| Dany Build Limited | Construction | 2021 |
| Dapp Limited | Real estate | 2002 |
| Darchini Concepts Ltd | Extraterritorial | 2025 |
| Daremanor Activities Centre Ltd | Health & social care | 2020 |
| Dariusz Grzesiak Limited | Wholesale & retail | 2016 |
| Darkswan Luxury Services Limited | Administrative & support | 2025 |
| Darlows Property Ltd | Real estate | 2023 |
| Darnik Sparkles Ltd | Administrative & support | 2025 |
| Daro Service Transport Ltd | Transport & logistics | 2019 |
| Daro Smart Ltd | Wholesale & retail | 2026 |
| Darren Evans Ltd | Professional & scientific | 2007 |
| Darren's Carpentry Services Ltd | Manufacturing | 2021 |
| Darrington & Co Limited | Professional & scientific | 1998 |
| Darrington Architects Limited | Professional & scientific | 2016 |
| Darryl Marshall Enterprises Ltd | Other services | 2021 |
| Darvall Properties Ltd | Real estate | 2025 |
| Darveshservices Limited | Other services | 2025 |
| Darwin Events, Sport and Leisure Ltd | Arts & recreation | 2013 |
| DAS Mugen Ltd | Professional & scientific | 2024 |
| Daserom Limited | Hospitality | 2024 |
| Data Eagle Ltd | Information & communication | 2024 |
| Data Optics Limited | Information & communication | 2003 |
| Data Privacy Simplified Ltd | Information & communication | 2021 |
| DATA2VAULT Ltd | Information & communication | 2015 |
| Datadialogs Limited | Information & communication | 1994 |
| Datalan 2008 Limited | Information & communication | 2008 |
| Datalu Ltd | Health & social care | 2023 |
| Datamail Networks Limited | Information & communication | 2008 |
| Datapilot Consulting Ltd | Professional & scientific | 2026 |
| Datatel Ltd | Information & communication | 2018 |
| Datateru Ltd | Information & communication | 2026 |
| Datatruth Holding Ltd | Financial services | 2026 |
| Datoja Ltd | Information & communication | 2019 |
| Dauntless Group Ltd | Professional & scientific | 2026 |
| Dave Swinburn Ltd | Information & communication | 2015 |
| Dave the Trimmer Limited | Wholesale & retail | 2015 |
| Dave Wiles Transport Limited | Transport & logistics | 2002 |
| Daventry Thermoforming Holdings Limited | Manufacturing | 2017 |
| David Charles Motor Repairs Ltd | Wholesale & retail | 2021 |
| David French Partnership (Bed)S Ltd | Professional & scientific | 2026 |
| David Harris Consultancy Ltd | Information & communication | 2025 |
| David Hill Wealth Management Limited | Financial services | 2015 |
| David Hoare Contracting Ltd | Financial services | 2011 |
| David Hughes Photography Limited | Other services | 2006 |
| David O Dowd Consultants Ltd | Professional & scientific | 2018 |
| David Richards Engineering Services Limited | Professional & scientific | 2015 |
| David Rogers Consulting Ltd | Administrative & support | 2023 |
| David Russell ESG Ltd | Professional & scientific | 2023 |
| Davidson-Smith & Co Limited | Professional & scientific | 2018 |
| Davies Tech Limited | Professional & scientific | 2026 |
| Davina Shum Ltd | Arts & recreation | 2026 |
| Davina Stubbs Send Consultancy Ltd | Professional & scientific | 2022 |
| Dawson Carpentry & Construction Limited | Construction | 2015 |
| Dawson Law Ltd | Administrative & support | 2014 |
| Dawson Piling Limited | Construction | 1984 |
| Dawson Property Services Limited | Real estate | 2019 |
| Dawson Supplies Ltd | Administrative & support | 2020 |
| Dawsonward Creative Ltd | Other services | 2021 |
| Day Deals Ltd | Wholesale & retail | 2025 |
| Day Spring Energy Investments Ltd | Professional & scientific | 2021 |
| Days Lane Management Company Ltd | Administrative & support | 2017 |
| Dazzlemi Limited | Wholesale & retail | 2025 |
| DB Electrical Installations Ltd | Construction | 2025 |
| DB Marcom Limited | Administrative & support | 1994 |
| DB Parkinson Limited | Construction | 2014 |
| DB Services 2023 Limited | Transport & logistics | 2023 |
| Db-Corrugated Ltd | Manufacturing | 2026 |
| DBA Fire Protection Ltd | Construction | 2024 |
| DBF Construction Limited | Construction | 2004 |
| DBF Developments Bedfordshire Limited | Construction | 2025 |
| DBF Developments Limited | Construction | 2015 |
| DBF Homes Limited | Construction | 2017 |
| DBF Properties Limited | Construction | 2017 |
| Dbit Projects Limited | Information & communication | 2007 |
| DBL Electrical & Property Services Ltd | Construction | 2024 |
| DBO Consultancy Ltd | Professional & scientific | 2018 |
| DBT Associates Ltd | Construction | 2025 |
| Dccc Limited | Other services | 2018 |
| DCM International Limited | Professional & scientific | 2025 |
| Dconcepts Ltd | Financial services | 2024 |
| DCS Global Limited | Professional & scientific | 2020 |
| DCV Plant Services Ltd | Extraterritorial | 2012 |
| DD Games Solutions Ltd | Professional & scientific | 2013 |
| DDA Building Solutions Ltd | Construction | 2025 |
| DDF Building Services Ltd | Construction | 2019 |
| DDPS2000 Ltd | Construction | 2021 |
| Ddrn Properties Limited | Real estate | 2022 |
| DE Catering Ltd | Hospitality | 2017 |
| DE Havilland Pre-School & Nursery Limited | Education | 2016 |
| DE Jure Solicitors Limited | Professional & scientific | 2023 |
| DE Parys Avenue Management Limited | Households | 2004 |
| DE Parys Lodge Maintenance Company Limited | Households | 1974 |
| DE Rubi Patrimonio Familiar LLP | | 2006 |
| De-Ientes Limited | Health & social care | 2015 |
| Deakin & Peck Flooring Limited | Construction | 2019 |
| Dealio Productions Ltd | Information & communication | 2022 |
| Dean & Kendall Financial Services Ltd | Financial services | 2025 |
| Deaway Financial Services Limited | Professional & scientific | 2009 |
| Debolas Kitchen Ltd | Hospitality | 2026 |
| Debs Luxe Care Limited | Health & social care | 2022 |