| Dog Bytes Limited | Information & communication | 2022 |
| Dog House Design Fabrication Ltd | Administrative & support | 2019 |
| Dog House Fabrication Ltd | Manufacturing | 2019 |
| Dog Skool Ltd | Other services | 2019 |
| Dogdrive Tech Ltd | Manufacturing | 2025 |
| Dogface Improv Limited | Arts & recreation | 2025 |
| Dogg Mortgages Ltd | Financial services | 2024 |
| DOGWOOF1 Ltd | Information & communication | 2017 |
| Dohpe Ltd | Wholesale & retail | 2024 |
| Doing Nothing Going Nowhere Ltd | Arts & recreation | 2025 |
| Dolby Group Ltd | Professional & scientific | 2007 |
| Dollar International Limited | Professional & scientific | 2022 |
| Dollies Bakery Limited | Wholesale & retail | 2020 |
| Dollies Group Ltd | Wholesale & retail | 2025 |
| Dollys of Norfolk Ltd | Wholesale & retail | 2026 |
| Dolphin Autos (Norwich) Limited | Wholesale & retail | 1973 |
| Dolphin Pride Limited | | 1988 |
| Dolton Contractors Ltd | Construction | 2025 |
| DOM Hills Health Ltd | Arts & recreation | 2019 |
| Domaine DU LAC Ltd. | Mining & quarrying | 2010 |
| Domani Retail Limited | Wholesale & retail | 1976 |
| Domestic and Commercial Ltd | Construction | 2020 |
| Domfix Limited | Construction | 2003 |
| Dominic Bolongaro Project Management Ltd. | Professional & scientific | 2023 |
| Dominic Reid & Company Limited | Administrative & support | 2008 |
| Domlin Productions Limited | Information & communication | 2019 |
| Domluca Limited | Financial services | 2015 |
| Domx Ltd | Transport & logistics | 2016 |
| DON Tech Wind Group Ltd | Construction | 2021 |
| DON Txoko Ltd | Hospitality | 2019 |
| Dona DEI Limited | Financial services | 2020 |
| Donald G Hayden (Chemists) Limited | Wholesale & retail | 1945 |
| Donald Utting & SON Limited | Manufacturing | 1959 |
| Dondra Ltd. | Information & communication | 2023 |
| Done & Dusted Norfolk Ltd | Real estate | 2025 |
| Dong Shen Limited | Hospitality | 2024 |
| Donk Leads Limited | Wholesale & retail | 2026 |
| Donna Pierre Ltd | Health & social care | 2012 |
| Donnini Pizza LLP | | 2022 |
| Dono Plus Ltd | Transport & logistics | 2023 |
| Donoghue Partners Ltd | Information & communication | 2025 |
| Donovan Construction & Engineering Limited | Construction | 2015 |
| Donris Limited | Construction | 2007 |
| Donut Development Ltd | Information & communication | 2026 |
| Doodle Crafts Ltd | Wholesale & retail | 2015 |
| Doodlebug Edge Ltd | Professional & scientific | 2024 |
| Doolally Holdings Limited | Other services | 2019 |
| Doolally Limited | Real estate | 2017 |
| Door Drop Advertising Limited | Transport & logistics | 2020 |
| Door to Door Coach Holidays Ltd | Professional & scientific | 2012 |
| Doordaddy Ltd | Professional & scientific | 2023 |
| Dopamine Daughters Ltd | Other services | 2025 |
| Dorchester Homes Limited | Extraterritorial | 2014 |
| Dorfner Anzaplan UK Limited | Mining & quarrying | 2023 |
| Doris Asset Management Holding Limited | Financial services | 2018 |
| Doris Engineering UK Limited | Professional & scientific | 2024 |
| Dormy House RTM Company Limited | Households | 2012 |
| Doryman Limited | Real estate | 1969 |
| Dosanjh & Co Limited | Transport & logistics | 2012 |
| Dotties Treats & Sweets Ltd | Wholesale & retail | 2022 |
| Dotto International Limited | Information & communication | 1996 |
| Double AA Limited | Hospitality | 2010 |
| Double Bubble Cleaners Ltd | Administrative & support | 2025 |
| Double D Property Holdings Ltd | Real estate | 2025 |
| Double Tree Ventures Limited | Real estate | 2014 |
| Double Trees Baking Ltd | Manufacturing | 2023 |
| Double Trouble Gang PTY Ltd | Wholesale & retail | 2016 |
| Doublekhandyman Ltd | Construction | 2019 |
| Dougal Waters Photography Limited | Professional & scientific | 2004 |
| Dougie Evans | Arts & recreation | 2022 |
| Douglas Bespoke Projects Ltd | Construction | 2024 |
| Douglas Homes (Bristol) Limited | Construction | 2016 |
| Douglas Property Solutions Ltd | Extraterritorial | 2020 |
| Dove House Farm Ltd | Professional & scientific | 2021 |
| Dovecote Estates Limited | Real estate | 2002 |
| Dovedale Homes (Norfolk) Limited | Construction | 2018 |
| Dover Farm Developments Limited | Construction | 2015 |
| Dovercourt Holiday Lodges Limited | Hospitality | 2006 |
| Doves Print & Embroidery Ltd | Manufacturing | 2012 |
| Dovetail Construction Norfolk Ltd | Construction | 2025 |
| Down to Earth Coffee Limited | Hospitality | 2017 |
| DOWNFIELD5 Limited | Professional & scientific | 2013 |
| Downham Grove Ltd | Real estate | 2022 |
| Doxden Environmental Consultants Ltd | Professional & scientific | 2010 |
| Doxi. Ltd | Hospitality | 2022 |
| Doxpilot Ltd | Information & communication | 2025 |
| DP Home Improvements Limited | Construction | 2008 |
| DP Moore Limited | Construction | 2019 |
| DP Offshore NDT Access Ltd | Manufacturing | 2024 |
| DPB Trading Ltd | Wholesale & retail | 2025 |
| DPF Recovery Limited | Wholesale & retail | 2016 |
| DPL Giles Ltd | Construction | 2018 |
| DPM Facilities Management Ltd | Administrative & support | 2019 |
| DPM Group Ltd | Professional & scientific | 2015 |
| DPM Maintenance Services Limited | Construction | 2020 |
| DR a E K Ibrahim Investment Ltd | Real estate | 2024 |
| DR Abrasive Ltd | Wholesale & retail | 2018 |
| DR AEK Ibrahim Ltd | Health & social care | 2016 |
| DR Andy Sluckin Limited | Health & social care | 2014 |
| DR Builders Limited | Construction | 2002 |