| Canton Kitchen (London) Ltd | Hospitality | 2022 |
| Capo Events Ltd | Wholesale & retail | 2026 |
| Capricorn Two Limited | Professional & scientific | 2025 |
| Capshire Global Talent Solutions Ltd | Education | 2023 |
| Car Body Solutions Limited | Wholesale & retail | 2009 |
| Car Connection Ltd | Wholesale & retail | 2024 |
| Car's Travel Ltd | Transport & logistics | 2023 |
| Carabay Ltd | Administrative & support | 2017 |
| Carbon Green Heat UK Limited | Construction | 2020 |
| Carbon Slate Limited | Construction | 2023 |
| Care Centred Ltd | Health & social care | 2016 |
| Care Homes of Distinction Limited | Health & social care | 2004 |
| Carisbrook Cloudbreak Limited | Administrative & support | 2020 |
| Carlile Aviation Services Ltd | Manufacturing | 2025 |
| Carmel London Limited | Manufacturing | 2014 |
| Carmen Educational Psychology Ltd | Health & social care | 2025 |
| Carnegie Group Ltd | Construction | 2003 |
| Carnegie Steel Buildings Ltd | Construction | 2024 |
| Caroline Macready Consulting Limited | Professional & scientific | 2006 |
| Carrousel Studio Limited | Professional & scientific | 2020 |
| Carrowhugh Group Limited | Administrative & support | 2020 |
| Casa Confianza Limited | Real estate | 2014 |
| Caserta Hairdressing Limited | Other services | 2000 |
| Casscom Limited | Wholesale & retail | 2003 |
| Casserley Investment Limited | Administrative & support | 2020 |
| Cassidy Property Ltd | Real estate | 2020 |
| Casteel Capital LLP | | 2006 |
| Castle Gate Films Ltd | Information & communication | 2017 |
| Castlefield Enterprises Limited | Hospitality | 2009 |
| Castlerigg Limited | Professional & scientific | 2011 |
| Castleton Construction Ltd | Construction | 2026 |
| Causeway Investment Management Limited | Financial services | 2021 |
| Cava Media Limited | Health & social care | 2004 |
| Caverswall Court Residents Association Limited | Households | 1996 |
| CBD Supply Chain UK Co. Limited | Wholesale & retail | 2020 |
| CC Interim Solutions Ltd | Financial services | 2025 |
| CE Sports Media and Communications Ltd | Professional & scientific | 2026 |
| Cedar Gardens Limited | Households | 1982 |
| Cedar Kitchens Limited | Construction | 2010 |
| Cedar Point Care Ltd | Health & social care | 2026 |
| Cedarwood Solutions Limited | Professional & scientific | 2003 |
| Celebrus Ltd | Other services | 2018 |
| Centre Heating Limited | Wholesale & retail | 2002 |
| CG Seismic Ltd | Professional & scientific | 2026 |
| CGC Elite Limited | Arts & recreation | 2020 |
| Cgop (NO. 2) Ltd | Administrative & support | 2019 |
| Chameleon Block Management Limited | Real estate | 2012 |
| Chameleon Design and Developments Limited | Construction | 2007 |
| Chandon Lodge (Freehold) Limited | Households | 2009 |
| Chandon Lodge Management Company Limited | Households | 1994 |
| Chapple Holdings Ltd | Real estate | 2019 |
| Chapter House Management Company Limited | Real estate | 2005 |
| Chapter Investments Ltd | Real estate | 2017 |
| Chapter SP Limited | Construction | 2025 |
| Charles & Company (Services) Limited | Administrative & support | 2002 |
| Charles & Company Accountancy Limited | Professional & scientific | 2005 |
| Charley's Health Ltd | Hospitality | 2022 |
| Charli Cohen Ltd | Manufacturing | 2014 |
| Charlwood Day Nursery Group Ltd | Real estate | 2014 |
| Charmwood (UK) Limited | Real estate | 1998 |
| Charrington Farming Partnership LP | | 2021 |
| Charrington Property Partnership LP | | 2021 |
| Chart Lane Limited | Construction | 2008 |
| Chart Plan (2004) Limited | Professional & scientific | 2004 |
| Cheam Barbers Ltd | Other services | 2021 |
| Chef China Limited | Hospitality | 2025 |
| Chef Source Recruitment Ltd | Administrative & support | 2024 |
| Chemsage Limited | Professional & scientific | 2006 |
| Cherry House (Catford) Limited | Hospitality | 2023 |
| Chevian Properties Limited | Extraterritorial | 1990 |
| Chicken Time Ltd | Hospitality | 2018 |
| Chido South Limited | Hospitality | 2015 |
| Chiltern Management Services Limited | Professional & scientific | 1999 |
| Chiltern Property Advisors Limited | Real estate | 2010 |
| Chiltington Consultants Limited | Professional & scientific | 2018 |
| Chipstead Consultancy LLP | | 2009 |
| Choksaen Limited | Hospitality | 2014 |
| Chowmin Limited | Hospitality | 2023 |
| Chrave Technology Ltd | Information & communication | 2008 |
| Chris Parkes Photographer Ltd | Professional & scientific | 2014 |
| Christchurch Park (Sutton) Management Company Limited | Households | 2005 |
| Christopher Miners Limited | Professional & scientific | 2010 |
| Chuck Enterprise Ltd | Information & communication | 2024 |
| Chuffed Campaigns CIC | Public administration | 2025 |
| Church Hill Garage of Orpington Limited | Wholesale & retail | 1976 |
| Cignet Energy Limited | Real estate | 2013 |
| Cignet Property Limited | Real estate | 2011 |
| CIL (It-Consulting) Limited | Other services | 2017 |
| Citibat UK Limited | Manufacturing | 2020 |
| Citizen Awards (UK) Limited | Information & communication | 2012 |
| City Computing Holdings Limited | Real estate | 2001 |
| City Computing Property Limited | Real estate | 2013 |
| CJ & H Holdings Limited | Financial services | 2018 |
| CJ & H Property Limited | Real estate | 2019 |
| CK Glass Ltd | Other services | 2017 |
| CK Masonry Ltd | Manufacturing | 2019 |
| CK Pharma Consultancy Ltd | Professional & scientific | 2021 |
| Claire Barraclough Communications Ltd | Professional & scientific | 2016 |
| Clean Reset UK Ltd | Administrative & support | 2026 |
| Clear ERP Consulting Ltd | Information & communication | 2020 |