| Capsul Ltd | Professional & scientific | 2020 |
| Capulet Square RTM Company Limited | Households | 2014 |
| Capvale Limited | | 1986 |
| Car Maintenance Club Ltd | Wholesale & retail | 2026 |
| Card Omniverse Ltd | Wholesale & retail | 2023 |
| Care & Consulting Ltd | Health & social care | 2026 |
| Care Package Plus Limited | Health & social care | 2024 |
| Cargo Crafters Limited | Transport & logistics | 2020 |
| Carl Fredrik Ltd | Information & communication | 2021 |
| Carlo Moretto Limited | Wholesale & retail | 2023 |
| Carlton House Developments Limited | Construction | 2016 |
| Carlton London Limited | Extraterritorial | 2025 |
| Caroline Downes Interior Design Ltd | Professional & scientific | 2022 |
| Carp Contract Services Ltd | Manufacturing | 2026 |
| Carpenters Arms Limited | Hospitality | 2025 |
| Carrera Media Ltd | Real estate | 2025 |
| Carrington Chase Limited | Real estate | 2025 |
| Carters Glass Company Limited | Wholesale & retail | 1965 |
| Cartom Ltd | Transport & logistics | 2016 |
| Caruana & Sons Limited | Construction | 2018 |
| Casa 68 Limited | Construction | 2026 |
| Casa Crest Ltd | Real estate | 2023 |
| Casa Sicilia Limited | Hospitality | 2025 |
| Casburn Wayman Communications Limited | Professional & scientific | 1994 |
| Cassea Bistro Limited | Hospitality | 2024 |
| Cassea Loughton Ltd | Hospitality | 2026 |
| Castillo Holdco Limited | Financial services | 2020 |
| Castillo Limited | Administrative & support | 1999 |
| Castle Tandoori Ltd | Hospitality | 2019 |
| Castleview Systems Limited | Construction | 2012 |
| Cathard Investments Limited | Real estate | 2016 |
| Cavendish 7 Poland Street Ltd | Real estate | 2026 |
| Cavendish Estate Agencies Limited | Real estate | 1971 |
| Cavendish Estates Holdings Limited | Professional & scientific | 2002 |
| Cavendish Incorporated Ltd | Professional & scientific | 2019 |
| Cavus 68 Limited | Hospitality | 2025 |
| Caxton Works Developments Limited | Construction | 2013 |
| CB Collier Investments Ltd | Real estate | 2023 |
| CB Collier ROW Limited | Education | 2013 |
| CB Collier ROW Properties Ltd | Real estate | 2020 |
| CBS Golf Limited | Arts & recreation | 2014 |
| CBS Maintenance Limited | Construction | 2023 |
| CCE Investments Holdings Ltd | Financial services | 2025 |
| CCE Property Investments Ltd | Real estate | 2025 |
| Ccholdco Limited | Financial services | 2026 |
| CD Pharma Limited | Professional & scientific | 2001 |
| CDF Property Management Ltd | Real estate | 2017 |
| Cedarcube Family Limited | Health & social care | 2019 |
| Celavida Ltd | Professional & scientific | 2022 |
| Celik Demir Ltd | Hospitality | 2025 |
| Cellica Limited | Real estate | 1999 |
| Cempa Clothing Limited | Wholesale & retail | 2023 |
| Central & City Limousines Limited | Transport & logistics | 2013 |
| Central Court Management (Chigwell) Limited | Households | 2006 |
| Central Living (Exeter) Limited | Hospitality | 2020 |
| Central London Inns Limited | Hospitality | 2014 |
| CEO Chauffeurs of London Limited | Transport & logistics | 2018 |
| Ceren Software & Consultancy Ltd | Information & communication | 2017 |
| Ceres Productions Ltd | Information & communication | 2012 |
| Certified Smart Repairs Ltd | Wholesale & retail | 2019 |
| Certo Interiors Ltd | Other services | 2021 |
| Ceylan Insel Ltd | Wholesale & retail | 2016 |
| CF Trading (London) Ltd | Other services | 2020 |
| CFS Consulting Services Ltd | Administrative & support | 2024 |
| CFS Fashion Ltd | Wholesale & retail | 2010 |
| CG Freehold Limited | Households | 2003 |
| Chadwin Road Management Company Limited | Households | 1991 |
| Chaego Training Limited | Education | 2021 |
| Chagal Investments Limited | Real estate | 2019 |
| Chagal Properties CS Ltd | Real estate | 2020 |
| Chagal Properties ET Ltd | Administrative & support | 2020 |
| Chagal Publishing Limited | Information & communication | 2024 |
| Chain Reaction Jewellers Ltd | Wholesale & retail | 2022 |
| Chalcot Square Limited | Households | 1989 |
| Chalfont ST Peter Developments Limited | Real estate | 2022 |
| Chalfont ST Peter Residential Limited | Financial services | 2025 |
| Champar Point Ltd | Information & communication | 2024 |
| Chana Bros Ltd | Real estate | 1998 |
| Chantal Rosenbaum Foundation | Professional & scientific | 2010 |
| Chantilly (Brentwood) Ltd | Hospitality | 2022 |
| Chapman Resourcing Ltd | Professional & scientific | 2019 |
| Charlie Browns Barbers Limited | Other services | 2012 |
| Charlie Gardens Limited | Administrative & support | 2024 |
| Charlie Maddison Business Consultancy Limited | Information & communication | 2016 |
| Charlie Maddison Property Investments Limited | Real estate | 2017 |
| Charlie Nabbs Limited | Professional & scientific | 2018 |
| Charlie Properties Limited | Construction | 1982 |
| Charman & Charman Properties Limited | Real estate | 2023 |
| Charman and Mardell Properties Ltd | Real estate | 2023 |
| Charmas Stage School CIC | Arts & recreation | 2023 |
| Charne Design Systems Limited | Information & communication | 2002 |
| Chase Building Contractors UK Limited | Construction | 2020 |
| Chase Factory Ltd | Wholesale & retail | 2025 |
| Chauffeur Centre Ltd | Transport & logistics | 2010 |
| Chauffeur of London Ltd | Transport & logistics | 2024 |
| Chauffeurmate Limited | Education | 2016 |
| CHB Property Group Ltd | Real estate | 2025 |
| Cheamfold Limited | Administrative & support | 1999 |
| Chefo Ltd | Construction | 2013 |
| Chefs Tale Limited | Hospitality | 2025 |