| Dizayee Limited | Professional & scientific | 2025 |
| Dizin Exchange Ltd | Financial services | 2026 |
| DJ Miles Construction Group Ltd | Construction | 2020 |
| DK2 Seaport Ltd | Professional & scientific | 2019 |
| DKM Promotions Ltd | Arts & recreation | 2024 |
| DKU Media Limited | Hospitality | 2012 |
| Dldc Consulting Limited | Information & communication | 2016 |
| Dlop Homes Trading Ltd | Hospitality | 2025 |
| DM Trade & Tech Ltd | Wholesale & retail | 2020 |
| DMF Smart Repairs Limited | Construction | 2024 |
| Dmjp Ltd | Real estate | 2020 |
| Dmob Media Limited | Information & communication | 2011 |
| Dmocatering Limited | Hospitality | 2023 |
| DMX Films Limited | Information & communication | 2010 |
| Dnatli Limited | Wholesale & retail | 2025 |
| DNG Food International Limited | Wholesale & retail | 2013 |
| DOB & Co London Ltd | Professional & scientific | 2016 |
| Docscorp Limited | Information & communication | 2008 |
| Doctor PA Ltd | Health & social care | 2014 |
| Doctor T Aesthetics Ltd | Health & social care | 2025 |
| Domestic and Commercial Locksmiths Ltd | Administrative & support | 2014 |
| Domestic Energy Assessing Performance Ltd | Other services | 2025 |
| Dominant Management Group Limited | Financial services | 2008 |
| Domingos Services Ltd | Professional & scientific | 2026 |
| Dominic Brigstocke Limited | Information & communication | 2006 |
| Dominic Holland Limited | Arts & recreation | 2004 |
| Domus Property Consulting Ltd | Real estate | 2015 |
| Dongguan YMT Cutting Tools Co., Ltd | Professional & scientific | 2015 |
| Donnapricehr Ltd | Administrative & support | 2023 |
| Donor Shepherd Ltd | Administrative & support | 2011 |
| Doorlocksmith Ltd | Manufacturing | 2023 |
| Doric Transaction UK Holdco 1 Limited | Financial services | 2020 |
| Doric Transaction UK Holdco 2 Limited | Financial services | 2020 |
| Dorothy’S Building Cleaning Service Ltd | Administrative & support | 2026 |
| Dorsa Jewellery Ltd | Manufacturing | 2026 |
| Dorset Mews Residents Management Company Limited | Households | 2000 |
| Dott Management Ltd | Information & communication | 2022 |
| Double Sentry Limited | Manufacturing | 2020 |
| Douglas Court Limited | Households | 1998 |
| Doulton Care Ltd | Health & social care | 2023 |
| Dowant Ltd | Wholesale & retail | 2017 |
| Down CT. Limited | Real estate | 2015 |
| Downings Management Limited | Households | 1987 |
| DP (London and South East) Limited | Administrative & support | 1999 |
| DP Contracting Limited | Administrative & support | 2003 |
| DP Select Limited | Administrative & support | 2016 |
| DR Andrew Pooley Limited | Health & social care | 2009 |
| DR Carley Hennah Limited | Health & social care | 2021 |
| DR Chabok Cardiologist Ltd | Health & social care | 2022 |
| DR Mariya Sarbicki Ltd | Health & social care | 2021 |
| Dragon Armoury Creative Limited | Real estate | 2022 |
| Dragonfly Motion Pictures Ltd | Information & communication | 2013 |
| Dransfield Consulting Services Ltd | Information & communication | 2020 |
| Drawingman Ltd | Professional & scientific | 2021 |
| Drayton Court Management (Tolworth) Limited | Households | 1978 |
| Dream Beyond Limited | Wholesale & retail | 2021 |
| Dream Cart Ltd | Wholesale & retail | 2025 |
| Dream Data Ltd | Information & communication | 2022 |
| Dream Destinations Limited | Administrative & support | 2025 |
| Dream House 1 Ltd | Real estate | 2023 |
| Dresden LP1 Limited Partnership | | 2007 |
| Dresden LP2 Limited Partnership | | 2007 |
| Dresden LP3 Limited Partnership | | 2007 |
| Drho Limited | Health & social care | 2012 |
| Driver Resource Recruitment Limited | Administrative & support | 2015 |
| Driver Trading Limited | Administrative & support | 2008 |
| Drop N Lockerz Ltd | Transport & logistics | 2018 |
| Drpa Recruitment Ltd | Professional & scientific | 2022 |
| Dryden Digital Limited | Information & communication | 2022 |
| Drysdale Street Management Limited | Households | 2001 |
| DS Consultant Limited | Real estate | 2025 |
| DS Creative Services Limited | Professional & scientific | 2015 |
| DSJ Solutions Limited | Wholesale & retail | 2015 |
| DSS Wimbledon Limited | Education | 2017 |
| DT Financial Management Ltd | Administrative & support | 2012 |
| DTR Construction Services Limited | Construction | 2025 |
| DUA Management Services Ltd | Other services | 2023 |
| Ductile Sections Limited | Manufacturing | 2016 |
| DUE Care Ltd | Other services | 2026 |
| Duffy Bros Services UK Limited | Real estate | 2019 |
| Duffy Commercial Services Ltd | Professional & scientific | 2016 |
| Durben International LLP | | 2025 |
| Dutch & Sons Ltd | Households | 2025 |
| Duttonwaller Ltd | Administrative & support | 2019 |
| Dutyport Ltd | Wholesale & retail | 2021 |
| Dwell Rich Ltd | Construction | 2020 |
| DWJ Ceramics Ltd | Construction | 2013 |
| DXP Global Ltd | Wholesale & retail | 2019 |
| Dyarr Ltd | Education | 2025 |
| Dylogen Ltd | Real estate | 2023 |
| Dynamic Manufacturing Ltd | Professional & scientific | 2025 |
| Dynamic Quant Limited | Information & communication | 2008 |
| Dynamic Therapeutics Ltd | Professional & scientific | 2023 |
| Dynamicorephysio Ltd | Health & social care | 2019 |
| Dynamics Lead PVT Limited | Real estate | 2022 |
| E a Gavril Ltd | Information & communication | 2025 |
| E H Mayes Ltd. | Information & communication | 2012 |
| E R Armfield Ltd | Transport & logistics | 2025 |
| E-Academy Holdings Ltd | Arts & recreation | 2021 |
| E-File IT Limited | Professional & scientific | 2000 |