| CTB Enterprises Ltd | London | 2019 |
| CTC College Ltd | Needham Market | 2019 |
| CTC Fitness Southport Limited | Southport | 2018 |
| CTD Events Ltd | Gloucester | 2024 |
| CTD Racing Ltd | Cheltenham | 2022 |
| CTE Theatricals Limited | London | 2024 |
| Ctfc 2017 Limited | Cleethorpes | 2017 |
| CTG Boxing Ltd | Hertford | 2021 |
| CTG Fitness Limited | Dartford | 2023 |
| Cthrurecords Ltd | London | 2025 |
| Cthulhu Ltd | Worthing | 2022 |
| CTI Concerts Ltd | Ongar | 2024 |
| CTN Pro UK Limited | Whitstable | 2026 |
| Ctperformancecoaching Ltd | Blackpool | 2025 |
| Ctrl ALT Elite London Ltd | London | 2025 |
| Ctrl ALT Sports Ltd | Manchester | 2025 |
| Ctrl Esports Ltd | Wimborne | 2023 |
| Ctrl Holdings Ltd | London | 2025 |
| Ctrl Music Limited | Abingdon | 2018 |
| Ctrl+Create CIC | London | 2025 |
| Ctrl-Art Studios Limited | Bexhill-On-Sea | 2025 |
| Ctrl-D Ltd | Stafford | 2015 |
| Ctrlaltplayuk Ltd | Ipswich | 2026 |
| Ctrlaltrepeat Ltd | London | 2020 |
| Ctrlfrk Limited | London | 2017 |
| CTS Motorsport Ltd | Gainsborough | 2016 |
| CTS Technical Services Limited | Bradford | 1994 |
| CTU Consulting Ltd | London | 2007 |
| CTV M3DIA Ltd | Welling | 2024 |
| CTW Pump Room CIC | Tunbridge Wells | 2025 |
| CTY AD CIC | Bury St. Edmunds | 2026 |
| CU2 Limited | Swindon | 2002 |
| Cuan Design Limited | Inverurie | 2005 |
| CUB Hub Ltd | Elland | 2026 |
| CUB Ilminster Ltd | London | 2024 |
| Cubair Flight Training Limited | Redhill | 1996 |
| Cubbins Leisure Ltd | Bolton | 2016 |
| Cube Coaching Limited | Hampton | 2022 |
| Cube Fitness Limited | London | 2018 |
| Cube International Ltd | Worcester | 2019 |
| Cube Music Space Limited | Nottingham | 2021 |
| Cube Room Productions Limited | Edgware | 2018 |
| Cube Sport Limited | Hook | 2021 |
| Cubeevents Limited | London | 2018 |
| Cubic Feet Ltd | London | 2016 |
| Cubiqdesign Limited | Newmarket | 2008 |
| Cubone Ltd | Nottingham | 2015 |
| Cubra Limited | Farnham | 2014 |
| CUC758 Football Ltd | Chadwell Health | 2021 |
| Cuchi-Pa Limited | Blyth | 2022 |
| Cuckfield Bookfest Community Interest Company | Haywards Heath | 2019 |
| Cuckfield Golf Centre Limited | Haywards Heath | 2018 |
| Cuckfield Lawn Tennis Club Ltd | Haywards Heath | 2014 |
| Cuckoo Bang Ltd. | London | 2015 |
| Cuckoo Farm Studios Limited | Colchester | 2008 |
| Cuckoo Fayre Limited | Eastbourne | 1991 |
| Cuckoo Partnership Limited | London | 2025 |
| Cuckoo's Nest Limited | London | 2026 |
| Cucucachoo Events Ltd | London | 2022 |
| Cuddington (Banstead) Golf Club Limited | Surrey | 1927 |
| Cudh Ltd | Huntingdon | 2023 |
| Cudham Sports Association Ltd | West Wickham | 2014 |
| Cudmore & Co Limited | Bewdley | 2003 |
| CUE & Brew Limited | Kidderminster | 2010 |
| CUE - SD Limited | Braintree | 2003 |
| CUE Above the Rest Limited | Hoddesdon | 1985 |
| CUE Ball Bradford Limited | Bradford | 2025 |
| CUE Club 147 Limited | Manchester | 2026 |
| CUE Club Bradford Ltd | Bradford | 2023 |
| CUE Gardens Limited | Bradford | 2013 |
| CUE Haven Snooker Ltd | Bradford | 2024 |
| CUE Masters UK Limited | Witham | 2016 |
| CUE Moves Ltd | London | 2023 |
| CUE Presents Ltd | Newport | 2025 |
| CUE Sports Facilities Limited | London | 2025 |
| CUE Star Academy Ltd | Solihull | 2025 |
| CUE the Light Academy Ltd | Wembley | 2025 |
| CUE the Music Limited | Swansea | 2007 |
| Cue'D UP Ltd | Saltcoats | 2026 |
| CUE147LOUNGE Ltd | Bradford | 2022 |
| CUE34 Theatre Company Ltd | Amersham | 2021 |
| CUE7 Snooker Ltd | Lytham St. Annes | 2026 |
| Cueball (Derby) Limited | Derby | 2012 |
| Cueball Ltd | Bradford | 2021 |
| Cuedini Ltd | Liverpool | 2026 |
| Cuelight Productions Ltd | Thames Ditton | 2026 |
| Cuemasterz Ltd | Accrington | 2025 |
| Cuepointbolton Limited | Bolton | 2025 |
| Cues Pool & Snooker Club Limited | London | 2002 |
| Cuesports and Darts East CIC | Swaffham | 2025 |
| Cuetips Media Limited | Widnes | 2023 |
| Cuetopia Ltd | Kettering | 2022 |
| Cuilcagh and Co UK Limited | Manchester | 2022 |
| Cuillin Competitions Ltd | Portree | 2021 |
| Cuillin Sound Music | Nottingham | 2015 |
| Cukrun Limited | London | 2017 |
| Culford School (Trading Trust) Limited | Suffolk | 1979 |
| Cullender Services Limited | London | 2018 |
| Cullompton Cricket & Recreational Club Limited | Exeter | 2025 |
| Culloville Development Association | Newry | 2011 |