| DA Wali Ltd | Hospitality | 2021 |
| Da'Mos Management Ltd | Wholesale & retail | 2015 |
| Daar ALI Ltd | Real estate | 2023 |
| Dabiici Movement CIC | Other services | 2025 |
| Dabs Foods Limited | Hospitality | 2019 |
| Daceta Consulting Ltd | Professional & scientific | 2009 |
| Dacp Services Ltd | Real estate | 2008 |
| Dadie Ltd | Health & social care | 2019 |
| Dadyal Halal Meat Ltd | Wholesale & retail | 2020 |
| Dagala Group Ltd | Professional & scientific | 2017 |
| Daily Shop Limited | Wholesale & retail | 2017 |
| Dair House School Trust Limited | Education | 1976 |
| Dais Comms Ltd | Professional & scientific | 2024 |
| Dais Labs Ltd | Professional & scientific | 2025 |
| Daisy Construction Ltd | Construction | 2019 |
| DAISY32 Ltd | Real estate | 2025 |
| Daivik London Ltd | Real estate | 2022 |
| DAK Fabrications Ltd | Manufacturing | 2023 |
| Dakin Brothers Limited | Professional & scientific | 1907 |
| Daksh Kitchen & Bedroom Ltd | Manufacturing | 2023 |
| DAL and Co Developments Ltd | Construction | 2022 |
| Dalal Healthcare Ltd | Health & social care | 2022 |
| Dalectrics Ltd | Construction | 2024 |
| Dalehurst Investments Ltd | Real estate | 2022 |
| Daleside GX Group Limited | Other services | 2021 |
| Daleside GX Limited | Real estate | 2019 |
| Daleside Property Ltd | Real estate | 2024 |
| Dalgety Bay Care Home Limited | Health & social care | 2020 |
| Dallo Associates Ltd | Transport & logistics | 2017 |
| Dalton Green Limited | Professional & scientific | 2025 |
| Dalwinder Singh Haulage Ltd | Construction | 2017 |
| Damal Village Ltd | Hospitality | 2025 |
| Damas Cafe Ltd | Hospitality | 2024 |
| Damasiotis Limited | Health & social care | 2006 |
| Damp-Tech-Uk Ltd | Construction | 2023 |
| DAN Horton Plumbing and Heating Limited | Construction | 2024 |
| DAN Jerrard Creative Limited | Professional & scientific | 2017 |
| DAN Walters Limited | Other services | 2010 |
| Dana Cleaning Services Limited | Extraterritorial | 2014 |
| Danesfield House Ltd | Real estate | 2024 |
| Daniel & Sons Services Limited | Wholesale & retail | 2025 |
| Daniel Family Homes (Property Investments) Limited | Real estate | 2006 |
| Daniel Family Homes Limited | Real estate | 2005 |
| Daniel Family Homes Planning Consultants Limited | Professional & scientific | 2010 |
| Daniel Slawomir Sulkowski Limited | Professional & scientific | 2026 |
| Daniel’S Construction Services Ltd | Construction | 2015 |
| Danisch Limited | Wholesale & retail | 2019 |
| Daniya Kayani Marketing Services Limited | Professional & scientific | 2020 |
| Danjang Healthcare Limited | Health & social care | 2023 |
| Danna Pani (Slough) Limited | Hospitality | 2023 |
| Danrosé Maintenance Ltd | Manufacturing | 2020 |
| Danube Plumbing & Electrical Solutions Limited | Construction | 2021 |
| Danuj Green Enterprise Ltd | Transport & logistics | 2024 |
| Danvictor Limited | Health & social care | 2019 |
| DANYREPAIR91 Limited | Construction | 2025 |
| Daph's Beauty Salon Ltd | Other services | 2024 |
| Dapps Technologies Ltd | Information & communication | 2018 |
| DAQ Driving School Ltd | Education | 2025 |
| DAR Alfarah Arabic School Limited | Education | 2018 |
| DAR Contractors Ltd | Construction | 2025 |
| DAR Trade Ltd | Wholesale & retail | 2026 |
| Dara Films Entertainment Ltd | Manufacturing | 2022 |
| Daramak Limited | Administrative & support | 2012 |
| Daranz Ltd | Professional & scientific | 2025 |
| Dare to Glassy Ltd | Wholesale & retail | 2024 |
| Dark Archives Limited | Arts & recreation | 2014 |
| Dark Brick Property Ltd | Real estate | 2024 |
| Darkcaverz Ltd | Other services | 2024 |
| Darkstar Corporation Limited | Arts & recreation | 2009 |
| Darmee BEE Empire Ltd | Health & social care | 2023 |
| Darpar Enterprises Ltd | Construction | 2024 |
| Darsait Solutions Ltd | Information & communication | 2010 |
| Dartmouth Court Residents RTM Company Limited | Administrative & support | 2009 |
| Darul Madinah Slough Limited | Education | 2018 |
| Darul Uloom Slough Ltd | Education | 2024 |
| DAS Associates Limited | Wholesale & retail | 2014 |
| DAS Motors Ltd | Transport & logistics | 2018 |
| DAS Telecom Limited | Information & communication | 2024 |
| Dasg Property Limited | Real estate | 2020 |
| Dash Cleaning & Maintenance Ltd | Administrative & support | 2025 |
| Dash DOT COM Ltd | Education | 2025 |
| Dash Property Services Limited | Real estate | 2016 |
| Dass Legal Ltd | Professional & scientific | 2022 |
| Data Service Centre Ltd | Professional & scientific | 2016 |
| Data Solutions Private Ltd | Information & communication | 2017 |
| Data Technology Consulting Ltd | Professional & scientific | 2025 |
| DATA450 Ltd | Information & communication | 2026 |
| Datacode Tech Limited | Other services | 2018 |
| Datagurukul Systems Limited | Information & communication | 2021 |
| Datalis Ltd | Information & communication | 2022 |
| Datamatica Limited | Information & communication | 2010 |
| Dataphone Electronics Limited | | 1984 |
| Dataplan Holdings Limited | Financial services | 2018 |
| Dataplan Payroll Limited | Administrative & support | 2008 |
| Dataskies Solutions Ltd | Information & communication | 2025 |
| Datawork Consultancy Ltd | Information & communication | 2016 |
| Datchet Carwash Ltd | Administrative & support | 2025 |
| Datchet Cleaning Services Ltd | Administrative & support | 2026 |
| Datchet Court Limited | Real estate | 2022 |
| Datchet Health Club Ltd | Arts & recreation | 2011 |