| Dixon Davis Estates Limited | Real estate | 2018 |
| Dixon Deer Management Ltd | Agriculture & fishing | 2025 |
| Dixon Engineering Supplies Limited | Wholesale & retail | 2019 |
| Dixon's Golf Limited | Wholesale & retail | 2023 |
| Dixon-Briggs Property Ltd | Real estate | 2025 |
| Dixons Industrial Holdings 2 Limited | Real estate | 2017 |
| Dixons Industrial Holdings 3 Limited | Real estate | 2018 |
| Dixons Industrial Holdings 4 Limited | Real estate | 2018 |
| Dixons Industrial Holdings 5 Limited | Financial services | 2020 |
| Dixons Industrial Holdings Limited | Real estate | 2015 |
| Dixons Northern Industrial Holdings Limited | Real estate | 2017 |
| Dixy Chicken Limited | Hospitality | 2018 |
| DIY 360 Ltd | Construction | 2025 |
| DIY Ceilidh Ltd | Arts & recreation | 2024 |
| DIY Decking & Artificial Grass Ltd | Wholesale & retail | 2019 |
| Diya(Newcastle) Limited | Hospitality | 2017 |
| Diyar Auto Cars Limited | Wholesale & retail | 2026 |
| DJ Care Group Limited | Professional & scientific | 2025 |
| DJ Fragrance Distribution Ltd | Wholesale & retail | 2025 |
| DJ Harris Property Limited | Real estate | 2015 |
| Dj&B Group Ltd | Manufacturing | 2016 |
| DJC Environmental Limited | Professional & scientific | 2023 |
| DJE Plumbing Ltd | Wholesale & retail | 2025 |
| DJF Contracting Ltd | Other services | 2021 |
| Djmh Financial Services Ltd | Financial services | 2022 |
| Djmw Legal Limited | Professional & scientific | 2018 |
| DJR Health & Safety Ltd | Construction | 2020 |
| DJS Access Specialist Ltd | Extraterritorial | 2025 |
| DJS Auto Electrics Limited | Other services | 1995 |
| DK Plastic Surgery Ltd | Health & social care | 2024 |
| DK Travel Deluxe Ltd | Administrative & support | 2024 |
| Dk-Bi Ltd | Information & communication | 2026 |
| Dkane Electrical Limited | Manufacturing | 2019 |
| Dkcsc Ltd | Professional & scientific | 2013 |
| DKD Property NE Ltd | Construction | 2026 |
| DKJ Motors Ltd | Wholesale & retail | 2026 |
| DKV Holdings Limited | Real estate | 2019 |
| DL Electrics Limited | Construction | 2016 |
| DL Renewables Ltd | Administrative & support | 2026 |
| DLC Fitness Ltd | Wholesale & retail | 2021 |
| DLC Properties NE Limited | Real estate | 2016 |
| DLJ Developments Ltd | Construction | 2021 |
| DLM Fabrications Limited | Manufacturing | 2018 |
| DLM Safety Solutions Ltd | Other services | 2023 |
| DLT Management NE Ltd | Professional & scientific | 2025 |
| DM Courier & Transport Ltd | Transport & logistics | 2021 |
| DM Digital UK Services Ltd | Information & communication | 2026 |
| DM Electricals NE Ltd | Construction | 2026 |
| DM Estimating Ltd | Construction | 2024 |
| Dmak & Sons Limited | Manufacturing | 2025 |
| DMC Civil Solutions Ltd | Construction | 2018 |
| DMC Construction and Groundworks Ltd | Construction | 2025 |
| DMC MOT Centre Ltd | Wholesale & retail | 2004 |
| DMD Lighting Limited | Construction | 2018 |
| DMD Offshore Ltd | Professional & scientific | 2025 |
| DME Fibre Offshore Ltd | Construction | 2023 |
| DMG Property Hub Ltd | Households | 2024 |
| DMH Healthcare Limited | Health & social care | 2006 |
| DMH Newcastle Limited | Real estate | 2022 |
| DMT Maintenance Engineering Services Limited | Construction | 2012 |
| DMV (CT) Limited | Financial services | 2023 |
| DMV (RJ) Limited | Financial services | 2023 |
| DMZ IT Solutions Limited | Professional & scientific | 2009 |
| DNA Commercial Cleaning Ltd | Administrative & support | 2025 |
| DNL Models Ltd | Wholesale & retail | 2024 |
| DNS KAR Help Limited | Wholesale & retail | 2023 |
| Dnta Associate Ltd | Health & social care | 2016 |
| DO3E Ltd | Wholesale & retail | 2025 |
| Doabe Wale Enterprise Limited | Wholesale & retail | 2025 |
| Doabe Wale Limited | Hospitality | 2024 |
| Dobermans Limited | Real estate | 1954 |
| Dobson and Parnell Limited | Hospitality | 2015 |
| Dobson Health Limited | Wholesale & retail | 2025 |
| Dobsons Direct Limited | Real estate | 2011 |
| Docendo Discimus Limited | Real estate | 2020 |
| Docgreen Ltd | Health & social care | 2015 |
| Dockendale Hall Freehold Ltd | Households | 2021 |
| Docklands Buses Limited | Professional & scientific | 1997 |
| Doctor Michael Frain Limited | Health & social care | 2008 |
| Doctor Will's Ltd | Manufacturing | 2016 |
| Document Solutions (West) Limited | Administrative & support | 2021 |
| Docyoumentary Films Ltd | Information & communication | 2013 |
| Dog and Scone Limited | Hospitality | 2016 |
| Dog Leap Boots Limited | Manufacturing | 2020 |
| Dog on the Tyne Ltd | Wholesale & retail | 2026 |
| Dog Pepper Media Limited | Administrative & support | 2015 |
| Dog Pepper Transport Ltd | Transport & logistics | 2018 |
| Dogan Italian Food Ltd | Hospitality | 2020 |
| Doggone Vacation Limited | Agriculture & fishing | 2003 |
| Dogs' Day Retreat Limited | Other services | 2014 |
| DOH Consultancy Limited | Wholesale & retail | 2026 |
| Doherty Subsea Services Ltd | Professional & scientific | 2022 |
| Doli Events Ltd | Administrative & support | 2016 |
| Dolls Tanning Gateshead Limited | Other services | 2024 |
| Dolls Tanning Kenton Limited | Other services | 2024 |
| Dolls Tanning Limited | Other services | 2020 |
| Dolls Tanning Wallsend Limited | Other services | 2024 |
| Dolphin Holiday Homes Ltd | Hospitality | 2025 |
| Dolphin Homes Newcastle Ltd | Wholesale & retail | 2021 |
| Dolsen Consulting Limited | Information & communication | 2023 |