| Devxa Ltd | Information & communication | 2016 |
| DEW Real Properties Limited | Real estate | 2024 |
| DEW Technology Limited | Information & communication | 2014 |
| Dewdrop Ltd | Administrative & support | 2025 |
| DEY Traders Limited | Other services | 2020 |
| DFW Capital Ltd | Real estate | 2023 |
| DG Consulting Ltd | Professional & scientific | 2013 |
| DG Visions Ltd | Information & communication | 2024 |
| DGA Technology Limited | Real estate | 1999 |
| Dheer Ltd | Wholesale & retail | 2024 |
| Dhiyo Ltd | Professional & scientific | 2019 |
| Dialacut Barbers Ltd | Other services | 2024 |
| Dickerage Property Limited | Real estate | 2025 |
| Diesel Construction Limited | Construction | 2020 |
| Diet Paratha Limited | Professional & scientific | 2019 |
| Dieter Limited | Information & communication | 2014 |
| Digiprise Ltd | Information & communication | 2020 |
| Digital Asset Associates Ltd | Information & communication | 2018 |
| Digitalistico Ltd | Information & communication | 2025 |
| Digitips Ltd | Information & communication | 2023 |
| Ding Dong Limited | Other services | 2024 |
| Distinct Holdings Limited | Health & social care | 2010 |
| Ditton Residents Ltd | Real estate | 2018 |
| Dive Ability Limited | Health & social care | 2011 |
| Diverse Properties Ltd | Real estate | 2025 |
| DIVERSITY4CARE Limited | Health & social care | 2015 |
| DJ Bateman Management Limited | Information & communication | 2021 |
| DJ Clark Tutoring Ltd | Education | 2024 |
| Djgd Ltd | Arts & recreation | 2017 |
| DJW Consulting Limited | Information & communication | 2016 |
| DK Legal Ltd | Professional & scientific | 2016 |
| Dkek Limited | Professional & scientific | 2014 |
| Dkelectrical.London Ltd | Construction | 2025 |
| DKF Accountants Limited | Professional & scientific | 2010 |
| DLG Industries Limited | Information & communication | 2012 |
| DME Finance Limited | Financial services | 2020 |
| DMS Protection Service Ltd | Administrative & support | 2017 |
| DNA Athletic Performance Ltd | Health & social care | 2023 |
| DNA Chauffeur Ltd | Wholesale & retail | 2022 |
| DNM London Limited | Construction | 2025 |
| Dobingdesign Limited | Professional & scientific | 2017 |
| Docsmove.Com Ltd | Information & communication | 2011 |
| Doggy Day Tours Ltd. | Other services | 2013 |
| Doggy Styling Boutique Ltd | Other services | 2018 |
| Dome Petroleum Resources Ltd | Mining & quarrying | 2005 |
| Domitillaa Limited | Wholesale & retail | 2019 |
| Donalds Pies Limited | Hospitality | 2024 |
| Dopadopa Ltd | Wholesale & retail | 2026 |
| Dopinger Investment Ltd | Real estate | 2023 |
| Dopolavoro Ltd | Hospitality | 2024 |
| Doriem Solutions Limited | Information & communication | 2025 |
| Dorset Brothers Ltd | Wholesale & retail | 2019 |
| Dosa Company Tolworth Limited | Hospitality | 2025 |
| Double Fault Productions UK Ltd | Arts & recreation | 2024 |
| Down ST Productions Limited | Information & communication | 2020 |
| Downs View Lodge (Surbiton) Management Company Limited | Households | 1968 |
| Doxa DEO C.I.C. | Hospitality | 2023 |
| DP Chauffeurs Ltd | Transport & logistics | 2015 |
| DR Shari GP Locums Ltd | Health & social care | 2022 |
| Dragon Forward Ltd | Professional & scientific | 2012 |
| Dragon House (2007) Limited | Hospitality | 2007 |
| Drake & Scull Airport Services Limited | Construction | 1991 |
| Dramatico Limited | Arts & recreation | 1994 |
| Dramatico Music Publishing Limited | Arts & recreation | 1993 |
| Dramatico Songs Limited | Arts & recreation | 2008 |
| Drawn in INK Limited | Professional & scientific | 2010 |
| Dreamstone Studio Ltd | Wholesale & retail | 2019 |
| Drink NO Plastic Ltd | Wholesale & retail | 2025 |
| Drips Plumbing Limited | Other services | 2024 |
| Drishti Property Ltd | Real estate | 2020 |
| Driving Academy Global Limited | Other services | 2010 |
| DSD Management Ltd | Construction | 2025 |
| Dslm Consultancy Limited | Information & communication | 2019 |
| DST Global Solutions (Realty) Limited | Real estate | 2010 |
| DST Process Solutions Limited | Information & communication | 2010 |
| Dsti Group LLP | | 2004 |
| Dsti Holdings Limited | Professional & scientific | 2004 |
| DT Life Ltd | Information & communication | 2025 |
| DTR Consultancy Ltd | Professional & scientific | 2023 |
| Dttm Constructions Ltd | Construction | 2023 |
| Duckandwillow Ltd | Manufacturing | 2024 |
| Duckbury & Co Limited | Hospitality | 2025 |
| Dumont Investments Limited | Financial services | 1999 |
| Duncan Riedl Limited | Information & communication | 2010 |
| Dunn Ockham Limited | Professional & scientific | 2021 |
| Duong Ltd | Manufacturing | 2024 |
| Dworks Ltd | Construction | 2018 |
| DY Fast Foods Ltd | Hospitality | 2025 |
| Dynamic Trader Limited | Administrative & support | 2007 |
| Dynamo Electrics Ltd | Construction | 2008 |
| D’Ascoyne Consulting Ltd | Professional & scientific | 2025 |
| E & E London Limited | Wholesale & retail | 2004 |
| E E Projects Ltd | Construction | 2019 |
| E-Note Limited | Financial services | 2020 |
| E-Tech Solutions Limited | Information & communication | 2023 |
| E4 Engineering Limited | Professional & scientific | 2021 |
| E63 Properties UK Ltd | Real estate | 2020 |
| E92 Capital Limited | Information & communication | 2018 |
| E92 Plus Distribution Limited | Wholesale & retail | 1995 |
| E92 Plus Group Limited | Administrative & support | 2009 |