| Mraidanj Media Ltd | Information & communication | 2026 |
| MRR Infrastructure Limited | Professional & scientific | 2020 |
| MRS Sharief Healthcare Limited | Wholesale & retail | 2019 |
| MS Steering Ltd | Manufacturing | 2019 |
| MSM Civil Engineering Ltd | Professional & scientific | 2022 |
| Mstbell Limited | Real estate | 2024 |
| MT Electrical & A/C Services Limited | Energy | 2024 |
| MT Recovery Ltd | Transport & logistics | 2022 |
| MTC Logistics Ltd | Transport & logistics | 2025 |
| MTI Asset Management Ltd | Households | 2021 |
| Mullins Property Group Limited | Real estate | 2018 |
| Multi-Trade Property Services Ltd | Construction | 2018 |
| Multi-Trade PS Ltd | Construction | 2025 |
| Multimesh (UK) Ltd | Manufacturing | 2012 |
| Murphy Civils Ltd | Construction | 2021 |
| Murphy Landscaping Limited | Administrative & support | 2025 |
| Muruka PVT Limited | Wholesale & retail | 2023 |
| Music Stars Record Ltd | Information & communication | 2016 |
| Musicman Healthcare Solutions Ltd | Health & social care | 2026 |
| MVC PIC Limited | Financial services | 2023 |
| MVG Industries UK Ltd | Manufacturing | 2006 |
| MW Takeaway Ltd | Hospitality | 2024 |
| MWB Architecture Ltd | Professional & scientific | 2022 |
| MWB Design and Build Group Limited | Financial services | 2025 |
| MWB Residence Limited | Construction | 2011 |
| My Box Ltd | Wholesale & retail | 2025 |
| My Home Improvement Hub Ltd | Professional & scientific | 2023 |
| My Outdoor Classroom Community Interest Company | Education | 2012 |
| My Plasterers Ltd | Construction | 2025 |
| My Trees UK Ltd | Wholesale & retail | 2024 |
| Mygymgear Ltd | Extraterritorial | 2025 |
| Myhtos Studio Ltd | Manufacturing | 2026 |
| Myvally Ltd | Wholesale & retail | 2025 |
| N P Rooflines Ltd | Construction | 2018 |
| N W Insulation Ltd | Construction | 2026 |
| N&R Appetites Ltd | Hospitality | 2025 |
| N.A.B Utilities Ltd | Construction | 2025 |
| N.M.Valentine Ltd | Hospitality | 2020 |
| N.S. Properties (Northern) Limited | Manufacturing | 2020 |
| Nails by Krisztina Limited | Other services | 2024 |
| Namor Project Management Ltd | Professional & scientific | 2021 |
| National Skills Centre Ltd | Administrative & support | 2017 |
| Nationwide Performance Rentals and Services Ltd | Wholesale & retail | 2025 |
| Natural GAS Solutions (UK) Ltd | Manufacturing | 2018 |
| Nature Based Solutions (Global) Ltd | Wholesale & retail | 2021 |
| Naturopia Holistics Ltd | Health & social care | 2025 |
| Navigator Holdings Ltd | Real estate | 2022 |
| Navigator Logistics Ltd | Transport & logistics | 2021 |
| NB Extraction Ltd | Professional & scientific | 2023 |
| NC Weave Hair Extensions Ltd | Other services | 2023 |
| NCC Design Limited | Construction | 2018 |
| NDP Ventures Ltd | Other services | 2026 |
| Ndrentals Ltd | Real estate | 2024 |
| Nedhunter Ltd | Professional & scientific | 2025 |
| Neil Shaw Associates Ltd | Other services | 2018 |
| Ness Johnston Ltd | Administrative & support | 2017 |
| Nestco Ltd | Wholesale & retail | 2006 |
| Netstrad Limited | Information & communication | 2025 |
| Network Settle Cars Ltd | Transport & logistics | 2023 |
| New Direction Pathways CIC | Education | 2026 |
| New Golden FRY Ltd | Hospitality | 2022 |
| New Rollesby Gardens RTM Company Limited | Real estate | 2011 |
| New Shop St.Helens Ltd | Wholesale & retail | 2026 |
| New ST Helens Mini Market Ltd | Wholesale & retail | 2024 |
| Newbold Joinery Limited | Construction | 2018 |
| Newburn Haugh Power Limited | Energy | 2019 |
| News Wave Limited | Wholesale & retail | 2020 |
| Newton & Haydock PCN Limited | Health & social care | 2025 |
| Newton Decorating Co Ltd | Construction | 2023 |
| Newton Fitness Factory Ltd | Arts & recreation | 2021 |
| Newton Grill Ltd | Hospitality | 2022 |
| Newton Logistics of Haydock Ltd | Transport & logistics | 2025 |
| Newton Trade Supplies Ltd | Wholesale & retail | 2026 |
| Nexia Consulting Limited | Professional & scientific | 2026 |
| Next GEN Tiling Ltd | Construction | 2022 |
| Nextera Construction Ltd | Construction | 2026 |
| Nextgen Fintech Solutions Ltd | Financial services | 2025 |
| Nexus Choice Services Ltd | Information & communication | 2014 |
| NG Carpentry Limited | Construction | 2017 |
| NGF Europe Limited | Manufacturing | 1991 |
| Nicholas Transport Ltd | Transport & logistics | 2026 |
| Nicko Trading Ltd | Transport & logistics | 2014 |
| Nictel (UK) Limited | Manufacturing | 2014 |
| Nightshade Post Ltd | Information & communication | 2025 |
| Nikahee Ltd | Information & communication | 2026 |
| Nikol Ltd | Transport & logistics | 2015 |
| Nilerose Ltd | Health & social care | 2025 |
| Nine Arches Services Ltd | Administrative & support | 2023 |
| Nine Arches Training Ltd | Education | 2025 |
| NJ IT Solutions Ltd | Information & communication | 2021 |
| NJ Sales and Solutions Ltd | Wholesale & retail | 2024 |
| NK Roofline (NW) Limited | Construction | 2017 |
| NKE Limited | Wholesale & retail | 2019 |
| NKP Food and Wine Ltd | Wholesale & retail | 2025 |
| NLG Asbestos Solutions Ltd | Water & waste | 2024 |
| NLS Pubs & Bars Limited | Hospitality | 2025 |
| NMA North West Limited | Real estate | 2022 |
| NO Duff UK CIC | Education | 2019 |
| NO. 1 Care Logistics Ltd | Health & social care | 2024 |
| Nolla Group Limited | Water & waste | 2021 |