| Devsparkle Ltd | Wholesale & retail | 2018 |
| Dewan Investments Limited | Real estate | 2025 |
| Dexior Limited | Professional & scientific | 2019 |
| Dexone Consultants Ltd | Professional & scientific | 2025 |
| Deycorp Ltd | Financial services | 2020 |
| DFD T/S J S Dhariwal Limited | Transport & logistics | 2023 |
| DFT Telecom Limited | Information & communication | 2015 |
| DG Global Forwarding (UK) Ltd | Transport & logistics | 2011 |
| DG Packaging (UK) Ltd | Manufacturing | 2011 |
| DG Tech Solution Limited | Professional & scientific | 2012 |
| DGM Accountancy Services Ltd | Professional & scientific | 2010 |
| DGM Leadership Solutions Ltd | Administrative & support | 2025 |
| DGP Admaston Limited | Professional & scientific | 2004 |
| DGP Asset Management Ltd | Real estate | 2004 |
| DGP Leegomery Limited | Real estate | 2006 |
| DGP Redwood Limited | Real estate | 2007 |
| DGR Homes Ltd | Construction | 2023 |
| DH Cars Limited | Wholesale & retail | 2020 |
| DH London Construction Limited | Construction | 2021 |
| Dhak Enterprises Limited | Real estate | 2010 |
| Dhaliwal Property Ltd | Real estate | 2016 |
| DHALIWAL22 Construction Ltd | Construction | 2023 |
| Dhami Service Ltd | Transport & logistics | 2025 |
| Dhandwar Investments 53ACL Ltd | Real estate | 2022 |
| Dhandwar Investments Ltd | Real estate | 2020 |
| Dhanishta Limited | Wholesale & retail | 2022 |
| Dhanjal Property Investment Ltd | Real estate | 2025 |
| Dhanju Services Ltd | Transport & logistics | 2025 |
| Dharam & Sons Investments Ltd | Real estate | 2019 |
| Dhardwar Trading Limited | Wholesale & retail | 2016 |
| Dhesi Ventures Limited | Real estate | 2023 |
| DHI Ashford Ltd | Real estate | 2026 |
| Dhillon B Construction Ltd | Construction | 2017 |
| Dhillon B Properties Ltd | Real estate | 2021 |
| Dhillon Brickwork Ltd | Construction | 2016 |
| Dhillon Cabs Ltd | Transport & logistics | 2023 |
| Dhillon Dreams Ltd | Hospitality | 2026 |
| Dhillon Electrical Ltd | Construction | 2020 |
| Dhillon Runners Limited | Transport & logistics | 2016 |
| Dhillon Scaffolding Limited | Construction | 2025 |
| Dhillon Solutions Limited | Information & communication | 2007 |
| Dhillon Trading Limited | Wholesale & retail | 2007 |
| Dhillon Transport London Ltd | Transport & logistics | 2025 |
| Dhillons D-Lights Ltd | Manufacturing | 2024 |
| DHL Management Services Limited | Administrative & support | 1986 |
| Dhol Distributions Limited | Other services | 2023 |
| Dhols of London Ltd | Arts & recreation | 2024 |
| DHP Home Services Limited | Real estate | 2024 |
| DHR Worldwide Ltd | Transport & logistics | 2019 |
| Dhsa Holdings Limited | Real estate | 2015 |
| Dhupar Limited | Construction | 2008 |
| DI Lusso Group Ltd | Hospitality | 2020 |
| DIA Fashion UK Ltd | Wholesale & retail | 2018 |
| Dial a Locum Ltd | Health & social care | 2019 |
| Dial Contracts Limited | Financial services | 1961 |
| Dial Vehicle Management Services Limited | Administrative & support | 1946 |
| Dialex Ltd | Construction | 2019 |
| Diamond Associate Services Ltd | Professional & scientific | 2023 |
| Diamond Autoworks Ltd | Wholesale & retail | 2022 |
| Diamond Bedroom & Kitchen Limited | Construction | 2017 |
| Diamond Care and Cleaning Ltd | Administrative & support | 2026 |
| Diamond Concept International Limited | Transport & logistics | 2019 |
| Diamond DCO One Limited | Professional & scientific | 1929 |
| Diamond Event Creations Ltd | Other services | 2015 |
| Diamond Goldfish Ltd | Real estate | 2019 |
| Diamond Motors Ltd | Wholesale & retail | 2026 |
| Diamond Nails Bar Slough Limited | Other services | 2024 |
| Diamond Paving (London) Limited | Construction | 2019 |
| Diamond Preschool Ltd | Education | 2014 |
| Diamond Roofing & Building Specialists Ltd | Construction | 2024 |
| Diamondkey Construction Limited | Construction | 2021 |
| Diamonds Nails Spa Ltd | Other services | 2025 |
| Diana Health Limited | Health & social care | 2020 |
| Diaspora Community Insights C.I.C. | Information & communication | 2026 |
| Didar Transport Limited | Transport & logistics | 2016 |
| Didi Services Ltd. | Transport & logistics | 2016 |
| DIG3RATI UK Limited | Information & communication | 2022 |
| Digi Estates Ltd | Information & communication | 2025 |
| Digigrowth Solutions Limited | Manufacturing | 2025 |
| Digihubcastle Ltd | Wholesale & retail | 2025 |
| Diginex Marketing Solutions Ltd | Administrative & support | 2023 |
| Digion Solutions Ltd | Information & communication | 2022 |
| Digisinc Ltd | Information & communication | 2014 |
| Digital Dandy Ltd | Professional & scientific | 2014 |
| Digital Genix Solutions Limited | Manufacturing | 2025 |
| Digital Growth Marketing Limited | Information & communication | 2026 |
| Digital Labs & Networks Limited | Information & communication | 2024 |
| Digital Marketing Academy Ltd | Education | 2018 |
| Digital Marketing Vibes Ltd | Information & communication | 2023 |
| Digital Mart Ltd | Wholesale & retail | 2024 |
| Digital Payment Ltd | Information & communication | 2025 |
| Digital Project and Management Ltd | Professional & scientific | 2013 |
| Digital Realtime Soft Solutions Limited | Information & communication | 2018 |
| Digital Reminder Ltd | Administrative & support | 2023 |
| Digital Thoughts (DT) Ltd | Information & communication | 2020 |
| Digital Webb Ltd | Information & communication | 2017 |
| Digitalflare Ltd | Information & communication | 2009 |
| Digitalisation Integrator Ltd | Information & communication | 2023 |
| Digitalq UK IT Solutions Ltd | Information & communication | 2021 |
| Digitaq Technologies Ltd | Information & communication | 2024 |