| Central Transport Provider Ltd | Transport & logistics | 2025 |
| Centre Court Apartments RTM Company Limited | Households | 2013 |
| Centre for Advanced Green Technologies and Innovation (Cagti) CIC | Manufacturing | 2025 |
| Centre for Development Assistance CIC | Administrative & support | 2018 |
| Centre for Digital Public Services Limited | Administrative & support | 2014 |
| Centre for Integrated and Functional Medicine Limited | Professional & scientific | 2016 |
| Centre Nominees Limited | Professional & scientific | 2002 |
| Centre One Limited | Wholesale & retail | 2021 |
| Centreline Design Consulting Limited | Other services | 2013 |
| Centrepoint Logistics UK Ltd | Transport & logistics | 2020 |
| Centrepoint Venue Search Limited | Administrative & support | 2013 |
| Cents Security Services Ltd | Administrative & support | 2020 |
| Centum Recruitment (SAP) Limited | Information & communication | 2017 |
| Centurian Windows Limited | Construction | 2018 |
| Centurion Aerospace Limited | Wholesale & retail | 2020 |
| Centurion VAT Specialists ALL Ltd | Professional & scientific | 2019 |
| Centurion VAT Specialists Ltd | Professional & scientific | 2007 |
| Century Homecare Limited | Construction | 2018 |
| Century Wharf (One) RTM Company Limited | Households | 2012 |
| Century Wharf (Three) RTM Company Limited | Households | 2012 |
| Century Wharf (Two) RTM Company Limited | Households | 2012 |
| Cenworks Ltd | Manufacturing | 2019 |
| CEO by NNT Ltd | Administrative & support | 2025 |
| CEO Investments Limited | Real estate | 2015 |
| Cepheus Analytics Limited | Professional & scientific | 2014 |
| CER Recycling Limited | Water & waste | 2025 |
| Ceralos | Professional & scientific | 2025 |
| Ceramic World Ltd | Wholesale & retail | 2025 |
| Cerberus Equity Ltd | Information & communication | 2024 |
| Cerberus Immersive Ltd | Education | 2024 |
| Cerberus Real Estate Investments PLC | Information & communication | 2024 |
| Cerbu Limited | Construction | 2015 |
| Cereal AD Ltd | Information & communication | 2016 |
| Cereal Cafe BTN Limited | Hospitality | 2019 |
| Cerebral Palsy Cymru | Health & social care | 1992 |
| Ceri Llewellyn Photography Ltd | Professional & scientific | 2025 |
| Ceridwen Studio Ltd | Information & communication | 2024 |
| Cerigo Heritage Consultancy Limited | Professional & scientific | 2024 |
| Cernia Services Limited | Education | 2025 |
| Ceronas Limited | Administrative & support | 2020 |
| Cerosi Limited | Professional & scientific | 2020 |
| Certatus Limited | Manufacturing | 2013 |
| Certax Teesside Limited | Professional & scientific | 2018 |
| Certel Engineering Services Limited | Construction | 2006 |
| Certified Forensic Accountants Ltd | Extraterritorial | 2020 |
| Certifiedads Digital Ltd | Other services | 2022 |
| Certiphase Electrical Ltd | Construction | 2021 |
| Certti Events Limited | Construction | 2019 |
| Cervihealth Ltd | Education | 2023 |
| Ceryn Consulting Limited | Professional & scientific | 2019 |
| Ceryn Engineering Ltd | Professional & scientific | 2026 |
| Ceryx Medical Limited | Professional & scientific | 2016 |
| CES Sport Limited | Wholesale & retail | 2019 |
| Cesky Canary Ltd | Administrative & support | 2020 |
| Cetindere Ltd | Wholesale & retail | 2025 |
| CEV Limited | Professional & scientific | 2016 |
| Ceviz Ltd | Hospitality | 2017 |
| Ceylan OWA Ltd | Information & communication | 2024 |
| Ceylex UK Ltd | Manufacturing | 2018 |
| Ceylon (Cardiff) Ltd | Wholesale & retail | 2022 |
| Ceylon M8 Ltd | Hospitality | 2025 |
| Ceylon Stone Ltd | Construction | 2022 |
| Ceyna Ltd | Wholesale & retail | 2022 |
| Ceyz C.I.C. | Education | 2021 |
| Ceza Alish Ltd | Wholesale & retail | 2025 |
| CF Car Parts Ltd | Wholesale & retail | 2025 |
| CF Car Sales Ltd | Wholesale & retail | 2026 |
| CF ENT Ltd | Hospitality | 2025 |
| CF Exchange Ltd | Information & communication | 2017 |
| CF Freight Limited | Transport & logistics | 2024 |
| CF Investments & Trading Ltd | Wholesale & retail | 2021 |
| CF Lotus Limited | Hospitality | 2024 |
| CF Online Ltd | Information & communication | 2019 |
| CF Orient Limited | Hospitality | 2025 |
| CF Pest Solutions Ltd | Administrative & support | 2025 |
| CF10 Retail Limited | Wholesale & retail | 2015 |
| CF10 Trading Limited | Hospitality | 2017 |
| CF11 Cars Ltd | Transport & logistics | 2019 |
| CF11 Plastering and Maintenance Ltd. | Construction | 2023 |
| CF14 Autos Ltd | Wholesale & retail | 2025 |
| CF24 Ltd | Real estate | 2014 |
| CF24 Security Ltd | Administrative & support | 2022 |
| CF24 Services Ltd | Information & communication | 2016 |
| CF3 Food Ltd | Hospitality | 2025 |
| CF3 MOT & Service Centre Ltd | Wholesale & retail | 2025 |
| CF39 Ltd | Real estate | 2021 |
| CF4 Financial Services Ltd | Administrative & support | 2016 |
| Cfac Limited | Arts & recreation | 1905 |
| CFB 88 Limited | Hospitality | 2022 |
| CFC Grill Ltd | Hospitality | 2026 |
| CFC Thorsten Schuell UK Ltd. | Information & communication | 2017 |
| CFC Tree & Forest Foundation | Agriculture & fishing | 2020 |
| CFJ (Midlands) Ltd | Wholesale & retail | 2024 |
| Cfln Ltd | Wholesale & retail | 2022 |
| CFO Auto Car Services Ltd | Wholesale & retail | 2024 |
| CFW Architects Limited | Professional & scientific | 2009 |
| CFX Communications Ltd | Information & communication | 2019 |
| CG Choma Ltd | Other services | 2025 |
| CG Decorators Ltd | Construction | 2012 |
| CG Group Pro Ltd | Wholesale & retail | 2025 |