| Mostly Property Limited | Real estate | 1998 |
| Motivethird Limited | Construction | 1988 |
| Motor Agents 4 U Ltd | Wholesale & retail | 2024 |
| Motus Design Solutions Ltd | Manufacturing | 2016 |
| Mountford Court Management Company Limited | Households | 2025 |
| Mouse & Bear Holdings Ltd | Information & communication | 2019 |
| Mouse & Bear Management Limited | Wholesale & retail | 2024 |
| Mouse & Bear Projects Limited | Other services | 2020 |
| Mouse & Bear Solutions Ltd | Information & communication | 2015 |
| MP & KM Golding Limited | Construction | 2009 |
| MPR Consultancy Limited | Information & communication | 2025 |
| MR and SJ Batkin Ltd | Education | 2023 |
| MRS Huang Limited | Hospitality | 2024 |
| MRW Plumbing & Heating Services Ltd | Construction | 2012 |
| MSB Luxury Stays Ltd | Hospitality | 2024 |
| MTK African Gourmet Ltd | Wholesale & retail | 2026 |
| MTS Electrician Ltd | Manufacturing | 2024 |
| Mucha Properties Limited | Real estate | 2026 |
| MUJTABA92120 Ltd | Health & social care | 2026 |
| Musausama Ltd | Wholesale & retail | 2025 |
| Musharaf IT Services Limited | Information & communication | 2024 |
| MWB Asset Management Limited | Construction | 2021 |
| MWB Investments | Financial services | 2020 |
| My Athoor London Ltd | Wholesale & retail | 2025 |
| My Building Work Ltd | Construction | 2023 |
| My Day Care Services Ltd | Health & social care | 2014 |
| My Neighbours the Dumplings Limited | Hospitality | 2014 |
| My Safety Ltd | Professional & scientific | 2024 |
| Myfusioncare Ltd | Administrative & support | 2024 |
| Mymr Ltd | Wholesale & retail | 2021 |
| Myn-Yani Company Ltd | Health & social care | 2021 |
| N & G Groundworks Ltd | Construction | 2021 |
| N & T Associates Limited | Information & communication | 2010 |
| N S W Enterprises Limited | Real estate | 2018 |
| N-E Performance Ltd | Arts & recreation | 2025 |
| N. a. B. Catering Limited | Hospitality | 2019 |
| Nails and Beauty Yeovil Ltd | Other services | 2025 |
| NAK HNC Ltd | Construction | 2026 |
| Nash Consultancy (Wessex) Ltd | Administrative & support | 2008 |
| Nash Investments (Wessex) Limited | Real estate | 2018 |
| Natalie RAE Consultancy Ltd | Education | 2023 |
| NB Totoro Limited | Extraterritorial | 2020 |
| NE Coffee Ltd | Hospitality | 2026 |
| Neagu HC Ltd | Health & social care | 2018 |
| Neave & Co Wealth Limited | Professional & scientific | 2014 |
| Nectanebo Estates Ltd | Real estate | 2014 |
| Needelm Limited | Professional & scientific | 1984 |
| NEF Cleaning Ltd | Administrative & support | 2014 |
| Nest and Venture Ltd | Wholesale & retail | 2025 |
| Nest in Bath Ltd | Households | 2020 |
| Network Digitel Limited | Information & communication | 2003 |
| Neuroverify Group Ltd | Health & social care | 2026 |
| New Drove Developments Ltd. | Construction | 2015 |
| New Inn Farm (Halstock) Limited | Agriculture & fishing | 2025 |
| New Somerset Nails Ltd | Other services | 2025 |
| New Timeline Ltd | Wholesale & retail | 2025 |
| Newman Building Solutions Limited | Construction | 2011 |
| Newton Management and Development Ltd | Construction | 2023 |
| Newtool Limited | Extraterritorial | 2012 |
| Next Level Carpentry & Joinery Ltd | Manufacturing | 2026 |
| Next Level Couriers Ltd | Transport & logistics | 2025 |
| Next Level HR Consultancy Ltd | Administrative & support | 2024 |
| Nhance Consulting Ltd | Professional & scientific | 2022 |
| Nice Package Ltd | Administrative & support | 2015 |
| Nicee 'N' Tasty Limited | Hospitality | 2022 |
| Nicholson Hine Associates Limited | Professional & scientific | 2017 |
| Nick Reed Construction Ltd | Construction | 2005 |
| Nicola Boyes Transport Ltd | Transport & logistics | 2019 |
| Nigel Moysey Limited | Professional & scientific | 2019 |
| Nigel Riggs Plumbing & Heating Limited | Construction | 2003 |
| Night & Day Deliveries Ltd | Administrative & support | 2015 |
| Nine Springs Natural Health Clinic Limited | Health & social care | 2019 |
| Nivil Lonakutty Photography & Tech Services Ltd | Transport & logistics | 2020 |
| Nkha Ltd | Wholesale & retail | 2024 |
| NO House Limited | Financial services | 1996 |
| NO Ordinary Labels Limited | Extraterritorial | 2024 |
| No-Vertigo Group Ltd | Administrative & support | 2013 |
| NO5 Catering Ltd | Hospitality | 2011 |
| Noakeswood Properties Limited | Hospitality | 1999 |
| Noel Assets Limited | Construction | 2012 |
| Nonterus Estates Limited | Real estate | 1973 |
| Noodle Creative Studios Limited | Information & communication | 2024 |
| Nordic Communications Limited | Information & communication | 2017 |
| Norris Body Repairs Ltd | Wholesale & retail | 2013 |
| North Cadbury Village Stores Ltd | Wholesale & retail | 2015 |
| North Leaze Enterprises Limited | Extraterritorial | 1954 |
| North Leaze Farm Limited | Agriculture & fishing | 2009 |
| North Sales Ltd | Real estate | 2022 |
| North Town Consulting Limited | Professional & scientific | 2012 |
| Northseam Limited | Professional & scientific | 2016 |
| NOT Just Accountants Limited | Professional & scientific | 2016 |
| NPB Utilities Limited | Construction | 2011 |
| NRG Cooling Ltd | Manufacturing | 2019 |
| NRJ Cars Ltd | Wholesale & retail | 2018 |
| NS Autos Limited | Wholesale & retail | 2016 |
| NSL (SW) Limited | Administrative & support | 2020 |
| NSL (Wessex) Limited | Administrative & support | 2022 |
| NSM Plumbing Limited | Construction | 2013 |
| Nuebe Med-Trans Solutions Ltd | Transport & logistics | 2026 |
| Nuovo Italia Ltd | Hospitality | 2014 |