| Celestial Labs Ltd | Birmingham | 2020 |
| Celestial Malik Ltd | London | 2025 |
| Celestial TEK Limited | Bath | 2022 |
| Celestine Management Limited | London | 2022 |
| Celestireal Ltd. | Tottenham | 2019 |
| Celf Caerleon Arts CIC | Newport | 2013 |
| Celf Collective C.I.C. | Fishguard | 2026 |
| Celfogwmpas | Llandrindod Wells | 1997 |
| Celh Limited | Wellingborough | 2024 |
| Celia Catchpole Limited | Oxford | 1997 |
| Celia Coco Company Limited | London | 2024 |
| Celia Paul Limited | London | 2023 |
| Celia Wilkinson Ltd | Ventnor | 2013 |
| Celino Pictures Ltd | Bromsgrove | 2026 |
| Cell Foundation | London | 2013 |
| Cell Project Space | London | 2004 |
| Cellar Arts Club C.I.C. | Worthing | 2017 |
| Cellardyke Tidal Pool Ltd | Leven | 2021 |
| Cello Press Limited | Oxford | 2000 |
| Celluloid Style Limited | Orpington | 2007 |
| Celo-Global Ltd | Norwich | 2013 |
| Celsius Recovery Ltd | Winscombe | 2026 |
| Celsius Studio Limited | Iver | 2025 |
| Celt Karate Limited | Rochester | 2012 |
| Celtfest Limited | Mildenhall | 2008 |
| Celtic Beat School of Dance Ltd | Port Talbot | 2023 |
| Celtic Bouncy Castles Ltd | Bridgend | 2022 |
| Celtic Burners Ltd | Farnborough | 2025 |
| Celtic Calligraphy Limited | Bishop'S Stortford | 2021 |
| Celtic Canvas Art Ltd | Glasgow | 2014 |
| Celtic Competitions Ltd | Swansea | 2023 |
| Celtic Country Sports Ltd | Bridgend | 2019 |
| Celtic Deaf Festival CIC | Llanfyrnach | 2024 |
| Celtic Development Pools Limited | | 1968 |
| Celtic Driven Sporting Club Ltd | Duns | 2025 |
| Celtic F.C. Development Fund Limited | | 1968 |
| Celtic F.C. Limited | | 2001 |
| Celtic Lady Productions Limited | Newry | 2017 |
| Celtic Laser Ltd | Llanelli | 2012 |
| Celtic Leisure | Port Talbot | 2015 |
| Celtic Media Festival Limited | Glasgow | 1999 |
| Celtic PLC | | 1897 |
| Celtic Quest Coasteering Limited | Haverfordwest | 2013 |
| Celtic Roots Community Music Academy Limited | Wirral | 2013 |
| Celtic Rugby UK Limited | London | 2016 |
| Celtic Sea Watersports Ltd | Narberth | 2020 |
| Celtic Strength & Fitness Ltd | Swansea | 2020 |
| Celtic Strength Ltd | Ruthin | 2021 |
| Celtic Stunts Limited | Hereford | 2016 |
| Celtic Supporters Limited | Glasgow | 2025 |
| Celtic Trails Limited | Chepstow | 2011 |
| Celtic Warriors Wheelchair Rugby Club CIC | Liskeard | 2025 |
| Celtic Wizard Ltd | Isle Of Lewis | 2024 |
| Celtic Worship Limited | Moray | 2021 |
| Celticfixer CYF | Caerphilly | 2024 |
| Celtman Ltd | Selkirk | 2012 |
| Celtronic Derry Ltd. | Derry | 2012 |
| Celtserve Limited | Nottingham | 1990 |
| Cely Design Studio Ltd | Congleton | 2025 |
| Celynen Collieries Institute and Memorial Hall Limited | Newport | 2010 |
| CEM Enterprises Ltd | Hatfield | 2013 |
| Cema Business Solutions Limited | Nottingham | 2003 |
| Cement Arts Ltd | Newhaven | 2025 |
| Cement Ltd | London | 2014 |
| Cemmick & Wylder Limited | Penrith | 2008 |
| Ceniza Roja Art Gallery Limited | Edinburgh | 2026 |
| Cenj Group Ltd | Deeside | 2025 |
| CENO2 Ltd | London | 2025 |
| Cenozoic Ltd | Bristol | 2026 |
| Centara Studios Ltd | Oadby | 2025 |
| Centaur Enterprises Limited | Leicester | 1982 |
| Centaur Gallery Limited | | 1952 |
| Centaur Riders Limited | 3 Dorset Rise | 2024 |
| Centaur Sporting Academy Ltd | Lincoln | 2025 |
| Centauri Events Ltd | Birmingham | 2025 |
| Centaurthebook Limited | London | 2016 |
| Centenary Field Limited | Woodford Green | 2025 |
| Centenary Sixes Ltd | Stanmore | 2025 |
| Centeno Limited | Bordon | 2014 |
| Centeno.Art Ltd | Hounslow | 2020 |
| Center Tattoos Ltd | London | 2023 |
| Centerprise Trust Limited | London | 1973 |
| Cento Projects Ltd | Glasgow | 2024 |
| Central Academy of Performing Arts Ltd | Pontypool | 2022 |
| Central Adventure Ltd | Bristol | 2019 |
| Central Ajax Football Club Limited | Warwick | 1991 |
| Central Avenue Function Band Ltd | Wakefield | 2018 |
| Central Bark Limited | Mobberley | 2014 |
| Central Bookmakers Limited | Belfast | 1979 |
| Central Casting International Limited | Middlesex | 2018 |
| Central Casting Limited | Middlesex | 2002 |
| Central Collections (Northern) Limited | Middlesex | 1989 |
| Central Competitions Limited | Leven | 2025 |
| Central CUE Sports Limited | Falkirk | 1999 |
| Central Fitness Limited | Keighley | 2008 |
| Central Indoor Tennis Club Limited | Falkirk | 2021 |
| Central Karate Academy CIC | Leamington Spa | 2024 |
| Central London Fencing Club Ltd | London | 2022 |
| Central Midlands Alliance League Limited | Derbyshire | 2024 |
| Central Music Library Limited(The) | London | 1947 |