| Cynergy Security Group Limited | Administrative & support | 2018 |
| Cynergy Security Ltd | Professional & scientific | 2010 |
| Cynergy Training Solutions Ltd | Administrative & support | 2022 |
| Cynwyd Enterprises Limited | Wholesale & retail | 2017 |
| D & K Landscape Services Limited | Administrative & support | 2003 |
| D & L Mccall Ltd | Real estate | 2022 |
| D & L Morris (UK) Limited | Construction | 2023 |
| D & R Property Limited | Real estate | 2023 |
| D & S Harris Homes Limited | Construction | 2003 |
| D a Cotton & SON Limited | Manufacturing | 2005 |
| D a Jelley Instrumentation Ltd | Professional & scientific | 2024 |
| D Andrews Building Limited | Construction | 2023 |
| D F Christmas Limited | Professional & scientific | 2016 |
| D John Property Development Limited | Real estate | 2021 |
| D M I 4 Change Ltd | Professional & scientific | 2024 |
| D Machin Ltd | Health & social care | 2014 |
| D P Architects (North West) Limited | Professional & scientific | 2010 |
| D&G Jewsbury Ltd | Construction | 2025 |
| D&W Ventures Limited | Wholesale & retail | 2026 |
| D. & E. Motor Accessories (Widnes) Limited | Administrative & support | 1976 |
| D.B. Pension Guidance Limited | Financial services | 2019 |
| D.G. Chester Limited Liability Partnership | | 2002 |
| D.H. Siddons Limited | Manufacturing | 2019 |
| D.P. Pearson Limited | Professional & scientific | 2006 |
| D2 Architects Ltd | Professional & scientific | 2013 |
| D3 I.T Consultants Limited | Information & communication | 2015 |
| D5 International Consultancy Limited | Professional & scientific | 2023 |
| D5 International Holdings Limited | Financial services | 2023 |
| D5 International Real Estate Limited | Professional & scientific | 2023 |
| D5 International Yachting Limited | Professional & scientific | 2023 |
| D5 Yachting Limited | Administrative & support | 2012 |
| DAB Painting and Decorating Services Ltd | Construction | 2025 |
| Daborn Property Ltd | Other services | 2024 |
| Dada Design & Print Limited | Manufacturing | 2003 |
| Daek Health Ltd | Health & social care | 2024 |
| Daisy Chain Nursery Bebington Ltd | Health & social care | 2013 |
| Daisy Chain Nursery Walton Limited | Education | 2005 |
| Daisy Consulting Solutions Limited | Administrative & support | 2022 |
| Daisy Joy Escapes Limited | Real estate | 2024 |
| Daisy Joy Investments Limited | Real estate | 2021 |
| Daisy’S Dog Spa Ltd | Other services | 2024 |
| Daktela UK Limited | Information & communication | 2010 |
| Dale Estates Limited(The) | Real estate | 1917 |
| Dales Engineered Solutions (DES) Ltd | Professional & scientific | 2024 |
| Daleside Animal Care Ltd | Professional & scientific | 2010 |
| Daley Brothers Ltd. | Administrative & support | 2024 |
| Dalyan Consultants Limited | Real estate | 2008 |
| Damian Mctaggart Design Limited | Information & communication | 2004 |
| Danan Capital Limited | Professional & scientific | 2023 |
| Danan Care Limited | Professional & scientific | 2023 |
| Danan Group Limited | Financial services | 2023 |
| Danan Properties (Abergele) Limited | Construction | 2026 |
| Danan Properties (Widnes) Limited | Construction | 2026 |
| Danda Limited | Professional & scientific | 2012 |
| Dandy Homes Ltd | Real estate | 2016 |
| Dandy's (Chester) Limited | Wholesale & retail | 2004 |
| Dandy's Plant Hire Limited | Administrative & support | 2021 |
| Dandy's Properties Limited | Real estate | 2014 |
| Dandy's Self Storage Limited | Real estate | 2021 |
| Dandyn Ltd | Construction | 2023 |
| Dandys Topsoil Limited | Extraterritorial | 2020 |
| Daniel MIS Property Limited | Real estate | 2024 |
| Danso Promotions Limited | Arts & recreation | 2019 |
| Daoco Ltd | Financial services | 2019 |
| DAP Operations Ltd | Information & communication | 2019 |
| Darby Close (Nesscliffe) Management Company Limited | Households | 2022 |
| Darlands Court Management Company Limited | Real estate | 2014 |
| Darya Global Business Ltd | Wholesale & retail | 2019 |
| Dash Acquistions Ltd | Real estate | 2025 |
| Data Quality Ltd | Information & communication | 2021 |
| Data Sphere Solutions Ltd | Information & communication | 2023 |
| Data Strategies Consulting Limited | Information & communication | 2014 |
| Dataframe Solutions Limited | Information & communication | 2020 |
| Datascope Systems Limited | Information & communication | 2011 |
| Datascope Topco Limited | Financial services | 2024 |
| Datawoj Ltd | Information & communication | 2016 |
| Datnow Limited | Health & social care | 1966 |
| Daulby Read Limited | Financial services | 2007 |
| Davcal Properties Ltd | Real estate | 2020 |
| Dave Rolt Management Ltd | Professional & scientific | 2020 |
| Dave Williams Photography Limited | Professional & scientific | 2003 |
| Dave's Tyres and Garage Limited | Wholesale & retail | 2026 |
| Davenparty Limited | Hospitality | 2025 |
| Davenport Catering Ltd | Hospitality | 2024 |
| Davenport Greenshields Trustee NO.1 Limited | Real estate | 2026 |
| Davenport Greenshields Trustee NO.2 Limited | Real estate | 2026 |
| Davey Consultancy Limited | Professional & scientific | 2019 |
| David Bingle Associates Limited | Information & communication | 2018 |
| David Cliffe Geology Limited | Professional & scientific | 2009 |
| David J. England Limited | Information & communication | 2004 |
| David James Electrical Solutions Ltd | Construction | 2021 |
| David Joinson & Sons Ltd | Wholesale & retail | 2021 |
| David Joinson & Sons Quality Meats @ Bistre Shop Ltd | Wholesale & retail | 2025 |
| David Lloyd Flooring Limited | Construction | 2021 |
| David Marshall Properties Limited | Real estate | 2015 |
| David Rose Consultancy Limited | Administrative & support | 2015 |
| David S Jones Ltd | Households | 2020 |
| David Schubert Consulting Limited | Professional & scientific | 2024 |
| David Smith Neurology Limited | Health & social care | 2012 |
| David Thorp Limited | Administrative & support | 2007 |