| Diagonal/A Ltd | Real estate | 2022 |
| Dialasheep Ltd | Professional & scientific | 2018 |
| Diamco Limited | Manufacturing | 2007 |
| Diamond Noir Law Limited | Professional & scientific | 2024 |
| Diamond Noir Properties Limited | Real estate | 2019 |
| Diana Flower Ltd | Wholesale & retail | 2025 |
| Diara Limited | Professional & scientific | 2025 |
| Dickens Yard Futures Ltd. | Real estate | 2017 |
| DIG Data Ltd | Information & communication | 2019 |
| Digit Accountants Limited | Professional & scientific | 2017 |
| Digital Enterprise Ltd | Administrative & support | 2018 |
| Digital Infusion Ltd | Information & communication | 2008 |
| Digital World Industrial Ltd | Wholesale & retail | 2022 |
| Digitally Majestic Ltd | Wholesale & retail | 2024 |
| Digitiz World Ltd | Wholesale & retail | 2024 |
| Digittel Ltd | Information & communication | 2017 |
| Digiversol Limited | Information & communication | 2018 |
| Digivizit Ltd | Information & communication | 2024 |
| Dignum Street Freehold Limited | Households | 2015 |
| Dilhe Limited | Financial services | 2025 |
| Diligent Recruitment Limited | Administrative & support | 2014 |
| Diligent Systems Ltd | Information & communication | 2013 |
| Diligent Technology Group Limited | Information & communication | 2013 |
| Dimehome Limited | Construction | 1989 |
| Dimension Chiropractic Clinic Ltd | Health & social care | 2024 |
| Dina Artistry Limited | Other services | 2021 |
| Dinanath Overseas Ltd | Hospitality | 2025 |
| Dinarkhail Properties Limited | Real estate | 2025 |
| Dine India (London) Limited | Hospitality | 2012 |
| Dino Gelato Ltd | Other services | 2026 |
| Dips Foods Limited | Hospitality | 2003 |
| Dipti United Media Limited | Information & communication | 2003 |
| Direct Financial Ltd | Professional & scientific | 2026 |
| Direct Financial Reclaim Ltd | Financial services | 2009 |
| Direct Service Connections Ltd | Construction | 2018 |
| Direct Supplyservices Limited | Construction | 2023 |
| Dirt Prof Ltd | Manufacturing | 2022 |
| Disability Urbanism Ltd | Professional & scientific | 2025 |
| Dita Investments Ltd | Real estate | 2018 |
| Dita Locum Services Ltd | Health & social care | 2011 |
| Dita Solutions Ltd | Information & communication | 2011 |
| Diversebelievers Ltd | Information & communication | 2025 |
| Divine the Kerala Caters Limited | Hospitality | 2025 |
| Divinegrace Jewels Limited | Wholesale & retail | 2025 |
| Diyunin Ltd | Professional & scientific | 2011 |
| DJ Warwick Limited | Real estate | 2019 |
| DJA Events Limited | Hospitality | 2019 |
| DJF Services Limited | Construction | 2017 |
| DJL Studio Limited | Arts & recreation | 2021 |
| Djmm Consulting Ltd | Professional & scientific | 2019 |
| DK Accounting Services Ltd | Professional & scientific | 2013 |
| Dkam Investments Ltd | Real estate | 2025 |
| Dkhalai Limited | Other services | 2017 |
| DKM Capital Limited | Information & communication | 2009 |
| DL Cafe Limited | Hospitality | 2025 |
| DLP Electrical Services Ltd | Construction | 2019 |
| DLT Labs Group Services Ltd | Other services | 2023 |
| DM Respiratory Limited | Health & social care | 2014 |
| Dmac Wealth Management Limited | Administrative & support | 2024 |
| Dmakwana Limited | Professional & scientific | 2024 |
| Dmano Limited | Construction | 2022 |
| Dmews RTM Company Limited | Households | 2024 |
| DMI Building Ltd | Construction | 2016 |
| DMS Home & Gardens Ltd | Construction | 2015 |
| Dmsk Training Solutions Ltd | Administrative & support | 2010 |
| DNA Professional Development Limited | Education | 2006 |
| Dnak Capital Limited | Real estate | 2019 |
| DNP Pubs Ltd | Hospitality | 2019 |
| DNR Ritz Healthcare Ltd | Wholesale & retail | 2017 |
| DNV Property Ltd | Real estate | 2024 |
| DOC T Limited | Real estate | 2024 |
| Docamali Ltd | Information & communication | 2011 |
| Dodi's Trading Limited | Hospitality | 2020 |
| DOI Consulting Limited | Professional & scientific | 2012 |
| Dolce Investments Ltd | Information & communication | 2008 |
| DOM Haulage Limited | Transport & logistics | 2017 |
| DOMIN8IT Ltd | Information & communication | 2014 |
| Doncom Ltd | Professional & scientific | 2016 |
| Donna Sheehan Limited | Financial services | 2003 |
| Doone Properties Limited | Real estate | 1964 |
| Door Sourced Ltd | Real estate | 2024 |
| Doozy Builder Ltd | Construction | 2022 |
| Doran Property Limited | Real estate | 2018 |
| Dorking Court RTM Company Limited | Extraterritorial | 2011 |
| Dorosti Co Ltd | Manufacturing | 2023 |
| Dost Plus Ltd | Wholesale & retail | 2025 |
| Dotty's Sweets Limited | Wholesale & retail | 2018 |
| Doubletree Interiors Limited | Wholesale & retail | 2021 |
| Dough Plug Ltd | Manufacturing | 2026 |
| Douglas Pryce Limited | Real estate | 2020 |
| Douglas Young Limited | Real estate | 1995 |
| Dove Park (East) Freehold Co. Ltd. | Real estate | 1996 |
| Dove Park(East)Property Management Co.Limited | Real estate | 1965 |
| Dovecote Ltd | Wholesale & retail | 2017 |
| Downs Park RTM Company Limited | Households | 2024 |
| Downwell (Hoxton) Limited | Financial services | 2017 |
| Downwell LLP | | 2011 |
| DP Stoneworks Limited | Construction | 2015 |
| Dpea Glass Limited | Construction | 2024 |
| DPM Partners LLP | | 2011 |