| Dolpa Limited | Wholesale & retail | 2026 |
| Dolphin Team Ltd | Other services | 2018 |
| Dolphinson Limited | Hospitality | 2020 |
| Dombro Properties Limited | Real estate | 2020 |
| Domehome Limited | Real estate | 2025 |
| Domrox Domestic and Commercial Cleaning Services Ltd | Administrative & support | 2020 |
| Dooa Bromley Limited | Real estate | 2021 |
| Doodle Toys Ltd | Wholesale & retail | 2019 |
| DOOR2PORT Couriers Ltd | Transport & logistics | 2006 |
| Doorstepvision Ltd | Wholesale & retail | 2024 |
| Dosf UK Limited | Arts & recreation | 2024 |
| Dotem Design Ltd | Professional & scientific | 2018 |
| Double Vision Entertainment Ltd | Information & communication | 2015 |
| Dovale Limited | Other services | 2017 |
| Dovetail Talent Ltd | Administrative & support | 2025 |
| Downs Court (Ealing) Management Company Limited | Real estate | 1985 |
| Downtown Groceries Ltd | Wholesale & retail | 2022 |
| DP Construction & Renovation Ltd | Construction | 2024 |
| DP Electrician Ltd | Construction | 2026 |
| DPM Carpentry Limited | Manufacturing | 2019 |
| DR Akber ALI Ltd | Health & social care | 2015 |
| DR Goros Aesthetic Medicine Limited | Health & social care | 2026 |
| DR Haddawi Revive Aesthetics Ltd | Health & social care | 2025 |
| DR King Health Foods Ltd | Manufacturing | 2013 |
| DR Vapes E-Liquid Ltd | Wholesale & retail | 2016 |
| DR Yeoh Sports Medicine Services Limited | Health & social care | 2015 |
| DR. David PM Foundation | Other services | 2025 |
| Drac Holdings Limited | Real estate | 2022 |
| Drakaris Ltd | Professional & scientific | 2025 |
| Dream Occasions UK Ltd | Wholesale & retail | 2008 |
| Drew Palmer TC Ltd | Administrative & support | 2015 |
| Drinkz Store Ltd | Wholesale & retail | 2021 |
| Drivetech Autocare Ltd | Wholesale & retail | 2022 |
| Drtf Ltd | Arts & recreation | 2015 |
| DS Asset Holdings Ltd | Real estate | 2020 |
| DS Ultrasound Services Limited | Professional & scientific | 2008 |
| Dselvan Ltd | Health & social care | 2022 |
| DSK World Ltd | Wholesale & retail | 2019 |
| DSN Vision Ltd | Transport & logistics | 2024 |
| DSR Digital Ltd | Information & communication | 2018 |
| DSS Motors Ltd | Transport & logistics | 2023 |
| DSS Transportation Ltd | Transport & logistics | 2025 |
| DTG Haulage Ltd | Administrative & support | 2022 |
| DUB School London Ltd | Education | 2025 |
| Duet London Limited | Professional & scientific | 2022 |
| Dumitru Iacub Ltd | Construction | 2021 |
| Dune Music Publishing Limited | Arts & recreation | 1997 |
| Dune Records International Ltd | Information & communication | 1997 |
| Durkin and Sons Limited | Construction | 1983 |
| Durkin Civil Engineering Limited | Construction | 1987 |
| Durkin Power Engineering Limited | Construction | 1995 |
| Durrant Electrical Mechanical Services Limited | Construction | 2015 |
| Dursley Properties Limited | Real estate | 2014 |
| Dusfoods Limited | Hospitality | 2020 |
| Dutch Properties Ltd | Households | 2023 |
| Dutron JJJ Limited | Information & communication | 2023 |
| Duvs Limited | Extraterritorial | 2024 |
| DV Construction Group Ltd | Construction | 2023 |
| DVF Group PLC | Financial services | 2000 |
| Dwella Property Ltd | Real estate | 2025 |
| DX Builders Limited | Construction | 2016 |
| DY IT Solutions Ltd | Information & communication | 2025 |
| Dyad Media Ltd | Arts & recreation | 2020 |
| Dynastar Pharma UK Ltd | Wholesale & retail | 2026 |
| Dynastiq Ltd | Wholesale & retail | 2025 |
| Dynatorq Systems Ltd | Professional & scientific | 2025 |
| Dyne Sourcing Ltd | Professional & scientific | 2023 |
| DZT Ltd | Construction | 2007 |
| Dékaura London Limited | Other services | 2021 |
| D’Lux Recipes Ltd | Hospitality | 2026 |
| D’S Delights Ltd | Manufacturing | 2025 |
| E K G . Fit Limited | Health & social care | 2018 |
| E M Enterprises Ltd | Administrative & support | 2026 |
| E Spring Limited | Wholesale & retail | 2022 |
| E&C Clean and Maintain Ltd | Water & waste | 2014 |
| E-Gadgets & Vapes Limited | Other services | 2017 |
| E-Houseware Ltd | Wholesale & retail | 2019 |
| E-Quality Independent Visits & Consultancy Ltd | Professional & scientific | 2021 |
| E2R Elevator Limited | Manufacturing | 2023 |
| Each Care Ltd | Health & social care | 2013 |
| Eagle EYE Edit Ltd | Information & communication | 2022 |
| Eagle Properties Limited | Real estate | 1986 |
| Eagle Wash & Go Ltd | Administrative & support | 2024 |
| Eaglechase Limited | Real estate | 1987 |
| Eaglechase Properties Limited | Construction | 2000 |
| Eaglesford Security Services Ltd | Administrative & support | 2018 |
| Ealing Community Transport | Transport & logistics | 2010 |
| Ealing Electrical Wholesalers Ltd | Wholesale & retail | 2026 |
| Ealing Electricians Ltd | Construction | 2020 |
| Ealing Essentials Ltd | Construction | 2026 |
| Ealing Estates Ltd | Real estate | 2026 |
| Ealing Golf Club (1923) Limited | Arts & recreation | 1923 |
| Ealing Group Ltd | Financial services | 2026 |
| Ealing Mencap | Health & social care | 1995 |
| Ealing Park Lodge Management Limited | Hospitality | 1990 |
| Ealing Park Lodge RTM Company Limited | Households | 2025 |
| Ealing Plumbing Limited | Construction | 2022 |
| Ealiya Solutions Ltd | Construction | 2020 |
| Earth 4 Construction Ltd | Construction | 2025 |
| Easicars Ltd | Wholesale & retail | 2022 |