| Cenz Services Limited | Administrative & support | 2026 |
| CEO & Co Group Limited | Real estate | 2024 |
| CEO Konsulting Ltd | Wholesale & retail | 2020 |
| Cephei Trading Limited | Manufacturing | 2022 |
| CER III UK 01 Propco Limited | Real estate | 2021 |
| CER III UK 02 Propco Limited | Real estate | 2022 |
| CER III UK Residential 01 Holdco Limited | Professional & scientific | 2021 |
| CER III UK Residential 02 Limited | Real estate | 2025 |
| Ceracoat Industries Ltd | Administrative & support | 2014 |
| Ceracoat Ltd | Wholesale & retail | 2019 |
| Ceramic Pots Ltd | Extraterritorial | 2025 |
| Ceramic Tile Centre Limited | Wholesale & retail | 1997 |
| Ceramica DI Lusso Ltd | Construction | 2018 |
| Ceramique Internationale Limited | Construction | 1974 |
| Ceramo Limited | Wholesale & retail | 2020 |
| Ceranta Limited | Professional & scientific | 2005 |
| Ceravano Limited | Wholesale & retail | 2025 |
| Cerberus Asset Management Limited | Professional & scientific | 2000 |
| Cerberus Constructions Ltd | Construction | 2024 |
| Cerberus Enforcement Limited | Professional & scientific | 1991 |
| Cerberus FOX Ltd | Professional & scientific | 2015 |
| Cerberus Gate Ltd | Professional & scientific | 2023 |
| Cerberus Group 2000 Limited | Professional & scientific | 1999 |
| Cerberus Group Limited | Professional & scientific | 2003 |
| Cerberus Receivables Management Limited | Professional & scientific | 1997 |
| Cerebral Technology Ltd | Information & communication | 2013 |
| Cerebro Group Limited | Health & social care | 2016 |
| Cerebron Ltd | Information & communication | 2025 |
| Ceremony Creative Limited | Professional & scientific | 2020 |
| Ceric Limited | Information & communication | 2015 |
| Cernucci Limited | Extraterritorial | 2020 |
| Cerro Extruded Metals Limited | Manufacturing | 1998 |
| Cert Construction Management Ltd | Real estate | 2019 |
| Cert Investments Limited | Real estate | 2014 |
| Cert Property Group Limited | Financial services | 2018 |
| Cert Property Limited | Real estate | 2006 |
| Cert Residential Property Management Limited | Real estate | 2018 |
| Certa Holdings Limited | Real estate | 2014 |
| Certags Limited | Wholesale & retail | 2014 |
| Certain Exhibitions Limited | Manufacturing | 2008 |
| Certidry Damp Control Ltd | Construction | 2024 |
| CERTIFICATES4YOU Limited | Administrative & support | 2020 |
| Certified AD Partner Ltd | Wholesale & retail | 2025 |
| Certified Halal Poultry Ltd | Wholesale & retail | 2018 |
| Certified Installers Limited | Construction | 2020 |
| Certified Lettings Ltd | Real estate | 2019 |
| Certified Optics UK Limited | Wholesale & retail | 2021 |
| Certified Restoration DRY Cleaning Network (Europe) Limited | Other services | 2010 |
| Certified Restoration DRY Cleaning Network Limited | Other services | 2010 |
| Certify Assessment Solutions Ltd | Information & communication | 2013 |
| Certify Energy Limited | Administrative & support | 2021 |
| Certify Group Ltd | Administrative & support | 2025 |
| Certify Holdings Limited | Financial services | 2022 |
| Certify IT Limited | Information & communication | 2019 |
| Certify Renewables Limited | Administrative & support | 2021 |
| Certify Services Ltd | Real estate | 2021 |
| Certify Staffing Solutions Limited | Administrative & support | 2020 |
| Certis (Yorkshire) Accountants Ltd | Professional & scientific | 2014 |
| Certis Manc Accountants Ltd. | Professional & scientific | 2023 |
| Certitude Consultants Limited | Other services | 2014 |
| Certivohq Ltd | Information & communication | 2026 |
| Certo Legal Limited | Professional & scientific | 2024 |
| Certta Limited | Extraterritorial | 2014 |
| Certus Insights Ltd | Information & communication | 2025 |
| Certus Services Ltd | Information & communication | 2018 |
| Cerulean Business Solutions Limited | Professional & scientific | 2019 |
| Cervidae Consultancy Limited | Professional & scientific | 2013 |
| Cerys Shirley Properties Ltd | Real estate | 2025 |
| Cesco Projects Limited | Construction | 2011 |
| Cesef-Creative Minders Limited | Health & social care | 2023 |
| Ceseltar Ltd | Agriculture & fishing | 2026 |
| Cess LAB Limited | Administrative & support | 2021 |
| Cestrian Digital Ltd | Information & communication | 2026 |
| Cesur Limited | Hospitality | 2019 |
| Cetko Consultants Ltd | Health & social care | 2025 |
| Cetrolinear Limited | Financial services | 2014 |
| Cetus Continuum Limited | Information & communication | 2001 |
| Cetus Solutions Limited | Information & communication | 2002 |
| Cevian International Limited | Professional & scientific | 2025 |
| CEW Electrical Ltd | Construction | 2025 |
| Cexe Ltd | Wholesale & retail | 2021 |
| Cexn Wholesale Limited | Wholesale & retail | 2019 |
| Ceylon Digital Media Limited | Professional & scientific | 2020 |
| Ceylon Luxe Ltd | Wholesale & retail | 2024 |
| Ceylon Royale Ltd | Wholesale & retail | 2020 |
| Ceyvora Ltd | Wholesale & retail | 2026 |
| CF (2015) Ltd | Extraterritorial | 2015 |
| CF Assessments Limited | Health & social care | 2010 |
| CF Catering Ltd. | Hospitality | 2019 |
| CF Design and Build Limited | Construction | 2024 |
| CF Grit and Glory Limited | Arts & recreation | 2016 |
| CF Plastering Ltd | Construction | 2016 |
| CF Project Support Ltd | Information & communication | 2017 |
| CF Recruitment Agency Ltd | Administrative & support | 2018 |
| Cf&Mk Limited | Manufacturing | 2020 |
| Cfb-Uk Ltd | Professional & scientific | 2024 |
| CFD PROPCO1 Limited | Real estate | 2013 |
| CFD PROPCO2 Limited | Real estate | 2019 |
| CFI R&D Limited | Administrative & support | 2018 |
| Cfjl Property Partners Limited | Real estate | 2017 |