| D-Dangs Ltd | Health & social care | 2020 |
| D-Tech Roofing Limited | Construction | 2026 |
| D.A.L. Industrial Services Limited | | 1970 |
| D.K Heating and Plumbing Ltd | Construction | 2021 |
| D2L Construction Ltd | Construction | 2023 |
| DAA Healthcare Group Limited | Health & social care | 2023 |
| DAA Property Ventures Limited | Real estate | 2023 |
| Daan Property Investments Ltd | Real estate | 2025 |
| Daanish Homes Limited | Real estate | 2016 |
| Daawa Ltd | Transport & logistics | 2018 |
| Dabeezds Ltd | Arts & recreation | 2024 |
| Dabitakhan Limited | Wholesale & retail | 2025 |
| DAD Consulting Ltd | Professional & scientific | 2019 |
| Dada Capital Ltd | Transport & logistics | 2012 |
| Daedal Lift Ltd | Manufacturing | 2014 |
| Daga Group Ltd | Construction | 2024 |
| Daily Cart Limited | Wholesale & retail | 2026 |
| Daily Grind LDN Limited | Hospitality | 2026 |
| Daily Home Deals Limited | Wholesale & retail | 2026 |
| Dailyneeds Food Supplies Limited | Wholesale & retail | 2013 |
| Dakah Limited | Professional & scientific | 2021 |
| Daksh Annam Properties Ltd | Construction | 2026 |
| Dala Investment Services Ltd | Real estate | 2013 |
| Dalab Hire Limited | Transport & logistics | 2016 |
| Dale Building Contractor Ltd | Administrative & support | 2017 |
| Daler Kitchens Limited | Manufacturing | 2013 |
| Daler Real Estate Holdings Ltd | Real estate | 2025 |
| Dalisha Catering Ltd | Hospitality | 2020 |
| Daljeet Transport Ltd | Transport & logistics | 2025 |
| Daljit&Brothers Ltd | Real estate | 2024 |
| Dallas Property Services Limited | Real estate | 2025 |
| Dalm Management & Strategy Ltd | Professional & scientific | 2019 |
| Daluli Building Ltd | Construction | 2024 |
| Daman Bar & Restaurant Ltd | Hospitality | 2025 |
| Daman Food & Wine Ltd | Wholesale & retail | 2023 |
| Damirokexpress Ltd | Wholesale & retail | 2021 |
| Damp Guard Solutions Limited | Construction | 2024 |
| DAN Lighting Limited | Information & communication | 2023 |
| Dan-Goroyo Limited | Other services | 2012 |
| Danbocai Enterprises Ltd | Administrative & support | 2024 |
| Danbred Limited | Construction | 2021 |
| Dang Group Ltd | Information & communication | 2021 |
| Dani Distribution Ltd | Wholesale & retail | 2016 |
| Daniel Motor Services Ltd | Manufacturing | 2005 |
| Danil Trans Ltd | Transport & logistics | 2016 |
| Danis Plumbing & Heating Ltd | Construction | 2025 |
| Danish Ltd | Transport & logistics | 2025 |
| Danish Traders Limited | Administrative & support | 2020 |
| Dansoul Ltd | Other services | 2021 |
| Danyar Relief & Development Organisation Ltd | Other services | 2018 |
| Darbar Coffee House Limited | Hospitality | 2025 |
| Darcy Skips Ltd | Water & waste | 2016 |
| Darrcosmetics Ltd | Wholesale & retail | 2024 |
| Darsait Limited | Information & communication | 2025 |
| Darshana Optics Ltd | Wholesale & retail | 2014 |
| Darvesh Properties Ltd | Real estate | 2021 |
| Darveys UK Limited | Wholesale & retail | 2023 |
| Dash Development & Logistics Ltd | Construction | 2025 |
| Dash Hair & Beauty Ltd | Other services | 2022 |
| Dash Hppl Group Ltd | Wholesale & retail | 2025 |
| Dashmesh Construction Ltd | Construction | 2024 |
| Dashmesh Kitchen and Bedroom Ltd | Construction | 2021 |
| Dastaar Wale Caterers Ltd | Hospitality | 2024 |
| Data Care Solutions Limited | Information & communication | 2017 |
| Data Handling Solutions Ltd | Information & communication | 2025 |
| Dataar Properties Ltd | Real estate | 2017 |
| Dataelite Limited | Information & communication | 2017 |
| Datapipe Europe Limited | Information & communication | 2003 |
| Dataryx Limited | Construction | 2026 |
| Dataspread Management Limited | Manufacturing | 2008 |
| Datobi PCO and PHV Car Hire Limited | Transport & logistics | 2025 |
| Datobi Property Solutions Limited | Real estate | 2022 |
| Datta Finance and Trading Private Limited | Administrative & support | 2023 |
| Davdra Investments Ltd | Real estate | 2016 |
| Davebass Ltd | Health & social care | 2022 |
| Daventry Investments Ltd | Real estate | 2024 |
| Dawat Limited | Hospitality | 2013 |
| Dawley Chicken Hayes Ltd | Hospitality | 2024 |
| Dawley Chicken Ltd | Hospitality | 2018 |
| Dawley Chicken Tasty Ltd | Hospitality | 2026 |
| Dawley Superfoods Ltd | Wholesale & retail | 2015 |
| Day Dream Construction Ltd | Construction | 2024 |
| Day to Day Food and Wine Ltd | Wholesale & retail | 2021 |
| Dayaa Ltd | Wholesale & retail | 2025 |
| Dayal & Sons Tech Ltd | Wholesale & retail | 2024 |
| Dayal Couriers Ltd | Transport & logistics | 2024 |
| Dayal Investments Ltd | Real estate | 2020 |
| Dayhod Ltd | Information & communication | 2021 |
| Dazy Builds Ltd | Construction | 2026 |
| DBE Group Ltd | Professional & scientific | 2018 |
| DBK Developments Ltd | Construction | 2023 |
| DBK Estate Agents Limited | Real estate | 1999 |
| DBK Investments Ltd | Real estate | 2013 |
| DBK Lettings Limited | Real estate | 1999 |
| DC Bros Ltd | Manufacturing | 2023 |
| DC Taneja Transport Ltd | Transport & logistics | 2024 |
| DCG Properties (UK.) Ltd | Real estate | 2019 |
| DCS - Dang Consulting & Sales Ltd. | Construction | 2018 |
| DD Travel Odds and Ends Ltd | Administrative & support | 2023 |
| DDE Consultants Limited | Professional & scientific | 2024 |