| DH Electrical Services Ltd | Construction | 2023 |
| Dhak Food Ltd | Hospitality | 2024 |
| Dhiman Transport Ltd. | Transport & logistics | 2016 |
| DHJ Traders Ltd | Wholesale & retail | 2024 |
| Dhse Limited | Health & social care | 2007 |
| Dhyanveer Ltd | Information & communication | 2025 |
| Diador Employment Solutions Ltd | Administrative & support | 2009 |
| Dial 4 Taxis Ltd | Transport & logistics | 2016 |
| Dial-A-Char Limited | | 1982 |
| Diambar Construction Ltd | Wholesale & retail | 2020 |
| Diamond Advanced Motorists Limited | Other services | 1992 |
| Diamond Brake Ltd | Wholesale & retail | 2026 |
| Dian Blaydon Ltd | Manufacturing | 2013 |
| Diana & D Legal Advice Ltd | Professional & scientific | 2022 |
| Diana Estate Agents UK Ltd | Real estate | 2020 |
| Didis Global Limited | Professional & scientific | 2022 |
| Dido Securities Limited | Real estate | 1960 |
| Diffusion Environmental Systems Limited | Manufacturing | 2003 |
| Digibubble Limited | Professional & scientific | 2015 |
| Digilock UK Ltd | Administrative & support | 2021 |
| Digital Business Outcomes Ltd | Information & communication | 2025 |
| Digital Business Transformations Ltd | Professional & scientific | 2023 |
| Digital Fieldworks Ltd | Information & communication | 2025 |
| Digital Health Mavens Ltd | Professional & scientific | 2025 |
| Digital Seamstress Limited | Information & communication | 2018 |
| Digital Status Limited | Professional & scientific | 2017 |
| Digitech Automation Ltd | Manufacturing | 2015 |
| Digitex Global Ltd | Information & communication | 2017 |
| Digiweta Ltd | Wholesale & retail | 2025 |
| Dill Limited | Manufacturing | 2026 |
| Dimension 85 Ltd | Information & communication | 2009 |
| Dinesh Nathan Comedian Ltd | Arts & recreation | 2025 |
| Dinosaurs and Dragons Ltd | Education | 2023 |
| Diocese of Arundel & Brighton (Building Services) Limited | Construction | 1991 |
| Diplomat House Dental Care Limited | Health & social care | 2010 |
| Direct Debit Systems Ltd | Information & communication | 2022 |
| Direct Dental Care Limited | Health & social care | 2010 |
| Direct Plumbing and Heating Ltd | Construction | 2018 |
| Direct Works (SMC) Limited | Professional & scientific | 2011 |
| Dirty Racing Events Ltd | Arts & recreation | 2025 |
| Disaster Response Logistics | Professional & scientific | 2005 |
| Disco Hi-Tec U.K. Ltd. | Manufacturing | 1980 |
| Discount Xpress Ltd | Wholesale & retail | 2025 |
| Discovery Training Academy Ltd | Education | 2019 |
| District Cars Meco Ltd | Transport & logistics | 2013 |
| Ditch Brisket Ltd | Hospitality | 2022 |
| Diva Europe Limited | Professional & scientific | 1990 |
| Diversity.Vc Limited | Other services | 2017 |
| Divine Records Limited | Information & communication | 2023 |
| Divine Recovery Ltd | Public administration | 2021 |
| Dixon R&S Care Ltd | Transport & logistics | 2016 |
| Dixons Accounting Services Limited | Professional & scientific | 2014 |
| Diya Trading Ltd | Other services | 2020 |
| DJ Amisha Ltd | Information & communication | 2025 |
| DJ Wedrix Limited | Information & communication | 2025 |
| DJG Construction Services Ltd | Construction | 2020 |
| DJM Support Limited | Health & social care | 2022 |
| DJP Systems Limited | Information & communication | 2010 |
| DJS Home Renovations Ltd | Real estate | 2019 |
| DK F2 Limited | Other services | 2026 |
| DL Freight Ltd | Transport & logistics | 2023 |
| DLC Group International Limited | Arts & recreation | 2026 |
| DLM Fencing & Gardening Services Limited | Administrative & support | 2015 |
| DLV Estates Ltd | Real estate | 2025 |
| DM Cullen Roofing Ltd | Construction | 2020 |
| DMB Future Invest Ltd | Wholesale & retail | 2019 |
| DMT School CIC | Education | 2023 |
| DNA Barlow Ltd | Other services | 2022 |
| DNP Recruitment Limited | Administrative & support | 2025 |
| DNT Enterprise Ltd | Real estate | 2025 |
| Doctor Hijama Ltd | Health & social care | 2025 |
| Dokland Ltd | Other services | 2010 |
| Dolly's Kitchens Ltd | Wholesale & retail | 2024 |
| Dolphin Medical Ltd | Other services | 2010 |
| DOM Services Limited | Construction | 2016 |
| Domepeak Ltd | Wholesale & retail | 2014 |
| Domepeak Presents Ltd | Professional & scientific | 2022 |
| Domi Brothers Ltd | Construction | 2020 |
| Domus Design and Construction Limited | Construction | 2024 |
| Domus Holdings Limited | Real estate | 2018 |
| Domus Property Limited | Real estate | 2002 |
| Donatoli Ltd | Administrative & support | 2024 |
| Donhill Properties Limited | Real estate | 2002 |
| Doosan Digital Innovation Europe Limited | Information & communication | 2014 |
| Doosan Water UK Limited | Construction | 2012 |
| Dorem UK Ltd | Financial services | 2023 |
| Dorking Philharmonia Productions Ltd | Arts & recreation | 2025 |
| Dormy House Ifield Right to Manage Company Limited | Households | 2019 |
| Dorrington Promotions Ltd | Wholesale & retail | 2019 |
| Dorsten Kebab Ltd | Hospitality | 2023 |
| Dorz Accounting Services Ltd | Professional & scientific | 2020 |
| Dorz Care Services Limited | Health & social care | 2020 |
| Dosa Club Ltd | Hospitality | 2023 |
| Dosa Kadai Ltd | Hospitality | 2025 |
| Double Drive Exclusive Limited | Professional & scientific | 2004 |
| Double O Architectural Management Ltd | Professional & scientific | 2021 |
| Doug Chapman Associates Limited | Professional & scientific | 2020 |
| Doves MB Healthcare Limited | Health & social care | 2025 |
| Dovia Solutions Ltd | Construction | 2026 |
| Dowkan Investments Limited | Real estate | 2024 |