| DEW Springs Limited | Health & social care | 2025 |
| DFA Consulting Services Limited | Professional & scientific | 2025 |
| Dfaj Property Limited | Real estate | 2017 |
| Dfaj Property Management Limited | Real estate | 2018 |
| Dfem Ventures Ltd | Wholesale & retail | 2025 |
| DG Maidenhead Holdings Limited | Real estate | 2020 |
| DGE Investments UK Ltd | Construction | 2022 |
| DGM Electrical Solutions Ltd | Construction | 2023 |
| DGP Contracting Limited | Water & waste | 2013 |
| DGT Services Limited | Manufacturing | 1998 |
| Dhewy Ltd | Information & communication | 2016 |
| DHL Parcel Express Ltd | Transport & logistics | 2020 |
| DHS Rentals Limited | Real estate | 2025 |
| Dhwani Consulting Ltd | Information & communication | 2017 |
| DI JU Gym Limited | Arts & recreation | 2024 |
| Diamond Court Management Company (Hornchurch) Limited | Households | 1993 |
| Diamond Holiday Lettings Hemsby Ltd | Hospitality | 2020 |
| Diamond Shine Deluxe Limited | Administrative & support | 2025 |
| Diamondvalue Coaching Limited | Education | 2013 |
| Dickens Builders Limited | Construction | 2024 |
| Dickinson Civil Engineering Limited | Construction | 2018 |
| Diebelius PMU Limited | Other services | 2020 |
| Diesel Alert LLP | | 2010 |
| Dietex International Limited | Manufacturing | 2001 |
| Difinitive Squirrel Limited | Financial services | 2022 |
| DIG 4 U Ltd | Construction | 2020 |
| Digatech Media Ltd | Information & communication | 2019 |
| Digger-Direct UK Ltd | Administrative & support | 2024 |
| Diggers N Dumpers Ltd | Wholesale & retail | 2016 |
| Digiblu UK Limited | Information & communication | 2019 |
| Digital Cloud Limited | Information & communication | 2018 |
| Digital Eskills Hub Ltd. | Agriculture & fishing | 2016 |
| Digital EYE Events Ltd | Information & communication | 2023 |
| Digital Graphics Limited | Arts & recreation | 2015 |
| Digital Histopathology Slide Scanning Service Ltd | Health & social care | 2021 |
| Digital Innovation Services Ltd | Professional & scientific | 2025 |
| Digital Media Solutions Ltd | Information & communication | 2023 |
| Digital Novation Ltd | Professional & scientific | 2025 |
| Digital Transformers Group Limited | Information & communication | 2025 |
| Digress Limited | Real estate | 2001 |
| Dimond Services Ltd | Professional & scientific | 2025 |
| Dino Legal Consultancy Ltd | Professional & scientific | 2025 |
| Dino Real Estate Limited | Real estate | 2022 |
| Dipping Hollow Limited | Construction | 2004 |
| Diptank Limited | Professional & scientific | 2019 |
| Direct and Life Home Finance Advice Limited | Financial services | 2023 |
| Direct Commercial Limited | Financial services | 1995 |
| Direct Commercial Premium Finance Limited | Financial services | 2026 |
| Direct Design (Eastwick Barns) Limited | Manufacturing | 2022 |
| Direct Digital Print Limited | Manufacturing | 2005 |
| Direct Educational Consultancy Limited | Education | 2024 |
| Direct Fleet Care (U.K.) Limited | Real estate | 1996 |
| Direct Vision (UK) Holdings Ltd | Financial services | 2025 |
| Directa (UK) Holdings Ltd | Administrative & support | 2010 |
| Direksiyon Ltd | Hospitality | 2025 |
| Dirt Studio Ltd | Arts & recreation | 2013 |
| Disclosure Consultancy Group Limited | Information & communication | 2019 |
| Discreet Property Partners Limited | Construction | 2020 |
| Disha Beauty Limited | Other services | 2023 |
| Distinctive Favour Ltd | Professional & scientific | 2016 |
| Distinctive Signs Limited | Manufacturing | 2010 |
| Distinto Diferente Limited | Financial services | 2021 |
| Distrim Investments Limited | Financial services | 1988 |
| DIT Consultants Ltd | Professional & scientific | 2016 |
| Divas Housing Ltd | Real estate | 2020 |
| Diverse Talent Management Limited | Other services | 2024 |
| Divine Bride Limited | Wholesale & retail | 2000 |
| Divine Confections Limited | Wholesale & retail | 2023 |
| Divine Consultants Limited | Health & social care | 2008 |
| Divis SPV 2022 Limited | Real estate | 2022 |
| Dixon JL Limited | Professional & scientific | 2021 |
| Dixon Securities Ltd | Real estate | 2021 |
| Diyama Apparel Ltd | Manufacturing | 2025 |
| Diyama Properties Ltd | Real estate | 2021 |
| DJ Barron Plumbing & Heating Limited | Construction | 2017 |
| Djbusiness Ltd | Wholesale & retail | 2024 |
| DJF Developments Limited | Construction | 2023 |
| DJK Associates Ltd | Professional & scientific | 2023 |
| DJL Andersen Ltd | Real estate | 2024 |
| Djpd Ltd | Construction | 2016 |
| DJW Scaffolding Ltd | Construction | 2020 |
| Dkdab Limited | Information & communication | 2019 |
| DKS Business Ltd | Real estate | 2020 |
| DKX Trading Limited | Information & communication | 2018 |
| DL Property Limited | Extraterritorial | 2015 |
| DLM Solutions Ltd | Administrative & support | 2025 |
| DLR Property Developers Limited | Real estate | 2023 |
| DLS Vehicle Sales Ltd | Wholesale & retail | 2023 |
| DMA Takeaway Ltd | Hospitality | 2021 |
| DMC Aligntech Limited | Real estate | 2023 |
| DMD Imperial Ltd | Construction | 2019 |
| DMH Homes Limited | Real estate | 2020 |
| Dmontrio Limited | Hospitality | 2026 |
| DMP Consultancy Limited | Transport & logistics | 2018 |
| DMR Building Consultancy Ltd | Other services | 2024 |
| DMT Recruitment Ltd | Construction | 2019 |
| DNC Roofing and Construction Ltd | Construction | 2025 |
| DNJ Contract Supplies Ltd | Professional & scientific | 2018 |
| Dntcm LLP | | 2023 |
| Doandes Transport Ltd | Transport & logistics | 2025 |