| Casebase Technology Ltd | Information & communication | 2026 |
| Casework Services Community Interest Company | Professional & scientific | 2021 |
| Cashflow (Yorkshire) Limited | Professional & scientific | 2022 |
| Cashforcaravansuk Ltd | Wholesale & retail | 2026 |
| Casks & Corks Limited | Hospitality | 2016 |
| Cass Property Ltd | Construction | 2010 |
| Cassie Essentials Ltd | Manufacturing | 2025 |
| Casson Property Services Ltd | Construction | 2020 |
| Cast Events Limited | Hospitality | 2014 |
| Castiga Investments Ltd | Financial services | 2024 |
| Castillo Resturant Limited | Hospitality | 2025 |
| Castle 1 Limited | Professional & scientific | 2007 |
| Castle Access Scaffolding Services Ltd | Construction | 2022 |
| Castle Birkin Properties Ltd | Hospitality | 2022 |
| Castle Brookes Properties Tickhill Limited | Real estate | 2012 |
| Castle Creativity Ltd | Information & communication | 2018 |
| Castle Electrical & Security Solutions Ltd | Administrative & support | 2013 |
| Castle Fire Protection Services Ltd | Public administration | 2026 |
| Castle Hills Projects & Services Ltd | Real estate | 2024 |
| Castle Living Ltd | Real estate | 2025 |
| Castle Moat Holdings Limited | Real estate | 2019 |
| Castle Projects Ltd | Construction | 2019 |
| Castle Properties & Lettings Ltd | Real estate | 2022 |
| Castle Properties (Yorkshire) Ltd | Real estate | 2005 |
| Castle Steel Buildings Limited | Construction | 2017 |
| Castle View (Doncaster) Management Company Limited | Households | 2002 |
| Castle Windows & Conservatories Limited | Construction | 2002 |
| Castlefields (Phase 2) Management Company Limited | Households | 2005 |
| Castlegate DIY Limited | Wholesale & retail | 2011 |
| Castlepoint Leads Ltd | Professional & scientific | 2025 |
| Castlepub Ltd | Hospitality | 2025 |
| Castlewood Projects Ltd | Manufacturing | 2023 |
| Caswick Holdings Limited | Financial services | 2020 |
| Caswick Limited | Manufacturing | 1985 |
| Cat Zhao Limited | Wholesale & retail | 2023 |
| Cat-Maxx Ltd | Professional & scientific | 2014 |
| Cata Trans SA Ltd | Transport & logistics | 2018 |
| Cataleya Limited | Transport & logistics | 2020 |
| Cataleyatransport Ltd | Transport & logistics | 2018 |
| Catalin Sales Company Ltd | Wholesale & retail | 2020 |
| Catalyst Coaching and Consulting Ltd | Professional & scientific | 2021 |
| Catalyst Law Limited | Administrative & support | 2016 |
| Catalyst Solutions Group Consulting Limited | Professional & scientific | 2023 |
| Catalyst Solutions Group Limited | Real estate | 2016 |
| Catalyst Tulip Bidco Limited | Financial services | 2022 |
| Catalyst Tulip Midco Limited | Financial services | 2022 |
| Catch the Car Ltd | Information & communication | 2025 |
| Caterers Kitchen Limited | Professional & scientific | 1985 |
| Catering by Feast Limited | Hospitality | 2022 |
| Cathrine Dickinson Interior Design Ltd | Other services | 2012 |
| Cathy Gale Limited | Financial services | 2021 |
| Cathy Sutherland Jewellery Ltd | Manufacturing | 2025 |
| Catkin Clinical Psychology Limited | Health & social care | 2025 |
| Catley Family Holdings Limited | Financial services | 2025 |
| Catmet Ltd | Wholesale & retail | 2018 |
| Catpaul Property Ltd | Real estate | 2025 |
| Cattano Ltd | Administrative & support | 2007 |
| Cattells Community Care CIC | Health & social care | 2022 |
| Catton Electrical Services Limited | Construction | 2019 |
| Caul Homes Ltd | Real estate | 2026 |
| Causeway Property Ltd | Real estate | 2026 |
| Causier Financial Ltd | Professional & scientific | 2009 |
| Cauvin Properties Ltd | Real estate | 2020 |
| Cavendale Limited | Extraterritorial | 2026 |
| Cavendish Ember Ltd | Extraterritorial | 2026 |
| Cavendish House Private Nursery Ltd | Education | 2007 |
| Cavron Ltd | Wholesale & retail | 2026 |
| Cazzalini Consulting Ltd | Information & communication | 2015 |
| CB Aviation Services Ltd | Education | 2026 |
| CB Joinery Services Ltd | Construction | 2017 |
| CB Rendering Ltd | Construction | 2019 |
| CBC Investments Limited | Real estate | 2024 |
| CBD Haven Ltd | Wholesale & retail | 2025 |
| CBF Storage Solutions (Doncaster) Limited | Transport & logistics | 2016 |
| CBG Financial Planning Ltd | Professional & scientific | 2018 |
| CBR11 Ltd | Transport & logistics | 2019 |
| CBS Compact Business Solutions Ltd. | Financial services | 2014 |
| CBW Joinery Ltd | Construction | 2024 |
| Cbws (Doncaster) Limited | Construction | 2023 |
| CC Carpentry & Developments Ltd | Construction | 2026 |
| CC Martial Arts Ltd | Arts & recreation | 2018 |
| CC Property Maintenance Services Limited | Construction | 2014 |
| CC Rural Ltd | Agriculture & fishing | 2025 |
| Ccbs Latam Mena Region Office Ltd | Real estate | 2023 |
| Ccef Ltd | Construction | 2025 |
| CCJ 4 Limited | Information & communication | 2006 |
| CCM Actors' Agency Ltd | Administrative & support | 2025 |
| CCM Traders Ltd | Wholesale & retail | 2023 |
| Ccqs Construction Services Limited | Professional & scientific | 2025 |
| CCT Couriers Services Limited | Transport & logistics | 2023 |
| CD Driver Ltd | Wholesale & retail | 2017 |
| CD Publishing Ltd | Information & communication | 2021 |
| CDC Quality Transport Limited | Transport & logistics | 2023 |
| CDH Racing Ltd | Wholesale & retail | 2024 |
| Cdme Happy Family Limited | Hospitality | 2026 |
| CDR Trans Ltd | Transport & logistics | 2024 |
| CDS Yorkshire Ltd | Wholesale & retail | 2023 |
| CDT Trans Ltd | Transport & logistics | 2022 |
| CDV Serele Ltd | Transport & logistics | 2025 |
| Cedar & Finch Group Ltd | Extraterritorial | 2026 |