| DC Roofing and Maintenance Limited | Construction | 2026 |
| DCA IT and Legal Solutions Limited | Information & communication | 2024 |
| DCE Design Build Limited | Real estate | 2023 |
| DCE Global Limited | Other services | 2007 |
| Dcids Technologies Ltd | Information & communication | 2016 |
| Dcomify Limited | Wholesale & retail | 2024 |
| Dcpc Commercial Agency Ltd | Real estate | 2020 |
| Dcpc Holdings Ltd | Financial services | 2020 |
| Dcrv Construction Limited | Construction | 2019 |
| DCT Communication UK Ltd | Information & communication | 2024 |
| DD Building Services Limited | Construction | 2014 |
| Dd's Kosher Sandwiches Limited | Real estate | 2000 |
| DDF Construction Ltd | Construction | 2021 |
| Ddgbs Ltd | Construction | 2016 |
| DDI Gete Construction Ltd | Construction | 2026 |
| DDL Consultants Limited | Professional & scientific | 2025 |
| DDP Consulting Ltd | Information & communication | 2014 |
| DDP94 Ltd | Construction | 2026 |
| DDQ Capital Limited | Professional & scientific | 2025 |
| DDQ Invest Limited | Administrative & support | 2016 |
| DDR Capital LLP | | 2023 |
| Ddsecurity Limited | Administrative & support | 2015 |
| Ddvr Family Ltd | Transport & logistics | 2026 |
| DE Burger LAB Ltd | Hospitality | 2025 |
| DE Cinelli Construction Ltd | Construction | 2025 |
| DE Silva Arts Ltd | Other services | 2018 |
| DE Silva Properties Ltd | Real estate | 2019 |
| DE Silva Taekwon-Do Limited | Other services | 2005 |
| DE Waal Real Estate Limited | Real estate | 2023 |
| DE5 Tech Limited | Information & communication | 2025 |
| DE: Ream Global Limited | Professional & scientific | 2017 |
| Deal Nova Ltd | Water & waste | 2025 |
| Deal-Uk Limited | Real estate | 2021 |
| Dealfinder Estates Limited | Real estate | 2024 |
| Dealmo Ltd | Wholesale & retail | 2026 |
| Deals on Wheels (LDN) Ltd | Wholesale & retail | 2015 |
| Dean and S Properties Ltd | Real estate | 2020 |
| Dean Drive Trading Limited | Real estate | 2023 |
| Dean Education & Networking CIC | Education | 2025 |
| Dean Electrical Limited | Construction | 2013 |
| Dean Street Developments Limited | Professional & scientific | 2013 |
| Dean Street Management Ltd | Real estate | 2021 |
| Deana Properties Limited | Administrative & support | 2010 |
| Deanbrook Limited | Financial services | 2018 |
| Deans Machines Limited | Wholesale & retail | 2026 |
| Deans Plumbing and Heating Limited | Construction | 2018 |
| Deansgate Surgery Limited | Health & social care | 2019 |
| Dear Eden and Co Ltd | Real estate | 2025 |
| DEB Investments Limited | Real estate | 2011 |
| Debden Developments Limited | Administrative & support | 2018 |
| Deborah Harvey Limited | Wholesale & retail | 2025 |
| Debro Group Limited | Administrative & support | 1990 |
| Dec'Air UK Limited | Wholesale & retail | 2021 |
| Deccan Prime Solicitors LLP | | 2010 |
| Declan Scott Investments and Acquisitions Ltd | Real estate | 2023 |
| Deco Services Limited | Professional & scientific | 2024 |
| Deco Stone and Tiles Ltd | Wholesale & retail | 2023 |
| Decofetch Ltd | Wholesale & retail | 2022 |
| Decor by YOU Limited | Wholesale & retail | 2025 |
| Decorgeous UK Limited | Wholesale & retail | 2024 |
| Decorguru Enterprise Ltd | Manufacturing | 2024 |
| Dedicated Profit Limited | Transport & logistics | 2019 |
| DEE & PEE Services Limited | Construction | 2014 |
| DEE and DEV Construction Ltd | Construction | 2026 |
| Dee-Vine Wholistic Harmony Ltd | Public administration | 2026 |
| Deea Limited | Construction | 2008 |
| Deeas & Company Limited | Real estate | 1985 |
| Deegayu Foods Ltd | Hospitality | 2023 |
| Deekay Medicare Limited | Health & social care | 2017 |
| Deemac Engineering Limited | Real estate | 2000 |
| Deeno Solutions Ltd | Information & communication | 2013 |
| Deens Property UK Ltd | Real estate | 2020 |
| Deep Context Investment Ltd | Real estate | 2022 |
| Deep Green Studio Ltd | Professional & scientific | 2018 |
| Deep Indigo Productions Limited | Information & communication | 1998 |
| Deep NOW Ltd. | Information & communication | 2017 |
| Deep Reason (Defence) Limited | Information & communication | 2025 |
| Deep Reason Limited | Health & social care | 2021 |
| Deep Systems Ltd | Professional & scientific | 2023 |
| Deep Web Records Ltd | Information & communication | 2025 |
| Deepa's Tutoring Ltd | Education | 2022 |
| Deepanand Limited | Real estate | 2006 |
| Deeplearn Consultancy Ltd | Administrative & support | 2025 |
| Deepmark Ltd | Administrative & support | 2022 |
| Deeps Touch Properties Limited | Real estate | 2025 |
| Deepsink Ltd | Professional & scientific | 2024 |
| Deeq Transport Ltd | Transport & logistics | 2025 |
| Deer Creek Intersil (India) UK Limited | Wholesale & retail | 2017 |
| Dees Imports and Exports Limited | Wholesale & retail | 2025 |
| Deesha International Limited | Professional & scientific | 2014 |
| Deeti Estates Ltd | Real estate | 2023 |
| Deeti Investments Ltd | Real estate | 2020 |
| Deevan Lounge Limited | Hospitality | 2016 |
| Deeya Mehta Ltd | Wholesale & retail | 2022 |
| Deeyas Trading Ltd | Wholesale & retail | 2013 |
| DEF Consulting Limited | Information & communication | 1996 |
| Defender Fire Systems Limited | Public administration | 2021 |
| Defendx Fire Systems Ltd | Wholesale & retail | 2024 |
| Deima Funding Limited | Financial services | 2015 |
| Deitch Cooper LLP | | 2012 |