| Butlers Domestic & Commercial Cleaning Ltd | Administrative & support | 2023 |
| Butlers Drive RTM Company Ltd | Real estate | 2026 |
| Buttercross Company Limited(The) | Professional & scientific | 1987 |
| C & C Carpentry (Witney) Limited | Construction | 2008 |
| C D Electrical Contractors Limited | Construction | 2004 |
| C D H Associates Limited | Administrative & support | 2007 |
| C JEM Properties Ltd | Real estate | 2023 |
| C S Bindery Solutions Ltd | Real estate | 2012 |
| C.J.B. Building and Maintenance Ltd | Construction | 2025 |
| C3 Peasenhall Limited | Construction | 2025 |
| Camilla Wehmeyer Management Limited | Arts & recreation | 2020 |
| Carbon Print Management Solutions Limited | Manufacturing | 2002 |
| Carol Kerven Odessa Centre Limited | Professional & scientific | 2003 |
| Carterton Community Centre | Arts & recreation | 2008 |
| Carterton Food Angels CIC | Hospitality | 2025 |
| Carterton Football Club C.I.C. | Arts & recreation | 2018 |
| Carterton Gymnastic Club CIC | Arts & recreation | 2018 |
| Carterton Hair Salon Limited | Other services | 2018 |
| Carterton Heating and Plumbing Services Limited | Construction | 2007 |
| Carterton Homestore Limited | Administrative & support | 2015 |
| Carterton Kebab Grill Ltd | Hospitality | 2024 |
| Carterton Nails and Spa Ltd | Other services | 2024 |
| Carterton Plant and Landscaping Limited | Construction | 2019 |
| Castle Eaton Hospitality Ltd | Hospitality | 2023 |
| Caviland Limited | Extraterritorial | 1996 |
| CCR Investments Ltd | Real estate | 2017 |
| CDU Trans Limited | Transport & logistics | 2017 |
| Central Employment (Bracknell) Limited | Real estate | 1973 |
| Central Heating Maintenance (Oxfordshire) Ltd | Construction | 2010 |
| Chalet K Limited | Administrative & support | 2019 |
| Chaplais Kitchen Limited | Hospitality | 2018 |
| Chaplais Limited | Wholesale & retail | 2004 |
| Charlie's Taxis Limited | Transport & logistics | 2016 |
| Charlie's Travel Limited | Transport & logistics | 2003 |
| Chelworth (Management) Limited | Professional & scientific | 2003 |
| Cherry Lane Equestrian Limited | Other services | 2017 |
| Chipton Consulting Limited | Information & communication | 2016 |
| Chris Horne Bia/Amhp Limited | Health & social care | 2016 |
| Christians of England Fellowship Limited | Other services | 2025 |
| Cinemould Ltd | Arts & recreation | 2021 |
| Clipperz Barber Limited | Other services | 2021 |
| CLK Fire & Safety Compliance Limited | Public administration | 2016 |
| Clove and Calm Limited | Wholesale & retail | 2026 |
| Coln River Construction Limited | Construction | 2016 |
| Combined Logical Solutions Ltd. | Manufacturing | 2001 |
| Companion Care (Witney) Limited | Professional & scientific | 2000 |
| Complete Presentation Limited | Administrative & support | 2006 |
| Consult Saville's Ltd | Professional & scientific | 2022 |
| Coppercraft Engineering Ltd | Construction | 2022 |
| Cordelia Limited | Health & social care | 2022 |
| Corpro Limited | Professional & scientific | 2019 |
| Cortal Limited | Wholesale & retail | 2025 |
| Cotswold Engineering & Design Ltd | Professional & scientific | 2022 |
| Cotswold Fire Door Company Ltd | Construction | 2023 |
| Cotswold Particles Ltd | Wholesale & retail | 2024 |
| Cotswold Property Investors Ltd | Construction | 2023 |
| Cotswold Residential Design Ltd | Professional & scientific | 2007 |
| Cotswold Screeds Ltd | Construction | 2025 |
| Cotswoldprecision Ltd | Construction | 2026 |
| Courtney Jones Financial Services Ltd | Financial services | 2024 |
| Craft & Curious Limited | Manufacturing | 2019 |
| Creavation Ltd | Professional & scientific | 2025 |
| Creme DE LA Creme Human Resources Ltd | Administrative & support | 2013 |
| Crescent Accountancy Solutions Limited | Professional & scientific | 1998 |
| Crown Assets and Management Limited | Financial services | 2024 |
| Crown Construction and Maintenance Limited | Construction | 2024 |
| Crown Signature Homes Ltd | Construction | 2021 |
| CS Cleaners Cat Suzet Ltd | Manufacturing | 2012 |
| CS Motors Limited | Wholesale & retail | 2003 |
| CSH Ramnoth Road Ltd | Construction | 2024 |
| Cuttack Ltd | Professional & scientific | 2026 |
| D Ritchings Ltd | Hospitality | 2025 |
| DAB Legal Services Limited | Administrative & support | 2005 |
| Dandore Software Ltd | Information & communication | 2026 |
| Dangerous Goods Solutions Europe Ltd | Professional & scientific | 2025 |
| Daniels Independent Gardening Limited | Administrative & support | 2016 |
| Darren Watt Landscaping Ltd | Administrative & support | 2022 |
| DC Diagnostics Ltd | Wholesale & retail | 2025 |
| DCB Utilities Ltd | Construction | 2025 |
| Delight Pizza Limited | Hospitality | 2022 |
| Dementia Active Community Interest Company | Transport & logistics | 2019 |
| Dementia Active Property Ltd | Real estate | 2021 |
| DG Development Solutions Ltd | Information & communication | 2019 |
| Diesel Bros Ltd | Extraterritorial | 2023 |
| DMB Project Management Limited | Professional & scientific | 2005 |
| Dream Wild Adventures Ltd | Administrative & support | 2022 |
| DS & SS Property Limited | Real estate | 2018 |
| Dyne Road Limited | Real estate | 2011 |
| Dynotech RS Ltd | Manufacturing | 2016 |
| E-Sphere Limited | Information & communication | 2007 |
| East Burford Ltd | Professional & scientific | 2025 |
| Ecopack Solutions Ltd | Professional & scientific | 2019 |
| EF Dressage Sales Limited | Administrative & support | 2007 |
| Ella RAE Moulds Vinyls Ltd | Manufacturing | 2018 |
| Elmhurst Aesthetics Clinic Ltd | Other services | 2025 |
| Elre Limited | Professional & scientific | 2024 |
| Emile Faurie Limited | Arts & recreation | 1994 |
| Empire Gates Ltd | Construction | 2018 |
| Equality Management Ltd | Professional & scientific | 2021 |
| Equinops Ltd | Professional & scientific | 2026 |