| Lucrative Ventures Ltd | Administrative & support | 2014 |
| Luna Care (Edwinstowe) Ltd | Professional & scientific | 2019 |
| Lunghealth Limited | Health & social care | 2007 |
| Lupin and Turner Ltd | Hospitality | 2021 |
| M & M Roofing (EA) Ltd | Construction | 2023 |
| M and SS Properties Limited | Real estate | 2013 |
| M Jary Limited | Transport & logistics | 2012 |
| Mackenzie House Ltd | Real estate | 2024 |
| Maclennan Wealth Management Ltd | Financial services | 2019 |
| Maison Privée Ltd | Professional & scientific | 2020 |
| Making Marks Limited | Arts & recreation | 2005 |
| Malby Construction Services Ltd | Construction | 2013 |
| Malthouse Croft (Beachamwell) Management Company Limited | Real estate | 2002 |
| Mapus - Smith & Minns Limited | Extraterritorial | 2003 |
| Marcopolo Professional Solutions Limited | Administrative & support | 2025 |
| Mark Nicholls Media Limited | Information & communication | 2012 |
| Marsh PIG Ltd | Manufacturing | 2021 |
| MARSH89 Associates Limited | Administrative & support | 2025 |
| Martin Childs Limited | Manufacturing | 1999 |
| Martins Properties Ltd | Real estate | 2014 |
| Matt Consultants Ltd | Manufacturing | 2021 |
| MAY Hospitality Limited | Hospitality | 2026 |
| Mazal 77 Limited | Extraterritorial | 2015 |
| MC3 Construction Limited | Construction | 2014 |
| Mcausbyrne Tools Limited | Manufacturing | 1978 |
| Mccurry Developments Limited | Construction | 2012 |
| Mcgee Butler Limited | Real estate | 2019 |
| Mclatchie Insulations Limited | Administrative & support | 2007 |
| Mech-Elec Wholesale Limited | Wholesale & retail | 2020 |
| Medlock Designs Limited | Professional & scientific | 2019 |
| Merit Advantage Ltd | Professional & scientific | 2023 |
| Merit Inspection Solutions Ltd | Professional & scientific | 2015 |
| Meritagcheck Ltd | Extraterritorial | 2020 |
| Meritcheck Ltd | Information & communication | 2020 |
| Meritnaturecheck Ltd | Professional & scientific | 2021 |
| Mesh CMS Limited | Construction | 2020 |
| MGH Business Services Ltd | Professional & scientific | 2011 |
| Micro Business Team Ltd | Professional & scientific | 2012 |
| Midas Car Company Limited | Manufacturing | 2024 |
| Midas Film Car Company Ltd | Manufacturing | 2024 |
| Mija Survey Ltd | Construction | 2014 |
| Millfields Conveyor Belting Limited | Manufacturing | 2008 |
| Millington Enterprises Limited | Information & communication | 2021 |
| Milners Made in Manchester Ltd | Hospitality | 2024 |
| Mirhall Ltd | Real estate | 2018 |
| MJL Consult Global Ltd | Professional & scientific | 2025 |
| MJL Ices Limited | Manufacturing | 2016 |
| MLS Contracting Limited | Professional & scientific | 2023 |
| Moidart Consultancy Limited | Professional & scientific | 2009 |
| Montgomery Homes Limited | Construction | 2013 |
| Moonlight Dental Surgeries Limited | Health & social care | 2008 |
| Moulton Electrical Services Limited | Administrative & support | 2016 |
| MP Plant (E.Anglia) Limited | Administrative & support | 2010 |
| MP Training Solutions Limited | Education | 2019 |
| MR. Bright's Limited | Administrative & support | 2003 |
| MSM Accountants Limited | Professional & scientific | 2001 |
| MSS Swaffham Limited | Wholesale & retail | 2015 |
| Mundfords Limited | Wholesale & retail | 2012 |
| Music for People (Summer School of Music) | Education | 2007 |
| Mussay Limited | Manufacturing | 2015 |
| Mutleys Ltd | Wholesale & retail | 2010 |
| Mwecs Ltd | Professional & scientific | 2024 |
| NA Johnson Limited | Wholesale & retail | 2016 |
| NAE62 Limited | Administrative & support | 2019 |
| Nails 68 Ltd | Other services | 2024 |
| NAR Valley Pigs Limited | Agriculture & fishing | 2019 |
| Narford Holdings Limited | Financial services | 2016 |
| Narford Scaffolding Limited | Construction | 2009 |
| Natures Natural Power Ltd | Manufacturing | 2020 |
| Naturevito Limited | Manufacturing | 2008 |
| Naturewebservices Limited | Administrative & support | 2022 |
| Necton Butchers Limited | Wholesale & retail | 2009 |
| Necton Management Limited | Construction | 1968 |
| Nelson House Management Company Limited | Hospitality | 2009 |
| Nelson’S Nest Cafe Ltd | Hospitality | 2024 |
| Neon Fish Software Limited | Information & communication | 2013 |
| NET Norfolk Limited | Wholesale & retail | 2026 |
| Network Consolidation & Infrastructure Services Limited | Information & communication | 2002 |
| Neuronbld UK Limited | Administrative & support | 2023 |
| Neuronbuild Corporation Limited | Administrative & support | 2023 |
| Neuronbuild Limited | Administrative & support | 2023 |
| New Norfolk Roofing Limited | Construction | 2014 |
| New Performance Health Limited | Health & social care | 2026 |
| Newmarket Farm Limited | Arts & recreation | 2015 |
| Newspace Solutions Limited | Construction | 2013 |
| NGR Carpentry and Bespoke Joinery Ltd | Manufacturing | 2025 |
| NGR Construction Limited | Construction | 2022 |
| NGR Estates Ltd | Real estate | 2024 |
| Nion Holdings Ltd | Construction | 2024 |
| Nitro Stuntman to the Stars Ltd | Information & communication | 2026 |
| Nitrobooks.Com Limited | Information & communication | 2026 |
| Norfolk Automotive Ltd | Wholesale & retail | 2021 |
| Norfolk Barber Ltd | Other services | 2025 |
| Norfolk Bay Company Ltd | Wholesale & retail | 2021 |
| Norfolk Building Services Limited | Construction | 2022 |
| Norfolk Enviro Packaging Limited | Wholesale & retail | 2022 |
| Norfolk Flat Roofing Limited | Construction | 2019 |
| Norfolk Involve Ltd | Education | 2024 |
| Norfolk Landscapes Limited | Administrative & support | 1999 |
| Norfolk Lettings Ltd | Real estate | 2012 |