| DI Construct Limited | Construction | 2019 |
| Dial Square Decorating Services Ltd | Construction | 2023 |
| Diamond Cars Camberley Ltd | Transport & logistics | 2024 |
| Diamond Pro Ltd | Construction | 2022 |
| Diamond White Laundry Services Ltd. | Administrative & support | 2020 |
| Diana Moulton Coaching Limited | Professional & scientific | 2013 |
| Diarden Ltd | Professional & scientific | 2022 |
| Dickinson Ballard Limited | Professional & scientific | 2022 |
| Diddy Dunkers Ltd | Education | 2021 |
| Digigrow Ltd | Information & communication | 2024 |
| Digital ARK Ltd | Administrative & support | 2017 |
| Digital Cards Ltd | Information & communication | 2025 |
| Digital Enlightenment Limited | Information & communication | 2010 |
| Digital Fodder Limited | Wholesale & retail | 2015 |
| Dijle GUN Ltd | Hospitality | 2019 |
| Dimeast Ltd | Construction | 2010 |
| Dimecom Limited | Financial services | 2021 |
| Dinak Ltd | Health & social care | 2025 |
| Dinma Limited | Health & social care | 2022 |
| Dinwood Maintenance Limited | Administrative & support | 1978 |
| Diplume Limited | Professional & scientific | 2016 |
| Direct Freight Limited | Wholesale & retail | 2018 |
| Direct Mobility Supplies Ltd | Wholesale & retail | 2007 |
| Dirty Damsel Ltd | Wholesale & retail | 2024 |
| Disability Initiative | Health & social care | 1995 |
| Disability Initiative Services Limited | Health & social care | 1994 |
| Discrete Audio Ltd | Arts & recreation | 2017 |
| Distinction Solutions Limited | Administrative & support | 2021 |
| Diverse Maritime Ltd | Administrative & support | 2025 |
| Diverse Resourcing Limited | Administrative & support | 2025 |
| Dividend Training Limited | Information & communication | 1998 |
| Divine Realty Limited | Real estate | 2019 |
| DIY Homefit Ltd | Wholesale & retail | 2007 |
| DJA Investments Ltd | Extraterritorial | 2023 |
| Djgp Properties Ltd | Real estate | 2024 |
| DJM Linemarkings Ltd | Construction | 2004 |
| DJM Roadmarkings Limited | Extraterritorial | 2011 |
| DJP2026 Ltd | Real estate | 2026 |
| DJS Holdings LLP | | 2025 |
| DM Property Investments Bagshot Ltd | Real estate | 2024 |
| DMD Team Ltd | Transport & logistics | 2023 |
| DNA Visuals Limited | Information & communication | 2003 |
| DO Anything Limited | Administrative & support | 2019 |
| Doctor Motor Limited | Professional & scientific | 2021 |
| Doctors Today Limited | Administrative & support | 2022 |
| Document Output Solutions UK Limited | Information & communication | 1998 |
| DOE London Limited | Wholesale & retail | 2020 |
| Doggy Day Care Home From Home Limited | Agriculture & fishing | 2015 |
| Dogsbody Ltd. | Information & communication | 2015 |
| Dogsbody Technology Limited | Information & communication | 2010 |
| Doharchitecture Limited | Professional & scientific | 2015 |
| Dolphin Head Property Limited | Professional & scientific | 2002 |
| Domatic Limited | Real estate | 1983 |
| Domerod Limited | Professional & scientific | 1988 |
| Dominique Gibbs Ltd Ltd | Professional & scientific | 2019 |
| Domino Cars Limited | Wholesale & retail | 1985 |
| Doneil Ltd | Professional & scientific | 2022 |
| Doodlecats Limited | Wholesale & retail | 2011 |
| Doran Farms Contracting Services Limited | Real estate | 2023 |
| Dorken Builders Limited | Construction | 1975 |
| Dormer Installations Limited | Construction | 2004 |
| Dot-Log Services Ltd | Wholesale & retail | 2013 |
| DOT2.IO Ltd | Administrative & support | 2020 |
| Double M Care Services Limited | Health & social care | 2020 |
| Dovedale Consulting Limited | Professional & scientific | 2022 |
| Dowling Jones Design Ltd | Other services | 2020 |
| Dowman Consulting Limited | Information & communication | 2025 |
| Downplace Property Services Limited | Real estate | 1997 |
| Dozen Innovations Limited | Health & social care | 2026 |
| DPC Properties Limited | Extraterritorial | 2009 |
| Dpictus Limited | Information & communication | 2012 |
| DR a LUK Ltd | Health & social care | 2020 |
| DR Jose Mathew Ltd | Health & social care | 2020 |
| DR K Lothe & Partners LLP | | 2014 |
| DR Nazik Abed Clinic Limited | Health & social care | 2025 |
| Drage Consulting Ltd | Information & communication | 2026 |
| Dragonfly Lettings Ltd | Administrative & support | 2017 |
| Dragonfly Lettings Norwich Ltd | Real estate | 2022 |
| Drake Facilities Ltd | Other services | 2019 |
| DRC Consultancy Limited | Professional & scientific | 2014 |
| Dream Clean Ovens Ltd | Administrative & support | 2017 |
| Dream OUT Loud Limited | Professional & scientific | 2024 |
| Dream Realty Limited | Real estate | 2019 |
| Drhmann Medical Limited | Health & social care | 2017 |
| Drive Precise Ltd | Wholesale & retail | 2023 |
| DRIVE2030 Limited | Extraterritorial | 2021 |
| Drop Dripper Ltd | Wholesale & retail | 2025 |
| DRS Buildings & Supplies Ltd | Construction | 2025 |
| DRT Tiling Ltd | Construction | 2020 |
| Drummond Residents Association Limited | Households | 1966 |
| Drummond Road (Guildford) Residents Association Limited | Households | 1997 |
| DS GAS Services Ltd | Construction | 2018 |
| Dsheen Consultants Ltd | Professional & scientific | 2015 |
| Dsin Ltd | Construction | 2025 |
| Dsthealth Ltd | Professional & scientific | 2026 |
| Dtgt.Global Limited | Information & communication | 2018 |
| Dtrl Ltd | Arts & recreation | 2014 |
| Dualism Training Ltd | Administrative & support | 2021 |
| DUB Festivals Ltd | Arts & recreation | 2026 |
| Duffy Holdings (UK) Limited | Other services | 1988 |