| Ceanos (Portsmouth) Limited | Hospitality | 2020 |
| Ceanos (Southampton) Limited | Hospitality | 2021 |
| CEC Electrical Services Limited | Construction | 2018 |
| Cedarwalk Limited | Extraterritorial | 1989 |
| Cellutrax Ltd | Information & communication | 2010 |
| Celpol Construction Ltd | Construction | 2014 |
| Celsius Hire Ltd | Construction | 2020 |
| Cema Food Ltd | Hospitality | 2021 |
| CF Spice Limited | Hospitality | 2026 |
| CGA Accountancy Winchester Limited | Professional & scientific | 1995 |
| Cgam Ltd. | Construction | 2017 |
| CH Engineering Design Ltd | Professional & scientific | 2020 |
| CH4 HPS Limited | Construction | 2011 |
| Chaarat Gold Services Limited | Mining & quarrying | 2018 |
| Chaddah Developments Limited | Construction | 2024 |
| Chae Garage Services Limited | Administrative & support | 2001 |
| Chai Heaven Limited | Hospitality | 2023 |
| Chainsaw Attachments Limited | Agriculture & fishing | 2016 |
| Challenge Alarm Services Limited | Other services | 2001 |
| Chamberlains Aqua and Energy Systems Limited | Water & waste | 2017 |
| Champions Golf Tour Ltd | Arts & recreation | 2020 |
| Champions of Soul Ltd | Other services | 2017 |
| Chana Solutions Ltd | Professional & scientific | 2019 |
| Chandlers Ford Bookkeeping Ltd | Professional & scientific | 2014 |
| Chandlers Ford Chinese Acupuncture Centre Limited | Health & social care | 2017 |
| Chandlers Ford Fencing Ltd | Real estate | 2024 |
| Chandlers Ford Garage Ltd | | 2008 |
| Chandlers Plumbing Ltd | Construction | 2015 |
| Chandlers the HR Consultancy Limited | Administrative & support | 2014 |
| Chandlersford Soton Ltd | Hospitality | 2025 |
| Change Masters International Limited | Professional & scientific | 2001 |
| Change Styles Ltd | Wholesale & retail | 2023 |
| Changes for Stammerers Ltd | Education | 2025 |
| Channel Distribution Limited | Professional & scientific | 1981 |
| Chapelgate Films Ltd. | Information & communication | 2014 |
| Charlene Kidd Coaching Ltd | Administrative & support | 2019 |
| Charles Rowley(Animal By-Products)Limited | Wholesale & retail | 1944 |
| Charlesco Limited | Administrative & support | 2009 |
| Charlotte Court Management Company (Yeovil) Limited | Extraterritorial | 2004 |
| Charlotte Crouch Ltd | Wholesale & retail | 2026 |
| Charlotte Mede Estates Limited | Households | 2011 |
| Chatsworth Garden Centre Limited | Wholesale & retail | 1980 |
| Chawton Holdings Limited | Professional & scientific | 2017 |
| Checks Happy Ltd | Other services | 2022 |
| Chemplicity Limited | Education | 2011 |
| Chemtech Industries Limited | Manufacturing | 1988 |
| Chemtech International Limited | Manufacturing | 1991 |
| Cherrywood (Fair Oak) Management Limited | Households | 2009 |
| Chess Publishing Limited | Information & communication | 2002 |
| Chester Garden Centre Limited | Wholesale & retail | 1978 |
| Chestnut Mortgages Limited | Financial services | 2018 |
| Chestnuthill Developments (Hampshire) Limited | Construction | 2017 |
| Chief Technology Limited | Information & communication | 2025 |
| Chilcomb (Winchester) LLP | | 2015 |
| Childsbridge Properties Limited | Real estate | 1989 |
| Chilworth Group Ltd | Professional & scientific | 2025 |
| Chime UK Digital Health Limited | Other services | 2026 |
| Chime UK Digital Health Trading Limited | Professional & scientific | 2026 |
| China Outsourcing (Europe) Limited | Wholesale & retail | 2002 |
| Chinese Stamps Ltd | Wholesale & retail | 2019 |
| Chinese Technical Translations Ltd | Professional & scientific | 2018 |
| Chlead Ltd | Professional & scientific | 2011 |
| Choices Curtains and Blinds Ltd | Wholesale & retail | 2015 |
| Choices Eastleigh Limited | Hospitality | 2019 |
| Choices Training & Development Limited | Education | 2015 |
| Choto Media Limited | Wholesale & retail | 2022 |
| Chris Heather Chef Solutions Ltd | Hospitality | 2019 |
| Chris Jordan Orthopaedics Ltd | Health & social care | 2022 |
| Chrisash Ltd | Health & social care | 2024 |
| Christ Church (Carterton) Limited | Administrative & support | 2010 |
| Christ Church (Daventry) Limited | Administrative & support | 2017 |
| Christ Church (Evesham) Limited | Professional & scientific | 2011 |
| Christ Church Developments Limited | Education | 2004 |
| Christ Church Library Services Limited | Energy | 1994 |
| Christ Church Oxford Trading Limited | Administrative & support | 2009 |
| Christopher Sharp Ltd | Professional & scientific | 2017 |
| Chrogean Limited | Other services | 2011 |
| Chrome Assets Ltd | Real estate | 2018 |
| Chrome Property Solutions Ltd | Real estate | 2016 |
| CHS Advisory Ltd | Professional & scientific | 2025 |
| Chunky Soton Ltd | Hospitality | 2023 |
| Church Road Conversion Ltd | Construction | 2026 |
| Church Street (West Hanney) Management Company Limited | Households | 2011 |
| Churcher Investments Ltd | Financial services | 2025 |
| Churches Fire Security Ltd. | Administrative & support | 1992 |
| Ciecw Consultancy Limited | Professional & scientific | 2023 |
| Cindele Limited | Professional & scientific | 2012 |
| Cinnamon Role Productions Limited | Information & communication | 2016 |
| Circe and Co Artisans Ltd | Wholesale & retail | 2024 |
| City Park (Hove) Management Company Limited | Real estate | 2006 |
| City West Southampton Limited | Real estate | 2017 |
| CJ & AG Brown Ltd | Hospitality | 2009 |
| CJ Interiors and Maintenance Ltd | Construction | 2025 |
| CJB Fusion Fabrication Ltd | Construction | 2015 |
| CJM Accountancy & Taxation Services Ltd | Professional & scientific | 2009 |
| CJP Flooring Ltd | Construction | 2019 |
| CJR Brickwork Limited | Construction | 2013 |
| CJS UK Limited | Information & communication | 2000 |
| CK Carpentry & Building Ltd | Manufacturing | 2021 |
| Claires Property Management Ltd | Real estate | 2024 |