| Dennis Lowe Theatre Company Limited | Arts & recreation | 2002 |
| Denny Carpentry Ltd. | Construction | 2001 |
| Denny Lodge Farms Ltd | Agriculture & fishing | 2018 |
| Denon Reed Music Ltd | Information & communication | 2025 |
| Dent Ace PDR Limited | Wholesale & retail | 2010 |
| Dental Laboratories Ltd | Manufacturing | 2020 |
| Dentuition Ltd | Health & social care | 2019 |
| Deputy Solutions Limited | Extraterritorial | 2026 |
| Deray Limited | Hospitality | 2023 |
| Derby Road Car Sales 2015 Limited | Wholesale & retail | 2016 |
| Dermamed Studio Limited | Health & social care | 2025 |
| Derrick Brown Services Limited | Manufacturing | 2012 |
| Desi Food Junction Ltd | Hospitality | 2024 |
| Design Assets Ltd | Real estate | 2008 |
| Design Reach Limited | Administrative & support | 2009 |
| DESIGNED4DRESSAGE Limited | Agriculture & fishing | 2021 |
| Designer Bathrooms Ltd | Construction | 2016 |
| Designer Metal (Suffolk) Limited | Manufacturing | 2006 |
| Designs on Metal Ltd | Manufacturing | 2021 |
| Desserts R US Ltd | Wholesale & retail | 2021 |
| Destination Core Limited | Information & communication | 2019 |
| Destriere Ltd | Transport & logistics | 2018 |
| Detact Diagnostics Ltd | Health & social care | 2020 |
| Details Limited | Manufacturing | 2004 |
| Dette's Weddings Ltd Ltd. | Hospitality | 2016 |
| Develop Core Initiatives Ltd | Construction | 2023 |
| Development Financial and Management Services Limited | Real estate | 1991 |
| Developments by Design Ltd | Real estate | 2020 |
| Devereux Aaron Holdings Ltd | Construction | 2021 |
| Devine Improvements Limited | Construction | 2023 |
| Devlin Associates Limited | Real estate | 1999 |
| Devon Software Services Limited | Information & communication | 2017 |
| Dewberry Redpoint Limited | Information & communication | 1995 |
| Dewson Entertainments Ltd | Arts & recreation | 2002 |
| Dexter Groundworks Limited | Construction | 2025 |
| Dezt Ltd | Real estate | 2025 |
| DF Safety Solutions Ltd | Professional & scientific | 2026 |
| DFF Transport Ltd | Transport & logistics | 2025 |
| Dfztf Holdings Ltd | Financial services | 2026 |
| DG Accessible Designs Limited | Health & social care | 2015 |
| DG Beauty House Ltd | Other services | 2022 |
| DG Catering Management Ltd | Hospitality | 2021 |
| DG Haulage Ltd | Transport & logistics | 2025 |
| DG Nova Ltd | Real estate | 2024 |
| DG Painters & Decorators Ltd | Other services | 2024 |
| DG Stays Limited | Real estate | 2025 |
| DG Worldwide Group Limited | Wholesale & retail | 2022 |
| DGC Wholesale and Ventures Ltd | Information & communication | 2017 |
| Dgjtrading Limited | Wholesale & retail | 2019 |
| Dglandscapes Limited | Agriculture & fishing | 2023 |
| Dgmcare Limited | Health & social care | 2025 |
| DGS Intellisol Ltd | Information & communication | 2023 |
| DH & KH FIC2 Limited | Financial services | 2025 |
| Dhaka Ipswich Ltd | Hospitality | 2024 |
| Dharma Consulting Limited | Information & communication | 2016 |
| DHE Professional Limited | Administrative & support | 2009 |
| DI Nero Group Ltd | Health & social care | 2022 |
| DIA Solutions Ltd | Transport & logistics | 2015 |
| Diablo Graphics Limited | Professional & scientific | 2004 |
| Dial a Pizza Ltd | Hospitality | 2020 |
| Dial Square Advisory Ltd | Professional & scientific | 2025 |
| Dial-A-Cleaner Ltd | Administrative & support | 2026 |
| Dialled Cycle Works Ltd | Wholesale & retail | 2021 |
| Diamond Facial Asthetics UK Ltd | Health & social care | 2021 |
| Diamond Groundwork Ltd | Construction | 2025 |
| Diamond Media Group International Ltd | Wholesale & retail | 2016 |
| Diamond View Cleaning Solutions Limited | Administrative & support | 2017 |
| Diana International Trades Ltd | Wholesale & retail | 2025 |
| Dice Store Ltd | Wholesale & retail | 2025 |
| Dickens Enterprises Ltd | Wholesale & retail | 2022 |
| Dicky FOX Ltd | Administrative & support | 2024 |
| Diesel Injectors UK Ltd. | Wholesale & retail | 2016 |
| DIESEL1990 Ltd | Transport & logistics | 2022 |
| Dieselrush Ltd | Wholesale & retail | 2019 |
| Digalb Services Ltd | Wholesale & retail | 2024 |
| Digger Stuff Limited | Administrative & support | 2016 |
| Diggerwork Construction Limited | Construction | 2015 |
| Digicounted Ltd | Wholesale & retail | 2022 |
| Digidoit Ltd | Professional & scientific | 2014 |
| Digitaas Ltd | Information & communication | 2020 |
| Digital 299 Limited | Wholesale & retail | 2008 |
| Digital Aspirations Limited | Information & communication | 2022 |
| Digital Destiny Limited | Information & communication | 2026 |
| Digital Dimensions Aerial and Satellite Limited | Information & communication | 2011 |
| Digital Installs Ltd | Construction | 2019 |
| Digital Line Media Limited | Professional & scientific | 2017 |
| Digitalappsservices Limited | Hospitality | 2021 |
| Digitalintelliapps Limited | Hospitality | 2020 |
| Digitalle Limited | Information & communication | 2010 |
| Digitera Limited | Professional & scientific | 2025 |
| Digitise Suffolk Labs Limited | Information & communication | 2026 |
| Digitson Ltd | Information & communication | 2025 |
| Diligenta Consultancy Limited | Professional & scientific | 2008 |
| Dimension Creative Ltd | Professional & scientific | 2020 |
| Dimension Eighty Eight (Holdings) Limited | Financial services | 2019 |
| Dimension Eighty Eight HR and Training Limited | Professional & scientific | 2011 |
| Dimitrov 87 Ltd | Transport & logistics | 2017 |
| Dimotta Strategic Services Limited | Administrative & support | 2019 |
| Dinamic 85 Services Ltd | Transport & logistics | 2021 |
| Dincer Property Ltd | Real estate | 2019 |