| DG Shipping Limited | Administrative & support | 1999 |
| DGA Holdings Limited | Financial services | 2022 |
| DGA Restaurant 1 Limited | Hospitality | 2022 |
| Dhiman Surgery Limited | Health & social care | 2017 |
| Dialiq Ltd | Information & communication | 2026 |
| Dialogue Events Ltd | Administrative & support | 2010 |
| Diamond Electricalz Limited | Wholesale & retail | 2015 |
| Diamond Home Support (ST. Albans) Ltd | Administrative & support | 2025 |
| Diamond Property London Limited | Construction | 2021 |
| Diasacul Limited | Hospitality | 2025 |
| Diaspo Limited | Hospitality | 2020 |
| Digital Ivory Limited | Information & communication | 2017 |
| Digital Pegboard Limited | Information & communication | 2025 |
| Digitate IT Consulting Limited | Information & communication | 2023 |
| Diligent Plumbing & Heating Ltd | Construction | 2018 |
| Dimension Media Ltd | Administrative & support | 2017 |
| Dine Fast Ltd | Hospitality | 2019 |
| Direct OT Ltd | Health & social care | 2023 |
| Dirty Stunts International Ltd | Other services | 2021 |
| Distinctive Makers Limited | Manufacturing | 2015 |
| Distribution Jinx Ltd | Transport & logistics | 2024 |
| Ditpharm Ltd | Wholesale & retail | 2018 |
| Diva TV Limited | Other services | 2011 |
| Diverse Processes Limited | Professional & scientific | 2018 |
| Divine Berkshire Ltd | Real estate | 2019 |
| Djrm Properties Limited | Real estate | 2018 |
| DKJ Johal Limited | Health & social care | 2023 |
| DLN Investments Limited | Real estate | 2025 |
| DMK Holdings Ltd | Real estate | 2020 |
| DML Marketing EOT Limited | Administrative & support | 2024 |
| DML Marketing Limited | Administrative & support | 1993 |
| DNK Property Investments Ltd | Real estate | 2026 |
| DO Enjoy Limited | Information & communication | 2019 |
| Docklands Ltd | Administrative & support | 2026 |
| Doctor H Ltd | Health & social care | 2025 |
| Dogs & Type Ltd | Other services | 1998 |
| Don'T Fret Audio Ltd | Information & communication | 2011 |
| Donax Limited | Professional & scientific | 2023 |
| Donne & Donne Limited | Information & communication | 2006 |
| Donseed UK Limited | Information & communication | 2013 |
| Doodlebug Productions Limited | Information & communication | 2023 |
| Door & Window Creations Ltd | Manufacturing | 2025 |
| Dorset Tuning & Remaps Ltd | Wholesale & retail | 2015 |
| DOT & TED Ltd | Manufacturing | 2018 |
| Doyle Building & Construction Limited | Construction | 2003 |
| DPD Consultancy Limited | Professional & scientific | 2022 |
| Dpss Cabling Services Limited | Construction | 1990 |
| Dpus Outlet Limited | Wholesale & retail | 2018 |
| DR Bruce Martin Limited | Health & social care | 2009 |
| DR Claxton Psychology Services Ltd | Health & social care | 2021 |
| DR F Barkatali Ltd | Health & social care | 2025 |
| DR Grace Kelly Ltd | Health & social care | 2018 |
| DR ISH Medical Services Limited | Health & social care | 2014 |
| DR MF Bellamy Medical Practice LLP | | 2010 |
| DR Props Limited | Arts & recreation | 2019 |
| DR RT Ltd | Health & social care | 2012 |
| DR Seema Jani Medical Limited | Health & social care | 2017 |
| Dracea Construction Ltd | Construction | 2019 |
| Dramatic Effects Ltd | Information & communication | 2025 |
| Draped Ltd | Manufacturing | 2024 |
| Dreamland UK Properties Ltd | Real estate | 2019 |
| Dropkick Ventures Limited | Professional & scientific | 2016 |
| DS Holdings (UK) Limited | Real estate | 2003 |
| DS Rads Ltd | Health & social care | 2024 |
| DSM Hospitality Ltd | Hospitality | 2017 |
| Dubm Ltd | Other services | 2024 |
| Duda Cleaning Ltd | Other services | 2026 |
| Dudleys PUB Co Ltd | Hospitality | 2025 |
| Duncans Groundworks Ltd | Construction | 2000 |
| Dunegrass Properties Limited | Other services | 1989 |
| Dunkley Roofing Limited | Construction | 2007 |
| DVS Property and Investments Ltd | Real estate | 2026 |
| DXB44 Limited | Professional & scientific | 2024 |
| Dylan Medical Ltd | Health & social care | 2018 |
| Dynamic Device Decisions Limited | Information & communication | 2014 |
| Dynasty Enterprises Ltd | Real estate | 2020 |
| D’Arc Consulting Limited | Information & communication | 2025 |
| E.N.K. FS Limited | Financial services | 2011 |
| Eagle View Digital Solutions Ltd. | Information & communication | 2003 |
| East Grinstead Properties Limited | Real estate | 1958 |
| Eastbury Road Limited | Real estate | 2004 |
| Eastware Pharmacy Limited | Wholesale & retail | 1994 |
| Easyadmin Group Ltd | Information & communication | 2024 |
| Easyexpat UK Limited | Administrative & support | 2021 |
| EBM Health Advisory Limited | Professional & scientific | 2025 |
| Echoreach Limited | Information & communication | 2019 |
| Echos Equestrian Limited | Agriculture & fishing | 2017 |
| Eco Craftsman Limited | Other services | 2014 |
| Eco Homes Global Limited | Construction | 2018 |
| Econex Ltd | Information & communication | 2024 |
| Econumy Capital Ltd | Extraterritorial | 2012 |
| ECS Fitness Ltd | Real estate | 2019 |
| Eden Homes MK Ltd | Households | 2022 |
| Edencote Limited | Real estate | 2022 |
| Edge Fusion Limited | Information & communication | 2010 |
| Edgemethods Limited | Information & communication | 2017 |
| EDI Global (UK) Limited | Information & communication | 2007 |
| EDR Crane Services Limited | Construction | 2015 |
| Education Prints Limited | Wholesale & retail | 2021 |
| Edwards Psychology Services Ltd | Health & social care | 2017 |