| Davidia Lifestyle Ltd | Education | 2022 |
| Davidson Mathews Limited | Professional & scientific | 2017 |
| Davidson Partners (North East) Limited | Professional & scientific | 2010 |
| Davies Derivatives Ltd | Real estate | 2022 |
| Davina Lovegreen Catering Limited | Hospitality | 2004 |
| Dawn Farrow Ltd | Professional & scientific | 2020 |
| Dayal Management Services Limited | Information & communication | 1998 |
| Dayna Properties Limited | Real estate | 2013 |
| DB Squared Acoustics Limited | Professional & scientific | 2026 |
| DC Associates Consultants Ltd | Professional & scientific | 2014 |
| Dd&M Consulting Limited | Professional & scientific | 2025 |
| DDK Design Group Limited | Construction | 2022 |
| DDK Design Limited | Construction | 2017 |
| DE Coninck Consulting Limited | Administrative & support | 2022 |
| DE Freitas & Co. Accountants Limited | Professional & scientific | 2010 |
| DE Matos & Nicolao Limited | Professional & scientific | 2021 |
| Deaf Accessibility C.I.C. | Education | 2018 |
| Dean Transport Services Ltd | Transport & logistics | 2002 |
| Deanham Consulting Ltd | Other services | 2017 |
| Debbee Dale Development Limited | Professional & scientific | 2014 |
| Debmat Group Limited | Financial services | 2022 |
| Debmat Holdings Limited | Financial services | 2024 |
| Decimals Work Ltd | Administrative & support | 2025 |
| Deckchair.Com Limited | Professional & scientific | 2003 |
| Dedito Boots Limited | Wholesale & retail | 2018 |
| DEE Consulting Limited | Professional & scientific | 2022 |
| Deepsky Leaders Limited | Professional & scientific | 2023 |
| Deeptechx Limited | Professional & scientific | 2021 |
| Degreed Limited | Administrative & support | 2017 |
| Deja Brew Cafe Ltd | Hospitality | 2025 |
| Delport Financial Group Ltd | Professional & scientific | 2018 |
| Delta Roofing Specialist Ltd | Construction | 2026 |
| Demaj TM Ltd | Construction | 2024 |
| Demir Softtech Limited | Administrative & support | 2024 |
| DEN Scoth Developments Ltd | Construction | 2026 |
| Denson Investments Limited | Real estate | 2024 |
| Dental Care London Limited | Health & social care | 2014 |
| Dentistry Inc Ltd | Financial services | 2023 |
| Depth First Workshops Ltd | Information & communication | 2021 |
| Derrick Fung Limited | Information & communication | 1994 |
| Desert Ocean Limited | Construction | 2019 |
| Design by Josh Limited | Arts & recreation | 2016 |
| Design Everything Ltd | Professional & scientific | 2025 |
| DESIGN4YOU Limited | Administrative & support | 2016 |
| Designfreiheit Limited | Professional & scientific | 2014 |
| Designs by HB Limited | Professional & scientific | 2018 |
| Desk Pure Filt Limited | Construction | 2025 |
| Destinations House Ltd | Professional & scientific | 2022 |
| Destinations Marketing House Ltd | Professional & scientific | 2018 |
| Development Guarantee Group Ltd | Financial services | 2021 |
| Development Impact Group Holdings Ltd | Financial services | 2023 |
| Development Impact Group Partners Ltd | Financial services | 2021 |
| Developments in Ribblesdale Ltd | Real estate | 2025 |
| Devereux Boston Limited | Wholesale & retail | 2004 |
| Devoncroft Limited | Real estate | 2021 |
| Devonport Holdings Ltd | Financial services | 2023 |
| Devsecopsfoundry Limited | Information & communication | 2026 |
| Dewe Limited | Real estate | 2023 |
| Dewm Limited | Financial services | 2009 |
| Dexter Private Limited | Transport & logistics | 2024 |
| Dexterity Communications Ltd | Professional & scientific | 2018 |
| Deykin Ltd | Professional & scientific | 2013 |
| Deyodo Ltd | Information & communication | 2022 |
| Dfall Holdings Ltd | Real estate | 2025 |
| DH Property London Limited | Real estate | 2021 |
| Dharma Drum London | Education | 2020 |
| Dholder Solutions Limited | Professional & scientific | 2012 |
| DIA Cleaning Services Limited | Administrative & support | 2023 |
| Diag-Net Limited | Professional & scientific | 2024 |
| Dialstone Capital Ltd | Professional & scientific | 2025 |
| Dialstone Infrastructure Ltd | Professional & scientific | 2025 |
| Diam Software Ltd. | Information & communication | 1998 |
| Diamond Biopharm Limited | Administrative & support | 2005 |
| Diamond Compliance & Quality Limited | Professional & scientific | 2015 |
| Diamond PV Services Limited | Health & social care | 2007 |
| Dick Hawkes Consulting Limited | Professional & scientific | 2011 |
| Digikit Limited | Information & communication | 2024 |
| Digipass Solutions Limited | Information & communication | 2020 |
| Digital Brains Consultancy UK Ltd | Hospitality | 2019 |
| Digital Edge Corporate Finance Limited | Financial services | 2024 |
| Digital Global Ventures Limited | Administrative & support | 2020 |
| Digital Innovation and Growth (DIG) Ltd | Information & communication | 2012 |
| Digital Learning Associates Ltd | Education | 2015 |
| Digital Marketing Management Ltd | Professional & scientific | 2025 |
| Digital Pragma Limited | Information & communication | 2025 |
| Digitally Inherent PVT Ltd | Information & communication | 2026 |
| Digitalone Solutions Ltd | Information & communication | 2021 |
| Digitalvelocitycoach Ltd | Professional & scientific | 2023 |
| Dillon Property Investment Ltd | Real estate | 2020 |
| Dinan and Chighine Limited | Other services | 2007 |
| Dinkd Limited | Information & communication | 2016 |
| Dintgrade Limited | Real estate | 1977 |
| Direct Savings North East Ltd | Professional & scientific | 2016 |
| Direct Scrap Ltd | Wholesale & retail | 2025 |
| Direct-Track Consulting Ltd | Professional & scientific | 2013 |
| DIRECT2LAWYERS Limited | Professional & scientific | 2010 |
| Dirt Bike Extreme Ltd | Wholesale & retail | 2024 |
| Discovering Futures Limited | Education | 2007 |
| Discoveryecta Ltd | Wholesale & retail | 2021 |
| Discretion Management Limited | Wholesale & retail | 2022 |