| Carousel for Hire Ltd | Glasgow | 2020 |
| Carousel FUN Limited | Stoke-On-Trent | 2012 |
| Carousel Holdco Limited | Otley | 2026 |
| Carousel in the Park Limited | Waltham Cross | 2021 |
| Carousel Project | Brighton | 1987 |
| Carousel Rides Limited | Nottingham | 2009 |
| Carousel UN Limited | London | 2025 |
| Carousels and Dreams Ltd | Bridlington | 2020 |
| CAROUSELS4EVENTS Ltd | Newry | 2017 |
| Carp & Coarse Fishing Holidays Limited | Hollinwood | 1999 |
| Carp Fishing Socials Ltd | Stevenage | 2026 |
| Carp King Competitions Ltd | Llanelli | 2026 |
| Carp Socials Limited | Preston | 2021 |
| Carpbond Limited | Cardiff | 2008 |
| Carpe Diem Ents Ltd | Frome | 2015 |
| Carpe Diem Motorsport Ltd | Pershore | 2019 |
| Carpe Diem Promotions Ltd | Harrow | 2019 |
| Carpe Diem Self Defence Limited | Fleet | 2011 |
| Carpe Noctum Limited | Teddington | 2006 |
| Carpenter's Daughter Limited | Brentwood | 2024 |
| Carpentour Ltd | Lancing | 2017 |
| Carpet Football Club Ltd | London | 2023 |
| Carpet Spoken Word Ltd | Milford Haven | 2019 |
| Carpetsforcaravans Limited | Bolton | 2015 |
| Carrabeanie Climbing Limited | Bracknell | 2021 |
| Carrcvt Ltd | London | 2026 |
| Carrczez Archives Ltd | London | 2025 |
| Carreglwyd Commercial Events Ltd | Chester | 2014 |
| Carriages Studio Ltd | Windlesham | 2025 |
| Carrick Performance Development Ltd | Durham | 2025 |
| Carrick Rangers Football Club Limited | Belfast | 2000 |
| Carrick Rangers Global Academy Limited | Belfast | 2024 |
| Carrick Sports Construction Limited | Glasgow | 2018 |
| Carrick Sports Limited | Barrow, Clitheroe | 2003 |
| Carrickfergus Amateur Rowing Club Incorporating Carrickfergus Sailing Club Limited | Carrickfergus | 2011 |
| Carrickfergus and District Motorcycle Club Limited | Larne | 2007 |
| Carrie Elks Publishing Ltd | London | 2021 |
| Carrie Watkins Ltd | Haverfordwest | 2019 |
| Carrie-Anne Ingrouille Limited | London | 2017 |
| Carrington Cleary Limited | London | 2013 |
| Carrington Gym and Wellness London Limited | London | 2021 |
| Carrington Riding Centre Limited | Manchester | 1999 |
| Carroll Creative Arts Limited | Canterbury | 2019 |
| Carrollfilm Limited | London | 2013 |
| Carrot in a BAG Ltd | Edinburgh | 2023 |
| Carrot Juice Limited | Leeds | 2002 |
| Carrot Personal Training Limited Limited | Maidenhead | 2014 |
| Carrot Productions Limited | Glossop | 2014 |
| Carrot.Run Ltd | Dorking | 2020 |
| Carrotcake Limited | Buntingford | 2006 |
| Carrow House Creatives CIC | Norwich | 2024 |
| Carrowdore Shooting Club Ltd | Newtownards | 2012 |
| Carruthers and Hobbs Design Limited | Chelmsford | 2005 |
| Carry on Entertaining Limited | Scarborough | 2025 |
| Carré Art Ltd | Hook Norton | 2020 |
| Cars & Cuppas Ltd | Exeter | 2024 |
| Cars, Kinetics and Construction Ltd | Dover | 2023 |
| Carsden UK Trucks Limited | Leeds | 2017 |
| Carshalton Athletic F.C. Limited | Carshalton | 2004 |
| Carsick Ltd | Salisbury | 2026 |
| Carsington Sports & Leisure Limited | Milton Keynes | 1992 |
| Carson Health & Fitness Ltd | Corby | 2014 |
| Carson Roberts Ltd | London | 2017 |
| Carson's Bistro Limited | Bridlington | 2025 |
| Carsons Events Ltd | Birmingham | 2022 |
| Carswell Country Club Limited | Witney | 2000 |
| Carte Blanche Events Ltd | London | 2025 |
| Carte Blanche Production Ltd | London | 2019 |
| Carte Blanche Ventures Ltd | Princes Risborough | 2008 |
| Carteblanchemusique Limited | London | 2025 |
| Cartel Events Ltd | Nantwich | 2025 |
| Carten 100 Limited | Cardiff | 2012 |
| Carter & Bailey Limited | St. Albans | 1962 |
| Carter and West Ltd | Shavington | 2018 |
| Carter Blyth Ltd | Bowness On Windermere | 2025 |
| Carter Design Studio Limited | Harrogate | 2013 |
| Carter Dixon Mcgill Ltd | Darlington | 2022 |
| Carter Equestrian Limited | Beverley | 2019 |
| Carter Productions and Co Ltd | Barking | 2024 |
| Carter Sporting Club Limited | Wisbech | 2024 |
| Carter-Thynne Productions Ltd | Rugby | 2022 |
| Carterfun Ltd | Bath | 2024 |
| Carters Entertainment Limited | London | 2001 |
| Carters Lane Ltd | London | 2025 |
| Carterton Community Centre | Carterton | 2008 |
| Carterton Football Club C.I.C. | Carterton | 2018 |
| Carterton Gymnastic Club CIC | Carterton | 2018 |
| Carterz Events Ltd | Maidenhead | 2026 |
| Carthage Touring (UK) Limited | Southwark | 2001 |
| Carthusia Limited | London | 2011 |
| Cartmel Agricultural Society | Milnthorpe | 1987 |
| Cartmel Steeplechases (Holker) Limited | Kirkby-In-Furness | 1998 |
| Cartmel Steeplechases Limited | Cumbria | 1925 |
| Cartmell Tennis Coaching Ltd | Macclesfield | 2025 |
| Cartoon Art Trust Limited | London | 1988 |
| Cartoons R FUN Limited | Surrey | 1991 |
| Cartridge Atelier Ltd | High Wycombe | 2023 |
| Cartridges and Clays Limited | Lanark | 2022 |
| Cartwheelers Gymnastics Limited | Newport | 2023 |
| Cartwright Inspired Ltd | Cheltenham | 2025 |