| Design Director Limited | Professional & scientific | 2025 |
| Design Realised (Kent) Limited | Construction | 2011 |
| Design Shop Limited | Hospitality | 2021 |
| Design Simplicity Limited | Wholesale & retail | 2013 |
| Designandinstall Ltd | Construction | 2025 |
| Designer & Ergonomic Seating London Ltd | Wholesale & retail | 2016 |
| Desk Team Limited | Real estate | 2017 |
| Desk Team Serviced Offices Ltd | Real estate | 2022 |
| Desk Team Spaces Ltd | Real estate | 2025 |
| Desna Enterprise Limited | Information & communication | 2023 |
| Destinycity Christian Chapel (DCC) | Other services | 2025 |
| DEV Singhal Racing Limited | Wholesale & retail | 2026 |
| Deva Group-Uk Ltd | Wholesale & retail | 2026 |
| Deva Outreach Limited | Arts & recreation | 2021 |
| Deva Yoga Ltd | Arts & recreation | 2016 |
| Devasya Ltd | Wholesale & retail | 2017 |
| Develop 4 Design Limited | Professional & scientific | 2024 |
| Devill Productions Limited | Professional & scientific | 2005 |
| Dexter Rings Ltd | Manufacturing | 2010 |
| Deya 2018 Ltd | Transport & logistics | 2019 |
| DEZ London Ltd | Wholesale & retail | 2024 |
| DFC Manufacturing Ltd | Wholesale & retail | 2022 |
| DFE Trading Ltd | Wholesale & retail | 2023 |
| DG Properties Woolwich Limited | Real estate | 2022 |
| DGM RTM Company Limited | Households | 2023 |
| Dhan Clean Limited | Administrative & support | 2025 |
| Dhotridotcom Ltd | Information & communication | 2026 |
| Dial 10 Ltd | Information & communication | 2024 |
| Diamond Community Care Limited | Health & social care | 2019 |
| Diamond Radio Holdings Ltd | Information & communication | 2021 |
| Diamond Rentsm Shine Restoration General Services Ltd | Other services | 2025 |
| Diana Griffin-Strauss Limited | Professional & scientific | 2025 |
| Dickinson House RTM Company Limited | Households | 2023 |
| Didi 1969 Ltd | Transport & logistics | 2019 |
| Diesel BTC Limited | Professional & scientific | 2019 |
| DIF (LSE Glengall Road) Holdco Limited | Financial services | 2021 |
| DIF Infra 4 UK Limited | Financial services | 2015 |
| DIF Infra 4 UK Partner Limited | Financial services | 2014 |
| DIF Infra JV UK Ltd | Financial services | 2013 |
| DIF Infra Yield 1 UK Limited | Financial services | 2008 |
| DIF Management UK Limited | Administrative & support | 2008 |
| DIF Tamblin Limited | Financial services | 2017 |
| Different Class Ltd | Education | 2019 |
| Difly Technology Ltd | Extraterritorial | 2026 |
| Digby's Patisserie Ltd | Wholesale & retail | 2009 |
| Digico Consulting Limited | Information & communication | 2014 |
| Digital and Analogue Partners Ltd | Professional & scientific | 2025 |
| Digital Horizon Gateway Ltd | Information & communication | 2024 |
| Digital Horizon Services Ltd | Professional & scientific | 2025 |
| Digital Intelligence Group Limited | Information & communication | 2025 |
| Digital Monitoring Hub Limited | Information & communication | 2021 |
| Digital Oncology Concierge Services Limited | Health & social care | 2023 |
| Digital Orange Networks Limited | Information & communication | 2016 |
| Digital Quanta Limited | Information & communication | 2010 |
| Digitalbio Solutions Limited | Professional & scientific | 2024 |
| Digitallyinformed Ltd | Information & communication | 2022 |
| Digitise Hub Limited | Information & communication | 2016 |
| Digiwoo Group Limited | Education | 2021 |
| Dikko Consulting Ltd | Professional & scientific | 2015 |
| Dillergent Ltd | Information & communication | 2022 |
| Dillon Law LLP | | 2014 |
| Dillon London Limited | Information & communication | 2009 |
| Dillons Technology Consulting Limited | Administrative & support | 2015 |
| DIP J Ltd | Information & communication | 2022 |
| Diptis Threading Bar Ltd | Other services | 2011 |
| Dira London Private Limited | Wholesale & retail | 2019 |
| Dirbay Property UK Ltd | Real estate | 2019 |
| Direct Audio & Visual Hire Ltd | Administrative & support | 2026 |
| Direct Impact Solutions Ltd | Education | 2001 |
| Diri Ltd | Extraterritorial | 2025 |
| DIRT2TIDY Ltd | Administrative & support | 2020 |
| Dirty Astronauts Ltd | Wholesale & retail | 2016 |
| Disegno/Seriale Limited | Professional & scientific | 2015 |
| Distribution Dr-Ime Ltd | Wholesale & retail | 2024 |
| Distribution Services Group Ltd | Construction | 2016 |
| Distro Channels Ltd | Administrative & support | 2023 |
| Disun Food Ltd | Hospitality | 2025 |
| Diverga Ltd | Other services | 2018 |
| Diverse Talent Recruitment Ltd | Financial services | 2023 |
| Diversity Foster Care Limited | Health & social care | 2016 |
| Divertimento Lighting & Restoration Ltd | Administrative & support | 2022 |
| Divine Altar Limited | Other services | 2025 |
| Divine Medics Solutions Limited | Health & social care | 2015 |
| Divinely Called Ministries | Other services | 2018 |
| Divrestore Limited | Transport & logistics | 2025 |
| Dixford Holdings Limited | Real estate | 2019 |
| Dixon-Bassey Limited | Hospitality | 2024 |
| DJ Smile Limited | Wholesale & retail | 2024 |
| DJF Consulting Ltd | Professional & scientific | 2018 |
| DJF Estates Ltd | Real estate | 2023 |
| DJH Training Solutions Limited | Other services | 2010 |
| DJR Haulage Ltd | Transport & logistics | 2015 |
| DK Property & Developments Limited | Real estate | 2024 |
| DKA Property Ltd | Real estate | 2020 |
| DKA Residential Limited | Real estate | 2024 |
| DKH Partners Limited | Professional & scientific | 2023 |
| DKM Management Services Limited | Information & communication | 2025 |
| DKM Sawyerr Limited | Construction | 2013 |
| DKT London Limited | Other services | 2025 |
| Dkthefirst Ltd | Information & communication | 2026 |