| Carleton House Preparatory School Limited | Education | 1976 |
| Carley Consultancy Ltd | Professional & scientific | 2025 |
| Carley Murphy Colour Doctor Ltd | Other services | 2019 |
| Carleyf Care Ltd | Health & social care | 2025 |
| Carlile Catering Ltd | Hospitality | 2025 |
| Carlin Electrical Services Ltd | Manufacturing | 2024 |
| Carlingwood Limited | Wholesale & retail | 1967 |
| Carlisha Solutions Ltd | Construction | 2018 |
| Carlos Trading Ltd | Wholesale & retail | 2019 |
| Carlton Court (Liverpool) Limited | Construction | 2016 |
| Carlton Court (Worthing) Ltd | Financial services | 2025 |
| Carlton Developments (NW) Limited | Construction | 2017 |
| Carlton European Limited | Professional & scientific | 2000 |
| Carlton Freight Limited | Administrative & support | 1994 |
| Carlton Global Logistics Limited | Transport & logistics | 2024 |
| Carlton Green Development Company Limited | Construction | 2019 |
| Carlton Green Property Holdings Limited | Real estate | 2019 |
| Carlyle Construction Limited | Extraterritorial | 2018 |
| Carlyle Decorators Limited | Wholesale & retail | 1995 |
| Carlyle UK Ltd | Construction | 2010 |
| Carmen Moore Ltd | Professional & scientific | 2017 |
| Carmine P&D Bakery Limited | Manufacturing | 2019 |
| Carnaby Investments Limited | Extraterritorial | 1957 |
| Carnatic Paraplanning Limited | Administrative & support | 2017 |
| Carnatic Spa Limited | Other services | 2012 |
| Carnegie Estates Ltd | Real estate | 2006 |
| Carney (UK) Ltd | Manufacturing | 2014 |
| Carney Holdings Ltd | Other services | 2019 |
| Carney Maintenance Limited | Construction | 2017 |
| Carney UK Holdings Ltd | Professional & scientific | 2022 |
| Carnivoreengineering Ltd | Manufacturing | 2026 |
| Caro Audley Street Limited | Professional & scientific | 2023 |
| Caro Bainbridge Ltd | Professional & scientific | 2021 |
| Caro Developments Baltic Limited | Extraterritorial | 2020 |
| Caro Developments Bridewell Limited | Real estate | 2016 |
| Caro Developments GS Limited | Extraterritorial | 2023 |
| Caro Developments Park View Limited | Real estate | 2019 |
| Caro Developments Poets Place Ltd | Construction | 2017 |
| Caro Developments Shaw Street Limited | Real estate | 2016 |
| Caro Developments VW Limited | Construction | 2020 |
| Caro Estates Limited | Real estate | 2015 |
| Caro Holdings Ltd | Financial services | 2019 |
| Caro Homes Limited | Real estate | 2015 |
| Caro Lettings Limited | Real estate | 2013 |
| Caro Sales and Lettings Limited | Extraterritorial | 2020 |
| Carol Moore Associates Limited | Health & social care | 2009 |
| Carol's Parts Limited | Wholesale & retail | 2026 |
| Caroline Mckenna Consultancy Limited | Health & social care | 2014 |
| Caroline Store Ltd | Wholesale & retail | 2026 |
| Carolines Beauty Salon Limited | Other services | 2014 |
| Carolyn Hughes PR Ltd | Professional & scientific | 2003 |
| Caropen Trading Limited | Professional & scientific | 2021 |
| Carouse Bar and Restaurant Ltd | Hospitality | 2021 |
| CARPARTS2GO Ltd | Wholesale & retail | 2024 |
| Carpe Care Ltd | Health & social care | 2025 |
| Carpe Diem Education Consultants UK Ltd | Education | 2023 |
| Carpenter Build Ltd | Construction | 2014 |
| Carpenter Design Limited | Real estate | 2020 |
| Carpenter Foundations Limited | Construction | 2022 |
| Carpenter Investments (Vine Street) Ltd | Real estate | 2012 |
| Carpenter Investments 1 Kings Dock Ltd | Real estate | 2016 |
| Carpenter Investments Brunswick Park 2 Ltd | Other services | 2011 |
| Carpenter Investments Brunswick Park Ltd | Real estate | 2001 |
| Carpenter Investments Brunswick Quay Limited | Construction | 2021 |
| Carpenter Investments Hawthorne Limited | Construction | 2016 |
| Carpenter Investments Ltd | Real estate | 2012 |
| Carpenter Investments Station Road Limited | Construction | 2017 |
| Carpenter Investments Stockport Ltd | Construction | 2016 |
| Carpenter Investments Vine Street B Limited | Real estate | 2017 |
| Carpenter Old Station Gardens Limited | Real estate | 2022 |
| Carpenter Projects Ltd | Construction | 2007 |
| Carpenters Defendant Services Limited | Professional & scientific | 2020 |
| Carpenters Holdings Limited | Financial services | 2012 |
| Carpenters Insurance Services Limited | Administrative & support | 2013 |
| Carpenters Limited | Professional & scientific | 2008 |
| Carpenters Resolver Limited | Financial services | 2018 |
| Carpet & Flooring Agencies Ltd | Administrative & support | 2019 |
| Carr & Associates LLP | | 2009 |
| Carr Catering Ltd | Hospitality | 2026 |
| Carr Electrical (UK) Ltd | Construction | 2017 |
| Carrick & Reid Property Management Limited | Households | 2024 |
| Carrick Vale Ltd | Professional & scientific | 2025 |
| Carriley Limited | Construction | 2025 |
| Carringtons Catering Ltd | Hospitality | 2003 |
| Carrisma Autobody Repairs Limited | Wholesale & retail | 2024 |
| Carroll Homes Partnership LLP | | 2024 |
| Carroll Plant Limited | Administrative & support | 1981 |
| Carroll Property Services Ltd | Construction | 2003 |
| Carrot Risk Technologies Limited | Financial services | 2011 |
| Carrs Billington Agriculture (Operations) Limited | Manufacturing | 1998 |
| Carrs Billington Agriculture (Properties) Limited | Professional & scientific | 1930 |
| Carruthers Property Ltd | Real estate | 2023 |
| Carry Fresh Ltd | Wholesale & retail | 2023 |
| Cars and Tours Ltd | Wholesale & retail | 2018 |
| Carson Electrical Contracting Ltd | Construction | 2016 |
| Carson Print Services Ltd | Manufacturing | 2000 |
| Carstoppage Ltd. | Administrative & support | 2025 |
| Cartakeback.Com Limited | Other services | 2002 |
| Carter Financial Consultancy Limited | Financial services | 2014 |
| Carter Morgan Properties Ltd | Real estate | 2022 |