| Danesbury Design Limited | Construction | 1999 |
| Danev Brogya Limited | Construction | 2018 |
| Dang Properties & Investment Ltd | Real estate | 2023 |
| Danialrajpoot Ltd | Wholesale & retail | 2025 |
| Danichelle Ltd | Administrative & support | 2005 |
| Daniel Green Audit Solutions Ltd | Professional & scientific | 2025 |
| Daniel Quartly Consultancy Limited | Professional & scientific | 2016 |
| Daniel Thomas Limited | Construction | 2003 |
| Daniela Lucchese Limited | Professional & scientific | 2015 |
| Danielle Andrews Real Estate Ltd | Real estate | 2023 |
| Danielle Styles Limited | Wholesale & retail | 2021 |
| Danmar Interiors Ltd | Construction | 2011 |
| Danmar Kitchens Ltd. | Wholesale & retail | 1998 |
| Danni's Dreamers Limited | Other services | 2025 |
| Danny Kirk Prints Limited | Manufacturing | 2021 |
| Danny's Paintworks Limited | Construction | 2005 |
| Danson Cleaning Services Ltd | Administrative & support | 2021 |
| DAP Architecture Ltd | Professional & scientific | 2022 |
| Dapper Dog Spa Limited | Other services | 2025 |
| Dapper Trader Limited | Financial services | 2022 |
| Darakasa Properties Ltd | Real estate | 2024 |
| Darce Construction Ltd | Construction | 2019 |
| Darcy Mews Management Limited | Households | 2011 |
| Darin Europe Ltd | Wholesale & retail | 2025 |
| Daring Badger Limited | Financial services | 2022 |
| Dario D'Aversa Piano Limited | Information & communication | 2019 |
| Dark Heart Studio Limited | Arts & recreation | 2016 |
| Darkcess Limited | Health & social care | 2022 |
| Darleydale Computing Ltd | Construction | 2006 |
| Darleydale Properties Limited | Administrative & support | 2006 |
| Daromi Land LLP | | 2009 |
| DAS Anaesthetics UK Limited | Health & social care | 2021 |
| Dasari Medical Services Limited | Health & social care | 2019 |
| Dashback Limited | Professional & scientific | 1983 |
| Dashing Detailing Ltd | Administrative & support | 2018 |
| Dasilvasoft Group Ltd | Professional & scientific | 2025 |
| Data Evaluations Limited | Information & communication | 1999 |
| Data Intelligence Limited | Information & communication | 2025 |
| Data Onscale Ltd | Information & communication | 2019 |
| DATA4ANALYTICS Ltd | Information & communication | 2019 |
| Datahive Systems Limited | Information & communication | 2015 |
| Dataintegrate Limited | Professional & scientific | 2025 |
| Datavisual Limited | Information & communication | 2011 |
| Datawave Networks LLP | | 2019 |
| Datum One Limited | Construction | 2026 |
| Davard Care Homes Limited | Health & social care | 1999 |
| Dave Bone Brickwork Ltd | Construction | 2017 |
| Dave Stone Limited | Other services | 2022 |
| Dave Wallis Car Audio Limited | Wholesale & retail | 2000 |
| Davenport Manor Holdings Ltd | Financial services | 2022 |
| David Chilvers Associates Limited | Professional & scientific | 2012 |
| David Harcourt Ltd | Construction | 2008 |
| David Harris Racing Ltd | Arts & recreation | 2022 |
| David Lewis Manufacturing Jewellers Limited | Manufacturing | 2004 |
| David Lewis Mortgage Services Limited | Financial services | 2020 |
| David Lewis Rentals Limited | Administrative & support | 2025 |
| David Lowen Cleaning Services Ltd | Other services | 2015 |
| David Rose Family Investment Company Limited | Professional & scientific | 2024 |
| Davidson UK Services Ltd | Real estate | 2024 |
| Davies Burton Sweetlove Ltd | Professional & scientific | 2010 |
| Davimarc Ltd | Construction | 2025 |
| Davis & Sons Limited | Construction | 2007 |
| Davis and Smith Tiling Ltd | Construction | 2026 |
| Davis Electrical Services Ltd | Construction | 2024 |
| Davisam Limited | Health & social care | 2017 |
| Dawa Care Services Ltd | Hospitality | 2021 |
| Dawson Blake Limited | Construction | 2021 |
| Daxter Limited | Wholesale & retail | 2024 |
| Day Care at the Play Barn Limited | Other services | 2024 |
| Day FL Ltd | Administrative & support | 2024 |
| Day Impex Group Limited | Financial services | 2024 |
| Day Service Properties Limited | Real estate | 2020 |
| Dayakalp Infotech Services Limited | Information & communication | 2013 |
| Dayliss Holdings Limited | Professional & scientific | 2014 |
| Dazms Trading Ltd | Hospitality | 2025 |
| DB Building Engineering Limited | Professional & scientific | 2020 |
| DB Realty Ltd | Real estate | 2020 |
| DB Trading Cards Limited | Wholesale & retail | 2024 |
| Dbmr Properties Ltd | Real estate | 2022 |
| Dbotk Consultancy Ltd | Information & communication | 2016 |
| DBS Datamarketing Ltd | Information & communication | 2007 |
| DBS Solutions Limited | Real estate | 1999 |
| Dbvs Management Ltd | Wholesale & retail | 2010 |
| DC Consultancy Ltd | Information & communication | 2025 |
| DC Finance Limited | Financial services | 2025 |
| DC Hare Ltd | Professional & scientific | 2016 |
| DCC Associates Limited | Administrative & support | 2025 |
| DCE Tech Ltd | Information & communication | 2017 |
| DCG Logistics UK Ltd | Administrative & support | 2016 |
| DCH Sales & Marketing Limited | Administrative & support | 2026 |
| DCM UK Construction Ltd | Construction | 2021 |
| DCM UK Investments Ltd | Real estate | 2023 |
| DCR Beauty Finesse Ltd | Education | 2019 |
| Dcrr Engineering Ltd | Administrative & support | 2023 |
| DCS Consultants Ltd | Public administration | 2013 |
| DCX Group Ltd | Other services | 2021 |
| DCY Project Management Services Ltd | Professional & scientific | 2018 |
| Dd-Scientific Holdings Limited | Financial services | 2020 |
| Dd-Scientific Limited | Manufacturing | 2011 |
| DDH Financial Services Ltd | Financial services | 2016 |