| Datamatics HR & Consultancy Ltd | Administrative & support | 2017 |
| Datamatics UK Limited | Information & communication | 2004 |
| Datamato Technologies Limited | Information & communication | 2018 |
| Dataology Ltd | Information & communication | 2019 |
| Datapitch Ltd | Information & communication | 2025 |
| Datasage Limited | Information & communication | 2020 |
| Datastrix Ltd | Information & communication | 2025 |
| Datatech Systems UK Limited | Information & communication | 1994 |
| Datco Limited | Administrative & support | 2016 |
| Datom Engineering Ltd | Administrative & support | 2021 |
| Datta Engineering Consultancy Limited | Mining & quarrying | 2007 |
| Datta Incorporated Ltd | Real estate | 2011 |
| Datta Services Limited | Information & communication | 2023 |
| Dattani Family Ventures Limited | Administrative & support | 2015 |
| Dattani Management Limited | Real estate | 2000 |
| Dattani Services Limited | Information & communication | 2018 |
| Datumatic Ltd | Information & communication | 2003 |
| Daud Construction Ltd | Construction | 2023 |
| Dauphine Court Wealdstone Freehold Company Ltd | Households | 2013 |
| Dauphine Court Wealdstone Management Limited | Households | 1985 |
| DAV Limited | Construction | 2025 |
| Dav&Dom Lettings Ltd | Real estate | 2026 |
| Dave Publications Limited | Information & communication | 2023 |
| Davena Enterprises Ltd | Health & social care | 2010 |
| Davencourt Enterprises Limited | Hospitality | 2008 |
| Davi Foods Ltd | Hospitality | 2022 |
| David 16 Ltd | Construction | 2018 |
| David Abraham Limited | Real estate | 2018 |
| David Abraham Property Investment Limited | Administrative & support | 2018 |
| David and Stone BTL Ltd | Real estate | 2023 |
| David Barnett Associates Limited | Professional & scientific | 1994 |
| David Bitton Limited | Professional & scientific | 2002 |
| David Brierley Limited | Construction | 2019 |
| David Brown Films Limited | Arts & recreation | 1986 |
| David Carnac Financial Services Ltd | Financial services | 2015 |
| David Charles Property Consultants Ltd | Real estate | 2010 |
| David Cooper Associates (Enfranchisement) Limited | Professional & scientific | 2013 |
| David Cooper Associates (Management) Limited | Real estate | 2012 |
| David Cooper Associates (Survey & Valuations) Limited | Real estate | 2013 |
| David Doyle Taxation Limited | Professional & scientific | 2009 |
| David Engellau Music & Audio Limited | Information & communication | 2023 |
| David George Investments Limited | Households | 2016 |
| David Giles Photography Ltd | Professional & scientific | 2005 |
| David Herbert Architects Ltd | Professional & scientific | 2013 |
| David Hutchinson Entertainment Ltd | Arts & recreation | 2021 |
| David Lawrence Consultants Limited | Other services | 2008 |
| David Levene Limited | Professional & scientific | 2002 |
| David Morgan & Co Ltd | Professional & scientific | 2012 |
| David Simon (Holdcob) Limited | Financial services | 2021 |
| David Simon Ltd | Professional & scientific | 2021 |
| David Stock Orthopaedics Limited | Health & social care | 2019 |
| David Varney Design Limited | Professional & scientific | 2017 |
| David Vujanic Ltd | Administrative & support | 2016 |
| Davidconstructions Ltd | Construction | 2025 |
| Davidsofia Limited | Construction | 2025 |
| Davies Brothers Nursery Limited | Agriculture & fishing | 2013 |
| Davinayan Limited | Real estate | 2016 |
| Davjan Ltd | Information & communication | 2022 |
| Davka Food & Drink Resourcing Ltd | Construction | 2018 |
| Davlok Limited | Real estate | 2017 |
| DAW & Co Limited | Financial services | 2022 |
| Dawa Limited | Administrative & support | 2004 |
| Dawes Freehold Ltd | Real estate | 2022 |
| Dawley Ltd | Real estate | 2015 |
| Dawloona Ltd | Wholesale & retail | 2026 |
| Dawn and Dusk Ltd | Financial services | 2026 |
| Dawn and SON Ltd | Real estate | 2023 |
| Dawn Construction Ltd | Construction | 2022 |
| Dawn Percy Limited | Wholesale & retail | 2009 |
| Dawnfinch Limited | Real estate | 1985 |
| Daxa Techs Ltd | Wholesale & retail | 2025 |
| Daxai Limited | Information & communication | 2024 |
| Day & Night Couriers Limited | Transport & logistics | 2022 |
| Daya & Sons Limited | Extraterritorial | 2008 |
| Daya Halai Limited | Information & communication | 2004 |
| Daya Home Improvement Limited | Construction | 2024 |
| Dayan-Demayo Limited | Real estate | 2020 |
| Daybrick Ltd | Construction | 2023 |
| Daylight Reports Ltd | Professional & scientific | 2024 |
| Daysen Ltd | Professional & scientific | 2018 |
| Daysha Investments Limited | Financial services | 2020 |
| DAZ Estates Limited | Real estate | 2019 |
| DB & Co Investments Ltd | Real estate | 2016 |
| DB & PD Property Developments Limited | Real estate | 2024 |
| DB Construction London Ltd | Construction | 2026 |
| DB Contractor Limited | Professional & scientific | 2009 |
| DB Diamonds (UK) Ltd | Wholesale & retail | 2022 |
| DB Films and Animation Limited | Information & communication | 2018 |
| DB Languages Ltd | Professional & scientific | 2023 |
| DB1 Ltd | Wholesale & retail | 2013 |
| Dbd-Boboc Ltd | Transport & logistics | 2026 |
| DBL Scaffolding Services Ltd | Construction | 2005 |
| DBN London Limited | Wholesale & retail | 2021 |
| Dboier Photograph Ltd | Professional & scientific | 2024 |
| Dbrj Limited | Professional & scientific | 2014 |
| DBX Communications Ltd | Wholesale & retail | 2021 |
| DC Connect Ltd | Construction | 2025 |
| DC Consult Limited | Professional & scientific | 2017 |
| DC Globel Limited | Wholesale & retail | 2025 |
| DC Peri Peri Limited | Hospitality | 2021 |