| DD Surgical Ltd | Health & social care | 2021 |
| DE Molai Limited | Wholesale & retail | 2018 |
| DE Wilmslow Taxi Ltd | Transport & logistics | 2023 |
| DE-F9 Auto Ltd | Professional & scientific | 2025 |
| Deafcls Ltd | Administrative & support | 2024 |
| Dealpedia Limited | Information & communication | 2025 |
| Dealship Ltd | Wholesale & retail | 2025 |
| Dean Priday Building Services Limited | Construction | 2013 |
| Dean Property (Burnley) Limited | Real estate | 2019 |
| Dean Property (North East) Limited | Real estate | 2021 |
| Dean Property Estates Limited | Real estate | 2012 |
| Dean Property Group Limited | Real estate | 1963 |
| Dean Property Services (North) Limited | Real estate | 2016 |
| Deandale Ltd | Hospitality | 2026 |
| Deano Foods Ltd | Manufacturing | 2025 |
| Deas Events Limited | Hospitality | 2021 |
| Debbie Shaw Orthopaedics Limited | Health & social care | 2019 |
| Deck Kingdom Limited | Wholesale & retail | 2022 |
| Deen Pharma Ltd | Health & social care | 2024 |
| Deer Park (Accrington) Management Company Limited | Households | 2017 |
| Deerwood Fold (Lucas Lane) Management Company Limited | Households | 2023 |
| Deesigns Limited | Real estate | 2018 |
| Delamere Lodge RTM Company Limited | Households | 2024 |
| Delight Plus Care Ltd | Health & social care | 2023 |
| Delivered Time Limited | Real estate | 2002 |
| Delondra Oncology Ltd | Professional & scientific | 2018 |
| Delonix Medical Affairs Ltd | Professional & scientific | 2024 |
| Delta Property Group Ltd | Real estate | 2025 |
| Deluxe Homes Ltd | Real estate | 2017 |
| Deluxesquare Limited | Real estate | 1996 |
| Demand Attire Ltd | Wholesale & retail | 2017 |
| Denehurst Care Limited | Health & social care | 1994 |
| Denmoss Ltd | Financial services | 2000 |
| Denning Consulting Ltd | Health & social care | 2011 |
| Dental Founders Club Limited | Health & social care | 2026 |
| Dental Studio Group Holdings Limited | Health & social care | 2026 |
| Dentalcare (Southern) Ltd | Health & social care | 2012 |
| Dentalcare Academy Ltd | Health & social care | 2025 |
| Dentalcare Bath Ltd | Health & social care | 2019 |
| Dentalcare Berinsfield Ltd | Health & social care | 2018 |
| Dentalcare Brackley Ltd | Health & social care | 2018 |
| Dentalcare Group Ltd | Health & social care | 2016 |
| Dentalcare Hook Ltd | Health & social care | 2018 |
| Dentalcare Langley 2 Ltd | Health & social care | 2019 |
| Dentalcare Langley Ltd | Health & social care | 2018 |
| Dentalcare Limited | Health & social care | 2006 |
| Dentalcare Marlborough Ltd | Health & social care | 2019 |
| Dentalcare Partnership Limited | Extraterritorial | 2008 |
| Dentalcare Reading Ltd | Extraterritorial | 2022 |
| Dentalcare Swindon Central Limited | Extraterritorial | 2019 |
| Dentalcare Swindon Ltd | Health & social care | 2018 |
| Dentalcare Top Co (UK) Limited | Health & social care | 2026 |
| Dentalcare West Swindon Ltd | Health & social care | 2018 |
| Dentalcare Westbury Ltd | Health & social care | 2018 |
| Dentalcare Winterbourne Limited | Health & social care | 2019 |
| Dento Aesthetics Ltd | Health & social care | 2020 |
| Dentro & Fuori Ltd | Wholesale & retail | 2016 |
| Derby Shoulder Surgery LLP | | 2011 |
| Derek Bennett Engineering Limited | Manufacturing | 2021 |
| Derm Connect Limited | Health & social care | 2025 |
| Derm West Lancs Ltd | Health & social care | 2023 |
| Dermatology for YOU Limited | Health & social care | 2021 |
| Design Management Services Limited | Professional & scientific | 2016 |
| Designerwave Limited | Wholesale & retail | 2017 |
| Destination Padel Limited | Arts & recreation | 2023 |
| Detoney Limited | Health & social care | 2015 |
| Devden Limited | Health & social care | 2024 |
| Developmaint Ltd | Professional & scientific | 2024 |
| Devinejam Ltd | Professional & scientific | 2024 |
| Devotus Ltd | Professional & scientific | 2022 |
| DGG Medical Limited | Health & social care | 2017 |
| Dgtx Ltd | Information & communication | 2019 |
| DH Homes Ltd | Construction | 2016 |
| Dhawan Properties Limited | Real estate | 2019 |
| DHC Utilities Limited | Water & waste | 2018 |
| DHF Falconer Limited | Financial services | 2024 |
| DHM (Holdings) Limited | Financial services | 2017 |
| Dhrti Limited | Health & social care | 2023 |
| Diamond Data Management Ltd | Information & communication | 2015 |
| Diamond EA Ltd | Professional & scientific | 2019 |
| Diani Group Ltd | Health & social care | 2026 |
| Diani Ltd | Professional & scientific | 2026 |
| Didcot Dental Group Ltd | Health & social care | 2022 |
| Didsbury Engineering Co.Limited | Manufacturing | 1941 |
| Didsbury Shoes Ltd. | Wholesale & retail | 2016 |
| Diffuse Fashion (UK) Limited | Real estate | 2012 |
| DIG IT Plant Hire and Sales Limited | Financial services | 2015 |
| DIG Trip Ltd | Information & communication | 2025 |
| DIG2011 Limited | Information & communication | 2023 |
| Digi-Steps Limited | Information & communication | 2022 |
| Digilectual Ltd | Information & communication | 2013 |
| Digital Matchbox Ltd | Information & communication | 2012 |
| DIL & SAM Anaesthetics Limited | Health & social care | 2024 |
| DIP Newco. Limited | Transport & logistics | 2000 |
| Direct Management Services Limited | Administrative & support | 1986 |
| Disclosure Services Ltd | Other services | 2001 |
| Dispatch Bike Supply Ltd | Wholesale & retail | 2026 |
| Distinctive Leisure Limited | Hospitality | 2018 |
| DJ Residential Holdings Ltd | Real estate | 2025 |
| DJM Capital Ltd | Real estate | 2024 |