| Ccbs Holdings Limited | Financial services | 2025 |
| Ccbs Investments Ltd | Real estate | 2022 |
| CCD Real Estate Ltd | Real estate | 2025 |
| CCI Live (Complex Cardiovascular Interventions) Limited | Health & social care | 2024 |
| CCL (Northeast) Ltd | Wholesale & retail | 2014 |
| CCL Hire Ltd | Wholesale & retail | 2014 |
| CCL Office Limited | Wholesale & retail | 2003 |
| Ccmdt Limited | Construction | 2026 |
| Ccne Limited | Wholesale & retail | 2012 |
| CCO Ltd | Wholesale & retail | 2014 |
| CCP Property and Maintenance Limited | Construction | 2023 |
| CCR Building & Maintenance Limited | Construction | 2018 |
| Ccrl Ltd | Real estate | 2025 |
| CCS Electrical Services NE Ltd | Construction | 2025 |
| CCS Training (Care) Limited | Public administration | 2025 |
| CD Catering and Consulting Ltd | Hospitality | 2024 |
| CD Flooring Pelton Ltd | Wholesale & retail | 2019 |
| CD Hill Ltd | Health & social care | 2024 |
| CD Recruitment Ltd | Administrative & support | 2025 |
| CD Windows and Doors Ltd | Construction | 2024 |
| CDA Pet Food Bank Community Interest Company | Other services | 2022 |
| Cdchase Ltd | Professional & scientific | 2018 |
| CDK Property Management Ltd | Households | 2026 |
| Cdkv Property Limited | Real estate | 2019 |
| Cdm.Mbs Properties Ltd | Real estate | 2024 |
| CDR Engineering Ltd | Education | 2024 |
| Cdtuk Ltd | Transport & logistics | 2019 |
| Cdtuk Recruitment Ltd | Administrative & support | 2019 |
| CDW Consultants Limited | Professional & scientific | 2023 |
| CE Maintenance Ltd | Construction | 2024 |
| Cead Limited | Construction | 2010 |
| Ceas 2604 Limited | Wholesale & retail | 2023 |
| Cecil Court Ponteland Management Limited | Households | 1991 |
| Cedar Forge Ltd | Information & communication | 2026 |
| Cedars (Orchard House) Management Company Limited | Real estate | 2005 |
| Cefra&Co Limited | Real estate | 2025 |
| Ceimless Technology Group Limited | Information & communication | 2020 |
| CEK Accounts Limited | Professional & scientific | 2018 |
| Celergate Limited | Information & communication | 2010 |
| Celerwheels Limited | Education | 2024 |
| Celestial Networks Ltd | Information & communication | 2024 |
| Celine RDC Ltd | Wholesale & retail | 2025 |
| Celium Consulting Ltd | Information & communication | 2024 |
| Cellfluidx Ltd | Manufacturing | 2020 |
| Celsius Real Estate LLC Ltd | Real estate | 2025 |
| Cenelec Standards Inspections Limited | Manufacturing | 1986 |
| Cenergist Limited | Administrative & support | 2012 |
| Cenovo Ltd | Wholesale & retail | 2016 |
| Central Bark North East Limited | Other services | 2012 |
| Central Bean Limited | Hospitality | 2006 |
| Central Computing Services Ltd | Wholesale & retail | 2010 |
| Central Employment Agency (North East) Limited | Administrative & support | 1987 |
| Central Exchange (Management) Limited | Real estate | 2005 |
| Central Grange (Kenton) Management Company Limited | Households | 2004 |
| Central Insurance Consultants Limited | Financial services | 1997 |
| Central Middlesex Hospital Project Limited | Other services | 2003 |
| Central Park Darlington Management Company Limited | Real estate | 2014 |
| Central Powergrid Limited | Extraterritorial | 2011 |
| Central Properties (Durham) Limited | Real estate | 1963 |
| Central Properties NE Ltd | Real estate | 2024 |
| Central Space Limited | Real estate | 2019 |
| Central Spice UP Ltd | Hospitality | 2024 |
| Central Store Newcastle Ltd | Wholesale & retail | 2018 |
| Centre West (Newcastle) | Administrative & support | 2002 |
| Centrechem Holdings Ltd | Financial services | 2023 |
| Centrechem Limited | Wholesale & retail | 1987 |
| Centred Chiropractic Limited | Health & social care | 2007 |
| Centreville DS Limited | Wholesale & retail | 2015 |
| Centrex Computing Services Limited | Other services | 2006 |
| Centrex Maintenance Limited | Construction | 2005 |
| Centurion Chase Management Company Limited | Households | 2023 |
| Century Idea UK Co. Ltd. | Administrative & support | 2013 |
| Century Travel (Newcastle Upon Tyne) Limited | Extraterritorial | 1996 |
| Centurysquare Limited | Professional & scientific | 2001 |
| CEO Chem Ltd | Wholesale & retail | 2023 |
| CEO Watches UK Ltd | Wholesale & retail | 2022 |
| Ceocare Ltd | Wholesale & retail | 2023 |
| Ceolwulph Limited | Households | 2004 |
| Ceraworks Limited | Manufacturing | 2025 |
| Cereal Kingdom Ltd | Wholesale & retail | 2026 |
| Certass Limited | Other services | 2002 |
| Certass TA Limited | Other services | 2018 |
| Certified Technologies Limited | Information & communication | 2015 |
| CERTIFIED4MOTORS Ltd | Professional & scientific | 2025 |
| Cetis LLP | | 2015 |
| Ceto AI Limited | Information & communication | 2020 |
| CEVIAN55 Ltd | Financial services | 2016 |
| Cevoymad Ltd | Health & social care | 2025 |
| Ceylon Motec UK Ltd | Wholesale & retail | 2024 |
| CFI 001 Limited | Financial services | 2023 |
| CFI 004 Limited | Real estate | 2024 |
| CFI 005 Limited | Financial services | 2024 |
| CFS Independent Financial Advisers Limited | Financial services | 2017 |
| Cfspray Solution Ltd | Construction | 2025 |
| CG Coatings and Access Ltd | Construction | 2020 |
| CG Ventures Limited | Professional & scientific | 2022 |
| Cg.Pti Ltd | Other services | 2019 |
| CGD7 Ltd | Real estate | 2019 |
| CGF Products Limited | Extraterritorial | 2004 |
| CH Hospitality Ltd | Administrative & support | 2025 |