| Digital 365 Ltd | Professional & scientific | 2024 |
| Digital AGE Investment Holdings Limited | Financial services | 2019 |
| Digital Media Facilities Limited | Information & communication | 2021 |
| Digital Okapi Limited | Wholesale & retail | 2021 |
| Digital Unite Limited | Information & communication | 1997 |
| Dimboy Ltd | Construction | 2024 |
| Dimi Logistics Limited | Transport & logistics | 2019 |
| Dimond Consultants Limited | Professional & scientific | 2004 |
| Dingwall Lyons Ltd | Financial services | 2017 |
| Dingwall Specsavers Limited | Wholesale & retail | 2007 |
| Dingwall Visionplus Limited | Wholesale & retail | 2007 |
| Dipikaparmar Ltd | Health & social care | 2024 |
| Direct Aircraft Parts Ltd | Manufacturing | 2024 |
| Direct Home Rentals Ltd | Real estate | 2025 |
| DIS Holdings Limited | Financial services | 2025 |
| Dis-Play App Community Interest Company | Arts & recreation | 2013 |
| Disarmed Group Ltd | Extraterritorial | 2021 |
| Discount Landscaping Supplies Ltd | Professional & scientific | 2018 |
| Discover Networks Ltd | Information & communication | 2016 |
| Discovery Landscapes Ltd | Administrative & support | 2018 |
| Dispatches Magazine Publishing House Ltd | Wholesale & retail | 2025 |
| Diss Specsavers Limited | Wholesale & retail | 2009 |
| Diss Visionplus Limited | Wholesale & retail | 2009 |
| Distinguished Carriages Limited | Transport & logistics | 2016 |
| Distoni Ltd | Manufacturing | 2015 |
| Dive Safe Services Limited | Administrative & support | 2018 |
| Diverse Hair Design Ltd | Other services | 2010 |
| Dixon Aviation Limited | Professional & scientific | 2022 |
| Dizz Media Ltd | Information & communication | 2023 |
| DJF Enterprises Limited | Construction | 2022 |
| DJH Plumbing&Heating Ltd | Construction | 2024 |
| DJH Resourcing Ltd | Administrative & support | 2018 |
| DJL Medical Ltd | Health & social care | 2022 |
| DJL Repairs Ltd | Wholesale & retail | 2025 |
| DJN QS Services Limited | Professional & scientific | 2012 |
| DJP Conveyancing Limited | Professional & scientific | 2009 |
| DJS Consultancy Limited | Administrative & support | 2010 |
| DJS Moves Limited | Transport & logistics | 2025 |
| DJT Sourcing Ltd | Administrative & support | 2023 |
| DK Outlets Ltd | Wholesale & retail | 2025 |
| DKC Carpentry Limited | Manufacturing | 2021 |
| Dkrp Consulting Ltd | Information & communication | 2022 |
| DKW Sports Therapy Limited | Health & social care | 2017 |
| DL Holdings Limited | Wholesale & retail | 2015 |
| DL Mortgage & Protection Services Limited | Financial services | 2025 |
| DLB Pocket Properties Limited | Real estate | 2025 |
| DLC Private Hire Limited | Transport & logistics | 2014 |
| Dlec Electrical Limited | Construction | 2016 |
| Dlec Renewables Ltd | Energy | 2023 |
| DLG Electrical Contracting Ltd | Construction | 2021 |
| DLG Electrical Ltd | Construction | 2005 |
| DLG Property Investments Ltd | Real estate | 2025 |
| DLM Developments Limited | Construction | 2007 |
| DLM SPV Limited | Real estate | 2013 |
| DM Bell Limited | Hospitality | 2003 |
| DM Carpentry & Building Solutions Limited | Construction | 2021 |
| DMA Property Services (South) Ltd | Construction | 2023 |
| Dmac Global Management Ltd | Administrative & support | 2025 |
| DMB Carpentry Limited | Construction | 2002 |
| DMC Developments Limited | Construction | 2012 |
| DMC Sound Ltd | Information & communication | 2025 |
| DMC4 Tewkesbury Avenue Limited | Households | 2017 |
| DMT Marine Consultants Limited | Administrative & support | 2012 |
| DND Salisbury Ltd | Wholesale & retail | 2020 |
| DO IT Anyway Records Limited | Information & communication | 2025 |
| Doarnskii Ltd | Wholesale & retail | 2024 |
| Dobbin Morgan Limited | Professional & scientific | 2015 |
| Docdiamante Ltd | Education | 2022 |
| Doctor's Property Ltd | Real estate | 2019 |
| Doel Limited | Hospitality | 2017 |
| Dog Professor Limited | Education | 2020 |
| Doggy DEN Group Limited | Agriculture & fishing | 2025 |
| Doing Brave Productions Ltd | Information & communication | 2025 |
| DOJ Properties Ltd | Real estate | 2024 |
| Dolphin Boat Charter Ltd | Arts & recreation | 2016 |
| Dolphin House (PO13) RTM Company Limited | Households | 2024 |
| Dolphin Pursuits Ltd | Real estate | 2024 |
| Dolphin Tailoring & Embroidery Limited | Other services | 2024 |
| Domestic Electrician Ltd | Construction | 2018 |
| Dominic Reyes Magic Limited | Arts & recreation | 2006 |
| Dominic Richardson Ltd | Administrative & support | 2018 |
| DON Tonino Landscapes Ltd | Administrative & support | 2014 |
| Doodle Creates Ltd | Wholesale & retail | 2020 |
| Doodle Property Services Limited | Information & communication | 2014 |
| Dorchester Specsavers Hearcare Limited | Wholesale & retail | 2026 |
| Dorchester Specsavers Limited | Wholesale & retail | 2004 |
| Dorchester Visionplus Limited | Wholesale & retail | 2004 |
| Dorelbury Holdings Limited | Extraterritorial | 2020 |
| Dorelbury Limited | Construction | 1980 |
| Dorking Specsavers Limited | Wholesale & retail | 2001 |
| Dorothee Hall Tutoring Limited | Education | 2026 |
| DOT 2 DOT - Child and Family Psychology Ltd | Health & social care | 2025 |
| Double E Management & Transportation Company Limited | Transport & logistics | 2003 |
| Double Glazing Design Limited | Construction | 2010 |
| Douglas Construction Limited | Construction | 2002 |
| Douglas Knight Sunblinds Ltd | Manufacturing | 2001 |
| Dove Cottage Limited | Hospitality | 2013 |
| Dove Recycling Ltd | Extraterritorial | 2005 |
| Dovecoats Property Ltd | Administrative & support | 2020 |
| Dover Specsavers Hearcare Limited | Wholesale & retail | 2007 |