| Carrime Ltd | Professional & scientific | 2021 |
| CBD Eco (London) Limited | Wholesale & retail | 2017 |
| CDT Catering & Hospitality Ltd | Hospitality | 2024 |
| Cedar Mews Management Limited | Real estate | 2007 |
| CEJ Media Limited | Professional & scientific | 2023 |
| Ceja Property Ltd | Real estate | 2018 |
| Challenger Electrical Ltd | Construction | 2020 |
| Charley MAC Hair Ltd | Other services | 2024 |
| Chauffeur Executives Oxford Limited | Transport & logistics | 2016 |
| Chimney Care Academy Limited | Administrative & support | 2026 |
| Chris Graham Limited | Professional & scientific | 2008 |
| Chrome Angel Solutions Limited | Information & communication | 2006 |
| Clarke Farming Ltd | Agriculture & fishing | 2022 |
| Clarke Farming Partnership Limited | Professional & scientific | 2015 |
| Clean on Limited | Administrative & support | 2024 |
| CLJ Home Limited | Professional & scientific | 2015 |
| Cluecation Ltd | Administrative & support | 2020 |
| Cmbe Limited | Construction | 2018 |
| Coir Consulting Limited | Professional & scientific | 2024 |
| Concert (CG1) Limited | Other services | 2002 |
| Concert (CG2) Limited | Professional & scientific | 2019 |
| Concert Consulting Group Limited | Professional & scientific | 2017 |
| Conectric Property Services Ltd | Construction | 2019 |
| Connecting to Excellence Ltd. | Professional & scientific | 2007 |
| Contourable Ltd | Wholesale & retail | 2019 |
| Cotswold Botanical Ltd | Agriculture & fishing | 2021 |
| Cotswold Cars Ltd | Transport & logistics | 2020 |
| Cotswold Metal Roofing Holdings Limited | Financial services | 2016 |
| Cotswold Metal Roofing Limited | Construction | 1995 |
| COX & Browning Limited | Professional & scientific | 2005 |
| Crowfield Properties Limited | Construction | 2004 |
| Crusoe Farm Co. Limited | Real estate | 1961 |
| Crusoe Farm Property Development Co Ltd | Real estate | 2018 |
| Crystal Contracts Limited | Construction | 2020 |
| CTT Interim Limited | Professional & scientific | 2020 |
| Curoptica Practice Consultancy Limited | Professional & scientific | 2025 |
| Dantzig (Woodstock) Limited | Other services | 2021 |
| Dashe Aviation Ltd | Transport & logistics | 2017 |
| Day Electrical MB Limited | Construction | 2016 |
| DE Property Limited | Real estate | 2025 |
| Dermatology Education Partnership Limited | Education | 2015 |
| Design by US Ltd | Professional & scientific | 2021 |
| Dinky Artist Limited | Wholesale & retail | 2018 |
| Divine OX Ltd | Professional & scientific | 2023 |
| DO - Work Maintenance Limited | Real estate | 1993 |
| Doodle & Noodle Ltd | Hospitality | 2023 |
| Dotcom Finance Limited | Professional & scientific | 2001 |
| Doug Holloway Projects Ltd | Construction | 2010 |
| DR Katie Hurst Ltd | Health & social care | 2025 |
| Dragonfly Developers Limited | Real estate | 2025 |
| Dread Scott Limited | Arts & recreation | 2018 |
| Driven International Ltd. | Construction | 2013 |
| Drone Roofing Surveys Limited | Professional & scientific | 2017 |
| DRP Legal Limited | Professional & scientific | 2016 |
| Duckers Style Limited | Manufacturing | 2021 |
| Early Advisory Ltd | Professional & scientific | 2017 |
| Ec-Interactive Limited | Information & communication | 2004 |
| Edison's Construction Ltd | Construction | 2024 |
| EDL Property Holdings Limited | Administrative & support | 2011 |
| Edreach Ltd | Education | 2024 |
| Electrical Living Limited | Construction | 2019 |
| Elstow Holdings Limited | Real estate | 2025 |
| Emerald Hill Studio Limited | Professional & scientific | 2018 |
| English Wine Academy Ltd | Professional & scientific | 2024 |
| Enstone Uplands and District Conservation Trust | Other services | 2006 |
| Eporedia Business Services Limited | Real estate | 2007 |
| Eporedia Security Ltd | Information & communication | 2016 |
| Equinox Cubed Limited | Financial services | 2016 |
| Evidence & Impact Oxford Ltd | Professional & scientific | 2021 |
| Eynsham Barbers Limited | Other services | 2016 |
| Fama E-Commerce Limited | Wholesale & retail | 2024 |
| FAR Communications Ltd | Professional & scientific | 2019 |
| Felicitatem Capital | Financial services | 2018 |
| Fine Aviation Solutions Limited | Other services | 2022 |
| Fintechpath UK Ltd | Information & communication | 2019 |
| First Turn Development Consulting Limited | Professional & scientific | 2023 |
| Fisher Harrison Limited | Arts & recreation | 2019 |
| Fitbeing Ltd | Arts & recreation | 2013 |
| Fitter, Healthier, Happier Limited | Health & social care | 2013 |
| Flex Information Technology Limited | Information & communication | 1998 |
| Flex IT Group Limited | Financial services | 2021 |
| Flex-Itsolutions Limited | Extraterritorial | 2021 |
| Fodges Ltd | Wholesale & retail | 2024 |
| Forest Ford Ltd | Education | 2026 |
| Form Design Workshop Ltd | Professional & scientific | 2009 |
| Four Eight Software Limited | Information & communication | 2020 |
| Frame FX Ltd | Information & communication | 2015 |
| Freelance Pilot Services Limited | Other services | 2012 |
| FT2 Inventories Ltd | Real estate | 2014 |
| G C Tiling Limited | Construction | 2015 |
| G Wood Plumbing & Heating Ltd | Construction | 2016 |
| G20 GAS Solutions Ltd | Extraterritorial | 2019 |
| Gadiwalla Ltd | Transport & logistics | 2021 |
| Gateway ID Africa Limited | Information & communication | 2019 |
| GB Personal Training Limited | Health & social care | 2009 |
| George & Dragon (Oxford) Ltd | Hospitality | 2026 |
| George Faulkner Consulting Ltd | Professional & scientific | 2023 |
| Geosym Construction Ltd | Construction | 2022 |
| Global Branded Residences Ltd | Professional & scientific | 2023 |
| Global Engineering Projects Ltd | Professional & scientific | 2012 |