| Carrith Limited | London | 2025 |
| Carro Step Print Limited | Colne | 2026 |
| Carroll & Meynell Transformers Limited | Stockton-On-Tees | 2005 |
| Carroll Contracts Ltd | London | 2026 |
| Carroll Electrical Limited | Ashford | 2015 |
| Carroll Noon Group Ltd | Nottingham | 2026 |
| Carroll's Glass Ltd | Dundonald | 2022 |
| Carroll-Turner Piano Services Ltd | Hove | 2003 |
| Carron Bathrooms Limited | Falkirk | 1982 |
| Carron Holdings Limited | Falkirk | 2000 |
| Carron Lodge Limited | Preston | 1996 |
| Carron Manufacturing Services Limited | Falkirk | 2015 |
| Carronhall Kitchens Ltd | Glasgow | 2022 |
| Carrooka Games Ltd | Leek | 2023 |
| Carrot Gold Ltd | Stowmarket | 2018 |
| Carrot Top Bakery Limited | Newport | 2021 |
| Carrs Billington Agriculture (Operations) Limited | Liverpool | 1998 |
| Carrs Billington Agriculture (Sales) Limited | Carlisle | 1923 |
| Carrs Coatings Limited | Redditch | 2008 |
| Carrs of Sheffield (Manufacturing) Limited | Holbrook, | 1981 |
| Carrs Paper Limited | Birmingham | 1953 |
| Carrs Pasties Limited | | 1975 |
| Carruthers Aerospace Ltd | Cambridge | 2017 |
| Carrwood Manufacturing Ltd | Widnes | 2020 |
| Carry on Blinds Limited | | 2007 |
| Carry on Costumes Limited | Christchurch | 2003 |
| Carry on Kiddie Ltd | London | 2026 |
| Carry on Knitting Ltd | Teignmouth | 2009 |
| Carry on Printing Ltd | Scarborough | 2020 |
| Carry Stones Limited | Cambridge | 2025 |
| Carry-On Products Ltd | Northampton | 2012 |
| Carryduff Building Supplies Limited | Belfast | 2006 |
| Carryduff Sawmills Ltd | | 2007 |
| Carrylicious Ltd | Fakenham | 2018 |
| Carrylift Group (Holdings) Limited | Skelmersdale | 1998 |
| Carrypour Drinkware Ltd | Kirkcaldy | 2026 |
| Cars 2 Ones Action Ltd | Barnstaple | 2025 |
| Cars and Commercial Servicing Ltd | Eversley Hook | 2022 |
| Cars by Cascoe Ltd | Beckenham | 2025 |
| Cars in Containers Limited | Heanor | 2007 |
| Cars International Heritage Limited | Rochford | 2016 |
| Carse Fabrications Ltd | Errol | 2020 |
| Carset Auto Co., Ltd | Romford | 2023 |
| Carshalton Repairs Limited | Carshalton Beeches | 2017 |
| Carsmetics (Bedford) Limited | Bedford | 2014 |
| Carsmetix Limited | Pershore | 2012 |
| Carsmith Midlands Ltd | Uttoxeter | 2022 |
| Carson Holdings Ltd | Peterborough | 2003 |
| Carson Print Services Ltd | Liverpool | 2000 |
| Carson Windows Ltd | Rochdale | 2025 |
| Cart Packs Ltd | London | 2025 |
| Cartaid Ltd | Cardiff | 2025 |
| Cartal Ltd | London | 2018 |
| Cartalia Roma Ltd | London | 2015 |
| Cartamundi (UK) Ltd | Basildon | 1991 |
| Carte Blanche 4 Ltd | London | 2022 |
| Carteen Limited | Ware | 2025 |
| Cartek Automotive Electronics Limited | Southampton | 2003 |
| Cartel Bakes Ltd | Beckenham | 2025 |
| Cartela International Ltd | Eastbourne | 2026 |
| Cartell UK Limited | Corby | 2008 |
| Carter & Mcarthur Limited | Faringdon | 2012 |
| Carter and Duck Blacksmiths Ltd | Stoneyhurst | 2022 |
| Carter Brothers (Rochdale) Ltd | London | 2025 |
| Carter Brothers International Limited | London | 2019 |
| Carter Business Systems Limited | Hessle | 1998 |
| Carter Ductwork Limited | Bucks | 2005 |
| Carter Electrical Services (Sussex) Ltd | Brighton | 2014 |
| Carter Electrical Solutions Limited | Syerston | 2016 |
| Carter Engineering Ltd | Ottery St. Mary | 2024 |
| Carter Fabrications Limited | Burnley | 1998 |
| Carter Group Limited | Basildon | 2017 |
| Carter Knowle IT Services Ltd | Sheffield | 2015 |
| Carter Laws Country Wear Ltd | London | 2025 |
| Carter Machinery Company Limited | Poulton-Le-Fylde | 2012 |
| Carter Marie Procurement Ltd | Newbury | 2021 |
| Carter Marine Services Ltd | London | 2026 |
| Carter Origin Limited | Rochdale | 1942 |
| Carter Retail Equipment Limited | Birmingham | 1959 |
| Carter Retail Ltd | Halifax | 2022 |
| Carter Savoy Limited | London | 2017 |
| Carter Security Limited | Basildon | 2010 |
| Carter Synergy Limited | Birmingham | 1921 |
| Carter Technical Mouldings Limited | Somerset | 2007 |
| Carter&Perendic Ltd | Woking | 2022 |
| Carter's END Ltd | Uxbridge | 2024 |
| Carter-Newlove Interiors Ltd | Ipswich | 2019 |
| Carter-Phoenix Ltd | Todmorden | 2022 |
| Carterdale (Paint Services) Ltd | Gloucester | 2020 |
| Carterdale Ltd. | Gloucester | 2010 |
| Carterhill Ltd | Shanklin | 2024 |
| Carters (2015) Limited | Sunderland | 2016 |
| Carters Bespoke Furniture Ltd | London | 2026 |
| Carters Cakes Limited | Morecambe | 2025 |
| Carters of Suffolk Limited | Witham | 2012 |
| Carters Scientific & General Trading Ltd | London | 1965 |
| Carter’S Wind Services Ltd | Blackpool | 2024 |
| Carthago Groups Ltd | Southport | 2024 |
| Carthouse Furniture Ltd | Thirsk | 2003 |
| Cartier Graphics Limited | Feltham | 2008 |