| Decorum (Cotgrave) Limited | Construction | 2019 |
| Decorum Estates Limited | Real estate | 2006 |
| Decotails Ltd | Wholesale & retail | 2026 |
| Decusatio Ltd | Professional & scientific | 2025 |
| DEE and DEE Services Ltd | Health & social care | 2019 |
| DEE DEE Thai Ltd | Hospitality | 2016 |
| Dee's Books Ltd | Information & communication | 2023 |
| Deecollins Limited | Other services | 2019 |
| Deed Care Limited | Health & social care | 2019 |
| Deedbank (Document Storage) Limited | Professional & scientific | 1997 |
| Deeds Consulting Limited | Professional & scientific | 2016 |
| Deel.Heen Ltd | Wholesale & retail | 2025 |
| Deen Trust | Health & social care | 2024 |
| Deen Trust International | Health & social care | 2020 |
| Deen’S Recruitment Solutions Limited | Health & social care | 2025 |
| Deep Aesthetics Ltd | Health & social care | 2017 |
| Deep Aesthetics MED Spa Ltd | Health & social care | 2025 |
| Deep Clean - Carpet & Upholstery Experts Ltd | Administrative & support | 2015 |
| Deep Clean Nottingham Ltd | Administrative & support | 2016 |
| Deep Cleaning Expert Ltd | Administrative & support | 2024 |
| Deep Holding Investments Ltd | Administrative & support | 2026 |
| Deep Level Ltd | Professional & scientific | 2022 |
| Deep Steam Carpet Cleaning Co. Ltd | Administrative & support | 2023 |
| Deep White Ltd | Wholesale & retail | 2025 |
| Deep Yoga Ltd | Education | 2019 |
| Deep Yoga School Ltd | Education | 2021 |
| Deepa Aesthetic Beauty Limited | Other services | 2025 |
| Deepashikha Associates Ltd | Health & social care | 2023 |
| Deepchem Limited | Wholesale & retail | 2010 |
| Deeprot Events Limited | Professional & scientific | 2019 |
| Deer Designer Ltd | Administrative & support | 2018 |
| Deerhurst Management and Consultancy Ltd | Professional & scientific | 2022 |
| Deerpark Bespoke Carpentry Ltd | Construction | 2023 |
| Dees Side Limited | Construction | 2012 |
| Deesparks Ltd | Construction | 2014 |
| Deess Trading Ltd | Wholesale & retail | 2023 |
| Deetu Consulting Limited | Other services | 2009 |
| Deeya and Khushee Estates Limited | Real estate | 2025 |
| Defiant Enterprises Limited | Health & social care | 1986 |
| Defiant Vibrations Ltd | Arts & recreation | 2024 |
| Definitive Care Consultancy Ltd | Professional & scientific | 2025 |
| Definitive Electrical Solutions Ltd | Construction | 2018 |
| Definitive YOU Ltd | Other services | 2021 |
| Degi Creative Limited | Information & communication | 2024 |
| Dehmos Ltd | Professional & scientific | 2024 |
| Deighton Motor Co. Limited(The) | Transport & logistics | 1914 |
| Deimos AI Ltd | Administrative & support | 2024 |
| Dejas Consultancy Limited | Information & communication | 2008 |
| Dejrah Core Limited | Construction | 2018 |
| Dekkar Properties Limited | Real estate | 2020 |
| Dekma Capital Limited | Professional & scientific | 2019 |
| Dekma Investments Limited | Professional & scientific | 2020 |
| DEL & T Ltd | Real estate | 2025 |
| DEL Cleaning Service Ltd | Administrative & support | 2022 |
| DEL Trionfo Houses Ltd | Real estate | 2025 |
| Delamode Limited | Transport & logistics | 1999 |
| Delden Crane Hire Limited | Professional & scientific | 2008 |
| Delden Cranes Limited | Manufacturing | 1976 |
| Delden Group Holdings Limited | Financial services | 2022 |
| Delden Machinery Limited | Wholesale & retail | 1975 |
| Delex Consulting Ltd | Professional & scientific | 2025 |
| Delford House Designs Limited | Manufacturing | 2001 |
| Delhi Hilltop Ltd | Hospitality | 2025 |
| Delhi Nights Limited | Hospitality | 2019 |
| Deli Continental Limited | Manufacturing | 2009 |
| Deli Fresh Chilled Foods Limited | Extraterritorial | 1998 |
| Deli One Limited | Construction | 2012 |
| Deli-Cious Chocolate Cafe Ltd | Manufacturing | 2025 |
| Delicacy Distribution Ltd | Hospitality | 2025 |
| Delicacy Foods Ltd | Wholesale & retail | 2024 |
| Delicacy of South Asia Ltd | Manufacturing | 2020 |
| Delicious DIM SUM TAN Ltd | Hospitality | 2026 |
| Delicious Treats Ltd | Hospitality | 2011 |
| DELIFOODS25 Limited | Hospitality | 2025 |
| Delight Food Factory Limited | Hospitality | 2025 |
| Delight Logistics Limited | Transport & logistics | 2021 |
| Delightful Adventures Ltd | Wholesale & retail | 2025 |
| Delights of Burton Joyce Limited | Wholesale & retail | 2007 |
| Delilah Fine Foods Limited | Wholesale & retail | 2005 |
| Delings Ltd | Hospitality | 2024 |
| Delirament Building Solutions Ltd | Administrative & support | 2024 |
| Delisoft Ltd | Information & communication | 2017 |
| Delisys Technologies Ltd | Information & communication | 2018 |
| Delity Ltd | Wholesale & retail | 2021 |
| Delivered by Limited | Other services | 2018 |
| Deliveries 4 U Ltd | Other services | 2020 |
| Delivery Ltd | Transport & logistics | 2015 |
| Delivery Solutions Limited | Information & communication | 2012 |
| Della Bella Care Services Limited | Health & social care | 2022 |
| Dellano Services Ltd | Transport & logistics | 2015 |
| Dellogic Ltd | Transport & logistics | 2025 |
| Dellora Property Ltd | Real estate | 2026 |
| Delphinium Larkspur Limited | Wholesale & retail | 2026 |
| Delsim Construction Ltd | Construction | 2019 |
| Delta Bravo Media Ltd | Information & communication | 2025 |
| Delta HAT Limited | Professional & scientific | 2017 |
| Delta Office Automation UK Ltd | Wholesale & retail | 2022 |
| Delta Real Estate Limited | Real estate | 1999 |
| Delta Site Maintenance Limited | Construction | 2025 |
| Delta Tax Services Limited | Professional & scientific | 2011 |