| D&J Finsoft Services Limited | Information & communication | 2023 |
| D&J Getaways Limited | Administrative & support | 2025 |
| D&K Advance Solutions Limited | Construction | 2024 |
| D&L Cleaning Service Ltd | Administrative & support | 2013 |
| D&M Pharma Ltd | Professional & scientific | 2016 |
| D&M Stoica Construction Ltd | Construction | 2025 |
| D&M Storage Limited | Other services | 2021 |
| D&P Fire Ltd | Construction | 2025 |
| D&R Facades Ltd | Construction | 2020 |
| D&S Construct Ltd | Construction | 2022 |
| D&S Facades Ltd | Administrative & support | 2018 |
| D&S Property Consultancy Ltd | Information & communication | 2017 |
| D&S Skips Limited | Water & waste | 2017 |
| D&S Trades Ltd | Wholesale & retail | 2026 |
| D&V Drylining Ltd | Construction | 2024 |
| D&V Operations Ltd | Transport & logistics | 2025 |
| D' Secrets Ltd | Other services | 2022 |
| D-Kash Limited | Wholesale & retail | 2011 |
| D-Trade Electrical Ltd | Construction | 2024 |
| D.A.R.W Limited | Construction | 2024 |
| D.B. Interpreting Ltd | Professional & scientific | 2007 |
| D.C. Materials Limited | Information & communication | 1991 |
| D.C. New Homes Limited | Construction | 2006 |
| D.C. Property Ltd | Real estate | 2020 |
| D.G.S Interiors Ltd | Construction | 2018 |
| D.M.J. Profile Tyres Limited | Wholesale & retail | 2004 |
| D.N.H. Group Ltd | Financial services | 2020 |
| D.O.S Electrical Limited | Energy | 2015 |
| D.P.J. Solutions Limited | Information & communication | 2003 |
| D.Reece Engineering Services Limited | Wholesale & retail | 2015 |
| D101195 Limited | Manufacturing | 2022 |
| D13 Ltd | Professional & scientific | 2024 |
| D3 B.N.P Limited | Wholesale & retail | 2025 |
| D365 Training Ltd | Information & communication | 2021 |
| D4DRIVERMEDICALS Ltd | Transport & logistics | 2025 |
| DA & BK Limited | Construction | 2014 |
| DA & NA Group Ltd | Real estate | 2023 |
| DA Costa Car Sale Ltd | Wholesale & retail | 2014 |
| DA Creative Labs Ltd | Information & communication | 2025 |
| DA Gadgets Ltd | Wholesale & retail | 2025 |
| DA GI Limited | Other services | 2023 |
| DA Hainault Construction Ltd | Construction | 2022 |
| Daahm UK Ltd | Health & social care | 2019 |
| Daal Ltd | Wholesale & retail | 2021 |
| Daanyal Enterprises Ltd | Real estate | 2025 |
| Daar AL Utoor Ltd | Wholesale & retail | 2024 |
| Daawat E Ishq Limited | Hospitality | 2026 |
| Dabhi Homes Ltd | Real estate | 2017 |
| Dabk Limited | Real estate | 2025 |
| Dacelo Ltd | Wholesale & retail | 2018 |
| Dacre House Limited | Professional & scientific | 2015 |
| Daddybrown Affia Limited | Real estate | 2021 |
| Dadswood Constructions Ltd | Construction | 2016 |
| Dadwal Estates Ltd | Real estate | 2023 |
| Dadyal Barbers Limited | Other services | 2020 |
| Dadyal Beauty Salon Limited | Other services | 2025 |
| Dafaè Prestige Ltd | Wholesale & retail | 2026 |
| Daffodil Services UK Limited | Administrative & support | 2023 |
| Dagenham Double Glazing Limited | Construction | 2021 |
| Dagenham Grand Hotel Ltd | Hospitality | 2023 |
| DAH SOL Ltd | Real estate | 2025 |
| Dahlia Properties Ltd | Real estate | 2021 |
| Daialex Trans Ltd | Transport & logistics | 2016 |
| Daily DEALS247 Ltd | Wholesale & retail | 2025 |
| Daily Driving School Ltd | Education | 2020 |
| Daily Fresh Meat Ltd | Wholesale & retail | 2020 |
| Daily Zest Limited | Professional & scientific | 2010 |
| Daim Enterprises Ltd | Hospitality | 2012 |
| Daimsaim Ltd | Wholesale & retail | 2025 |
| Daineser Ltd | Wholesale & retail | 2021 |
| Daintons Electrical Limited | Construction | 2017 |
| Dairy Mews Ltd | Real estate | 2023 |
| Daisy Transport Ltd | Transport & logistics | 2025 |
| Daivy London Limited | Wholesale & retail | 2023 |
| Dajj Ltd | Manufacturing | 2010 |
| Dalbir Investments Ltd | Real estate | 2017 |
| Dalco Services Limited | Construction | 2006 |
| Dalin Decorating Ltd | Construction | 2019 |
| Dalon Advertising Services Limited | Administrative & support | 2019 |
| Dalssi Limited | Construction | 2020 |
| Dalycorp Enterprises Limited | Extraterritorial | 2024 |
| Damian Builders Limited | Construction | 2025 |
| Damico Ltd | Hospitality | 2019 |
| Damson Gardens Property Ltd | Real estate | 2019 |
| Damson Jelly Ltd | Professional & scientific | 2020 |
| DAN Alex Construction Ltd | Construction | 2019 |
| DAN Construction Management Limited | Construction | 2018 |
| DAN London Engineers Ltd | Construction | 2018 |
| DAN Motor Services Limited | Transport & logistics | 2026 |
| DAN Scrap Trade Ltd | Manufacturing | 2025 |
| Dancle Meat Factory Ltd | Manufacturing | 2020 |
| DANGEANI15 Ltd | Transport & logistics | 2018 |
| Dani & KD Ltd | Construction | 2026 |
| Dani Cars Ltd | Administrative & support | 2026 |
| Daniel Adrian Limited | Construction | 2018 |
| Daniel Cleaning Ltd | Administrative & support | 2025 |
| Daniel Collier Services (Ilford) Limited | Manufacturing | 2012 |
| Daniel Constructii Ltd | Construction | 2023 |
| Daniel Jordan Mcneish Ltd | Other services | 2020 |
| DANIEL23 Limited | Wholesale & retail | 2023 |