| Decent Style Ltd | Wholesale & retail | 2026 |
| Decon Contracting Ltd | Energy | 2013 |
| DEE Cube Puzzle Ltd | Manufacturing | 2011 |
| Deepika Creations Limited | Wholesale & retail | 2026 |
| Defg Capital Group Ltd | Financial services | 2021 |
| Defi Asset Management Limited | Financial services | 2021 |
| DEG Consulting Ltd | Professional & scientific | 2022 |
| Deinow IT Services Limited | Information & communication | 2015 |
| Delaplex Software Limited | Wholesale & retail | 2024 |
| Delbania Limited | Construction | 2007 |
| Delicate Flowers Ltd | Wholesale & retail | 2026 |
| Delighting Ltd | Wholesale & retail | 2025 |
| Delta Auto Service Ltd | Wholesale & retail | 2026 |
| Delta Business Ltd | Real estate | 2025 |
| Delta Business Support Ltd | Real estate | 2021 |
| Delta Design Limited | Wholesale & retail | 2019 |
| Deluxe Sofa London Ltd | Manufacturing | 2018 |
| Deluxessentia Ltd | Other services | 2025 |
| Demash Solutions Limited | Professional & scientific | 2012 |
| Demira Holdings Limited | Real estate | 2020 |
| Demolition Services London Ltd | Construction | 2015 |
| Demolition Services South East Ltd | Construction | 2015 |
| Dena Travel Ltd | Administrative & support | 2023 |
| Dencraft Limited | Professional & scientific | 1995 |
| Denecroft Estates Limited | Construction | 1947 |
| Denis and Cristian Hair Couture Limited | Other services | 2014 |
| Denmoore Projects & Plant Limited | Construction | 2017 |
| Denner UK Ltd. | Wholesale & retail | 2024 |
| Dennis Court Freeholders Limited | Households | 2024 |
| Dentlux Ltd | Health & social care | 2025 |
| Dermapinning Training Academy Ltd | Extraterritorial | 2024 |
| Derzis Construct Ltd | Construction | 2020 |
| Desi Chinese Limited | Hospitality | 2017 |
| Designers Collection Ltd | Wholesale & retail | 2021 |
| Designodes Limited | Professional & scientific | 2025 |
| Detached Youths London Limited | Health & social care | 2017 |
| Detail Horizon Limited | Information & communication | 2016 |
| Detrim Ltd | Construction | 2019 |
| Deuke Energy Supply Ltd | Energy | 2025 |
| DEV Buys ANY Car Ltd | Wholesale & retail | 2021 |
| DEV Cars Limited | Wholesale & retail | 2014 |
| DEV Guru Limited | Wholesale & retail | 2025 |
| DEV Heating Solutions Ltd | Construction | 2016 |
| DEV Satya Properties Limited | Real estate | 2022 |
| Devonoak Electrical Limited | Construction | 2008 |
| DF Takeaways Limited | Hospitality | 2019 |
| DFN Plumbing & Heating Limited | Construction | 2022 |
| Dgrenovations Limited | Construction | 2022 |
| DH Properties Group Limited | Real estate | 2025 |
| Dhami Property Management Ltd | Real estate | 2026 |
| DHD Construction Ltd | Construction | 2015 |
| DHD Invest Limited | Real estate | 2020 |
| Dheera Logistics Services Limited | Transport & logistics | 2025 |
| DHT Consulting Limited | Information & communication | 2017 |
| Dial 1ST Construction Limited | Construction | 2006 |
| Dial Growth Ltd | Administrative & support | 2026 |
| Diamond 8 Homes Ltd | Real estate | 2024 |
| Diamond Chauffeur Services Ltd | Transport & logistics | 2025 |
| Diamond Coffins International Ltd | Manufacturing | 2021 |
| Diamond Group Europe Ltd | Other services | 2023 |
| Diamond Home 4 Builders Ltd | Construction | 2025 |
| Diana Wooden Project Ltd | Construction | 2021 |
| Dias Corner Limited | Wholesale & retail | 2025 |
| Diaspora Recruitment Ltd | Administrative & support | 2022 |
| Dictatethepace Ltd | Information & communication | 2022 |
| DID Solutions Ltd | Construction | 2017 |
| DIG Wild Ltd | Information & communication | 2025 |
| Digi E-Commerce Ltd | Construction | 2019 |
| DIGS2GO Ltd | Construction | 2018 |
| Diin Ltd | Other services | 2025 |
| Dilshay Properties Ltd | Real estate | 2026 |
| Dimeville Limited | Real estate | 1979 |
| Dipen & Dhanisha Properties Ltd | Real estate | 2025 |
| Dirt Gardening Limited | Professional & scientific | 2012 |
| Distingo Limited | Hospitality | 2019 |
| District SOF Ltd | Construction | 2018 |
| DIT Construction Ltd | Construction | 2019 |
| Ditya Enterprise Ltd | Construction | 2025 |
| DIU Builders Ltd | Construction | 2022 |
| Divine Payments Limited | Financial services | 2018 |
| Diving Explorers Limited | Arts & recreation | 2011 |
| Divricha Accountancy Limited | Professional & scientific | 2014 |
| Djcc Properties Limited | Real estate | 2010 |
| DK Accountancy (London) Limited | Professional & scientific | 2019 |
| DK Accountancy Limited | Professional & scientific | 2009 |
| DK Elite Services Ltd | Construction | 2015 |
| DK Trading Group Ltd | Wholesale & retail | 2026 |
| Dk&K Services Limited | Education | 2016 |
| Dksd Limited | Real estate | 2019 |
| DLB Venture Limited | Construction | 2026 |
| Dliner Limited | Wholesale & retail | 2026 |
| DMC Sparky Ltd | Construction | 2026 |
| DMJ (Cardiff) Limited | Wholesale & retail | 1989 |
| DN Flames Limited | Hospitality | 2022 |
| DO ME a Favour Gifts Limited | Administrative & support | 2016 |
| Dobson Fisher LLP | | 2016 |
| Doctors 24-7 Limited | Health & social care | 2012 |
| Dogariu Structures Ltd | Construction | 2025 |
| Dogra Holdings Limited | Real estate | 2020 |
| Dole Fitness Ltd | Other services | 2023 |