| Cynnatech Ltd | Professional & scientific | 2016 |
| D & a Flooring Limited | Administrative & support | 2006 |
| D & a Riverside Limited | Hospitality | 1999 |
| D and B Properties Limited | Construction | 1989 |
| D H M Property Services Ltd | Real estate | 2024 |
| D J Haines Ltd | Wholesale & retail | 2020 |
| D J R Read Ltd | Professional & scientific | 2024 |
| D Jones Fabrications Limited | Manufacturing | 2008 |
| D M Mortgage Services Ltd | Financial services | 2012 |
| D Martin Investments Limited | Financial services | 2023 |
| D Mutlow Plumbing Ltd | Construction | 2023 |
| D P Home and Renovation Ltd | Construction | 2016 |
| D R Vowles & SON Limited | Construction | 2003 |
| D S Alarms Limited | Administrative & support | 2019 |
| D S Monitoring Limited | Administrative & support | 2010 |
| D Ventress Ltd | Professional & scientific | 2015 |
| D W Moore Transport Limited | Transport & logistics | 2011 |
| D W Smith Lettings Limited | Real estate | 2012 |
| D&A Roadside Retail Limited | Wholesale & retail | 2022 |
| D&G Luxury Rooms Ltd | Real estate | 2025 |
| D&M Adventures Limited | Wholesale & retail | 2016 |
| D-Heap Ltd | Information & communication | 2010 |
| D. J. Fatica Asset Management Ltd | Professional & scientific | 2017 |
| D2E Consulting Limited | Professional & scientific | 2012 |
| D3ST Limited | Professional & scientific | 2023 |
| DA Capo Italian Food & Beverage Ltd | Hospitality | 2020 |
| Daan Ltd | Administrative & support | 2025 |
| Dachshund Days Ltd | Other services | 2025 |
| DAF Delivery Ltd | Transport & logistics | 2020 |
| DAF Properties Limited | Real estate | 2004 |
| DAG Advisory Ltd | Professional & scientific | 2025 |
| Dahlia Gardens (Bath) Ltd | Households | 2017 |
| Dahlia Hospitality Ltd | Hospitality | 2026 |
| Daisy Rose Gardeners Limited | Administrative & support | 2011 |
| DAJ Removals and More Ltd | Water & waste | 2024 |
| Damb Properties Ltd | Real estate | 2025 |
| Dame Kelly Holmes Trust | Education | 2008 |
| Dancerace Bidco Limited | Financial services | 2024 |
| Dancerace PLC | Information & communication | 1992 |
| Dang Liquor Limited | Wholesale & retail | 2021 |
| Daniel Carvan Investments Limited | Professional & scientific | 2021 |
| Daniel Maxwell Ltd | Health & social care | 2007 |
| Daniel O'Connell Catering Limited | Health & social care | 2023 |
| Danielle Collins Ltd | Wholesale & retail | 2016 |
| Danithai Ltd | Hospitality | 2019 |
| Dannz Limited | Transport & logistics | 2023 |
| Darch & Partners Ltd | Other services | 2024 |
| Dard Consulting Limited | Information & communication | 2010 |
| Dark Union Limited | Professional & scientific | 2022 |
| Darkroom Digital Limited | Arts & recreation | 2006 |
| Darlaston Grange Development Ltd | Construction | 2026 |
| Dart Spring & Safe Co Limited | Manufacturing | 1994 |
| Dart Spring Holdings Limited | Professional & scientific | 1939 |
| Darwin & Wallace Limited | Hospitality | 2012 |
| Data Management Advisors Limited | Information & communication | 2015 |
| Datagold Ltd | Information & communication | 2021 |
| Dataline Express Couriers Limited | Transport & logistics | 2013 |
| Datameo Ltd | Information & communication | 2025 |
| Datareq Ltd | Administrative & support | 2024 |
| Datilda Ltd | Information & communication | 2017 |
| Daubeneys Limited | Hospitality | 2003 |
| Dave Attwood Consultancy Ltd | Professional & scientific | 2024 |
| Davenports Investments Limited | Real estate | 2019 |
| Davey Jones Designs Limited | Extraterritorial | 2012 |
| David Brady Ltd | Professional & scientific | 2015 |
| David Butler Photography Ltd | Professional & scientific | 2016 |
| David C Roberts Ltd | Financial services | 2013 |
| David Gardner Consulting Limited | Professional & scientific | 2014 |
| David Glass Ensemble UK Limited | Administrative & support | 2017 |
| David Horne IT Consulting Limited | Information & communication | 2017 |
| David IAN Richards Limited | Professional & scientific | 2020 |
| David Osborne Consulting Limited | Professional & scientific | 2024 |
| David P. Limited | Hospitality | 2024 |
| Davies & Co (Kettering) Limited | Manufacturing | 1988 |
| Davies Property and Shopfitting Services Limited | Construction | 2012 |
| Davion Cares Limited | Education | 2025 |
| Davos Consulting Group Limited | Professional & scientific | 2017 |
| Davvero UK Ltd | Wholesale & retail | 2025 |
| Dawco Ltd | Real estate | 1994 |
| Dawes & Duffee Ltd | Construction | 2012 |
| Day Associates Management Consultants Limited | Professional & scientific | 2007 |
| Dayan Consulting Ltd | Extraterritorial | 2022 |
| Dayes Limited | Wholesale & retail | 1999 |
| DB Nexus Group Limited | Wholesale & retail | 2026 |
| DBI Systems Ltd | Manufacturing | 1994 |
| Dbra Limited | Wholesale & retail | 1999 |
| Dbts Europe Limited | Wholesale & retail | 2013 |
| Dcactiv Ltd | Extraterritorial | 2010 |
| DCC Services (South West) Limited | Professional & scientific | 2024 |
| DCI Electrical & Building Services Ltd | Construction | 2009 |
| Dcop Limited | Other services | 2012 |
| DCR Property Management Ltd | Real estate | 2019 |
| DD Management Ltd | Administrative & support | 2014 |
| DDG Properties (WM) Limited | Professional & scientific | 2008 |
| DDG Properties Limited | Professional & scientific | 1999 |
| DDP Property Investments Limited | Real estate | 2022 |
| DE Europe Group Holding Ltd. | Financial services | 2018 |
| DE Montalt Life Sciences Ltd | Real estate | 2022 |
| DE Montalt Mill (Bath) Management Company Limited | Administrative & support | 2008 |
| DE Smit (Holdings) Ltd | Financial services | 2024 |