| Carjan Developments Limited | Construction | 2010 |
| Carleasing Midlands Ltd | Financial services | 2002 |
| Carlton Care (Holdings) Limited | Health & social care | 2013 |
| Carlton Care Homes Ltd | Health & social care | 2002 |
| Carnation Green UK Ltd | Administrative & support | 2021 |
| Caroline Russell HR & Workplace Mediation Ltd | Professional & scientific | 2025 |
| Carp Luxe Limited | Agriculture & fishing | 2024 |
| Cars and Van Sales Ltd | Wholesale & retail | 2017 |
| Carte Blanche Records Ltd | Information & communication | 2010 |
| Carter & Bennett Limited | Hospitality | 2010 |
| Cartwright Language Services Limited | Other services | 2002 |
| Carver Rewind Services Limited | Manufacturing | 2009 |
| Casa MC Limited | Real estate | 2025 |
| Cascade Care Group Limited | Health & social care | 2006 |
| Cascade Care Holdings Limited | Health & social care | 2006 |
| Case Gear Limited | Wholesale & retail | 2011 |
| Cassian Consultancy Services Ltd | Professional & scientific | 2003 |
| Castle Golf Bar Limited | Hospitality | 2022 |
| Castlemore (Beckton) Limited | Construction | 1999 |
| Castlemore Group Holdings Limited | Professional & scientific | 2007 |
| Castlemore Holdings Limited | Professional & scientific | 1998 |
| Caverdee Innovations Limited | Wholesale & retail | 2021 |
| Cavu Tech Limited | Extraterritorial | 2021 |
| Cazore Ltd | Wholesale & retail | 2025 |
| CBZ Valley Ltd | Health & social care | 2018 |
| CCO Theatrical Limited | Arts & recreation | 2000 |
| CD Lynton Holdings Ltd | Real estate | 2024 |
| CDO Routing Solutions Ltd | Construction | 2021 |
| Cedar Invest (ELJ) Limited | Financial services | 2021 |
| Cedar Invest (Lewisham) Limited | Real estate | 2023 |
| Cedar Invest (Macclesfield) Limited | Real estate | 2021 |
| Cedar Invest (Private Equity) Limited | Financial services | 2016 |
| Cedar Invest ELJ (Stafford) Limited | Real estate | 2022 |
| Cedar Invest Group Limited | Extraterritorial | 2021 |
| Cedar Invest Limited | Real estate | 2004 |
| Cedar Invest One (Property) Limited | Real estate | 2020 |
| Cedar Invest One Limited | Real estate | 2019 |
| Cedar Investments (Bournemouth) Limited | Real estate | 1998 |
| Cedar Investments (Holdings) Limited | Professional & scientific | 1998 |
| Cedar Investments (Portfolio) Limited | Real estate | 2004 |
| Cedar Investments Limited | Real estate | 1998 |
| Cedarvale Developments Limited | Construction | 2011 |
| Ceiling & Partition Design Limited | Construction | 1992 |
| Celsia Ltd | Information & communication | 2025 |
| Central Creches Ltd | Administrative & support | 2025 |
| Central Design Consultants Limited | Professional & scientific | 2000 |
| Central Design Group Limited | Financial services | 2024 |
| Central Heating & Cooling Ltd | Construction | 2022 |
| Central Signal Services Limited | Construction | 2016 |
| Centre Security Innovations Limited | Administrative & support | 2009 |
| Centrus Finance Ltd | Financial services | 2019 |
| Centurion Group Holding Limited | Administrative & support | 2026 |
| Centurion Medical Group Limited | Health & social care | 2025 |
| Centurion Training & Welfare Limited | Education | 2026 |
| Cequin Ltd | Information & communication | 2001 |
| CF Children's Homes Ltd | Health & social care | 2021 |
| Cfswh Limited | Financial services | 2020 |
| CGB Ltd | Extraterritorial | 2023 |
| CH Intel Ltd | Other services | 2025 |
| Chaco Construction Consultants Ltd | Professional & scientific | 2014 |
| Chameleon Controls Ltd | Wholesale & retail | 2011 |
| Chameleon Web Services Limited | Information & communication | 2010 |
| Chandel Group Limited | Construction | 2018 |
| Chandler Lifts Limited | Professional & scientific | 2023 |
| Chapelfield Mews Management Company Limited | Households | 2003 |
| Chapelhouse Property Services Ltd | Construction | 2022 |
| Chapter Restaurant Ltd | Hospitality | 2021 |
| Charles Court (Freehold) Limited | Administrative & support | 2016 |
| Charles Maddison Partnership Limited | Financial services | 2006 |
| Charlotte Clark Designer Maker Limited | Arts & recreation | 2019 |
| Charter Court Management Services Limited | Real estate | 2005 |
| Chartwells Accountants Holdings Limited | Financial services | 2021 |
| Chartwells Accountants Limited | Professional & scientific | 2003 |
| Charwill Consultancy Limited | Administrative & support | 2017 |
| Chasewater View Limited | Real estate | 2024 |
| CHE Bello Ltd | Other services | 2009 |
| Checketts Surveyors Limited | Real estate | 2013 |
| Chequer Investments Limited | Real estate | 2022 |
| Cherok and Chai Ltd | Hospitality | 2025 |
| Cherry Diva Limited | Wholesale & retail | 2024 |
| Chesterfield Road Developments Ltd | Construction | 2019 |
| Chesters Car Sales Ltd | Wholesale & retail | 2025 |
| Chiara Events Limited | Other services | 2021 |
| Chico Coffee Ltd | Hospitality | 2025 |
| Chief Maintenance & Electrical Ltd | Construction | 2021 |
| Choose&Pick Ltd | Wholesale & retail | 2024 |
| Chop Box Ltd | Hospitality | 2025 |
| Chopra’S OFF License Ltd | Wholesale & retail | 2025 |
| Chumb Traders Ltd | Wholesale & retail | 2025 |
| Church Court Consultants Limited | Professional & scientific | 1996 |
| Ciao Chocolate Co. Ltd | Manufacturing | 2024 |
| Circle Collective CIC | Education | 2025 |
| City 7 Construction Limited | Construction | 2024 |
| City Concert Organisation Limited | Arts & recreation | 1998 |
| City Duct Cleaning Ltd | Administrative & support | 2025 |
| City Duct Ltd | Construction | 2022 |
| City Forge Limited | Manufacturing | 1954 |
| City Rise Media Ltd | Professional & scientific | 2026 |
| Citywide Auto Glass Ltd | Wholesale & retail | 2026 |
| CJ North Transport Ltd | Transport & logistics | 2019 |