| Days Garage Limited | Other services | 1996 |
| DCG Team UK Limited | Information & communication | 2011 |
| DCH Aviation Limited | Professional & scientific | 2015 |
| Dcnwinee Enterprise Limited | Wholesale & retail | 2025 |
| Dean Land Shaw Management Co Limited | Households | 2019 |
| Debbie Stokeley Medical Aesthetics Ltd | Health & social care | 2026 |
| Decentralised Ventures Ltd | Professional & scientific | 2023 |
| Deco Interni Limited | Wholesale & retail | 2020 |
| Decoration 68 Ltd | Construction | 2021 |
| Deep Purpose Labs Ltd | Professional & scientific | 2026 |
| Deer Stalking Hub Limited | Agriculture & fishing | 2019 |
| Definition Business Services Ltd | Administrative & support | 2019 |
| Degolier Design Ltd | Wholesale & retail | 2019 |
| Delaney Electrical Ltd | Construction | 2025 |
| Delaware Enterprises Limited | Hospitality | 2025 |
| Deli & Daily Ltd | Hospitality | 2024 |
| Della International Limited | Information & communication | 2023 |
| Delmon Place Residents Management Company Limited | Real estate | 2013 |
| Delta Cambio Limited | Professional & scientific | 2014 |
| Delta RAY Limited | Real estate | 2017 |
| Demenex Plant Hire (N.I.) Limited | Construction | 1999 |
| Dental Engineers Limited | Manufacturing | 2022 |
| Dentaquip Limited | Manufacturing | 2025 |
| Desbruslais Limited | Professional & scientific | 2009 |
| Desksmart Limited | Professional & scientific | 2001 |
| Dettifoss Motors Limited | Wholesale & retail | 2015 |
| Developify Solutions Ltd | Wholesale & retail | 2020 |
| Dewar Green Limited | Information & communication | 2005 |
| Dewylnd Limited | Administrative & support | 2021 |
| Dfjs Consulting Limited | Information & communication | 2011 |
| DFP IP Holdings Limited | Administrative & support | 2020 |
| DH Coatings Group Ltd | Construction | 2023 |
| DH Decorating Ltd | Construction | 2017 |
| DH Fire Coatings Ltd | Construction | 2023 |
| Dial Services Machinery Limited | Manufacturing | 2009 |
| Diana James Couture Ltd | Information & communication | 2022 |
| Dico Limited | Information & communication | 2004 |
| Didaktik Limited | Professional & scientific | 2022 |
| Difficult Third Album Ltd | Other services | 2020 |
| Digit IT Solutions Ltd | Information & communication | 2024 |
| Digital AD Experts Ltd | Professional & scientific | 2021 |
| Digital Berry Ltd | Information & communication | 2019 |
| Digital Nomads DEV Limited | Information & communication | 2025 |
| Digital Value Added Ltd | Information & communication | 2007 |
| DII Global Ltd | Administrative & support | 2019 |
| Dinnages Garages Limited | Wholesale & retail | 1935 |
| Dinnages Holdings Limited | Real estate | 1991 |
| Dino Capital Limited | Financial services | 2020 |
| Direct Home Maintenance Ltd | Administrative & support | 2024 |
| Dise International Limited | Information & communication | 2014 |
| Dispute Consulting Ltd | Professional & scientific | 2019 |
| Dispute Resolution Management & Consulting Limited | Professional & scientific | 2019 |
| Disputeiq Limited | Professional & scientific | 2025 |
| Distell International Holdings Limited | Manufacturing | 2016 |
| Ditton Place Freehold Company Limited | Households | 2018 |
| Ditton Place Utilities Limited | Other services | 2019 |
| DJ Jaydee Limited | Transport & logistics | 2018 |
| Djmcm Ltd | Professional & scientific | 2022 |
| DK Business Growth Limited | Professional & scientific | 2019 |
| DK Fabrication Ltd | Construction | 2021 |
| DKS Marketing Ltd. | | 1989 |
| DLB Developments Limited | Real estate | 2017 |
| DMC Building Services Limited | Construction | 2008 |
| Doctorsupdates Limited | Education | 2004 |
| DOE Rental Management Limited | Real estate | 2025 |
| Dogchums Limited | Professional & scientific | 2010 |
| Dogwood Services Limited | Agriculture & fishing | 2015 |
| Dollman Ralston Limited | Construction | 1998 |
| Domicile Realty UK PVT Ltd | Real estate | 2019 |
| Dominic Johnson Limited | Administrative & support | 2010 |
| Donate to Educate Fundraising Ltd | Wholesale & retail | 2025 |
| Donna Vincent Estate Agents Ltd | Real estate | 2024 |
| Doodie Stark Limited | Wholesale & retail | 2009 |
| Dorf Ventures Limited | Professional & scientific | 2012 |
| Dorman Limited | Professional & scientific | 2013 |
| DOT255 Ltd | Information & communication | 2022 |
| Dots Property Solutions Ltd | Real estate | 2019 |
| Double J Consultants Limited | Professional & scientific | 2021 |
| Dowling Creative Limited | Manufacturing | 2006 |
| Downscroft Limited | Professional & scientific | 1997 |
| DP GAS Services Limited | Construction | 2007 |
| DPC Sales & Service Limited | Wholesale & retail | 1986 |
| DPG Financial Solutions Ltd | Other services | 2017 |
| DR Bird Psychology Limited | Health & social care | 2024 |
| DR Michael Bott LLP | | 2010 |
| DR Michael White Limited | Administrative & support | 2010 |
| DR Noorderhaven Psychological Services Limited | Public administration | 2024 |
| DR Rose Spencer Limited | Health & social care | 2022 |
| Drage Construction Ltd | Construction | 2014 |
| Dragoon Solutions Limited | Information & communication | 2007 |
| Drainboss Plumbing and Drainage Limited | Other services | 2013 |
| Drake Developments Limited | Real estate | 1994 |
| Drayton Plumbing & Heating Ltd | Construction | 2003 |
| DRG Plastic Surgery Limited | Health & social care | 2002 |
| Drinks Delivery Group Ltd | Wholesale & retail | 2025 |
| Drjm Limited | Professional & scientific | 2013 |
| Drmsr Ltd | Health & social care | 2022 |
| Drone Property Inspections Limited | Professional & scientific | 2025 |
| Drucero Limited | Professional & scientific | 2008 |
| DS Maternity Limited | Health & social care | 2018 |