| Busa Adri Ltd | Wholesale & retail | 2026 |
| Bushmead Court Management Limited | Households | 2002 |
| Business Accounting Services (Leamington ) Limited | Professional & scientific | 2024 |
| Business Accounting Services (Warwick) Limited | Professional & scientific | 2016 |
| Butcher Arms (Priors Hardwick) Limited | Real estate | 2026 |
| Butchers Butties Ltd | Hospitality | 2022 |
| Butterfly Meadows: Nursery & Pre-School Ltd | Health & social care | 2026 |
| BV Technology Services Ltd | Information & communication | 2024 |
| BWM WAR Limited | Financial services | 2021 |
| BX3 Property Development Limited | Construction | 2024 |
| Bynx Europe Limited | Information & communication | 1993 |
| Bynx Limited | Professional & scientific | 1996 |
| C & a R Ellis Ltd | Administrative & support | 2024 |
| C & S Taylor LLP | | 2010 |
| C B D Technology Ltd | Wholesale & retail | 2019 |
| C C Catering Ltd | Hospitality | 2025 |
| C H S P Properties Limited | Real estate | 2020 |
| C Konzen Merchants Capital UK Ltd | Financial services | 2024 |
| C Partridge Limited | Real estate | 2007 |
| C R Adams & Sons Ltd | Agriculture & fishing | 2008 |
| C&C Communications Limited | Information & communication | 1975 |
| C-Mac SMT Limited | Manufacturing | 2018 |
| C-Tex Limited | Manufacturing | 2015 |
| C.P. Hart & Sons Limited | Wholesale & retail | 1966 |
| C4 Strategic Ltd | Administrative & support | 2021 |
| C4S Group Limited | Financial services | 2023 |
| C60 Holdings Limited | Other services | 2022 |
| C7V Limited | Professional & scientific | 2016 |
| CAD94 Ltd | Professional & scientific | 2023 |
| Cafe 81 Limited | Wholesale & retail | 2020 |
| Cafe Italiana Ltd | Hospitality | 2025 |
| Cafesserie Food Ltd | Hospitality | 2025 |
| Caffeine Project Coffee Roasters Ltd | Manufacturing | 2020 |
| Caffeine Project Leamington Ltd | Hospitality | 2026 |
| Cake Day Ltd | Manufacturing | 2023 |
| Cakebreads Limited | Professional & scientific | 2005 |
| Cal-Stan Consulting Ltd | Professional & scientific | 2023 |
| Cali Camper Connection Ltd. | Wholesale & retail | 2023 |
| Callisto Property Investments Ltd | Real estate | 2025 |
| Callold Investments Limited | Professional & scientific | 2010 |
| Callum Automotive Ltd | Manufacturing | 2024 |
| Callum Creative Ltd | Manufacturing | 2020 |
| Calor GAS International Limited | Transport & logistics | 1963 |
| Calor GAS Limited | Wholesale & retail | 1935 |
| Calor Group Limited | Professional & scientific | 1987 |
| Calor Pension Trust Limited | Financial services | 1964 |
| Calor Properties Limited | Professional & scientific | 2012 |
| CAM Civils and Landscaping Ltd | Administrative & support | 2019 |
| CAM Flowers Limited | Wholesale & retail | 2025 |
| CAM Housing and Developments Limited | Real estate | 2025 |
| CAM Plant Holdings Ltd | Financial services | 2025 |
| CAM Plant Services Ltd | Construction | 2021 |
| Camdela Limited | Information & communication | 2026 |
| Campagne Homes Limited | Real estate | 2022 |
| Campbell Marsh Communications Limited | Extraterritorial | 2002 |
| Campbellmac Developments Ltd | Real estate | 2023 |
| Campion Vaughan Ltd | Information & communication | 2017 |
| Camrider Warwick Ltd | Education | 2012 |
| Caneyuk Limited | Financial services | 2022 |
| Canopy Nurseries Limited | Administrative & support | 2020 |
| Canopy Nursery Bicester Limited | Health & social care | 2026 |
| Cape Road Management (Warwick) Limited | Households | 2018 |
| Capital Savings Limited | Financial services | 2021 |
| Car 2000 Limited | Wholesale & retail | 1996 |
| Car Lease Aggregation Limited | Information & communication | 2024 |
| Carbon Free Future Ltd | Professional & scientific | 2023 |
| Carbon Sherpa Limited | Professional & scientific | 2025 |
| CARBON3IT Ltd | Information & communication | 2009 |
| Carbonaro Properties Limited | Real estate | 2022 |
| Cardtrend UK Limited | Information & communication | 2022 |
| Care With Integrity Limited | Health & social care | 2016 |
| Carebridge Healthcare Ltd | Administrative & support | 2023 |
| Career Seekers Direct Limited | Administrative & support | 2017 |
| Carers in Partnership Community Interest Company | Health & social care | 2007 |
| Carlatton Property Limited | Real estate | 2018 |
| Carlfors Bruk Limited | Wholesale & retail | 2019 |
| Carlow Investments & Holdings (UK & Ireland) Ltd | Real estate | 1998 |
| Carlyan Occupational Health (OH ) Consultancy Ltd | Health & social care | 2024 |
| Carmen 'S Care Ltd | Health & social care | 2026 |
| Carpe Diem Private Client Ltd | Financial services | 2017 |
| Carpet Ideas Ltd | Wholesale & retail | 2008 |
| Carrotstick Ltd | Information & communication | 2023 |
| Carrs Court Limited | Households | 1995 |
| Carry Cuddles Ltd | Administrative & support | 2017 |
| Cartesian Wealth Limited | Financial services | 2021 |
| Carus PBS UK Ltd | Extraterritorial | 2012 |
| Carve Team Ltd | Professional & scientific | 2025 |
| Casa Luker Limited | Wholesale & retail | 2020 |
| Casey Business Ltd | Professional & scientific | 2025 |
| Casini Limited | Professional & scientific | 2013 |
| Caspin Journeys Limited | Administrative & support | 2010 |
| Castle Balti Ltd | Hospitality | 2023 |
| Castle Codes Limited | Professional & scientific | 2014 |
| Castle Driving Academy Ltd | Transport & logistics | 2026 |
| Castle Garage Doors Ltd | Administrative & support | 2018 |
| Castle HR Limited | Administrative & support | 2005 |
| Castle Hydraulics and Pneumatics Limited | Manufacturing | 1991 |
| Castle Kebab Pizza Ltd | Hospitality | 2026 |
| Castle Leys (Warwick) Management Limited | Real estate | 2000 |
| Castle Motor Services Limited | Administrative & support | 2025 |