| CDR Garage Limited | Wholesale & retail | 2025 |
| CDT Consultancy Limited | Professional & scientific | 2022 |
| CDZ Limited | Real estate | 2024 |
| CE Compliance Solutions Limited | Professional & scientific | 2009 |
| CE People Limited | Administrative & support | 2024 |
| CEB Travels Ltd | Administrative & support | 2026 |
| CEC Northampton Ltd | Real estate | 2023 |
| Cecile Collective Ltd | Extraterritorial | 2020 |
| CED Contractors (Essex) Limited | Construction | 2006 |
| Cedar Care Support Ltd | Health & social care | 2025 |
| Cedar Gate (Northampton) Management Company Limited | Real estate | 2011 |
| Cedar House Northampton Limited | Real estate | 2011 |
| Cedar Music & Entertainment Limited | Information & communication | 2024 |
| Cedar PP Ltd | Health & social care | 2019 |
| Cedar Rental Homes Limited | Households | 2024 |
| Cedar Valley Limited | Hospitality | 2014 |
| Cedarsouth Limited | Administrative & support | 1985 |
| Cediam Healthcare Ltd | Health & social care | 2024 |
| Cedits Ltd. | Water & waste | 2011 |
| Cedrus Property Group Limited | Real estate | 2020 |
| CEE KAY Construction Ltd | Administrative & support | 2024 |
| Ceekay Properties Limited | Real estate | 2018 |
| Cegmeg Limited | Financial services | 2018 |
| Ceilingworks Ltd | Construction | 2015 |
| CEJ Trading Ltd | Wholesale & retail | 2026 |
| Celadore Bridal Ltd | Wholesale & retail | 2020 |
| Celebi Ltd | Hospitality | 2018 |
| Celection Limited | Professional & scientific | 2023 |
| Celes Blue LLP | | 2023 |
| Celestial Properties Limited | Real estate | 2026 |
| Celetec Ltd | Wholesale & retail | 2023 |
| Celistar Limited | Wholesale & retail | 2025 |
| Celius Ltd | Administrative & support | 2007 |
| Cellinx Ltd | Other services | 2018 |
| Cellspex Ltd | Manufacturing | 2024 |
| CELPROPCO1 Limited | Real estate | 2024 |
| Cemschiiconstruct Ltd | Construction | 2022 |
| Cenaj Transport Ltd | Transport & logistics | 2024 |
| Centaxo Ltd | Professional & scientific | 2020 |
| Center for Strategic Youth and Global Affairs Ltd | Professional & scientific | 2025 |
| Centiant Intl Limited | Information & communication | 2013 |
| Centiant Limited | Manufacturing | 2012 |
| Centra AI Limited | Information & communication | 2025 |
| Central African Tours Ltd | Administrative & support | 2022 |
| Central Car Transport Limited | Wholesale & retail | 2025 |
| Central Civils Limited | Administrative & support | 2016 |
| Central Finishing Limited | Construction | 2015 |
| Central Food and Wine Northampton Ltd | Wholesale & retail | 2018 |
| Central Food Northampton Ltd | Wholesale & retail | 2025 |
| Central Foods Limited | Wholesale & retail | 1991 |
| Central London Car & Taxi Hire Limited | Transport & logistics | 2009 |
| Central London Cleaning Ltd | Administrative & support | 2016 |
| Central Office Solutions Limited | Wholesale & retail | 2014 |
| Central Tax Office Ltd | Professional & scientific | 2023 |
| Centravista Limited | Professional & scientific | 2025 |
| Centre for Citizenship Enterprise and Governance Limited | Education | 2015 |
| Centre for Developmental and Complex Trauma Ltd | Professional & scientific | 2026 |
| Centre for Population Health Ltd | Professional & scientific | 2022 |
| Centre Oak River Education & Social Care Ltd | Education | 2025 |
| Centre of Hispanic Studies Ltd. | Education | 2020 |
| Centre Point Distribution Limited | Real estate | 1999 |
| Centreline Mechanical Services Limited | Professional & scientific | 2012 |
| Centrim Life Ltd | Information & communication | 2025 |
| Centum(Uk) Ltd | Administrative & support | 2023 |
| Centurion Legacy Limited | Professional & scientific | 2017 |
| Century Business Finance Limited | Financial services | 2014 |
| Century Cladding Ltd | Construction | 2018 |
| Century Finance Group Limited | Financial services | 2025 |
| Cepa Brand Solutions Limited | Professional & scientific | 2020 |
| Cepo Construction Ltd | Construction | 2021 |
| Cera Eyecare Ltd | Health & social care | 2020 |
| Ceramasphere Ltd | Professional & scientific | 2011 |
| Cerri Hand Car Wash Ltd | Other services | 2026 |
| Cert Fire Ltd | Public administration | 2025 |
| Certification Platform Ltd | Administrative & support | 2025 |
| Certify Care Ltd | Information & communication | 2024 |
| Certus Life Solutions Limited | Administrative & support | 2013 |
| Certus Recruitment Group Limited | Administrative & support | 2017 |
| Cervine Limited | Administrative & support | 2015 |
| CES Logistics Limited | Transport & logistics | 2013 |
| Ceta Ticaret Ltd | Wholesale & retail | 2025 |
| Ceyrah Ltd | Wholesale & retail | 2026 |
| CEZ Trans Ltd | Transport & logistics | 2024 |
| CF 2024 Ltd | Health & social care | 2024 |
| CF Incorporated Ltd | Education | 2023 |
| CF Maneng Solutions Limited | Professional & scientific | 2024 |
| CFL Civils Limited | Construction | 2019 |
| Cfle Developments UK Ltd | Construction | 2024 |
| CFR Management Services Limited | Wholesale & retail | 2003 |
| Cfsc.Esphysio Ltd | Health & social care | 2023 |
| CG Contractors (London) Limited | Construction | 2014 |
| CG Electrical Contractors Ltd | Construction | 2010 |
| CG Electrical Solutions Limited | Construction | 2022 |
| CGH Developments Limited | Real estate | 1999 |
| CGL Consultancy Limited | Manufacturing | 2015 |
| CGM Building Contractor Ltd | Construction | 2017 |
| Cgrowth Capital Bond Ltd | Financial services | 2015 |
| CGT Realisations Ltd | Administrative & support | 2006 |
| Cgtm Ltd | Professional & scientific | 2025 |
| CH Brickwork Limited | Construction | 2021 |