| Dani RVD Ltd | Construction | 2019 |
| Daniel & Joseph Group Limited | Professional & scientific | 2020 |
| Daniel & KD Ltd | Health & social care | 2025 |
| Daniel Joseph Construction Ltd | Construction | 2025 |
| Daniel Simpson House Management Company Ltd | Households | 2021 |
| Daniel Smith Photography Ltd | Professional & scientific | 2024 |
| Daniella Freeman Limited | Professional & scientific | 2025 |
| Daniellore Limited | Real estate | 2014 |
| Danish Court Management Company Limited | Households | 1988 |
| Dank Music Ltd | Information & communication | 2025 |
| Dann Ellis Holdings Limited | Financial services | 2022 |
| Danny a Deliveries Limited | Transport & logistics | 2014 |
| DANS86 Ltd | Transport & logistics | 2025 |
| Dansel Productions Ltd | Information & communication | 2025 |
| Danstagger Care Solutions Limited | Health & social care | 2025 |
| Dansun Limited | Wholesale & retail | 2004 |
| Dantaba International Trading Co., Ltd | Wholesale & retail | 2023 |
| Danwood Management Company Ltd | Real estate | 2022 |
| Dany Food International Ltd | Transport & logistics | 2024 |
| Dany Import Export Ltd | Wholesale & retail | 2024 |
| Dapodcare Service Limited | Health & social care | 2022 |
| Dapoma Limited | Health & social care | 2012 |
| Dapworks Limited | Health & social care | 2022 |
| DAR Trans Service Ltd | Transport & logistics | 2019 |
| DAR UL Madinah Croydon Ltd | Education | 2023 |
| Daravid Limited | Real estate | 2012 |
| Darbari & Sodi Investments Limited | Real estate | 2015 |
| Darenth House and Lord House Management Company Limited | Households | 2021 |
| Darhill Limited | Wholesale & retail | 1983 |
| Dari Autos Ltd | Wholesale & retail | 2022 |
| Daria PEA Limited | Administrative & support | 2026 |
| Dark Road Performance Limited | Wholesale & retail | 2017 |
| Darko Investments Limited | Financial services | 2025 |
| Darling Occasions Ltd | Other services | 2016 |
| Darlington Literary Ltd | Information & communication | 2024 |
| Darren Turner Building Services Ltd | Construction | 2014 |
| Darser Limited | Information & communication | 2014 |
| Darton Longman & Todd Limited | Information & communication | 1959 |
| Dartshq Software Ltd | Information & communication | 2026 |
| Dartville Limited | Households | 2001 |
| Darwen Communications Limited | Administrative & support | 2008 |
| Darwen Design Limited | Professional & scientific | 2013 |
| Darwin Court "B" Management Company Limited | Households | 1994 |
| Darwishi Foods Ltd | Wholesale & retail | 2025 |
| Darwishi Properties Ltd | Real estate | 2023 |
| DAS Perfekt Ltd | Wholesale & retail | 2025 |
| DAS UK Limited | Professional & scientific | 2007 |
| Dase Events Ltd | Arts & recreation | 2025 |
| Dash Linen Hire (UK) Ltd | Other services | 2012 |
| Dash Management 1 Ltd | Real estate | 2017 |
| Dasilva Flooring Services Ltd | Construction | 2023 |
| Data Angles Private Limited | Information & communication | 2017 |
| Data Bond Limited | Other services | 2021 |
| Data Consumption Ltd | Financial services | 2021 |
| Data Futures Ltd | Information & communication | 2026 |
| Data Hunt Technologies Limited | Information & communication | 2024 |
| Data Mastery LAB Limited | Information & communication | 2024 |
| Data Umbrella Limited | Wholesale & retail | 2013 |
| Datadox Limited | Information & communication | 2023 |
| Datalearn Limited | Information & communication | 2024 |
| Dataspiro Ltd | Information & communication | 2016 |
| Datavantix Solutions Ltd | Information & communication | 2024 |
| Dataverse.Ai Ltd | Information & communication | 2025 |
| Datheos Ltd | Information & communication | 2024 |
| Datoo Partnership Ltd | Real estate | 2022 |
| Datum AI Labs Ltd | Information & communication | 2023 |
| Datum LND Limited | Construction | 2011 |
| Dauda Fofanah Ltd | Health & social care | 2014 |
| Daughters of Zion Accountants and Consultants Limited | Professional & scientific | 2017 |
| Daughters of Zion Property Management Ltd | Real estate | 2013 |
| Daura Ltd | Professional & scientific | 2020 |
| DAV Property Development and Recruitment Limited | Professional & scientific | 2016 |
| Dava Destiny Global Limited | Other services | 2022 |
| Davalicious Cakes Limited | Manufacturing | 2016 |
| Davco Investments Limited | Real estate | 2012 |
| Dave Sparkling Clean Ltd | Administrative & support | 2025 |
| Davenport House Management Company Limited | Households | 2021 |
| Daveteck Limited | Professional & scientific | 2023 |
| David Alex 13 Ltd | Transport & logistics | 2024 |
| David Autos Ltd | Wholesale & retail | 2024 |
| David Childcare Nursery Limited | Health & social care | 2021 |
| David Elliott Frcs LLP | | 2010 |
| David Guthrie Builders Ltd | Construction | 2023 |
| David Reardon Associates Limited | Extraterritorial | 2005 |
| David Services (UK) Limited | Administrative & support | 2011 |
| David Woollacott Limited | Professional & scientific | 2013 |
| Davidson Road (Freehold) Company Limited | Households | 2012 |
| Davies Engineering Design Limited | Professional & scientific | 2013 |
| Davies Pellen Limited | Real estate | 2016 |
| Davit's Limited | Administrative & support | 2018 |
| Davp Ltd | Construction | 2024 |
| Davray & Sons Investments Ltd | Real estate | 2020 |
| Davyo Ltd | Financial services | 2015 |
| Dawat Art of Cooking Ltd | Hospitality | 2013 |
| Dawn Residential Care Home Limited | Health & social care | 2022 |
| Dawnandglory Ltd | Financial services | 2024 |
| Dawsha 2025 Ltd | Hospitality | 2025 |
| Day Lewis Medical Limited | Wholesale & retail | 1985 |
| Day Lewis PLC | Wholesale & retail | 1975 |
| Day Lewis Properties Limited | Real estate | 2016 |