| Dark Star Petroleum Limited | Mining & quarrying | 2011 |
| Darvell's Joinery Limited | Construction | 2005 |
| Darvims Limited | Real estate | 2020 |
| Darwin Security Limited | Administrative & support | 2009 |
| Darwood Building Services Limited | Construction | 2013 |
| DAS Carpentry Ltd | Manufacturing | 2026 |
| DAS Group International Ltd | Wholesale & retail | 2023 |
| DAS Invest Ltd | Real estate | 2017 |
| Dasgood Studios Ltd | Information & communication | 2025 |
| Dasi Construct Limited | Construction | 2018 |
| Data Ethics Limited | Information & communication | 2026 |
| Data Security Solutions Limited | Professional & scientific | 2013 |
| Data Services Consulting Limited | Information & communication | 2025 |
| Data Systems Evolution Ltd | Information & communication | 2018 |
| Datacentres Limited | Information & communication | 2006 |
| Datacollect Limited | Information & communication | 2024 |
| Datacomms Services Ltd | Information & communication | 2018 |
| Datactive Group Ltd | Information & communication | 2024 |
| Datalytica Consultants PVT Ltd | Information & communication | 2019 |
| Datanetrix Limited | Professional & scientific | 2022 |
| Datapulse Integrations Ltd | Information & communication | 2023 |
| Datocracy Ltd | Information & communication | 2018 |
| Datoo Properties Limited | Real estate | 2020 |
| Datum Build and Construction Limited | Construction | 2021 |
| Datum Services Ltd | Construction | 2023 |
| Dave & Gina Limited | Real estate | 2025 |
| Dave O'Connor Decorating Limited | Construction | 2015 |
| Dave Property Investments Ltd | Real estate | 2018 |
| Davenport PR Limited | Information & communication | 2014 |
| David Ashley Consultancy Limited | Information & communication | 2019 |
| David Blakey Services Limited | Construction | 1999 |
| David Crooks Software Development Limited | Information & communication | 2017 |
| David Deyong (Wholesale) Limited | Wholesale & retail | 2012 |
| David Edward Jones Limited | Information & communication | 2019 |
| David Gold Limited | Arts & recreation | 2019 |
| David Olivia Consulting Ltd | Hospitality | 2018 |
| Davidali Logistics Ltd | Transport & logistics | 2016 |
| Davik Builders Limited | Construction | 1986 |
| Davinic Limited | Information & communication | 2011 |
| Davisoft Freight Limited | Transport & logistics | 2017 |
| Davjunnel Solicitors Limited | Professional & scientific | 2015 |
| Dawit Support Services Ltd | Administrative & support | 2025 |
| Dawn Echo Limited | Information & communication | 2023 |
| Dawn White Limited | Professional & scientific | 2026 |
| Daxarad Limited | Health & social care | 2023 |
| Day Moon Limited | Information & communication | 2025 |
| Daylight Sunlight Consulting Ltd | Administrative & support | 2020 |
| Daymount Limited | Wholesale & retail | 1994 |
| Daypubs Ltd | Hospitality | 2026 |
| Daytoday Convenience Stores Limited | Wholesale & retail | 2021 |
| Dazzle Days Limited | Health & social care | 2024 |
| DB Actuarial Consulting Ltd | Financial services | 2017 |
| Db&Bi Services Ltd | Information & communication | 2013 |
| Dbattersby Holdings Ltd | Financial services | 2025 |
| Dbattersby Properties Ltd | Real estate | 2025 |
| Dbeatz Evolution Limited | Manufacturing | 2025 |
| DBL Crypto Limited | Construction | 2022 |
| Dbmaks Limited | Professional & scientific | 2023 |
| Dbmn Consultants Limited | Professional & scientific | 2014 |
| DBP Law Limited | Professional & scientific | 2008 |
| DBS Controls Limited | Construction | 2015 |
| DBS Engineering Ltd | Construction | 2013 |
| DBS Group Holdings Limited | Administrative & support | 2011 |
| DBS Mechanical & Electrical Ltd | Energy | 2013 |
| DBS Pro Construct Ltd | Construction | 2018 |
| DC Care Services Ltd | Other services | 2017 |
| Dcain Engineering Ltd | Professional & scientific | 2019 |
| DCC Legal Services Limited | Information & communication | 2015 |
| DCC2023 Limited | Manufacturing | 2004 |
| DCG Associates Limited | Professional & scientific | 2026 |
| DCH Engineering Ltd | Construction | 2017 |
| DCM Clothing Limited | Wholesale & retail | 2018 |
| DCM Hollington Trust | Professional & scientific | 1930 |
| Dcmens UK Limited | Wholesale & retail | 2014 |
| DCN Ltd | Transport & logistics | 2016 |
| DCR Refurbishing Limited | Construction | 2024 |
| DCR Tiling&Stone Limited | Construction | 2017 |
| DCS Universal Contractors Ltd | Manufacturing | 2018 |
| DCU Holdings Ltd | Financial services | 2026 |
| DD Gaming Limited | Information & communication | 2025 |
| DDO Properties Ltd | Real estate | 2016 |
| DDP Solutions Limited | Real estate | 2015 |
| DDP TEK Solutions Limited | Information & communication | 2025 |
| Ddpt Holdings Limited | Financial services | 2025 |
| Ddpt Limited | Real estate | 2025 |
| DDS Legal Services Limited | Professional & scientific | 2019 |
| DE Barr Healthcare Limited | Health & social care | 2023 |
| DE Bellefroid Ltd | Professional & scientific | 2025 |
| DE Consulting Limited | Real estate | 2022 |
| DE Franca Gardening Ltd | Administrative & support | 2026 |
| DE Freitas Property Management Ltd | Real estate | 2026 |
| DE Havilland Place (Hatfield) Limited | Households | 2013 |
| DE Lage Landen Leasing Limited | Financial services | 1989 |
| DE Lage Landen Limited | Professional & scientific | 1992 |
| DE Maria Developments Ltd | Real estate | 2023 |
| DE Montfort Hair Clinic Limited | Other services | 2016 |
| DE Robertis Limited | Health & social care | 2017 |
| DE Vere Procurement Limited | Professional & scientific | 2003 |
| Deadline Cutting Limited | Manufacturing | 2003 |
| Deal 2 Deal Removal Limited | Transport & logistics | 2018 |