| Decor Deals Ltd | Wholesale & retail | 2024 |
| Decorhire & DIY Limited | Wholesale & retail | 2002 |
| Decorum Homes Ltd | Real estate | 2018 |
| Deda Logistics Ltd | Transport & logistics | 2020 |
| Dedicatech Ltd | Information & communication | 2014 |
| Dedicated Security Limited | Administrative & support | 2023 |
| DEE & JAY Properties Limited | Real estate | 2021 |
| DEE KAY Enterprises Ltd | Real estate | 2020 |
| DEE KAY Knitwear Ltd | Manufacturing | 2019 |
| Deebee Investments Limited | Wholesale & retail | 2002 |
| Deed's Fisheries Ltd | Hospitality | 2024 |
| Deelavender Health Limited | Health & social care | 2024 |
| Deelgh Limited | Health & social care | 2023 |
| Deen Business Consulting Limited | Information & communication | 2026 |
| Deen Tours Ltd | Administrative & support | 2024 |
| Deen's Bakery Ltd | Hospitality | 2015 |
| Deena Investment Limited | Real estate | 2026 |
| Deens Properties Limited | Real estate | 2003 |
| Deep Property Investments Limited | Real estate | 2019 |
| Deepa Hothi Ltd | Professional & scientific | 2017 |
| Deepa Mistry Limited | Extraterritorial | 2016 |
| Deepam (Leicester) Ltd | Wholesale & retail | 2019 |
| Deepdale Consultants Limited | Professional & scientific | 2023 |
| Deepdive Systems Ltd | Professional & scientific | 2024 |
| Deepdivedoc Ltd | Wholesale & retail | 2025 |
| Deepmani Designer Gallery Ltd | Wholesale & retail | 2022 |
| Deepstop Advisory Ltd | Professional & scientific | 2015 |
| Deercroft Ltd | Wholesale & retail | 2025 |
| Deerfield Properties Ltd | Real estate | 2024 |
| Deerfin Services Ltd | Wholesale & retail | 2025 |
| Deetix Ltd | Arts & recreation | 2022 |
| Deeyadevan (Properties) Limited | Real estate | 2005 |
| Deez Property Ltd | Extraterritorial | 2025 |
| Defconq Ltd | Information & communication | 2023 |
| Defence Law Limited | Professional & scientific | 2011 |
| Defensor Group Limited | Financial services | 2004 |
| Defensor Life Safety Systems Limited | Extraterritorial | 2017 |
| Defensor Limited | Extraterritorial | 2021 |
| Defensor Maintenance Limited | Construction | 1998 |
| Define Group Ltd | Education | 2016 |
| Defining Design Limited | Extraterritorial | 2009 |
| Defleet Leisure & Marketing Ltd | Wholesale & retail | 2018 |
| Defleet Services UK Limited | Wholesale & retail | 2004 |
| Deft Analysis Ltd | Professional & scientific | 2025 |
| Degero Limited | Professional & scientific | 2009 |
| Degree-Six Recruitment Ltd | Administrative & support | 2014 |
| Dehal Clothing Limited | Manufacturing | 2020 |
| Deighton Consulting Ltd | Professional & scientific | 2025 |
| Dekaur Ltd | Arts & recreation | 2023 |
| Deko Investments Limited | Real estate | 2018 |
| Dekonil UK Ltd | Wholesale & retail | 2018 |
| Deks United Company Ltd | Transport & logistics | 2023 |
| Dekton Components (Leicester) Limited | Wholesale & retail | 1975 |
| Dekton Surfaces Limited | Extraterritorial | 2020 |
| Dekxy Ltd | Hospitality | 2025 |
| Delan Engineering Ltd | Manufacturing | 2020 |
| Delani Holdings Limited | Real estate | 2017 |
| Delayed Plane Claims Ltd | Administrative & support | 2025 |
| Deldot Ltd | Construction | 2024 |
| Delhi to Fortkochi Ltd | Hospitality | 2025 |
| Deli 1880 Limited | Administrative & support | 2017 |
| Deli Catering & Co Ltd | Manufacturing | 2025 |
| Deli Flavour Limited | Wholesale & retail | 2005 |
| Deli Time Ltd | Manufacturing | 2020 |
| Delicious Corner Limited | Hospitality | 1999 |
| Delicious Express Ltd | Hospitality | 2019 |
| Delicious Indian Cuisine Ltd | Hospitality | 2018 |
| Delight Cleaning Services Limited | Administrative & support | 2022 |
| Delight Services Limited | Administrative & support | 2018 |
| Delimanjoo Europe Ltd | Real estate | 2005 |
| Delish Syston Ltd | Hospitality | 2022 |
| Deliver Ltd | Administrative & support | 2005 |
| Deliveruk Ltd | Transport & logistics | 2023 |
| Delivery Buddies Limited | Transport & logistics | 2021 |
| Delivery Network Experts Ltd | Transport & logistics | 2016 |
| Delmode Services Limited | Transport & logistics | 2026 |
| Delph Medical Products Holdings Limited | Manufacturing | 2006 |
| Delph Medical Products Limited | Manufacturing | 1988 |
| Delta Bars Limited | Hospitality | 2020 |
| Delta Contracts Midlands Ltd | Construction | 2018 |
| Delta Electrical Contracts Ltd | Construction | 2019 |
| Delta Global Source (UK) Limited | Administrative & support | 2007 |
| Delta Global Source Group Limited | Extraterritorial | 2016 |
| Delta Global Source Holdings Limited | Financial services | 2011 |
| Delta Mini Market KA Ltd | Wholesale & retail | 2025 |
| Delta Transport (UK) Limited | Transport & logistics | 2013 |
| Delta-Therm Limited | Construction | 1989 |
| Deltafirst Ltd | Hospitality | 1998 |
| Deluxe Paan & OFF Licence Ltd | Wholesale & retail | 2024 |
| Delvistin Holdings Ltd | Wholesale & retail | 2017 |
| Delvyz & Sons Ltd | Real estate | 2022 |
| DEM Medical Consultancy Ltd | Health & social care | 2017 |
| Dema Double Glazing Ltd | Construction | 2023 |
| Demann Auto Ltd | Wholesale & retail | 2015 |
| Demax 2018 Ltd | Wholesale & retail | 2018 |
| Demax Construction Limited | Construction | 2018 |
| Dembleby Expertise Ltd | Transport & logistics | 2014 |
| Demcon Limited | Construction | 2018 |
| Dementia Care Services Ltd | Health & social care | 2023 |
| Demetre Studio Ltd | Other services | 2025 |