| Druthers Noble Limited | Real estate | 2024 |
| DRY Catering Limited | Hospitality | 2016 |
| Dryden Properties Ltd | Real estate | 2020 |
| Drymec Limited | Wholesale & retail | 1993 |
| DS Aviation Services Limited | Wholesale & retail | 2024 |
| DS Industrial Ltd | Construction | 2019 |
| DSD Construction Norfolk Ltd | Construction | 2021 |
| Dsdl Limited | Professional & scientific | 2012 |
| DSG Multi Services Limited | Construction | 2010 |
| DSJ Accountancy Limited | Professional & scientific | 2015 |
| DSJ Cromer Limited | Wholesale & retail | 2022 |
| DSL International Ltd | Transport & logistics | 2023 |
| DSM Manufacturing Limited | Administrative & support | 2020 |
| Dsvj Investments Ltd | Financial services | 2026 |
| DSZ Partnership Ltd | Manufacturing | 2011 |
| DT & PS Rajan Medical Consultants Ltd | Health & social care | 2012 |
| Dtek Horticulture Ltd | Professional & scientific | 2018 |
| DTG Brickwork Contractors Limited | Construction | 2006 |
| DTL Education Ltd | Professional & scientific | 2012 |
| Dtmarket Limited | Wholesale & retail | 2026 |
| DTO Innovations Ltd | Professional & scientific | 2023 |
| DTO Metamorphosis Ltd | Financial services | 2023 |
| Duarte E Companhia Ltd | Wholesale & retail | 2019 |
| Dubar Investments Ltd | Construction | 2016 |
| Duck Hook Limited | Professional & scientific | 2025 |
| Duct Wizards Ltd | Construction | 2021 |
| Dude Where's My Cash Ltd | Real estate | 2016 |
| Dudleys Events Ltd | Hospitality | 2024 |
| DUE Dating Ltd | Arts & recreation | 2025 |
| Duet Creative Ltd | Other services | 2023 |
| Duetrade Software Ltd | Information & communication | 2022 |
| Duff Morgan & Vermont (Dereham Road) Limited | Professional & scientific | 1965 |
| Duff Morgan & Vermont (Holdings) Limited | Professional & scientific | 1923 |
| Duff Morgan & Vermont Limited | Wholesale & retail | 1969 |
| Duff Morgan Finance Limited | Professional & scientific | 1951 |
| Duff, Morgan & Vermont (Thetford) Limited | Professional & scientific | 1914 |
| Duff-Star 2 Ltd | Construction | 2018 |
| Duffield Systems Ltd | Professional & scientific | 2026 |
| Duffy Assets Ltd | Manufacturing | 2011 |
| Duffy Estate Properties Ltd | Construction | 2025 |
| Dugdale Builders Limited | Construction | 2024 |
| Dugsco Limited | Real estate | 2010 |
| Duke Street Lettings Ltd | Real estate | 2008 |
| Duke Street Norwich Management Co. Limited | Households | 1994 |
| Duke's Palace Wharf (Norwich) Management Co, Limited | Households | 2005 |
| Duncan Carter Marketing Limited | Wholesale & retail | 2014 |
| Duncom Hill Limited | Hospitality | 2018 |
| Dunford Holdings Limited | Financial services | 2018 |
| Dunham Cash Registers Limited | Other services | 1993 |
| Dunhams Washroom Systems Ltd | Manufacturing | 2018 |
| Dunhil Estates Limited | Real estate | 1996 |
| Dunkirk Garage Norfolk Limited | Wholesale & retail | 2017 |
| Dunkirk Property Limited | Real estate | 2017 |
| Dunn & Co Properties Ltd | Real estate | 2018 |
| Dunn by Design Limited | Professional & scientific | 2007 |
| Dunn Inns Ltd | Hospitality | 2018 |
| Dunne and Family Limited | Hospitality | 2015 |
| Dunnella Limited | Construction | 1987 |
| Dunning Bayfield Ltd | Construction | 2025 |
| Dunning Lettings Ltd | Real estate | 2025 |
| Dunning Timber Frames Ltd | Construction | 2006 |
| Dunns Beds Limited | Wholesale & retail | 2020 |
| Dunnybuild Ltd | Construction | 2021 |
| Dunroamin Developments Limited | Construction | 2011 |
| Dunsfold Airport Limited | Real estate | 2011 |
| Dunthorne Developments Ltd | Administrative & support | 2022 |
| Dunvant Spice Ltd | Hospitality | 2020 |
| Durand-Grace Property Holdings Ltd | Real estate | 2026 |
| Durnwell Strategies Ltd | Administrative & support | 2015 |
| Duror Management & Concept Development Ltd | Professional & scientific | 2025 |
| Durrant Electrical & Mechanical Ltd | Construction | 2006 |
| Durrant Estates Ltd | Financial services | 2017 |
| Durrell and Martin Ltd | Real estate | 2025 |
| Durrell Holdings Limited | Real estate | 2021 |
| Durrell Property Development Limited | Construction | 2017 |
| Dusk Brewing Co Ltd | Manufacturing | 2021 |
| Dussindale & Hellesdon Rovers FC Limited | Arts & recreation | 2022 |
| Dutch Greenhouse UK Limited | Financial services | 2022 |
| Dutton Communications Limited | Information & communication | 2013 |
| DV Creative Limited | Professional & scientific | 2020 |
| Dvap Logistic Ltd | Transport & logistics | 2026 |
| DVM & S Limited | Health & social care | 2020 |
| DW Eco Consultancy Ltd | Professional & scientific | 2023 |
| DW Offshore Co Ltd | Administrative & support | 2020 |
| DW Properties East Ltd | Real estate | 2023 |
| Dw-Infosec Ltd | Information & communication | 2024 |
| Dwat Contractor's Ltd | Other services | 2016 |
| Dweller Ltd | Construction | 2018 |
| Dwija Diamond Ltd | Wholesale & retail | 2025 |
| DWS Plumbing & Heating Ltd | Construction | 2016 |
| Dycal Ltd | Real estate | 2018 |
| Dye's Pharmacy Limited | Wholesale & retail | 1995 |
| Dyer Properties Ltd | Real estate | 2022 |
| Dyers Arms 002 Ltd | Real estate | 2017 |
| Dyers Yard (Norwich) Limited | Households | 1998 |
| Dylamo Group Ltd | Manufacturing | 2025 |
| DYNAM1C CNC Ltd | Professional & scientific | 2023 |
| Dynamic Club Shops Limited | Wholesale & retail | 2015 |
| Dynamic Digital Imaging Limited | Manufacturing | 2002 |
| Dynamic Fitness & Coaching Limited | Arts & recreation | 2012 |