| Deep Dive Marine Limited | Professional & scientific | 2025 |
| Deep HAT Ltd | Real estate | 2024 |
| Deep Manufacturing Limited | Manufacturing | 2024 |
| Deep Pond Limited | Construction | 2019 |
| Deep R&D Ltd | Professional & scientific | 2021 |
| Deep Tech Recruitment Limited | Administrative & support | 2021 |
| Deepali Constructions Limited | Construction | 2026 |
| Deepchange Co Ltd | Information & communication | 2026 |
| Deeper Green Services Ltd | Agriculture & fishing | 2019 |
| Deeppulse Technologies Ltd | Manufacturing | 2026 |
| Deepstridesnutrition Ltd | Health & social care | 2024 |
| Deepwelltech Ltd | Information & communication | 2019 |
| Deeq Care Services Ltd | Health & social care | 2019 |
| Deercote Court Limited | Real estate | 2004 |
| Deerfield Developments Limited | Construction | 2011 |
| Deerhound Limited | Real estate | 2008 |
| Defence Training Services Limited | Real estate | 1999 |
| Defiance Tools Limited | Professional & scientific | 1994 |
| Defiantech Innovation Ltd | Information & communication | 2024 |
| Defib Sales and Training Limited | Health & social care | 2014 |
| Defiih Ltd | Manufacturing | 2025 |
| Define Dental Clinic Limited | Health & social care | 2021 |
| Defined by Linda Ltd | Other services | 2025 |
| Defined Decor Solutions Ltd | Construction | 2023 |
| Defoe of London Ltd | Education | 2010 |
| Defort LP | | 2014 |
| Deft Design Ltd | Wholesale & retail | 2019 |
| DEG Lettings Ltd | Real estate | 2015 |
| Degree Insulation Limited | Construction | 2017 |
| Degrees of Error Ltd | Arts & recreation | 2025 |
| Degusta Ltd | Wholesale & retail | 2014 |
| Deguzgirl Limited | Professional & scientific | 2025 |
| DEH Holdings Limited | Financial services | 2023 |
| Deharv Engineering Limited | Manufacturing | 2009 |
| Deirdre Angella Limited | Arts & recreation | 2018 |
| Deja VU 25 Limited | Wholesale & retail | 2025 |
| Deja VU Aesthetic Training Academy Ltd | Health & social care | 2015 |
| Dejana'Z Ltd | Manufacturing | 2020 |
| DEK Motors Limited | Wholesale & retail | 2006 |
| Deki Limited | Financial services | 2008 |
| Dekpro LP | | 2017 |
| Deks Industries Europe Limited | Wholesale & retail | 2013 |
| DEL Healthcare Recruitment Ltd | Health & social care | 2022 |
| DEL Piero Limited | Construction | 2006 |
| Dela Properties Ltd | Real estate | 2018 |
| Delabole Windfarm Limited | Energy | 2009 |
| Delacontrol Limited | Manufacturing | 2017 |
| Delamere White Advisors Ltd | Professional & scientific | 2026 |
| Delaney Properties Ltd | Real estate | 2001 |
| Delanj Projects Ltd | Professional & scientific | 2022 |
| Delaro Limited | Construction | 2013 |
| Delaware (Directors) Limited | Administrative & support | 2003 |
| Delaware (Nominees) Limited | Administrative & support | 2003 |
| Delaware (Secretaries) Limited | Administrative & support | 2004 |
| Delayed Action Door Holders Ltd | Professional & scientific | 2018 |
| Delboys Entertainments Ltd | Arts & recreation | 2003 |
| Delbridge Holdings Limited | Real estate | 2024 |
| Delbridge House Renovations Limited | Real estate | 2024 |
| Delbridge Rental Properties Ltd | Real estate | 2023 |
| Delegate and Grow Limited | Professional & scientific | 2019 |
| Delegations for Dialogue C.I.C. | Education | 2015 |
| Delfic Limited | Real estate | 2023 |
| Delgado Tennis Bookings Limited | Arts & recreation | 2026 |
| Delham LP | | 2012 |
| Delhi Tadka Limited | Hospitality | 2024 |
| Deli @ Sandy Park Ltd | Wholesale & retail | 2017 |
| Delia Healthcare Limited | Health & social care | 2025 |
| Delib Limited | Information & communication | 2004 |
| Delicious Holdings Limited | Professional & scientific | 2020 |
| Deliciously V Holdings Limited | Financial services | 2021 |
| Delight Fashions Limited | Wholesale & retail | 2025 |
| Delight Reich Gems & Jewellery UK PVT Ltd | Wholesale & retail | 2025 |
| Deliverbi Global Ltd | Information & communication | 2016 |
| Deliverbi Ltd | Information & communication | 2019 |
| Delivering Limited | Wholesale & retail | 2021 |
| DELIVERING4U Ltd | Transport & logistics | 2022 |
| Deliverinns Limited | Transport & logistics | 2018 |
| Delivery 4 YOU Ltd | Transport & logistics | 2019 |
| Delivery Performance Limited | Transport & logistics | 2022 |
| Delivery to Your House Ltd | Transport & logistics | 2025 |
| Delivery UN Limited | Professional & scientific | 2022 |
| Dell Fitness Ltd | Arts & recreation | 2026 |
| Dellow Construction Services Ltd | Professional & scientific | 2023 |
| Dellshore Limited | Real estate | 2006 |
| Delltex Limited | Other services | 2016 |
| Delmeth Marketing Limited Partnership | | 2023 |
| Delmi Mathew Limited | Health & social care | 2014 |
| Delogique Limited | Information & communication | 2007 |
| Delr Consultancy Limited | Professional & scientific | 2025 |
| Delroy's Kitchen Ltd | Hospitality | 2024 |
| Delroys Kitchen Caribbean Ltd | Hospitality | 2025 |
| Delson Ltd | Professional & scientific | 2024 |
| Delta Conservatories Limited | Construction | 2002 |
| Delta Consulting Group Limited | Professional & scientific | 2000 |
| Delta Dental Academy Ltd | Health & social care | 2016 |
| Delta Finder Ltd | Wholesale & retail | 2025 |
| Delta Forest UK Limited | Agriculture & fishing | 2023 |
| Delta Implant Ltd | Health & social care | 2025 |
| Delta Link Limited | Real estate | 2018 |
| Delta Plant Limited | Extraterritorial | 1998 |