| CLR School of Dance CIC | Arts & recreation | 2017 |
| Clubonedance Ltd | Hospitality | 2025 |
| CMC Medical Services Ltd | Health & social care | 2013 |
| CMD ALT INK Ltd. | Arts & recreation | 2021 |
| CMG Leasehold Management Limited | Real estate | 2003 |
| CMG Risk Management Ltd | Real estate | 2011 |
| CML Engineering Ltd | Manufacturing | 2015 |
| CMM Ninja Limited | Professional & scientific | 2023 |
| CMS Holdings (Gloucester) Limited | Financial services | 2019 |
| CNC Bristol Ltd | Manufacturing | 2023 |
| Co-Operative Futures Ltd | Administrative & support | 2000 |
| Coach Education & Management Ltd | Education | 2024 |
| Coacha Software Limited | Information & communication | 2004 |
| COACHING4KIDS Ltd | Education | 2019 |
| Coacto Limited | Professional & scientific | 2016 |
| Coates Contracting Ltd | Construction | 2024 |
| Coates Group Holdings Ltd | Construction | 2017 |
| Coates Hire Ltd | Administrative & support | 2020 |
| Coates Homes Ltd | Construction | 2017 |
| Coatham Consulting Limited | Professional & scientific | 2023 |
| Coats and Tails Ltd | Other services | 2019 |
| Cobus Spaces Limited | Wholesale & retail | 2017 |
| Cockbury Court Management Limited | Households | 2010 |
| Coco Nail Bar KD Ltd | Other services | 2023 |
| Code Mechanics Limited | Information & communication | 1999 |
| Code Sixty SIX Limited | Information & communication | 2013 |
| Code Three Solutions Ltd | Information & communication | 2024 |
| Codeworx Limited | Information & communication | 2005 |
| Codex Analysis Ltd | Arts & recreation | 2021 |
| Coffee House 43 Limited | Hospitality | 2022 |
| Coffee on the Prom Ltd | Hospitality | 2026 |
| Cogent Developments Limited | Real estate | 2003 |
| Colabella Limited | Financial services | 2020 |
| Cold Barrels Ltd | Other services | 2025 |
| Cold Store Maintenance Ltd. | Extraterritorial | 1964 |
| Coldbrock Recruitment Ltd. | Administrative & support | 2015 |
| Coldsight Limited | Wholesale & retail | 2021 |
| Cole Avenue Hand Car Wash Ltd | Wholesale & retail | 2023 |
| Cole Logistics Limited | Transport & logistics | 2019 |
| Cole Plastering Ltd | Construction | 2019 |
| Cole Property Group Ltd | Real estate | 2025 |
| Coleford Leisure (Holdings) Limited | Professional & scientific | 2014 |
| Coleford Leisure Limited | Wholesale & retail | 2003 |
| Coleford Pet Shop Limited | Wholesale & retail | 2023 |
| Colefordian Limited | Real estate | 2024 |
| Colehurst Holdings Limited | Real estate | 2023 |
| Collect Correct TCG Limited | Wholesale & retail | 2025 |
| Collect With S Limited | Wholesale & retail | 2026 |
| Collective Knowledge Limited | Information & communication | 2015 |
| College Court (Gloucester) Limited | Households | 2009 |
| Collens Healthcare Ltd | Administrative & support | 2021 |
| Colley Electrical Contracting Ltd | Construction | 2019 |
| Collingbourne Property Ltd | Real estate | 2024 |
| Collingwood Estates Limited | Construction | 2019 |
| Collins and Precious Property Ltd | Real estate | 2026 |
| Coln Gardens Management Company Limited | Real estate | 2011 |
| Colocentric Limited | Information & communication | 2010 |
| Colourcrete UK Limited | Construction | 2024 |
| Colston Media Ltd | Professional & scientific | 2012 |
| Comfyfood Ltd | Hospitality | 2026 |
| Comicsdi Media Limited | Information & communication | 2023 |
| Commercial Aviation Training Services Limited | Education | 2017 |
| Commercial Bird Control Limited | Agriculture & fishing | 2018 |
| Commercial Carpet Tiles UK Ltd | Wholesale & retail | 2017 |
| Commercial Diving Ltd | Administrative & support | 2025 |
| Commprop Solutions Ltd | Professional & scientific | 2023 |
| Communications Innovations Ltd | Wholesale & retail | 2023 |
| Community Cheer and Dance Academy CIC | Arts & recreation | 2015 |
| Community Connexions | Health & social care | 2006 |
| Community Foster Care | Health & social care | 1999 |
| Community Roots CIC | Professional & scientific | 2013 |
| Compass Tech Ltd | Financial services | 2025 |
| Compassionate Care Services Limited | Health & social care | 2020 |
| Compcare Consultancy Ltd | Professional & scientific | 2017 |
| Competent Home Care Ltd | Public administration | 2022 |
| Complete Building/Maintenance Gloucester Ltd | Construction | 2017 |
| Complete Creative Marketing Limited | Professional & scientific | 2021 |
| Complete Electrical & Security Ltd | Administrative & support | 2023 |
| Complete First AID Training Ltd | Education | 2024 |
| Complete Gates Ltd | Construction | 2020 |
| Complete Heating & Plumbing Limited | Construction | 2004 |
| Complete Irrigation Systems Limited | Manufacturing | 2004 |
| Complete Landscaping Cheltenham Limited | Administrative & support | 2016 |
| Complete Property Group Limited | Households | 2016 |
| Complex Electrical Installations Ltd | Construction | 2022 |
| Complex Group Properties Ltd | Real estate | 2023 |
| Compliance on Call Ltd | Professional & scientific | 2006 |
| Complicite Enterprises Limited | Arts & recreation | 2004 |
| Complicity Limited | Public administration | 2025 |
| Composite Building Supplies Ltd | Wholesale & retail | 2025 |
| Comprehensive Integrations Limited | Information & communication | 2019 |
| Computerworth Limited | Information & communication | 1990 |
| Conbar UK Limited | Manufacturing | 2008 |
| Concha Azul Limited | Hospitality | 2007 |
| Conclure Investments Limited | Real estate | 2021 |
| Coney Hill RFC Limited | Other services | 2013 |
| Coneybury Properties Limited | Real estate | 2015 |
| Confederation of Beauty Therapy and Cosmetology Limited | Other services | 2008 |
| Configure Solutions Limited | Information & communication | 2008 |
| Conforti Electrical Ltd | Construction | 2017 |