| C. & R. Fencing Limited | Construction | 1981 |
| C.S. Simmons Engineering Limited | Manufacturing | 1976 |
| C.T. Coaches Ltd | Transport & logistics | 2025 |
| Cacti Consulting Limited | Professional & scientific | 2021 |
| Cadwell Commercials Limited | Real estate | 2020 |
| Caged Laser Engineering (SW) Ltd | Manufacturing | 2017 |
| Cake TIN Foods Ltd | Manufacturing | 2020 |
| CAM Plant Hire Limited | Construction | 1990 |
| CAM Valley Grab Hire Limited | Water & waste | 2023 |
| CAM Valley Sports Club Limited | Arts & recreation | 2019 |
| Cameley Construction (South West) Ltd | Construction | 2013 |
| Campus Link Limited | Energy | 2010 |
| Canal Court Trowbridge Management Limited | Households | 1997 |
| Cancanpizza Limited | Hospitality | 2023 |
| Candy Lettings Limited | Real estate | 2023 |
| Candy Travel Ltd | Administrative & support | 2023 |
| Canford Global Ltd | Administrative & support | 2018 |
| Capture Compose Ltd | Information & communication | 2022 |
| Caravan Repairs Limited | Manufacturing | 2008 |
| Carbon Aware Productions Limited | Health & social care | 2020 |
| Carnwennan Limited | Information & communication | 2022 |
| Caroline Stovell Coaching Ltd | Education | 2026 |
| Cassidy Gregory Electrical Contractors Limited | Energy | 2009 |
| Cassidy Gregory Properties Ltd | Real estate | 2018 |
| CBS Contracting Limited | Construction | 2026 |
| Centurion Tours Limited | Administrative & support | 2013 |
| Cepenpark Services Limited | Information & communication | 2000 |
| Cerebral Security Solutions Ltd | Administrative & support | 2018 |
| CFH Intellectual Investments EBT Limited | Financial services | 2019 |
| CFH Intellectual Investments Limited | Financial services | 2019 |
| CFH Investments EBT Limited | Financial services | 2019 |
| CFH Investments Limited | Financial services | 2019 |
| CFH Propco Limited | Real estate | 2017 |
| CFH Services Limited | Extraterritorial | 1981 |
| CH Fashion Design Consulting Limited | Professional & scientific | 2016 |
| CH Group Southwest Limited | Professional & scientific | 2026 |
| Chained and Charged Ltd | Wholesale & retail | 2020 |
| Chapel Lawns Clandown Management Company Ltd | Households | 2021 |
| Chard Properties (SW) Ltd | Real estate | 2026 |
| Charles Parade Developments Limited | Construction | 2026 |
| Charlton Properties Limited | Real estate | 2017 |
| Charlynch Ltd | Extraterritorial | 2020 |
| Chateau DU Savon Limited | Wholesale & retail | 2021 |
| Chew Valley Hide & Skin Company Limited | Manufacturing | 1977 |
| Chew Valley Sports CIC | Arts & recreation | 2024 |
| Chief Consultancy Limited | Information & communication | 2013 |
| Chilcompton Cleaning Services Limited | Administrative & support | 2016 |
| Chilcompton Construction Limited | Administrative & support | 2014 |
| Chilcompton Road 18/11/1964 Limited | Extraterritorial | 2014 |
| Chipnsmash Ltd | Hospitality | 2026 |
| Chloe Optics Ltd | Professional & scientific | 2024 |
| Christopher Park Limited | Health & social care | 2010 |
| Chronologic Ltd | Administrative & support | 1999 |
| Church Lane Management Company (Midsomer Norton) Limited | Households | 1975 |
| Church View Stud Ltd | Agriculture & fishing | 2023 |
| Citistar Limited | Transport & logistics | 2009 |
| CJ and BJ Properties Limited | Real estate | 2024 |
| Cjbconsultancyservices Limited | Professional & scientific | 2024 |
| CJM Build Limited | Construction | 2025 |
| CJR Driving Hire Ltd | Transport & logistics | 2026 |
| Clananbe Limited | Real estate | 2020 |
| Clarks Building Services (Holdings) Limited | Professional & scientific | 2024 |
| Clarksons of Bath Limited | Construction | 1995 |
| Clark’S Building Services Limited | Wholesale & retail | 2016 |
| Clayton Care (South West) Ltd | Health & social care | 2022 |
| Clayton's Cottages Limited | Hospitality | 2021 |
| Claytons Restaurants Limited | Hospitality | 2017 |
| Client Funnels Ltd | Information & communication | 2022 |
| Clifton Brides Limited | Wholesale & retail | 2004 |
| Clje Ltd | Wholesale & retail | 2024 |
| Cloud Core Solutions Ltd | Information & communication | 2023 |
| Cloudxform Ltd | Information & communication | 2019 |
| CLP Property Investments Limited | Real estate | 2021 |
| CMH Collective Ltd | Households | 2026 |
| Coach House (Shepton Mallet) Management Company Limited | Households | 2001 |
| Coach House Developments (SW) Limited | Construction | 2024 |
| Coates Industrial Consulting Ltd | Administrative & support | 2020 |
| Cockmill Estate Limited | Real estate | 2014 |
| Coco Enterprises Limited | Real estate | 2019 |
| Code a Weld Group Ltd | Professional & scientific | 2013 |
| Code a Weld Holdings Limited | Other services | 2001 |
| Colbourne Builders Ltd. | Construction | 1998 |
| Coleford Youth and Community Hub CIC | Public administration | 2014 |
| Colette's Laundrette Limited | Other services | 2024 |
| Collision Consulting (UK) Limited | Professional & scientific | 2006 |
| Colour Wheel Art Class UK Limited | Education | 2015 |
| Colourwheel Bath Ltd | Education | 2024 |
| Columbia Properties Limited | Hospitality | 2015 |
| Combatfix Limited | Construction | 1987 |
| Compendia Limited | Information & communication | 2011 |
| Complete Property Holdings Ltd | Construction | 2017 |
| Completely Green Ltd | Wholesale & retail | 2017 |
| Concept Accountancy & Business Services Limited | Professional & scientific | 2009 |
| Concertare Limited | Professional & scientific | 2011 |
| Concorde Securities Ltd. | Administrative & support | 2023 |
| Consulting Support Services Ltd | Administrative & support | 2015 |
| Continu-Forms Profit Sharing Scheme Trustees Limited | Extraterritorial | 1999 |
| Continuity West Limited | Professional & scientific | 2011 |
| Contrado Consultancy Services Limited | Professional & scientific | 2010 |
| Convenience Products Limited | Manufacturing | 2012 |