| Dolphin Capital Group UK Limited | Information & communication | 2023 |
| Dolphin Education Consultancy UK Limited | Education | 2019 |
| Dolphin Lettings Group UK Limited | Real estate | 2022 |
| DOM Construction Ltd | Construction | 2026 |
| Domestic Services Limited | Administrative & support | 2005 |
| Done Properly Consultancy Ltd | Information & communication | 2025 |
| Done Properly Group Ltd | Wholesale & retail | 2019 |
| Dongjin Limited | Real estate | 2020 |
| Donna Green Associates Limited | Professional & scientific | 2018 |
| Donne Place LLP | | 2012 |
| Donnelly Electrical Contractors Limited | Construction | 2001 |
| Doomie Drive Limited | Education | 2026 |
| Doorsafe Security Management Limited | Administrative & support | 2023 |
| Dorcas Bassong Consultancy Ltd | Construction | 2026 |
| Dothethings Ltd | Information & communication | 2024 |
| Double TAP Designs Ltd | Manufacturing | 2017 |
| Douglas Artisan Markets Limited | Hospitality | 2021 |
| Douglas Energy Solutions Limited | Construction | 2023 |
| Dovetails Joinery & Cabinet Makers Ltd | Construction | 2013 |
| Dowling Construction Ltd | Construction | 2025 |
| Downs Carpets Limited | Wholesale & retail | 2005 |
| Downsway Estates Limited | Real estate | 2001 |
| DP Engineering Consultants Limited | Professional & scientific | 2021 |
| DPD Kitchens Limited | Manufacturing | 2025 |
| DPD Plumbing & Heating Ltd | Construction | 2013 |
| DPE Cleaning Services Ltd | Administrative & support | 2023 |
| Dpelts Ltd | Professional & scientific | 2025 |
| DPL Lighting Ltd | Construction | 2013 |
| Dplocal Ecommerce Limited | Wholesale & retail | 2025 |
| DR Bhumika Medical Service Limited | Health & social care | 2023 |
| DR G V Aesthetics Limited | Health & social care | 2018 |
| DR Granny's Wellness Ltd | Wholesale & retail | 2024 |
| DR Health Limited | Financial services | 2014 |
| DR R K Moitra Limited | Health & social care | 2019 |
| DR Suzanna Watson Ltd | Health & social care | 2012 |
| DR Tanja Phillips Medical Aesthetic Clinic Ltd | Wholesale & retail | 2019 |
| DR. Carmen Aesthetics Ltd | Health & social care | 2018 |
| DRA Works Limited | Professional & scientific | 2025 |
| Dragonfly Drone Solution Limited | Professional & scientific | 2026 |
| Dragosghinoiu Limited | Transport & logistics | 2024 |
| Drakensberg Property Limited | Real estate | 2021 |
| Dramo Limited | Financial services | 2026 |
| Dreadnought Logistics Consultancy Ltd | Transport & logistics | 2026 |
| Dream Garden Landscaping Limited | Wholesale & retail | 2007 |
| Dreamhomes Properties Limited | Real estate | 2020 |
| Drekyr Ltd | Professional & scientific | 2025 |
| Drew Consult Ltd | Professional & scientific | 2022 |
| Driscoll Home Limited | Manufacturing | 2025 |
| Drivenbox Limited | Information & communication | 2012 |
| Drivenbox Property Ltd | Construction | 2018 |
| Driver Education Limited | Education | 2022 |
| Drivetech (UK) Limited | Education | 1998 |
| Dryline Performance Ltd | Arts & recreation | 2026 |
| DSC Electrical Services Ltd | Construction | 2023 |
| Dsds Holdings Ltd | Financial services | 2024 |
| Dsel Limited | Construction | 2023 |
| DSP Construction Services Ltd | Manufacturing | 2023 |
| Dstb Limited | Information & communication | 2009 |
| DTM Contractors Ltd | Construction | 2021 |
| DTM Fulfillment Limited | Wholesale & retail | 2021 |
| Dtpmac Limited | Health & social care | 2021 |
| DTS IT UK Limited | Information & communication | 2022 |
| DU PRE Limited | Information & communication | 1980 |
| DUA TR Ltd | Wholesale & retail | 2026 |
| Dual Purpose Limited | Construction | 1994 |
| Ductzilla Ltd | Construction | 2019 |
| Dudek Construction Ltd | Construction | 2015 |
| Dudy Driver Ltd | Transport & logistics | 2025 |
| DUE South Electrical Limited | Construction | 2022 |
| Duel Bars Sports (Basingstoke) Limited | Hospitality | 2025 |
| Dulai's Properties Limited | Real estate | 2018 |
| Dulcie Developments Limited | Construction | 2018 |
| Dumi Home Limited | Real estate | 2025 |
| Dummer Down Brewery Ltd | Manufacturing | 2021 |
| Dummer Farms Limited | Agriculture & fishing | 1980 |
| Duncan & Johnstone Consultancy Ltd | Professional & scientific | 2018 |
| Duncan Duncan Ltd | Real estate | 2020 |
| Dundee Gardens Basingstoke Land Limited | Administrative & support | 2017 |
| Dundee Gardens Basingstoke Management Limited | Households | 2005 |
| Dunford Penrose Limited | Professional & scientific | 2018 |
| Dunford Penrose Surveyors Ltd | Real estate | 2021 |
| Dunkel & Bright Associates LLP | | 2006 |
| Dunkenhalgh Estate Limited | Real estate | 1937 |
| Dunkin Wingz Limited | Hospitality | 2024 |
| Dunnell Projects Limited | Administrative & support | 2004 |
| Duocall Communications Ltd | Information & communication | 2007 |
| Durness Capital Ltd | Financial services | 2026 |
| Dury Holdings Limited | Real estate | 2021 |
| Dust Fairy Professional Cleaning Ltd | Administrative & support | 2024 |
| Dutch Digital Ltd | Information & communication | 2010 |
| DVS Power Tools Ltd | Wholesale & retail | 2017 |
| DWC Digitalworkflowcompliance Limited | Information & communication | 2023 |
| DWS Driving Ltd | Education | 2021 |
| Dyco Holdings Ltd | Professional & scientific | 2022 |
| Dynara Consulting Ltd | Information & communication | 2024 |
| DYU Nepal Limited | Wholesale & retail | 2023 |
| E-Media Tech Ltd | Information & communication | 2024 |
| E-Quality Technical Services Limited | Information & communication | 2014 |
| E.M.S.999 Limited | Health & social care | 2016 |
| E11EVEN Cleaning Limited | Administrative & support | 2023 |