| C M Hixon Builders Limited | Construction | 2012 |
| C M M Hospitality Limited | Hospitality | 2023 |
| C O B Management Ltd | Hospitality | 2019 |
| C Osborn Offshore Services Limited | Public administration | 2018 |
| C P Lubricants Limited | Wholesale & retail | 2002 |
| C S Assessment & Consultancy Services Limited | Professional & scientific | 2016 |
| C Squared Visions Limited | Professional & scientific | 2016 |
| C Three Marketing Ltd | Professional & scientific | 2004 |
| C Tuning Ltd | Wholesale & retail | 2020 |
| C&A Renovations Ltd. | Real estate | 2021 |
| C&C Professional Grooming Ltd | Administrative & support | 2025 |
| C&C Storage Services Ltd | Transport & logistics | 2022 |
| C&D Delivery Ltd | Construction | 2019 |
| C&D Plant & Construction Limited | Construction | 2012 |
| C&E Cleaning Services Limited | Administrative & support | 2024 |
| C&E FOX Ltd | Financial services | 2021 |
| C&F Everbright Cleaning Services Ltd | Administrative & support | 2026 |
| C&G Lifestyle Homes Ltd | Construction | 2014 |
| C&J Inns Limited | Wholesale & retail | 2007 |
| C&L Paving Ltd. | Construction | 2021 |
| C&M Building Solutions and Property Maintainance Ltd | Construction | 2020 |
| C&N Brickwork Ltd | Construction | 2024 |
| C&N Developments Ltd | Real estate | 2024 |
| C&N Exports Ltd | Wholesale & retail | 2024 |
| C&N Property Investors Ltd | Administrative & support | 2015 |
| C&T Properties Limited | Real estate | 2025 |
| C&W Construction Limited | Other services | 2016 |
| C-Diem Investments Limited | Real estate | 1993 |
| C. Billor Limited | Financial services | 2024 |
| C. Healey Ltd | Professional & scientific | 2018 |
| C. K. Allen Ltd | Administrative & support | 2016 |
| C. K. W Contractors Ltd | Construction | 2023 |
| C. M. E. Engineering Limited | | 1980 |
| C. Morgan & Sons (Motors & Spares) Limited | Real estate | 1963 |
| C. P Roofing and Construction Limited | Construction | 2025 |
| C. Thorne Building Ltd | Construction | 2016 |
| C. W. Painting and Decorating Limited | Construction | 2003 |
| C.A Askham Ltd | Real estate | 2024 |
| C.G. Comley & Sons Limited | Water & waste | 1982 |
| C.H.A Plumbing & Heating Limited | Construction | 2014 |
| C.J. Blue Homes Ltd | Real estate | 2024 |
| C.J. Spratt Limited | Wholesale & retail | 1987 |
| C.L.C. Contractors Limited | Construction | 1975 |
| C.M.F. Electrical Services Ltd | Construction | 2008 |
| C.Neo Ltd | Professional & scientific | 2024 |
| C.W.F. Poulten Limited | Manufacturing | 1971 |
| C.X.E.M.A Ltd | Other services | 2015 |
| C2 Coaching Ltd | Professional & scientific | 2022 |
| C38 Ltd | Information & communication | 2025 |
| C4 Draughting Limited | Professional & scientific | 2022 |
| CA Clothing 20 Limited | Wholesale & retail | 2023 |
| CA Contractors Ltd | Construction | 2020 |
| CAB My Ride Limited | Transport & logistics | 2010 |
| Caba Quantity Surveying Ltd | Professional & scientific | 2023 |
| Cabifyrentals Ltd | Transport & logistics | 2026 |
| Cabin Boatyard Limited | Transport & logistics | 2020 |
| Cabipa Limited | Wholesale & retail | 2012 |
| Caboodle Office Supplies Limited | Extraterritorial | 2026 |
| Cabooks & Returns Ltd | Professional & scientific | 2016 |
| Cabot Close RTM Company Limited | Households | 2021 |
| Cabwala Ltd | Transport & logistics | 2026 |
| Cacap Electrical Limited | Construction | 2014 |
| Cactus Tree Limited | Information & communication | 2022 |
| Cadence Projects Limited | Professional & scientific | 2016 |
| Cadencewave Limited | Health & social care | 2025 |
| Cadland Court Ltd | Real estate | 2023 |
| Cadnam Car Centre Ltd | Wholesale & retail | 2024 |
| Cadnam Fleet Management Ltd | Wholesale & retail | 2020 |
| Cadnam Garage Ltd | Wholesale & retail | 2013 |
| Caelith Holdings Limited | Financial services | 2026 |
| Caesar' Collections and Logistics Ltd | Transport & logistics | 2024 |
| Cafe Aroma Shirley Ltd | Hospitality | 2017 |
| Cafe Grec Ltd | Hospitality | 2025 |
| Cafe Parfait South Limited | Hospitality | 2015 |
| Caffe Britannia Limited | Hospitality | 2020 |
| Cahp Sales Limited | Financial services | 2011 |
| Caidr Limited | Professional & scientific | 2019 |
| Caig Sports Limited | Professional & scientific | 2022 |
| Cain Family Holding Company Limited | Financial services | 2017 |
| Caine Lacey Limited | Hospitality | 2010 |
| Cairnfinch Limited | Extraterritorial | 1980 |
| Cajal Accountancy Services Limited | Professional & scientific | 2004 |
| Cake Workshop Ltd | Hospitality | 2020 |
| Cakes by Victoria Limited | Manufacturing | 2017 |
| CAL Training Ltd | Professional & scientific | 2011 |
| Calanpoint Contracts Limited | Construction | 2002 |
| Calcutta Kitchen Ltd | Hospitality | 2023 |
| Caldan Management Limited | Administrative & support | 2025 |
| Caldav Ltd | Construction | 2026 |
| Caldwell Care Limited | Health & social care | 2002 |
| Cali Gold Ltd | Wholesale & retail | 2019 |
| Calibra Marine Equipment Limited | Wholesale & retail | 2013 |
| Calibra Marine International Limited | Wholesale & retail | 2001 |
| Caligold Export Ltd | Manufacturing | 2026 |
| Caligold Health Ltd | Wholesale & retail | 2023 |
| Call Services Ltd | Administrative & support | 2017 |
| Callaghan Wright Limited | Construction | 2026 |
| Callaway Carpentry Ltd | Manufacturing | 2025 |
| Callaway Energy Ltd | Manufacturing | 2016 |
| Callaway Roofing Ltd | Construction | 2023 |