| Definition Agency Limited | Professional & scientific | 2006 |
| Definition Group Limited | Professional & scientific | 2022 |
| Definitive Ltd | Wholesale & retail | 2017 |
| Definitive Style Ltd | Wholesale & retail | 2026 |
| Defusion Studios Limited | Information & communication | 2013 |
| Deganwy Quay Ltd | Hospitality | 2001 |
| Dehnow Properties Limited | Real estate | 2026 |
| Dejazz Ltd | Wholesale & retail | 2024 |
| Dekamed Limited | Health & social care | 2021 |
| Dekato Technology Limited | Professional & scientific | 2016 |
| DEL Bar Hospitality Limited | Hospitality | 2026 |
| DEL Knowles Farming Ltd | Agriculture & fishing | 2023 |
| Delal Grill Limited | Hospitality | 2019 |
| Delancey Propco Limited | Hospitality | 2026 |
| Delete Method Academy Ltd | Education | 2026 |
| Delgate Limited | Real estate | 1973 |
| Deli 168 Ltd | Hospitality | 2024 |
| Deli Chez (Leeds) Ltd | Hospitality | 2020 |
| Deli Kitchen Leeds Ltd | Hospitality | 2024 |
| Deli NO.1 Whitehall Place Limited | Hospitality | 2018 |
| Deli Snacks Roundhay Ltd | Hospitality | 2025 |
| Delicate Nails Ltd | Administrative & support | 2025 |
| Delifresh Limited | Hospitality | 2002 |
| Delight African Foods Limited | Hospitality | 2026 |
| Delight Desserts Leeds Limited | Wholesale & retail | 2025 |
| Delight Events Supplies Ltd | Hospitality | 2024 |
| Delight Foods Ltd | Wholesale & retail | 2012 |
| Delightful Desserts Leeds Ltd | Hospitality | 2025 |
| Delightlogic Ltd | Information & communication | 2025 |
| Delileeds Limited | Hospitality | 2024 |
| Delivered FM Ltd | Extraterritorial | 2017 |
| Delivered Safe and Sound Limited | Transport & logistics | 2006 |
| Deliveree Trading Ltd | Hospitality | 2016 |
| Delivering Projects Limited | Information & communication | 2013 |
| Delivery Management Consulting Ltd | Other services | 2019 |
| Delivery Quote Ltd | Transport & logistics | 2026 |
| Dell Parker Ltd | Wholesale & retail | 2020 |
| Dellcorp Trading Limited | Real estate | 2022 |
| Dellia International Ltd | Professional & scientific | 2020 |
| Dello Argo Ltd | Hospitality | 2025 |
| Delos Operations Ltd | Administrative & support | 2025 |
| Delphi Recruitment Ltd | Administrative & support | 2017 |
| Delphinus Investments Limited | Financial services | 2020 |
| Delta Accounting Ltd | Professional & scientific | 2016 |
| Delta Claims Services Limited | Financial services | 2009 |
| Delta Consulting Services Group Limited | Information & communication | 2017 |
| Delta Fluid Technology Limited | Wholesale & retail | 2012 |
| Delta Peak Holdings Limited | Professional & scientific | 2023 |
| Delta Power Engineering Ltd | Construction | 2024 |
| Delta Time Ltd | Extraterritorial | 2014 |
| Deltabloc UK Limited | Construction | 2010 |
| Deltatherm Leeds Ltd | Construction | 2026 |
| Deltic Electrical Ltd | Construction | 2021 |
| Deluxe Build Developments Ltd | Construction | 2024 |
| Deluxe Carpets Limited | Wholesale & retail | 2019 |
| Deluxe Grass Ltd | Wholesale & retail | 2025 |
| Deluxe Linens Ltd | Wholesale & retail | 2020 |
| Deluxe Paan Parlour and OFF Licence Ltd | Wholesale & retail | 2025 |
| Deluxex Services Ltd | Wholesale & retail | 2025 |
| Delzoppo Consulting Ltd | Information & communication | 2026 |
| DEM Leisure Limited | Hospitality | 2019 |
| Demech 2 Ltd | Construction | 2017 |
| Demech Leeds 2 Limited | Construction | 2019 |
| Demech Leeds Limited | Construction | 2019 |
| Demech Properties (2) Limited | Administrative & support | 2017 |
| Demech Properties Limited | Households | 2007 |
| Demeter Brothers Construction Limited | Construction | 2024 |
| Demex Limited | Construction | 1976 |
| Demisola Limited | Professional & scientific | 2013 |
| Demm Commercial Services Ltd | Administrative & support | 2025 |
| Demo Face Ltd | Information & communication | 2019 |
| Demoladidit Beauty Limited | Other services | 2024 |
| Demolition Services Group Limited | Construction | 2011 |
| Demolition Services Limited | Construction | 1980 |
| Demon Leisure Limited | Hospitality | 2014 |
| Demon Leisure Partners LLP | | 2019 |
| Demonserver Ltd | Information & communication | 2008 |
| Demotic Limited | Information & communication | 2006 |
| Dempsey Dyer Limited | Manufacturing | 1977 |
| Dempsey Generations Ltd | Professional & scientific | 2013 |
| Dempster Investments Limited | Real estate | 2022 |
| Demtech Services Leeds Ltd | Construction | 2020 |
| Demy Corp Ltd | Information & communication | 2025 |
| DEN Architecture Ltd | Professional & scientific | 2012 |
| DEN Brook Energy Limited | Energy | 2012 |
| DEN EYE Care Limited | Health & social care | 2022 |
| Dena BMD Limited | Manufacturing | 2020 |
| Dena Building Technology Limited | Professional & scientific | 2013 |
| Dena Energy Ltd | Professional & scientific | 2013 |
| Dena Family of Companies Ltd | Professional & scientific | 2021 |
| Dena Modular Buildings Limited | Construction | 2020 |
| Denada Dance Theatre Ltd | Arts & recreation | 2023 |
| Denbec Fabrications Ltd. | Manufacturing | 2002 |
| Denby Dale Estates Limited | Other services | 1954 |
| Denby Project Investments Limited | Administrative & support | 2019 |
| Denden Unisex Salon Ltd | Other services | 2019 |
| Dene House Court Management Company Limited | Households | 1997 |
| Deneco Ltd | Hospitality | 2019 |
| Denero Limited | Hospitality | 2019 |
| Denerosharmainecare Ltd | Agriculture & fishing | 2025 |