| D.J.E Building Ltd | Construction | 2024 |
| D.M. Gagg Ltd | Transport & logistics | 2006 |
| D1G1TAL Ltd | Information & communication | 2023 |
| D2 Management Services (Kent) Ltd | Real estate | 2024 |
| D2 Management Services Limited | Administrative & support | 1988 |
| D4 Consulting Limited | Professional & scientific | 2026 |
| D48 Ltd | Wholesale & retail | 2025 |
| Dactary Transport VAT Limited | Transport & logistics | 2023 |
| Daily Vibe Limited | Wholesale & retail | 2026 |
| Daisys Dog Shack Ltd | Manufacturing | 2024 |
| Dakota RAE Limited | Professional & scientific | 2013 |
| Daley Graphics Limited | Professional & scientific | 2017 |
| Damco Limited | Construction | 2024 |
| Damitee Ltd | Public administration | 2022 |
| DAN P Edwards Ltd | Transport & logistics | 2022 |
| Dan-Go Transport Ltd | Transport & logistics | 2019 |
| Daneware Limited | Information & communication | 2006 |
| Daniel James Properties Limited | Real estate | 2003 |
| Daniel Pratt Ltd | Health & social care | 2026 |
| Daniel Swietlik Transport Ltd | Transport & logistics | 2026 |
| Dankay Service Ltd | Health & social care | 2022 |
| Danny V Production Ltd | Manufacturing | 2026 |
| Danowil Technology Limited | Information & communication | 2008 |
| Danro Asset Management Ltd | Real estate | 2026 |
| Danro Holdings Ltd | Financial services | 2026 |
| Danro One Ltd | Professional & scientific | 2026 |
| Danro Two Ltd | Professional & scientific | 2026 |
| Dans Automotive Media Ltd | Wholesale & retail | 2026 |
| Dantary's Noble Path Ltd | Wholesale & retail | 2025 |
| Dantech Software Ltd | Information & communication | 2016 |
| Danzara UK Ltd | Other services | 2024 |
| Dapperdrives Ltd | Transport & logistics | 2023 |
| Dare to Differ (Kent) | Education | 2017 |
| Darian Clothing Ltd | Wholesale & retail | 2021 |
| Darling Doodles Ltd | Other services | 2021 |
| Darrens Gutters Ltd | Administrative & support | 2026 |
| Data Marketplace Ltd | Information & communication | 2016 |
| Datalitics Ltd | Information & communication | 2021 |
| Datavex Labs Ltd | Information & communication | 2026 |
| Datblygiadau Rosemount Developments Ltd | Construction | 2021 |
| Datotem Limited | Wholesale & retail | 2020 |
| Datura Drop Limited | Professional & scientific | 2021 |
| Davenport Property Investments Ltd | Real estate | 2026 |
| David Batchelor Consulting Limited | Professional & scientific | 2017 |
| David Bellamy Consulting Ltd | Professional & scientific | 2020 |
| David Crosby Safety Services Ltd | Construction | 2017 |
| David Haulage Contractors Ltd | Transport & logistics | 2016 |
| David Westby Consulting Limited | Information & communication | 2022 |
| Davidom Ltd | Construction | 2017 |
| Davids Doggie Dinners Limited | Wholesale & retail | 2014 |
| Davies Parker Associates Limited | Construction | 2016 |
| Daylite Shutters and Blinds Ltd | Construction | 2021 |
| Daytrad Limited | Construction | 2011 |
| DB Auto Doors Limited | Manufacturing | 2025 |
| DB Plumbing Limited | Construction | 2015 |
| DB Safety Limited | Professional & scientific | 2025 |
| DBG Studio Ltd | Manufacturing | 2022 |
| DBM Properties Ltd. | Administrative & support | 2003 |
| DCO Studios Ltd. | Information & communication | 2024 |
| DDD Design Limited | Construction | 2004 |
| DDS (International) Limited | Administrative & support | 2011 |
| DE Boos Construction Limited | Construction | 2022 |
| Deal Terrace RTM Company Limited | Real estate | 2007 |
| Dean Flannery Carpentry & Building Services Ltd | Construction | 2014 |
| Debbie Coleman Ltd | Administrative & support | 2021 |
| Debonaire Limited | Health & social care | 2018 |
| Deborah-Swe Limited | Information & communication | 2023 |
| Debross Holdings Ltd | Financial services | 2019 |
| Dedhapi Limited | Other services | 2016 |
| Deehamper Ltd | Wholesale & retail | 2025 |
| Defibrillator Productions Limited | Arts & recreation | 2012 |
| Defo Group Limited | Arts & recreation | 2019 |
| Dekes Place Ltd | Real estate | 2026 |
| Dekeshaven Ltd | Real estate | 2025 |
| Dekorium Ltd | Wholesale & retail | 2025 |
| Dela Fire and Security Limited | Construction | 2010 |
| Delmark Painting and Decorators Limited | Administrative & support | 2009 |
| Delores B Ltd | Real estate | 2026 |
| Delta Sparks Limited | Construction | 2024 |
| Delta Timing Ltd | Professional & scientific | 2024 |
| Demax Care Limited | Health & social care | 2015 |
| Demelza Hospice Care for Children | Health & social care | 1994 |
| Demelza Trading Ltd | Wholesale & retail | 1995 |
| Den&Co Trans Ltd | Transport & logistics | 2021 |
| Denbar Properties Ltd | Real estate | 2023 |
| Denbar Property Maintenance Limited | Construction | 2002 |
| Dene Court Management Company (Sittingbourne) Limited | Real estate | 2001 |
| Denimex Ltd | Transport & logistics | 2023 |
| Denly Willis Green Mortgages Ltd | Financial services | 2020 |
| Denmaur Independent Papers Limited | Wholesale & retail | 1983 |
| Dennett Employment Services Limited | Administrative & support | 2018 |
| DEP Electrical Engineering Limited | Professional & scientific | 2003 |
| Derinbade Foods Limited | Hospitality | 2015 |
| Design Quarter (UK) Limited | Professional & scientific | 2004 |
| Designline 2000 Limited | Wholesale & retail | 1990 |
| Designs by Sara Ltd | Professional & scientific | 2010 |
| Designserve Limited | Professional & scientific | 2015 |
| Destron Investments Ltd | Professional & scientific | 2010 |
| Devine Construction Services UK Limited | Construction | 2022 |
| Devine Grounds Maintenance Ltd | Administrative & support | 2025 |