| Cotswold Racing Ltd | Tetbury | 2022 |
| Cotswold Retreats Ltd | Cirencester | 2018 |
| Cotswold Riding Opportunities Project CIC | Winchester | 2019 |
| Cotswold Rugby Academy Limited | Chipping Norton | 2023 |
| Cotswold Sailing Club Limited | Cirencester | 2025 |
| Cotswold Sauna Club Limited | Cheltenham | 2025 |
| Cotswold Strength Coach Ltd | Fairford | 2026 |
| Cotswold Trail Events Ltd | Evesham | 2022 |
| Cotswold Training Club Ltd | Banbury | 2025 |
| Cotswold Trampolining Ltd | Cirencester | 2026 |
| Cotswold Water SKI Club Limited | Swindon | 1998 |
| Cotswold Wild Life Park Limited | Oxon | 1971 |
| Cotswolds Art Co Ltd | Broadway | 2025 |
| Cotswolds Automotive Development Company Limited | London | 2022 |
| Cotswolds Pilates Company Ltd | Witney | 2025 |
| Cottage Cards Limited | Leicester | 2020 |
| Cottage Farm Stables Limited | Stratford-Upon-Avon | 2012 |
| Cottage I Company Limited | Canterbury | 2022 |
| Cottagefield Stables Limited | Hereford | 2013 |
| Cottagers Plot Livery Service Limited | Laceby | 2010 |
| Cottingham Lawn Tennis Club Limited(The) | Beverley | 1951 |
| Cottingham Leisure Limited | Cottingham | 1993 |
| Cottingham Recreation Club,Limited(The) | Hessle | 1927 |
| Cottingley Bridge Allotment Gardens Limited(The) | Shipley | 1919 |
| Cottle's Castles Limited | Romford | 2023 |
| Cotton Claud Limited | Norwich | 2026 |
| Cotton EYE Limited | London | 2020 |
| Cotton Productions Limited | Slough | 2022 |
| Cotton Reel Entertainment Limited | Stockport | 2014 |
| Cottonpawscreatives Ltd | Biggleswade | 2021 |
| Cottrell Park Ltd | South Glamorgan | 1991 |
| COU COU Intimates Ltd | London | 2017 |
| Cou-Cou Theatre Productions CIC | Thornton Cleveleys | 2018 |
| Couch Potato Run Club Ltd | Finnieston | 2025 |
| COUCH2SUMMIT Ltd | London | 2020 |
| Cougar Bidco London Limited | New Malden | 2013 |
| Cougar Holdco London Limited | New Malden | 2013 |
| Cougarmania Ltd | Leeds | 2018 |
| Coughtrey Limited | Chichester | 2018 |
| Coul EVS Ltd | Liverpool | 2025 |
| Could IT BE Magic Ltd | Manchester | 2019 |
| Could Run Should Run Ltd | Bury St. Edmunds | 2026 |
| Could U B Ltd | Billericay | 2022 |
| Couldridge Enterprise Limited | Old Buckenham | 2025 |
| Couleurlive Ltd | Shrewsbury | 2023 |
| Coulomb Group Limited | Ringwood | 2022 |
| Coulon & Coulon Limited | Thornton-Cleveleys | 2017 |
| Coulson Ltd | London | 2023 |
| Council of the Northern Ireland WAR Memorial (Incorporated)-The | | 1950 |
| Count of Conamara Ltd | Bury St. Edmunds | 2025 |
| Counterfeit Group Ltd | Newcastle Upon Tyne | 2015 |
| Counterminers CIC | Bushey | 2024 |
| Counterminers Productions Ltd | Harrow | 2026 |
| Counterparts Music Theatre Arts Limited | Gunnislake | 2005 |
| Counterpoint Musical Services Limited | Todmorden | 2003 |
| Countesthorpe Cricket Club Limited | Leicester | 2020 |
| Countgrade Limited | Bridgend | 1974 |
| Counties Football Academies Group Ltd | London | 2025 |
| Counting What Counts Ltd | London | 2014 |
| Country and Coastal Parks 1 Holdco Limited | Milton Keynes | 2024 |
| Country and Coastal Parks 1 Limited | Milton Keynes | 2024 |
| Country and Coastal Parks 2 Holdco Limited | Milton Keynes | 2024 |
| Country and Coastal Parks 2 Limited | Milton Keynes | 2024 |
| Country and Coastal Parks 3 Holdco Limited | Milton Keynes | 2024 |
| Country and Coastal Parks 3 Limited | Milton Keynes | 2024 |
| Country and Coastal Parks 4 Holdco Ltd | Milton Keynes | 2025 |
| Country Club and Leisure Limited | Hatfield | 2009 |
| Country Gardens Yorkshire Limited | Doncaster | 2012 |
| Country Golf Hull Ltd | Beverley | 2019 |
| Country Lane Limited | Verwood | 2003 |
| Country Life Activity Centre Ltd | Llandrindod Wells | 2018 |
| Country Live Group Ltd | Chester Le Street | 2026 |
| Country Mile Productions Ltd | London | 2019 |
| Country Music Factory Ltd | Swindon | 2018 |
| Country Nation Ltd | London | 2025 |
| Country Superstars Ltd | East Malling | 2015 |
| Country to Canvas Limited | Warrington | 2026 |
| Countryandco Ltd | Malton | 2009 |
| Countryfit Limited | Witney | 2025 |
| Countrylinetime Ltd | Liverpool | 2026 |
| Countryside Models Ltd. | Templecombe | 2000 |
| Countrywize Limited | London | 2024 |
| County Air Ambulance Trading Limited | Walsall | 2012 |
| County Antrim Yacht Club Limited | Carrickfergus | 2012 |
| County Armagh Grand Orange Lodge Community Development Committee Limited | Armagh | 2005 |
| County Armagh Vintage Vehicle Club Limited | Portadown | 1987 |
| County Castle Fitness Ltd | Exeter | 2025 |
| County Classics Motor Museum | Bridgwater | 2019 |
| County Durham Community Projects Ltd | Chester Le Street | 2016 |
| County Luxdon Laundry Limited | 33 Wellington Street | 1938 |
| County Sports Limited | Malton | 2013 |
| County Sports Surfaces Limited | Stockport | 2009 |
| Couper Collection Sussex CIC | Hove | 2020 |
| Coupleagolfers Ltd | Swansea | 2025 |
| Courage Creative Ltd | Houghton Le Spring | 2011 |
| Coureio Ltd | London | 2026 |
| Coursegood Limited | London | 1999 |
| Court 1 Ltd | Peterborough | 2020 |
| Court DE Padel Hull Limited | Nottingham | 2025 |
| Court DE Padel Limited | Nottingham | 2025 |