| DMD Rentals Ltd | Households | 2019 |
| DMM Accounting Ltd | Professional & scientific | 2017 |
| Dmrts Investment Limited | Real estate | 2026 |
| DMX Services Ltd | Construction | 2026 |
| DO IT & Right Ltd | Extraterritorial | 2021 |
| DO Property UK Partners Ltd | Real estate | 2018 |
| Docklands (Domestic Services) Limited | Households | 2001 |
| Dog-Security-Network Ltd | Administrative & support | 2010 |
| Dolores Trade and Invest Ltd | Administrative & support | 2009 |
| Domana Ltd | Construction | 2020 |
| Domestic Bliss Limited | Administrative & support | 1996 |
| Domie Limited | Construction | 2023 |
| Domora Ltd | Real estate | 2025 |
| Donaldson Electrical Services 230 Ltd | Construction | 2025 |
| Donek Limited | Arts & recreation | 2016 |
| Dongguan Jiuyang Machinery Equipment Co., Ltd | Wholesale & retail | 2024 |
| Donnelly Coaching Services Ltd | Construction | 2023 |
| Donovan's Academy of Dance and Theatre Arts Limited | Arts & recreation | 2012 |
| Dont BE Shady Limited | Wholesale & retail | 2019 |
| Doolin Rock Pubs Limited | Hospitality | 2021 |
| DOR & LOR International Courier Ltd | Transport & logistics | 2025 |
| Dornack Logistics Limited | Extraterritorial | 2009 |
| DOT Keedy Designs Limited | Professional & scientific | 2004 |
| Double Barrel Consultancy Services Limited | Professional & scientific | 2018 |
| Double Decors Ltd. | Professional & scientific | 2002 |
| Double Tees Productions Ltd | Information & communication | 2023 |
| Douglas Construction (UK) Limited | Construction | 2003 |
| Dove Invest Ltd | Real estate | 2025 |
| Dove Security Contracts (UK) Ltd | Administrative & support | 2021 |
| Dovercourt Vehicle Sales Limited | Wholesale & retail | 2020 |
| DOW2002 Ltd | Professional & scientific | 2018 |
| Down 2 Earth Garden Services & Maintenance Limited | Extraterritorial | 2005 |
| Dowsing Home Improvements Ltd | Construction | 2011 |
| Doxa Capital Ltd | Financial services | 2025 |
| DPH Healthcare Ltd | Health & social care | 2021 |
| DPJ Scaffolding UK Limited | Construction | 2025 |
| DPK Food & Wine Ltd | Wholesale & retail | 2022 |
| DR Arora Health Limited | Public administration | 2025 |
| DR Blaga Carr Limited | Health & social care | 2025 |
| DR Bushnell & Associates Limited | Administrative & support | 2008 |
| DR Chiara Hunt & Associates Limited | Health & social care | 2016 |
| DR D Varsani Ltd | Health & social care | 2014 |
| DR H I & a Ltd | Health & social care | 2014 |
| DR I Paraskevopoulos Limited | Health & social care | 2008 |
| DR James Health Clinic Limited | Health & social care | 2025 |
| DR Linea Aesthetics Ltd | Other services | 2024 |
| DR Muhammed Limited | Health & social care | 2019 |
| DR N Muhammed Limited | Administrative & support | 2001 |
| DR Project Management Ltd | Construction | 2026 |
| DR V Rossi Ltd | Health & social care | 2023 |
| DR. M Wannenburg Ltd | Health & social care | 2024 |
| Dr.Jenny Parker Ltd | Health & social care | 2021 |
| Draft Link Limited | Wholesale & retail | 2014 |
| DRB Plastering Limited | Construction | 2015 |
| Dreaamart Limited | Arts & recreation | 2023 |
| Dream Digs Ltd | Real estate | 2021 |
| Dream Dwellings Ltd | Real estate | 2025 |
| Dream Field Media Ltd | Professional & scientific | 2026 |
| Dream Hand Investment Limited | Hospitality | 2015 |
| Dream House Building Services Ltd | Construction | 2024 |
| Dreammove Limited | Construction | 2005 |
| Dreams Technologies Hub Private Limited | Information & communication | 2021 |
| Dreams Technologies Limited | Information & communication | 2016 |
| Dreamz Design and Build Ltd | Construction | 2023 |
| Dressbox Fashion Limited | Wholesale & retail | 2024 |
| Driveforward Limited | Transport & logistics | 2007 |
| Drivestar Services Ltd | Transport & logistics | 2021 |
| Driving Skills 786 Limited | Education | 2024 |
| Driving Tuition Limited | Education | 2024 |
| Drmoore Recruitment Limited | Administrative & support | 2026 |
| Drom Jobs Limited | Administrative & support | 2020 |
| Dronic Construction Ltd | Construction | 2013 |
| Drop the Edge Ltd | Wholesale & retail | 2022 |
| DRS Staffing Ltd | Administrative & support | 2025 |
| DRY Cleaning Plus Limited | Other services | 2025 |
| Dry-Spec Flat Roofing Limited | Construction | 2022 |
| Drybax Interiors Limited | Construction | 2009 |
| DS Borehamwood Ltd | Health & social care | 2024 |
| DS Healthcare Ltd | Public administration | 2018 |
| DS Residentials Ltd | Real estate | 2024 |
| DS Testing and Diagnostics Ltd | Professional & scientific | 2025 |
| DSG Sohal Properties Limited | Real estate | 2022 |
| DSK Global Ltd | Wholesale & retail | 2022 |
| DSL Contracts Limited | Construction | 2012 |
| DSP Controls Ltd | Construction | 2018 |
| DSW Project Management Services Limited | Construction | 2017 |
| DT Construction & Carpentry Limited | Construction | 2022 |
| DT Dental Care Limited | Health & social care | 2019 |
| DT Plumbing London Limited | Construction | 2012 |
| Duckett's Buckets Ltd | Wholesale & retail | 2024 |
| DUE Fratelli Ltd | Hospitality | 2019 |
| Duffy-Currid Real Estate Limited | Real estate | 2025 |
| Dukes Waste Management Ltd | Water & waste | 2016 |
| Dunmow Properties Limited | Administrative & support | 2011 |
| Dupuy Flooring Limited | Construction | 2003 |
| DW Business Consultancy Ltd | Professional & scientific | 2016 |
| Dynamic NET Profits Limited | Information & communication | 2008 |
| Dynamic Snowsports Ltd | Education | 2024 |
| Dynamic Star Play Group Limited | Health & social care | 2024 |
| Dynamind Ltd | Information & communication | 2015 |