| Cyril Geen Ltd | Professional & scientific | 2020 |
| CZ China Chef Limited | Hospitality | 2020 |
| CZ. Atal Trans Ltd | Transport & logistics | 2016 |
| D & G Carpentry & Building Ltd | Administrative & support | 2017 |
| D & M Carpets & Flooring Ltd | Construction | 2023 |
| D & M QS Consultancy Limited | Professional & scientific | 2013 |
| D & S Macfire Holdings Ltd | Professional & scientific | 2010 |
| D and G Hairdressing Limited | Other services | 2015 |
| D B Blocks Ltd. | Construction | 2004 |
| D Beament Ltd | Construction | 2025 |
| D Bowden Homes Ltd | Real estate | 2025 |
| D Brown Brickwork Ltd | Construction | 2024 |
| D C Aggregates Limited | Wholesale & retail | 2008 |
| D C Golden Scissors Ltd | Other services | 2018 |
| D C Parks Limited | Information & communication | 2013 |
| D C Plant Hire Limited | Administrative & support | 2023 |
| D C Solicitors Limited Liability Partnership | | 2008 |
| D F Coatings Ltd. | Administrative & support | 2011 |
| D F Roofing South Ltd | Construction | 2025 |
| D G Atom Ltd | Transport & logistics | 2019 |
| D G Pharma Limited | Wholesale & retail | 2018 |
| D G Taylor Football Programmes Limited | Wholesale & retail | 2010 |
| D H Containers Limited | Transport & logistics | 2014 |
| D J K Spraying Limited | Construction | 2025 |
| D J Learning and Skills Associate Ltd | Education | 2024 |
| D J Scott Garden Machinery Limited | Wholesale & retail | 2000 |
| D J Willrich EXP Limited | Professional & scientific | 1986 |
| D Jones Plumbing and Heating Limited | Construction | 2014 |
| D L Harris Windows Ltd | Administrative & support | 2017 |
| D L Property Renovation & Maintenance Ltd | Construction | 2024 |
| D L Taylor Limited | Construction | 2002 |
| D Lang Holdings UK Limited | Financial services | 2026 |
| D Macgregor & Company Limited | Construction | 2003 |
| D Mishra Ltd | Wholesale & retail | 2022 |
| D N Russell Limited | Construction | 2025 |
| D P S Solutions Limited | Construction | 2003 |
| D R B Performance Ltd | Wholesale & retail | 2023 |
| D R Groundworks Ltd | Construction | 2004 |
| D Ratcliffe & Sons Ltd | Construction | 2019 |
| D Rathor Holdings Ltd | Financial services | 2022 |
| D Tyler Flooring Ltd | Construction | 2021 |
| D W First Solutions Limited | Information & communication | 2018 |
| D White Builders Limited | Construction | 2007 |
| D&B Plastering Services & Contractors Ltd | Construction | 2015 |
| D&C Car Hire Limited | Administrative & support | 2018 |
| D&D Brightclean Ltd | Administrative & support | 2026 |
| D&D Fire Protection Ltd | Construction | 2025 |
| D&D Home Improvements Ltd | Construction | 2025 |
| D&J Consultancy Limited | Health & social care | 2022 |
| D&J Remarc Ltd | Real estate | 2026 |
| D&M Bites&Bottles Limited | Wholesale & retail | 2025 |
| D&M Direct 2 YOU Ltd | Professional & scientific | 2023 |
| D&M Water Lily Cleaning Specialist Ltd | Wholesale & retail | 2025 |
| D&N Spring Clean’Z Ltd | Administrative & support | 2024 |
| D&N Tiling Ltd | Construction | 2015 |
| D&S Maintenance Limited | Construction | 2015 |
| D&Sk Limited | Real estate | 2025 |
| D&T Vehicle Solution Ltd | Wholesale & retail | 2025 |
| D,Cent Cutz Ltd | Other services | 2017 |
| D-Dry Lining & Refurbishment Ltd | Construction | 2021 |
| D-Max Construction Ltd | Construction | 2016 |
| D. & R. Structures Limited | Construction | 1991 |
| D.A.D Automotive Limited | Wholesale & retail | 2025 |
| D.A.P Automotive Ltd | Wholesale & retail | 2023 |
| D.And F.Estates Limited | Real estate | 1933 |
| D.Andrew (UK) Properties Ltd | Real estate | 2024 |
| D.Benbow Estates Ltd | Real estate | 2023 |
| D.E.H. Designs Limited | Administrative & support | 1971 |
| D.E.S.S. Limited | Manufacturing | 2003 |
| D.G. Construction (Southampton) Limited | Construction | 2008 |
| D.H. Game Limited | Agriculture & fishing | 2005 |
| D.N.Y. Limited | Financial services | 2012 |
| D.P.P. EBT Limited | Professional & scientific | 2020 |
| D.W.G.Estates Limited | Real estate | 1933 |
| D2 Engineering Services Ltd | Professional & scientific | 2020 |
| D2M Solutions Limited | Energy | 2002 |
| D4Y Limited | Wholesale & retail | 2022 |
| D7 Marine Ltd | Manufacturing | 2016 |
| DA Burger Limited | Hospitality | 2019 |
| DA Groundworks & Construction Ltd | Construction | 2021 |
| DA Property (South Coast) Limited | Real estate | 2020 |
| DA Silva Construction Ltd | Construction | 2021 |
| Da'M Defend Limited | Other services | 2025 |
| Daban Food Ltd | Hospitality | 2023 |
| DAC Energy Ltd | Administrative & support | 2020 |
| DAC Energy Solutions Limited | Professional & scientific | 2017 |
| Daco Properties Investments Ltd | Real estate | 2025 |
| Daco Refurbishment Plumbing and Heating Ltd | Construction | 2022 |
| Dacul Trans Ltd | Transport & logistics | 2015 |
| Dacuriositycorner Ltd | Wholesale & retail | 2025 |
| Dada Dada Limited | Other services | 2017 |
| Daducouriers Express Limited | Transport & logistics | 2024 |
| Daedalus Drylining & Plastering Ltd | Construction | 2020 |
| Daeir Legacy Logistics Group Ltd | Transport & logistics | 2022 |
| Daeliasecurity&Cleaning Limited | Administrative & support | 2022 |
| Daemon Engine Limited | Information & communication | 2025 |
| Dagina Limited | Professional & scientific | 2012 |
| Dahlia Couture Ltd | Wholesale & retail | 2024 |
| Daily Bounce Active Ltd | Manufacturing | 2026 |
| Daily Comfort Healthcare Ltd. | Health & social care | 2017 |