| DJ Contemporary Ltd | Wholesale & retail | 2023 |
| DJ Greaves Ltd | Information & communication | 2007 |
| DJ Spicer & Co Ltd | Construction | 2015 |
| Djhoc Ltd | Professional & scientific | 2026 |
| Djmp Consulting Limited | Professional & scientific | 2012 |
| DJV Solutions Limited | Administrative & support | 2015 |
| DK Fencing and Landscaping Limited | Construction | 2016 |
| DK Law Limited | Professional & scientific | 2019 |
| DK Tuition Ltd | Education | 2024 |
| Dkfastfood Limited | Hospitality | 2025 |
| DLB Roofing Limited | Construction | 2018 |
| Dlml Holdings Limited | Financial services | 2022 |
| Dlml Investments Limited | Financial services | 2022 |
| DM8786 Limited | Transport & logistics | 2018 |
| Dmad Ltd | Professional & scientific | 2023 |
| DMG Roofing Services Ltd | Construction | 2019 |
| DMZ Properties Limited | Administrative & support | 2020 |
| DN Consultancy Services Ltd | Professional & scientific | 2017 |
| DN Create Ltd | Professional & scientific | 2021 |
| DN Talent Ltd | Professional & scientific | 2021 |
| DO IT Justice Limited | Other services | 2019 |
| Doa-Kin Supported Living Limited | Health & social care | 2019 |
| Dobanti Limited | Real estate | 1999 |
| Doberman Watches Ltd | Other services | 2025 |
| Docproc Consulting Limited | Information & communication | 2018 |
| Doctor Clean Solutions Ltd | Administrative & support | 2025 |
| Doctored Pictures Ltd | Information & communication | 2018 |
| Doctors Personal Branding Consultancy Limited | Information & communication | 2024 |
| Dodomi Tunbridge Limited | Hospitality | 2023 |
| Dolitics Ltd | Professional & scientific | 2022 |
| Dolphin Park Limited | Real estate | 2005 |
| Domain Property LLP | | 2018 |
| Domehill Ltd | Hospitality | 2004 |
| Domus Extra Care Limited | Health & social care | 2013 |
| Domus Finance Ltd | Financial services | 2013 |
| Domus Live-In Care Limited | Health & social care | 2013 |
| Donald Barron Consultancy Limited | Professional & scientific | 2023 |
| Donbros Limited | Administrative & support | 1984 |
| Donohomes Property Management Ltd | Real estate | 2025 |
| Donovan Development Limited | Construction | 2017 |
| Donovan Proclean Solutions Ltd | Administrative & support | 2026 |
| Doorstep Baker Ltd | Manufacturing | 2020 |
| Dorc Productions Limited | Information & communication | 2010 |
| Doric Property Solutions Limited | Construction | 2016 |
| Dorin Court Residents Association Limited | Households | 1988 |
| Doris Resources LLP | | 2010 |
| Dornden House Drive Limited | Households | 1999 |
| Dorset Court Hawkenbury Management Company Limited | Households | 1984 |
| Dorwin Limited | Construction | 2023 |
| DOT Lush Digital Limited | Professional & scientific | 2022 |
| Double Click Solutions Limited | Information & communication | 1997 |
| Double Loop Labs Ltd | Information & communication | 2025 |
| Doubleshotcomms Limited | Professional & scientific | 2022 |
| Dovetail Clerkenwell Ltd | Hospitality | 2021 |
| Dowdy Universal Development Estates Ltd | Real estate | 2025 |
| Downtown Fish & Chips Limited | Hospitality | 2025 |
| Dozafic Limited | Financial services | 2017 |
| DPC Capital Limited | Professional & scientific | 2009 |
| DPC Management & Research LLP | | 2009 |
| DPC Real Estate LLP | | 2009 |
| DPR Management Co. Ltd | Households | 2016 |
| DPT Services Limited | Health & social care | 2007 |
| DR Building Ltd | Construction | 2018 |
| DR Charlotte Cremin Ltd | Health & social care | 2025 |
| DR PB Van WYK Limited | Health & social care | 2009 |
| DR Sparrow Aesthetics Ltd | Wholesale & retail | 2020 |
| DR. Jean Mcpherson Ltd | Health & social care | 2023 |
| Dragonfly Farm Ltd | Agriculture & fishing | 2020 |
| Drainage Technical Services Limited | Construction | 2011 |
| Dranreb Limited | Health & social care | 2015 |
| Draulix Limited | Professional & scientific | 1998 |
| Drawarehouse Ltd | Real estate | 2012 |
| Drawer Limited | Arts & recreation | 1999 |
| Drax Industries Limited | Information & communication | 2014 |
| Dreamer Postproduction Ltd | Administrative & support | 2014 |
| Dreamfinch Homes Limited | Construction | 2004 |
| Dreamforce Consulting Ltd | Professional & scientific | 2025 |
| Dreamlogic Ltd | Information & communication | 2025 |
| Dress Dreams Limited | Wholesale & retail | 2014 |
| Drive Elite Ltd | Wholesale & retail | 2024 |
| Drive Sales Limited | Wholesale & retail | 2008 |
| Drizzle Oils Limited | Manufacturing | 2024 |
| Dronatix Ltd | Professional & scientific | 2024 |
| DS Assistance Limited | Health & social care | 2015 |
| DS Farming Limited | Financial services | 2024 |
| Ds&F Ltd | Information & communication | 2019 |
| DSA Associates Ltd | Financial services | 2018 |
| Dsign Vinyl Ltd | Manufacturing | 2016 |
| DSP Print Services Limited | Manufacturing | 1997 |
| DSR Global Limited | Professional & scientific | 2008 |
| DT Chantler Motor Engineer Limited | Wholesale & retail | 2025 |
| DTM Properties Ltd | Real estate | 2023 |
| DTV Courier Limited | Transport & logistics | 2018 |
| Duart Consulting Ltd | Professional & scientific | 2022 |
| Ducas Ltd | Administrative & support | 2007 |
| Duck Fair Ltd | Information & communication | 2020 |
| Dudley Road Investments Limited | Construction | 2020 |
| Dudydent Ltd | Health & social care | 2018 |
| Duffield Digital Marketing Ltd | Information & communication | 2025 |
| Duke Street Developments (Ipswich) Limited | Professional & scientific | 2005 |