| Diatech Equipment Company Limited | | 1987 |
| DIB Global Ltd | Professional & scientific | 2021 |
| DIB Services Ltd | Construction | 2015 |
| DIB Survey Ltd | Professional & scientific | 2021 |
| Dibden Court Management Company Limited | Other services | 2004 |
| Dice Roll Spirits Limited | Professional & scientific | 2018 |
| Dicenco Limited | Administrative & support | 2023 |
| Dicey Limited | Information & communication | 2026 |
| DICKIE007 Limited | Administrative & support | 2005 |
| Dickon Hinchliffe Limited | Arts & recreation | 2010 |
| Dickson Kitchens & Interiors Ltd | Construction | 2018 |
| Dicu Ltd | Administrative & support | 2025 |
| DID Productions Ltd | Hospitality | 2025 |
| Dida Cutz Ltd | Other services | 2024 |
| Didac Education LLP | | 2015 |
| Didac Limited | Education | 1997 |
| Didajo Limited | Financial services | 2019 |
| Didcot Park Homes Limited | Hospitality | 2010 |
| Diddlydiddlydee Ltd | Hospitality | 2024 |
| Dido Consult Limited | Information & communication | 2023 |
| Diefenbaker Product Solutions Ltd | Information & communication | 2023 |
| Diego Valderrey Garcia Ltd | Health & social care | 2023 |
| Dieter Lloyd Marketing Consultancy Ltd | Professional & scientific | 2023 |
| Dietmar Wenzel Engineering Limited | Information & communication | 2010 |
| Different Kettle Limited | Professional & scientific | 2000 |
| Different Space Ltd | Education | 2002 |
| Diffusion Films Ltd | Information & communication | 2025 |
| DIG Fieldcraft Limited | Professional & scientific | 2015 |
| DIG Shot Films Ltd | Information & communication | 2025 |
| Digby Associates Limited | Financial services | 2007 |
| Digey Car Park Limited | Households | 1999 |
| Digg IT Solutions Limited | Information & communication | 2010 |
| Digger Delivery Ltd | Administrative & support | 2023 |
| Digging Deeper Today Ltd | Real estate | 2011 |
| Digialitay Ltd | Extraterritorial | 2021 |
| Digibox Arts Ltd | Arts & recreation | 2023 |
| Digicure.Uk Ltd | Professional & scientific | 2023 |
| Digieng. Ltd | Information & communication | 2024 |
| Digifinancial Ltd | Information & communication | 2023 |
| Digilive Events Limited | Administrative & support | 2020 |
| Digiphone Limited | Wholesale & retail | 2004 |
| Digisavvytek Ltd | Information & communication | 2022 |
| Digisprint Ltd | Wholesale & retail | 2025 |
| Digit Wise Balance Ltd | Professional & scientific | 2025 |
| Digital 49 Limited | Information & communication | 2025 |
| Digital Bulls Limited | Other services | 2019 |
| Digital by Default Services Ltd | Information & communication | 2023 |
| Digital Construction Technology Ltd | Information & communication | 2017 |
| Digital Draughting Limited | Professional & scientific | 2022 |
| Digital Ecology Limited | Professional & scientific | 2021 |
| Digital Engineering Ltd | Information & communication | 2010 |
| Digital Fire Design Limited | Professional & scientific | 2007 |
| Digital for Good Ltd | Information & communication | 2021 |
| Digital Go-To Ltd | Information & communication | 2016 |
| Digital Hits Network Limited | Information & communication | 2017 |
| Digital Intensity Ltd | Administrative & support | 2017 |
| Digital Liberty Limited | Information & communication | 2026 |
| Digital Massive Limited | Information & communication | 2001 |
| Digital Natives (DNS) Limited | Information & communication | 2013 |
| Digital Nova Ltd | Information & communication | 2008 |
| Digital NRG Consultancy LLP | | 2017 |
| Digital NRG Limited | Information & communication | 2013 |
| Digital P3M Limited | Information & communication | 2024 |
| Digital Parlay Ltd | Information & communication | 2020 |
| Digital Pro Sounds Ltd | Extraterritorial | 2020 |
| Digital Problem Solving Ltd | Information & communication | 2014 |
| Digital Skills Innovation Ltd | Information & communication | 2023 |
| Digital Solid Limited | Professional & scientific | 2017 |
| Digital Sting Limited | Information & communication | 2022 |
| Digital Technology Services Limited | Administrative & support | 2020 |
| Digital Underground Technology Limited | Information & communication | 2022 |
| Digital Visual Limited | Information & communication | 2023 |
| Digital Vortex Designs Ltd | Professional & scientific | 2025 |
| Digital Yacht Ltd | Manufacturing | 2003 |
| Digital Zing Limited | Manufacturing | 2015 |
| Digital-Dan Cctv Ltd | Other services | 2024 |
| Digital-I Limited | Information & communication | 2003 |
| DIGITAL4D Limited | Construction | 2025 |
| Digitalhound Limited | Information & communication | 2014 |
| Digitally In-Sync Ltd | Professional & scientific | 2022 |
| Digitalpebble Ltd | Information & communication | 2008 |
| Digitec Consultants Ltd | Wholesale & retail | 2023 |
| Digiter Limited | Administrative & support | 2020 |
| Digiterre Communica Limited | Information & communication | 1985 |
| Digitotum Limited | Information & communication | 2026 |
| Digs Swansea Lettings LLP | | 2017 |
| Digworx Ltd | Financial services | 2019 |
| Dijon Ltd | Financial services | 2022 |
| Dijon Platform Ltd | Information & communication | 2017 |
| DIL Curryhouse Ltd | Hospitality | 2026 |
| Diligent Finance Management Ltd | Professional & scientific | 2021 |
| Diligent in the Faith Electrics Ltd | Agriculture & fishing | 2026 |
| Dilit Limited | Administrative & support | 2023 |
| Dillkent Limited | Real estate | 1982 |
| Dillon Court Management Limited | Households | 1993 |
| Dillon Developments Limited | Construction | 2019 |
| Dillon Enterprises Ltd | Financial services | 2024 |
| Dillons Carpentry and Construction Ltd | Construction | 2017 |
| DIM RAT Limited | Wholesale & retail | 2025 |
| Dimambro Consulting Limited | Information & communication | 2018 |