| Cafe Seoul Ltd | Hospitality | 2025 |
| Caffe Marconi Ltd | Hospitality | 2022 |
| Caine TV Crews Limited | Information & communication | 1997 |
| Cairnworks Limited | Information & communication | 2026 |
| CAITL1N Limited | Extraterritorial | 2020 |
| Calamari 2025 Ltd | Financial services | 2025 |
| Caligo Ltd | Hospitality | 2015 |
| Call ME Copy Limited | Information & communication | 2011 |
| Callums Parcels Ltd | Transport & logistics | 2025 |
| CALV1N Limited | Wholesale & retail | 2021 |
| Calzac Legal Limited | Professional & scientific | 2024 |
| Camax UK Limited | Administrative & support | 1986 |
| Cameron Integrated Services Limited | Professional & scientific | 1996 |
| Cameron RAE Consultancy Limited | Professional & scientific | 2020 |
| Camilleri Appointments Ltd | Professional & scientific | 2019 |
| Camino Finance Limited | Professional & scientific | 2023 |
| Campbell Lamb UK Limited | Administrative & support | 2012 |
| Campervan Furniture Co (Harrogate) Limited | Manufacturing | 2025 |
| Camtek Limited | Financial services | 2022 |
| Candle Conferences Limited | Education | 2009 |
| Candour Consultancy Limited | Information & communication | 2014 |
| Canescrow Limited | Information & communication | 2025 |
| Canopy Healthcare Limited | Health & social care | 2025 |
| Canvas Homes Developments Limited | Construction | 2017 |
| Canvas Homes Tees Barrage Limited | Construction | 2020 |
| Canvas Homes Trinity Limited | Construction | 2024 |
| Capaldi Limited | Extraterritorial | 2025 |
| Capital United Limited | Extraterritorial | 2025 |
| Capitalg Ltd | Financial services | 2024 |
| Cappa Digital Ltd | Professional & scientific | 2020 |
| Cappuccino Cycling Club Limited | Arts & recreation | 2014 |
| Capretworks Ltd | Administrative & support | 2025 |
| Caprica Jersey (UK) Ltd | Administrative & support | 2023 |
| Capstone Property Partners Ltd | Real estate | 2026 |
| Captains Deck Limited | Real estate | 2021 |
| Car Import Solutions Limited | Wholesale & retail | 2022 |
| Car Valeting Harrogate Ltd | Administrative & support | 2024 |
| Cara A-Z Construction Ltd | Wholesale & retail | 2025 |
| Carantec Holdings Ltd | Financial services | 2026 |
| Carben Limited | Real estate | 2016 |
| Carbon Assessment Board Limited | Professional & scientific | 2021 |
| Carbon Offset Credits Limited | Extraterritorial | 2012 |
| Carbon Saver Consultancy Ltd | Professional & scientific | 2010 |
| Carbonell Limited | Wholesale & retail | 2024 |
| Carbonite Consulting Limited | Professional & scientific | 2020 |
| Carcharodon Limited | Professional & scientific | 2002 |
| Card Geotechnics Limited | Professional & scientific | 1994 |
| Card Wizard Limited | Manufacturing | 2021 |
| Cardale Freehold Limited | Extraterritorial | 2018 |
| Cardale Infrastructure Holdings Limited | Professional & scientific | 2014 |
| Cardale Infrastructure Investments Limited | Professional & scientific | 2012 |
| Cardale Nominees Limited | Financial services | 2003 |
| Cardale Park Properties Ltd | Real estate | 2004 |
| Cardale PFI Investments Limited | Professional & scientific | 2015 |
| Cardale Project Management Limited | Administrative & support | 2012 |
| Cardale Trustee Services Limited | Professional & scientific | 2009 |
| Cardamom Black Limited | Hospitality | 2010 |
| Cardinal Properties (Wetherby) Limited | Construction | 1994 |
| Care Designed for YOU Limited | Health & social care | 2018 |
| Care FEE Recovery Ltd | Professional & scientific | 2017 |
| Care Innovation (Nationwide) Limited | Information & communication | 2014 |
| Care Networx Ltd | Information & communication | 2022 |
| Careers Expert Group Ltd | Administrative & support | 2020 |
| Carefound Developments Limited | Construction | 2025 |
| Carefound Group Limited | Financial services | 2020 |
| Carefound Home Care (Harrogate) Limited | Health & social care | 2010 |
| Carefound Home Care (West Bridgford) Limited | Health & social care | 2020 |
| Carefound Home Care (Wilmslow) Limited | Health & social care | 2013 |
| Carefound Home Care (York) Limited | Health & social care | 2022 |
| Carelli Creative Ltd | Information & communication | 2013 |
| Carestaff IT Ltd | Information & communication | 2024 |
| Carey Design Studios Limited | Professional & scientific | 1988 |
| Caribbean Private Travel Limited | Administrative & support | 2017 |
| Carl Driver Limited | Transport & logistics | 2012 |
| Carling Deliveries Ltd | Transport & logistics | 2023 |
| Carlingo Ltd | Wholesale & retail | 2012 |
| Carlos Morais Services Ltd | Transport & logistics | 2026 |
| Carlos Rocha Transport Ltd | Transport & logistics | 2024 |
| Carlton Bayliss Limited | Extraterritorial | 2026 |
| Carlton Dene Management Services Company Limited | Households | 2017 |
| Carmaster (UK) Limited | Wholesale & retail | 2007 |
| Carnage Competitive Ltd | Arts & recreation | 2022 |
| Carobin Consulting Ltd | Professional & scientific | 2026 |
| Caroden Consultancy Ltd | Administrative & support | 2020 |
| Caroline the Sleep Consultant Limited | Administrative & support | 2019 |
| Caroline Woolley Coaching Ltd | Professional & scientific | 2024 |
| Caromatullo for Trade Ltd | Financial services | 2024 |
| Carraero Ltd | Manufacturing | 2026 |
| Carrbrown Properties Ltd | Hospitality | 2021 |
| Carrier Group Ltd | Real estate | 2019 |
| Carrington House Yorkshire Limited | Real estate | 2011 |
| Carter & Wood Accountants Ltd | Professional & scientific | 2023 |
| Carter Ashford Ltd | Real estate | 2018 |
| Carter Builders & Joiners Ltd | Construction | 2016 |
| Carter Design Studio Limited | Arts & recreation | 2013 |
| Carter Family Investments Limited | Real estate | 2016 |
| Carter Swan Limited | Extraterritorial | 2025 |
| Carter Voakes Ltd | Construction | 2024 |
| Cartier Classics Limited | Extraterritorial | 2011 |
| Cartotex Limited | Administrative & support | 2014 |