| Cordd Limited | Health & social care | 2014 |
| Cordova Financials Ltd | Professional & scientific | 2025 |
| Core Blueprint Ltd | Information & communication | 2024 |
| Core Business Systems Limited | Information & communication | 2001 |
| Core Construction Wiltshire Limited | Construction | 2017 |
| Core Estate Maintenance Ltd | Real estate | 2023 |
| Core Heating (Bristol & Bath) Limited | Construction | 2015 |
| Core Maintenance Solutions Ltd | Construction | 2015 |
| CORE7 Ltd | Administrative & support | 2015 |
| Corell Consulting Limited | Professional & scientific | 2020 |
| Coreshade Installations Ltd | Construction | 2026 |
| Corespan Utilities Ltd | Construction | 2026 |
| Coretech Civil Engineering Limited | Construction | 2016 |
| Corfe House Management Company Limited | Households | 1986 |
| Corinium Carpentry Ltd | Construction | 2015 |
| Corinium Continuous Limited | Manufacturing | 1991 |
| Corinium Mushrooms Ltd | Agriculture & fishing | 2024 |
| Corkgate Limited | Real estate | 1982 |
| Cornell Roofing Ltd | Construction | 2025 |
| Cornellwebb Limited | Hospitality | 2026 |
| Corner Water Consulting Ltd | Professional & scientific | 2021 |
| Cornerstone Development Group Ltd | Construction | 2022 |
| Cornerstone Electrico Systems Ltd | Manufacturing | 2017 |
| Cornerstone Realties Limited | Real estate | 2024 |
| Cornish Hospitality Limited | Hospitality | 2021 |
| Cornys Ltd | Hospitality | 2024 |
| Corpay Funding (UK) Limited | Financial services | 2025 |
| Corpay Group 4 Holdco Ltd. | Financial services | 2025 |
| Corpay One UK Limited | Information & communication | 1996 |
| Corpay UK Newco Ltd. | Financial services | 2025 |
| Corporate Event Services Holding Limited | Administrative & support | 2024 |
| Corporate Event Services Limited | Administrative & support | 1996 |
| Corse Kart Components Ltd | Wholesale & retail | 2023 |
| Corsham Kebab Van Limited | Hospitality | 2025 |
| Corsham Tasty Bites Ltd | Hospitality | 2009 |
| Corsham Town Football Club Ltd | Administrative & support | 2022 |
| Corte Nobre Limited | Wholesale & retail | 2026 |
| Cortex IT & Data Solutions Limited | Information & communication | 2026 |
| Cortus Holdings Limited | Financial services | 2025 |
| Cortus Limited | Manufacturing | 2011 |
| Corum Construction Ltd | Construction | 2018 |
| Cosmebuy Ltd | Health & social care | 2024 |
| Cosmetrain Ltd | Health & social care | 2024 |
| Cosmetreat Ltd | Health & social care | 2024 |
| Cosmic Repairs Ltd | Construction | 2020 |
| Cosmiclick Ltd | Professional & scientific | 2025 |
| Cosmo Castles Limited | Arts & recreation | 2021 |
| Cosmo Lush Advisory Ltd | Professional & scientific | 2026 |
| Cosnev Ltd | Health & social care | 2018 |
| Cost OPT Ltd | Professional & scientific | 2024 |
| Costa Exclusives Limited | Wholesale & retail | 2025 |
| Costa Rica Railway Limited | Administrative & support | 1886 |
| Costa Tech UK Ltd | Wholesale & retail | 2021 |
| Cosway Court Management Company Limited | Households | 2020 |
| Cosy Cuppa Ltd | Hospitality | 2025 |
| Cosy Shelters Ltd | Real estate | 2024 |
| Coszus Ltd | Wholesale & retail | 2023 |
| Cotmarsh Tannery CIC | Manufacturing | 2024 |
| Cotopaxi Commercial Limited | Professional & scientific | 2025 |
| Cotswold & Crescent Ltd | Real estate | 2025 |
| Cotswold & Thread Ltd | Manufacturing | 2026 |
| Cotswold Ambassador Ltd | Transport & logistics | 2024 |
| Cotswold Apps Limited | Information & communication | 2016 |
| Cotswold Bespoke Furniture Limited | Manufacturing | 2025 |
| Cotswold Bespoke Homes Limited | Construction | 2018 |
| Cotswold Breaks Ltd | Real estate | 2021 |
| Cotswold Career Concierge Limited | Professional & scientific | 2022 |
| Cotswold Cleaners Limited | Administrative & support | 2019 |
| Cotswold Clearance Ltd | Water & waste | 2022 |
| Cotswold Commercial Management Services Ltd | Professional & scientific | 2018 |
| Cotswold Connexions Limited | Transport & logistics | 2024 |
| Cotswold Cookery School & Events Ltd | Hospitality | 2022 |
| Cotswold Cottage Rentals Limited | Real estate | 2023 |
| Cotswold Glass Studio Limited | Wholesale & retail | 2020 |
| Cotswold GRP and Composites Limited | Professional & scientific | 2015 |
| Cotswold Hearing Limited | Health & social care | 2017 |
| Cotswold House Services Limited | Households | 2021 |
| Cotswold Kitchen Fitting Ltd | Manufacturing | 2020 |
| Cotswold Lakes Brew Co. Ltd | Manufacturing | 2021 |
| Cotswold Lakes Consulting Limited | Professional & scientific | 2023 |
| Cotswold Leadwork Limited | Construction | 2024 |
| Cotswold Neurodevelopmental Service Ltd | Health & social care | 2021 |
| Cotswold Nook Limited | Hospitality | 2022 |
| Cotswold Outdoor Group Ltd | Wholesale & retail | 1997 |
| Cotswold Packaging Group Limited | Administrative & support | 1993 |
| Cotswold Packaging Holdings Limited | Real estate | 2019 |
| Cotswold Paddleboard Company Ltd | Administrative & support | 2021 |
| Cotswold Paddleboard Hire Ltd | Administrative & support | 2021 |
| Cotswold Painting & Decorating Ltd | Construction | 2017 |
| Cotswold Phones Ltd | Information & communication | 2025 |
| Cotswold Psychotherapy Ltd | Health & social care | 2020 |
| Cotswold Rods Group Ltd | Wholesale & retail | 2026 |
| Cotswold Rods Ltd | Manufacturing | 2012 |
| Cotswold Sleeps Limited | Hospitality | 2021 |
| Cotswold Static Control Products Limited | Extraterritorial | 1985 |
| Cotswold Stone Construction Ltd | Construction | 2021 |
| Cotswold Talent Solutions Ltd | Administrative & support | 2023 |
| Cotswold Timber Trends Ltd | Construction | 2019 |
| Cotswold Trade Centre Limited | Construction | 2026 |
| Cotswold Trading Limited | Wholesale & retail | 2008 |