| Corbishley Property Ltd | Construction | 2026 |
| Corbishley Roofing & Cladding Limited | Construction | 2012 |
| Core AI Consulting Limited | Information & communication | 2024 |
| Core AI Limited | Information & communication | 2019 |
| Core Educational Ltd | Professional & scientific | 2018 |
| Core Group International Limited | Professional & scientific | 2023 |
| Core Resource Management Ltd | Real estate | 2026 |
| Core Software Services Limited | Information & communication | 1999 |
| Core Support Ltd | Information & communication | 2015 |
| Core UK Production Services Ltd | Arts & recreation | 2019 |
| Corecarts Limited | Wholesale & retail | 2025 |
| Corewell Solutions Limited | Transport & logistics | 2026 |
| Corinthian Stone Limited | Manufacturing | 1990 |
| Corkys Cars Midlands Ltd | Transport & logistics | 2011 |
| Corner Croft Properties Limited | Real estate | 2018 |
| Cornerstone Joinery Limited | Construction | 2018 |
| Cornfield Engineering Solutions Limited | Professional & scientific | 2007 |
| Cornhill Oatcakes Limited | Wholesale & retail | 2014 |
| Cornwallis Stoke Ltd | Real estate | 2019 |
| Corrdesa Limited | Professional & scientific | 2023 |
| Corryvreckan Consulting Limited | Administrative & support | 2022 |
| Cosmedic Aesthetics Limited | Health & social care | 2018 |
| Cosmic Commerce Limited | Wholesale & retail | 2020 |
| Cosmic Healing Education Limited | Education | 2026 |
| Cosmic Rust Animations Ltd | Arts & recreation | 2026 |
| Cosmin Paint & Body Ltd | Wholesale & retail | 2022 |
| Cosmo Aesthetics Limited | Other services | 2021 |
| Cosmo Haulage Ltd | Transport & logistics | 2015 |
| Costache Ltd | Transport & logistics | 2019 |
| Costel and SON Ltd Ltd | Transport & logistics | 2025 |
| Costel Ghiurcanas Ltd | Manufacturing | 2024 |
| Costi Motors Ltd | Wholesale & retail | 2024 |
| Costumes for Kids Limited | Extraterritorial | 2006 |
| Cosy Cruise Cribs Ltd | Households | 2023 |
| Cosy Cruise Travel Limited | Transport & logistics | 2008 |
| COSYCORNERS01 Ltd | Wholesale & retail | 2024 |
| Coton Hall Developments Limited | Extraterritorial | 2012 |
| Cotswold Private GP Service Limited | Health & social care | 2024 |
| Cott & SON Ltd | Real estate | 2025 |
| Cottage Cars Ltd | Wholesale & retail | 2020 |
| Cottage Catering Services Ltd | Wholesale & retail | 2022 |
| Cottenham Computer Services Limited | Information & communication | 2013 |
| Cotton Yates Partnership Ltd | Professional & scientific | 2021 |
| Couch Craftworks Limited | Manufacturing | 2024 |
| Coulson Ventures Limited | Transport & logistics | 2021 |
| Countio Limited | Information & communication | 2024 |
| Country Crumbs Ltd | Wholesale & retail | 2026 |
| Country Interests Investments Limited | Financial services | 2023 |
| Country Interests Limited | Wholesale & retail | 2015 |
| Countryside Revival Ltd | Administrative & support | 2020 |
| County Metals Limited | Manufacturing | 2000 |
| Courtway Engineers Limited | | 1982 |
| Covenant Constructions Ltd | Construction | 2024 |
| Cowell Consulting Limited | Information & communication | 1998 |
| Cowl Fitting Services Limited | Construction | 2003 |
| COX & Co (Chocolates) Limited | Wholesale & retail | 2021 |
| COX & Co Developments Limited | Construction | 2008 |
| Cozihomes Limited | Professional & scientific | 1989 |
| Cozy Home Insulation Ltd | Construction | 2023 |
| CP Assembly Limited | Administrative & support | 2005 |
| CP Legal Consulting Ltd | Professional & scientific | 2021 |
| CP Project Consulting Limited | Information & communication | 2025 |
| CP Residential Limited | Real estate | 2017 |
| Cpfb Hanley Ltd | Real estate | 2024 |
| Cpfb Lomas Ltd | Construction | 2026 |
| Cpfb Properties Ltd | Real estate | 2023 |
| CPG Property Renovations Ltd | Construction | 2024 |
| CPR Renovations Ltd | Construction | 2016 |
| CPS Plumbing & GAS Limited | Construction | 2016 |
| CPV Builders Limited | Construction | 2025 |
| CR Holdings (Staffs) Limited | Financial services | 2020 |
| Crab Housing Ltd | Real estate | 2026 |
| Craft and Design Limited | Extraterritorial | 2021 |
| Craft Electrical & Solar Ltd | Construction | 2022 |
| Craftholm Ltd | Wholesale & retail | 2026 |
| Craftsman MB Ltd | Other services | 2024 |
| Crafty Creations MCR Ltd | Manufacturing | 2021 |
| Craig Johnson Limited | Real estate | 2008 |
| Craig Mason Construction Limited | Real estate | 2015 |
| Craig Oakley Ltd | Construction | 2014 |
| Craltec Limited | Other services | 2025 |
| Cranage Haulage Limited | Wholesale & retail | 2004 |
| Cranage Holdings Limited | Financial services | 2018 |
| Cranes Healthcare Services Limited | Administrative & support | 2021 |
| Craw Road Limited | Information & communication | 2018 |
| Crawford & Beattie Ltd | Information & communication | 2025 |
| Craze Sales. Limited | Wholesale & retail | 2025 |
| Crazy Dreams Ltd | Wholesale & retail | 2025 |
| CRE Investment Properties Ltd | Real estate | 2026 |
| CRE8TIVE Dzines Ltd | Professional & scientific | 2026 |
| Cream Health & Social Care Ltd | Administrative & support | 2011 |
| Cream Health Care Limited | Administrative & support | 2023 |
| Cream Health Co Ltd | Administrative & support | 2025 |
| Cream Home Care Limited | Health & social care | 2009 |
| Creambay Limited | Professional & scientific | 2000 |
| Creare Building Design Ltd | Construction | 2024 |
| Create Place Ltd | Professional & scientific | 2025 |
| Create the Space Limited | Administrative & support | 2016 |
| Create Your Taste Ltd | Hospitality | 2026 |
| Creative Business School Limited | Financial services | 2015 |