| Diamond (Edibles) Limited | Wholesale & retail | 2017 |
| Diamond Bathrooms and Plumbing Limited | Construction | 2026 |
| Diamond Blinds Ltd | Construction | 2024 |
| Diamond CAB Group Limited | Administrative & support | 2024 |
| Diamond Carpets & Furniture Ltd | Wholesale & retail | 2021 |
| Diamond Designer Interiors Ltd | Construction | 2021 |
| Diamond Domiciliary Care Limited | Health & social care | 2024 |
| Diamond Forwarding Limited | Transport & logistics | 1990 |
| Diamond Frog Limited | Hospitality | 2008 |
| Diamond Ideas Ltd | Other services | 2020 |
| Diamond JAP Hub Ltd | Administrative & support | 2025 |
| Diamond King Ltd | Wholesale & retail | 2022 |
| Diamond Life Solutions Ltd | Manufacturing | 2026 |
| Diamond Link Promotions Ltd | Arts & recreation | 2017 |
| Diamond Phone Tech Ltd | Wholesale & retail | 2025 |
| Diamond Properties Bradford Ltd | Real estate | 2024 |
| Diamond Room by Crystal Limited | Manufacturing | 2018 |
| Diamond Tyres and Tracking Ltd | Wholesale & retail | 2026 |
| Diamond Vitamins Limited | Health & social care | 2025 |
| Diamond Wellbeing Limited | Wholesale & retail | 2018 |
| Diamond-Productz Ltd | Other services | 2025 |
| Diamonddeal Ltd | Manufacturing | 2019 |
| DIAMONDFURNISHING1981 Ltd | Wholesale & retail | 2025 |
| Diamondsmilesbd Limited | Other services | 2021 |
| Diamèra Ltd | Wholesale & retail | 2025 |
| Dick Lane Newsagents Ltd | Wholesale & retail | 2011 |
| Didoo Sports Ltd | Wholesale & retail | 2018 |
| Diet Fuels Ltd | Manufacturing | 2020 |
| Difiori Trading Limited | Wholesale & retail | 2018 |
| Digi-Collab Tech Ltd | Professional & scientific | 2021 |
| Digibuz Ltd | Professional & scientific | 2025 |
| Diginious Limited | Information & communication | 2022 |
| Digiscode Ltd | Professional & scientific | 2026 |
| Digital Avenue Prime Ltd | Wholesale & retail | 2026 |
| Digital Axes Limited | Wholesale & retail | 2022 |
| Digital Bear Limited | Information & communication | 2018 |
| Digital Commerce & Strategy Ltd | Wholesale & retail | 2026 |
| Digital Dealings Ltd | Wholesale & retail | 2024 |
| Digital Discovery Ltd | Professional & scientific | 2020 |
| Digital Dog Design Limited | Professional & scientific | 2026 |
| Digital Dream Solution Ltd | Wholesale & retail | 2025 |
| Digital Facing Ltd | Information & communication | 2022 |
| Digital Growth by SK Limited | Professional & scientific | 2024 |
| Digital Highway Limited | Information & communication | 1994 |
| Digital Hunt Ltd | Information & communication | 2021 |
| Digital Internet Limited | Information & communication | 2007 |
| Digital Media Experts Limited | Hospitality | 2014 |
| Digital Nexuz Ltd | Wholesale & retail | 2024 |
| Digital Stock Supplies Ltd | Wholesale & retail | 2015 |
| Digital Vending Ltd | Wholesale & retail | 2025 |
| Digitalife Limited | Information & communication | 1996 |
| Digitall Aerial & Satellites Ltd | Information & communication | 2011 |
| Digitall Comms Limited | Information & communication | 2013 |
| Digitech Creative Source Limited | Information & communication | 2023 |
| Digitex Ventures Ltd | Wholesale & retail | 2025 |
| Digitools Ltd | Wholesale & retail | 2023 |
| Dignity Hands Ltd | Health & social care | 2016 |
| Dilbag Cloth House Limited | Wholesale & retail | 1993 |
| Dilligaf International Ltd | Transport & logistics | 2024 |
| Dilpassand Foods Limited | Hospitality | 2017 |
| Dimac Autos Ltd | Other services | 2017 |
| Dimension Business Solutions Limited | Information & communication | 2003 |
| Dimensional Stone Sales Limited | Manufacturing | 2021 |
| Dimj Contractors Ltd | Construction | 2022 |
| DIN Trading Services Ltd | Other services | 2018 |
| Dina Zarina Ltd | Health & social care | 2014 |
| Dinaz Investments Ltd | Real estate | 2023 |
| Dindingwe Advisory Services International Limited | Financial services | 2022 |
| Dinho Ltd | Administrative & support | 2025 |
| Dinsdales Estates (Property Management) Limited | Real estate | 2017 |
| DIO Electrical Ltd | Manufacturing | 2023 |
| Direct Building Products Limited | Wholesale & retail | 2006 |
| Direct Car Hire Ltd | Administrative & support | 2021 |
| Direct Care U.K. Ltd | Other services | 2021 |
| Direct Carz Ltd | Wholesale & retail | 2020 |
| Direct Deal Yorkshire Ltd | Wholesale & retail | 2017 |
| Direct Deliveries (BFD) Ltd | Hospitality | 2025 |
| Direct Discount Limited | Wholesale & retail | 2017 |
| Direct Home Care 365 Limited | Health & social care | 2023 |
| Direct Home Suppliers Ltd | Wholesale & retail | 2024 |
| Direct Immigration Ltd | Professional & scientific | 2021 |
| Direct Investment Solutions Ltd | Administrative & support | 2014 |
| Direct Logistics 247 Limited | Transport & logistics | 2024 |
| Direct Property Holdings Limited | Real estate | 2020 |
| Direct Property Sales and Lettings Limited | Real estate | 2015 |
| Direct Roofing & Building NE Limited | Construction | 2024 |
| Direct Sims Ltd | Wholesale & retail | 2017 |
| Direct Trade Signs Ltd | Manufacturing | 2025 |
| Direct Trading Technologies UK Limited | Financial services | 2017 |
| Direct Van Rental Limited | Transport & logistics | 2016 |
| Direct Vehicles Ltd | Wholesale & retail | 2021 |
| Directfleet Limited | Construction | 1993 |
| Dirilis Yorkshire Limited | Hospitality | 2019 |
| Dirk Carr Farm Developments Ltd | Construction | 2024 |
| Dirkhill Motors Ltd | Wholesale & retail | 2022 |
| Dirosa Consulting Limited | Education | 2018 |
| Dirt Bags Ltd | Water & waste | 2007 |
| Dirty Dawgs Hot Dog Limited | Hospitality | 2021 |
| Disaster Medicine Limited | Professional & scientific | 2023 |
| Discontoys Limited | Wholesale & retail | 2013 |