| MSP Clubs Limited | Education | 2017 |
| MSP Contract Services Limited | Administrative & support | 2007 |
| Msprecision (Grimsby) Ltd | Manufacturing | 2007 |
| MSW Trans Ltd | Transport & logistics | 2019 |
| MT Cosmetic Dent Ltd | Health & social care | 2026 |
| MTL (Fish Curers) Limited | Manufacturing | 2003 |
| MTS Engineering & Utilities Ltd | Administrative & support | 2010 |
| MTS Marine Management Ltd | Professional & scientific | 2024 |
| MU Consult Limited | Professional & scientific | 2022 |
| Mullaney Management Limited | Professional & scientific | 2012 |
| Mullvale Limited | Hospitality | 1998 |
| Mumford's Mill Management Limited | Extraterritorial | 2002 |
| Mumford's Mill Rentals Limited | Real estate | 2005 |
| Mumstore Limited | Wholesale & retail | 2007 |
| Mune Ventures Ltd | Health & social care | 2023 |
| Munro Hall Clinic Ltd | Health & social care | 2021 |
| Muraska Limited | Professional & scientific | 2020 |
| Murphys Logistics Limited | Transport & logistics | 2014 |
| Murphy’S Bar Limited | Hospitality | 2026 |
| Muscleflex Limited | Arts & recreation | 2018 |
| Mush Digital Ltd | Other services | 2016 |
| Mushroom Lane Property Management Limited | Households | 2017 |
| Mvandarko Ltd | Manufacturing | 2015 |
| MVC NO2 Ltd | Other services | 2019 |
| MVS Groundworks & Agri Services Ltd | Professional & scientific | 2016 |
| MW Seafoods Limited | Wholesale & retail | 2012 |
| MWB Motor Sports Limited | Administrative & support | 2015 |
| Mwcreatives Ltd | Arts & recreation | 2025 |
| Mwjw Properties Limited | Real estate | 2023 |
| MWM Engineering Services Limited | Professional & scientific | 2022 |
| MXS Holdings Ltd | Financial services | 2026 |
| My Barber Grimsby Ltd | Other services | 2024 |
| My Credit Controllers Ltd | Professional & scientific | 2013 |
| My Doggy Ltd | Wholesale & retail | 2023 |
| My Leisure Limited | Arts & recreation | 2014 |
| My Paint Mate Ltd | Construction | 2018 |
| Myad Limited | Professional & scientific | 2022 |
| Mybasks Limited | Wholesale & retail | 2019 |
| Mydon Consulting (Lincs) Ltd | Transport & logistics | 2022 |
| Myenergi GB Limited | Construction | 2023 |
| Myla HPT Limited | Construction | 2021 |
| Myles Shaw Limited | Professional & scientific | 2021 |
| Mylets Limited | Real estate | 2026 |
| Mymonies Ltd | Information & communication | 2026 |
| Myra Property Investments Ltd | Real estate | 2021 |
| Myst Furniture Limited | Wholesale & retail | 2021 |
| Myvip Ltd | Administrative & support | 2011 |
| Mzila Engineering Services Limited | Professional & scientific | 2025 |
| N & T C Systems Limited | Construction | 2010 |
| N C Haulage Ltd | Transport & logistics | 2018 |
| N D J Light Ltd. | Wholesale & retail | 2014 |
| N H Drain Services Limited | Administrative & support | 1999 |
| N Hutchinson Builders Limited | Construction | 2007 |
| N M Property Rentals Ltd | Real estate | 2024 |
| N Mawer Buildings Ltd | Construction | 2021 |
| N W Thompson Builders Limited | Construction | 2018 |
| N-Force Security Solutions Ltd | Administrative & support | 2010 |
| N-Tech Inspection Limited | Professional & scientific | 2013 |
| N.C. 342 Limited | Hospitality | 2025 |
| N.Carter ( Electrical Contractor) Ltd. | Construction | 2016 |
| N.M. Property & Leisure Limited | Hospitality | 2010 |
| N.P.C. Ventures Limited | Wholesale & retail | 2023 |
| N.Young Builders Ltd | Construction | 2013 |
| N4 Energy Solutions Limited | Administrative & support | 2022 |
| Naba Trade Limited | Hospitality | 2016 |
| Nabs Auto Ltd | Wholesale & retail | 2017 |
| Nailsbyjasmine Ltd | Other services | 2025 |
| NAM Renovation 80 Ltd | Manufacturing | 2025 |
| Nanny Junes, the Beauty Concept Store Ltd | Other services | 2021 |
| Napier Catering Engineering Ltd | Manufacturing | 2024 |
| Narew Transport Ltd | Wholesale & retail | 2018 |
| Nath Hemsley Roofing & Maintenance Ltd | Construction | 2020 |
| National Event Support Ltd | Arts & recreation | 2018 |
| Nationwide Painting Solutions Ltd | Construction | 2019 |
| Naturally Stacked Limited | Hospitality | 2025 |
| Natwood Limited | Professional & scientific | 2025 |
| Naughtybutnicecakes Ltd | Wholesale & retail | 2026 |
| Nautica Resourcing Limited | Administrative & support | 2017 |
| Navigo Cams Care UK Limited | Health & social care | 2015 |
| Navigo Extra Limited | Health & social care | 2014 |
| Navigo Health and Social Care CIC | Health & social care | 2010 |
| Navitron Limited | Wholesale & retail | 2004 |
| NB Offshore Management Services Ltd | Construction | 2023 |
| Nbjc Capital Limited | Real estate | 2025 |
| Nda&I Limited | Construction | 2025 |
| Ndicla Ltd | Other services | 2019 |
| Neela Properties Limited | Real estate | 2024 |
| Neeson Manor Fitness Limited | Arts & recreation | 2021 |
| Neeson Manor Properties Limited | Wholesale & retail | 2020 |
| Neil Graham PHG Ltd | Construction | 2023 |
| Neil Leeson Carpentry Ltd | Construction | 2017 |
| Nelfed Limited | Administrative & support | 2025 |
| Nelson Industrial Doors Limited | Construction | 2010 |
| Nemo Express Ltd | Transport & logistics | 2021 |
| Nenrtp Limited | Wholesale & retail | 2021 |
| NEO Innova Ltd | Transport & logistics | 2024 |
| Neptune Tyres Limited | Wholesale & retail | 2019 |
| Neri Health Limited | Health & social care | 2019 |
| Neri Properties Limited | Real estate | 2025 |
| Nerka Limited | Wholesale & retail | 2024 |