| Dhiyo Vero Limited | Manufacturing | 2026 |
| DHM Trading Ltd | Wholesale & retail | 2026 |
| Dhother Transport Ltd | Transport & logistics | 2013 |
| Dhwaj Solutions Limited | Information & communication | 2021 |
| DI Belleza Ltd | Wholesale & retail | 2021 |
| DI Cake Studio Limited | Manufacturing | 2022 |
| Dialogue HR Ltd | Information & communication | 2025 |
| Diamond Cars Transfers Ltd | Transport & logistics | 2026 |
| Diamond Chemistry Ltd | Wholesale & retail | 2024 |
| Diamond Citi Investments Ltd | Real estate | 2024 |
| Diamond CUT Trading Ltd | Wholesale & retail | 2017 |
| Diamond Drinks Limited | Wholesale & retail | 2014 |
| Diamond Hair & Beauty Limited | Other services | 2017 |
| Diamond Haulage Limited | Transport & logistics | 2016 |
| Diamond Investment Enterprises Limited | Real estate | 2022 |
| Diamond Jubilee Enterprises Ltd | Wholesale & retail | 2017 |
| Diamond Selection Group Holdings Limited | Professional & scientific | 1999 |
| Diamond Sweeps Ltd | Administrative & support | 2025 |
| Diamondair International Limited | Professional & scientific | 2001 |
| Diamondblue Group Limited | Professional & scientific | 2015 |
| Didcon Industries Ltd | Manufacturing | 2022 |
| Diden Ventures Limited | Professional & scientific | 2008 |
| Didi London Chauffeur Ltd | Transport & logistics | 2026 |
| Digi Bites Solutions Ltd | Wholesale & retail | 2018 |
| Digi Dragonfly Limited | Information & communication | 2011 |
| Digifix IT Limited | Information & communication | 2015 |
| Digipay Global Ltd | Administrative & support | 2025 |
| Digital Cloud Estate Limited | Real estate | 2025 |
| Digital Cloud Force Ltd | Information & communication | 2021 |
| Digital EYE Security Systems Ltd | Other services | 2014 |
| Digital Impact Advisory Ltd | Information & communication | 2026 |
| Digital Marketiers Ltd | Information & communication | 2019 |
| Digital Software Limited | Information & communication | 2014 |
| Digital Today Ltd | Administrative & support | 2018 |
| Digitalgb Ltd | Information & communication | 2022 |
| Digitalis Office Services Ltd | Administrative & support | 2011 |
| Digitalise Hub Ltd | Information & communication | 2026 |
| Digizol Limited | Administrative & support | 2023 |
| Dijomaa Limited | Health & social care | 2022 |
| DIL2 Limited | Wholesale & retail | 2023 |
| Dilbag Transport Limited | Transport & logistics | 2016 |
| Dilp Limited | Information & communication | 2025 |
| Dilraj Sraa Limited | Transport & logistics | 2025 |
| Dilveen Properties Limited | Households | 2019 |
| Dimension Building Contractors Limited | Construction | 2016 |
| Dineet Investment Limited | Real estate | 2026 |
| Dione Traders Ltd | Construction | 2019 |
| Direct Dealers Ltd | Wholesale & retail | 2019 |
| Direct Rent Marketplace Ltd | Information & communication | 2026 |
| Direct Rider Limited | Transport & logistics | 2023 |
| Direct Staff Solution Ltd | Administrative & support | 2019 |
| Direction Investment Ltd | Real estate | 2021 |
| Dirichlet-Cross Limited | Real estate | 2010 |
| Disa Cleaning Services Ltd | Administrative & support | 2024 |
| Disa Global Ltd | Other services | 2022 |
| Disability Network Hounslow | Other services | 2002 |
| Discounted Price London Ltd | Wholesale & retail | 2026 |
| Disha Limited | Information & communication | 2020 |
| Distilled Talent Ltd | Administrative & support | 2025 |
| Disu Healthcare Ltd | Health & social care | 2019 |
| DIT Direct Ltd | Construction | 2023 |
| Diverse Homes Limited | Real estate | 2006 |
| Diversity Workout Limited | Arts & recreation | 2025 |
| Divine Delicacies Limited | Hospitality | 2021 |
| Divine Dream Events Ltd | Hospitality | 2024 |
| Divine Dwellings Private Limited | Real estate | 2024 |
| Divine Hospitality Limited | Hospitality | 2024 |
| Divine Touch Studio Ltd | Other services | 2025 |
| Diyon Enterprise Ltd | Wholesale & retail | 2025 |
| Dizzzy Bites Limited | Hospitality | 2024 |
| DJ Mobilez Limited | Wholesale & retail | 2018 |
| DJ Shaun Ltd | Information & communication | 2024 |
| Dj:Vek Ltd | Arts & recreation | 2022 |
| DK Building & Construction Ltd | Construction | 2026 |
| DK1 Builders Ltd | Construction | 2024 |
| DKB Properties Ltd | Real estate | 2017 |
| DKB Services Ltd | Information & communication | 2016 |
| DKH Investment (Cranford) Limited | Real estate | 2016 |
| DKH Management Limited | Real estate | 2015 |
| Dklutur Ltd | Information & communication | 2025 |
| DL Events Management Limited | Hospitality | 2022 |
| DL IT Consulting Limited | Information & communication | 2026 |
| DLF Investments Ltd | Real estate | 2024 |
| Dlft Limited | Administrative & support | 2026 |
| Dlocum Limited | Health & social care | 2009 |
| DLS Drylining Ltd | Construction | 2024 |
| Dmag International Properties (UK) Limited | Real estate | 2026 |
| Dmak Ltd | Construction | 2014 |
| DMG Trade Ltd | Construction | 2019 |
| DMM International PVT Ltd | Wholesale & retail | 2022 |
| DMN Cares Ltd | Health & social care | 2019 |
| DMS Solutions Ltd | Professional & scientific | 2018 |
| DNA Global Staffing Limited | Administrative & support | 2026 |
| DNH Autos Ltd | Manufacturing | 2011 |
| Dnrr Ltd | Hospitality | 2025 |
| Dntek IT Solutions Ltd | Information & communication | 2025 |
| DO & Co Airline Catering Limited | Hospitality | 2018 |
| DO & Co Airport Gastronomy Limited | Professional & scientific | 2013 |
| DO & Co Airport Hospitality UK Limited | Hospitality | 2013 |
| DO & Co Cafe UK Ltd. | Hospitality | 2015 |