| Caribiscus Ltd | Barking | 2019 |
| Caribou Campers Ltd | Wimborne | 2023 |
| Caric Press Limited | Merthyr Tydfil | 1991 |
| Caricom Limited | Nottingham | 2024 |
| Caricom Products Limited | Dartford | 2011 |
| Carillion Print Ltd | Bristol | 2022 |
| Carilor Ltd | Cardiff | 2019 |
| Carilume Limited | London | 2026 |
| Carina Kitchens & Bedrooms Limited | Merseyside | 1998 |
| Carinci Professional Services Ltd | Bedford | 2022 |
| Caring Boat Company Ltd | Cardiff | 2025 |
| Caring Caravaner Limited | Abergele | 2013 |
| Carisma Dance Shoe Limited | Leicester | 2002 |
| Carisma Printing Company Limited | Hainault | 2005 |
| Carith Ltd | Aberdeen | 2022 |
| Carkeys M25 Ltd | West Byfleet | 2021 |
| CARKEYS24 Ltd | Dunstable | 2022 |
| Carkus Solutions Ltd | Stourbridge | 2018 |
| Carl Bridger Ltd. | Newbury | 2011 |
| Carl Chinn Limited | Walsall | 1999 |
| Carl Grooby Electrical Services Ltd | Spalding | 2023 |
| Carl Gudgeon Engineering Ltd | Preston | 2019 |
| Carl Hutchins Limited | Oldham | 2016 |
| Carl In-Wood Company Ltd | Wakefield | 2020 |
| Carl Jones Electrical Limited | Uttoxeter | 2006 |
| Carl Jones Limited | Rhyl | 2013 |
| Carl Kearney Limited | Halifax | 2016 |
| Carl Lawrence Carpentry and Field Solutions Ltd | Solihull | 2025 |
| Carl Parker Steel Solutions Ltd | Retford | 2025 |
| Carl Stuart Tailors Limited | London | 2022 |
| Carl Zeiss Microscopy Limited | Cambourne | 1995 |
| Carl Zeiss Vision UK Limited | Birmingham | 1993 |
| Carla Perla Ltd | Manchester | 2025 |
| Carland Mill Limited | Dungannon | 2006 |
| Carleschi Ltd | Buckhurst Hill | 2023 |
| Carleton Autos Limited | Preston | 2012 |
| Carleton Autos Service Centre Ltd | Poulton-Le-Fylde | 2022 |
| Carleys of Cornwall Limited | Truro | 2000 |
| Carlhorder Limited | Lincoln | 2017 |
| Carlick Contract Furniture Limited | Manchester | 1973 |
| Carlie Creates Ltd | Hereford | 2022 |
| Carlile Aviation Services Ltd | Reigate | 2025 |
| Carlile Furniture Limited | Berkhamsted | 2005 |
| Carlin Electrical Services Ltd | Liverpool | 2024 |
| Carlin Performance Ltd | Alresford | 2021 |
| Carlines Jewellery Limited | Cardiff | 2002 |
| Carling Technologies Limited | Clyst Honiton | 1969 |
| Carlisle Concrete Supplies Limited | Carlisle | 2007 |
| Carlisle Furniture Limited | Carlisle | 2019 |
| Carlisle Refrigeration (Holdings) Limited | Carlisle | 2010 |
| Carlisle Refrigeration Limited | Carlisle | 1984 |
| Carlos Remes Limited | Northampton | 1973 |
| Carlot Robotics and Installation Limited | Walsall | 2024 |
| Carlotta's Cakes Ltd | Knaphill | 2024 |
| Carlow Field Services Ltd | Manchester | 2025 |
| Carlsberg Marston's Brewing Company Limited | Wolverhampton | 1903 |
| Carlsberg Marston's Limited | Wolverhampton | 2020 |
| Carlson Models Limited | Staines-Upon-Thames | 2016 |
| Carlsson 1064 Ltd | London | 2020 |
| Carlton Blinds (Cymru) Limited | Holyhead | 2004 |
| Carlton Blinds Limited | Redditch | 2002 |
| Carlton Bridge Limited | London | 2005 |
| Carlton Building Solutions Ltd | Newport | 2014 |
| Carlton Controls Limited | Waltham Abbey | 1989 |
| Carlton Design and Fabrication Limited | Nottingham Business Park | 2010 |
| Carlton Designs Limited | Gateshead | 2025 |
| Carlton Dewhirst Ltd. | Newcastle | 2017 |
| Carlton DIE Castings Limited | Paisley | 1983 |
| Carlton Group Biotechnology Limited | West Midlands, England | 2026 |
| Carlton Hydraulics Limited | Rotherham | 1989 |
| Carlton Industries UK Ltd | Newport | 2017 |
| Carlton Jewellery Company Limited | Birmingham | 1962 |
| Carlton Laser Services Limited | Leicester | 1980 |
| Carlton Luxury Beds Limited | Batley | 2019 |
| Carlton Main Brickworks Limited | Haywards Heath | 1950 |
| Carlton Manufacturing Ltd | Wythall | 2011 |
| Carlton Motor Sport Limited | Barnsley | 2014 |
| Carlton Power Developments NO: 15 Limited | Middlesbrough | 2024 |
| Carlton Power Developments NO: 16 Limited | Middlesbrough | 2024 |
| Carlton Power Developments NO: 18 Limited | Middlesbrough | 2024 |
| Carlton Power Developments NO: 19 Limited | Middlesbrough | 2024 |
| Carlton Print Management Limited | Oldham | 2011 |
| Carlton Shoes Limited | Essex | 1990 |
| Carlton Smith Limited | Pershore | 1989 |
| Carlton Smith Projects Limited | Worcestershire | 2003 |
| Carlton TX Limited | Nottingham | 2011 |
| Carlton Woodcraft Limited | Gravesend | 2011 |
| Carly Breame Ceramics Ltd | Elland | 2021 |
| Carlyle Construction Co. Ltd | Ratho | 2023 |
| Carlyle Creative Ltd | London | 2022 |
| Carlys Cookies Limited | Gloucester | 2024 |
| Carl’S Carpentry & Maintenance Service Ltd | Swansea | 2020 |
| Carm Precision Ltd | Mytchett | 2017 |
| Carmangerie Miruani Ltd | London | 2022 |
| Carmarthen HAM Ltd | Carmarthen | 2003 |
| Carmarthen Property Services Limited | Carmarthen | 2024 |
| Carmarthenshire Dairy Products Ltd | Carmarthen | 2018 |
| Carmel Clothing Limited | London | 1998 |
| Carmel Coffee Company Limited | Kirkliston | 2020 |
| Carmel Herbals Limited | Thurso | 1990 |