| Motorfly Ltd | Wholesale & retail | 2019 |
| Motorway Windscreens Limited | Wholesale & retail | 2009 |
| Moulded Fibre Products Limited | Manufacturing | 2012 |
| Move With Madeleine Ltd | Other services | 2025 |
| Movedigital Ltd | Administrative & support | 2012 |
| Movement and Neuromodulation Limited | Health & social care | 2023 |
| Mozaik Nailz Limited | Health & social care | 2019 |
| MP Plant Services Ltd | Manufacturing | 2025 |
| Mp-Trans (INT) Ltd | Transport & logistics | 2024 |
| MPA Aviation Ltd | Professional & scientific | 2025 |
| MPL Transport Ltd | Transport & logistics | 2014 |
| MPO Global Trade UK Limited | Wholesale & retail | 2017 |
| MR Barber One Ltd | Other services | 2025 |
| MR S Riley Cat-Services Ltd | Manufacturing | 2023 |
| MR Therm Boilers for Life Ltd | Construction | 2018 |
| MR Therm Limited | Other services | 1994 |
| MR Wolf Recovery Limited | Transport & logistics | 2024 |
| MR. Therm (Servicecare) Limited | Construction | 1997 |
| Mrbarberscunthorpe Ltd | Other services | 2024 |
| MRS Driver Services Ltd | Transport & logistics | 2023 |
| Mrsafety Limited | Public administration | 2026 |
| MS Mammas Ltd | Hospitality | 2023 |
| MS Mandé Ltd | Manufacturing | 2023 |
| MS Motors Group Limited | Wholesale & retail | 2024 |
| MSB Trans Ltd | Transport & logistics | 2022 |
| MSK Radiology Services Ltd | Health & social care | 2020 |
| MSM Vehicle Refinishers Limited | Manufacturing | 2002 |
| MSU Transport Ltd | Transport & logistics | 2019 |
| Mtgb Limited | Real estate | 2023 |
| MTM Support Services Ltd | Administrative & support | 2025 |
| MU15 Ltd | Hospitality | 2018 |
| Mudavanhu Thamoly Ltd | Health & social care | 2026 |
| Muddy Boot Productions Limited | Information & communication | 2009 |
| Mulberry Healthcare Ltd | Health & social care | 2016 |
| Mulligans Sports Bar Limited | Hospitality | 2015 |
| Multi-Culti Foods Ltd | Wholesale & retail | 2021 |
| Multon Process Technology Limited | Information & communication | 1967 |
| Mumby Haulage Limited | Transport & logistics | 2013 |
| Murray Engineering Systems Ltd | Professional & scientific | 2024 |
| Murray Properties (Scunthorpe) Limited | Real estate | 2024 |
| Mursalin Group Ltd | Wholesale & retail | 2026 |
| Musan Ltd | Financial services | 2023 |
| Mushey Ltd | Wholesale & retail | 2024 |
| Muzaffar Group Ltd | Construction | 2023 |
| MVC Transport Limited | Transport & logistics | 2019 |
| MW Virtual Solutions Limited | Wholesale & retail | 2020 |
| MW Walas Ltd | Professional & scientific | 2015 |
| My Way Property Services Limited | Construction | 2020 |
| Myra Phaselis Ltd | Wholesale & retail | 2024 |
| Mystic Partners & Co Ltd | Wholesale & retail | 2025 |
| Myvoc Ltd | Information & communication | 2023 |
| MZU Logistics Ltd | Transport & logistics | 2024 |
| N Atkin Transport Limited | Transport & logistics | 2025 |
| N IJ Properties Ltd | Real estate | 2022 |
| NAB Colours and Dispersions Limited | Manufacturing | 2004 |
| Nabia Limited | Real estate | 2018 |
| Nadiazaman Properties Ltd | Real estate | 2024 |
| Nadina Transport Limited | Transport & logistics | 2026 |
| Nagomi Health Limited | Health & social care | 2025 |
| Naicul Construct Limited | Construction | 2025 |
| Nailegant Ltd | Other services | 2026 |
| Nandhara Limited | Professional & scientific | 2010 |
| Napet Limited | Professional & scientific | 2025 |
| Naquadria Services Limited | Administrative & support | 2008 |
| NAS Create Ltd | Information & communication | 2026 |
| Natalia Luca Ltd | Transport & logistics | 2025 |
| Natalie Forshaw Limited | Health & social care | 2025 |
| Natasha Hall Mortgages Ltd | Financial services | 2026 |
| Nathaniels Jeweller & Goldsmith Limited | Wholesale & retail | 2017 |
| National Association of Designated Safeguarding Leads Limited | Other services | 2020 |
| National Renewable Energy Solutions Ltd | Energy | 2025 |
| National Road Freight Limited | Financial services | 2025 |
| Nationwide Kitchen Installations Holdings Limited | Professional & scientific | 2018 |
| Nationwide Property Rentals Limited | Real estate | 2016 |
| Nattom Properties Limited | Real estate | 2025 |
| Natural Paving Limited | Wholesale & retail | 2014 |
| Natural Paving Products (UK) Ltd | Wholesale & retail | 2016 |
| Naturally Grown Food Limited | Transport & logistics | 2008 |
| Nature's Way Farm Ltd | Agriculture & fishing | 2026 |
| Navarro Medical Limited | Health & social care | 2022 |
| Naztudor & Co Ltd | Real estate | 2020 |
| NB Plumbing, Heating and Property Maintenance Limited | Construction | 2026 |
| NB Properties (Scunthorpe) Ltd | Real estate | 2024 |
| Nc-Mcg Trans Ltd | Transport & logistics | 2025 |
| Ncef Medical Solutions Ltd | Health & social care | 2023 |
| NCS Buildings Ltd | Real estate | 2026 |
| NE Rydz UK Ltd | Arts & recreation | 2024 |
| Neesh@ Ltd | Hospitality | 2025 |
| Neil Murray Motors Limited | Wholesale & retail | 2018 |
| Neil Vessey (Storage Tanks) Limited | Manufacturing | 1977 |
| Neowolf Ltd | Administrative & support | 2014 |
| Nessband Ellis Limited | Manufacturing | 2002 |
| Netbids Auction Ltd | Wholesale & retail | 2019 |
| Netsrik Services Limited | Information & communication | 2020 |
| Neuroxphere Limited | Health & social care | 2023 |
| Neva Rentals Ltd | Real estate | 2025 |
| New Beginnings Personal Training and Wellness Facility Ltd | Arts & recreation | 2024 |
| New Century Foods Limited | Manufacturing | 2001 |
| New County Glazing Limited | Construction | 2002 |
| New Life (Scunthorpe) | Health & social care | 2006 |