| Morgan Props Ltd | Real estate | 2019 |
| Morganbeth Communications Limited | Information & communication | 1997 |
| Morgansales Ltd | Other services | 2019 |
| Morley Anaesthesia and Research Limited | Health & social care | 2009 |
| Morley Electric Motors Limited | Manufacturing | 2005 |
| Morley Electrical Engineering Company,Limited(The) | Manufacturing | 1897 |
| Morley Groundworks Ltd | Construction | 2025 |
| Morley's Management Solutions Ltd | Professional & scientific | 2025 |
| Morliny Foods Holding Limited | Financial services | 2021 |
| Morliny Foods Limited | Wholesale & retail | 1993 |
| Morning Flight Ltd | Financial services | 2023 |
| Morpheus Subsea Ltd | Professional & scientific | 2026 |
| Morphogenesis Limited | Professional & scientific | 2026 |
| Morray Limited | Administrative & support | 2016 |
| Morris Finance Ltd | Financial services | 2022 |
| Morris Lawn Care Ltd | Administrative & support | 2018 |
| Morro Strategic Accountants Limited | Professional & scientific | 2022 |
| Morston Assets Three (Holt) Limited | Real estate | 2009 |
| Morston Assets Three Limited | Real estate | 2009 |
| Morston Assets Two Limited | Real estate | 2008 |
| Morston Palatine Limited | Real estate | 2003 |
| Mortalis Manus Ltd | Manufacturing | 2025 |
| Mortgages Norfolk Limited | Financial services | 2020 |
| Mortola, Mortola & Pellegri Limited | Real estate | 2015 |
| Morton Hall Pigs Ltd | Agriculture & fishing | 2022 |
| Morton Properties (Norfolk) Limited | Professional & scientific | 2019 |
| Morton Reeves Ltd | Real estate | 2014 |
| Morton Water Limited | Other services | 2021 |
| Morton Windows & Conservatories Ltd | Manufacturing | 2004 |
| Morton's Event Hire Ltd | Administrative & support | 2016 |
| Morton's Traditional Taste Ltd | Agriculture & fishing | 1998 |
| Mosaic Digital Limited | Administrative & support | 2020 |
| Mosaic Spa and Health Club (Holmer Park) Limited | Arts & recreation | 2011 |
| Mosaic Spa and Health Club (Houghton Hall) Limited | Arts & recreation | 2012 |
| Mosaic Spa and Health Clubs (Contract Management) Limited | Arts & recreation | 2004 |
| Mosaic Spa and Health Clubs Limited | Arts & recreation | 2010 |
| Moss & Leakey Limited | Wholesale & retail | 2011 |
| Moss Cafe & Living Ltd | Financial services | 2026 |
| Moss Cafe Ltd | Hospitality | 2026 |
| Moss Hair and Beauty Limited | Other services | 2008 |
| Moss Hair Ltd | Other services | 2025 |
| Moss IT Consultancy Ltd | Information & communication | 2007 |
| Moss Living (Norfolk) Ltd | Wholesale & retail | 2026 |
| Moss Wood Limited | Arts & recreation | 2016 |
| Mossyartstudios Ltd | Wholesale & retail | 2024 |
| MOT Shop (Norfolk) Limited | Real estate | 2012 |
| Mother Home Properties Ltd | Real estate | 2025 |
| Mother's Cleaning Care Ltd | Administrative & support | 2025 |
| Motherland Produce Limited | Wholesale & retail | 2024 |
| Mothermouse Limited | Information & communication | 2005 |
| Moticron Media Ltd | Information & communication | 2025 |
| Motion Matters Ltd | Arts & recreation | 2017 |
| Motion Sustainable Laboratories Ltd | Professional & scientific | 2022 |
| Motivation HR Ltd | Administrative & support | 2011 |
| Motofly Limited | Administrative & support | 2007 |
| Motomagic Ltd | Wholesale & retail | 2006 |
| Motor Accountancy Plus Solutions Limited | Information & communication | 2009 |
| Motor Store Ltd | Wholesale & retail | 2013 |
| Motor Trade Jobs Limited | Professional & scientific | 2012 |
| Motor Trust Limited | Extraterritorial | 2023 |
| Motorbodies (Norfolk) Ltd | Wholesale & retail | 2011 |
| Motorhome and Caravan Care Limited | Wholesale & retail | 2025 |
| Motorpath Ltd | Wholesale & retail | 2025 |
| Motorvogue (Northampton) Limited | Wholesale & retail | 1997 |
| Motourapp Limited | Information & communication | 2012 |
| Mots @ 610.COM Limited | Wholesale & retail | 2015 |
| Motts Pharmacy Limited | Wholesale & retail | 2004 |
| Motts Property Holdings Limited | Real estate | 2023 |
| Motzab Limited | Real estate | 2007 |
| Mouche Ltd | Agriculture & fishing | 2019 |
| Moughton Limited | Real estate | 2016 |
| Moulson Property Portfolio Ltd | Real estate | 2024 |
| Moulton Barns Development Limited | Construction | 2018 |
| Moulton Windows Limited | Construction | 2011 |
| Mount Street Capital Partners Limited | Administrative & support | 2014 |
| Mountain Blewe Limited | Professional & scientific | 2016 |
| Mountain E&S Ltd | Other services | 2019 |
| Mountain Rooms Trading Limited | Administrative & support | 2022 |
| Mouse Trap Ltd | Hospitality | 2025 |
| Mousehold Estate Limited | Financial services | 1942 |
| Mousehold Farm Canteen Ltd | Hospitality | 2025 |
| Mousehold South Allotment Association CIC | Arts & recreation | 2022 |
| Mousehole Productions Ltd | Information & communication | 2006 |
| Mova Life Limited | Manufacturing | 2025 |
| Movac Coatings (Holdings) Limited | Wholesale & retail | 2022 |
| Move and LOG Limited | Professional & scientific | 2007 |
| Movement & Medicine Ltd | Health & social care | 2023 |
| Movement Connects C.I.C. | Education | 2023 |
| Moving Brands Group Limited | Administrative & support | 1999 |
| Moving Brands Limited | Administrative & support | 1998 |
| Moving Forward-Norfolk C.I.C. | Health & social care | 2021 |
| Movingo Ltd | Construction | 2025 |
| Movingonproperty Ltd | Real estate | 2025 |
| Mower Belts Direct Limited | Wholesale & retail | 2025 |
| Mowon Ltd | Manufacturing | 2022 |
| Moxi Health Ltd | Other services | 2019 |
| Moxie Creative Limited | Professional & scientific | 2015 |
| Moxley Garage Limited | Wholesale & retail | 2021 |
| Moxon Design Ltd | Professional & scientific | 2013 |
| Moya Bubble Tea Ltd | Hospitality | 2022 |