| Dhiba Technology Ltd | Information & communication | 2020 |
| DHP Media Ltd | Information & communication | 2015 |
| DI Napoli One Ltd | Hospitality | 2024 |
| DI Paola Properties Limited | Real estate | 2009 |
| Diamond Dealing Ltd | Wholesale & retail | 2026 |
| Diamond Lichtenstein Ltd | Wholesale & retail | 2023 |
| Dickies Stuff Limited | Wholesale & retail | 2025 |
| Dickins Shiebert Limited | Professional & scientific | 2008 |
| Dienne Limited | Administrative & support | 1992 |
| Diginet Security Ltd | Information & communication | 2020 |
| Digit Commercial Ltd | Real estate | 2021 |
| Digit Properties Ltd | Real estate | 2019 |
| Digital Future Software Limited | Other services | 2018 |
| Digital Solution Services Limited | Information & communication | 2017 |
| Digitalizer Ltd | Information & communication | 2023 |
| Dijee Intelligence Ltd | Professional & scientific | 2025 |
| Diligent Business Group Limited | Administrative & support | 2013 |
| Dillon Consultancy Limited | Professional & scientific | 2021 |
| Dimitrans and Haulage Ltd | Transport & logistics | 2024 |
| Dinton Mill 2007 Limited | Extraterritorial | 1973 |
| Direct Accommodation Ltd | Real estate | 2010 |
| Direct Socks Limited | Wholesale & retail | 1999 |
| DIS Integration Systems Limited | Other services | 2015 |
| Disruptive Studios Ltd | Professional & scientific | 2025 |
| Ditto Assets Ltd | Real estate | 2024 |
| Diversified Holdings Limited | Real estate | 2023 |
| Diversified Holdings NO.1 Limited | Real estate | 2023 |
| Diversified Holdings NO.2 Limited | Real estate | 2023 |
| Diwins Ltd | Arts & recreation | 2016 |
| Djap-Dc-Pb-M Ltd | Other services | 2025 |
| DJM Healthcare Ltd | Health & social care | 2011 |
| DJM Properties Limited | Real estate | 2001 |
| DK Hylton Properties Ltd | Real estate | 2021 |
| DK Publishing Limited | Other services | 2024 |
| DKS Consultants Limited | Financial services | 2020 |
| Dmasonengineer Ltd | Construction | 2018 |
| DMC Corporate Hospitality Ltd | Arts & recreation | 2017 |
| DMI (Herts) Limited | Administrative & support | 2009 |
| DMS Investments (London) Ltd | Real estate | 2025 |
| Dmtk Developments Limited | Construction | 2026 |
| DNY Developments Ltd | Real estate | 2024 |
| Dobra Villa Limited | Professional & scientific | 2014 |
| Docal Limited | Real estate | 1953 |
| Doctormoni Platforms Limited | Information & communication | 2025 |
| Dolcezza Holdings Limited | Financial services | 2015 |
| Domestic Waste Services Ltd | Water & waste | 2025 |
| Donaldson Locksmiths Limited | Wholesale & retail | 2004 |
| Donegal Developments Ltd | Construction | 2013 |
| Donica Health Ltd. | Health & social care | 2009 |
| Dormart Consulting Limited | Professional & scientific | 2014 |
| DOT BIZ Management Limited | Information & communication | 2013 |
| Double Tea Limited | Administrative & support | 2025 |
| DOUBLE8TICKETS Limited | Professional & scientific | 2006 |
| DOUBLE8TICKETS.COM Limited | Administrative & support | 2004 |
| Douleia Limited | Information & communication | 2002 |
| DP Hillside Ltd | Manufacturing | 2025 |
| DR Altun Limited | Health & social care | 2024 |
| DR Dhital Medical Ltd | Administrative & support | 2019 |
| DR Grange & Associates Ltd | Health & social care | 2014 |
| DR King Psychiatric Consultancy Ltd | Health & social care | 2025 |
| Draxium Ltd | Information & communication | 2026 |
| Draycot Investments Limited | Real estate | 1999 |
| Dreamscape and Maintenance Ltd | Administrative & support | 2020 |
| Drini 2X Ltd | Wholesale & retail | 2022 |
| Drive Car Hire Ltd | Administrative & support | 2014 |
| Drive Life Well Limited | Administrative & support | 2018 |
| Drive School Ltd | Other services | 2016 |
| Drivewize Driving Lessons Limited | Transport & logistics | 2003 |
| DRS Business Strategies Ltd | Other services | 2009 |
| Drummond Security (PB) Ltd | Wholesale & retail | 2012 |
| Drylining FIX Ltd | Construction | 2017 |
| DS Print & Services Limited | Manufacturing | 1991 |
| DSL Gardening and Landscaping Ltd | Administrative & support | 2020 |
| DSP Construction Ltd | Construction | 2012 |
| DT Autokeys Limited | Information & communication | 2005 |
| Duck Head Green Limited | Manufacturing | 2023 |
| Duck Software Limited | Information & communication | 2016 |
| Duffin TV Ltd | Information & communication | 2010 |
| Dulak Trading Limited | Administrative & support | 2019 |
| Duncan Perry Potters Bar Ltd | Real estate | 2012 |
| Duncan Tax & Accounts Ltd | Professional & scientific | 2014 |
| Dunmore IT Ltd | Information & communication | 2018 |
| Dunsland House Limited | Health & social care | 2015 |
| Dunster International Ltd | Real estate | 2003 |
| Dushku Property Company Limited | Real estate | 2020 |
| DVD FIX Ltd | Construction | 2017 |
| DYE 2 CUT Ltd | Other services | 2016 |
| Dymchurch Properties Limited | Wholesale & retail | 1999 |
| Dynamic Produce Marketing Ltd | Manufacturing | 2012 |
| Dynamic Stillness Ltd | Health & social care | 2013 |
| Dynamic Studio and Garage Limited | Wholesale & retail | 2024 |
| E & B Solutions Limited | Construction | 2015 |
| E & F Developments Ltd | Construction | 2019 |
| E N London Limited | Construction | 2001 |
| E S Vida Beauty London Ltd | Other services | 2025 |
| E&G Supplies Ltd | Wholesale & retail | 2020 |
| E-Quill Education Consultancy Ltd | Education | 2022 |
| E. a. D. Contractors Limited | Construction | 2015 |
| E.B. Accounting Ltd | Professional & scientific | 2017 |
| E.P.H Metal Works Ltd | Manufacturing | 2018 |