| Digital March Limited | Information & communication | 1998 |
| Digital Paradise Limited | Information & communication | 2026 |
| Digitec Enterprise Ltd | Professional & scientific | 2021 |
| Digitforge Ltd | Wholesale & retail | 2026 |
| Digitology Limited | Information & communication | 2006 |
| Digizall Ltd | Wholesale & retail | 2025 |
| Digolbak Union Development Association UK (Duda) Ltd | Health & social care | 2019 |
| Dijas Digital Solutions Ltd | Wholesale & retail | 2022 |
| Dilawar Property Ltd. | Real estate | 2001 |
| Dilek Buyukbayram Ltd | Wholesale & retail | 2025 |
| Dimtel Limited | Information & communication | 2003 |
| Dincer Electrical Ltd | Manufacturing | 2021 |
| Dinossi Limited | Wholesale & retail | 2024 |
| Dionysus Derivatives Limited | Financial services | 2004 |
| Diop&Fall Ltd | Transport & logistics | 2024 |
| Diorest Accountancy Ltd | Professional & scientific | 2014 |
| Direct Dash Deals Ltd | Wholesale & retail | 2026 |
| Direct Force Trading Ltd | Wholesale & retail | 2024 |
| Direct Motor Claims Ltd | Wholesale & retail | 2025 |
| Directfirm Limited | Wholesale & retail | 1995 |
| Discount Cd-Rom Limited | Professional & scientific | 2001 |
| Discount Homes Limited | Construction | 1988 |
| Display System Fabrications Limited | Wholesale & retail | 1989 |
| District One Estates Ltd | Real estate | 2002 |
| Dita Health and Social Care Consultancy Limited | Administrative & support | 2004 |
| Divamimi Limited | Information & communication | 2012 |
| Dive Odyssea Scuba School Limited | Arts & recreation | 2003 |
| Divine Care Ministry | Health & social care | 2025 |
| Diwurah Ltd | Wholesale & retail | 2020 |
| Dizipco Ltd | Wholesale & retail | 2025 |
| Diziton Limited | Real estate | 1985 |
| DJ Slipmatt Limited | Information & communication | 2008 |
| Dj's Health Mantra Limited | Wholesale & retail | 2006 |
| DJK Cleaning Services Limited | Administrative & support | 2002 |
| Dkadlam Care Limited | Administrative & support | 2020 |
| DKE Ltd | Hospitality | 2026 |
| DKK Properties Ltd | Real estate | 2023 |
| DKT Global Ltd | Wholesale & retail | 2026 |
| Dlme Wise Ltd | Other services | 2022 |
| DMC Consultancy Limited | Wholesale & retail | 2005 |
| DMC Design and Print Limited | Manufacturing | 2005 |
| Dmmbevents Ltd | Hospitality | 2026 |
| DMS & JDM Import Limited | Wholesale & retail | 2016 |
| DNA Fire Engineering Limited | Public administration | 2026 |
| Doan GIA Limited | Hospitality | 2020 |
| DOC Cleaning Limited | Administrative & support | 2002 |
| Docnor Management Company Limited | Professional & scientific | 2016 |
| Doddmed Limited | Wholesale & retail | 2004 |
| Dodio Ltd | Other services | 2016 |
| Dodo House Ltd | Other services | 2023 |
| DOE Finance Limited | Extraterritorial | 1995 |
| DOE Motors Finance Limited | Financial services | 1966 |
| DOE Motors Limited | Wholesale & retail | 1949 |
| DOE Plant Hire Limited | Extraterritorial | 1956 |
| Dog & Cone Limited | Hospitality | 2019 |
| Dog and Co Limited | Wholesale & retail | 2010 |
| Doggett Road F2 Limited | Real estate | 2026 |
| Dokam Ltd | Wholesale & retail | 2026 |
| Dolaxo Properties Ltd | Real estate | 2021 |
| Dolledup Hair Extensions Limited | Other services | 2016 |
| Dolphin Electric and Heating Ltd | Construction | 2022 |
| Domain IP Services Limited | Information & communication | 2007 |
| Domibus Limited | Real estate | 2019 |
| Dominion Consultants & Services Limited | Administrative & support | 2020 |
| Dommond Properties Limited | Real estate | 2007 |
| Donald Ferguson & SON Limited | Agriculture & fishing | 1980 |
| Donnalov Limited | Administrative & support | 2023 |
| Doolittle's | | 2000 |
| DOORSUPERVISOR4U Ltd | Education | 2018 |
| Doraup Ltd | Wholesale & retail | 2024 |
| Dorvic Electrical Company Limited | Construction | 1995 |
| Dosev SA Estates Limited | Hospitality | 2023 |
| Doshi S L & Co Limited | Professional & scientific | 2007 |
| DOT Connections Limited | Information & communication | 2000 |
| Dotcomatic Limited | Information & communication | 2000 |
| Double Favour Limited | Health & social care | 2023 |
| Doublelight Resources Limited | Administrative & support | 2025 |
| Doughty Limited | Hospitality | 2003 |
| Dove House Five Limited | Real estate | 2016 |
| Dovemore Associates Limited | Health & social care | 2002 |
| Dovercourt Bowling Club Limited | Arts & recreation | 1938 |
| Downham & Manser Limited | Construction | 2003 |
| Dpover Limited | Wholesale & retail | 2024 |
| DR Adisa Research Ltd | Professional & scientific | 2025 |
| DR ASG Consulting Limited | Administrative & support | 2022 |
| DR Holmes Ltd | Real estate | 2022 |
| DR Ranjot Bhogal Ltd | Health & social care | 2023 |
| DR Robertsutton Limited | Administrative & support | 2025 |
| DR S E Uguegue Limited | Health & social care | 2026 |
| DR Suresh Marpuri Ltd | Health & social care | 2023 |
| Dragndeals Limited | Wholesale & retail | 2021 |
| Dragon Archery Centre Limited | Arts & recreation | 2006 |
| Dragon Retail 801 Limited | Wholesale & retail | 2025 |
| Dragonfly Scenery & Design Ltd | Other services | 2000 |
| Drainage Spares & Pipework Supplies Limited | Wholesale & retail | 1996 |
| Dramalink Limited | Information & communication | 2025 |
| Drapewell Limited | Real estate | 1980 |
| Dravex Limited Limited | Wholesale & retail | 2025 |
| Dravo Mart Ltd | Wholesale & retail | 2026 |
| Draymoor Limited | Professional & scientific | 1989 |