| Cavish Civil Engineering and Groundwork Ltd | Construction | 2021 |
| Cavish Group Limited | Financial services | 2021 |
| CCT Learning | Education | 2012 |
| Cedar Group Holdings Limited | Financial services | 2023 |
| Celi Socials Limited | Professional & scientific | 2024 |
| Cerebrum Properties Ltd | Real estate | 2018 |
| Chapel Court Freehold Limited | Households | 2022 |
| Chapel Court Owners RTM Company Limited | Households | 2021 |
| Chappell Gardens Ltd | Administrative & support | 2010 |
| Charismatic Marketing Limited | Professional & scientific | 2003 |
| Charlie Fisher Holdings Ltd | Transport & logistics | 2025 |
| Charlton Piling & Foundations Limited | Construction | 2013 |
| Chase Heating & Plumbing Limited | Construction | 2018 |
| Chaseborough Property Ltd | Real estate | 2026 |
| Cheeky Threads Ltd | Wholesale & retail | 2025 |
| Cheerleader Productions Limited | Wholesale & retail | 2006 |
| Cheltenham & Gloucester Scaffolding Assets Limited | Construction | 2013 |
| Cheltenham & Gloucester Scaffolding Group Limited | Administrative & support | 2023 |
| Cheltenham & Gloucester Scaffolding Limited | Construction | 2012 |
| Cheltenham Country Clothing Ltd | Wholesale & retail | 2023 |
| Cheltenham Electricks Ltd | Construction | 2025 |
| Cheltenham Fireworks Ltd | Wholesale & retail | 2020 |
| Cheltenham Specialist Surgery Limited | Health & social care | 2019 |
| Cheltenhambuildsw Ltd | Construction | 2023 |
| Chequers Road Property Management Company Limited | Real estate | 2006 |
| Cherry Orchard Publishing (UK) Limited | Wholesale & retail | 2003 |
| Chil Holdings Ltd | Financial services | 2026 |
| Chilax Ltd | Hospitality | 2025 |
| Chis-Lets Property Investments Ltd | Real estate | 2019 |
| Chohan Orford Consultancy Ltd | Professional & scientific | 2025 |
| Chris Dittmann Racing Ltd | Arts & recreation | 2016 |
| Chris Stephens Consultancy Limited | Professional & scientific | 2017 |
| CI Associates Limited | Professional & scientific | 2023 |
| CIS Carpentry & Brickwork Ltd | Construction | 2019 |
| CIS Developments Ltd | Construction | 2026 |
| CKC Technologies Ltd | Information & communication | 2016 |
| Ckms Property Ltd | Real estate | 2018 |
| Claire Bowes Consulting Limited | Professional & scientific | 2018 |
| Claire Clarke Ltd | Administrative & support | 2021 |
| Cleaner Safer Group | Professional & scientific | 2022 |
| Clear Golf Ltd | Education | 2018 |
| Clearfield Estates (Gloucestershire) Limited | Construction | 2013 |
| Clearwater Products Limited | Wholesale & retail | 2000 |
| Clee View Homes Limited | Construction | 2013 |
| Cleeve Garden Services Limited | Administrative & support | 2021 |
| Cleeve Technology Limited | Wholesale & retail | 2002 |
| Clemas & Co. Limited | Manufacturing | 1987 |
| Clements Property Ltd | Real estate | 2024 |
| Clever (Business Websites) Ltd | Information & communication | 2021 |
| Clinical Microbiology Consultancy Limited | Education | 2011 |
| Clinical Physio Ltd | Education | 2020 |
| Clive Woolford Motor Engineers Ltd | Wholesale & retail | 2007 |
| CLS Properties & Investments Ltd | Real estate | 2022 |
| Clutton COX Limited | Professional & scientific | 2014 |
| Clydach Contractors Limited | Manufacturing | 2024 |
| Coach House Consulting Ltd | Professional & scientific | 2023 |
| Coco Sweets & Chocolate Ltd | Wholesale & retail | 2021 |
| Coffee MER MED Ltd | Hospitality | 2024 |
| Cognito Education Limited | Education | 2017 |
| Cognizens Limited | Information & communication | 2021 |
| Cold Clad Ltd | Construction | 2007 |
| Cold Clad Projects Limited | Construction | 2020 |
| Cold Store & Refrigeration Services Ltd | Administrative & support | 2020 |
| Coldpress & Locomotion Special Projects Ltd | Arts & recreation | 2022 |
| Colin Wellings HGV Driving. Ltd | Manufacturing | 2018 |
| Colt Precision Limited | Manufacturing | 2014 |
| Comacooo Ltd | Arts & recreation | 2025 |
| Complete Building Solutions (Worcester) Ltd | Construction | 2018 |
| Connect Electrical Services (South West) Ltd | Construction | 2025 |
| Consentum Ltd | Wholesale & retail | 2001 |
| Continuum Properties Limited | Real estate | 2022 |
| Contizens UK CIC | Health & social care | 2019 |
| Conwy Valley (Dairy Products) Ltd | Extraterritorial | 2007 |
| Cool Concerns Ltd | Other services | 2003 |
| Cooper Building Works Ltd | Construction | 2019 |
| Cooper Groundworks Ltd | Construction | 2015 |
| Cooper Medical Services Limited | Health & social care | 2014 |
| Copper Bidco Limited | Professional & scientific | 2012 |
| Copper FOX 1998 Ltd | Wholesale & retail | 2020 |
| Copper Midco 1 Limited | Professional & scientific | 2012 |
| Copper Midco 2 Limited | Professional & scientific | 2012 |
| Copperfields Financial Management Limited | Financial services | 2009 |
| Core Development Group Ltd | Administrative & support | 2026 |
| Corelink Data Ltd | Manufacturing | 2026 |
| Corinium Academic Solutions Limited | Professional & scientific | 2019 |
| Cornell DE MEL Home Finance Ltd | Financial services | 2025 |
| Corsica Coachworks Limited | Manufacturing | 2021 |
| Cotswold Accommodation Ltd | Real estate | 2022 |
| Cotswold and Vale Fencing and Landscape Supplies Limited | Administrative & support | 2003 |
| Cotswold Bespoke Builders Ltd | Construction | 2026 |
| Cotswold Build Cleans Ltd | Construction | 2021 |
| Cotswold Business Support Ltd | Administrative & support | 2021 |
| Cotswold Choice Nutrition Ltd | Wholesale & retail | 2025 |
| Cotswold Collective Ltd | Administrative & support | 2023 |
| Cotswold Construction 24:7 Ltd | Construction | 2014 |
| Cotswold Corporate Racing Limited | Professional & scientific | 2026 |
| Cotswold County Contracts Limited | Construction | 2018 |
| Cotswold Developments Gloucestershire Limited | Construction | 2021 |
| Cotswold Edge Leisure Vehicles Limited | Administrative & support | 2009 |
| Cotswold Engineering Supplies Limited | Wholesale & retail | 1991 |