| Dine Transport Limited | Transport & logistics | 2017 |
| Ding Property Management Ltd | Real estate | 2020 |
| Dino Trans Ltd | Transport & logistics | 2024 |
| Dinsdale Group Limited | Extraterritorial | 2017 |
| Diode Plasmids Ltd | Manufacturing | 2025 |
| Diometer Limited | Information & communication | 2017 |
| Diplomatika Ltd | Education | 2025 |
| Direct and Nationwide Sameday Limited | Transport & logistics | 2017 |
| Direct Boiler Services Ltd | Construction | 2020 |
| Direct Business Ltd | Wholesale & retail | 2023 |
| Direct Ferries (Group) Limited | Professional & scientific | 2014 |
| Direct Ferries (Holdings) Ltd | Professional & scientific | 2007 |
| Direct Ferries Limited | Transport & logistics | 1999 |
| Direct HIT Media Limited | Professional & scientific | 2020 |
| Direct Plastering Solutions Ltd | Construction | 2018 |
| Direct Recruiters Ltd | Administrative & support | 2019 |
| Direct Travel Services Ltd | Administrative & support | 2016 |
| DIS (East Anglia) Limited | Wholesale & retail | 1998 |
| DIS Hoses, Clips and Connectors Limited | Financial services | 2021 |
| Disabled Identification Card Limited | Other services | 2014 |
| Disabled Students UK CIC | Education | 2021 |
| Discount Leisure Products Limited | Wholesale & retail | 2015 |
| Discovery Bay Properties Ltd | Real estate | 2020 |
| Discovery Digital Ventures Ltd. | Information & communication | 2022 |
| Discovery Machines Ltd | Professional & scientific | 2024 |
| Dismantle Initiative Ltd | Professional & scientific | 2023 |
| Disposables & Catering Supplies Limited | Wholesale & retail | 1999 |
| Disrupt Recruitment & Search Ltd | Administrative & support | 2025 |
| Distag Holdings Ltd | Wholesale & retail | 1998 |
| Distilled Republik Ipswich Ltd | Hospitality | 2017 |
| Diva Gold Ltd | Wholesale & retail | 2022 |
| Dive Systems Limited | Professional & scientific | 2012 |
| Diveline (Medical) Limited | Manufacturing | 2005 |
| Divine-Lake 44 Ltd | Health & social care | 2016 |
| Division Blue Ltd | Hospitality | 2026 |
| Division Recruitment Limited | Administrative & support | 2020 |
| Dixons Properties Limited | Real estate | 1997 |
| DIY With Emma Ltd | Information & communication | 2023 |
| Diya Healthcare Solutions Ltd | Health & social care | 2022 |
| Dizzy Supps Ltd | Wholesale & retail | 2025 |
| DJ Contract Plumbing Ltd | Construction | 2017 |
| DJ Scott Dewing Ltd | Arts & recreation | 2022 |
| Djalam Ltd | Wholesale & retail | 2022 |
| DJC Commercials Ltd | Wholesale & retail | 2023 |
| DJF Airport and ATC Consultancy Limited | Professional & scientific | 2022 |
| DJR Leggett Ltd | Construction | 2025 |
| Djsc Limited | Professional & scientific | 2022 |
| DK Construction Group Ltd | Construction | 2026 |
| DK Unique Ltd | Manufacturing | 2025 |
| Dk&F Limited | Transport & logistics | 2015 |
| DK9 Security Limited | Administrative & support | 2010 |
| DK9 Specialist Search Unit C.I.C. | Professional & scientific | 2024 |
| DKB Group Ltd | Information & communication | 2026 |
| DKB Traffic Systems Ltd | Construction | 2017 |
| Dkjr Engineering Ltd | Manufacturing | 2016 |
| DKL Solutions Limited | Education | 2014 |
| Dkny Holdings Limited | Financial services | 2026 |
| DKV Services Ltd | Wholesale & retail | 2024 |
| DL Properties Ltd | Real estate | 2024 |
| DLH Turbo Diesel Limited | Wholesale & retail | 2016 |
| DLM HR Solutions Ltd | Administrative & support | 2018 |
| Dlrav Ltd | Information & communication | 2021 |
| DLS Transport Ltd | Transport & logistics | 2021 |
| DLY Limited | Construction | 2017 |
| DM Betea Ltd | Wholesale & retail | 2026 |
| DM Healthcare Limited | Real estate | 2021 |
| DM Holdco 5 Limited | Real estate | 2024 |
| DM Lettings and Property Management Ltd | Real estate | 2020 |
| DM Removals Ltd | Transport & logistics | 2026 |
| DMB Automotive Ltd | Wholesale & retail | 2014 |
| DMD Accommodation Services Ltd | Hospitality | 2021 |
| DMD Electrical & Solar Ltd | Construction | 2025 |
| DML Projects Ltd | Construction | 2020 |
| DMN UTD Ltd | Construction | 2022 |
| DMR 365 Ltd | Administrative & support | 2024 |
| DMT Models Ltd | Wholesale & retail | 2019 |
| DN Fibre Solutions Ltd | Wholesale & retail | 2018 |
| DNA Personal Trainers Ltd | Other services | 2013 |
| DNF Property Investments Limited | Real estate | 2017 |
| Dobbyman Ltd | Wholesale & retail | 2002 |
| Doc/Resolve Ltd. | Construction | 2017 |
| Dock Street Creative Productions Ltd | Professional & scientific | 2017 |
| Dodnash Books Ltd | Information & communication | 2018 |
| Dodnash Fruit Farm (Housing) Limited | Real estate | 2016 |
| Dog Copenhagen Limited | Wholesale & retail | 2021 |
| Dog Food Company Ltd | Manufacturing | 2012 |
| Dog Training for Essex & Suffolk Limited | Administrative & support | 2008 |
| Dogpools Inc Ltd | Manufacturing | 2020 |
| Doko Foods & Goods Global Supply Consultant Ltd | Wholesale & retail | 2026 |
| Dollar Developments Limited | Construction | 2019 |
| Dollar Operations Limited | Health & social care | 2019 |
| Dollie Mixtures Childcare Ltd | Health & social care | 2012 |
| Dolphin F&C Ltd | Wholesale & retail | 2018 |
| Dolphin Pools Ltd | Other services | 2022 |
| Dolsi TM Ltd | Construction | 2024 |
| Domestika Limited | Professional & scientific | 2018 |
| Domextra Water Softeners Limited | Manufacturing | 1992 |
| Domi & ANA Magazin Ltd | Wholesale & retail | 2025 |
| Domore Systems Limited | Information & communication | 2026 |
| Donadi Constraction Group Ltd | Construction | 2025 |