| Dennison Holdings Limited | Financial services | 2016 |
| Dental Business Support Limited | Health & social care | 2022 |
| Dentist Holdings Limited | Financial services | 2022 |
| Denton & Denton Limited | Professional & scientific | 2022 |
| Derwent Network Services Limited | Information & communication | 2019 |
| Design by US London Limited | Professional & scientific | 2022 |
| Designcraft CNC Limited | Manufacturing | 2025 |
| Designcraft Technology Ltd | Financial services | 2010 |
| Designworx 3D Ltd | Professional & scientific | 2024 |
| Desp Holdings Limited | Financial services | 2020 |
| Determinist Studios Ltd | Professional & scientific | 2021 |
| Devdigital Ltd | Other services | 2020 |
| Devine Distribution Limited | Wholesale & retail | 2018 |
| Devkino Ltd | Information & communication | 2022 |
| Devnett Limited | Professional & scientific | 2015 |
| Devonhurst Properties Ltd | Real estate | 2014 |
| Devoted 2 Detail Ltd | Administrative & support | 2023 |
| Dewanuk Limited | Hospitality | 2018 |
| Dexus Ltd | Construction | 2026 |
| DEZ Timmiss Consulting Limited | Professional & scientific | 2017 |
| DFD Holdings Ltd | Construction | 2026 |
| DGP Investments Limited | Real estate | 2020 |
| DGR Properties Limited | Real estate | 2021 |
| DH Castings Ltd | Manufacturing | 2025 |
| DH Flooring Solutions Ltd | Construction | 2022 |
| DHA Equestrian Services Limited | Professional & scientific | 2007 |
| Di-Spark Limited | Manufacturing | 2021 |
| Diamond Crest Services Ltd | Administrative & support | 2026 |
| Diamond Mobile Gadgets Limited | Manufacturing | 2019 |
| Diamond Safety Limited | Construction | 2012 |
| Diamond Sweepers Limited | Administrative & support | 2021 |
| Dianerose Limited | Public administration | 2024 |
| Didims Logistics Limited | Transport & logistics | 2025 |
| Different Angle Fishing Limited | Agriculture & fishing | 2024 |
| Digicomm Limited | Information & communication | 1996 |
| Digital Batch Limited | Information & communication | 2018 |
| Digital Bits Media Ltd | Professional & scientific | 2018 |
| Digital Means Ltd | Information & communication | 2016 |
| Digital Space Development Limited | Information & communication | 2017 |
| Digital Tax Submissions Ltd | Information & communication | 2026 |
| Digital Twin Productions Limited | Transport & logistics | 2025 |
| Digitalinx Healthcare Ltd | Health & social care | 2023 |
| Digitalvation Ltd | Information & communication | 2020 |
| Dillington House Management Company Limited | Administrative & support | 1998 |
| Dimensions TK Limited | Professional & scientific | 2015 |
| Dimitrov&Son Construction Ltd | Construction | 2019 |
| Dinas Property Solutions Limited | Real estate | 2024 |
| Dinero Enterprise Limited | Wholesale & retail | 2025 |
| Dinton Developments Limited | Construction | 2026 |
| DIP Foods Limited | Manufacturing | 2021 |
| Diprose Associates Limited | Health & social care | 2012 |
| Direct Haulage Solutions Ltd | Transport & logistics | 2022 |
| Direct Tech Ltd | Information & communication | 2025 |
| Dirty Diana's Ltd | Administrative & support | 2023 |
| Disclosure Group Ltd | Information & communication | 2026 |
| Disco-Tech Limited | Arts & recreation | 2018 |
| Discovere Limited | Information & communication | 2007 |
| Display Stands Limited | Wholesale & retail | 2005 |
| Distinctive Automotive Ltd | Wholesale & retail | 2026 |
| District Roofing Solutions Ltd | Construction | 2023 |
| Divas & Dudes Grooming (UK) Ltd | Administrative & support | 2012 |
| Divers UK (International) Ltd | Professional & scientific | 2010 |
| Diverse Hair Design by Jordan Limited | Other services | 2024 |
| Diverse Media North Limited | Professional & scientific | 2020 |
| Diverse Ventures Limited | Administrative & support | 2002 |
| Divine Christian Ministry Ltd | Other services | 2009 |
| Divine Line Decor Ltd | Construction | 2022 |
| Dixon Legal Services Limited | Professional & scientific | 2026 |
| Dixon Searle Partnership (Holdings) Limited | Financial services | 2019 |
| Dixon Searle Partnership Limited | Professional & scientific | 2016 |
| DJ Southern Roofing Ltd | Construction | 2019 |
| DJG Developments Ltd | Construction | 2024 |
| DJP Plumbing and Heating Solutions Ltd | Construction | 2025 |
| DJR Underfloor Heating Ltd | Construction | 2014 |
| DJW Electrical Installations Ltd | Construction | 2019 |
| DJW Electrical Services (UK) Ltd | Manufacturing | 2026 |
| DJW Interiors Ltd | Construction | 2020 |
| DK Planning Services Limited | Real estate | 2007 |
| DKA Services Southern Ltd | Wholesale & retail | 2017 |
| DL Entertainments Limited | Arts & recreation | 2023 |
| DL Roofing Specialists & Sons Ltd | Construction | 2025 |
| DLB Scaffolding Limited | Construction | 2025 |
| Dlcom Ltd | Information & communication | 2022 |
| DLK Beauty Limited | Other services | 2020 |
| DLM Holdings Ltd | Real estate | 2026 |
| Dlrs (Southern) Ltd | Construction | 2025 |
| DM Habens (the Builder) Limited | Construction | 1998 |
| DM Holdings (Hampshire) Limited | Real estate | 2024 |
| DM the Property Consultancy Ltd | Professional & scientific | 2023 |
| DMA Insight Ltd | Information & communication | 2013 |
| DMC3 Willowside Limited | Households | 2017 |
| DMH Property Holdings Limited | Real estate | 2020 |
| DN Pacifica Holdings Ltd | Financial services | 2017 |
| DN Pacifica Leasing Ltd | Wholesale & retail | 2019 |
| DN Pacifica Ltd | Wholesale & retail | 2017 |
| DNA Henley Limited | Health & social care | 2024 |
| DNA Window Solutions Ltd | Manufacturing | 2022 |
| DNK Consultancy Services Limited | Administrative & support | 2016 |
| DNK Ventures Limited | Real estate | 2024 |
| Dobinson Construction Ltd | Construction | 2018 |