| CG Auto Solutions Ltd | Wholesale & retail | 2025 |
| Checkmate Flexible Engineering Holdings Limited | Financial services | 2020 |
| Checkmate Flexible Engineering Limited | Manufacturing | 2006 |
| Cheniti Limited | Professional & scientific | 2013 |
| Cherry Fusion Limited | Professional & scientific | 2011 |
| Cherry Pilates Limited | Arts & recreation | 2026 |
| Children of the Water Ltd | Education | 2021 |
| Chilledweb Ltd | Information & communication | 2010 |
| Chris Norris Engineering Limited | Professional & scientific | 2022 |
| Church Lane (Melksham) Management Company Limited | Households | 2001 |
| Cjkc Ltd | Wholesale & retail | 2023 |
| CJW Roofing Specialist Ltd | Construction | 2026 |
| CJW Scaffolding (SW) Ltd | Construction | 2024 |
| CK Car Wash Valeting Limited | Administrative & support | 2022 |
| Clarity Bristol Ltd | Health & social care | 2012 |
| Clarkwood MOT Limited | Wholesale & retail | 2026 |
| Classic Motors Limited | Wholesale & retail | 2005 |
| Clayton Hall Ltd | Real estate | 2026 |
| Clean by Aria Ltd | Administrative & support | 2025 |
| Cleeve Consulting Limited | Professional & scientific | 2023 |
| Close Support Ltd | Professional & scientific | 2023 |
| CNP Group Ltd. | Wholesale & retail | 2013 |
| Cochran Piping Solutions Ltd | Extraterritorial | 2013 |
| Coffee Odyssey Ltd | Wholesale & retail | 2022 |
| Colder Refrigeration Ltd | Manufacturing | 2023 |
| Colder Refrigeration Services (SW) Limited | Other services | 2009 |
| Colebrook Bosson & Saunders (Products) Limited | Manufacturing | 1990 |
| Colin Harrison Design Limited | Administrative & support | 2006 |
| Collins and Hayes Furniture Limited | Manufacturing | 2017 |
| Coln Solutions Limited | Information & communication | 2009 |
| Colour Idea Ltd | Wholesale & retail | 2011 |
| Colour Works (Bath) Limited | Construction | 2016 |
| Commercial Debt Recovery Experts Ltd | Administrative & support | 2019 |
| Concordia Limited | Professional & scientific | 2004 |
| Conigre Mews Management Company Limited | Households | 2004 |
| Connectivitas Limited | Information & communication | 2023 |
| Consortium Ltd | Administrative & support | 2022 |
| Continental Business Agents Ltd | Administrative & support | 2010 |
| Cooke Automotive Ltd | Wholesale & retail | 1999 |
| Coopers Commercial Space Limited | Real estate | 2025 |
| Copper Beech Court (Melksham) Management Company Limited | Hospitality | 1986 |
| Core Building and Electrical Services Limited | Construction | 2018 |
| Corella Ltd | Construction | 2018 |
| Corella Maintenance Limited | Construction | 2025 |
| Corking Project Limited | Information & communication | 2006 |
| Cotswold Classic Car Hire Limited | Administrative & support | 2008 |
| Country Renovations Ltd | Construction | 2024 |
| Courtyard Cross Keys Ltd | Real estate | 2025 |
| CPO Design Ltd | Information & communication | 2015 |
| Craft Bazaar Ltd | Wholesale & retail | 2018 |
| Craybourne Ltd | Real estate | 2025 |
| Creative Works ( SW ) Ltd | Professional & scientific | 2021 |
| Cristina Garma Ltd | Health & social care | 2023 |
| Crossfit Civitas Limited | Arts & recreation | 2018 |
| Croston Consulting Limited | Information & communication | 2021 |
| Croudace Financial Services Ltd | Professional & scientific | 2022 |
| Crown House RTM Company Limited | Households | 2016 |
| CS Holdings Limited | Other services | 2018 |
| CS Melksham Limited | Hospitality | 2025 |
| Curcle Ltd | Information & communication | 2026 |
| Custom Van Conversions Limited | Wholesale & retail | 2025 |
| CXT Events Ltd | Administrative & support | 2025 |
| D & M Gompels Limited | Wholesale & retail | 2018 |
| D Gaskin Limited | Professional & scientific | 2020 |
| D Pearce Haulage Limited | Transport & logistics | 2013 |
| D V Brown Consultancy Ltd | Professional & scientific | 2020 |
| D6 Property Ltd | Real estate | 2024 |
| DA Archive Solutions Limited | Other services | 2004 |
| Daily Innovation News Ltd | Information & communication | 2025 |
| Dalpio Services Ltd | Construction | 2023 |
| Danecroft Consultants Limited | Financial services | 1999 |
| Daniel Rymer Hair Limited | Other services | 2018 |
| Dave Wicks Entertainments Limited | Administrative & support | 2003 |
| David Charman Removals Ltd | Other services | 2019 |
| Davies and Davies South West Limited | Real estate | 2018 |
| Daviesunlimited Ltd | Real estate | 2024 |
| DE Maunder Properties Ltd | Real estate | 2025 |
| Deep Space Development Ltd | Professional & scientific | 2023 |
| Delicata Ltd | Construction | 2025 |
| Delves White Training Ltd | Education | 2019 |
| Dempsey Inns Limited | Hospitality | 2025 |
| Dental Hygiene Ltd | Health & social care | 2015 |
| Derwent Upholstery Limited | Extraterritorial | 1981 |
| Devizes Steel Supplies Enterprises Ltd | Professional & scientific | 2010 |
| Devizes Steel Supplies Limited | Manufacturing | 2002 |
| Devlin Bridal Ltd | Wholesale & retail | 2018 |
| DHF Engineering Limited | Manufacturing | 1999 |
| Dimensional Alchemy Limited | Information & communication | 2020 |
| Dino Consulting Services Limited | Professional & scientific | 2023 |
| Dino Properties UK Limited | Real estate | 2024 |
| Disruptors Cyber Ltd | Information & communication | 2025 |
| DNL Property Services Limited | Construction | 2013 |
| Douve Holdings Limited | Real estate | 2021 |
| Dovetail Installers Ltd | Construction | 2015 |
| Downland Produce Wiltshire Ltd | Manufacturing | 2018 |
| DR Kathryn Hogg Aesthetics Ltd | Health & social care | 2022 |
| Draychem Ltd | Administrative & support | 2000 |
| Drone Wash Ltd | Administrative & support | 2026 |
| DT Accountancy Services Limited | Professional & scientific | 2010 |
| Dunn Developments Limited | Real estate | 2011 |