| Debt Support Service Limited | Financial services | 2009 |
| Debtal Architecture Limited | Professional & scientific | 2013 |
| Debtal Construction Limited | Construction | 2023 |
| DEBTHELP4ME Limited | Financial services | 2013 |
| Debtpanel Ltd | Administrative & support | 2017 |
| Debts Solved Limited | Financial services | 2007 |
| Debut Trading Ltd | Wholesale & retail | 2007 |
| Debutch Limited | Wholesale & retail | 2015 |
| DEC13 Consulting Limited | Information & communication | 2014 |
| DEC4DE Construction Ltd | Construction | 2019 |
| DEC4DE Developments Ltd | Real estate | 2017 |
| Decadance Events Ltd | Wholesale & retail | 2018 |
| Decadance Radio Bristol Ltd | Information & communication | 2025 |
| Decadance Radio Ltd | Information & communication | 2020 |
| Decanted Perfumes Ltd | Wholesale & retail | 2026 |
| Decarbon Eaze Ltd | Professional & scientific | 2023 |
| Decasa Interiors Limited | Manufacturing | 2025 |
| Deccan Agency Ltd | Health & social care | 2010 |
| Deccan Fuels Limited | Wholesale & retail | 2016 |
| Deccan Property Partners Ltd | Real estate | 2025 |
| Deccan Urmston Ltd | Hospitality | 2020 |
| December Gifts Ltd | Wholesale & retail | 2024 |
| December Group Limited | Real estate | 2008 |
| December Group Trustee Limited | Financial services | 2024 |
| Decent Cars Hire Ltd | Administrative & support | 2019 |
| Decent CUT Academy Limited | Education | 2019 |
| Decent CUT Limited | Administrative & support | 2009 |
| Decent Limited | Health & social care | 2002 |
| Decently Limited | Information & communication | 2021 |
| Decifyr Ltd | Information & communication | 2026 |
| Decimal Finance UK Ltd | Professional & scientific | 2025 |
| Deck Direct Limited | Wholesale & retail | 2016 |
| Deckchair Properties Ltd | Administrative & support | 2020 |
| Deckchairstripes Ltd | Wholesale & retail | 2007 |
| Decko Ltd | Construction | 2010 |
| Declagram Ltd | Information & communication | 2024 |
| Decland Properties Ltd | Real estate | 2025 |
| Declare Groceries UK Limited | Wholesale & retail | 2023 |
| Decleir Investments Limited | Professional & scientific | 2018 |
| Declerit Ltd | Professional & scientific | 2021 |
| Deco DEN Limited | Wholesale & retail | 2025 |
| Deco Pro MAN Ltd | Construction | 2024 |
| Decodesquare Ltd | Manufacturing | 2022 |
| Decohatch Ltd | Professional & scientific | 2025 |
| Decolonial Dogs CIC | Administrative & support | 2025 |
| Deconint Global Service Ltd | Information & communication | 2023 |
| Decor 4 ALL Ltd | Wholesale & retail | 2025 |
| Decor and Data Ltd | Wholesale & retail | 2022 |
| Decor and Floor Ltd | Construction | 2019 |
| Decor Solutions Ltd | Hospitality | 2023 |
| Decorative Vinyl Doors Limited | Manufacturing | 2005 |
| Decorbyade Ltd | Information & communication | 2020 |
| Decordia Limited | Arts & recreation | 2016 |
| Decorlux Designs Limited | Professional & scientific | 2023 |
| Decorrum Ltd | Manufacturing | 2020 |
| Decorwood Ltd | Manufacturing | 2024 |
| Decoy Ltd | Professional & scientific | 2025 |
| Decoy Media Ltd | Professional & scientific | 2022 |
| Decplay Limited | Information & communication | 1999 |
| Decreations Ltd | Construction | 2024 |
| Decruz Search Ltd | Administrative & support | 2026 |
| Dectrade Ltd | Wholesale & retail | 2021 |
| Decypher UK & IRE Ltd | Wholesale & retail | 2025 |
| Dedee's Spice Hub Enterprises Limited | Wholesale & retail | 2024 |
| Dedicate Music Group Ltd | Information & communication | 2024 |
| Dedicated Security Solutions Ltd | Administrative & support | 2025 |
| DEE - M Consultancy Housing Limited | Real estate | 2016 |
| DEE M Consultancy Ltd | Professional & scientific | 2023 |
| DEE Master Plan Limited | Administrative & support | 2019 |
| Dee's WAX Ltd | Wholesale & retail | 2025 |
| Deecomba Ltd | Information & communication | 2025 |
| Deed Poll Services NW Limited | Other services | 2012 |
| Deedar Ltd | Administrative & support | 2013 |
| Deedee's Childcare Limited | Health & social care | 2017 |
| Deedlease Property Management Limited | Real estate | 1989 |
| Deedlink Property Management Limited | Households | 1987 |
| Deedo Auto Trader Limited | Wholesale & retail | 2026 |
| Deeds Fashion Ltd | Wholesale & retail | 2018 |
| Deejah Services Ltd | Health & social care | 2018 |
| Deekay Technical Recruitment Limited | Administrative & support | 1988 |
| Deeking Intercontinental Limited | Professional & scientific | 2011 |
| Deelcross Limited | Real estate | 2020 |
| Deelofredas Beauty Empire Ltd | Wholesale & retail | 2026 |
| Deeluxe Nest Ltd | Real estate | 2025 |
| Deemand Gifts Ltd | Wholesale & retail | 2011 |
| Deematrix Technologies Limited | Information & communication | 2025 |
| Deemoore Collection Services Ltd | Wholesale & retail | 2019 |
| Deen Drinks Ltd | Wholesale & retail | 2026 |
| Deen Fashions Limited | Wholesale & retail | 2025 |
| Deen Holdings Limited | Wholesale & retail | 2015 |
| Deen Knitwear Ltd | Manufacturing | 2020 |
| Deen Logistics Ltd | Transport & logistics | 2024 |
| Deen Pharm Ltd | Wholesale & retail | 2021 |
| Deenocouriers Ltd | Transport & logistics | 2024 |
| Deens Car Clinic Limited | Wholesale & retail | 2020 |
| Deep Clean Pro Carpet and Upholstery Expert Ltd | Administrative & support | 2025 |
| Deep Construction MCR Ltd | Construction | 2025 |
| Deep Expert Ltd | Information & communication | 2014 |
| Deep Home Private Limited | Real estate | 2026 |
| Deep Life Evolution Hub Ltd | Administrative & support | 2026 |