| DELIVER2U Ltd | Information & communication | 2020 |
| Dellboy Promotions Ltd | Arts & recreation | 2026 |
| Delma Advisors Limited | Professional & scientific | 2025 |
| Delph Links Ltd | Real estate | 2026 |
| Delph Property Management Limited | Real estate | 2000 |
| Delta 60 Ltd | Information & communication | 2026 |
| Delta Core Holdings Ltd | Financial services | 2025 |
| Delta Leads Ltd | Professional & scientific | 2024 |
| Delta Mechanical Services Ltd | Energy | 2026 |
| Delta Precision Engineering Limited | Professional & scientific | 2003 |
| Delta Property & Maintenance Ltd | Construction | 2020 |
| Deluxe Cruises Limited | Administrative & support | 2006 |
| Deluxe DIY Displays Limited | Wholesale & retail | 2024 |
| Delvica Fiberglass Technologies Ltd. | Manufacturing | 2025 |
| Denewood 7 (Freehold) Management Ltd | Households | 2013 |
| Deniable Ltd | Information & communication | 2024 |
| Denis Wick Products Limited | Manufacturing | 1978 |
| Denison Construction Limited | Construction | 2005 |
| Denizdent Consultancy Limited | Manufacturing | 2019 |
| Denkiewicz Design Ltd | Information & communication | 2017 |
| Denmark Developments Ltd | Construction | 2024 |
| Densum Limited | Information & communication | 2019 |
| DENTISTRY@68 Limited | Health & social care | 2011 |
| Dentrans Ltd | Transport & logistics | 2016 |
| Dentrifice Ltd | Manufacturing | 2026 |
| Dentville Properties Ltd | Real estate | 2025 |
| Dereign Limited | Wholesale & retail | 2023 |
| Derrick Holdings Limited | Administrative & support | 1982 |
| Derrick Offshore Limited | Administrative & support | 1994 |
| Desert Plants Ltd | Agriculture & fishing | 2021 |
| Design & Development Associates Limited | Professional & scientific | 2013 |
| Design Decisions Ltd | Professional & scientific | 2025 |
| Designartwow Ltd | Information & communication | 2025 |
| Designlogic Limited | Information & communication | 2005 |
| Designosaur UK Ltd | Professional & scientific | 2015 |
| Desire at Penn Hill RTM Company Limited | Households | 2017 |
| Desk Studio Limited | Professional & scientific | 2010 |
| Destenation Food Limited | Hospitality | 2025 |
| Destiny Fields Limited | Financial services | 2023 |
| Destiny Hairdressing Limited | Other services | 2012 |
| DET Management Limited | Financial services | 2025 |
| Deuce Consultants Limited | Professional & scientific | 2014 |
| DEV Hops Ltd | Information & communication | 2017 |
| Devcomp Ltd | Information & communication | 2002 |
| Deve Connect Ltd | Information & communication | 2025 |
| Devils Brook Limited | Manufacturing | 2021 |
| Devon Care Home Services Limited | Health & social care | 2020 |
| Devon Care Homes Holdings Limited | Financial services | 2015 |
| Devonic Limited | Information & communication | 2025 |
| Devscale Education Limited | Professional & scientific | 2025 |
| Dexter Events Ltd | Hospitality | 2024 |
| Dexter Sports FC C.I.C. | Arts & recreation | 2016 |
| Dextersense Ltd | Professional & scientific | 2018 |
| Dfbs-Fm Ltd | Administrative & support | 2019 |
| Dfer Consultancy Limited | Professional & scientific | 2017 |
| Dfusion Limited | Information & communication | 2010 |
| Dfusion Resourcing Limited | Information & communication | 2010 |
| Dfusion Solutions Limited | Information & communication | 2010 |
| DG Kitchens Ltd | Manufacturing | 2019 |
| DG Resources Ltd | Professional & scientific | 2020 |
| DG Security Service Consultancy Ltd | Administrative & support | 2025 |
| Dggt Limited | Real estate | 2025 |
| Dgmaps Ltd | Wholesale & retail | 2024 |
| DGV Market Limited | Wholesale & retail | 2025 |
| DH Consultancy (Dorset) Ltd | Professional & scientific | 2024 |
| DH UK LP | | 2021 |
| Dharma Centre for Wellbeing Limited | Other services | 2015 |
| DHJ Consultancy Ltd | Professional & scientific | 2026 |
| DHT Networks Ltd | Wholesale & retail | 2025 |
| DI Epoxy Ltd | Manufacturing | 2025 |
| DI Vezio Limited | Real estate | 2022 |
| Diago Ltd. | Manufacturing | 2007 |
| Diakom Digital Ltd | Information & communication | 2025 |
| Dial a CAB Ltd | Transport & logistics | 2020 |
| Dialshark Ltd | Information & communication | 2026 |
| Diamond Automotives Limited | Wholesale & retail | 2011 |
| Diamond Coast Developments Ltd | Construction | 2019 |
| Diamond Elite Limited | Administrative & support | 2004 |
| Diamond International Sports Academy Ltd | Education | 2019 |
| Diamond Security Systems (UK) Limited | Administrative & support | 1999 |
| Diamond Security Systems Limited | Manufacturing | 2010 |
| Diamond Shine Cleaning Limited | Administrative & support | 2015 |
| Diamond Standard Cleaning Ltd | Administrative & support | 2025 |
| Diamond Worx Ltd | Wholesale & retail | 2022 |
| Diane Hudson Accountancy Ltd | Professional & scientific | 2012 |
| Diapp Ltd | Information & communication | 2022 |
| Dibben & Sons Ltd | Construction | 2020 |
| Dibben's Street Food Catering Ltd | Hospitality | 2024 |
| Dibbsy Mechanical Services Limited | Wholesale & retail | 2021 |
| Dickensons Autos Limited | Wholesale & retail | 2024 |
| Dickson Building Services Ltd | Construction | 2024 |
| Didsbury Estates Limited | Real estate | 2021 |
| Diego Barros Investments Ltd | Financial services | 2021 |
| Diego Barros Limited | Arts & recreation | 2021 |
| Digger Parts Direct Ltd | Wholesale & retail | 2015 |
| Digi-Business Ltd | Information & communication | 2020 |
| Digiarcheo Limited | Other services | 2024 |
| Digiseed Ltd | Professional & scientific | 2021 |
| Digital BM Limited | Wholesale & retail | 2025 |
| Digital Canary Ltd | Information & communication | 2026 |