| Cavendish Continental Engineering Ltd | Wholesale & retail | 2013 |
| Cazo Limited | Real estate | 2016 |
| CBP Swindon Limited | Real estate | 2004 |
| Ccdrivingschool Ltd | Education | 2024 |
| Ccle Limited | Administrative & support | 2003 |
| CEC Healthcare Coding Limited | Other services | 2014 |
| Cedar & Stone Estate Stewardship Ltd | Real estate | 2026 |
| Cedarwood Property Management Services Limited | Administrative & support | 2012 |
| CEE VEE Limited | Wholesale & retail | 1998 |
| CEI Stroud Limited | Administrative & support | 2019 |
| Cejp Equine Coaching Limited | Arts & recreation | 2018 |
| Centaur Advisors Ltd | Professional & scientific | 2017 |
| Centre 4 Lymphatic Care Ltd | Health & social care | 2017 |
| Centre for the Acceleration of Social Technology | Information & communication | 2015 |
| CENTRE10 Limited | Arts & recreation | 2017 |
| Century Property Management Limited | Real estate | 2026 |
| CF Trusteeship | Extraterritorial | 2010 |
| CFI Awarding Ltd | Financial services | 2025 |
| CFL Trust Ltd | Education | 2012 |
| CFM Project Management Ltd | Professional & scientific | 2022 |
| CH Restaurant Limited | Hospitality | 2025 |
| Chadwick Oven Ltd | Extraterritorial | 2012 |
| Chalford Building Supplies Limited | Wholesale & retail | 1974 |
| Challinor Hitchcock-Yoo Ltd | Professional & scientific | 2020 |
| Champion Courier Ltd | Transport & logistics | 2025 |
| Champion Sausage Company Limited | Manufacturing | 2001 |
| Chancery Legal Search & Selection Limited | Professional & scientific | 2002 |
| Chandler Property Holdings Ltd | Construction | 2024 |
| Change Journey Navigator Limited | Administrative & support | 2023 |
| Changetalk Limited | Health & social care | 2015 |
| Chapel Associates Limited | Professional & scientific | 2010 |
| Chapter Next Ltd | Hospitality | 2026 |
| Charlea Community Gardens C.I.C. | Arts & recreation | 2016 |
| Charlotte Emma Ltd | Wholesale & retail | 2015 |
| Charlotte Ferrier Limited | Information & communication | 2017 |
| Charlotte Gibson Consultancy Limited | Professional & scientific | 2023 |
| Charlton Road Management Company Ltd | Real estate | 2013 |
| Chavenage Challenges Ltd | Arts & recreation | 2015 |
| CHEF63 Limited | Manufacturing | 2024 |
| Cheltenham Bedsteads Limited | Wholesale & retail | 2004 |
| Cheltenham Laundry Limited | Other services | 2023 |
| Cheltenham Smile Ltd | Health & social care | 2020 |
| Cherrycroft Development Management Company Limited | Households | 2011 |
| Chester Hill Support Services Ltd | Administrative & support | 2019 |
| Chestnut Landscaping Services Ltd | Administrative & support | 2012 |
| Chez Rose Ltd | Wholesale & retail | 2016 |
| Chipworksuk Ltd | Manufacturing | 2026 |
| Chivers Property Developments Private Ltd | Real estate | 2022 |
| Choosie Limited | Wholesale & retail | 2020 |
| Chords of Creation Ltd | Administrative & support | 2025 |
| Chris Bruce Limited | Information & communication | 2015 |
| Chris Francis Contractors Limited | Other services | 2000 |
| Chris Hartley Media Limited | Information & communication | 2021 |
| Chris HEY Productions Ltd | Professional & scientific | 2012 |
| Christine Welch Ltd | Other services | 2013 |
| Christophe Design Apartments Ltd | Hospitality | 2018 |
| Chroma Products Ltd | Wholesale & retail | 2011 |
| Cico Books Limited | Professional & scientific | 2008 |
| Cima-Mills Property Group Limited | Real estate | 2026 |
| Circus Sauce Limited | Extraterritorial | 2022 |
| Citizens Advice Stroud & Cotswold Districts Limited | Other services | 2002 |
| CJ Plastering (Cotswold) Ltd | Construction | 2021 |
| CJC Products Ltd | Professional & scientific | 2022 |
| CJL Mechanical Services Limited | Wholesale & retail | 2025 |
| CJU Consulting Limited | Information & communication | 2016 |
| Ckjcnc Ltd | Wholesale & retail | 2020 |
| Claire Hopkins Limited | Professional & scientific | 2009 |
| Clare Howlett Limited | Professional & scientific | 2018 |
| Clarita Solutions Ltd | Information & communication | 2021 |
| Classic Bahnstormers Limited | Wholesale & retail | 2020 |
| Classic Lines Limited | Construction | 2000 |
| Claxton Enterprises Ltd | Real estate | 2020 |
| Clean Wheels Ltd | Information & communication | 2009 |
| Clearpath Fire Risk Consultants Ltd | Financial services | 2026 |
| Clearwater Commercial Investments LLP | | 2021 |
| Clearwater Environmental Solutions Limited | Administrative & support | 2005 |
| Clearwater Equity Investments Limited | Professional & scientific | 2020 |
| Clearwater Estates & Investments Limited | Real estate | 2021 |
| Clearwater Limited | Construction | 1995 |
| Clearwater Properties (Cannock) Limited | Real estate | 2007 |
| Clearwater Properties Limited | Real estate | 2002 |
| Clearwater Property Group Limited | Households | 2008 |
| Clemency Rose Design Ltd | Wholesale & retail | 2019 |
| Clervaux Garden School | Education | 2018 |
| Clervaux Trust Limited | Education | 2001 |
| Clifford Plant Limited | Manufacturing | 2003 |
| Clifford R. Mcgill Limited | Construction | 1939 |
| Clifford Tamar Consulting Limited | Professional & scientific | 2023 |
| Climb in Flow Limited | Other services | 2023 |
| Close Nursery Garden Services Ltd | Administrative & support | 2007 |
| Clothing Direct Group Limited | Wholesale & retail | 2017 |
| Cloud Climb Solutions LLP | | 2018 |
| Cloud Perspective Limited | Information & communication | 2011 |
| Cloudz Limited | Information & communication | 2011 |
| CLT Heating and Plumbing Ltd | Construction | 2020 |
| Club Engage Ltd | Education | 2024 |
| CMD Architects Limited | Professional & scientific | 2011 |
| Cock Road Flats Ltd | Real estate | 2024 |
| Coco Caravan Limited | Hospitality | 2013 |
| Codefarm Ltd | Information & communication | 2024 |