| Dervish Connections Ltd | Professional & scientific | 2021 |
| Design & Post Ltd | Information & communication | 2010 |
| Design 2 Production Ltd | Construction | 2014 |
| Design Build Acoustics Ltd | Construction | 2025 |
| Designco Ltd | Information & communication | 2017 |
| Designer Management Limited | Real estate | 2002 |
| Detta Consulting Ltd | Professional & scientific | 2023 |
| Devgroop Limited | Information & communication | 2017 |
| Devole Investments Ltd | Real estate | 2023 |
| Dggmc Ltd | Hospitality | 2024 |
| Dhcc Limited | Construction | 2017 |
| DHP Services Limited | Construction | 1995 |
| Dhuna Properties Limited | Real estate | 2014 |
| Diamond Airport Parking Ltd | Transport & logistics | 2023 |
| Diamond Property Rentals Limited | Administrative & support | 2009 |
| Diamond Vacations Ltd | Administrative & support | 2022 |
| Diamondpanda Media Limited | Professional & scientific | 2019 |
| Diebelius Roofing Limited | Administrative & support | 2014 |
| Diesel Care Ltd | Manufacturing | 2014 |
| Diesel Engine Services Ltd | Manufacturing | 2009 |
| Digby's Consultancy Ltd | Professional & scientific | 2026 |
| Digital Asset Emporium Limited | Arts & recreation | 2019 |
| Direct Display Europe Limited | Other services | 1996 |
| Direct Valeting & Detailing Ltd | Extraterritorial | 2025 |
| Dirty Drops Ltd | Information & communication | 2025 |
| Disaster Management Services (UK) Limited | Administrative & support | 2012 |
| Disios Motor Services Ltd | Wholesale & retail | 2019 |
| Divergentmind Coaching Ltd | Education | 2026 |
| Divine Care Group Ltd | Health & social care | 2018 |
| Diyanah Nurture Limited | Health & social care | 2025 |
| DJ Scott Building Services Limited | Construction | 2014 |
| DJH Aviation Consultants Limited | Professional & scientific | 2026 |
| DJN Plumbing Services Ltd | Construction | 2017 |
| DJR Electrics Limited | Construction | 2025 |
| DK & M Holdings Limited | Financial services | 2025 |
| DK & M Property Group Limited | Real estate | 2026 |
| DKW Service Solutions Ltd | Construction | 2009 |
| DLB SAT Ltd | Construction | 2018 |
| DLC Financial Solutions Limited | Financial services | 2019 |
| DLW Products Ltd | Wholesale & retail | 2026 |
| DM Consultants Services Limited | Administrative & support | 2025 |
| DM Global Solutions Ltd | Financial services | 2023 |
| DM Heritage Homes Ltd | Real estate | 2025 |
| DMA Surveying & Disputes Services Ltd | Professional & scientific | 2026 |
| DMB Digital Ltd | Information & communication | 2017 |
| DMC Carpenters Limited | Manufacturing | 2023 |
| DMK Business Solutions Ltd | Professional & scientific | 2022 |
| DMM Property Services Ltd | Construction | 2006 |
| DMS (Legal Services UK) Ltd | Other services | 2021 |
| DMS Response Limited | Professional & scientific | 2025 |
| DNA Heating Services Limited | Construction | 2021 |
| DOA Service Limited | Wholesale & retail | 2022 |
| Dodds Distribution Limited | Wholesale & retail | 2023 |
| Dofoy Estates Ltd | Real estate | 2024 |
| Dog Collective Limited | Arts & recreation | 2012 |
| Doggy Armour Ltd | Wholesale & retail | 2016 |
| Domingo Staff Agency Ltd | Administrative & support | 2002 |
| Dominic Chinea Limited | Administrative & support | 2014 |
| Domus Vestra Ltd | Real estate | 2024 |
| Donna Williams Coaching Ltd | Professional & scientific | 2026 |
| Donovan Trading Limited | Professional & scientific | 2012 |
| Doug M Scaffolding Ltd | Construction | 2025 |
| Doughpamine Limited | Hospitality | 2025 |
| Doylediary Ltd | Information & communication | 2024 |
| DP Baillie Ltd | Real estate | 2025 |
| DPL Production Lighting Limited | Other services | 1999 |
| Dprr Limited | Real estate | 2023 |
| DPS Property Services Limited | Construction | 2017 |
| DR Emily Strong Medical Aesthetics Limited | Health & social care | 2023 |
| DR Nicola Thorne Psychology Services Ltd | Health & social care | 2020 |
| DR Rachel Gibbons Limited | Health & social care | 2020 |
| Dragons Lair LLP | | 2006 |
| DRB Electrical Ltd | Energy | 2012 |
| DRC Heating & Plumbing Ltd | Construction | 2021 |
| Drewna Limited | Professional & scientific | 2016 |
| Drive by Mobile Tyres Ltd | Wholesale & retail | 2023 |
| Drivetek Recruitment Limited | Administrative & support | 2018 |
| Drlc Ltd | Professional & scientific | 2016 |
| Drop Kerb Essex Limited | Construction | 2024 |
| DS Site Services Ltd | Construction | 2011 |
| Dsear Consulting LLP | | 2019 |
| DSF Catering Ltd | Hospitality | 2025 |
| DT Heating & Plumbing Ltd | Construction | 2023 |
| Duct Solutions Ltd | Construction | 2024 |
| Duke Girls Limited | Hospitality | 2008 |
| Dunhart Limited | Construction | 2020 |
| DUO Homes Ltd | Real estate | 2025 |
| DW Audio Ltd | Wholesale & retail | 2026 |
| DWH Plastering Limited | Construction | 2018 |
| Dwyers Beverages (UK) Co., Ltd | Wholesale & retail | 2022 |
| Dyamond Star Ltd | Construction | 2023 |
| Dylan's Burgeria Limited | Information & communication | 2023 |
| Dynamic 1ST Management Ltd | Arts & recreation | 2017 |
| Dynamic Assistant Ltd | Administrative & support | 2025 |
| Dynamic Bear LLP | | 2024 |
| Dynamico Limited | Wholesale & retail | 2011 |
| DZ RUM Ltd | Manufacturing | 2025 |
| E & J Waughman Property Maintenance Ltd | Construction | 2017 |
| E P Davey Electrical Ltd | Construction | 2023 |
| E. H. Taylors LLP | | 2013 |