| DG Glass Architectural Limited | Financial services | 2015 |
| DG Glass Designs Limited | Manufacturing | 2006 |
| DG Training Consultancy Limited | Administrative & support | 2009 |
| DG Transformations Ltd | Professional & scientific | 2022 |
| DGB Professional Services Ltd | Information & communication | 2016 |
| DGI Jointing Services Ltd | Construction | 2026 |
| DGO Healthcare Ltd | Health & social care | 2024 |
| DH Cosmetics Ltd | Wholesale & retail | 2019 |
| DH Global Wine Ltd | Wholesale & retail | 2007 |
| DH3 Woodcote Valley Ltd | Real estate | 2018 |
| Dhan Homes & Commercial Investment Limited | Real estate | 2026 |
| Dhana Deepa Limited | Wholesale & retail | 2023 |
| Dhanam Estates Limited | Real estate | 2025 |
| Dhanju Constructions Ltd | Construction | 2021 |
| Dhantech Ltd | Information & communication | 2017 |
| Dhanya Inflata Limited | Arts & recreation | 2019 |
| Dharjay UK Limited | Real estate | 2025 |
| Dharmajivan Estate Ltd | Real estate | 2022 |
| Dharsini Trading Limited | Hospitality | 2026 |
| Dhiaria Properties Ltd | Real estate | 2024 |
| Dhillon (UK) Limited | Wholesale & retail | 2005 |
| Dhina Properties Ltd | Real estate | 2023 |
| Dhiyan Limited | Wholesale & retail | 2019 |
| Dhorowa Pharma Ltd | Extraterritorial | 2023 |
| Dhotian Investment Limited | Real estate | 2025 |
| Dhruhi Traders Limited | Wholesale & retail | 2026 |
| Dhrun Limited | Wholesale & retail | 2018 |
| Dhuka Brothers Ltd | Real estate | 2022 |
| DIA Team Ltd | Wholesale & retail | 2017 |
| Diabetes and Endocrine Health Ltd | Health & social care | 2020 |
| Diaco & Shania Limited | Administrative & support | 2008 |
| Diacutt Limited | Construction | 2014 |
| Diagonal Media Ltd | Information & communication | 2011 |
| Diagonal Technology Ltd | Information & communication | 2017 |
| Diagrama Children's Services Limited | Health & social care | 2005 |
| Diagrama Foundation-Psychosocial Intervention | Administrative & support | 2007 |
| Diagrama Healthcare Services Limited | Health & social care | 2014 |
| Diagrama Medway Limited | Health & social care | 2014 |
| Dialcom Ltd | Information & communication | 2021 |
| Diallo Care Ltd | Health & social care | 2015 |
| Dialstone Lane (Stockport) Management Limited | Households | 2015 |
| Diamantina Ltd | Wholesale & retail | 2017 |
| Diamond App Ltd | Wholesale & retail | 2022 |
| Diamond CUT Sound UK Ltd | Information & communication | 2025 |
| Diamond Distribution Ltd | Transport & logistics | 2013 |
| Diamond Glass Ltd | Construction | 2010 |
| Diamond Installers Ltd | Construction | 2019 |
| Diamond NP UK Limited | Real estate | 2024 |
| Diamond Place Residents Limited | Households | 2003 |
| Diamond Publishing Ltd | Information & communication | 2002 |
| Diamond Radio Ltd | Information & communication | 2012 |
| Diamond Sealants Limited | Construction | 2021 |
| Diamond Tutors Ltd. | Education | 2020 |
| Diamond Wing Group Ltd | Real estate | 2023 |
| Diamonds Smart Repairs Limited | Other services | 2019 |
| Diamondsoft Consultants International Limited | | 1986 |
| Diana House (Bath) Limited | Households | 1983 |
| Diatton Ltd | Professional & scientific | 2021 |
| Dicevale Limited | Wholesale & retail | 2006 |
| Dickens Heath (Phase 5) Management Company Limited | Households | 2004 |
| Dickinson of London Ltd | Real estate | 2013 |
| Diesel Ventures Ltd | Manufacturing | 2026 |
| Dieugrand Limited | Other services | 2019 |
| Digamma Limited | Professional & scientific | 2007 |
| Digby Court (Birmingham) Management Company Limited | Households | 2014 |
| Digiarmada Ltd | Wholesale & retail | 2026 |
| Digin Eats Ltd | Hospitality | 2020 |
| Digisure Enterprises Ltd | Professional & scientific | 2024 |
| Digital Aurum Ltd | Information & communication | 2010 |
| Digital CAD Dimensions LLP | | 2007 |
| Digital Chronos Ltd | Information & communication | 2014 |
| Digital Education Training Ltd | Education | 2022 |
| Digital Inclusion Technology Group (CST Programmes) Limited | Information & communication | 2006 |
| Digital Inclusion Technology Group (IAP) Limited | Information & communication | 2006 |
| Digital Marketing Lead Solutions Ltd | Professional & scientific | 2008 |
| Digital Onezeroone Ltd | Information & communication | 2021 |
| Digitoile Ltd | Information & communication | 2021 |
| Digivista Consulting Limited | Information & communication | 2017 |
| Dilekcan Professional Services Limited | Real estate | 2007 |
| Dilekcan Property Management Limited | Real estate | 2024 |
| Diligentworks Limited | Information & communication | 2018 |
| Dimiji Ltd | Wholesale & retail | 2021 |
| Dimple News UK Limited | Wholesale & retail | 2022 |
| Dimple the Mistress of Spices Ltd | Hospitality | 2025 |
| Dims Consulting Ltd | Construction | 2025 |
| Dinamic Heights Ltd. | Information & communication | 2025 |
| Dinerman Court Limited | Households | 1983 |
| Dinings SW3 Limited | Hospitality | 2016 |
| Dinno Trans Limited | Transport & logistics | 2018 |
| Diogarnet Ltd | Wholesale & retail | 2023 |
| Diomande Design Ltd | Professional & scientific | 2025 |
| Diomar Meals on Wheels Ltd | Hospitality | 2020 |
| Dipeolu Enterprises Ltd | Wholesale & retail | 2023 |
| Dipka (UK) Limited | Wholesale & retail | 2013 |
| Direct Courier Line Ltd | Transport & logistics | 2021 |
| Direct Learn Easy Ltd | Transport & logistics | 2026 |
| Direct Salon Limited | Wholesale & retail | 2003 |
| Dirrty Store Ltd | Wholesale & retail | 2018 |
| Dirty Crunch LLP | | 2020 |
| Disabilitycroydon | Health & social care | 2009 |