| Crvt Ltd | Professional & scientific | 2022 |
| Crystal Horizon Limited | Information & communication | 2024 |
| Crystal Palace Psychology Practice Ltd | Health & social care | 2019 |
| CS Consulting & Sourcing Ltd | Information & communication | 2026 |
| CSC Computer Sciences Limited | Information & communication | 1969 |
| CTC Industrial Ltd | Professional & scientific | 2023 |
| CTS Equity Ltd | Real estate | 2017 |
| Cube Airconditioning Limited | Manufacturing | 2005 |
| Cubies Ltd | Manufacturing | 2025 |
| Cufaude Company Limited | Extraterritorial | 2023 |
| Cuisinely Ltd | Information & communication | 2025 |
| Custom Alloy Design Limited | Professional & scientific | 2022 |
| Cuticleco. Ltd | Wholesale & retail | 2023 |
| Cutting Hedge Corporation Limited | Administrative & support | 2016 |
| CW Golf UK Ltd | Construction | 2023 |
| Cwtch Kitchens Limited | Construction | 2011 |
| Cyara Ltd | Information & communication | 2022 |
| Cybermoon Ltd | Information & communication | 2026 |
| Cygnets Management Limited | Professional & scientific | 2000 |
| Cyprus Green Property Investments Limited | Real estate | 2022 |
| D & B Building Contractors LLP | | 2011 |
| D & D Construction (South) Ltd | Construction | 2019 |
| D & G Building and Drainage Services Ltd | Construction | 2011 |
| D a Smith (Property Maintenance) Ltd | Construction | 2012 |
| D&E Extraction & Ducting Ltd | Administrative & support | 2017 |
| D&L Rope Access Ltd | Manufacturing | 2022 |
| D&Rig Ltd | Information & communication | 2024 |
| D&T Property Investments Limited | Real estate | 2018 |
| D'S Hair Salon Limited | Other services | 2023 |
| D. MAC Heating & Plumbing Limited | Construction | 2016 |
| D7 Advisers Limited | Professional & scientific | 2021 |
| Daaduna Limited | Administrative & support | 2018 |
| Daas Group Ltd | Construction | 2018 |
| Daju Properties Ltd | Financial services | 2024 |
| DAM Creative Carpentry & Construction Ltd | Construction | 2019 |
| Dance Vance Ltd | Education | 2022 |
| Daniel Adcock Consulting Ltd | Professional & scientific | 2025 |
| Daniel Lofts Enterprises Ltd | Professional & scientific | 2011 |
| Danielle Julienne Ltd | Other services | 2023 |
| Daniels Investment Two Limited | Administrative & support | 2015 |
| Daniels Investments Limited | Real estate | 2014 |
| Dariarte Ltd | Wholesale & retail | 2018 |
| Darius CNC Limited | Manufacturing | 2016 |
| Darkside Composites Ltd | Manufacturing | 2024 |
| Darlington Advisors Limited | Professional & scientific | 2026 |
| Darrington Residents' Association Limited | Households | 1996 |
| Dartford River Crossing Trustees Limited | Financial services | 1985 |
| Darwell Plumbing & Heating Ltd | Professional & scientific | 2018 |
| Dasatva Ltd | Wholesale & retail | 2017 |
| Dasign Ltd | Information & communication | 2011 |
| DAT Consulting Limited | Administrative & support | 2022 |
| Data Product Services Limited | Information & communication | 1999 |
| Datanet.Co.Uk Limited | Information & communication | 1996 |
| Datatale Consulting Ltd | Information & communication | 2025 |
| Datum Bidco Limited | Information & communication | 2021 |
| Datum Datacentres Limited | Information & communication | 2012 |
| Datum Topco Limited | Financial services | 2016 |
| David Joyce and Company Limited | Construction | 2013 |
| David Webb UK Limited | Wholesale & retail | 2017 |
| Dawn Court (Camberley) Residents Association Limited | Households | 2001 |
| Daxur Studios Ltd | Extraterritorial | 2020 |
| DB Civils and Groundwork Ltd | Construction | 2018 |
| DBH Builders Limited | Construction | 2014 |
| DC Traffic Management Services Ltd | Construction | 2024 |
| Dcim Services Ltd | Professional & scientific | 2021 |
| DCMAINTENANCE9 Limited | Construction | 2025 |
| Dcsl Group Limited | Financial services | 2020 |
| Dcsl Holdings Limited | Financial services | 2020 |
| Dcsl Management Limited | Financial services | 2013 |
| Dcsl Midco Limited | Financial services | 2021 |
| Dcsl Newco Limited | Financial services | 2023 |
| DCW O'Connell MBE. Ltd | Professional & scientific | 2008 |
| DE Angel Ltd | Information & communication | 2022 |
| DE Ultimate Limited | Administrative & support | 2023 |
| De-Vale Ltd | Real estate | 2019 |
| Dead on Digital Ltd | Professional & scientific | 2023 |
| Dear Limited | Professional & scientific | 2008 |
| Deborah COX and Company Limited | Professional & scientific | 2005 |
| December 2015 Software Limited | Administrative & support | 2015 |
| Deco Cleaning Expert Ltd | Wholesale & retail | 2024 |
| Dedios Ltd | Information & communication | 2021 |
| DEE Environmental Solutions Limited | Professional & scientific | 2012 |
| Deepseed Insights Ltd | Information & communication | 2025 |
| Defensia Ltd | Administrative & support | 2024 |
| Definitions Detailing Ltd | Manufacturing | 2021 |
| Delayed Departure Ltd | Wholesale & retail | 2021 |
| Delian Ltd | Manufacturing | 2015 |
| Deliverable Sustainable Development Limited | Professional & scientific | 1998 |
| Delta Global Limited | Manufacturing | 2019 |
| Deltronic Limited | Manufacturing | 1944 |
| Delux Interiors Ltd | Construction | 2025 |
| Dema Decorations Ltd | Construction | 2024 |
| Dema Home Improvements Ltd | Construction | 2022 |
| Denby Court Management Company Limited | Households | 1994 |
| Dene Estate Residents Association Limited | Arts & recreation | 2016 |
| Denning Male Polisano Limited | Professional & scientific | 2001 |
| Denrose Care Ltd | Health & social care | 2021 |
| Denver Scientific Ltd. | Manufacturing | 2021 |
| Derek Richards and Partners Limited | | 1970 |
| Designdock Multimedia Ltd | Information & communication | 1999 |