| Day TEN Ltd | Extraterritorial | 2022 |
| Day Three Music Group Ltd | Information & communication | 2023 |
| Dayaan Cars Limited | Transport & logistics | 2026 |
| Dayi Supply Chain Co., Ltd | Manufacturing | 2025 |
| Daylight Electric Limited | Construction | 2025 |
| Daymark Decision Insights Ltd | Information & communication | 2023 |
| Dayone Food and Wine Limited | Wholesale & retail | 2016 |
| Dazzledrop Ltd | Wholesale & retail | 2025 |
| Dazzling Property Group Limited | Real estate | 2019 |
| DB Surfacing Limited | Construction | 2017 |
| Dbmds Ltd | Professional & scientific | 2021 |
| DBR Universe Ltd | Arts & recreation | 2026 |
| DC & SH Properties Limited | Real estate | 2026 |
| DC Contracting Ltd | Information & communication | 2014 |
| DC Facilities Limited | Administrative & support | 2023 |
| DC Projects Ltd | Extraterritorial | 2024 |
| DC Teacher Training Limited | Education | 2024 |
| DC Visual Ltd | Information & communication | 2026 |
| DCB Construction Ltd | Construction | 2015 |
| DD RK Ltd | Hospitality | 2025 |
| DDD Counselling Ltd | Hospitality | 2015 |
| Dddr Limited | Administrative & support | 2025 |
| DDT Care Limited | Health & social care | 2023 |
| DE Angelis Properties Ltd | Real estate | 2023 |
| DE Barr Properties Ltd | Real estate | 2024 |
| DE Cheney Gardens Management Company Limited | Households | 2017 |
| DE Clare Place (Hadlow) Management Company Limited | Households | 2008 |
| DE Montfort Park (Ashford - Phase 2) Management Company Limited | Households | 2004 |
| DE Mowbray House Freehold Limited | Households | 2014 |
| DE Vada Limited | Wholesale & retail | 2006 |
| De-Clair Construction Ltd | Construction | 2024 |
| De-Okor Ventures Ltd | Information & communication | 2025 |
| Deadcert (UK) Limited | Administrative & support | 2004 |
| Deadcert Recovery Ltd | Administrative & support | 2021 |
| Deaf UK 50 Plus CIC | Health & social care | 2024 |
| Deal With Dolphin Ltd | Other services | 2020 |
| Dean Court (Bamber Bridge) Residential Management Company Limited | Households | 2005 |
| Dean Johnson Consultancy & Property Management Limited | Other services | 2023 |
| Dean LEE Limited | Financial services | 2017 |
| Dean Road (Management Company ) 2 Limited | Households | 1998 |
| Dear Deer Development Limited | Construction | 2023 |
| Dearden HR Holdings Ltd | Financial services | 2019 |
| Dearden HR Limited | Administrative & support | 2014 |
| Dearhajia Limited | Information & communication | 2026 |
| Debbie Johnston Fcpfa Limited | Professional & scientific | 2022 |
| Decardi Beauty Ltd | Other services | 2022 |
| Decision Focus UK Limited | Information & communication | 2010 |
| Declans Darts Limited | Manufacturing | 2025 |
| Decourcy House Management Ltd | Real estate | 2020 |
| DEE Fashion UK Limited | Manufacturing | 2023 |
| DEE MAK Limited | Other services | 2023 |
| Deeco Ltd | Real estate | 2019 |
| Deedash Ltd | Wholesale & retail | 2025 |
| Deen Travellers & Services Ltd | Hospitality | 2023 |
| Deep Cleeaning Ltd | Administrative & support | 2025 |
| Deep Food Services Limited | Hospitality | 2020 |
| Deep Kleen Services Limited | Administrative & support | 2006 |
| Deep Notion Limited | Information & communication | 2025 |
| Deepdene Mansions Limited | Households | 2011 |
| Deeper Thinking Services Limited | Professional & scientific | 2024 |
| Deepika RAJ Holdings Limited | Financial services | 2024 |
| Deerhurst Court Management Company Limited | Households | 1987 |
| Dees Specialist Healthcare Ltd | Health & social care | 2010 |
| Deetees Group Ltd | Information & communication | 2023 |
| Deexploit Limited | Wholesale & retail | 2026 |
| Defiant Tribe Limited | Information & communication | 2024 |
| Defrae Contract Furniture Limited | Wholesale & retail | 2011 |
| Defrae Media Limited | Professional & scientific | 2014 |
| Defrae Web Ltd | Information & communication | 2021 |
| Deganwy Quay Homeowners Limited | Real estate | 2008 |
| Deganwy Quay Management Company Limited | Households | 2011 |
| Deirah Caters Ltd | Hospitality | 2021 |
| Dejá Brew London Limited | Hospitality | 2019 |
| Dekat Holding Ltd | Real estate | 2022 |
| Deko Group Services Limited | Construction | 2020 |
| Delamare Park (Nunney) Management Company Limited | Households | 2021 |
| Delan IT Consulting Limited | Information & communication | 2016 |
| Delange Skin and Woundcare Ltd | Health & social care | 2022 |
| Delft Takeaways Limited | Hospitality | 2023 |
| Deli House Ltd | Wholesale & retail | 2020 |
| Deliah Moyo Ltd | Information & communication | 2015 |
| Delifeng International Trading Ltd | Wholesale & retail | 2025 |
| Delightdecor Ltd | Hospitality | 2019 |
| Delivering Outcomes Support Ltd | Health & social care | 2022 |
| Deljohn Management Company Limited | Households | 2015 |
| Dellay Property Services Limited | Real estate | 2025 |
| Delly's Croydon Ltd | Hospitality | 2020 |
| Delmervale Management Limited | Households | 1980 |
| Delonoya Limited | Information & communication | 2008 |
| Delphwood Hollow Management Company Limited | Households | 2004 |
| Delta BUD Ltd | Construction | 2014 |
| Delta Dental Care Limited | Health & social care | 2017 |
| Delta POT UK Ltd | Hospitality | 2022 |
| Delta Solution Br/Pt Ltd | Transport & logistics | 2024 |
| Delta's Pizza Croydon Limited | Hospitality | 2025 |
| Deltastyle Limited | Professional & scientific | 2017 |
| Deltrons Ltd | Wholesale & retail | 2019 |
| Dembs Consult Limited | Education | 2017 |
| Dembs Investments Limited | Real estate | 2022 |
| Demiurge Developments Limited | Construction | 2017 |