| D Gooch Limited | Construction | 2003 |
| D Hall Mrics Ltd | Professional & scientific | 2024 |
| D Harris Properties Ltd | Real estate | 2021 |
| D J Engineering Limited | Construction | 2000 |
| D J Newson Optical Limited | Manufacturing | 2008 |
| D J W Transport (NFK) Ltd | Transport & logistics | 2013 |
| D JLS Transport Ltd | Transport & logistics | 2025 |
| D M Thatching Ltd | Construction | 2011 |
| D N a Apprenticeships Ltd | Education | 2016 |
| D N Grady & Sons (Building) Limited | Construction | 2015 |
| D N W Electrical Ltd | Construction | 2008 |
| D R Stamp Ltd | Wholesale & retail | 2024 |
| D S Rudd Properties Ltd | Real estate | 2022 |
| D Starkings Ltd | Agriculture & fishing | 2008 |
| D T Timber Limited | Agriculture & fishing | 2022 |
| D Trett Property Limited | Real estate | 2025 |
| D Type Developments Limited | Wholesale & retail | 2008 |
| D W Surfacing (Eastern) Limited | Construction | 2012 |
| D Watts Limited | Agriculture & fishing | 2017 |
| D Weatheritt Plumbing Services Limited | Water & waste | 2016 |
| D&D Auto Solutions Ltd | Wholesale & retail | 2025 |
| D&D Repairs Ltd | Wholesale & retail | 2022 |
| D&D Transport Ltd | Transport & logistics | 2013 |
| D&F Bensley Limited | Construction | 2014 |
| D&J Family Investment Company | Financial services | 2012 |
| D&L MC Limited | Real estate | 2020 |
| D&L Properties (Norwich) Limited | Real estate | 2020 |
| D&O Pastry&Cake Limited | Manufacturing | 2022 |
| D&S Group PVT Ltd | Wholesale & retail | 2025 |
| D-Duo Limited | Hospitality | 2019 |
| D-Mac Integrity Services Limited | Other services | 2025 |
| D. & F. Mccarthy Limited | Wholesale & retail | 1939 |
| D. R. W. Construction Ltd | Construction | 2019 |
| D. Want Plumbing Limited | Construction | 2016 |
| D.A.D.Electrical Limited | Construction | 1981 |
| D.A.G Civils Ltd. | Construction | 2012 |
| D.A.T.A.S. Limited | Administrative & support | 1999 |
| D.B. Norfolk Estates Ltd | Real estate | 2023 |
| D.B.L. Automotion Ltd | Wholesale & retail | 2025 |
| D.C. Bennett Limited | Real estate | 2003 |
| D.Carter Electrical Ltd | Construction | 2025 |
| D.D. Health & Safety Supplies Limited | Wholesale & retail | 1978 |
| D.H.Sanderson and SON Limited | Agriculture & fishing | 1957 |
| D.I Installations Ltd | Construction | 2019 |
| D.L.H. Autorecyclers Limited | Water & waste | 2007 |
| D.Lewis Scaffolding Ltd | Construction | 2009 |
| D.M & J.L Webster Ltd. | Arts & recreation | 2014 |
| D.M. Layden Limited | Construction | 2003 |
| D.M.W. Transport Limited | Transport & logistics | 1980 |
| D.N. Grady & Sons Limited | Construction | 1996 |
| D.N.C. Farms Ltd | Agriculture & fishing | 2010 |
| D.O Pyramis Ltd | Transport & logistics | 2017 |
| D.O. Electrical Ltd. | Construction | 2014 |
| D.P.S. Sign & Screenprint Limited | Manufacturing | 2007 |
| D.R Motorsport Ltd | Arts & recreation | 2026 |
| D.R. Cole Demolition Limited | Construction | 2002 |
| D.R. Engineering Consultant Ltd | Professional & scientific | 2014 |
| D.Read Art and Clothing Ltd | Wholesale & retail | 2025 |
| D.S Engineering Anglia Limited | Professional & scientific | 2022 |
| D.S.R. Estates Limited | Households | 2013 |
| D.V.L.C Enterprise Limited | Transport & logistics | 2018 |
| D2AVA Ltd | Professional & scientific | 2014 |
| D7 GT Yarmouth Ltd | Construction | 2019 |
| DA Accounting Services Ltd | Professional & scientific | 2014 |
| DA Survey & Design Ltd | Construction | 2025 |
| DAB Brothers Limited | Transport & logistics | 2025 |
| DAB Building and Plastering Services Ltd | Construction | 2023 |
| DAB Training Ltd | Professional & scientific | 2010 |
| Dabies Properties Limited | Real estate | 2015 |
| Dacc Property Limited | Real estate | 2011 |
| Dace Homes Limited | Construction | 2008 |
| Dack Ltd | Administrative & support | 2020 |
| Dacre Commercial Properties Limited | Real estate | 2022 |
| Dacs Design and Print Consultancy Limited | Professional & scientific | 2009 |
| Daddy K Life Coaching Limited | Arts & recreation | 2025 |
| Dadwal Haulage Ltd | Transport & logistics | 2011 |
| Daffodil Catering Ltd | Hospitality | 2020 |
| Dahoof Holdings Limited | Financial services | 2021 |
| Dahoof Investments Ltd | Construction | 2021 |
| Dahoof Lettings Limited | Real estate | 2021 |
| Dainec Solutions Limited | Information & communication | 2012 |
| Daintys Kitchen Ltd | Hospitality | 2021 |
| Dairy Farm Barns Management Company Limited | Real estate | 2020 |
| Daisy Cat Properties Ltd | Real estate | 2019 |
| Daitek Limited | Information & communication | 2024 |
| DAJ Baker Electrical Limited | Construction | 2013 |
| DAK Plant Training Ltd | Construction | 2019 |
| Dakers Drinks Limited | Hospitality | 2017 |
| Dalchini Restaurant & Takeaway Limited | Hospitality | 2015 |
| Dale Phillips Limited | Construction | 2018 |
| Dalf Energy Solutions Ltd | Wholesale & retail | 2019 |
| Daly Roofing Services Ltd | Construction | 2026 |
| Dalziel Property Ltd | Real estate | 2024 |
| DAM Green Services Limited | Construction | 2003 |
| DAM Properties (Norfolk) Ltd | Real estate | 2018 |
| Damico Engines Limited | Wholesale & retail | 2011 |
| Damien Pearl Consultancy Services Ltd | Professional & scientific | 2016 |
| Dammi Instructor Ltd | Education | 2025 |
| Damn & Blast Creative Limited | Professional & scientific | 2013 |
| DAN & Cameron PVT Ltd | Health & social care | 2025 |