | Extraterritorial | 2019 |