| Coralblu Limited | Information & communication | 2018 |
| Corbutts Painting & Decorating Ltd | Administrative & support | 2017 |
| Cordoba - Esrec Trading AS Yusuf Shafi Ltd. | Real estate | 2011 |
| Core Access Rentals Ltd | Administrative & support | 2019 |
| Core Five Consulting Limited | Professional & scientific | 2012 |
| Core Five EOT Limited | Administrative & support | 2023 |
| Core Genius Limited | Professional & scientific | 2014 |
| Core Group Online Ltd | Wholesale & retail | 2017 |
| Core Retail Solutions Limited | Wholesale & retail | 2013 |
| Core Step Ltd | Wholesale & retail | 2026 |
| Corefive Management Services Ltd | Professional & scientific | 2021 |
| Coremove Logistics Limited | Transport & logistics | 2025 |
| Corespace Property Group Limited | Real estate | 2025 |
| Corinne Aaron & Co Limited | Real estate | 2025 |
| Cornatics Ltd | Administrative & support | 2018 |
| Cornerstone Ventures Limited | Real estate | 2026 |
| Cornerstones Group Ltd | Health & social care | 2017 |
| Cornerstones Properties Limited | Real estate | 2019 |
| Corongate Limited | | 1980 |
| Corpaci Interpreting Ltd | Professional & scientific | 2023 |
| Corporate City Investments Limited | Financial services | 2015 |
| Corporate Equity Limited | Professional & scientific | 2015 |
| Corporate News Ltd | Professional & scientific | 2024 |
| Corporate Prwire Ltd | Professional & scientific | 2025 |
| Corran Green Collective Limited | Professional & scientific | 2023 |
| Corveyt Ltd | Health & social care | 2021 |
| Corvix Services Ltd | Professional & scientific | 2025 |
| Corvusair Ltd | Professional & scientific | 2021 |
| Cosa Consult Ltd | Health & social care | 2016 |
| Cosabella Gift Company Limited | Wholesale & retail | 2013 |
| Cosafe Consultancy Ltd | Professional & scientific | 2025 |
| Coseley Electrical Services (Holdings) Limited | Financial services | 2022 |
| Coseley Electrical Services Limited | Construction | 2014 |
| Coseley Services (Holding Company) Ltd | Real estate | 2019 |
| Coseley Services Limited | Transport & logistics | 2002 |
| Coseley Systems Limited | Information & communication | 1996 |
| Cosey Comfortz Ltd | Wholesale & retail | 2024 |
| Cosinus Group Capital Partners (UK) Ltd | Professional & scientific | 2022 |
| Cosmetics Online Limited | Wholesale & retail | 2016 |
| Cosmetics R US 1 Limited | Wholesale & retail | 2016 |
| Cosmic Smoothies Ltd | Manufacturing | 2019 |
| Cosmosoft Limited | Manufacturing | 2015 |
| Cost 2 Cost Ltd | Wholesale & retail | 2022 |
| Cost Savers Local Ltd | Wholesale & retail | 2025 |
| Costcutter (Bushbury) Limited | Wholesale & retail | 2005 |
| Costmol Ltd | Construction | 2025 |
| Cosy Concentric Ltd | Construction | 2026 |
| Cosy Home Renting Limited | Real estate | 2024 |
| Cosy Homes UK Limited | Construction | 2004 |
| Cotex Solutions Limited | Administrative & support | 2023 |
| Cotford Limited | Administrative & support | 2022 |
| Coton Holdings Limited | Real estate | 2015 |
| Cotswold Construction Management Ltd | Construction | 2018 |
| Cotterill Engineering Limited | Construction | 2018 |
| Cotterill Plastering Limited | Real estate | 1975 |
| Couier Service UK Ltd | Transport & logistics | 2026 |
| Council of Gurdwaras Management Committee | Other services | 2018 |
| Counsellors Forum Limited | Other services | 2024 |
| Country Risk Company Limited | Professional & scientific | 2024 |
| Countrywalls Ltd | Real estate | 2024 |
| County Car Parks Ltd | Wholesale & retail | 2012 |
| County Events Limited | Hospitality | 2016 |
| Courage for Peace | Other services | 2011 |
| Courier AID Ltd | Transport & logistics | 2024 |
| Courier Wizard Ltd | Transport & logistics | 2025 |
| COURIER28 Ltd | Transport & logistics | 2026 |
| Courland Ventures Ltd | Administrative & support | 2015 |
| Courmacs LLP | | 2013 |
| Court Without a Lawyer, Community Interest Company | Professional & scientific | 2010 |
| Courtenay Properties LLP | | 2019 |
| Courtgate Investments Limited | Wholesale & retail | 2003 |
| Courtyard Wombourne Limited | Hospitality | 2017 |
| Cousins Street Plastics Ltd | Wholesale & retail | 2024 |
| Coutts Private Holdings Ltd | Financial services | 2026 |
| Coven Carpets and Flooring Ltd | Wholesale & retail | 2019 |
| Coven United FC Limited | Arts & recreation | 2023 |
| Covenest Limited | Hospitality | 2025 |
| Coventry Power Limited | Energy | 2022 |
| Cover Club Ltd. | Construction | 2017 |
| Coverall Construction Ltd | Construction | 2024 |
| Covert Watch Ltd | Professional & scientific | 2013 |
| Cowris Limited | Wholesale & retail | 2025 |
| COX Property Investments Limited | Real estate | 2024 |
| Cozan Limited | Households | 2025 |
| Cozens & Cole Limited | Wholesale & retail | 1961 |
| Cozy Homeware Limited | Wholesale & retail | 2025 |
| Cozyora Ltd | Wholesale & retail | 2026 |
| CP Finance Limited | Financial services | 2026 |
| CP Newco Limited | Financial services | 2025 |
| CP Real Estate Limited | Administrative & support | 2017 |
| CPC Plumbing and Heating Services Ltd | Construction | 2022 |
| CPC Training UK Ltd | Administrative & support | 2019 |
| CPM Care Clarity Ltd | Professional & scientific | 2025 |
| Cpmbs - Construction Project Management & Building Solutions Ltd | Construction | 2015 |
| CR 81 Ltd | Real estate | 2018 |
| Craft ALL Day Limited | Wholesale & retail | 2011 |
| Craftmaster Microbrew Limited | Manufacturing | 2015 |
| Craftybey Ltd | Wholesale & retail | 2024 |
| Craig Bowker Coaching Academy Ltd | Arts & recreation | 2018 |
| Crampton Property Investments Limited | Real estate | 2021 |