| Bunton Catering Ltd | Wholesale & retail | 2022 |
| Bunton Property Ltd | Financial services | 2020 |
| Burlacu Transport Limited | Transport & logistics | 2017 |
| Business Advice & Support LLP | | 2019 |
| Business Resolved Limited | Professional & scientific | 2004 |
| Busy BEE Houses Ltd | Real estate | 2021 |
| Butfield Breach Ltd | Real estate | 2004 |
| BW Signs Limited | Administrative & support | 2013 |
| Bytebarn Innovations Ltd | Information & communication | 2024 |
| C & P Real Homes Ltd. | Administrative & support | 2017 |
| C Brittain Electrical Services Ltd | Construction | 2018 |
| C J Steel Electrical Services Limited | Construction | 2008 |
| C.D Substructures Ltd | Construction | 2026 |
| C4 Construction Limited | Construction | 2019 |
| Calcote Ltd | Real estate | 2022 |
| Calmore Management Limited | Professional & scientific | 2002 |
| Calne Auto Valeting Ltd | Administrative & support | 2025 |
| Calne Brew Co. Ltd | Manufacturing | 2025 |
| Calne Budget Taxi Ltd | Transport & logistics | 2023 |
| Calne Care Limited | Health & social care | 2025 |
| Calne Community Transport | Transport & logistics | 1991 |
| Calne Engineering Limited | Manufacturing | 1978 |
| Calne Fusion Ltd | Hospitality | 2024 |
| Calne Kebab Limited | Hospitality | 2026 |
| Calne Motorcycles Wilts Ltd | Wholesale & retail | 2025 |
| Calne Motors Ltd | Wholesale & retail | 2025 |
| Calne Pet Supplies Ltd | Wholesale & retail | 2024 |
| Calne Recreation Club Limited | Arts & recreation | 2002 |
| Calne Save on Tyres Ltd | Wholesale & retail | 2020 |
| Calne Springs C.I.C. | Other services | 2012 |
| Calne Tandoori Limited | Hospitality | 2017 |
| Calne Tennis Club Limited | Arts & recreation | 2017 |
| Calne Top Car Sales Limited | Wholesale & retail | 2024 |
| Calne Top Hand Car Wash Limited | Other services | 2019 |
| Calne Town FC Ltd | Arts & recreation | 2009 |
| Calne Trading Limited | Wholesale & retail | 2025 |
| Calne Veterinary Centre Limited | Professional & scientific | 2012 |
| Cambridge Deli Company Ltd | Wholesale & retail | 2022 |
| Campbell Professional Recruitment Ltd | Administrative & support | 2021 |
| Caring Brothers Foundation | Public administration | 2014 |
| Carna Solutions Limited | Professional & scientific | 2013 |
| Carter FRY Ltd | Professional & scientific | 2024 |
| Cartrefol Ltd | Real estate | 2021 |
| Casa Roma Ltd | Hospitality | 2026 |
| Cassiopeia Group Ltd | Financial services | 2025 |
| Castlebawn Investment (UK) Ltd | Real estate | 2020 |
| Catol Ltd | Information & communication | 2018 |
| CC Squared Consulting Limited | Professional & scientific | 2010 |
| CDL Property Investments Ltd | Real estate | 2023 |
| CDR Insurance Services Limited | Financial services | 2026 |
| Celtic Cribbs Ltd | Financial services | 2024 |
| Changework HR Services Limited | Professional & scientific | 2007 |
| Charles Finch Associates Limited | Professional & scientific | 2020 |
| Charwhit Property Group Ltd | Financial services | 2022 |
| Charwhit Property Investments Ltd | Real estate | 2022 |
| Charwhit Property Management Ltd | Real estate | 2022 |
| Checkmate Software Ltd | Information & communication | 2024 |
| Cherhill Food Ltd | Hospitality | 2025 |
| Cherry Tree Court (Calne) Management Limited | Professional & scientific | 1990 |
| Cherrys Enterprise Ltd | Wholesale & retail | 2024 |
| Choulden Holdings Limited | Professional & scientific | 2000 |
| Chrested Holdings Ltd | Financial services | 2025 |
| Church Street Calne Management Company Limited | Real estate | 2015 |
| Circus Piddly Limited | Arts & recreation | 2025 |
| City Alliance Marketing Consulting Ltd | Professional & scientific | 2011 |
| CJA Global Co., Ltd | Professional & scientific | 2024 |
| CK Abode Ltd | Real estate | 2018 |
| CL Woodworth Ltd | Wholesale & retail | 2016 |
| Clarity Bookkeeping & Accounts Ltd | Professional & scientific | 2019 |
| Classic Blooms Limited | Wholesale & retail | 2020 |
| Claviga Consulting Ltd | Professional & scientific | 2026 |
| Clean Calne Ltd | Administrative & support | 2024 |
| Clean Geek Ltd | Wholesale & retail | 2024 |
| Clyfar Ltd | Information & communication | 2014 |
| Collis Street Limited | Real estate | 2022 |
| Compton Bassett (NO1) Residents Company Limited | Households | 2002 |
| Concept 2 Creation Ltd | Administrative & support | 2016 |
| Concept Drawing and Design Architects Ltd | Professional & scientific | 2014 |
| Continental Security UK Limited | Administrative & support | 2010 |
| Coombes Carpentry Limited | Construction | 2015 |
| Cornhatch Property Ltd | Real estate | 2023 |
| Cornwall Caravans Ltd | Wholesale & retail | 2017 |
| Corrie Limited | Administrative & support | 1997 |
| Corsham Therapy Rooms Ltd | Real estate | 2026 |
| Corston Properties Limited | Real estate | 2018 |
| Cotham Property Solutions Ltd | Hospitality | 2021 |
| Cotswold Developments and Restorations Limited | Construction | 2017 |
| County Stairlifts Limited | Extraterritorial | 2024 |
| COX Precast Flooring Ltd | Construction | 2015 |
| Cradle Overseas Pensions Limited | Financial services | 2010 |
| Creatively Installed Ltd | Construction | 2012 |
| Crescent Design and Build Ltd | Construction | 2016 |
| Crew Developments Ltd | Construction | 2025 |
| Crew Holdings (Cornwall) Ltd | Financial services | 2025 |
| Crew Investments Ltd | Real estate | 2024 |
| Crooks Peak Limited | Information & communication | 2021 |
| Cross Country Tyres Limited | Administrative & support | 2005 |
| Crossfit Calne Ltd | Arts & recreation | 2024 |
| Crosswind Aircraft Management Ltd | Transport & logistics | 2022 |
| Crush Wines Holdings Ltd | Financial services | 2023 |