| Cabatt Ltd | Education | 2021 |
| Cabritunes Ltd. | Information & communication | 1998 |
| Cadancia Studio Ltd | Information & communication | 2025 |
| Cadeso Ltd | Construction | 1997 |
| Cadno Consulting Limited | Professional & scientific | 2023 |
| Caesura Services Ltd | Professional & scientific | 2021 |
| Caesura Ventures Limited | Information & communication | 2014 |
| Caid Construction Ltd | Construction | 2018 |
| Calestio Ltd | Construction | 2024 |
| Calgoz Limited | Wholesale & retail | 2014 |
| Calgoz Properties Limited | Real estate | 2020 |
| Calips Ltd | Wholesale & retail | 2020 |
| Cally 71 Ltd | Professional & scientific | 2022 |
| Calton Development Limited | Construction | 2020 |
| Cambridge Blue Ventures Ltd | Professional & scientific | 2013 |
| Cameleo UK Ltd | Construction | 2026 |
| Campers With Hampers Limited | Administrative & support | 2023 |
| Campion House Limited | Households | 2014 |
| CAN I GET a Watt Watt Lighting Limited | Information & communication | 2010 |
| Cancerbae CIC | Health & social care | 2024 |
| Cancerbae Global Limited | Administrative & support | 2025 |
| Cane Global Limited | Financial services | 2026 |
| Capreae Ltd | Information & communication | 2022 |
| Capri Foods Limited | Manufacturing | 1983 |
| Capstone International Properties Limited | Real estate | 2009 |
| Car Care Express Limited | Wholesale & retail | 2014 |
| Car Connect London Ltd | Wholesale & retail | 2023 |
| Carbyneprotection Limited | Administrative & support | 2013 |
| Carcare LM Ltd | Administrative & support | 2011 |
| Cardinal Ventures Ltd | Hospitality | 2024 |
| Care Education Ltd | Administrative & support | 2015 |
| Career Bay Consulting UK Ltd | Administrative & support | 2014 |
| Cargo Runway Ltd | Transport & logistics | 2026 |
| Caroline Close Osterley Residents Association Limited | Households | 1984 |
| Caroscuro Limited | Real estate | 2024 |
| Cartflow Retail Ltd | Wholesale & retail | 2026 |
| Casa LE Calma Ltd | Information & communication | 2026 |
| Cassiel Properties Ltd | Real estate | 2025 |
| Castalla Consulting Limited | Professional & scientific | 2025 |
| Castleford Lumley Development Limited | Construction | 2024 |
| Cata&Anca Trans Ltd | Transport & logistics | 2018 |
| Catscooters Ltd | Administrative & support | 2025 |
| Cavendish Personnel Limited | Professional & scientific | 1984 |
| Cbede Services Ltd | Information & communication | 2015 |
| CBM Holdco Limited | Real estate | 2019 |
| CBM Propco Limited | Real estate | 2019 |
| CCA Driving Ltd | Transport & logistics | 2018 |
| Ccrtm | Households | 2011 |
| CDA 1 Limited | Construction | 2026 |
| Celebrationz Limited | Arts & recreation | 2004 |
| Celestial Buddies Ltd | Wholesale & retail | 2022 |
| Celestial Gold Limited | Arts & recreation | 2012 |
| Cellfservices Ltd | Information & communication | 2012 |
| Cena Holdings Ltd | Financial services | 2023 |
| Cense Limited | Professional & scientific | 2022 |
| Centella Systems Limited | Information & communication | 2002 |
| Central Tandoori Limited | Hospitality | 2023 |
| Ceylon Home Ltd | Hospitality | 2026 |
| CEZ Trading Ltd | Wholesale & retail | 2023 |
| Cfdjpd Ltd | Real estate | 2021 |
| CG (P&D) Limited | Construction | 2021 |
| Chadwick Studios Limited | Arts & recreation | 2025 |
| Chai and Chai Limited | Real estate | 1995 |
| Chalk Farm Road 87 Ltd | Real estate | 2021 |
| Challenge Chasers Limited | Professional & scientific | 2026 |
| Chantal Avance Ltd | Manufacturing | 2022 |
| Chantilly Productions Ltd | Information & communication | 2026 |
| Chapelcroft Contracts Ltd | Construction | 2026 |
| Charania Investments Limited | Real estate | 2018 |
| Charbon Luxe Limited | Wholesale & retail | 2025 |
| Charcoal Lebanese Grill Ltd | Hospitality | 2020 |
| Charismashape Care Ltd | Health & social care | 2022 |
| Charmaine Roberts Ltd | Arts & recreation | 2021 |
| Charolais Properties Limited | Real estate | 2022 |
| Chatfield Investments Limited | Real estate | 2024 |
| Chavez Transport Limited | Transport & logistics | 2021 |
| CHEFRHYS43 Limited | Hospitality | 2019 |
| Chefsperhour Limited | Administrative & support | 2016 |
| Chennai Kitchen Ltd | Hospitality | 2019 |
| Chequers Transport (Bedford) Ltd | Transport & logistics | 2007 |
| Cherry Tree Therapy Ltd | Health & social care | 2018 |
| Chester Films Productions Ltd | Information & communication | 2024 |
| Chevron Investments Limited | Real estate | 2018 |
| CHI Events Ltd | Hospitality | 2016 |
| China UK Medical Exchange Limited | Health & social care | 2015 |
| China WOK Plus Ltd | Hospitality | 2024 |
| Chips Oman Distribution Ltd | Extraterritorial | 2019 |
| Chiri Studio Ltd | Information & communication | 2025 |
| Chondell Properties Limited | Households | 1983 |
| Choudhary Sons Ltd | Wholesale & retail | 2023 |
| Chowdhary & Co (Morden) Limited | Professional & scientific | 2011 |
| Chowdhary & Co Ltd | Administrative & support | 2017 |
| Chowdharyandco Ltd | Extraterritorial | 2020 |
| Christian Addlestone Ltd | Transport & logistics | 2022 |
| Christopher Magennis Consulting Limited | Professional & scientific | 2025 |
| Church Street Freehold Limited | Real estate | 2025 |
| Ciconia Travels Ltd | Administrative & support | 2024 |
| Ciel Bleu 6 Limited | Professional & scientific | 2012 |
| Cinemania Limited | Information & communication | 2020 |
| Cinqo Limited | Real estate | 2020 |