| D9 Solutions Limited | Information & communication | 2009 |
| DA Vinci's Hornchurch Ltd | Hospitality | 2019 |
| Daas Estates Ltd | Real estate | 2024 |
| DAB Security Consultants Ltd | Administrative & support | 2021 |
| Daba Group Limited | Wholesale & retail | 2021 |
| DAC Logistic International & Co Limited | Transport & logistics | 2017 |
| DAD BOD Revolution Ltd | Wholesale & retail | 2020 |
| Dada Developments Ltd | Real estate | 2024 |
| Dainspark Ltd | Wholesale & retail | 2026 |
| Daisy Blinds and Shutters Ltd | Wholesale & retail | 2022 |
| Daisy Chains Nursery Ltd | Health & social care | 2025 |
| Daklik Limited | Wholesale & retail | 2025 |
| Damian Contractors Ltd | Construction | 2025 |
| Damsdolsword Limited | Wholesale & retail | 2018 |
| Damurah Commerce Limited | Wholesale & retail | 2025 |
| DAN Potatoes Limited | Wholesale & retail | 2025 |
| DAN West Dentserve Limited | Health & social care | 2021 |
| Dance the Decades Ltd | Other services | 2025 |
| Dani Plumbing & Heating Ltd | Construction | 2018 |
| Daniel Lile and Sons Ltd | Transport & logistics | 2025 |
| Daniel Skipper Personal Training Limited | Arts & recreation | 2021 |
| Daniel Welling Racing Ltd | Professional & scientific | 2025 |
| Daniel.K Tooling Limited | Administrative & support | 2015 |
| Danielle Armstrong Limited | Arts & recreation | 2013 |
| Danluker Limited | Administrative & support | 2004 |
| Danni's Body Goals Limited | Health & social care | 2017 |
| Danny Issues Ltd | Professional & scientific | 2025 |
| Dannyic Ltd | Transport & logistics | 2026 |
| Danvik Ltd | Real estate | 2021 |
| DAR AL Barakah Properties Ltd | Real estate | 2025 |
| Darfifad Ltd | Real estate | 2024 |
| Darla & Diora Ltd | Other services | 2022 |
| Dartey and Dartey Properties Limited | Real estate | 2023 |
| Darts Knight Ltd | Wholesale & retail | 2025 |
| Darv Ventilation Ltd | Construction | 2023 |
| DAS Energy & Services Ltd | Construction | 2024 |
| DAS Estates Ltd | Real estate | 2018 |
| Dasha Drylining Limited | Construction | 2020 |
| Data Base Wizards Limited | Information & communication | 1999 |
| Data Naturals Limited | Information & communication | 2016 |
| Data Team Co Ltd | Professional & scientific | 2015 |
| Dataservis Ltd | Construction | 2023 |
| Datashrubs Technologies Ltd | Information & communication | 2018 |
| Datco Healthcare Ltd | Wholesale & retail | 2021 |
| Datj Ltd | Real estate | 2022 |
| Davbech Limited | Real estate | 2018 |
| Dave's Track Solutions Limited | Construction | 2023 |
| Davebech Limited | Real estate | 2022 |
| David Bean Wealth Management Limited | Financial services | 2011 |
| David Farra Illustrator Ltd | Arts & recreation | 2020 |
| David Wood Organics Ltd | Wholesale & retail | 2006 |
| David&Co Trans Ltd | Transport & logistics | 2022 |
| Davidson Capital Ltd | Extraterritorial | 2022 |
| Davis Airport Cars Ltd | Transport & logistics | 2024 |
| Davis Property Investments Ltd | Real estate | 2018 |
| Davis Staycations Ltd | Real estate | 2023 |
| Dayone Hall Ltd | Financial services | 2020 |
| DB Link Ltd | Professional & scientific | 2020 |
| DB9 Properties Limited | Real estate | 2003 |
| DBD Property Group Limited | Real estate | 2025 |
| DBK Studios Limited | Information & communication | 2019 |
| DC Capital Trading Limited | Financial services | 2025 |
| DCR Alloys Ltd | Other services | 2018 |
| DCV Technologies Limited | Information & communication | 2006 |
| DD CAD Solutions Ltd | Professional & scientific | 2011 |
| Dd&Un Ltd | Real estate | 2024 |
| DDA Haulage Ltd | Transport & logistics | 2021 |
| DDB’48 Ltd | Transport & logistics | 2025 |
| DE Burgo Commercials Limited | Construction | 2016 |
| DE Burgo Wardrobes Limited | Manufacturing | 2023 |
| DE Kriek Ltd | Health & social care | 2026 |
| DE LA Costa Limited | Manufacturing | 1997 |
| DE Novo Line Ltd | Real estate | 2018 |
| Deadlift Media Ltd | Information & communication | 2018 |
| Dean Arlo Construction Ltd | Construction | 2023 |
| Dean Elliott Flooring Ltd | Construction | 2020 |
| Debden Motor Spares (Essex) Limited | Wholesale & retail | 1975 |
| Debden Motor Spares Limited | Wholesale & retail | 1966 |
| Debra Perkins Limited | Professional & scientific | 2006 |
| Decisions Determine Destiny Productions Ltd | Information & communication | 2020 |
| Dedalus Homes Ltd | Construction | 2019 |
| Dedalus Storage Ltd | Construction | 2025 |
| Deedify Limited | Information & communication | 2025 |
| Dehal Properties London Ltd | Real estate | 2023 |
| Dejaley Ltd | Health & social care | 2019 |
| Delbase Logistics Ltd | Transport & logistics | 2025 |
| Delia & Co Limited | Health & social care | 2022 |
| Delicious Nibbles Ltd | Hospitality | 2025 |
| Delightgrace Properties Limited | Real estate | 2025 |
| Delta Brokers Limited | Construction | 2020 |
| Delta Line Ltd | Construction | 2021 |
| Delta Squared Ltd | Professional & scientific | 2025 |
| Demy House Ltd | Construction | 2014 |
| Denham Electrical Contractors Ltd | Administrative & support | 2020 |
| Deninsure Limited | Financial services | 2007 |
| Denker Property Management Limited | Real estate | 2024 |
| Dent Focus Limited | Wholesale & retail | 2023 |
| Dental Money Limited | Professional & scientific | 2007 |
| Dentalshine Ltd | Health & social care | 2015 |
| Dentofacial Excellence Limited | Health & social care | 2010 |