| Demandgenix Limited | Professional & scientific | 2025 |
| Demar Technology Finance Tourism Travel Rental Investment Ltd | Wholesale & retail | 2025 |
| Demcor (NW) Ltd | Construction | 2024 |
| Demcor Ltd. | Construction | 2015 |
| Demdem Ltd | Hospitality | 2024 |
| Demdike Limited | Real estate | 2017 |
| Demdike Stare Limited | Administrative & support | 2011 |
| Demense Road Properties Limited | Other services | 2014 |
| Dementia Care & Support at Home Limited | Health & social care | 2017 |
| Demesne Community Association | Other services | 1996 |
| Demeter and Daughter Limited | Real estate | 2024 |
| Demeter Reports Limited | Administrative & support | 2012 |
| Demeter.Acp Ltd | Health & social care | 2022 |
| Demetrious Holdings Limited | Real estate | 2026 |
| Demezen Ltd | Real estate | 2023 |
| Demi & Chloe Limited | Construction | 2007 |
| Demi Heart Homes Ltd | Real estate | 2025 |
| Demicon Ltd | Construction | 2018 |
| Demicon Space Ltd | Households | 2023 |
| Demilitarise Education Ltd | Professional & scientific | 2019 |
| Demimills Competition's Ltd | Wholesale & retail | 2026 |
| Demir Cardiology Limited | Health & social care | 2025 |
| Demir Construction Company Limited | Construction | 2023 |
| Demiraj Limited | Hospitality | 2024 |
| Demis Mehari Limited | Construction | 2019 |
| Demluxestudio Ltd | Other services | 2023 |
| Demmah Services Limited | Information & communication | 2016 |
| Demo Electrical Services Ltd | Construction | 2021 |
| Demo Group Co., Ltd | Extraterritorial | 2014 |
| Democracy PR Limited | Professional & scientific | 2007 |
| Democratic Education Consultants Ltd | Education | 2015 |
| Demonized UK Limited | Wholesale & retail | 2021 |
| Demoz Forte for Trading Ltd | Wholesale & retail | 2026 |
| Dempsey + Gannon Limited | Professional & scientific | 2020 |
| Demurae Ltd | Wholesale & retail | 2025 |
| DEN Holdings Limited | Real estate | 2018 |
| DEN Unike Plakaten Limited | Wholesale & retail | 2024 |
| Den-Co-Wear Limited | Manufacturing | 1987 |
| Dena Nano Ltd | Manufacturing | 2008 |
| Denautis Ltd. | Administrative & support | 2014 |
| Dence Cooperation Ltd | Wholesale & retail | 2025 |
| Dencoats Properties Limited | Real estate | 2021 |
| Denden Cleaning Ltd | Administrative & support | 2025 |
| Dene House Management Company Limited | Households | 1988 |
| Dene Investments N/W Ltd | Real estate | 2026 |
| Dene Software Testing Limited | Information & communication | 2013 |
| Denefield Place Management Company Limited | Households | 1990 |
| Deneholme Property Investments Limited | Real estate | 1951 |
| Denehurst Estates Limited | Real estate | 2017 |
| Denerion Limited | Information & communication | 2025 |
| Denetcom Limited | Information & communication | 2021 |
| Denewood Limited | Real estate | 2002 |
| Dengs&Mermaid Ltd | Wholesale & retail | 2021 |
| Denholme Estates Ltd | Real estate | 2022 |
| Deni Group Limited | Transport & logistics | 2022 |
| Denim Consultants Ltd | Professional & scientific | 2019 |
| Denim Hub Limited | Extraterritorial | 2015 |
| Denim Merchants (UK) Limited | Wholesale & retail | 2011 |
| Denimhead Ltd | Information & communication | 2026 |
| Denis Firesolution Ltd | Construction | 2018 |
| Denis Major Limited | Real estate | 2012 |
| Denison Court Management Limited | Professional & scientific | 1989 |
| Denkfabrik OTT Ltd | Administrative & support | 2021 |
| Denmark Estates Ltd | Real estate | 2020 |
| Denmark Mill Ltd | Financial services | 2024 |
| Denmedical UK Limited | Administrative & support | 2011 |
| Denmor Construction Limited | Wholesale & retail | 2003 |
| Denmore Industrial NO 1 Limited | Extraterritorial | 2013 |
| Dennformwork Ltd | Construction | 2015 |
| Denning Legal Limited | Professional & scientific | 2012 |
| Dennis Cheng Ltd | Information & communication | 2026 |
| Dennis DEY & SON Limited | Construction | 2007 |
| Dennis Gore (Chemists) Limited | Wholesale & retail | 1959 |
| Dennis Keegan Consulting Limited | Professional & scientific | 2025 |
| Dennis Moore - Care Ltd | Health & social care | 2010 |
| Dennis Pascal Uche Limited | Health & social care | 2014 |
| Dennisanthonynorris Limited | Other services | 2021 |
| Dennison (INT) Petro Chemicals Limited | Water & waste | 2019 |
| Denny Care Services Limited | Health & social care | 2014 |
| Denny Holdings Ltd | Construction | 2026 |
| Denny Morgan Property Limited | Real estate | 2017 |
| Denovo G Limited | Health & social care | 2025 |
| Denovo Health Group Limited | Financial services | 2024 |
| Denovo Health Group Services Limited | Extraterritorial | 2024 |
| Denovo Healthcare Holdings Limited | Health & social care | 2024 |
| Denovo LED Supplies Ltd | Arts & recreation | 2026 |
| Denovo Midco 1 Limited | Extraterritorial | 2024 |
| Denovo Midco 2 Limited | Extraterritorial | 2024 |
| Denovo Nominees Limited | Extraterritorial | 2024 |
| Denovo One to One Limited | Health & social care | 2024 |
| Denovo Sd&A Limited | Health & social care | 2015 |
| Denovo SF Limited | Health & social care | 2025 |
| Denovo Torrington Limited | Health & social care | 2024 |
| Dense REG System Ltd | Professional & scientific | 2025 |
| Denserco Limited | Health & social care | 2010 |
| Denspark Estates Limited | Professional & scientific | 2003 |
| Dent Bricks Ltd | Real estate | 2025 |
| Dent Futures Limited | Education | 2024 |
| Dent Mark Limited | Wholesale & retail | 2020 |
| Dentaesthetics Limited | Health & social care | 2016 |