| D S Day Consulting Ltd | Professional & scientific | 2025 |
| D&B Express Logistics Ltd | Transport & logistics | 2025 |
| D&B Motors Limited | Wholesale & retail | 2021 |
| D&C Real Estate Management Ltd | Real estate | 2023 |
| D&D Community Ltd | Wholesale & retail | 2025 |
| D&E Cars Repair Ltd | Wholesale & retail | 2025 |
| D&G YP Property Services Limited | Real estate | 2024 |
| D&J Auto Expert Ltd | Wholesale & retail | 2024 |
| D&K Superstore Limited | Wholesale & retail | 2020 |
| D&L Services Ltd | Professional & scientific | 2024 |
| D&M Lungu Limited | Public administration | 2018 |
| D&S Capital Properties Ltd | Real estate | 2025 |
| D&S Investment Properties Ltd | Real estate | 2023 |
| D'Angelico's Hairdressers Ltd | Other services | 2023 |
| D'Real African Carribbean Store Limited | Hospitality | 2020 |
| D-Air Services Limited | Construction | 2008 |
| D. & D. Consultants (Hitchin) Limited | Administrative & support | 1985 |
| D. & D. Consultants Limited | Financial services | 1988 |
| D. Summers & SON Ltd | Wholesale & retail | 2020 |
| D. W. Williams Ltd | Administrative & support | 2021 |
| D.E.I. Portfolioenergy Shareholdings Ltd | Financial services | 2026 |
| D.G.M. Innovative Products Limited | Wholesale & retail | 2013 |
| D.G.Story and Company Limited | Professional & scientific | 2008 |
| D.L.H Plumbing Limited | Construction | 2019 |
| D.Peck Contract Carpenters Ltd | Construction | 2003 |
| D10 Property Ltd | Real estate | 2025 |
| D17UK Ltd | Information & communication | 2024 |
| D20 Holdings Ltd | Hospitality | 2019 |
| D2C Management Limited | Professional & scientific | 2022 |
| D2D Couriers Ltd | Transport & logistics | 2016 |
| D2O (Bedford) Ltd | Hospitality | 2007 |
| D3 Property Holdings Ltd | Real estate | 2019 |
| D3 Property Ltd | Construction | 2017 |
| D4F Promotions Limited | Other services | 2022 |
| DA Cargo Transport Ltd | Transport & logistics | 2013 |
| DA Decorators Limited | Construction | 2018 |
| Dabbiedog Ltd | Transport & logistics | 2025 |
| Dabl Holdings Ltd | Real estate | 2024 |
| Dacosyma Ltd | Hospitality | 2025 |
| DAD Property Developments Limited | Real estate | 2025 |
| Dadabhoy Care Limited | Health & social care | 2017 |
| Dadabhoy Property Ltd | Real estate | 2021 |
| Dads & Luke Renovations Ltd | Construction | 2021 |
| Daedalus Computing Limited | Information & communication | 2002 |
| Daffodil Management Limited | Households | 1993 |
| Dagnall Electronics Ltd | Manufacturing | 2011 |
| Dagtees Ltd | Manufacturing | 2024 |
| DAH Kitchen Installations Ltd | Construction | 2014 |
| Daikoku Limited | Professional & scientific | 2008 |
| Daily Essentials Stores UK Ltd | Wholesale & retail | 2025 |
| Daily Living Support Ltd | Health & social care | 2026 |
| Dailysharing Community Wellbeing & Skills CIC | Education | 2026 |
| Daimz Ltd | Hospitality | 2025 |
| Daintyglen Limited | | 1981 |
| Daisy Ellen Ltd | Other services | 2015 |
| Daisy Rylance Limited | Information & communication | 2022 |
| Daitob Limited | Construction | 2013 |
| Daitob Oak Limited | Construction | 2020 |
| Dalajus Ltd | Real estate | 2018 |
| Dalasan Limited | Professional & scientific | 2018 |
| Dalby Investments (Holdings) Ltd | Professional & scientific | 2023 |
| Dale Spalding Consulting Limited | Wholesale & retail | 2021 |
| Dalent Accountancy Limited | Professional & scientific | 2007 |
| Dalgarno Developments Ltd | Real estate | 2026 |
| Dallas Development Limited | Professional & scientific | 2005 |
| Dalston DEN Ltd | Arts & recreation | 2020 |
| Daly Hill Home Renovations Ltd | Construction | 2013 |
| Daman Beauty Salon Ltd | Other services | 2025 |
| Damian's Constructions Ltd | Construction | 2025 |
| Damiano Hair Ltd | Other services | 2020 |
| Damila Transport Ltd Ltd | Transport & logistics | 2025 |
| Damm Solutions Group Limited | Information & communication | 2017 |
| Damnation Breweries Limited | Extraterritorial | 2015 |
| Damnation Consulting Limited | Professional & scientific | 2024 |
| Damnation Limited | Professional & scientific | 2015 |
| Damneris Ltd | Transport & logistics | 2026 |
| DAN Gaze Support Service Ltd | Education | 2022 |
| DAN James Media Limited | Information & communication | 2016 |
| DAN Mcgowan Muay Thai Ltd | Other services | 2021 |
| DAN R Creative Ltd | Information & communication | 2025 |
| Dance-Reeves Limited | Construction | 2007 |
| Dancing on Water CIC | Education | 2026 |
| Dandame Limited | Health & social care | 2022 |
| Dandob Limited | Wholesale & retail | 2018 |
| Dane Lane Management Limited | Extraterritorial | 2015 |
| Daneen Online Ltd | Wholesale & retail | 2026 |
| Danefields Management Company Limited | Households | 1996 |
| Danegrove Decorators Limited | Construction | 1991 |
| Danemouth Investments Limited | Professional & scientific | 2022 |
| Daniel Hartwell Limited | Other services | 2007 |
| Daniel Housing Support CIC | Hospitality | 2018 |
| Daniel Manolescu Limited | Transport & logistics | 2025 |
| Daniel Robertshaw Ltd | Real estate | 2018 |
| Danielle Wills Ltd | Education | 2021 |
| Danielle’S Cleaning Services Ltd | Administrative & support | 2024 |
| Danilo Creative Ltd | Professional & scientific | 2026 |
| Danivas Tradeserv Limited | Wholesale & retail | 2024 |
| Danny Chauffeuring Ltd | Transport & logistics | 2021 |
| Dans Bakery Ltd | Hospitality | 2024 |
| Dante ROY Limited | Real estate | 2022 |