| Datamorphosis Technologies Ltd | Information & communication | 2022 |
| Datazen Limited | Information & communication | 2010 |
| Dattani Properties Limited | Real estate | 2020 |
| Daum Properties Ltd | Real estate | 2024 |
| Davenport Resourcing Limited | Administrative & support | 2011 |
| Daves James Limited | Professional & scientific | 2018 |
| Davflo Ltd | Arts & recreation | 2022 |
| David Impey Media Consultants Ltd | Professional & scientific | 2011 |
| David J Shaw Design Services Limited | Professional & scientific | 2015 |
| David Tench Music Limited | Information & communication | 2013 |
| David Turner Property Ltd | Real estate | 2018 |
| Davina's WAX Original Ltd | Other services | 2024 |
| Davis Waters Properties LLP | | 2014 |
| Dawani Investments Ltd | Real estate | 2018 |
| Dawn Property Ltd | Construction | 2023 |
| Dawn Real Estates Ltd | Real estate | 2017 |
| Dawner Investments Limited | Extraterritorial | 2006 |
| Dawner Limited | Real estate | 1987 |
| Daxe Limited | Transport & logistics | 2014 |
| Daxmin Limited | Professional & scientific | 2025 |
| Daxp Consulting Limited | Information & communication | 2025 |
| Daya Healthcare Limited | Hospitality | 2000 |
| Daynor House Limited | Households | 1998 |
| Daypin Property Services Limited | Real estate | 2013 |
| Daysman Consulting Ltd | Professional & scientific | 2012 |
| Dazz-Led Ltd | Wholesale & retail | 2012 |
| Dazzle D C Limited | Health & social care | 2021 |
| Dbaservices Ltd | Households | 2024 |
| Dbiz Management Limited | Administrative & support | 2011 |
| DBM Law Limited | Professional & scientific | 2017 |
| DBM Service and Supply Ltd | Wholesale & retail | 2026 |
| DC Fenman House Ltd | Real estate | 2017 |
| DC Medical Limited | Health & social care | 2015 |
| DC Refurbisment Ltd | Construction | 2025 |
| DC Rock Limited | Real estate | 2020 |
| DC Sports Ltd | Arts & recreation | 2024 |
| Dcar Spread Limited | Financial services | 2013 |
| DCC Construction Ltd | Construction | 2023 |
| DCP Homes Ltd | Real estate | 2020 |
| DD Legal Services Limited | Professional & scientific | 2016 |
| DDC TCG Ltd | Wholesale & retail | 2025 |
| DDF Property Solutions Limited | Real estate | 2020 |
| DDS Digital Solutions Ltd | Information & communication | 2025 |
| DE Blessing Hair Saloon Ltd | Other services | 2023 |
| DE Digital Tech Ltd | Information & communication | 2023 |
| DE Faoite Consultancy Limited | Professional & scientific | 2023 |
| DE Villiers Corporate Advisory Services Limited | Financial services | 2013 |
| Deaforth Limited | Professional & scientific | 2025 |
| Deal Grid Ltd | Wholesale & retail | 2026 |
| Dean Antiques Limited | Wholesale & retail | 2012 |
| Dean International IP Limited | Professional & scientific | 2013 |
| Deanbury Limited | Professional & scientific | 2026 |
| Deans Lane Tyres & Brakes Ltd | Wholesale & retail | 2024 |
| Deans Lane Tyres Ltd | Wholesale & retail | 2017 |
| Deansbrook (Burnt Oak) NO. 4 Residents Company Limited | Households | 1987 |
| Deansbrook Express Ltd | Wholesale & retail | 2024 |
| Deansbrook Management Company Limited | Households | 1998 |
| Deanslanehomes Ltd | Real estate | 2023 |
| Deanslaneproperty Ltd | Real estate | 2021 |
| Debmore Limited | Professional & scientific | 2025 |
| Debt Collection Solutions Ltd | Administrative & support | 2015 |
| Decanimore Limited | Professional & scientific | 2017 |
| Decapolis Properties Ltd | Real estate | 2025 |
| Decatotalism Limited | Administrative & support | 2011 |
| Decent-Beauty UK Limited | Wholesale & retail | 2025 |
| Declan Ruddy Construction Limited | Construction | 2022 |
| Decn Properties Limited | Real estate | 2023 |
| Deco-Design London Limited | Construction | 2019 |
| Decorar Ltd | Wholesale & retail | 2022 |
| Dedham Pharm Limited | Health & social care | 2003 |
| DEE Events Planning and Cuisine Limited | Hospitality | 2012 |
| Deea Project Ltd | Construction | 2020 |
| Deepak International Limited | Other services | 2003 |
| Deeppsyc Ltd | Health & social care | 2020 |
| Deeqa Limited | Public administration | 2024 |
| Defcon Sounds Ltd | Administrative & support | 2026 |
| Defining Services Limited | Real estate | 2019 |
| Degan Market Ltd | Manufacturing | 2026 |
| Delfuoco.Italian Ltd | Hospitality | 2019 |
| Delicate Homespace Ltd | Wholesale & retail | 2020 |
| Delilah RAE Financial Services Limited | Financial services | 2022 |
| Delores Consulting Ltd | Information & communication | 2014 |
| Delta 83 Construction Ltd | Construction | 2019 |
| Delta Kappa NET Consultancy Limited | Information & communication | 1998 |
| Delus Electrical Limited | Construction | 2008 |
| Deluxe Media Apps Limited | Information & communication | 2013 |
| Delwayian Homes Limited | Real estate | 2017 |
| Dema Transport Ltd | Transport & logistics | 2021 |
| Dematix Limited | Administrative & support | 2013 |
| Demco Communications Limited | Administrative & support | 1992 |
| Demet Delivery Services Ltd | Transport & logistics | 2023 |
| Demeter Consultants Ltd | Information & communication | 2024 |
| Demfl Ltd | Construction | 2020 |
| Demix Construction Ltd | Construction | 2018 |
| DEN Properties Limited | Real estate | 2014 |
| Denbas Property Ltd | Real estate | 2024 |
| Dench System Ltd | Wholesale & retail | 2022 |
| Denev Fitness Limited | Arts & recreation | 2015 |
| Denful Limited | Health & social care | 2019 |
| Denian Properties Limited | Real estate | 1972 |