| Cryptal Ltd | Administrative & support | 2024 |
| Crystal Books Limited | Professional & scientific | 2018 |
| CSC Financial Ltd | Financial services | 2014 |
| CTV Lifts UK Ltd | Manufacturing | 2022 |
| CTV UK Services Ltd | Professional & scientific | 2024 |
| Curley Hurley's Dog Grooming Limited | Other services | 2021 |
| Custom Fitted Blinds Limited | Wholesale & retail | 2019 |
| CW Event Services Ltd | Professional & scientific | 2024 |
| CWP Resolutions Ltd | Other services | 2022 |
| Cyan Distribution Ltd | Professional & scientific | 2005 |
| D & M Estates Limited | Real estate | 1998 |
| D Howes Engineering Services Limited | Professional & scientific | 2016 |
| D J E Enterprises Limited | Real estate | 2026 |
| D L C a Enterprises Limited | Real estate | 2023 |
| D&B Developments (Essex) Ltd | Real estate | 2017 |
| D&L's Flat Roofing Limited | Construction | 2017 |
| D&S Traders Ltd | Wholesale & retail | 2024 |
| D.I.S. Motor Factors Limited | Wholesale & retail | 1996 |
| D.M.S. Wood Ltd | Professional & scientific | 2018 |
| D.O. Investments Limited | Real estate | 2006 |
| D.R.M. Developments Limited | Construction | 2003 |
| D4B Events Limited | Hospitality | 2018 |
| Daily Prompt Ltd | Information & communication | 2020 |
| Dalwood Investments LLP | | 2011 |
| Dana Solutions Limited | Information & communication | 2018 |
| Dando Drilling International Limited | Manufacturing | 1983 |
| Daniel Little Properties Limited | Real estate | 2024 |
| DAP Joinery Co. Ltd | Manufacturing | 2022 |
| Darcybrook Ltd | Administrative & support | 2025 |
| Dark Wolf Ltd. | Professional & scientific | 2011 |
| Darko Production Ltd | Professional & scientific | 2026 |
| Data Strategy Expert Limited | Information & communication | 2018 |
| Dave's Roadrunner Transport Limited | Transport & logistics | 2021 |
| David Barham Furniture Limited | Manufacturing | 2012 |
| David Luton Jewellers Ltd | Wholesale & retail | 2024 |
| David Luton Limited | Wholesale & retail | 2017 |
| David Mobbs Advisory Limited | Professional & scientific | 2015 |
| David White Investments Ltd | Financial services | 2018 |
| Davids Way Freehold Limited | Households | 2020 |
| DAW Site Services Ltd | Construction | 2017 |
| Daws Heath Road 1964 Limited | Extraterritorial | 2014 |
| Day Time Drinks Limited | Wholesale & retail | 2025 |
| DB Heating Services Ltd | Construction | 2018 |
| Dbf&I Limited | Manufacturing | 2025 |
| DBM Comms Services Limited | Information & communication | 2013 |
| Dbouk Ltd | Hospitality | 2023 |
| Dcbl Limited | Construction | 2016 |
| Dcentres Limited | Professional & scientific | 2015 |
| DD 38 Limited | Real estate | 2025 |
| DDR 500 Ltd | Professional & scientific | 2019 |
| Decide to BE Happy Limited | Financial services | 2019 |
| Decnate Ltd | Professional & scientific | 2023 |
| DECONTAMIN8 (Europe) Limited | Manufacturing | 2013 |
| DECONTAMIN8 Limited | Manufacturing | 2013 |
| Deerhead Solutions Limited | Information & communication | 2026 |
| Delton Property Limited | Administrative & support | 2018 |
| Denzel Bentley Boxing Limited | Arts & recreation | 2019 |
| Dermatetics Ltd | Health & social care | 2022 |
| Designer Home and Garden Ltd | Wholesale & retail | 2013 |
| Developing Professionals International Ltd | Administrative & support | 2012 |
| DG Drylining Limited | Construction | 2015 |
| DGM (Broadway) Limited | Real estate | 2005 |
| DGM (Chelmsford) Limited | Real estate | 2006 |
| DGM Investment Company Limited | Real estate | 2008 |
| DGM London Road Limited | Real estate | 2007 |
| DGM Property Rentals Limited | Real estate | 2007 |
| DHH Ltd | Wholesale & retail | 2018 |
| DHM Global Operators Ltd | Construction | 2008 |
| Diamond Nails Spa Limited | Other services | 2025 |
| Dick George Creatives Limited | Administrative & support | 2007 |
| Dicky G Studio Limited | Extraterritorial | 2012 |
| DID Real Estate Ltd | Real estate | 2024 |
| Digital Peaches Ltd | Information & communication | 2022 |
| Digitech Alpha Ltd | Information & communication | 2015 |
| Diligent Commercial Cleaning Limited | Administrative & support | 2019 |
| Dimentions Ltd | Construction | 2016 |
| Diragan Ltd | Wholesale & retail | 2026 |
| Direct Container Repairs Limited | Manufacturing | 2007 |
| Directly Authorised Limited | Financial services | 2020 |
| Directoryys Facilities Management Ltd | Administrative & support | 2025 |
| Disco Driving School Ltd | Education | 2024 |
| Discount Windscreens Ltd | Wholesale & retail | 2003 |
| DJG Property Investments Limited | Real estate | 2022 |
| DJH Property Maintenance Ltd | Construction | 2020 |
| DK & EK Holdings Limited | Education | 2017 |
| DLM & Co Management Limited | Professional & scientific | 2017 |
| DM Maintenance 1 Ltd | Water & waste | 2024 |
| DMH Consultancy Limited | Administrative & support | 2016 |
| Dmlt Property Limited | Real estate | 2025 |
| DNH Financial Ltd | Financial services | 2014 |
| Doesgate Farm Ltd | Real estate | 2021 |
| Doherty Dog Services Limited | Other services | 2023 |
| Dojo Development Ltd | Professional & scientific | 2019 |
| Dominion Property Limited | Real estate | 2002 |
| Donald Holdings Limited | Real estate | 2018 |
| Doncel Court Management Co. Limited | Households | 1970 |
| Donna Forte Ltd | Wholesale & retail | 2023 |
| Door Finger Guards Limited | Extraterritorial | 2017 |
| Door Finger Protection Limited | Extraterritorial | 2017 |
| Door Safety Products Limited | Extraterritorial | 2017 |