| Cleaning Rooms Limited | Administrative & support | 2007 |
| Cleaveland Capital Management Limited | Financial services | 2025 |
| Clemence Vallot Ltd | Other services | 2024 |
| Clements & Myles Limited | Manufacturing | 2007 |
| Client Connect Services Limited | Information & communication | 2002 |
| Clientwise Limited | Professional & scientific | 2018 |
| Clive Place Residents Association Limited | Households | 1986 |
| CMP System Services Ltd | Information & communication | 2020 |
| Cobra House Limited | Real estate | 2024 |
| Coco Moon Creations Limited | Arts & recreation | 2008 |
| Coleman-Rossi Limited | Professional & scientific | 2023 |
| Colin White (Property) Limited | Real estate | 2016 |
| Collective Coaching Ltd | Education | 2024 |
| Come Across Ltd | Professional & scientific | 2019 |
| Commune Rooms Limited | Real estate | 2025 |
| Compassion First Consulting Ltd | Public administration | 2025 |
| Computing and Bespoke Networks Limited | Administrative & support | 2013 |
| Consensus Limited | Professional & scientific | 2014 |
| Consider This Coaching Limited | Administrative & support | 2018 |
| Contessa International Ltd | Administrative & support | 2013 |
| Contessa Real Estate Ltd | Real estate | 2017 |
| Cooc Productions Limited | Information & communication | 2018 |
| Core Pathways Coaching Limited | Professional & scientific | 2025 |
| Cornerstone Build by Design Limited | Construction | 2021 |
| Costume Collective Limited | Other services | 2012 |
| Cote Jewellery Ltd | Manufacturing | 2025 |
| Courtenay Clarke Associates Ltd | Administrative & support | 2013 |
| Cozy Aviation Limited | Transport & logistics | 1997 |
| Craftedsmiles Ltd | Manufacturing | 2025 |
| Cricktok.Com Ltd | Information & communication | 2022 |
| Croghan IT Consulting Ltd | Information & communication | 2025 |
| Cromus Consulting Limited | Professional & scientific | 2017 |
| Crosslec Limited | Construction | 2014 |
| Crosslet Ltd | Real estate | 2025 |
| Cswn Ltd | Professional & scientific | 2013 |
| Cuelight Productions Ltd | Arts & recreation | 2026 |
| Cupola Properties Limited | Construction | 1988 |
| Cupola Search Ltd | Professional & scientific | 2023 |
| Curzons Management Associates Limited | Professional & scientific | 2004 |
| CV Wallet Ltd | Information & communication | 2022 |
| Cyber Green Consulting Ltd | Information & communication | 2025 |
| Cyclelink Services Ltd | Wholesale & retail | 2016 |
| D. Shaw & Co. (Stitching Wire) Limited | Manufacturing | 1975 |
| D.J.H. Consultants Ltd. | Information & communication | 1993 |
| Dakt Ltd | Wholesale & retail | 2025 |
| Dale Thomas Consulting Ltd | Professional & scientific | 2025 |
| Dall Cleaning Services Public Limited Company | Administrative & support | 1998 |
| Daly Advisory Ltd | Professional & scientific | 2022 |
| DAN Aird Building and Renovation Ltd | Construction | 2021 |
| DAN Roberts Enterprises Limited | Education | 2012 |
| DAN Roberts Training Ltd. | Arts & recreation | 2011 |
| Dandelionrooms Limited | Construction | 2019 |
| Danny Russell Consulting Limited | Professional & scientific | 2012 |
| Data Champloo Ltd | Information & communication | 2021 |
| Dava Consulting Limited | Professional & scientific | 2019 |
| Davensi Group Ltd | Wholesale & retail | 2025 |
| David Wade Productions Limited | Information & communication | 2015 |
| David Wright Direct Limited | Real estate | 2003 |
| Daybuild & Design Ltd | Construction | 2020 |
| Daychester Limited | Real estate | 2013 |
| DBC Cleaning Ltd | Administrative & support | 2023 |
| DD Acupuncture Limited | Health & social care | 2024 |
| Ddabs Ltd | Real estate | 2025 |
| Dean Pavilion Limited | Hospitality | 2010 |
| Decisive Capital Limited | Financial services | 2020 |
| Decommissioning Consultancy Services Limited | Administrative & support | 2017 |
| Deep Tech Innovation Limited | Information & communication | 2025 |
| Degreeart Asia Ltd | Arts & recreation | 2007 |
| Delfinery Ltd | Professional & scientific | 2024 |
| Delicious Dosa Ltd | Hospitality | 2024 |
| Denton Group Limited | Professional & scientific | 1989 |
| Denton Homes (Land 2) Limited | Real estate | 2019 |
| Denton Homes (Land) Limited | Real estate | 2001 |
| Denton Homes FIR Tree Road Limited | Construction | 2013 |
| Denton Homes Limited | Construction | 1986 |
| Denton Homes London Road Limited | Real estate | 2014 |
| Denton Homes Newco Limited | Construction | 2003 |
| Denton Homes Surrey Limited | Real estate | 1999 |
| Denton Homes Sussex Limited | Real estate | 2014 |
| Derrick Design LLP | | 2024 |
| Detailing Autos Limited | Wholesale & retail | 2018 |
| Devon House (Thames Ditton) Ltd | Real estate | 2025 |
| Diamond Event Management Limited | Arts & recreation | 1992 |
| Diccon Lynes BJJ Limited | Administrative & support | 2019 |
| Digital Tools Limited | Information & communication | 2015 |
| Ditton Aesthetics Ltd | Health & social care | 2023 |
| Ditton Consultancy Property Ltd | Real estate | 2021 |
| Ditton Green Ltd | Construction | 2016 |
| Ditton H R Limited | Professional & scientific | 2012 |
| Ditton Squash Club Limited | Arts & recreation | 2021 |
| Ditton Village PVT Limited | Hospitality | 2019 |
| DLT Solutions Ltd | Professional & scientific | 2009 |
| Dmds Consults Limited | Professional & scientific | 2021 |
| Dolwylan Ltd | Hospitality | 2021 |
| Dominic O'Riordan Limited | Information & communication | 2013 |
| DOS on Stage Ltd | Arts & recreation | 2023 |
| DR Anna Ltd | Health & social care | 2021 |
| DR H D Richardson Radiology Ltd | Health & social care | 2024 |
| DR Katie Ltd | Health & social care | 2022 |
| DR Toolbox Ltd | Health & social care | 2012 |