| Cotswold Water SKI Club Limited | Arts & recreation | 1998 |
| Cotswolds Prestige Build & Maintain Ltd | Construction | 2025 |
| Cottage D Limited | Health & social care | 2021 |
| Coughlin Enterprise Ltd | Real estate | 2025 |
| Counsellor Gabriel’S Therapy Ltd | Health & social care | 2024 |
| Country Green Heating Ltd. | Construction | 2017 |
| Country Logs Limited | Wholesale & retail | 1996 |
| Country Music Factory Ltd | Arts & recreation | 2018 |
| Country Sporting Supplies Ltd | Other services | 2016 |
| Countryside Commons Limited | Real estate | 1991 |
| County Estates Limited | Real estate | 2015 |
| County Homes (Wessex) Limited | Extraterritorial | 1947 |
| County Jewellers Ltd | Wholesale & retail | 2023 |
| County Jewellers Marlborough Limited | Other services | 2018 |
| County Park Management Limited | Extraterritorial | 1991 |
| County Park Residency Ltd | Construction | 2025 |
| County Recruitment Limited | Administrative & support | 2016 |
| County Wills (South West) Limited | Other services | 2003 |
| Courtney Cellular Limited | Administrative & support | 2008 |
| Cousins Cotswold Investments Limited | Real estate | 2020 |
| Coventry Business Park Management Limited | Real estate | 1993 |
| Coventry Farm Stores Ltd | Wholesale & retail | 2026 |
| Coveys Painting and Decorating Limited | Construction | 2015 |
| Covey’S Properties Ltd | Real estate | 2026 |
| Covingham Kingfisher Pre-School Ltd | Education | 2025 |
| Covingham Roundabout Preschool Limited | Education | 2009 |
| Covrigas Ltd | Transport & logistics | 2025 |
| COW Shed CNC Limited | Manufacturing | 2024 |
| Cowan Agricultural Services Ltd | Agriculture & fishing | 2011 |
| Cowan Land & Survey Ltd | Other services | 2013 |
| Cowbuzz Ltd | Agriculture & fishing | 2022 |
| Cowley Bros.(Wroughton) Limited | Construction | 1960 |
| Cowley Developments Limited | Construction | 2001 |
| Cowpoke and Cactus Ltd | Hospitality | 2025 |
| COX & Sons Building Contractors Limited | Construction | 2025 |
| Coyote Roadrunner Ltd | Transport & logistics | 2026 |
| Cozens Cars Limited | Wholesale & retail | 2018 |
| Cozmaster Ltd | Construction | 2017 |
| Cozy Comfortable Stays Ltd | Real estate | 2025 |
| Cozyfox Homes Ltd | Hospitality | 2022 |
| CP Tech Solutions Ltd | Information & communication | 2023 |
| CPO Interactive Ltd | Administrative & support | 2013 |
| CPR Marine Limited | Public administration | 2017 |
| CPR Technologies Ltd | Information & communication | 2025 |
| CR Class Limited | Manufacturing | 2020 |
| Crack Cards Ltd | Wholesale & retail | 2024 |
| Crafted Square Ltd | Wholesale & retail | 2026 |
| Crafty HOP Bars Ltd | Hospitality | 2018 |
| Craig Dixon Decorating Limited | Construction | 2018 |
| Craig Donnelly Building Contractors Ltd | Construction | 2017 |
| Craig's Professional Cleaning Services Ltd | Administrative & support | 2025 |
| Craima Cable Recycling Ltd | Water & waste | 2015 |
| Crane & Foley Property Ltd | Real estate | 2021 |
| Cranfield International Limited | Financial services | 2001 |
| Cranmer and Latimer Limited | Hospitality | 2008 |
| Crannis Technology Services Ltd | Construction | 2011 |
| Crapper & Sons Holdings Limited | Financial services | 2024 |
| Crapper & Sons Landfill Limited | Water & waste | 1999 |
| Cratos Limited | Wholesale & retail | 2017 |
| Crave Motors Limited | Wholesale & retail | 2023 |
| Crawford Hill Property Investment Ltd | Real estate | 2021 |
| Crazy Collectables Limited | Wholesale & retail | 2019 |
| CRC Systems Holdings Ltd | Information & communication | 2025 |
| CRE Payments Ltd | Professional & scientific | 2020 |
| Creary Investment Properties Limited | Real estate | 2020 |
| Create Studios Digital Media C.I.C. | Information & communication | 2014 |
| Creativ Company (UK) Ltd | Wholesale & retail | 2008 |
| Creative Business Ventures Limited | Wholesale & retail | 2003 |
| Creative Crochet by Shani Ltd | Wholesale & retail | 2024 |
| Creative Design Solutions Ltd | Information & communication | 2025 |
| Creative Fllo Services Ltd | Professional & scientific | 2019 |
| Creative Living Decor Ltd | Construction | 2016 |
| Creative Office and Commercial Interiors Limited | Administrative & support | 2011 |
| Creative Power Protection Group EOT Trustee Limited | Professional & scientific | 2026 |
| Creative Power Protection Group Limited | Financial services | 2024 |
| Creative Solutions Print Limited | Professional & scientific | 2025 |
| CREATIVE21 Group Ltd | Information & communication | 2026 |
| Creativexpression Limited | Professional & scientific | 2016 |
| Creator Code Ltd | Information & communication | 2024 |
| Creator Talent Management Limited | Other services | 2025 |
| Credence Dental Care Ltd. | Health & social care | 2015 |
| Credit Management Services Ltd | Administrative & support | 2019 |
| Credit Management Support Services Ltd | Administrative & support | 2015 |
| Credpure UK Ltd | Information & communication | 2025 |
| Cremin Consulting Limited | Information & communication | 2024 |
| Crescent Equity Limited | Real estate | 2024 |
| Crescent Records Limited | Administrative & support | 2015 |
| Crest Core Group Ltd | Wholesale & retail | 2025 |
| Crestling Group Ltd | Real estate | 2024 |
| Crestway Sussex Limited | Professional & scientific | 2017 |
| Cricklade & District Community Association | Arts & recreation | 2008 |
| Cricklade Court Management Limited | Real estate | 1987 |
| Cricklade Express Ltd | Wholesale & retail | 2026 |
| Cricklade Flexstorage Ltd | Transport & logistics | 2021 |
| Cricklade Launderette Ltd | Administrative & support | 2025 |
| Cricklade Management Limited | Households | 2020 |
| Cricklade Petanque Club Ltd | Arts & recreation | 2020 |
| Cricklade Pre-School Playgroup | Education | 2010 |
| Cricklade Road Management Company Limited | Households | 2004 |
| Cricklade Road RTM Company Ltd | Households | 2022 |