| DNA Logistics London Ltd | Transport & logistics | 2025 |
| DND Entertainment Ltd | Arts & recreation | 2024 |
| DND London Management Ltd | Arts & recreation | 2023 |
| Dnipro Constructions Ltd | Construction | 2023 |
| DNJ Restoration Ltd | Real estate | 2026 |
| DNK Asset Management Ltd | Real estate | 2021 |
| DNP Global Ltd | Health & social care | 2016 |
| DNS Plumbing & Electrical Ltd | Construction | 2013 |
| DNY Consultancy Limited | Professional & scientific | 2019 |
| DO My HR Ltd | Information & communication | 2023 |
| Dobie Property Investment Ltd | Real estate | 2019 |
| Dobie Software Design by Contract Ltd | Information & communication | 2023 |
| Dobrikov Ltd | Construction | 2018 |
| Docemo and Sons UK Ltd | Construction | 2020 |
| Dochub Ltd | Education | 2025 |
| Dockers Trading Limited | Other services | 2006 |
| Doctors Assist Limited | Education | 2023 |
| Documak Ltd | Professional & scientific | 2018 |
| Documakgo Ltd | Professional & scientific | 2024 |
| Documakpro Ltd | Professional & scientific | 2021 |
| Doddi Logistics Ltd | Transport & logistics | 2017 |
| Dog Ride Ltd | Hospitality | 2024 |
| Doggett Road Limited | Real estate | 2025 |
| Dolita Limited | Real estate | 2012 |
| Doljul Ventures & Electronics Limited | Other services | 2013 |
| Dolu Toys UK Limited | Extraterritorial | 2013 |
| DOM & Co Constructions Ltd | Construction | 2021 |
| DOM & Co Group Limited | Financial services | 2025 |
| DOM & Co Properties (UK) Limited | Households | 2023 |
| DOM Invest Ltd | Real estate | 2019 |
| DOM Power Ltd | Construction | 2024 |
| DOM Tech Ltd | Manufacturing | 2016 |
| Dom-Mil Construction Ltd | Construction | 2018 |
| Dom.Rail&Civils Ltd | Construction | 2018 |
| Domestic Cleaners of London Limited | Administrative & support | 2022 |
| Domicile Refurb Ltd | Construction | 2022 |
| Domikon Elysium Ltd | Real estate | 2025 |
| Dominant Support Solutions Ltd | Administrative & support | 2021 |
| Domus Aurea Ltd | Administrative & support | 2026 |
| DON BOY Ltd | Wholesale & retail | 2025 |
| DON Build Ltd | Construction | 2025 |
| DON Homes Ltd | Real estate | 2020 |
| DON Profesionals Limited | Health & social care | 2015 |
| Dona Carlas Kitchen Ltd | Hospitality | 2020 |
| Donas Services Ltd | Professional & scientific | 2023 |
| Donesol Tech Services Ltd | Information & communication | 2017 |
| Donland Engineering Holdings Ltd | Financial services | 2025 |
| Donland Engineering Limited | Manufacturing | 1968 |
| Donoghue PS Ltd | Real estate | 2026 |
| Dons Healthcare Limited | Health & social care | 2016 |
| Doodlenest Press Limited | Information & communication | 2025 |
| Door and Window Expert Limited | Manufacturing | 2022 |
| Door to Door Courier Services Ltd | Transport & logistics | 2018 |
| Doradeen Wells Limited | Other services | 1980 |
| Doran Consultants Ltd | Professional & scientific | 2017 |
| Dora’S Homes LET Ltd | Real estate | 2025 |
| Doresi Ltd | Real estate | 2025 |
| Doreto Ltd | Construction | 2020 |
| Dorien Road 2 Limited | Construction | 2019 |
| Dorien Road Ltd | Real estate | 2019 |
| Dorle UK Ltd | Other services | 2025 |
| Dorman Removals Ltd | Transport & logistics | 2026 |
| Dorota Design Limited | Manufacturing | 2014 |
| Dosamac Limited | Other services | 2013 |
| DOT Black Creative Studio Ltd | Information & communication | 2026 |
| Dot.Bubbletea Ltd | Hospitality | 2025 |
| Dotcom Logistics & Services Ltd | Transport & logistics | 2016 |
| Dottedline Inc Ltd | Information & communication | 2018 |
| Dotty COW Ltd | Wholesale & retail | 2018 |
| Double a Event Support Services Limited | Administrative & support | 2009 |
| Doubting Thomas Limited | Real estate | 2024 |
| Douglas Autos Limited | Wholesale & retail | 2015 |
| Douglas Blausten Consulting Ltd | Professional & scientific | 2015 |
| Douglas Healthcare Ltd | Professional & scientific | 2026 |
| Dover Road Stores Limited | Real estate | 2005 |
| Dovercourt Rr&B Properties Limited | Administrative & support | 2013 |
| Doves Design and Build Limited | Professional & scientific | 2022 |
| Downes Eyecare Limited | Wholesale & retail | 2017 |
| DP Electrical Essex Ltd | Construction | 2023 |
| DP Homes 4 Limited | Construction | 2026 |
| DPC Cleaning Services Ltd | Administrative & support | 2024 |
| DPC Trading Ltd | Wholesale & retail | 2020 |
| DPF Construction Ltd | Construction | 2018 |
| DPH Servicing Ltd | Construction | 2026 |
| DPM Property Services Limited | Construction | 2019 |
| DPR Construction Ltd | Construction | 2025 |
| DPZ Limited | Construction | 2024 |
| DR Folson and Co Limited | Health & social care | 2016 |
| DR GAP Ltd | Wholesale & retail | 2024 |
| DR K Joshi Ltd | Health & social care | 2017 |
| DR M E Johnson Medical Services Limited | Education | 2008 |
| DR Roma GP Limited | Health & social care | 2021 |
| DR Sali Clinic Ltd | Health & social care | 2024 |
| DRA Trans Limited | Transport & logistics | 2021 |
| DRA Transport Ltd | Transport & logistics | 2021 |
| Drafoni Limited | Hospitality | 2024 |
| Dragan Bricks Ltd | Construction | 2025 |
| Dragan Group Ltd | Construction | 2023 |
| Dragon Clan Property Ltd | Real estate | 2025 |
| Dragon Kingdom Ltd | Hospitality | 2026 |