| D R Smith & Partner Limited | Construction | 2007 |
| D Risk IT Limited | Information & communication | 2015 |
| D Stanford Ltd | Financial services | 2024 |
| D Strutt Ltd | Construction | 2018 |
| D&A Daisy Cleaning Ltd | Administrative & support | 2017 |
| D&C Limited | Hospitality | 2020 |
| D&F Creative Limited | Arts & recreation | 2013 |
| D&M Homes Ltd | Construction | 2022 |
| D-10 Architects Ltd | Professional & scientific | 2012 |
| D-B-R & Gifts Ltd | Manufacturing | 2017 |
| D-B-R Ventures Ltd | Real estate | 2020 |
| D.J.B.N Holdings Ltd | Professional & scientific | 2020 |
| D.M.D.Couriers Limited | Transport & logistics | 1994 |
| D.N.Salter Ltd. | Information & communication | 2018 |
| D.Parrant Driveways Limited | Administrative & support | 2012 |
| D22 Consultancy Services Ltd | Professional & scientific | 2025 |
| D4U Internationals Limited | Wholesale & retail | 2024 |
| DAA Group Ltd | Professional & scientific | 2022 |
| Daadaar Ltd | Hospitality | 2019 |
| Daayi Ltd | Real estate | 2024 |
| Dada Eats Food Ltd | Hospitality | 2025 |
| Daddy Tyres Ltd | Wholesale & retail | 2019 |
| Daiagram Creators Limited | Wholesale & retail | 2021 |
| Daiagram Housing Ltd | Real estate | 2024 |
| Daimensions Ltd | Wholesale & retail | 2016 |
| Dainfern Capital Ltd | Professional & scientific | 2025 |
| Daisy First AID Guildford Ltd | Education | 2023 |
| Daisy Housekeeping Ltd | Other services | 2015 |
| DAK Property Investment Limited | Real estate | 2017 |
| Dalmor Tech Ltd | Information & communication | 2011 |
| Daly International (UK) Limited | Professional & scientific | 1997 |
| Damaenco Holdings Limited | Financial services | 2026 |
| Damia Group Employee Ownership Trustee Limited | Professional & scientific | 2020 |
| Damia Group Ltd | Administrative & support | 1991 |
| Damin International Ltd | Professional & scientific | 2024 |
| Damoco Bidco Limited | Information & communication | 2014 |
| Damoco Holdco Limited | Information & communication | 2014 |
| Damoco Midco Limited | Information & communication | 2014 |
| DAN Olsen Touring Ltd | Arts & recreation | 2018 |
| DAN Shepherd Ltd | Professional & scientific | 2021 |
| Dan's Bazaar Limited | Wholesale & retail | 2025 |
| Dan-Bet Ltd | Transport & logistics | 2025 |
| Dana Bondoc Limited | Health & social care | 2017 |
| Danads International Limited | Information & communication | 2019 |
| Danburykline Ltd | Information & communication | 2012 |
| Dance DEN CIC | Arts & recreation | 2023 |
| Dance Mama CIC | Arts & recreation | 2022 |
| Dance Platform Academy Limited | Arts & recreation | 2011 |
| Dance Platform Clubs Limited | Education | 2026 |
| Dance Platform Supplies Limited | Arts & recreation | 2024 |
| Dani-Lee’S Occupational Therapy Services Ltd | Health & social care | 2021 |
| Daniel LEE Plastering and Rendering Ltd | Construction | 2023 |
| Daniel Ralph Landscapes Limited | Administrative & support | 2003 |
| Daniel.Cz Ltd | Health & social care | 2025 |
| Dansie Consulting Ltd | Administrative & support | 2017 |
| Dansie Property Ltd | Real estate | 2025 |
| Daoust Property Management Ltd | Real estate | 2015 |
| Dapdune Limited | Real estate | 2017 |
| DAR Process Solutions Ltd | Professional & scientific | 2025 |
| Daria Anderson Ltd | Professional & scientific | 2015 |
| Daric Investment Ltd | Construction | 2026 |
| Darien Global Limited | Administrative & support | 2011 |
| Darkart Marketing Limited | Professional & scientific | 2014 |
| Darkwood Group Ltd | Extraterritorial | 2025 |
| Darryl Nash Design and Build Limited | Professional & scientific | 2011 |
| Darwin Management Limited | Professional & scientific | 2016 |
| Dasos Carpentry & Construction Limited | Construction | 2024 |
| Dassian UK Limited | Information & communication | 2015 |
| Data Based Analytics Ltd | Professional & scientific | 2025 |
| Data Made Eazy Ltd | Information & communication | 2023 |
| DATA4GOLF Limited | Education | 2025 |
| Datafort Limited | Information & communication | 2000 |
| Datagoat Limited | Information & communication | 2019 |
| Dataphone Group Limited | Information & communication | 2008 |
| Dataphone International Limited | Information & communication | 2008 |
| Datar Cancer Genetics UK Private Limited | Health & social care | 2019 |
| Dataru Ltd | Information & communication | 2022 |
| Datawell Technologies Limited | Information & communication | 2024 |
| Datex Services Ltd | Information & communication | 2001 |
| Dave Strange Trimming Limited | Wholesale & retail | 2015 |
| Davent PUB Company Limited | Hospitality | 2006 |
| Davern Consultancy Services Limited | Professional & scientific | 2024 |
| David Collins Ltd | Real estate | 2025 |
| David Kane and Sons Limited | Construction | 2023 |
| David Lloyd Associates Limited | Arts & recreation | 1981 |
| David Lloyd Branding Limited | Professional & scientific | 2010 |
| David Morgan Consulting Ltd | Financial services | 2013 |
| David Rose Media Limited | Information & communication | 2012 |
| Davina Photography Ltd | Professional & scientific | 2023 |
| Dawix Ltd | Construction | 2020 |
| Dawkins International Limited | Wholesale & retail | 1958 |
| Dawn Redwood Limited | Real estate | 2022 |
| Dawn Software Limited | Professional & scientific | 2012 |
| Dawnay Trading | Professional & scientific | 2012 |
| Dawnjust Limited | Administrative & support | 1988 |
| Daymar Limited | Professional & scientific | 1995 |
| DB Decorating & Building Services Ltd | Construction | 2026 |
| Dbam Solutions Ltd | Health & social care | 2018 |
| Dbpb Limited | Real estate | 2019 |
| DBT Renovations Ltd | Construction | 2019 |