| Moyes & Scott Limited | Financial services | 2013 |
| Moyle Ltd | Wholesale & retail | 2026 |
| Mozzie Cozzie Limited | Wholesale & retail | 2025 |
| Mo’S Peri Peri Ltd | Hospitality | 2022 |
| MP Bookkeeping Ltd | Professional & scientific | 2012 |
| MP Global Holdings Ltd | Wholesale & retail | 2025 |
| MP Hotels Limited | Hospitality | 2002 |
| MP Norwich Holdings Ltd | Extraterritorial | 2025 |
| MP Power Ltd | Professional & scientific | 2010 |
| MP Promoters Limited | Information & communication | 2008 |
| MP Sparks Electrical Services Ltd | Construction | 2021 |
| MPC Hotels Ltd | Hospitality | 2010 |
| MPC Invest Ltd | Administrative & support | 2010 |
| MPC Offshore Services Ltd | Administrative & support | 2013 |
| MPC Rejuvenate! CIC | Education | 2023 |
| Mpcs Group Limited | Hospitality | 1974 |
| Mpfusion Limited | Manufacturing | 2017 |
| MPH Auto Valeting Ltd | Administrative & support | 2024 |
| MPH Concrete Limited | Construction | 2022 |
| MPH Property Management Ltd | Real estate | 2009 |
| MPH Property Sales Limited | Real estate | 2021 |
| MPH Property Services Ltd | Construction | 2003 |
| Mphs Developments Limited | Real estate | 2014 |
| MPI Management Services Ltd | Financial services | 2020 |
| MPJ Property Ltd | Real estate | 2014 |
| MPT Healthcare Limited | Health & social care | 2021 |
| MR Barber Norwich Ltd | Other services | 2025 |
| MR Chimneysweep Limited | Other services | 2026 |
| MR Clark's Cleaning Ltd | Hospitality | 2016 |
| MR Cleanoven Ltd | Administrative & support | 2012 |
| MR Doner Cardiff Limited | Hospitality | 2019 |
| MR Drinks & Snacks Limited | Hospitality | 2007 |
| MR Flat Roofer Ltd | Construction | 2025 |
| MR Foam (Norwich) Ltd | Manufacturing | 2023 |
| MR Fruity (Wholesale) Limited | Wholesale & retail | 1993 |
| MR Fruity Holdings Limited | Financial services | 2017 |
| MR Macgregor's Garden Ltd | Agriculture & fishing | 2025 |
| MR Penny Mortgages and Protection Limited | Financial services | 2026 |
| MR Property MAN Limited | Real estate | 2024 |
| MR Ross IT Services Limited | Information & communication | 2010 |
| MR Safe Deck (Anglia) Limited | Construction | 2018 |
| MR Watch Winder Ltd | Wholesale & retail | 2024 |
| MRB Consultancy Ltd | Financial services | 2023 |
| MRB Norfolk Limited | Hospitality | 2025 |
| MRB Offshore Services Ltd | Other services | 2016 |
| MRD Advisory Ltd | Professional & scientific | 2025 |
| MRF Estate Ltd | Real estate | 2023 |
| MRI Geophysical Limited | Professional & scientific | 2018 |
| Mrin Intellect Limited | Information & communication | 2012 |
| Mrjcars Ltd | Transport & logistics | 2022 |
| MRL Medical Tourism Marketing and Consulting Ltd | Health & social care | 2021 |
| Mrmg Acquisitions Limited | Real estate | 2019 |
| Mrmg Ltd | Professional & scientific | 2016 |
| MRP Automotive Ltd | Wholesale & retail | 2021 |
| MRP Electrical Contractors Ltd | Construction | 2010 |
| MRS Interior Solutions Ltd | Construction | 2023 |
| MRS Penny Ltd | Professional & scientific | 2023 |
| MRS Recruitment Limited | Administrative & support | 2013 |
| MRU Engineering Limited | Manufacturing | 2026 |
| MRW Driving Solutions Limited | Transport & logistics | 2022 |
| MRW Programme Consulting Limited | Information & communication | 2023 |
| MS Barber Ltd | Other services | 2026 |
| MS Civils Services Ltd | Construction | 2024 |
| MS Cosmetics (UK) Ltd | Wholesale & retail | 2014 |
| MS on Ltd | Administrative & support | 2024 |
| MS Property Buxton Ltd | Real estate | 2025 |
| MS Therapy Centre, Norfolk Ltd | Health & social care | 2009 |
| MS1986 Consultancy Ltd | Professional & scientific | 2022 |
| MSA Foods Limited | Hospitality | 2022 |
| MSA Gift Limited | Wholesale & retail | 2022 |
| MSB Electrical (EA) Limited | Construction | 2023 |
| MSC Coatings Ltd | Construction | 2021 |
| MSC Digital Limited | Information & communication | 2016 |
| MSD Vascular Limited | Health & social care | 2019 |
| Msdb Enterprises UK Ltd | Hospitality | 2015 |
| MSF Water Solutions UK Limited | Water & waste | 2024 |
| MSH Consultants UK Ltd | Professional & scientific | 2019 |
| Msid Consulting Limited | Administrative & support | 2013 |
| MSJ Development Limited | Real estate | 2020 |
| MSK Consulting Services Ltd | Health & social care | 2019 |
| Msklb Group Limited | Administrative & support | 2020 |
| Msmart Ltd | Wholesale & retail | 2025 |
| MSN Telecoms Ltd | Information & communication | 2009 |
| MSP Logistics Limited | Transport & logistics | 2007 |
| MSP Staffing Limited | Administrative & support | 2021 |
| Mspfitness Ltd | Arts & recreation | 2017 |
| Mspipefitting Limited | Construction | 2014 |
| MSR Land & Property Ltd | Construction | 2026 |
| MSS Mortgages Limited | Financial services | 2020 |
| MST Productions Limited | Information & communication | 2022 |
| MSW Property Holdings Ltd | Real estate | 2024 |
| MT Comms Ltd | Information & communication | 2012 |
| MT EVE Records Limited | Information & communication | 2024 |
| MT Mobile Truck and Trailer Repairs Ltd | Wholesale & retail | 2016 |
| MT Photography Ltd | Professional & scientific | 2025 |
| MT Rentals Ltd | Real estate | 2016 |
| MT Restorations Ltd | Construction | 2021 |
| Mtab Limited | Wholesale & retail | 2024 |
| Mtapidoh Ltd | Health & social care | 2015 |
| MTB Property (Norfolk) Ltd | Real estate | 2026 |