| Club Gymnasia Limited | Newtownabbey | 2014 |
| Club Karma Limited | London | 2003 |
| Club Kick Ltd | Ingatestone | 2017 |
| Club Kingswood Limited | Basildon | 2005 |
| Club Kudo Limited | Cardiff | 2024 |
| Club Lanciasport Limited | | 2007 |
| Club Live Showband Limited | London | 2023 |
| Club Love Ltd | Bristol | 2023 |
| Club MOB Ltd | London | 2014 |
| Club Muso Ltd | Leamington Spa | 2020 |
| Club Nautique Ltd | Dalton-In-Furness | 2003 |
| Club Operations Ltd | Glasgow | 2025 |
| Club Pace Limited | Southampton | 2025 |
| Club Padel Group Limited | Salisbury | 2025 |
| Club Padel South East Ltd | Maidstone | 2025 |
| Club Padelite Limited | Leicester | 2025 |
| Club Penybont Limited | Bridgend | 2013 |
| Club Perform Ltd | Glasgow | 2026 |
| Club Pickle Limited | London | 2023 |
| Club Pilates Limited | Newcastle Upon Tyne | 2023 |
| Club Platinum Limited | Craigavon | 2016 |
| Club Qubana Limited | Birmingham | 2025 |
| Club Radio Ltd | Hitchin | 2023 |
| Club Rampage Ltd | Sheffield | 2025 |
| Club RAT Entertainment Ltd | Manchester | 2026 |
| Club Reformer Ltd | Dronfield | 2024 |
| Club Reformer Studios Ltd | Fleet | 2024 |
| Club Reset Limited | Rotherham | 2025 |
| Club Romantico Limited | Manchester | 2021 |
| Club Scotland CIC | Glasgow | 2025 |
| Club Solo Ltd | London | 2020 |
| Club Sports Group Master Franchise Ltd | London | 2023 |
| Club Studio Ltd | Altrincham | 2013 |
| Club Thorne CIC | Doncaster | 2020 |
| Club Ticket Promotions Limited | London | 2021 |
| Club Towers Limited | Bedford | 2015 |
| Club Twenty Two Ltd | Epsom | 2024 |
| Club Vibora Ltd | Stoke-On-Trent | 2026 |
| Club VO2 Ltd | Craigavon | 2026 |
| Club Woodham Ltd | Essex | 2006 |
| CLUB24FITNESS Belfast Ltd | Bangor | 2026 |
| CLUB24FITNESS Lisburn Ltd | Belfast | 2023 |
| CLUB24FITNESS Ltd | Bangor | 2021 |
| CLUB3000 Leisure Ltd | Liverpool | 2008 |
| CLUB87 Investments Limited | London | 2010 |
| Clubaz Limited | Macclesfield | 2010 |
| Clubb's Yard Studios Limited | Gravesend | 2022 |
| Clubbed! Ltd | London | 2025 |
| Clubbercise Ltd | Keele | 2013 |
| Clubbing the Bard Limited | Faringdon | 2023 |
| Clubbrunch Limited | Cardiff | 2018 |
| Clubby Ltd | London | 2025 |
| Clubcash Swindon Ltd | Swindon | 2024 |
| Clubclass Music Management Ltd | Maidstone | 2006 |
| Clubex Limited | Bolton | 2025 |
| Clubfit Golf Ltd | Morecambe | 2014 |
| Clubgolf (Scotland) Limited | Dunfermline | 2006 |
| Clubhouse 1872 Ltd | Swansea | 2025 |
| Clubhouse at Valentines Limited | London | 2025 |
| Clubhouse Collective Limited | Stoke-On-Trent | 2014 |
| Clubhouse Fitness Limited | Radlett | 2024 |
| Clubhouse Gyms Ltd | Newcastle Upon Tyne | 2019 |
| Clubhouse JIU Jitsu Ltd | Coalville | 2022 |
| Clubhouse Leaders Limited | Church Fenton | 2023 |
| Clubhouse Leisure Ltd | Haywards Heath | 2023 |
| Clubhouse Meadowhall Limited | Doncaster | 2026 |
| Clubhouse Mobile Mini Golf Ltd | York | 2018 |
| Clubhouse Peckham Limited | London | 2025 |
| Clubhouse-Gyms (Blackburn) Ltd | Bolton | 2025 |
| Clubhouse-Uk Ltd | Bolton | 2025 |
| Clubmans Register Limited | London | 2019 |
| Clubmotion Ltd | Dukinfield | 2025 |
| Clubnorth Limited | Leeds | 2020 |
| Clubnorth NH Limited | Leeds | 2023 |
| Clubnorth QP Limited | Leeds | 2020 |
| Clubplates Limited | Sale | 2011 |
| Clubready Ltd | Chafford Hundred | 2025 |
| Clubs Together UK | London | 1988 |
| Clubscomplete Limited | Ashby-De-La-Zouch | 2010 |
| Clubstickets Ltd | London | 2015 |
| Clubsub Ltd | Stoke On Trent | 2014 |
| Clubsync Ltd | Magherafelt | 2025 |
| Clubworld Sports Limited | Glasgow | 2012 |
| Cluck N Games Ltd | St. Austell | 2026 |
| Clucking BEE Wordsmiths Ltd | Wincanton | 2020 |
| Clue Collectors Limited | Heywood | 2024 |
| Clue Cracker Limited | Tonbridge | 2019 |
| Clue Cubed Ltd | London | 2021 |
| Clue Finders Ltd | Liverpool | 2014 |
| Clue HQ - Harrogate Ltd | Harrogate | 2018 |
| Clue HQ Bedford Limited | Sandy | 2017 |
| Clue HQ Ltd | Warrington | 2014 |
| Clue HQ Somerton Ltd | Somerton | 2018 |
| Cluedini (Yarm) Limited | Yarm | 2018 |
| Cluedo Stage Productions Limited | London | 2021 |
| Cluego Ltd | Sutton Coldfield | 2014 |
| Clueless the Musical Limited | Godalming | 2023 |
| Cluetopia Braintree Ltd | Braintree | 2024 |
| Cluetopia Colchester Ltd | Harwich | 2026 |
| Cluetopia Ltd | Ipswich | 2022 |