| Direct Cladding Access & Maintenance Ltd | Construction | 2025 |
| Direct Door Closers Ltd | Wholesale & retail | 2024 |
| Direct Joinery Solutions Ltd | Construction | 2017 |
| Direct Labour Solutions Limited | Administrative & support | 2016 |
| Direct Smart Home Limited | Administrative & support | 2002 |
| Disclosed Ltd | Professional & scientific | 2016 |
| Disco Ropes Ltd | Construction | 2025 |
| Discount D.I.Y. Limited | Wholesale & retail | 2001 |
| Discount DIY Holdings Ltd | Financial services | 2021 |
| Discount Properties Limited | Professional & scientific | 1997 |
| Discount Rubbish NE Limited | Water & waste | 2025 |
| Discovery Construction Ltd | Construction | 2025 |
| Discovery Construction NE Ltd | Construction | 2019 |
| Distinkt Group Limited | Financial services | 2026 |
| Distinkt Kitchens Ltd | Construction | 2021 |
| Ditchfield Dental Ltd | Health & social care | 2006 |
| Diverge Fire and Security Ltd | Administrative & support | 2023 |
| Diverse Works Hub Limited | Education | 2020 |
| Divine Hair UK Ltd | Other services | 2025 |
| Divine Healthcare & Support Ltd | Health & social care | 2025 |
| Divine Logistics Private Ltd | Wholesale & retail | 2025 |
| Divino Interiors Ltd | Wholesale & retail | 2023 |
| Divjules Education Services Limited | Professional & scientific | 2026 |
| DIY World Limited | Wholesale & retail | 2011 |
| DJ Green Engineering Services Limited | Professional & scientific | 2013 |
| DJ Scott Radiology Services Limited | Health & social care | 2013 |
| Djan 777 Ltd | Transport & logistics | 2019 |
| DJB Instrument Services Limited | Professional & scientific | 2022 |
| DJB Motors Company Limited | Wholesale & retail | 2025 |
| DJC Elec Serv Ltd | Construction | 2025 |
| DJG Civils Limited | Construction | 2025 |
| DJK Engineering Ltd | Professional & scientific | 2023 |
| DJK Property Management Ltd | Real estate | 2019 |
| DJL Welding Services Ltd | Manufacturing | 2026 |
| DJM Aerial Solutions Limited | Professional & scientific | 2017 |
| DJM Engineering Services Ltd | Administrative & support | 2022 |
| DJN Access Limited | Construction | 2019 |
| DJR Joinery Ltd | Construction | 2026 |
| DJR2003 Ltd | Information & communication | 2023 |
| DJS Rigging Services Ltd | Construction | 2026 |
| DK Heating Ltd | Construction | 2024 |
| Dk-Mac Solutions Limited | Construction | 2025 |
| DKG Inspection Ltd | Professional & scientific | 2023 |
| DKM Standard Limited | Health & social care | 2024 |
| DKS North East Ltd | Professional & scientific | 2017 |
| DL Commissioning & Operations Ltd | Professional & scientific | 2026 |
| DL Property Maintenance Ltd | Construction | 2023 |
| DL2 Auctions Limited | Wholesale & retail | 2018 |
| Dlbsafetyconsultancy Ltd | Public administration | 2026 |
| DLC Groundwork Limited | Construction | 2018 |
| Dleweldingservices Ltd | Professional & scientific | 2019 |
| DLH Services NE Limited | Professional & scientific | 2019 |
| DLM Capital Group Ltd | Financial services | 2024 |
| DLM Fibre Ltd | Construction | 2023 |
| DLW Project Solutions Ltd | Construction | 2026 |
| Dlwh Locum Ltd | Wholesale & retail | 2024 |
| DM Electrical Services NE Ltd | Construction | 2025 |
| DM Inst Services Limited | Professional & scientific | 2024 |
| DM Removals and Waste Services Ltd | Water & waste | 2024 |
| DM Supplies (NE) Limited | Wholesale & retail | 2016 |
| Dmcorp Ltd | Information & communication | 2026 |
| Dmdj Ltd | Professional & scientific | 2024 |
| DME Online Ltd | Wholesale & retail | 2012 |
| Dmees Limited | Professional & scientific | 2011 |
| DMF Rail Limited | Construction | 2017 |
| Dmfa Ltd | Professional & scientific | 2009 |
| DMH Plumbing and Heating Ltd | Administrative & support | 2016 |
| DML Sports Therapy Ltd | Other services | 2026 |
| Dmlj Professional Engineering Limited | Professional & scientific | 2023 |
| Dmog Ltd | Professional & scientific | 1998 |
| DMR Rental Properties Ltd | Real estate | 2023 |
| DMS Teesside Limited | Professional & scientific | 2016 |
| DN Energy Solutions Ltd | Professional & scientific | 2021 |
| DN Joinery & Bathrooms Ltd | Administrative & support | 2017 |
| DNA Bathrooms Limited | Wholesale & retail | 2018 |
| DNA PR & Publicity Limited | Professional & scientific | 2014 |
| DNA Watersports Ltd | Wholesale & retail | 2024 |
| Dnes Limited | Professional & scientific | 2021 |
| Dobbies Abnormal Load Escorting Services Ltd | Extraterritorial | 2022 |
| Doctor BIM Ltd | Professional & scientific | 2024 |
| Dodds & Co Legal Services Ltd | Professional & scientific | 2022 |
| Dog Box Games Ltd | Manufacturing | 2021 |
| Dogwarts Daycare Ltd | Extraterritorial | 2024 |
| DOH Meza Ltd | Hospitality | 2025 |
| Dohan Foods Limited | Wholesale & retail | 2025 |
| Doja Enterprise Ltd | Wholesale & retail | 2024 |
| Dokocomm Ltd | Information & communication | 2011 |
| Dolled by Jessi Ltd | Other services | 2026 |
| Dolly’S Sweet Shop Ltd. | Wholesale & retail | 2020 |
| Dolmen Development UK Ltd | Construction | 2020 |
| Dominiak Studio Limited | Other services | 2003 |
| Dominic Simms Logistics Ltd | Transport & logistics | 2025 |
| Domo MEA Limited | Real estate | 2024 |
| Domov Ltd | Real estate | 2024 |
| DON 2022 Ltd | Hospitality | 2022 |
| Donal Mason LLP | | 2025 |
| Donal Mason Plant Limited | Construction | 2017 |
| Donaldson R/A Insulation Ltd | Construction | 2024 |
| Done 'N' Dusted Cleaning Ltd | Administrative & support | 2009 |
| Done N Dusted Commercial Cleaning Ltd | Administrative & support | 2024 |