| Decent Plumbing Limited | Construction | 2024 |
| Decisio Advisory Limited | Real estate | 2023 |
| Decluttr ME Ltd | Other services | 2020 |
| Decozenuk Ltd | Wholesale & retail | 2023 |
| Decra Finish UK Ltd | Construction | 2013 |
| Dectre Services Limited | Professional & scientific | 2014 |
| Dedicated Logistic Services Ltd | Transport & logistics | 2016 |
| Deelong Consulting Limited | Professional & scientific | 2018 |
| Deeper Blue Limited | Professional & scientific | 2009 |
| Deepseeker Services Ltd | Professional & scientific | 2026 |
| Deeru Limited | Health & social care | 2018 |
| Degbri Developments Ltd | Real estate | 2025 |
| Degiorgio Developments Ltd | Real estate | 2024 |
| Degiorgio Properties Limited | Other services | 2008 |
| Degiorgio Property Ventures Ltd | Real estate | 2025 |
| Degiorgio Real Estate Ltd | Real estate | 2025 |
| Degiorgio Solutions Ltd | Professional & scientific | 2021 |
| Degthor Developments Ltd | Construction | 2025 |
| Dehaco UK Ltd | Wholesale & retail | 2025 |
| Deitransport Ltd | Transport & logistics | 2019 |
| DEK Services Ltd | Transport & logistics | 2023 |
| DEL Properties Group Ltd | Real estate | 2023 |
| Delarenta Legal Ltd | Other services | 2025 |
| Delawe UK Limited | Professional & scientific | 2010 |
| Delicacies & Events Ltd | Hospitality | 2018 |
| Delicious Meal Limited | Hospitality | 2020 |
| Delivery Parcels Vitanov Ltd | Transport & logistics | 2022 |
| Delivery Switch Ltd | Transport & logistics | 2020 |
| Deliverywe Limited | Transport & logistics | 2026 |
| Delmergate (Ashford) Limited | Wholesale & retail | 2024 |
| Delmergate (Coastal) Limited | Wholesale & retail | 2024 |
| Delmergate Ashford Holdings Limited | Financial services | 2025 |
| Delmergate Coastal Holdings Limited | Financial services | 2025 |
| Delmergate Limited | Wholesale & retail | 1979 |
| Delmergate Topco Limited | Financial services | 2025 |
| Delon Consulting Limited | Information & communication | 2017 |
| Delphi Ceramics Limited | Construction | 2003 |
| Delta Intelligent Living Ltd | Professional & scientific | 2023 |
| Delta Medics Ltd | Health & social care | 2025 |
| Delta Pharmaceutics Limited | Professional & scientific | 2012 |
| Delta Span Limited | Professional & scientific | 2011 |
| Deltaalpha Consulting Ltd | Hospitality | 2021 |
| Deltheo Logistics Limited | Transport & logistics | 2020 |
| Delv IT Limited | Information & communication | 2020 |
| Denbridge (Belvedere) Limited | Real estate | 1991 |
| Denbridge (Chislehurst) Limited | Real estate | 1992 |
| Denbridge (Exeter) Limited | Real estate | 2021 |
| Denbridge Holdings Limited | Professional & scientific | 2002 |
| Denbridge Investments Limited | Real estate | 2001 |
| Denbridge Southernhay Limited | Construction | 2024 |
| Denne Court Farm Limited | Construction | 2019 |
| Dennett Property Ltd | Real estate | 2024 |
| Dennis Family Financial Ltd | Financial services | 2023 |
| Dennyman Services Ltd | Transport & logistics | 2019 |
| Dera Healthcare Ltd | Health & social care | 2023 |
| Derrick's Dwellings Ltd | Construction | 2021 |
| Derriford Properties Ltd | Construction | 2025 |
| Desam Services Ltd | Administrative & support | 2025 |
| Descon Associates Limited | Professional & scientific | 2013 |
| Design & Drawing Consultancy Ltd | Professional & scientific | 2011 |
| DESIRE2WIN Mindset Transformation (MT) Ltd | Education | 2024 |
| Desired Security Systems Ltd | Administrative & support | 2023 |
| Despatch Pro Services Ltd | Transport & logistics | 2014 |
| Destined Services Limited | Health & social care | 2015 |
| Detach Group Limited | Financial services | 2017 |
| Detach Lending Limited | Financial services | 2017 |
| Devalmar Ltd | Transport & logistics | 2012 |
| Developing Young Futures CIC | Education | 2026 |
| Devilstorque Ltd | Wholesale & retail | 2011 |
| Devine Property Ltd | Real estate | 2018 |
| DF Security Ltd. | Administrative & support | 2018 |
| DG Microsoldering Services UK Ltd | Other services | 2023 |
| DGB Solicitors LLP | | 2008 |
| DI Trans Ltd | Transport & logistics | 2025 |
| Diamond Apple Limited | Wholesale & retail | 2023 |
| Diamond BUILDERS101 Limited | Construction | 2025 |
| Diamond Eight Properties Ltd | Real estate | 2024 |
| Diar Service Ltd | Wholesale & retail | 2026 |
| Dibble Optical Supplies Ltd | Professional & scientific | 2009 |
| Dice Workplace Interiors Ltd | Wholesale & retail | 2017 |
| Diesel Diagnostics Ltd | Professional & scientific | 2006 |
| Digi-M Ltd | Information & communication | 2015 |
| Digihaven IT Solutions Ltd | Wholesale & retail | 2024 |
| Digitacare Ltd | Information & communication | 2023 |
| Digital Creations Hub Ltd | Information & communication | 2023 |
| Digital Envee Limited | Information & communication | 2020 |
| Digital Foresights Ltd | Information & communication | 2020 |
| Digitaldrops Ltd | Wholesale & retail | 2016 |
| Digitek Innovations Ltd | Education | 2024 |
| Diison Ltd | Hospitality | 2019 |
| Dimer Ltd | Construction | 2022 |
| Dimetrix Electrical Services Ltd | Other services | 2007 |
| Dimetrix Residential Services Limited | Real estate | 2021 |
| Dinner Idea Ltd | Construction | 2024 |
| Dino MAX Services Ltd | Construction | 2013 |
| Direct Access Scaffolding Ltd | Construction | 2016 |
| Direct Commercials Limited | Wholesale & retail | 2001 |
| Dirty Grill Ltd | Hospitality | 2025 |
| Discdrome Limited | Information & communication | 1996 |
| Discount Detective Ltd | Wholesale & retail | 2020 |