| Carmel London Limited | Reigate | 2014 |
| Carmeleon Concepts Ltd | Gosforth | 2012 |
| Carmelina Zerin Ltd | Waterlooville | 2023 |
| Carmella Patisserie Limited | Surbiton | 2022 |
| Carmels Fabrication Limited | Aylesbury | 2022 |
| Carmen Constantine Interiors Ltd | London | 2015 |
| Carmen Engineering Ltd | Derby | 2025 |
| Carmen Garden Audio Ltd | Hemsby | 2024 |
| Carmen Landscapes Ltd | Walton-On-Thames | 2026 |
| Carmen Nihat Ltd | Poole | 2017 |
| Carmenesa 369 Limited | Oxford | 2020 |
| Carmichael (Scotia) Limited | Dalkeith | 2009 |
| Carmichael Engineering Limited | Corby | 1977 |
| Carmichael Wholesale Global Limited | Huddersfield | 2022 |
| Carmine P&D Bakery Limited | Liverpool | 2019 |
| Carms (Trading) Limited | Birmingham | 2019 |
| Carn Metals Limited | Penzance | 1987 |
| Carn Plastics Limited | Lurgan | 2001 |
| Carn's Limited | London | 2002 |
| Carnaby AV Ltd | London | 2022 |
| Carnaby Caravans Limited | Carnaby, Bridlington | 1976 |
| Carnaby Gaming Machines Limited | Tring | 1997 |
| Carnaby Kitchen Ltd | London | 2020 |
| Carnaby Powder Coatings Limited | Beverley | 2002 |
| Carnaby World Ltd | Cardiff | 2025 |
| Carnaudmetalbox Engineering Limited | West Yorkshire | 1949 |
| Carnaudmetalbox Mec-A-Tec Services Limited | Shipley | 1988 |
| Carnegie James Ltd | London | 2024 |
| Carnegie Refrigeration Ltd | Cupar | 2024 |
| Carnehill Joinery Ltd | Cookstown | 2011 |
| Carneprod Limited | London | 2014 |
| Carney (UK) Ltd | Liverpool | 2014 |
| Carnforth Caravans & Transport Ltd | Blackpool | 2020 |
| Carnforth Print and Design Ltd | Carnforth | 2013 |
| Carnhill Transformers Limited | Kidlington | 1985 |
| Carnicas (Ireland) Limited | Co.Antrim | 1985 |
| Carniluxe (RAW) Ltd | Boston | 2018 |
| Carnival Coffee Roasters Ltd | London | 2019 |
| Carnival Fairgrounds Limited | Ferndown | 2016 |
| Carnivore Friendly Ltd | Abingdon | 2026 |
| Carnivoreengineering Ltd | Liverpool | 2026 |
| Carnmore Stone Limited | Enniskillen | 1996 |
| Carno Bedroom Kitchen Ltd | Uxbridge | 2023 |
| Carnot Consult Limited | Maidstone | 2013 |
| Carnyx Studios Ltd | Livingston | 2025 |
| Caro Jewels Ltd | London | 2021 |
| Caro Percy Ltd | Southampton | 2019 |
| Caroby Ltd | Huntingdon | 1996 |
| Carodon London Limited | London | 2024 |
| Carofine Limited | London | 2025 |
| Carol Alayne Ltd | London | 2008 |
| Carol C. Collections Limited | Newton Abbot | 2003 |
| Carol Cable Limited | Annesley | 2002 |
| Carol Rose Industries Ltd | London | 2019 |
| Carol's Stock Market Limited | Londonderry | 2018 |
| Carolina DE Barros Jewellery Ltd | London | 2019 |
| Caroline Andrew Limited | London | 2018 |
| Caroline Creba Fine Jewellery Ltd | Stourbridge | 2025 |
| Caroline Fallon Limited | Coventry | 2011 |
| Caroline Lily by the Sea Ltd | London | 2025 |
| Caroline Lita Limited | Fordingbridge | 2024 |
| Caroline Longden Limited | Leigh-On Sea | 2015 |
| Caroline Nall Curtains Limited | Derby | 2002 |
| Caroline Richardson Jewellery Ltd. | Chipping Campden | 2013 |
| Caroline Sales Limited | Nr Burnley | 1988 |
| Caroline York Limited | Wokingham | 2002 |
| Caroline's Cookies Ltd | London | 2025 |
| Carolinetabiti Atelier Ltd | Chatham | 2025 |
| Carolyn Codd Limited | Nottingham | 2002 |
| Carolyn DE LA Drapiere Limited | Wootton Bridge | 2002 |
| Carolynne Henry Voice & Production Limited | Glasgow | 2025 |
| Caromar Limited | Eastleigh | 2007 |
| Caromatherapy Ltd | Letchworth Garden City | 2023 |
| Caromba Jewellers Ltd | Weston-Super-Mare | 2019 |
| Caron Solutions International Limited | Hook | 1999 |
| Caronbell Limited | Coalville | 1965 |
| Carotenuto Ltd | London | 2018 |
| Carousel Equestrian Ltd | Lincoln | 2022 |
| Carousel Lights Limited | Boston | 2013 |
| Carousel Promotional Clothing UK Limited | Ipswich | 2012 |
| Carousel Soft Furnishings Limited | Darwen | 2016 |
| Carousel Windows Ltd | Bradford | 2012 |
| Carp Contract Services Ltd | Loughton | 2026 |
| Carp ENG Ltd | Treherbert | 2014 |
| Carpanini Carpentry Limited | Cardiff | 2026 |
| Carpathian Trade Ltd | Weston-Super-Mare | 2025 |
| Carpathian Vitality Ltd | Leigh | 2025 |
| Carpballs Ltd | Helston | 2025 |
| Carpe Design Manufacture Limited | St. Helens | 2021 |
| Carpe Diem Carpentry Ltd | Reading | 2025 |
| Carpenter & Paterson Limited | Welshpool | 1956 |
| Carpenter Engineered Foams Corby Limited | Glossop | 2022 |
| Carpenter Jose Ltd | London | 2023 |
| Carpenter Limited | Derbyshire | 1926 |
| Carpenter Oak Group Limited | Buckfastleigh | 2022 |
| Carpenter Oak Ltd | Buckfastleigh | 2000 |
| CARPENTER4YOU Ltd | Peterborough | 2026 |
| Carpenterra Ltd | Bolton | 2025 |
| Carpenters Choice Limited | London | 2024 |
| Carpenters Coventry UK Ltd | Coventry | 2026 |