| Mundys Financial Services Limited | Financial services | 2023 |
| Mundys Property Services LLP | | 2010 |
| Munro Property Contractors Ltd | Construction | 2025 |
| Muntasser Medical Ltd | Health & social care | 2022 |
| Murphy's Utilities and Civils Ltd | Construction | 2019 |
| Murphy-Lee UK Limited | Manufacturing | 2018 |
| Mushroom Mortgages Ltd | Financial services | 2023 |
| Muskham Commercial Limited | Wholesale & retail | 2015 |
| Muskin by K Limited | Wholesale & retail | 2025 |
| Mussons Heating Limited | Construction | 2007 |
| MV90 Limited | Other services | 2018 |
| Mverse Limited | Information & communication | 2026 |
| Mvmt Club Ltd | Health & social care | 2024 |
| MW 3D Ltd | Administrative & support | 2017 |
| MW Systems Lincoln Ltd | Administrative & support | 2025 |
| MW Team (UK) Ltd | Transport & logistics | 2015 |
| Mwdt Transport Solutions Ltd | Transport & logistics | 2013 |
| MWP Freehold Limited | Real estate | 2024 |
| MWP Lettings Limited | Real estate | 2024 |
| MWT Automotive Services Ltd | Wholesale & retail | 2007 |
| My DNA Legacy Limited | Professional & scientific | 2017 |
| My Electric Vehicle Limited | Administrative & support | 2021 |
| My Head Space Ltd | Health & social care | 2016 |
| My Helpers Group Limited | Administrative & support | 2024 |
| My Next Vehicle Pro Lincoln Limited | Wholesale & retail | 2025 |
| My Square Management Limited | Administrative & support | 2022 |
| My Square Metre Limited | Other services | 2021 |
| My Student Essentials Ltd | Wholesale & retail | 2013 |
| My Team Accounting Limited | Professional & scientific | 2020 |
| My Thunder Properties Ltd | Real estate | 2025 |
| Mybirdy Limited | Information & communication | 2019 |
| Myco Mart Ltd | Agriculture & fishing | 2025 |
| Mydeliverypro Limited | Transport & logistics | 2020 |
| Myfactory IDC Ltd | Information & communication | 2007 |
| Mynextvehiclepro Limited | Wholesale & retail | 2021 |
| Myre Nexus Limited | Wholesale & retail | 2026 |
| Myxool CIC | Education | 2025 |
| MZM Hand Car Wash Ltd | Administrative & support | 2022 |
| N & V Trowbridge Financial Planning Ltd | Financial services | 2018 |
| N a E Consulting Limited | Professional & scientific | 2012 |
| N Betley Drylining Limited | Construction | 2023 |
| N C Engineering Consultants Ltd | Professional & scientific | 2006 |
| N Clabbon Limited | Real estate | 1995 |
| N Evans Driver Services Ltd | Transport & logistics | 2011 |
| N H Carpets & Flooring Ltd | Wholesale & retail | 2023 |
| N J Van AS Ltd | Health & social care | 2010 |
| N Jones Builder and Contractor Limited | Construction | 2007 |
| N M & J Limited | Professional & scientific | 2016 |
| N Pave Ltd | Construction | 2025 |
| N R Commercial Repairs Ltd | Wholesale & retail | 2022 |
| N S Driver Ltd | Transport & logistics | 2025 |
| N Shaw Grab Hire Ltd | Transport & logistics | 2020 |
| N&E Motor Services Limited | Wholesale & retail | 2013 |
| N&P Classics Ltd | Wholesale & retail | 2025 |
| N-L (Thirsk) Venture Limited | Construction | 2023 |
| N. & L. Lusby Properties Ltd | Real estate | 2022 |
| N. Chapman Plastering Limited | Construction | 2004 |
| N.D.J. Limited | Construction | 2012 |
| Nailed IT! by Chelsey Ltd | Arts & recreation | 2025 |
| Nakko Transport Ltd | Transport & logistics | 2017 |
| NAM JAI Thai Spa Limited | Other services | 2026 |
| Namron Afro Heritage Club Ltd | Hospitality | 2025 |
| Namron Healthcare Ltd | Health & social care | 2026 |
| Namron House Ltd | Health & social care | 2018 |
| Nanban Foods Ltd | Hospitality | 2022 |
| Nanban Ltd | Wholesale & retail | 2020 |
| Nanban Properties Ltd | Real estate | 2022 |
| Nanny's (Sleaford) Ltd | Hospitality | 2019 |
| Nanoferts Limited | Wholesale & retail | 2022 |
| Naochiiiltd Limited | Administrative & support | 2025 |
| Naomi Daubney Limited | Extraterritorial | 2004 |
| Narang Corp Limited | Wholesale & retail | 2025 |
| Nash Healthcare Services Ltd | Health & social care | 2019 |
| Natalie Hewitt Events Ltd | Administrative & support | 2022 |
| Natasa Store Ltd | Wholesale & retail | 2021 |
| Nathan Clare Consultants Limited | Information & communication | 2008 |
| Nathan Poundall Lighting Limited | Professional & scientific | 2019 |
| National Centre for Rural Health and Care Community Interest Company | Health & social care | 2017 |
| National Road Marking Ltd | Construction | 2018 |
| Nationwide Passive Fire Solutions Ltd | Extraterritorial | 2024 |
| Natomar Homes Lincoln Ltd | Construction | 2023 |
| Natomar Homes Ltd | Construction | 2020 |
| Natural Bliss Ltd | Extraterritorial | 2022 |
| Natural Riverscapes Ltd | Professional & scientific | 2026 |
| Natural Stone & Brickwork Ltd | Construction | 2015 |
| Naturama Limited | Manufacturing | 2023 |
| Nature Avenue Ltd | Manufacturing | 2022 |
| Nautexa Maritime Services Ltd | Wholesale & retail | 2025 |
| Nave Plumbing & Heating Ltd | Construction | 2021 |
| Navenby Butchers Limited | Wholesale & retail | 2024 |
| Navenby Station Storage Ltd | Transport & logistics | 2023 |
| Navenby Stove Maintenance Ltd | Administrative & support | 2023 |
| Navenby Stoves Ltd | Construction | 2024 |
| Naverlode Limited | Agriculture & fishing | 1996 |
| NAZ Builders and Property Development Ltd | Construction | 2025 |
| NB Electrical (Lincs) Limited | Construction | 2024 |
| NB Professional Cleaning Services Ltd | Real estate | 2023 |
| Nbms Properties Ltd | Real estate | 2026 |
| NC Groundworks and Civils Limited | Construction | 2022 |
| Ncck Medicals Limited | Health & social care | 2022 |