| D M Stoian Limited | Construction | 2018 |
| D Pereira Ltd | Health & social care | 2014 |
| D Stevens Family Holdings Limited | Real estate | 2018 |
| D&C Building and Domestics Limited | Administrative & support | 2025 |
| D&S Silver Times Ltd | Wholesale & retail | 2018 |
| D. W. Air Conditioning Services Limited | Construction | 2007 |
| D.A. Motors Limited | Wholesale & retail | 1994 |
| D.J. Bradshaw Holdings Ltd | Financial services | 2025 |
| D.L. Stanton Properties Limited | Real estate | 1979 |
| D2 Design & Build Limited | Construction | 2019 |
| D2S Coaching & Services Limited | Professional & scientific | 2022 |
| DA Costa (UK) Ltd | Administrative & support | 1987 |
| DA Motor Works Limited | Wholesale & retail | 2024 |
| Daays AV Ltd | Arts & recreation | 2025 |
| Dadol Ltd | Manufacturing | 2023 |
| DAF Distributions Limited | Transport & logistics | 2019 |
| Daffin Kirbyshire Associates Ltd | Professional & scientific | 2013 |
| Daighbella Asset Management Limited | Real estate | 2023 |
| Dainty London Ltd | Manufacturing | 2018 |
| Dainty London Wholesale Limited | Wholesale & retail | 2024 |
| Daisy & Iris Homecare Ltd | Public administration | 2021 |
| Daisy Chain Home Support Limited | Health & social care | 2010 |
| Daisy Landscaping (Essex) Limited | Construction | 2025 |
| DAL London Homes Ltd | Real estate | 2025 |
| Dalby Building Solutions Ltd | Construction | 2021 |
| Damsa Limited | Other services | 2012 |
| DAN Waller Electrical Services Ltd | Construction | 2026 |
| Dan'Sky Ltd | Manufacturing | 2022 |
| Danash Property Holdings Ltd | Construction | 2024 |
| Danbury Developments Limited | Construction | 2009 |
| Dane TEC Catering and Fabrication Limited | Manufacturing | 2010 |
| Danev&Sons Ltd | Transport & logistics | 2012 |
| Daniel Flavell Ltd | Information & communication | 2009 |
| Daniel Reed Porterfield Limited | Other services | 2019 |
| Dantel Rail Ltd | Administrative & support | 2019 |
| Dantol Ltd | Information & communication | 2014 |
| Dar-Alchand Consulting Limited | Information & communication | 2026 |
| Darbury Ltd | Professional & scientific | 2022 |
| Dare IT Ltd | Information & communication | 2023 |
| Darlea Limited | Professional & scientific | 2020 |
| Dartford Ltd | Hospitality | 2020 |
| Dasal Holdings Limited | Real estate | 1958 |
| Dasal Properties Limited | Real estate | 1962 |
| Data Companion Limited | Information & communication | 2022 |
| Data Driven Demand Limited | Other services | 2018 |
| Data Driven Marketing Ltd | Professional & scientific | 2020 |
| Datarek Business Services Limited | Professional & scientific | 2010 |
| Datum Rail UK Limited | Construction | 2018 |
| Dave Whittle Services Limited | Administrative & support | 2008 |
| David ALI Limited | Construction | 2005 |
| David Dedman Limited | Real estate | 1999 |
| David Hale Films Ltd | Information & communication | 2021 |
| David Malthouse Training Limited | Education | 2013 |
| David Morton Antiques Limited | Wholesale & retail | 1987 |
| David Rose Carpenters Limited | Wholesale & retail | 2006 |
| David Watson Tennis Limited | Education | 2025 |
| Davidest Holdings Ltd | Other services | 2020 |
| Davington Fields (Faversham) Management Company Limited | Households | 2019 |
| Davmaholdings Ltd | Wholesale & retail | 2025 |
| Dawson Business Solutions Limited | Administrative & support | 2010 |
| Day & Night Global Care Limited | Public administration | 2023 |
| Dayadan and Company Ltd | Real estate | 2025 |
| Daydream Media Limited | Arts & recreation | 2026 |
| Daylia Limited | Health & social care | 2023 |
| DBM Property Developments Ltd | Construction | 2014 |
| DBR Fulfilment Ltd | Transport & logistics | 2020 |
| DC Plumbing & Heating Solutions Limited | Extraterritorial | 2017 |
| DC Rail Consulting Ltd. | Professional & scientific | 2012 |
| DC Tyres (Southend) Ltd | Wholesale & retail | 2025 |
| DC Welding & Fabrications (S.E.) Limited | Construction | 2011 |
| DCA Business Recovery LLP | | 2012 |
| DE Freville Limited | Other services | 1997 |
| DE Maniss UK Limited | Wholesale & retail | 1997 |
| DE Santis LLP | | 2021 |
| DE Tasty Mixed Grill Limited | Hospitality | 2019 |
| De-Ath Bros Brickwork and Scaffolding Limited | Construction | 2021 |
| De-Ath Bros Ltd | Professional & scientific | 1995 |
| Dean & Dean Construction Partnership Limited | Construction | 2016 |
| Dean Thompson Ltd | Health & social care | 2026 |
| Deanyclean Exterior Cleaning Services Limited | Administrative & support | 2022 |
| Dearcurves Limited | Wholesale & retail | 2013 |
| Debrox Home Limited | Real estate | 2022 |
| Decoubrough Estates Limited | Professional & scientific | 1995 |
| Dedicated Construction Management Ltd | Construction | 2021 |
| Dedman Limited | Real estate | 2000 |
| Dedman Property Auctions Limited | Extraterritorial | 2011 |
| DEE and JAY Removals Ltd | Transport & logistics | 2016 |
| Dee-Creases Limited | Other services | 2006 |
| Deep in Yoga Ltd | Other services | 2022 |
| Deepdive Coaching Ltd | Professional & scientific | 2026 |
| Deer Village Ltd | Real estate | 2022 |
| Deetone Limited | Financial services | 2023 |
| Defellows Group Limited | Manufacturing | 2022 |
| Defying Gravity AG Limited | Information & communication | 2019 |
| Degenerarte Ltd | Information & communication | 2022 |
| DEI Construction Limited | Construction | 2022 |
| Delicatewings Solutions Ltd | Health & social care | 2025 |
| Dellcliff Ltd | Health & social care | 2023 |
| Deltapoint Properties Limited | Real estate | 2005 |
| DEM Services & Co Limited | Professional & scientific | 2016 |