| CCS Home Eco Limited | Construction | 2022 |
| CDS Lift Services Limited | Construction | 2022 |
| CDW Management Ltd | Financial services | 2025 |
| Cedar Andover Limited | Extraterritorial | 2013 |
| Celebes Ltd | Information & communication | 2021 |
| Celestial FIX Ltd | Professional & scientific | 2024 |
| Celia Coles Ltd | Professional & scientific | 2024 |
| Central Enterprise Holdings Ltd. | Information & communication | 2003 |
| Cephas Picture Library Limited | Professional & scientific | 1995 |
| Cerebral Power Conditioning Limited | Administrative & support | 2024 |
| Ceremonies and Events (Northern) Limited | Manufacturing | 2017 |
| Ceremonies and Events Limited | Manufacturing | 2017 |
| Chai Fusion Ltd | Hospitality | 2026 |
| Chaitali Properties Ltd | Real estate | 2023 |
| Chakra Psychics Ltd | Health & social care | 2022 |
| Chalkcroft Group Ltd. | Professional & scientific | 2023 |
| Chalkcroft Wealth Management Ltd | Financial services | 2015 |
| Challenger Sports Basingstoke Ltd | Education | 2019 |
| Champ Technology Limited | Professional & scientific | 2010 |
| Champions for Tomorrow Limited | Arts & recreation | 2025 |
| Chanah Group of Companies Limited | Wholesale & retail | 2025 |
| Chanail Ltd | Other services | 2022 |
| Chantry Horsefair Limited | Real estate | 2024 |
| Chappell Builders Limited | Construction | 2002 |
| Charles Liddell Design Limited | Professional & scientific | 2019 |
| Charles Marshall Consulting Ltd | Professional & scientific | 2025 |
| Charlie Pike Racing Limited | Arts & recreation | 2025 |
| Charlton Consultancy Ltd | Professional & scientific | 2024 |
| Charlton Hill Medical Limited | Health & social care | 2015 |
| Charlton Village Convenience Ltd | Wholesale & retail | 2020 |
| Chartered Land Limited | Real estate | 1990 |
| Chattis Hill Power Ltd | Other services | 2021 |
| Chawla Systems Limited | Information & communication | 2022 |
| Chefsia Ltd | Hospitality | 2018 |
| Chell Web & Design Ltd | Information & communication | 2024 |
| Cherished Moments Studio Limited | Professional & scientific | 2025 |
| Cherrywell Property Limited | Real estate | 2017 |
| Chevron Brands Limited | Wholesale & retail | 2019 |
| Chic Cane Limited | Wholesale & retail | 2007 |
| Chiden Ltd | Health & social care | 2026 |
| Chilled Mouse Ltd | Information & communication | 2014 |
| Chilli Consultancy Ltd | Professional & scientific | 2014 |
| China Challenge Ltd | Education | 2010 |
| Chiros Limited | Health & social care | 2002 |
| Chlen Vied Ltd | Wholesale & retail | 2025 |
| Chloride Extraction Technologies Limited | Manufacturing | 2010 |
| Choices Hire Limited | Other services | 2017 |
| Chris Collins Painting and Decorating Limited | Construction | 2009 |
| Chris Staple Associates Limited | Information & communication | 2001 |
| Churchlake Hillview Ltd | Health & social care | 2017 |
| Chute Forest Limited | Agriculture & fishing | 1996 |
| Chute Garden Design Limited | Administrative & support | 2022 |
| Chute Investments Limited | Financial services | 2019 |
| Cibus Training and Consultancy Limited | Hospitality | 2017 |
| Ciguatera Partners LLP | | 2017 |
| Circular Software Limited | Information & communication | 2012 |
| CIS Data Security Ltd | Information & communication | 2019 |
| City Vehicle Management Limited | Other services | 2011 |
| CJ Consulting Hampshire Ltd | Professional & scientific | 2017 |
| Cjed Consulting Ltd | Professional & scientific | 2024 |
| CJH Property Development Ltd | Construction | 2023 |
| CJW Garden Care Ltd | Other services | 2017 |
| CKI Consultancy Limited | Professional & scientific | 2022 |
| CL Property Maintenance Ltd | Construction | 2025 |
| Cladrite Southern Limited | Construction | 2020 |
| Clarion HR Limited | Administrative & support | 2025 |
| Clarion Quality GXP UK Limited | Professional & scientific | 2020 |
| Clarity Business Services Support Ltd | Administrative & support | 2013 |
| Clarity ROV Services Ltd | Information & communication | 2025 |
| Clark Capital Five Ltd | Financial services | 2024 |
| Clarkes Construction & Sons Limited | Construction | 2025 |
| Classic Travelling (UK) Ltd | Administrative & support | 2008 |
| Classic Travelling Limited | Administrative & support | 2003 |
| Classic Travelling Luggage Ltd | Wholesale & retail | 2019 |
| Clatford Consulting Ltd | Information & communication | 2026 |
| Clatford Manor Estate Company Limited | Administrative & support | 1994 |
| Clatford Properties Limited | Hospitality | 2021 |
| Clayden Consulting Limited | Professional & scientific | 2010 |
| Clean ME Ltd | Administrative & support | 2026 |
| Cleanastic Ltd | Transport & logistics | 2020 |
| Cleaning Godmother Cleaning Services Ltd | Administrative & support | 2016 |
| Cleanracing Limited | Wholesale & retail | 2023 |
| Clear Edge Strategies Ltd | Professional & scientific | 2025 |
| Clear Results Limited | Information & communication | 2008 |
| Clement Consulting and Coaching Ltd | Professional & scientific | 2016 |
| Cleopatra Promotion Limited | Professional & scientific | 2016 |
| Clothyard Consulting Ltd | Professional & scientific | 2023 |
| Cloud Bullion Ltd | Administrative & support | 2025 |
| Cloud Chasers 27 Ltd | Wholesale & retail | 2026 |
| Cloud Metals Ltd | Administrative & support | 2025 |
| Cloud Trade Limited | Administrative & support | 2025 |
| Cloudpay Holdings Limited | Professional & scientific | 2003 |
| Cloudpay Technology Limited | Information & communication | 2003 |
| Cloudpay Treasury Services Limited | Information & communication | 2021 |
| Cloudpay United Kingdom Limited | Information & communication | 1998 |
| CNC Lifts Ltd | Manufacturing | 2010 |
| Co-Off Ltd | Wholesale & retail | 2023 |
| Coaching Odysseus Ltd | Other services | 2025 |
| Coburg Advisory Ltd. | Professional & scientific | 2016 |
| Coco & Tiger Limited | Manufacturing | 2004 |