| Datastar Networks Limited | Administrative & support | 2001 |
| Dava Hospitality & Wellness Advisory Ltd | Professional & scientific | 2026 |
| David Austin Consultancy Ltd. | Administrative & support | 2010 |
| David Brown Marketing Ltd | Professional & scientific | 2024 |
| David French Furnishings Limited | Wholesale & retail | 2012 |
| DB Audio Visual Limited | Administrative & support | 2006 |
| DB Developments (Hampshire) Ltd | Construction | 2025 |
| DC22RA Limited | Real estate | 2022 |
| Dcco Ltd | Information & communication | 2009 |
| DCL Facilities Group Ltd | Construction | 2026 |
| DCL Property Services Limited | Construction | 2011 |
| DCR Property Investments Ltd | Real estate | 2013 |
| Dead Pixels Ltd | Information & communication | 2009 |
| Dean Fermie Financial Planning Limited | Professional & scientific | 2018 |
| Dean Tinson Building Contractors Limited | Construction | 2002 |
| Decidable Ltd | Professional & scientific | 2020 |
| Decohomes Limited | Construction | 2010 |
| Defined & Co Limited | Wholesale & retail | 2025 |
| Defsec Definitive Security Options Ltd | Administrative & support | 2024 |
| DEL Industrial Fastenings Limited | Manufacturing | 1974 |
| Delaney Construction Management Limited | Construction | 2025 |
| Delta Tehnic Ltd | Wholesale & retail | 2018 |
| Demicev Limited | Administrative & support | 2026 |
| Depict Consulting Ltd | Professional & scientific | 2024 |
| Dereks Consultancy Ltd | Wholesale & retail | 2015 |
| Derriford House Limited | Health & social care | 1997 |
| Design Expression Ltd | Information & communication | 2012 |
| Design Room Fleet Limited | Manufacturing | 2009 |
| Designify Ltd | Professional & scientific | 2014 |
| Destination Run Coaching Ltd | Education | 2021 |
| Detect Fire Safety Ltd | Professional & scientific | 2015 |
| Dettingen Park Management Company Limited | Households | 2010 |
| Deuce Creative Limited | Information & communication | 2012 |
| Develop My Child Ltd | Health & social care | 2020 |
| Devon House (Fleet) Management Limited | Households | 2021 |
| DFA Studios Ltd | Arts & recreation | 2018 |
| DG Business Limited | Administrative & support | 2025 |
| Dhruthinidhi Limited | Real estate | 2022 |
| Diamond Carpet and Oven Cleaning Ltd | Administrative & support | 2019 |
| Diamond Construction (Hampshire) Ltd | Construction | 2017 |
| Dickcasey Limited | Wholesale & retail | 2023 |
| Digital Dentology Laboratory Limited | Manufacturing | 2021 |
| Digital Marketing Nomads Limited | Professional & scientific | 2022 |
| Digital Tax and Accounting Limited | Professional & scientific | 2016 |
| Diomain Consulting Ltd | Professional & scientific | 2025 |
| Divine Sunrise Assets Ltd | Real estate | 2021 |
| DJS Professional Services Limited | Information & communication | 2016 |
| Dkmd Ltd | Construction | 2015 |
| DM Safety Nets Limited | Construction | 2018 |
| DME Property Services Limited | Construction | 2003 |
| DMT Nails Ltd | Other services | 2026 |
| DNR North London Limited | Real estate | 1988 |
| Doctrina Education Limited | Education | 2017 |
| Dog Walkers Fleet Ltd | Other services | 2023 |
| Dog World Gifts Ltd | Wholesale & retail | 2016 |
| Dogduck Media Ltd | Administrative & support | 2017 |
| Doju Systems Limited | Information & communication | 2026 |
| Dollimore Upholstery Ltd | Other services | 2023 |
| Domabo Marketing Limited | Extraterritorial | 2016 |
| Domestic Carpet and Flooring Ltd. | Construction | 2014 |
| Domican Ltd | Transport & logistics | 2020 |
| Dominic Care Limited | Health & social care | 2010 |
| Dotty Fish Limited | Wholesale & retail | 2010 |
| Douglas Court (Fleet) Limited | Administrative & support | 2005 |
| Douglas House (Farnborough) Residents Management Company Limited | Households | 2015 |
| Downlight Electrical Ltd | Construction | 2019 |
| DOZ Engineering Ltd | Professional & scientific | 2014 |
| Dpce Limited | Extraterritorial | 2018 |
| DPS Clinical Consulting Ltd | Professional & scientific | 2025 |
| DR Finnegan Psychology Limited | Professional & scientific | 2024 |
| DR Helen Evennett Ltd | Health & social care | 2022 |
| Draig Projects Limited | Construction | 2023 |
| Drgc Enterprises Ltd | Transport & logistics | 2013 |
| DRH Aviation Training Limited | Transport & logistics | 2006 |
| Dripps Ltd | Wholesale & retail | 2026 |
| DRONES4U Ltd | Information & communication | 2021 |
| Dropzone Gaming Ltd | Arts & recreation | 2022 |
| Dtlsoft Ltd | Information & communication | 2022 |
| DTX Ltd | Construction | 2023 |
| DTX Recruitment Ltd | Administrative & support | 2025 |
| Duemke Limited | Other services | 2026 |
| Dukes Consulting Ltd | Professional & scientific | 2024 |
| Dunne Ventures Ltd | Financial services | 2023 |
| Durham House Property Investments Limited | Real estate | 2015 |
| Durrells Drycleaners Ltd | Other services | 2019 |
| Dwofreelance Ltd | Transport & logistics | 2024 |
| Dynamic Accounting & Finance Ltd | Professional & scientific | 2023 |
| E Street Retail Limited | Wholesale & retail | 2025 |
| E&E Hospitality Ltd | Professional & scientific | 2022 |
| Earlsbourne Computer Consulting Limited | Information & communication | 1997 |
| Earlswood Park (Bagshot) Management Company Ltd | Households | 2015 |
| Earth Equipment Ltd. | Administrative & support | 2016 |
| Earth to Sky Ltd | Construction | 2021 |
| Earthen Homewares Limited | Wholesale & retail | 2026 |
| East One SIX Ltd | Extraterritorial | 2015 |
| Easter Park Aldermaston Management Limited | Real estate | 2009 |
| Easy Drainage Ltd | Administrative & support | 2026 |
| Easysam Limited | Information & communication | 2007 |
| EAT Local Ltd | Hospitality | 2026 |
| ECM (Electrical Contracting & Maintenance) Limited | Construction | 2014 |