| Mwave Group Ltd | Financial services | 2026 |
| Mwjb Limited | Information & communication | 2013 |
| Mwojcik Ltd | Health & social care | 2019 |
| MWP Projects Ltd | Construction | 2019 |
| My Business Accountant Ltd | Professional & scientific | 2013 |
| My Business Payroll Limited | Extraterritorial | 2026 |
| My Continuum Wealth Limited | Financial services | 2018 |
| My Garden Fencing Limited | Construction | 2025 |
| My Grassroots Ltd | Education | 2025 |
| My Life My Future C.I.C. | Education | 2023 |
| My Purpose Ltd | Arts & recreation | 2003 |
| My Tax Accountant Limited | Professional & scientific | 2010 |
| My Triumph Limited | Financial services | 2021 |
| My Trusty Tails Ltd | Other services | 2025 |
| My Wacky Forest Ltd | Information & communication | 2022 |
| My.Klt Ltd. | Information & communication | 2014 |
| Myam Estates Limited | Financial services | 2024 |
| Mybespoke Ltd | Manufacturing | 2019 |
| Mycroft Services (South West) Ltd | Real estate | 2003 |
| Myhive Services Ltd | Information & communication | 2004 |
| MYK Holdings Limited | Administrative & support | 2008 |
| Mykreative Limited | Other services | 2011 |
| Mylacares Limited | Health & social care | 2023 |
| Mylesahead Ltd | Administrative & support | 2011 |
| Myriad Minds Therapy Practice Limited | Health & social care | 2022 |
| MYS (Holdings) Limited | Financial services | 2017 |
| Mystic Aura Events Ltd | Other services | 2019 |
| Mystic Pizza Takeaway Ltd | Hospitality | 2020 |
| Mystream Limited | Information & communication | 2007 |
| Mytril Ltd | Construction | 2014 |
| MZ Interiors Ltd | Construction | 2019 |
| MZR Enterprise Ltd | Hospitality | 2024 |
| N and R Properties (Devon) Limited | Construction | 2015 |
| N D Consulting Ltd | Professional & scientific | 2026 |
| N D Looe Ltd | Hospitality | 2025 |
| N P Williams Limited | Professional & scientific | 2012 |
| N&S Consultancy Limited | Financial services | 2023 |
| N. Ross Construction Ltd | Construction | 2015 |
| N.B.D. Limited | Professional & scientific | 1996 |
| N.Dusky (SW) Ltd | Hospitality | 2026 |
| N.Dusky Ltd | Hospitality | 2025 |
| N9 Design Limited | Administrative & support | 2008 |
| NA Wspolnej Ltd | Wholesale & retail | 2017 |
| Nabc Network (UK) Limited | Other services | 2016 |
| Nace Environmental Ltd | Wholesale & retail | 2019 |
| Naddafe Limited | Construction | 2003 |
| Nadia K Academy Community Interest Company | Education | 2022 |
| Naija Express Limited | Hospitality | 2025 |
| Nail Tech Network Limited | Other services | 2018 |
| Nails for YOU PL1 Ltd | Other services | 2023 |
| NAJ Care Consultancy Ltd | Administrative & support | 2020 |
| Nakara Limited | Information & communication | 2013 |
| Naked Heat Ltd | Construction | 2020 |
| Naloxone Advocates Plymouth Community Interest Company | Health & social care | 2025 |
| Nalumba and Co Services Ltd | Health & social care | 2025 |
| Nams Food Ltd | Hospitality | 2021 |
| NAMS.FOOD1 Ltd | Hospitality | 2023 |
| Nanosun Solar Ltd | Professional & scientific | 2023 |
| Naomi Issitt Property Ltd | Real estate | 2018 |
| Napier House (Plymouth) Residents Limited | Households | 2004 |
| Napton Independent Advisory Services Ltd | Professional & scientific | 2026 |
| Narsus Limited | Construction | 2015 |
| Naseeb (SW) Ltd | Hospitality | 2019 |
| Nash & Co Solicitors LLP | | 2007 |
| Nash Motors Plymouth Ltd | Wholesale & retail | 2024 |
| Nasos Ltd | Health & social care | 2009 |
| Nassitisan Holdings Ltd | Financial services | 2020 |
| Natalie's Dog Grooming Centre Limited | Other services | 2022 |
| Natasha Petrig Services Limited | Administrative & support | 2022 |
| Nathan and Stock Limited | Wholesale & retail | 2010 |
| Nathan Bone Yacht Repairs and Refits Limited | Other services | 2017 |
| National Aquarium Limited | Professional & scientific | 2000 |
| National Board for Hypnotherapy Ltd | Other services | 2020 |
| National Board for Modern Psychotherapy Limited | Other services | 2015 |
| National Centre for Marine Autonomy Ltd | Information & communication | 2025 |
| National Public Transport Information Limited | Transport & logistics | 2000 |
| Nationwide Air Conditioning & Heating Services Ltd | Professional & scientific | 2026 |
| Nationwide Association of Passive Fire Installers & Specifiers Ltd | Professional & scientific | 2013 |
| Nationwide Construction Specialists Ltd | Construction | 2020 |
| Nationwide Drainage Ltd | Construction | 2025 |
| Native 21 Ltd | Arts & recreation | 2020 |
| Natsilane Ltd | Agriculture & fishing | 2023 |
| Natural Health Plymouth Limited | Health & social care | 2017 |
| Natural Source Ltd | Wholesale & retail | 2026 |
| Naturally Cats Limited | Extraterritorial | 2021 |
| Naturally Gorgeous Cosmetics Ltd | Manufacturing | 2020 |
| Nature Nurture Nourish Ltd | Public administration | 2021 |
| Nature's Classroom Community Interest Company | Education | 2025 |
| Natures Best Kept Secret Ltd. | Wholesale & retail | 2023 |
| Naunet Ltd | Professional & scientific | 2015 |
| Naval Marine Engineering Consultancy Limited | Manufacturing | 2021 |
| Naveed Limited | Transport & logistics | 2018 |
| Navimaps Ltd | Professional & scientific | 2019 |
| Nawroz 21 Ltd | Hospitality | 2021 |
| Nawroz Desserts Limited | Wholesale & retail | 2024 |
| Nawroz Limited | Real estate | 2020 |
| Nawroz Market Ltd | Wholesale & retail | 2017 |
| NB & CB Holdings Ltd | Financial services | 2021 |
| NB Search and Selection Limited | Administrative & support | 2019 |
| Nb&Co. Ltd | Professional & scientific | 2019 |