| Canary Accounting Limited | Professional & scientific | 2019 |
| Canary Creative Limited | Professional & scientific | 2024 |
| Cannell-Mcdonald Logistics Limited | Transport & logistics | 2025 |
| Cannon Driver Hire Ltd | Transport & logistics | 2022 |
| Canntox International Limited | Extraterritorial | 2019 |
| Cantate Communications Limited | Financial services | 2011 |
| Cantate Print Limited | Information & communication | 1934 |
| Capequine Ltd | Wholesale & retail | 2025 |
| Capricorn THM Ltd | Transport & logistics | 2018 |
| CAR13S Transport Limited | Transport & logistics | 2021 |
| CAR4U 16 Ltd | Wholesale & retail | 2016 |
| CAR4U 17 Ltd | Wholesale & retail | 2024 |
| Caraires Property Ltd | Households | 2019 |
| Carbon NET Neutral Technology Solutions Limited | Information & communication | 2022 |
| Cardwell Estates and Developments Ltd | Real estate | 2026 |
| Care Free Couriers Limited | Transport & logistics | 1994 |
| Care SAI Limited | Health & social care | 2015 |
| Care Staffing Ltd | Health & social care | 2019 |
| Care-Infinity Limited | Health & social care | 2023 |
| Career Capitaall Limited | Administrative & support | 2019 |
| Career Search Limited | Extraterritorial | 2011 |
| Careiq Solutions Ltd | Information & communication | 2025 |
| Caretip Limited | Extraterritorial | 1999 |
| Cargo Blue IP Ltd | Administrative & support | 2007 |
| Cariad Theatre Productions Ltd | Arts & recreation | 2025 |
| Caridian Limited | Financial services | 2021 |
| Carinformation Ltd | Information & communication | 2023 |
| Cariolla Trans Ltd | Transport & logistics | 2024 |
| Carju Limited | Professional & scientific | 2016 |
| Carlton Solar Farm Limited | Energy | 2020 |
| Carmus Transport Ltd | Transport & logistics | 2020 |
| Carnegie Sporting Club Ltd. | Administrative & support | 2023 |
| Carnegie Sporting Ltd | Arts & recreation | 2023 |
| Caroline House Limited | Real estate | 2003 |
| Carp Care UK Ltd | Wholesale & retail | 2024 |
| Carst & Walker (UK) Ltd. | Wholesale & retail | 1993 |
| Carte Blanche Travel Limited | Hospitality | 2009 |
| Carter & King Lettings Ltd | Real estate | 2014 |
| Carter and King Ltd | Real estate | 2014 |
| Carter Brooke Property Ltd | Real estate | 2021 |
| Carter-Thynne Productions Ltd | Arts & recreation | 2022 |
| Carvoa Ltd | Manufacturing | 2025 |
| Cascais Transport Ltd | Transport & logistics | 2019 |
| Cash Purchase and Investment Limited | Real estate | 1938 |
| Cashmore & Co. LLP | | 2007 |
| Cashmore & Co. Rugby Limited | Professional & scientific | 1994 |
| Cassilex Cafe Limited | Hospitality | 2010 |
| Castle Mound Estates Limited | Real estate | 2015 |
| Catalyst Services International Limited | Manufacturing | 2023 |
| Catesby Construction Limited | Professional & scientific | 1976 |
| Catesby Estates Land Limited | Professional & scientific | 1956 |
| Catesby Homes Limited | Real estate | 1999 |
| Catlin Trans Limited | Transport & logistics | 2018 |
| Catthorpe Loft Ltd | Wholesale & retail | 2020 |
| Catti Properties Ltd | Real estate | 2024 |
| Cattrell Consultancy Limited | Professional & scientific | 2015 |
| Cave Cultura Ltd | Administrative & support | 2023 |
| Cawston Electrical Ltd. | Construction | 2017 |
| Cawston Engineering Services Ltd | Professional & scientific | 2025 |
| Cawston Field I P Ltd. | Professional & scientific | 2004 |
| Cawston Grange Management Company Limited | Professional & scientific | 2004 |
| Cawston Grange Primary School | Education | 2013 |
| Cawston Motor Company Limited | Wholesale & retail | 2025 |
| Cawston Motor Group Ltd | Wholesale & retail | 2024 |
| Cawston QC Ltd | Health & social care | 2025 |
| Cawston Solutions Electrical Limited | Construction | 2014 |
| Cawston Solutions Limited | Construction | 2020 |
| Cawstone Ltd | Information & communication | 2015 |
| Cawstons Services Limited | Information & communication | 2016 |
| Cazacu Transport Ltd | Transport & logistics | 2025 |
| CB Development Solutions Ltd | Financial services | 2025 |
| CB Rugby Ltd | Other services | 2020 |
| CBD Corner Limited | Wholesale & retail | 2024 |
| Cbogdan Transport Ltd | Transport & logistics | 2024 |
| CBS Driver Hire and Recruitment Limited | Administrative & support | 2016 |
| Cbth Developments Ltd | Construction | 2024 |
| CC (Mtech) Limited | Professional & scientific | 2013 |
| CC Sales Sipport Limited | Professional & scientific | 2011 |
| CCB Events & Production Ltd | Administrative & support | 2022 |
| Cceo Kenny Limited | Wholesale & retail | 2022 |
| CD Design Consulting Ltd | Professional & scientific | 2024 |
| CD Sports Therapy Limited | Health & social care | 2023 |
| CD Trans-Trade Ltd | Transport & logistics | 2025 |
| CD74 Transport Limited | Transport & logistics | 2017 |
| CDM Resources Ltd | Professional & scientific | 2007 |
| Ceaw Ltd | Professional & scientific | 2025 |
| Cebenn Limited | Real estate | 2021 |
| Cedar Associates Management Development Limited | Professional & scientific | 2003 |
| Cedar Grove Clinic Ltd | Administrative & support | 2019 |
| Ceja Limited | Administrative & support | 2013 |
| Ceka Transport Ltd | Transport & logistics | 2025 |
| CEM Spedition Ltd | Transport & logistics | 2021 |
| Cemml Ltd | Information & communication | 2020 |
| CEN Consult Trustees Limited | Other services | 2025 |
| CEN QS Consulting Limited | Professional & scientific | 2013 |
| Censeo Consulting Limited | Professional & scientific | 2005 |
| Central Drains Ltd | Construction | 2021 |
| Central England Air Ambulance Limited | Health & social care | 2025 |
| Central England Neurosurgery Limited | Health & social care | 2010 |
| Centralyze Accounting Ltd | Professional & scientific | 2024 |