| Crystals Engineering Limited | Information & communication | 2019 |
| Crystalside Limited | Other services | 2013 |
| CSB Mini Mart Ltd | Wholesale & retail | 2025 |
| CSC Common Sense Consulting Ltd | Construction | 2011 |
| CSM Leisure Ltd | Arts & recreation | 2026 |
| CTA Fire Limited | Professional & scientific | 2024 |
| CU29 Holdings Limited | Financial services | 2026 |
| Cube Plumbing & Heating Limited | Construction | 2019 |
| Cubic Pharmaceuticals Limited | Wholesale & retail | 2008 |
| Culverley Road Management Company Limited | Households | 1989 |
| Cumfilux Beds Limited | Extraterritorial | 1993 |
| Curaleak Water Repairs Limited | Other services | 2009 |
| Curtilage Management Limited | Households | 2019 |
| Curtilage Property LLP | | 2009 |
| Curtis GEE Building Services Ltd | Professional & scientific | 2023 |
| CUT Thru Studios Limited | Other services | 2012 |
| Cutting Edge Renovations Ltd | Construction | 2008 |
| Cuxton Cars Limited | Transport & logistics | 2023 |
| Cuxton Hand Car Wash and Valeting Ltd | Other services | 2025 |
| Cuxton HCW Ltd | Wholesale & retail | 2026 |
| Cuxton Kebab & Pizza Limited | Hospitality | 2024 |
| Cuxton Self Storage Ltd | Transport & logistics | 2016 |
| Cuxton Villages Store Ltd | Wholesale & retail | 2026 |
| CVS Diesel Ltd | Extraterritorial | 2014 |
| CVS Pentapower Ltd | Extraterritorial | 2014 |
| CW Search Limited | Administrative & support | 2025 |
| CW1 Freeholds Ltd | Real estate | 2024 |
| CW1 Property Ltd | Real estate | 2024 |
| CWC Properties Investments Ltd | Real estate | 2021 |
| CXC Solutions Ltd | Administrative & support | 2022 |
| Cybarch Ltd | Information & communication | 2023 |
| Cyclone Music Productions Limited | Other services | 1996 |
| Cygnet Engineering Limited | Professional & scientific | 2024 |
| Cymel Ltd | Information & communication | 2016 |
| D & C Groundworks Ltd | Construction | 2005 |
| D & H Restorations Ltd | Construction | 2018 |
| D & J Properties (London) Limited | Real estate | 2017 |
| D & K Installations Limited | Administrative & support | 2023 |
| D & N Building Services (UK) Ltd | Construction | 2018 |
| D & T Accounting Solutions Limited | Professional & scientific | 1997 |
| D a Williams Limited | Construction | 2018 |
| D and D Okeytec Limited | Construction | 2014 |
| D B L Scaffolding Limited | Construction | 2017 |
| D Body Developments Ltd | Construction | 2016 |
| D Body Holdings Limited | Financial services | 2020 |
| D Body Property Developments Limited | Construction | 2021 |
| D Burton Electrical & Testing Services Limited | Construction | 2014 |
| D C Welding Ltd | Construction | 2026 |
| D CLEANING25 Limited | Administrative & support | 2025 |
| D E GAS Services Ltd | Construction | 2021 |
| D Erangey Electrical Services Limited | Construction | 2016 |
| D Harris & Sons Ltd | Construction | 2022 |
| D J Harris Building Services Ltd | Construction | 2025 |
| D J Harris Electrical Services Ltd | Construction | 2025 |
| D J Motorsport Limited | Arts & recreation | 1995 |
| D J S Plumbing and Heating Solutions Limited | Construction | 2015 |
| D Kays Limited | Health & social care | 2024 |
| D M a Group Ltd | Professional & scientific | 2006 |
| D N South East Ltd | Health & social care | 2025 |
| D P S Management and Building Services Ltd | Administrative & support | 2017 |
| D S Gardening Co Limited | Administrative & support | 2025 |
| D&A Construction Group Ltd | Construction | 2023 |
| D&A Holdings (Kent) Ltd | Other services | 2022 |
| D&G Creations Ltd | Administrative & support | 2020 |
| D&G Florist & Flowers by Frankie Davison Ltd | Wholesale & retail | 2025 |
| D&J Investment Property Limited | Real estate | 2015 |
| D&M Baroni Cleaning Services Ltd | Administrative & support | 2025 |
| D&S Precision Landscaping Ltd | Administrative & support | 2023 |
| D&Tmetals Ltd | Wholesale & retail | 2025 |
| D,J & T Mason Taping & Jointing Ltd | Construction | 2025 |
| D-Onecuisine Limited | Hospitality | 2013 |
| D. Body Limited | Water & waste | 2007 |
| D. Leach & SON Ltd | Extraterritorial | 2020 |
| D.B.Decs Limited | Construction | 2013 |
| D.J.H. Engineers Limited | Administrative & support | 1983 |
| D.K.I. Services Limited | Administrative & support | 2005 |
| D.L.S Commercial Ltd | Wholesale & retail | 2020 |
| D.P.T.Contractors Ltd | Construction | 2004 |
| D.S.K. Building Services Ltd | Construction | 1997 |
| D.W. Property Specialists Limited | Construction | 2018 |
| DAB Hand Details Limited | Administrative & support | 2022 |
| Dabim Limited | Health & social care | 2016 |
| Dailybread Studio Ltd | Arts & recreation | 2025 |
| Daisy’S Flower Preservation Ltd | Arts & recreation | 2024 |
| Dajoha Properties Ltd | Real estate | 2022 |
| Dakers Marriott Dugdale Limited | Professional & scientific | 2013 |
| DAL Performance Ltd | Wholesale & retail | 2021 |
| Dalby Consulting Limited | Real estate | 2005 |
| Dalsoft Ltd | Information & communication | 2013 |
| Dambus Limited | Health & social care | 2023 |
| Damgood Limited | Construction | 2008 |
| Damithon Limited | Manufacturing | 2014 |
| Damnedance Ltd | Information & communication | 2025 |
| Damp Detectives London and South Ltd | Professional & scientific | 2019 |
| Damtey Ltd | Real estate | 2015 |
| Dance’S Farm Shop Ltd | Manufacturing | 2021 |
| Dancharm Limited | Wholesale & retail | 2025 |
| Danday Ltd | Construction | 2025 |
| Daner - Denisa Logistics Limited | Wholesale & retail | 2015 |
| Danfeld Consulting Limited | Professional & scientific | 2022 |