| Ceylon Services UK Ltd | Wholesale & retail | 2026 |
| Ceylon Suppliers Ltd | Wholesale & retail | 2023 |
| CFO First Ltd | Professional & scientific | 2025 |
| CGA Nielsen (Global) Limited | Professional & scientific | 2014 |
| CGA Strategy Limited | Professional & scientific | 1992 |
| CGR Remo Limited | Health & social care | 2024 |
| CH Race Engineering Ltd | Professional & scientific | 2014 |
| CHA London Ltd | Administrative & support | 2023 |
| Chadshunt Special Projects Limited | Information & communication | 2015 |
| Chah AB Ltd | Hospitality | 2022 |
| Chain House Ltd | Real estate | 2022 |
| Chalbourne Ltd | Real estate | 2012 |
| Chalgrove Artisan Distillery Limited | Manufacturing | 2017 |
| Chalgrove Pharmacy Ltd | Wholesale & retail | 2000 |
| Chalkstar Films Ltd | Information & communication | 2012 |
| Chama Cuisine Limited | Hospitality | 2024 |
| Chamberlain Evans Ltd | Real estate | 2010 |
| Chamlock Ltd | Professional & scientific | 2024 |
| Chandler Publishing Limited | Information & communication | 2021 |
| CHANGE360 Limited | Extraterritorial | 2006 |
| Changing Lens Ltd | Information & communication | 2020 |
| Channel Property Limited | Real estate | 2019 |
| Channel Solutions Resource Limited | Information & communication | 2013 |
| Chapter One OX Ltd | Hospitality | 2025 |
| Chargestack Ltd | Information & communication | 2026 |
| Chargeworks Limited | Professional & scientific | 2022 |
| Charismatic Entertainment Limited | Information & communication | 2023 |
| Charity Football League Limited | Arts & recreation | 2012 |
| Charity of Thomas Dawson | Education | 2023 |
| Charlbury Building Company Limited | Construction | 1977 |
| Charlbury Capital Limited | Financial services | 2026 |
| Charlbury House Developments Limited | Construction | 2023 |
| Charlbury House Estate Limited | Administrative & support | 2012 |
| Charlbury Place Management Company Limited | Real estate | 2015 |
| Charles and Lois Ventures Limited | Wholesale & retail | 2024 |
| Charlie Forster Ltd | Arts & recreation | 2025 |
| Charlie Foxtrot EMT Limited | Health & social care | 2024 |
| Charlie GEE Ltd | Hospitality | 2024 |
| Charlotte Al-Qadi Publishing Consultancy Limited | Information & communication | 2019 |
| Charm-Cafe Ltd | Manufacturing | 2022 |
| Charminster Jessopp Limited | Professional & scientific | 2015 |
| Charsooh UK Limited | Health & social care | 2018 |
| Chartercruise Limited | Transport & logistics | 2004 |
| Chase Developments (Oxford) Ltd | Construction | 2015 |
| CHASE7 Ltd | Wholesale & retail | 2024 |
| CHASE88 Limited | Professional & scientific | 2008 |
| Chaska House Ltd | Hospitality | 2023 |
| Chater Limited | Professional & scientific | 2012 |
| Chattabox International Ltd | Wholesale & retail | 2013 |
| Chaudhury Medical Services Ltd | Health & social care | 2024 |
| Chauffeur Kings Ltd | Transport & logistics | 2022 |
| Chauley Holdings Ltd | Financial services | 2026 |
| Checker Hall Company Limited | Real estate | 2020 |
| Chefchef Limited | Hospitality | 2024 |
| Chefcuisinier Ltd | Hospitality | 2025 |
| Chelibricks Limited | Wholesale & retail | 2022 |
| Chelsea Business School Ltd | Education | 2021 |
| Chelsea Education Consultancy Ltd | Professional & scientific | 2018 |
| Chelsea Vale Independent Leasing Limited | Financial services | 1998 |
| Chelwood House Freehold Company Limited | Real estate | 2005 |
| Chemistry Team Ltd | Professional & scientific | 2024 |
| Chen Group Limited | Financial services | 2024 |
| Cheneration Limited | Administrative & support | 2013 |
| Chereau (UK) Limited | Administrative & support | 1999 |
| Cherith Summers Limited | Arts & recreation | 2025 |
| Cherrillphoto Ltd | Professional & scientific | 2021 |
| Cherry Tree Nursery (Oxford) Ltd | Education | 2012 |
| Cherwell Boathouse Limited | Hospitality | 2018 |
| Cherwell College Oxford Limited | Education | 2012 |
| Cherwell Design and Build Limited | Construction | 2015 |
| Cherwell Property Holding Limited | Real estate | 2017 |
| Cherwell Publishing Services Limited | Information & communication | 1998 |
| Cherwell Removals and Storage Ltd | Transport & logistics | 2025 |
| Cherwell Roofing Limited | Construction | 2003 |
| Cherwell Valley Roofing Ltd | Construction | 2022 |
| Chesham Estates (Development Management Plymouth) Limited | Construction | 2022 |
| Chesham Estates (Development Management) Limited | Construction | 2011 |
| Chessmy Ltd | Professional & scientific | 2025 |
| Chesspick Ltd | Information & communication | 2025 |
| Chester Flooring Ltd | Construction | 2024 |
| Chester Hopkins International Limited | Arts & recreation | 1983 |
| Chez Gaston Ltd | Real estate | 2002 |
| CHI CHI Oxford Ltd | Other services | 2025 |
| Chibby Ltd | Real estate | 2023 |
| Chicadex Trendy Ltd | Manufacturing | 2019 |
| Chichele Property Company (ASC) Limited | Mining & quarrying | 1996 |
| Chick Productions Ltd | Information & communication | 2023 |
| Chilcomb Management Services Limited | Professional & scientific | 2011 |
| Child and Parent Support Caps Limited | Health & social care | 2008 |
| Child Health Ventures Ltd | Financial services | 2024 |
| Child Psychiatry Oxford Ltd | Health & social care | 2025 |
| Chillies Spice Oxford Ltd | Hospitality | 2017 |
| Chilmark Limited | Extraterritorial | 2007 |
| Chilswell Investments Limited | Real estate | 2015 |
| Chiltern Directories Ltd | Information & communication | 2011 |
| Chilworth Timber Company Ltd | Wholesale & retail | 2014 |
| China Street Food Ltd | Hospitality | 2019 |
| Chingaari Ltd | Hospitality | 2026 |
| Chipping Norton Properties Ltd | Real estate | 2023 |
| Chiralabs Limited | Professional & scientific | 2002 |