| Danielle Whyte Ltd | Health & social care | 2021 |
| Danimpex Limited | Professional & scientific | 2004 |
| Danixtraders Limited | Wholesale & retail | 2025 |
| Daniyaal's Martial Arts Academy Ltd | Arts & recreation | 2017 |
| Daniyaal's Training Centre Ltd | Education | 2021 |
| Danjerrys Property Ltd | Real estate | 2023 |
| Danlo Auto Consultants Limited | Wholesale & retail | 2018 |
| Danmic Ltd | Construction | 2024 |
| Danny Bear Ltd | Real estate | 2024 |
| Danny P Music Limited | Information & communication | 2025 |
| Danny Ponder Limited | Hospitality | 2004 |
| DANNYMAC23 Ltd | Construction | 2020 |
| Dannys Tattoo Supplies Ltd | Administrative & support | 1996 |
| Danphils Ltd | Real estate | 2024 |
| Dans Holding Co Limited | Financial services | 2020 |
| Danso Consulting Ltd | Professional & scientific | 2014 |
| Dant Ltd | Wholesale & retail | 2025 |
| Dante Apollo Limited | Information & communication | 2026 |
| Danube Group Ltd | Construction | 2016 |
| Danuke Drivers Ltd | Transport & logistics | 2012 |
| Danvers Estates Ltd | Real estate | 2025 |
| Dany Rendering Solutions Ltd | Construction | 2026 |
| Danzay Ltd | Real estate | 2025 |
| DAO Structural UK Ltd | Construction | 1998 |
| Daphynee's Healthcare Limited | Health & social care | 2024 |
| Dapper Suits Ltd | Wholesale & retail | 2026 |
| Daps Retail Limited | Wholesale & retail | 2025 |
| Dapu Digital Limited | Professional & scientific | 2023 |
| Daqs Limited | Professional & scientific | 2002 |
| DAR AL Zaman Medical Services Limited | Health & social care | 2024 |
| Darandoi Investments Limited | Real estate | 2024 |
| Darbar Smiles Limited | Health & social care | 2025 |
| Darchi Digital Recruitment Limited | Administrative & support | 2013 |
| Daren Persson Funeral Services Limited | Extraterritorial | 2003 |
| Darexxx Limited | Wholesale & retail | 2022 |
| Dargle Holdings Ltd | Professional & scientific | 2020 |
| Dargle Therapeutics Ltd | Professional & scientific | 2022 |
| Darinos Property Ltd | Real estate | 2025 |
| Dark Corner Product Development Limited | Wholesale & retail | 2013 |
| Dark Dinners Ltd | Hospitality | 2019 |
| Dark Green Group (Leven) Ltd | Water & waste | 2025 |
| Dark Green Group (Tyseley) Ltd | Water & waste | 2024 |
| Dark Lake Entertainment Ltd. | Arts & recreation | 2016 |
| Dark Lane Estates Management Company Limited | Households | 2021 |
| Dark Tints Ltd | Other services | 2026 |
| Darkwood Essence Ltd | Wholesale & retail | 2022 |
| Darlington & Co Eco Clean Company Limited | Administrative & support | 2026 |
| Darly Joinery Ltd | Construction | 2025 |
| Darren Eaton Ltd | Transport & logistics | 2026 |
| Darryl (UK) Investments Limited | Health & social care | 2008 |
| Darryl Claypole Owner Driver Ltd | Transport & logistics | 2017 |
| Darsh MM | Financial services | 2020 |
| Darsman Investments Limited | Professional & scientific | 2013 |
| Darsman Property Limited | Real estate | 2017 |
| Dart Building Services Limited | Construction | 2024 |
| Dart Express Ltd | Transport & logistics | 2026 |
| Dartshopper UK Ltd | Wholesale & retail | 2024 |
| Darudi Transport Ltd | Transport & logistics | 2025 |
| Darvisuals Ltd | Professional & scientific | 2025 |
| Darwine Ltd | Health & social care | 2023 |
| Darwins Edge Management Company Limited | Households | 2023 |
| DAS Holdings (Coalville) Ltd | Administrative & support | 2024 |
| DAS Industries Ltd | Arts & recreation | 2012 |
| DAS Property Investment Ltd | Real estate | 2021 |
| Dash Events Ltd | Administrative & support | 2018 |
| Dash Properties & Investments Limited | Real estate | 2017 |
| Dashes Delights Ltd | Wholesale & retail | 2023 |
| Dashlime Limited | Wholesale & retail | 2026 |
| Dashu Housing Limited | Real estate | 2024 |
| Dasram Limited | Real estate | 2019 |
| Dasure Limited | Information & communication | 2019 |
| Daswani Care Limited | Health & social care | 2025 |
| Dasym AGF Limited | Other services | 2018 |
| DAT Media Group Limited | Professional & scientific | 2021 |
| Data 67 Ltd | Information & communication | 2024 |
| Data Acquisition & Testing Services Limited | Professional & scientific | 2008 |
| Data Cabling Limited | Information & communication | 1988 |
| Data Dive Market Research Ltd | Information & communication | 2025 |
| Data First Group Ltd | Information & communication | 2025 |
| Data Heart Community Interest Company | Information & communication | 2020 |
| Data Matrix Solutions Ltd | Professional & scientific | 2014 |
| Data Relay Ltd | Education | 2012 |
| Data Revelation Limited | Information & communication | 2014 |
| Data Science & Advanced Analytics Limited | Information & communication | 2019 |
| Data Software Analytics Ltd | Information & communication | 2023 |
| Data Time Systems Limited | Information & communication | 1999 |
| Data Trends Ltd | Information & communication | 2022 |
| Datability 360 Insight Ltd | Information & communication | 2015 |
| Datacom I.T. Limited | Information & communication | 1997 |
| Dataflow Technology Limited | Professional & scientific | 2015 |
| Datagem Consulting Ltd | Information & communication | 2025 |
| Datahigh Limited | Extraterritorial | 2008 |
| Datalogicals Limited | Information & communication | 2016 |
| Dataluxe Consulting (UK) Ltd | Information & communication | 2026 |
| Datalyst Ltd | Information & communication | 2024 |
| Datamatics Consulting Ltd | Information & communication | 2022 |
| Datamatiq Ltd | Information & communication | 2016 |
| Datapao Limited | Information & communication | 2026 |
| Datapointservices Limited | Information & communication | 2024 |
| Datarich Solutions Limited | Information & communication | 2006 |