| College of Self-Organised Learning Limited | | 2003 |
| College of Sport, Exercise and Musculoskeletal Medicine | Auckley | 2026 |
| College of Suffolk | Cardiff | 2019 |
| College of Technology London Limited | London | 2001 |
| College of the Motor Industry Limited(The) | Hertford | 1986 |
| College of VCP Limited | Milton Keynes | 2019 |
| College of Victoria Ltd | London | 2025 |
| College of World Sport Holdings Limited | London | 2021 |
| College of World Sport Limited | London | 2019 |
| College Road Community CIC | Rotherham | 2024 |
| College Town Montessori (Group) Limited | Camberley | 2021 |
| College Town Montessori Nursery School Limited | Hampshire | 2002 |
| College Trainer Ltd | Telford | 2020 |
| Collegeconnect Limited | London | 2024 |
| Colleges Scotland | Stirling | 1993 |
| Colleges Wales / Colegau Cymru Limited | Cardiff | 1993 |
| Collegiate (Montessori) Limited | Sheffield | 1980 |
| Colliden Ltd | London | 2025 |
| Colliderscience CIC | Wandsworth | 2015 |
| Collier Education Ltd | Accrington | 2023 |
| Collierswood Preschool Willows Limited | London | 2025 |
| Collin Care Holdings Limited | Glasgow | 2025 |
| Collin Care Limited | Glasgow | 2008 |
| Collingbourne Day Nursary Ltd | Birmingham | 2024 |
| Collingham Gardens Nursery | London | 2009 |
| Collingham Limited | | 1975 |
| Collingwood British Education Limited | Sunbury | 2007 |
| Collingwood College | Camberley | 2011 |
| Collingwood School Educational Trust Limited | Wallington | 1978 |
| Collingwood School Limited | Stanmore | 2019 |
| Collins Coaching and Consultancy Ltd | St. Albans | 2019 |
| Collins Salonna Ltd | Brentford | 2024 |
| Collinson Family Coaching Ltd | Saltburn | 2024 |
| Collisondeih Education Ltd | Stanwell | 2019 |
| Colloquial Collective Ltd | Lewisham | 2014 |
| Colloquium Limited | London | 2019 |
| Collthomas Associates Ltd | London | 2014 |
| Collyweston Stone Slating Trust Limited | Kettering | 1982 |
| Collywobbles Ltd | Inverness | 2022 |
| Collz Digital Design Ltd | Brackley | 2024 |
| Colnaghi Foundation | London | 2017 |
| Colne Valley Dogs Ltd | Batley | 2025 |
| Colombo Tutor Lessons Limited | London | 2025 |
| Colon Hydrotherapy Academy Ltd | Sutton-In-Ashfield | 2026 |
| Colorful Cultures Limited | London | 2017 |
| Colossal Network Educational Services Ltd | Leigh-On-Sea | 2025 |
| Colosseum of Chaos Ltd | Hull | 2025 |
| Colour Group (Great Britain) (the) | Northampton Square London | 1961 |
| Colour Kids Club Ltd | East Horsley | 2025 |
| Colour ME Bright Limited | Telford | 2025 |
| Colour ME Happy Limited | Stockport | 2010 |
| Colour Wheel Art Class UK Limited | Radstock | 2015 |
| Colour Wheel County Durham Ltd | Durham | 2018 |
| Colour Wheel Didsbury Ltd | Manchester | 2018 |
| Colour Wheel Eastbourne Ltd | Hailsham | 2026 |
| Colour Wheel Muswell Hill Ltd | London | 2025 |
| Colour Wheel Salisbury Ltd | Salisbury | 2023 |
| Colour Wheel Worcester Limited | Ipswich | 2019 |
| Colour'Ed Ltd | London | 2025 |
| Colourbox Montessori School Ltd | Bury St. Edmunds | 2010 |
| Coloured Hearts C.I.C. | Gateshead | 2025 |
| Coloured Sheep Limited | Stoke-On-Trent | 2019 |
| Colourful Brick Sessions Ltd | Manchester | 2024 |
| Colourful CPD Ltd | Sheffield | 2017 |
| Colourful Events Limited | Middlesex | 2010 |
| Colourful Heritage Limited | Finnieston | 2012 |
| Colourful Sounds Ltd | London | 2021 |
| Colourfully Engaged Ltd | Northampton | 2011 |
| Colourmein Wellbeing CIC | St. Albans | 2024 |
| Colours Immortalis Ltd | London | 2020 |
| Colourstrings Scotland CIC | Dunblane | 2024 |
| Colourwheel Bath Ltd | Radstock | 2024 |
| Colourwheel Caerphilly Ltd | London | 2023 |
| Colourwheel Cardiff Limited | Newport | 2025 |
| Colourwheel Cheltenham Ltd | Cheltenham | 2018 |
| Colourwheel East Cheshire Limited | Stockport | 2019 |
| Colourwheel Fylde Coast Limited | Lancaster | 2021 |
| Colourwheel Kingston Upon Thames Ltd | Kingston Upon Thames | 2026 |
| Colourwheel North Hants Limited | Fleet | 2020 |
| Colourwheel Pinner Ltd | London | 2026 |
| Colourwheel Solihull Ltd | Solihull | 2019 |
| Colourwheel Watford Ltd | London | 2026 |
| Colouryourenglish Limited | Glasgow | 2026 |
| Cols Skill Hub Ltd | London | 2025 |
| Colsey Data Limited | Rochester | 2023 |
| Colsol Wales Limited | Colwyn Bay | 2016 |
| Colston Bassett School Limited | Northampton | 2007 |
| Colston's School Foundation | Bristol | 2009 |
| Columbia Road Community Events CIC | London | 2025 |
| Columbus Bidco Limited | Whiteley | 2012 |
| Columbus Midco Limited | Whiteley | 2012 |
| Columbus Topco Limited | Whiteley | 2012 |
| Colwell College Limited | Leicester | 2016 |
| Colwells Driving Tuition Limited | Lowestoft | 2009 |
| Colyton Grammar School Academy Trust | Colyton | 2010 |
| Comagnify Ltd | Bristol | 2026 |
| Comas Psychology Ltd | Livingston | 2024 |
| Combat Academy Ltd | Slough | 2024 |
| Combat Base Wakefield Ltd | Wakefield | 2025 |
| Combat Classroom Ltd | Stockport | 2026 |