| Day One Routine Ltd | Wholesale & retail | 2026 |
| Day Star Care C.I.C. | Professional & scientific | 2015 |
| Day to Day Cleaners Ltd | Administrative & support | 2022 |
| Day&Night Solutions Ltd | Administrative & support | 2021 |
| DAY2DAY Birmingham Roofing Ltd | Construction | 2025 |
| DAY2DAY Couriers Ltd | Transport & logistics | 2015 |
| DAY2DAY Logistics Limited | Transport & logistics | 2022 |
| DAY2DAY Mobiles Limited | Wholesale & retail | 2018 |
| Daya Healthcare Group Limited | Administrative & support | 2022 |
| Daya Kaur Recruitment Limited | Administrative & support | 2024 |
| Daya Property Investment LLP | | 2026 |
| Daya Property Ltd | Real estate | 2018 |
| Daya Surgery Ltd | Extraterritorial | 2013 |
| Dayco Maintenance Limited | Construction | 1993 |
| Daydream DEN Ltd | Real estate | 2025 |
| Daydream Trans Ltd | Transport & logistics | 2018 |
| Dayfor Limited | Real estate | 1999 |
| Dayfos Limited | Construction | 2014 |
| Dayfos Properties Limited | Real estate | 2018 |
| Dayjob Limited | Information & communication | 2004 |
| Daylight Solar Energies Ltd. | Information & communication | 2025 |
| Daynight Services Limited | Transport & logistics | 2025 |
| Dayta Academy Ltd | Wholesale & retail | 2021 |
| Dayton Developments Limited | Construction | 2022 |
| Dayu Motors Ltd | Wholesale & retail | 2018 |
| Daywalker Enterprise Ltd | Real estate | 2025 |
| Dayyara Housing Limited | Real estate | 2024 |
| DAZ Commercial Estates Ltd | Construction | 2016 |
| Dazzle & Shine Ltd | Administrative & support | 2026 |
| Dazzling Dreams GB | Other services | 2004 |
| Dazzling Nails,Hair & Beauty Limited | Other services | 2025 |
| DB AK Developments Limited | Information & communication | 2020 |
| DB AK Holdings Ltd | Administrative & support | 2025 |
| DB AK Properties Ltd | Real estate | 2025 |
| DB Atelier Limited | Construction | 2020 |
| DB Chippy Limited | Construction | 2018 |
| DB Dental Group Limited | Health & social care | 2017 |
| DB Energy Solutions Ltd | Construction | 2023 |
| DB Events Limited | Wholesale & retail | 2024 |
| DB Facilities Management Limited | Households | 2024 |
| DB Grab Hire Limited | Water & waste | 2016 |
| DB in Law Limited | Professional & scientific | 2021 |
| DB Insulation Services Ltd | Construction | 2019 |
| DB MAC3 Ltd | Construction | 2025 |
| Dbac Ltd | Information & communication | 2023 |
| Dbat Limited | Transport & logistics | 2020 |
| DBB Groundworks Ltd | Hospitality | 2012 |
| DBB Investments Ltd | Real estate | 2024 |
| Dbcw Limited | Professional & scientific | 2022 |
| DBE Associates Limited | Professional & scientific | 2025 |
| DBH FBA Ltd | Wholesale & retail | 2022 |
| DBI Investments Ltd | Financial services | 2020 |
| DBJ Properties Ltd | Real estate | 2020 |
| DBK Associates Limited | Manufacturing | 2017 |
| DBK Fitters Ltd | Construction | 2022 |
| DBK Property Holdings Limited | Real estate | 2026 |
| DBK Trade Support Ltd | Professional & scientific | 2026 |
| Dbonairr Limited | Wholesale & retail | 2020 |
| DBS Alpha Ltd | Real estate | 2025 |
| DBS at the Robin Hood Inn Ltd | Hospitality | 2022 |
| DBS Contractors Ltd | Construction | 2025 |
| DBS Jewellery Ltd | Wholesale & retail | 2019 |
| DBS Properties (WM) Ltd | Real estate | 2022 |
| Dbsuk Group Limited | Real estate | 1999 |
| Dbsuk Holding Limited | Professional & scientific | 2023 |
| DBT Supplies Ltd | Other services | 2022 |
| Dbtm U.K. Limited | Professional & scientific | 2017 |
| DC Auto Trading Ltd | Wholesale & retail | 2025 |
| DC Construction (Midlands) Limited | Construction | 2012 |
| DC Decorators Limited | Construction | 2021 |
| DC Dental Care Limited | Health & social care | 2025 |
| DC Derbyshire Limited | Hospitality | 2025 |
| DC Electric Car Parts Ltd | Wholesale & retail | 2020 |
| DC Events Group Ltd | Hospitality | 2025 |
| DC Film & Animation Ltd | Information & communication | 2025 |
| DC Food Factory Limited | Hospitality | 2025 |
| DC Foods Ltd | Hospitality | 2007 |
| DC Foods Madeley Limited | Hospitality | 2016 |
| DC Houses Limited | Real estate | 2019 |
| DC Housing Limited | Real estate | 2015 |
| DC Investment Holdings Limited | Financial services | 2022 |
| DC Jewellers Ltd. | Wholesale & retail | 2018 |
| DC Lion International Limited | Transport & logistics | 2026 |
| DC Optom Limited | Health & social care | 2004 |
| DC Revival Ltd | Professional & scientific | 2024 |
| DC Security Services Ltd | Administrative & support | 2021 |
| DC Store Ltd | Wholesale & retail | 2024 |
| DC Studioz Ltd | Other services | 2023 |
| DC Tour Ltd | Hospitality | 2024 |
| DC Wholesale Ltd | Wholesale & retail | 2024 |
| DCA Consultancy Group Ltd | Financial services | 2026 |
| DCA Consultancy Limited | Professional & scientific | 1996 |
| DCC Long Haul Ltd | Wholesale & retail | 2020 |
| Dccl AI Ltd | Other services | 2023 |
| DCD Advertising Limited | Professional & scientific | 2010 |
| Dcfc Crewe Limited | Hospitality | 2026 |
| DCH Contractors Limited | Construction | 2025 |
| DCH Logistics Group Ltd | Transport & logistics | 2024 |
| DCH Motors Limited | Wholesale & retail | 2024 |
| DCI Electrical (Birmingham) Limited | | 2013 |