| D. Marsden Limited | Real estate | 2022 |
| D.A Professional Services Ltd | Other services | 2018 |
| D.A.B Developments Ltd | Construction | 2025 |
| D.D. Goody Limited | Wholesale & retail | 1984 |
| D.J.A Surfacing Limited | Construction | 2019 |
| D.R.F Investments Ltd | Financial services | 2025 |
| D3 Corporation Ltd | Manufacturing | 2012 |
| D3GOV Limited | Professional & scientific | 2011 |
| D4 Global Ltd | Construction | 2023 |
| DA Floorheating and Screed Ltd | Construction | 2025 |
| DA Vinci Investigations Limited | Administrative & support | 2014 |
| Daag's Courier Services Ltd | Transport & logistics | 2025 |
| Daamer Ltd | Administrative & support | 2025 |
| Daap Mitchell Facility Ltd | Information & communication | 2025 |
| Daap Technology Ltd | Information & communication | 2025 |
| DAB Floor Care Limited | Construction | 2025 |
| Dabbawala 'Indian Meals on Wheels' Ltd | Hospitality | 2017 |
| Daemann Ltd | Information & communication | 2021 |
| Dafa-Mijono Limited | Health & social care | 2022 |
| Dafalla Limited | Health & social care | 2014 |
| Dafalla Properties Limited | Real estate | 2022 |
| Daggerlux Limited | Professional & scientific | 2000 |
| Dags Logs Ltd | Wholesale & retail | 2022 |
| Dags Services Ltd | Agriculture & fishing | 2016 |
| Daily Delight & Dessert Bar Ltd | Hospitality | 2022 |
| Dainty & Grace Co. Limited | Professional & scientific | 2025 |
| Daisy Realty Ltd | Real estate | 2024 |
| Daisy Valentine Ltd | Arts & recreation | 2023 |
| Daisyhill Housing Limited | Real estate | 2026 |
| Dala Property Ltd | Households | 2018 |
| Dale Bakery Limited | Extraterritorial | 2022 |
| Dale House School Limited | Education | 1999 |
| Dale Inn Developments Limited | Construction | 2021 |
| Dales of Yorkshire Limited | Wholesale & retail | 2011 |
| Dalmeny Care Services Ltd | Health & social care | 2025 |
| Dalton Food Store Ltd | Wholesale & retail | 2025 |
| Dalton Medical Limited | Real estate | 2024 |
| Dalton Together CIC | Other services | 2026 |
| DAM Investments and Properties Limited | Other services | 2010 |
| DAM Polymers Limited | Extraterritorial | 2011 |
| Damarni Shakeil Ltd | Wholesale & retail | 2024 |
| Damered Limited | Financial services | 2016 |
| Damnbusters Limited | Real estate | 2025 |
| Damon’S Maintenance & Repair Ltd | Construction | 2021 |
| Damp 2 DRY Solutions (Yorkshire) Ltd | Construction | 2019 |
| Damselfly Ltd | Administrative & support | 2020 |
| Damson & Green Properties Ltd | Wholesale & retail | 2008 |
| Dancat Ltd | Real estate | 2025 |
| Dance Quantum Intelligent Technology Co Ltd | Wholesale & retail | 2021 |
| Dandelion Harbour Group Ltd | Financial services | 2023 |
| Dandy Hub Ltd | Extraterritorial | 2024 |
| Daniel Lloyd Racing.Com LLP | | 2011 |
| Daniel Ponting Consultancy Limited | Administrative & support | 2025 |
| Danielle Crowther Ltd | Professional & scientific | 2012 |
| Danielle Jones Editing Limited | Information & communication | 2013 |
| Danielleboxall Ltd | Professional & scientific | 2016 |
| Danjr Ltd | Transport & logistics | 2024 |
| Dank Duality Ltd | Manufacturing | 2025 |
| Danlett Holdings Limited | Financial services | 2007 |
| Danology Ltd | Wholesale & retail | 2022 |
| Dansco Developments Ltd | Construction | 2025 |
| Dany Travels Ltd | Transport & logistics | 2026 |
| Dapur at Home Ltd | Hospitality | 2020 |
| Dapur Malaysia Limited | Hospitality | 2015 |
| Dare Boutique Fashion Ltd | Wholesale & retail | 2024 |
| Dare Boutique Ltd | Wholesale & retail | 2016 |
| DARE2WEAR Limited | Wholesale & retail | 2026 |
| Darella Properties Limited | Real estate | 2021 |
| Dari Auto H Limited | Wholesale & retail | 2023 |
| Dark Horse Theatre | Arts & recreation | 2000 |
| Dark Treasures Ltd | Other services | 2018 |
| Dark Woods Coffee Ltd | Manufacturing | 2013 |
| Darkel Construction Ltd | Construction | 2020 |
| Daropeant Properties Limited | Real estate | 1987 |
| Darryl Townend Limited | Construction | 2016 |
| Dash Water Limited | Professional & scientific | 2024 |
| Data Sciences Consulting Limited | Information & communication | 2021 |
| Datalink Dynamics Ltd | Information & communication | 2025 |
| Datanet Cabling Services Limited | Information & communication | 2007 |
| Dataspace Publishing Ltd | Information & communication | 2023 |
| Dateless Registrations Ltd | Wholesale & retail | 2021 |
| David Broster Limited | Agriculture & fishing | 1987 |
| David Brown Gear Industries Limited | Manufacturing | 1993 |
| David Brown Santasalo UK (Industrial) Ltd | Manufacturing | 2008 |
| David Brown Santasalo UK Limited | Manufacturing | 2008 |
| David Brown Systems India (Holdings) Limited | Professional & scientific | 2010 |
| David Carden Design Limited | Professional & scientific | 2014 |
| David Gaunt Properties Ltd | Real estate | 2022 |
| David Hallas Limited | Construction | 2008 |
| David Harrison & Sons Limited | Wholesale & retail | 1976 |
| David L. Hall Limited | Manufacturing | 2002 |
| David Million Associates Limited | Professional & scientific | 2012 |
| David N. Harling Ltd | Professional & scientific | 2011 |
| David Scott & Co (Pattern Makers) Limited | Manufacturing | 1970 |
| David W Dyson (Firearms Consultants) Ltd | Other services | 2008 |
| Davray Ltd. | Construction | 2008 |
| Dawang Foods Ltd | Hospitality | 2025 |
| Dawatech Limited | Wholesale & retail | 2020 |
| Dawson and Hall Limited | Wholesale & retail | 1991 |
| Dawson Sweeting Limited | Financial services | 2015 |