| Changing Landscapes Limited | Administrative & support | 2011 |
| Charlotte Josephina Ltd | Health & social care | 2025 |
| Chart Property Limited | Real estate | 2024 |
| Charterhouse Productions Limited | | 1992 |
| Chauffeur Streams Ltd | Transport & logistics | 2024 |
| Chefkonditor Ltd | Professional & scientific | 2024 |
| Cherlex Company Limited | Health & social care | 2015 |
| Chertsey Road (Chobham) Management Company Limited | Households | 2020 |
| Cheryl Court Maintenance Company Limited | Households | 1966 |
| Chester Jones Limited | Arts & recreation | 1990 |
| Chestnut International Ltd | Professional & scientific | 2022 |
| Cheung's Brothers Enterprises (UK) Company Limited | Wholesale & retail | 2022 |
| Cheval Court Management Limited | Households | 1964 |
| Chichchester House Management Limited | Households | 2021 |
| Chichester House (Kingston) Management Company Limited | Households | 1997 |
| Chick and Beers Limited | Hospitality | 2018 |
| Chicken Chicking Limited | Hospitality | 2018 |
| Chicwham Beauty Ltd | Other services | 2024 |
| Chicwham Mayfair Ltd | Other services | 2024 |
| Chillworth Engineering Limited | Construction | 2002 |
| Chiltern Management Associates Ltd | Real estate | 2020 |
| Chimacuk Ltd | Hospitality | 2021 |
| China World 322 Ltd | Hospitality | 2024 |
| Chique Pets Grooming Parlour Ltd | Other services | 2016 |
| Choi'Ce Cake & Coffee Ltd | Hospitality | 2020 |
| Chris Skinner IT Ltd | Information & communication | 2015 |
| Church Road Management Company Limited | Households | 1988 |
| Churchill DRY Cleaners (Reigate) Ltd | Other services | 2010 |
| Cicero Consultancy Ltd | Health & social care | 2022 |
| CIN Consultants Limited | Professional & scientific | 2014 |
| Circle of Professionals Limited | Wholesale & retail | 2019 |
| City Grounds Group Ltd | Administrative & support | 2022 |
| City Theatrical Limited | Administrative & support | 2008 |
| CJ Sushi Limited | Wholesale & retail | 2023 |
| CJO Real Estate Limited | Real estate | 2026 |
| CK Decorating Ltd | Construction | 2016 |
| Clachan Design Ltd | Arts & recreation | 2014 |
| Claire Harrison Photography Ltd | Arts & recreation | 2013 |
| Claremont Lodge (Wimbledon) Limited | Households | 1998 |
| Clarendon Estate Limited | Real estate | 2007 |
| Clarkie's Cars Ltd | Transport & logistics | 2022 |
| Classic AG Ltd | Other services | 2023 |
| Classic Cutter Ltd | Other services | 2024 |
| Claywoods Property Ltd | Real estate | 2025 |
| CLC Orchestral Promotions Limited | Arts & recreation | 2017 |
| Clean & Tidy Limited | Administrative & support | 2005 |
| Clean Lines Marketing Ltd | Professional & scientific | 2019 |
| Cleaning Project General Ltd | Administrative & support | 2023 |
| Clear Plan Design Group Ltd | Professional & scientific | 2019 |
| Clear Thinking Consultancy Limited | Professional & scientific | 2011 |
| Clearview Court Management Services Ltd | Real estate | 2022 |
| Cleva Cleaning Ltd | Administrative & support | 2025 |
| CLG Design Ltd | Professional & scientific | 2018 |
| CLICK4PRINT.CO.UK Ltd | Extraterritorial | 2012 |
| Clickpickbuy Ltd | Wholesale & retail | 2025 |
| Clifton Bentley Property 1 Ltd | Real estate | 2023 |
| Clifton Bentley Property 2 Ltd | Real estate | 2023 |
| Clifton Bentley Property 3 Ltd | Real estate | 2024 |
| Clifton Bentley Property Limited | Real estate | 2022 |
| Climadesign Limited | Professional & scientific | 2020 |
| Climate Fiction Prize Ltd | Arts & recreation | 2025 |
| Cliveden Consulting Ltd | Information & communication | 2013 |
| CLN Services (UK) Limited | Health & social care | 2012 |
| Cloud D Analytics Ltd | Professional & scientific | 2020 |
| Cloud Edge Ltd | Professional & scientific | 2018 |
| Cloyda Limited | Health & social care | 1987 |
| Clutch Sports Limited | Wholesale & retail | 2020 |
| CML Electrical Ltd | Energy | 2021 |
| Cmystc Ltd | Hospitality | 2022 |
| CNK Consultancy Limited | Professional & scientific | 2006 |
| CNM Estates ( PUB Co) Limited | Hospitality | 2015 |
| CNM Estates (Apio Holding) Limited | Real estate | 2021 |
| CNM Estates (Canbury) Limited | Real estate | 2017 |
| CNM Estates (Coombe Road) Limited | Construction | 2016 |
| CNM Estates (COX Lane) Limited | Construction | 2016 |
| CNM Estates (Development Management) Limited | Extraterritorial | 2015 |
| CNM Estates (East Bay) Limited | Construction | 2021 |
| CNM Estates (Europe) Limited | Extraterritorial | 2012 |
| CNM Estates (Ewell Road) Limited | Construction | 2016 |
| CNM Estates (Group) Limited | Financial services | 2022 |
| CNM Estates (Kingston Plaza) Limited | Construction | 2013 |
| CNM Estates (Lime Grove) Limited | Extraterritorial | 2019 |
| CNM Estates (New Malden) Limited | Construction | 2014 |
| CNM Estates (Norbiton) Limited | Construction | 2012 |
| CNM Estates (Northpoint) Limited | Construction | 2017 |
| CNM Estates (Quattro Kingston Holdings) Limited | Construction | 2016 |
| CNM Estates (Quattro New Malden Holdings) Limited | Construction | 2016 |
| CNM Estates (Reading) Limited | Extraterritorial | 2013 |
| CNM Estates (Residential Holdings) Limited | Extraterritorial | 2020 |
| CNM Estates (Serviced Apartments) Holdings Limited | Extraterritorial | 2020 |
| CNM Estates (Serviced Office) Holdings Limited | Extraterritorial | 2020 |
| CNM Estates (Tolworth Tower SBP) Limited | Construction | 2015 |
| CNM Estates (Tolworth Tower) Limited | Construction | 2014 |
| CNM Estates (Tolworth) Limited | Construction | 2007 |
| CNM Estates (Walton Central) Limited | Construction | 2021 |
| CNM Estates (WE) Limited | Construction | 2019 |
| CNM Estates (Weresi) Limited | Construction | 2023 |
| Cnuk Consulting Ltd | Administrative & support | 2014 |
| Coal Reversions Limited | Real estate | 2024 |
| Cocoja Limited | Wholesale & retail | 2018 |