| Care and Empowerment Ltd | Health & social care | 2025 |
| Care Connect Consulation Ltd | Professional & scientific | 2025 |
| Care Esteem Limited | Information & communication | 2023 |
| Care Online Limited | Health & social care | 2025 |
| Care Services 247 Ltd | Public administration | 2022 |
| Carebee Private Ltd | Administrative & support | 2025 |
| Careden Limited | Health & social care | 2025 |
| Caredo Ltd | Health & social care | 2023 |
| Caredo Security Services Group Ltd | Administrative & support | 2023 |
| Carefoot Holdco Limited | Financial services | 2025 |
| Carefoot PLC | Professional & scientific | 1992 |
| Carefoot Properties Holdco Limited | Financial services | 2026 |
| Carehearts Ltd | Health & social care | 2019 |
| Careicon (IP) Limited | Extraterritorial | 2014 |
| Careicon Foundation Limited | Extraterritorial | 2014 |
| Careicon Global Foundation Limited | Extraterritorial | 2015 |
| Careicon Limited | Extraterritorial | 2014 |
| Carelife Carers for YOU Ltd | Administrative & support | 2026 |
| Carelovelearnchildcare Limited | Health & social care | 2019 |
| Caremax 24/7 UK Ltd | Health & social care | 2022 |
| Carepath Recruitment Limited | Administrative & support | 2009 |
| Carestaff Group Limited | Administrative & support | 2016 |
| Carestaff Solutions Limited | Administrative & support | 2010 |
| Carey Childcare Centre | Education | 2012 |
| Carey Events Limited | Arts & recreation | 2025 |
| Carford Garage Ltd | Wholesale & retail | 2012 |
| Cargo Movers Holdings Limited | Financial services | 2023 |
| Cargo Movers Logistics Limited | Transport & logistics | 2023 |
| Caring 4 Croydon Holdings Limited | Professional & scientific | 2006 |
| Caring 4 Croydon Limited | Health & social care | 2006 |
| Caring Conversations Counselling Services Ltd | Health & social care | 2021 |
| Caring Heart Healthcare Limited | Health & social care | 2025 |
| Caring Pathways Ltd | Professional & scientific | 2024 |
| Caritas AID and Support | Education | 2018 |
| Carl Duckworth Transport Ltd | Transport & logistics | 2022 |
| Carl Foley (Plumbing & Heating) Limited | Construction | 2003 |
| Carl Gudgeon Engineering Ltd | Manufacturing | 2019 |
| Carl Hague Limited | Financial services | 2020 |
| Carl Philips Limited | Administrative & support | 2015 |
| Carla's Bags Limited | Wholesale & retail | 2022 |
| Carleton Autos Limited | Manufacturing | 2012 |
| Carleton Project Services Ltd | Professional & scientific | 2024 |
| Carlo Breen Limited | Other services | 2025 |
| Carlton Contracts (Ceilings & Partitions) Limited | Construction | 2011 |
| Carlton Contracts Ltd | Construction | 1989 |
| Carlton Court Flat Management Limited | Households | 1986 |
| Carmin Consulting Ltd | Financial services | 2025 |
| Carnoa Ltd | Hospitality | 2019 |
| Carol Maynard Podiatry Ltd | Health & social care | 2008 |
| Caroline April Ltd | Agriculture & fishing | 2019 |
| Caroline Hill Nutrition Ltd | Health & social care | 2025 |
| Caroline's Properties Ltd | Hospitality | 2025 |
| Carousel Enterprises Limited | Real estate | 2013 |
| Carp Global Fishing Ltd | Wholesale & retail | 2018 |
| Carp Socials Limited | Arts & recreation | 2021 |
| Carpet and Flooring Solutions Limited | Wholesale & retail | 2004 |
| Carpet Emporium (NW) Ltd | Other services | 2013 |
| CARPETCLEARANCE4U Limited | Extraterritorial | 2021 |
| Carpets Direct & Furniture Limited | Wholesale & retail | 1997 |
| Carrera Finance (NW) Limited | Financial services | 2003 |
| Carreta Limited | Real estate | 2015 |
| Carrhey Horticultural Ltd | Agriculture & fishing | 2003 |
| Carrigan Plumbing & Heating Ltd | Construction | 2021 |
| Carron Lodge Limited | Manufacturing | 1996 |
| Carrot Mops Creations Limited | Wholesale & retail | 2024 |
| Cars Direct North West Ltd | Wholesale & retail | 2003 |
| Carsley Landscapes Ltd | Administrative & support | 2020 |
| Cartco Consulting Ltd | Financial services | 2024 |
| Carter & Allen Associates Ltd | Information & communication | 2003 |
| Carter and Co Tax Consultancy Limited | Professional & scientific | 2024 |
| Carter Building Consultancy Ltd | Construction | 2017 |
| Carter's Building Consultancy Ltd | Construction | 2016 |
| Carter's Creative Outdoors Limited | Administrative & support | 2002 |
| Carters Developments Limited | Construction | 2019 |
| Cartex Diagnostics Limited | Wholesale & retail | 2011 |
| Cartmell & Barlow Limited | Other services | 1998 |
| Cartmell Buildings Ltd | Construction | 2021 |
| Cartridge Property Ltd | Real estate | 2024 |
| Caryal Limited | Construction | 2026 |
| Casa Christina Properties Limited | Real estate | 2016 |
| Casa DI Vinile Ltd | Construction | 2019 |
| Casa Sueno Limited | Professional & scientific | 2017 |
| Case Consulting Limited | Professional & scientific | 2010 |
| Casey Digital Ltd | Information & communication | 2019 |
| Casey’S Castles and Event Hire Ltd | Arts & recreation | 2022 |
| Casfs Ltd | Financial services | 1989 |
| Cashel Civils Limited | Construction | 2013 |
| Cask ALE Solutions Ltd | Administrative & support | 2014 |
| Cask and Craft Limited | Hospitality | 2015 |
| Caslpts Ltd | Financial services | 1980 |
| Cass Rentals Ltd | Real estate | 2019 |
| Cassidy (UK) Ltd | Construction | 2006 |
| Casson Investments Limited | Financial services | 2024 |
| Castle Contractors NW Ltd | Construction | 2019 |
| Castle Estates and Property Services Ltd | Real estate | 2021 |
| Castle Homes Estates and Property Services Limited | Real estate | 2023 |
| Castle Key Ltd | Real estate | 2018 |
| Castle Tax Solutions Ltd | Professional & scientific | 2018 |
| Castle Vale Management Company Limited | Households | 1997 |
| Castlehomes Estate Agents Ltd | Real estate | 2021 |