| Carmarthen Masonic Buildings Company Limited | Carmarthen | 1911 |
| Carmarthen Nails Ltd | Enfield | 2019 |
| Carmarthen Shopmobility Caerfyrddin | Carmarthen | 2010 |
| Carmarthenshire Construction Training Association Limited | Ammanford | 2008 |
| Carmarthenshire People First | Carmarthen | 2007 |
| Carmarthenshire Tourism Association | Ammanford | 1998 |
| Carmea Limited | Sandbach | 2025 |
| Carmel Funeral Services Limited | London | 1998 |
| Carmel Green Management Company Limited | Boston | 1983 |
| Carmel Rourke Ltd | Widnes | 2023 |
| Carmel Southend Limited | London | 1986 |
| Carmelas Hair Ltd | Omagh | 2024 |
| Carmeleni Ltd | London | 2025 |
| Carmelite Spirituality Network Ltd | Oxford | 2025 |
| Carmelo (Cambridge) Limited | Cambridge | 2012 |
| Carmelo Alessi Hairdressing Limited | Milton Keynes | 2008 |
| Carmelo's Head Start Ltd | Hertfordshire | 2002 |
| Carmen Nicole Ltd | Warrington | 2019 |
| Carmen Walker Ltd | Leamington Spa | 2023 |
| Carmen's Coaching Ltd | Wembley | 2025 |
| Carmen’S Hair and Beauty Ltd | Maidstone | 2023 |
| Carmichael Aviation Limited | Manningtree | 2023 |
| Carmichael Construction Limited | Motherwell | 2016 |
| Carmichael Consultants Limited | Edinburgh | 1997 |
| Carmichael Hair (UK) Ltd | London | 2019 |
| Carmichael Homes & Investments Ltd | Motherwell | 2017 |
| Carmichael Homes Construction Limited | Motherwell | 2016 |
| Carmichael Homes Scotland 2 Limited | Motherwell | 2020 |
| Carmichael Homes Scotland Limited | Motherwell | 2018 |
| Carmichael Offshore Mechanical Services Limited | Kilmarnock | 2024 |
| Carmine Consulting Ltd | Newbury | 2023 |
| Carmine Lake Limited | Warminster | 2015 |
| Carms London Limited | London | 2019 |
| Carn Car's Ltd | Helston | 2022 |
| Carn Ruadh Bhreac Limited | Nethy Bridge | 2007 |
| Carnaby 39 Ltd | Stonehaven | 2019 |
| Carnaby Street Group Ltd | London | 2019 |
| Carnage Events Limited | Greenock | 2019 |
| Carnage Productions Limited | London | 2014 |
| Carnatic Spa Limited | Liverpool | 2012 |
| Carnbee Taxis Ltd. | Edinburgh | 1999 |
| Carnegie Collective Limited | Shenley | 2025 |
| Carnegie Wealth Management Ltd | Dunfermline | 2017 |
| Carnelian Search Ltd | London | 2017 |
| Carnelias Ltd | Shipley | 2023 |
| Carnell & Hedge Ltd | Chesterfield | 2024 |
| Carnellan Art Ltd | London | 2025 |
| Carney & Co @Powercut Limited | Bargoed | 2025 |
| Carney Holdings Ltd | Liverpool | 2019 |
| Carnforth Community Swimming Pool Ltd | Lancaster | 2017 |
| Carnforth Masonic Hall Company Limited | Carnforth | 1975 |
| Carngrove Consulting Limited | Hinckley | 1998 |
| Carnie & Poole Hair and Beauty Limited | Cove Bay | 2020 |
| Carnival Marquees Ltd | Little Malvern | 2016 |
| Carnival of the Commons Ltd | Bicester | 2026 |
| Carnival POT Ltd | London | 2017 |
| Carnival Sign and Digital Limited | Taunton | 2022 |
| Carnivale International Events Ltd | Gateshead | 2017 |
| Carnivool Events & Productions Ltd | Hemel Hempstead | 2022 |
| Carnlea Tanning Limited | Ballymena | 2017 |
| Carnmeen Energy Limited | Newry | 2008 |
| Carnock Hutters Ltd | Edinburgh | 2021 |
| Carnoustie Community Development Trust Limited | Carnoustie | 2016 |
| Carnoustie Golf Links Limited | Perth | 2006 |
| Carnoustie Nail & Spa Ltd | Carnoustie | 2025 |
| Carnoustie Trading Co. Ltd. | Carnoustie | 2022 |
| Carnova Vehicle Solutions Ltd | Rotherham | 2024 |
| Carntyne Barbers Ltd | Glasgow | 2025 |
| Carnvale Ltd | Maidstone | 1995 |
| Carnwell Logistics Ltd | Stoke-On-Trent | 2022 |
| Carnyx Services Ltd | High Wycombe | 2024 |
| Caro Windmuller Limited | London | 2023 |
| Carob Ltd | London | 2015 |
| Caroben Enterprises Ltd | Stanley | 2026 |
| Carod Investments Limited | Hassocks | 2020 |
| Carol Barwick Limited | Newcastle Upon Tyne | 2014 |
| Carol Keeton Ltd. | Sheffield | 2010 |
| Carol Macniven Limited | Oban | 2021 |
| Carol Ogray Aesthetics and Wellbeing Ltd | London | 2025 |
| Carol Sadler Lighting Limited | Hampton | 2010 |
| Carol Straughan Hairdressing Limited | Bedford | 2017 |
| Carol Taylor Associates Limited | Belper | 2023 |
| Carol Visser Designs Limited | Nottingham | 2003 |
| Carol's Bonnie Dogs Limited | York | 2025 |
| Carol's Court Residents Association Limited | Torquay | 1989 |
| Carolan Coaching Limited | St. Albans | 2018 |
| Carolans Cleaning Services Limited | Norwich | 2010 |
| Carole ANN Rice Limited | London | 2016 |
| Carole Lacey Ltd | Kingsbridge | 2020 |
| Carole Stone Foundation | London | 2018 |
| Carole Wood Limited | Lincoln | 2022 |
| Carolina Blinds & Curtains (South West) Ltd | Tiverton | 2016 |
| Carolina Moura Ltd | London | 2023 |
| Carolina Shiribelli Ltd | Ilkley | 2023 |
| Caroline a Walsh Ltd | London | 2023 |
| Caroline Aesthetics Ltd | Chessington | 2022 |
| Caroline Alexander Consulting Limited | Bognor Regis | 2025 |
| Caroline Barnes Make-Up Limited | London | 2011 |
| Caroline Beauty Limited | London | 2021 |
| Caroline Benson Medical Ltd | Newry | 2023 |