| Coldstone Barns Management Company Limited | Households | 2001 |
| Coldstone Consulting Limited | Professional & scientific | 2014 |
| Colledge Architects Ltd | Professional & scientific | 2023 |
| COLLINS2 Ltd | Real estate | 2026 |
| Colour & Finish Solutions Ltd | Construction | 2017 |
| Colourbox School Photography Ltd | Professional & scientific | 2026 |
| Colt Property Holdings Ltd | Real estate | 2024 |
| Colwood Business Units Ltd. | Real estate | 2003 |
| Colwood Industrial Buildings Co | | 1981 |
| Communication for Development Network Ltd | Administrative & support | 2011 |
| Communications for Development Ltd. | Administrative & support | 2005 |
| Community Relations Matters Limited | Professional & scientific | 2016 |
| Competition Car Sales Ltd | Wholesale & retail | 2021 |
| Condicus Limited | Construction | 2014 |
| Conker Statistics Ltd | Information & communication | 2007 |
| Control Logic Oxford Limited | Information & communication | 2018 |
| Cooking Apple Limited | Manufacturing | 2009 |
| Cookschool Futures CIC | Education | 2026 |
| Coombefield Forestry Limited | Agriculture & fishing | 2015 |
| Copthall Leasing Company | | 1978 |
| Corbetts Electrical Limited | Wholesale & retail | 2013 |
| Cornbury Estates Company Limited | Professional & scientific | 2006 |
| Cornbury Maintenance Company Limited | Professional & scientific | 2006 |
| Corsa Group Ltd | Professional & scientific | 2019 |
| Cotshill Management Company Limited | Households | 1995 |
| Cotswold Baking Limited | Hospitality | 2011 |
| Cotswold Bookkeeping and Accounts Limited | Professional & scientific | 2003 |
| Cotswold Cabs Ltd | Transport & logistics | 2026 |
| Cotswold Canine Club Ltd | Other services | 2024 |
| Cotswold Carpets Limited | Wholesale & retail | 2004 |
| Cotswold Carriers Removals Limited | Transport & logistics | 2003 |
| Cotswold Coaching Clinic Ltd | Other services | 2019 |
| Cotswold Colleague Limited | Administrative & support | 2016 |
| Cotswold Cool Trailers Limited | Administrative & support | 2023 |
| Cotswold Crayfish Company Limited | Manufacturing | 2021 |
| Cotswold Cycles (Holdings) Limited | Financial services | 2021 |
| Cotswold Cycles Limited | Wholesale & retail | 2011 |
| Cotswold Decorating Limited | Construction | 2015 |
| Cotswold Design Services Limited | Administrative & support | 2015 |
| Cotswold Drinks Co Limited | Wholesale & retail | 2019 |
| Cotswold Estate Management Ltd | Real estate | 2025 |
| Cotswold Financial Planning Ltd | Financial services | 2008 |
| Cotswold Flooring Limited | Wholesale & retail | 2004 |
| Cotswold Fudge Co. Limited | Extraterritorial | 2008 |
| Cotswold Furniture Hire Ltd | Administrative & support | 2025 |
| Cotswold Glass and Crafts Ltd | Wholesale & retail | 2020 |
| Cotswold Haus Limited | Real estate | 2026 |
| Cotswold Heat Pumps Ltd | Construction | 2026 |
| Cotswold Hipster Limited | Manufacturing | 2025 |
| Cotswold Home Manager Limited | Administrative & support | 2022 |
| Cotswold Housekeeping Ltd | Extraterritorial | 2024 |
| Cotswold Lighting Specialists Ltd | Construction | 2023 |
| Cotswold Merrymouth Ltd | Hospitality | 2020 |
| Cotswold Physio Ltd | Other services | 2023 |
| Cotswold Pizza Company Limited | Hospitality | 2017 |
| Cotswold Roofing Limited | Construction | 2007 |
| Cotswold Rugby Academy Limited | Arts & recreation | 2023 |
| Cotswold Stone & Wood Tiles Limited | Construction | 2018 |
| Cotswold Stone Creations Ltd | Manufacturing | 2014 |
| Cotswold Stone Sales Limited | Extraterritorial | 1993 |
| Cotswold Stoves & Chimneys Ltd | Construction | 2017 |
| Cotswold View Holiday Cottage Ltd | Hospitality | 2023 |
| Cotswold Waste Limited | Water & waste | 2024 |
| Cotswold Wedding Veils Ltd | Wholesale & retail | 2019 |
| Cotswolds Advanced Practitioners Ltd | Health & social care | 2026 |
| Cotswolds Cottage Gems Limited | Hospitality | 2025 |
| Cotswolds Fungi Ltd | Agriculture & fishing | 2023 |
| Cotswolds House Ltd | Real estate | 2024 |
| Cotswolds Lawn & Order Ltd | Administrative & support | 2023 |
| Cotswork Limited | Administrative & support | 2023 |
| Counterspike Limited | Manufacturing | 2024 |
| Country Creatures Ltd | Professional & scientific | 2013 |
| Country Creatures Management LLP | | 2018 |
| Countrywide Storage Bromsgrove Limited | Real estate | 2021 |
| Countrywide Storage Chipping Camden Limited | Real estate | 2023 |
| Countrywide Storage Chipping Norton Limited | Real estate | 2019 |
| County Commercial Properties Limited | Construction | 1991 |
| County Pumps Limited | Manufacturing | 1977 |
| Coxmoor Publishing Limited | Information & communication | 1996 |
| CP Mechanical Ltd | Construction | 2025 |
| CP Shaw Limited | Professional & scientific | 2013 |
| Cradle of English Ltd | Manufacturing | 2019 |
| Creation Property Network C.I.C. | Real estate | 2017 |
| Creeton Quarry Limited | Extraterritorial | 2006 |
| Crief Consultancy Ltd | Professional & scientific | 2023 |
| Crossways (Enstone) Management Company Limited | Households | 2009 |
| Crs.Vet Ltd | Professional & scientific | 2015 |
| Cssl NO. 2 Limited | Extraterritorial | 2021 |
| CTG Construction Management Ltd | Construction | 2015 |
| Cubyria Games Limited | Manufacturing | 2026 |
| Culham Farming Limited | Agriculture & fishing | 2023 |
| Culham Holdings Limited | Financial services | 2024 |
| Cumbrian Homes Management Limited | Real estate | 2024 |
| Custom Kind Ltd | Professional & scientific | 2025 |
| Cutting Edge Engineering Ltd | Manufacturing | 2024 |
| Cyclone Ducting & Extraction Services Limited | Administrative & support | 2006 |
| D S H Carpentry & Design Ltd. | Arts & recreation | 2003 |
| D'Avila Illustration Agency Ltd | Other services | 2019 |
| D.H. Pearman & Sons (Over Norton) Limited | Agriculture & fishing | 1976 |
| Dace Construction Ltd | Construction | 2024 |