| Day-Night HR Ltd | Administrative & support | 2016 |
| Day-Night Pharma MM Ltd | Health & social care | 2015 |
| Day-Night Pharma Oak Ltd | Health & social care | 2015 |
| Day-Night Pharma WSN Ltd | Health & social care | 2015 |
| Day-Night Properties Ltd | Real estate | 2014 |
| DAY32 Ltd | Information & communication | 2014 |
| Daya’S Kitchen Ltd | Hospitality | 2025 |
| Daybrook Bowls Club Limited | Arts & recreation | 2025 |
| Daybrook Building Services Limited | Construction | 2016 |
| Daybrook Convenience Ltd | Wholesale & retail | 2023 |
| Daybrook Electrical Limited | Manufacturing | 2001 |
| Daybrook Services Limited | Administrative & support | 2007 |
| Dayclear Lighting Online Ltd | Wholesale & retail | 2020 |
| Daykin Services Ltd | Administrative & support | 2026 |
| Daylight Projects UK Limited | Professional & scientific | 2017 |
| Daynight Eyecare Ltd | Wholesale & retail | 2015 |
| Dayprint Ltd | Manufacturing | 2026 |
| Dayscape Limited | Real estate | 2002 |
| Daytona Blue LLP | | 2014 |
| Daytona Legal Limited | Administrative & support | 2022 |
| Daytona Travel Ltd | Transport & logistics | 2021 |
| Dayus Limited | Wholesale & retail | 1974 |
| DAZ Dreams Limited | Health & social care | 2025 |
| Dazzle Valeting Ltd | Other services | 2025 |
| Dazzsuperconstruct Ltd | Construction | 2025 |
| DB Capitol Limited | Real estate | 2019 |
| DB Clothing Ltd | Wholesale & retail | 2025 |
| DB Commercial Lettings Ltd | Real estate | 2025 |
| DB Express Ltd | Transport & logistics | 2015 |
| DB Fire Risk Assessments Ltd | Administrative & support | 2022 |
| DB Holdings (U.K.) Limited | Financial services | 2025 |
| DB Legacy Holdings Ltd | Real estate | 2025 |
| DB Plumbing & Property Services Limited | Construction | 2011 |
| DB Stewhouse Limited | Hospitality | 2025 |
| DB1 Holdings Limited | Extraterritorial | 2022 |
| DBA2022 Ltd | Professional & scientific | 2022 |
| Dbest Driving School Ltd | Education | 2025 |
| DBF Driver Services Limited | Transport & logistics | 2021 |
| Dbgb Ltd | Professional & scientific | 2022 |
| DBH Civils Limited | Construction | 2025 |
| Dblr Properties Limited | Real estate | 2025 |
| DBM Vircon Services (UK) Limited | Professional & scientific | 2007 |
| DBN Web Design Limited | Information & communication | 2008 |
| Dbnk Consultants Limited | Professional & scientific | 2011 |
| DBS (Nottm) Ltd | Wholesale & retail | 2026 |
| Dbsr Property Limited | Real estate | 2022 |
| DBU Properties Ltd | Real estate | 2018 |
| DBY Care & Services Ltd | Health & social care | 2025 |
| Dbzxconstructions Ltd | Construction | 2026 |
| DC Active Limited | Administrative & support | 2011 |
| DC Agencies Apparel Ltd | Wholesale & retail | 2015 |
| DC Cleaning Limited | Administrative & support | 2023 |
| DC Construction (Derby) Ltd | Construction | 2015 |
| DC Joinery Innovations Ltd | Construction | 2023 |
| DC Motorcycles Limited | Wholesale & retail | 2005 |
| DC OT Services Ltd | Health & social care | 2022 |
| DC Premium Roofing Ltd | Construction | 2018 |
| DC Print & Packaging Ltd | Manufacturing | 2020 |
| DC Sports DOC Ltd | Health & social care | 2019 |
| DC Training Ltd | Administrative & support | 2010 |
| DC Ventures Ltd | Wholesale & retail | 2019 |
| Dc-Oc Property Limited | Real estate | 2020 |
| Dc/Ac Electrical Ltd | Construction | 2024 |
| Dc/Ac Property & Investments Ltd | Real estate | 2025 |
| DC10 Accommodation Ltd | Real estate | 2025 |
| DC7 Contracting Services Ltd | Real estate | 2019 |
| DC9 Developments Ltd | Real estate | 2019 |
| DCA Consulting Limited | Financial services | 2021 |
| DCB (Kent) Limited | Construction | 1998 |
| DCD Plastic Ltd | Water & waste | 2022 |
| DCD Property Investments Limited | Real estate | 2023 |
| DCF Electrical (Nottingham) Ltd | Manufacturing | 2014 |
| DCH Group Holdings Limited | Financial services | 2024 |
| DCH Property Ltd | Real estate | 2024 |
| DCH Reporting Ltd | Health & social care | 2014 |
| Dcic Limited | Health & social care | 2012 |
| DCK Care Ltd | Health & social care | 2017 |
| Dclc Limited | Hospitality | 2022 |
| DCM Building Ltd | Construction | 2015 |
| DCM Electrical & Security Services Limited | Construction | 2025 |
| DCM Healthcare Limited | Health & social care | 2017 |
| Dcmq Ltd | Wholesale & retail | 2019 |
| Dcns (Premisenet) Limited | Information & communication | 2020 |
| DCP Drums Limited | Education | 2019 |
| DCS Investments Limited | Extraterritorial | 1996 |
| DCS Roofing Services Limited | Construction | 2017 |
| DCS Solutions Ltd | Transport & logistics | 2020 |
| DCW Recovery Ltd | Transport & logistics | 2025 |
| Dcwc Property Ltd | Real estate | 2026 |
| DD Joinery Ltd | Construction | 2025 |
| DD Marshall Properties Limited | Real estate | 2019 |
| DD Mellors Electrical Limited | Construction | 2003 |
| DD Residential Limited | Real estate | 2025 |
| DD Surveying Services Ltd | Professional & scientific | 2024 |
| DDA Investments Ltd | Real estate | 2019 |
| DDC Dent Care Ltd | Health & social care | 2022 |
| DDC Entertainment Ltd | Arts & recreation | 2009 |
| DDC Investments Ltd | Real estate | 2014 |
| DDC Portfolio Limited | Financial services | 2024 |
| DDC Precision Limited | Professional & scientific | 1988 |