| Mum-Dance Ltd | Education | 2017 |
| Mum-Dance Partnerships Ltd | Education | 2020 |
| Mum-Dance UK Ltd | Arts & recreation | 2025 |
| Mums on the Run Home Help LLP | | 2019 |
| Mundi Limited | Information & communication | 2000 |
| Munns Marketing Limited | Professional & scientific | 2026 |
| Muppanda Ltd | Real estate | 2025 |
| Murhill Holdings Limited | Health & social care | 2018 |
| Murhillian Ltd | Professional & scientific | 2013 |
| Museum of Colour C.I.C. | Arts & recreation | 2020 |
| Music International Limited | Arts & recreation | 1989 |
| Music IS Life Limited | Arts & recreation | 1996 |
| Musiqueboutique Ltd | Professional & scientific | 2008 |
| Musmate Limited | Manufacturing | 2006 |
| Must Dash Ltd | Real estate | 2021 |
| Mustang Films Limited | Information & communication | 2018 |
| Mutu Accountancy Ltd | Professional & scientific | 2015 |
| MV Sales UK Ltd | Wholesale & retail | 2018 |
| MV Serv Limited | Health & social care | 2019 |
| MW AI Labs Ltd | Information & communication | 2025 |
| My Chiro Ltd | Health & social care | 2019 |
| My Five Ltd | Professional & scientific | 2016 |
| My Hotel Ryugu Limited | Hospitality | 2019 |
| My Mortgage Maker Ltd | Financial services | 2019 |
| My Patch Ltd | Agriculture & fishing | 2012 |
| My Removals and Storage Ltd | Transport & logistics | 2020 |
| My Small World Ltd | Wholesale & retail | 2010 |
| My Student Home Ltd | Real estate | 2021 |
| MYADV1CE Ltd | Professional & scientific | 2021 |
| MYC Lettings Ltd | Real estate | 2018 |
| Myclarityin Ltd | Information & communication | 2026 |
| Myga Retentions Limited | Financial services | 2026 |
| Mygirls Limited | Extraterritorial | 1985 |
| MYM Regenesis Limited | Real estate | 2022 |
| Myme Ltd | Information & communication | 2023 |
| Mymeets Ltd | Administrative & support | 2023 |
| Mynnas Limited | Professional & scientific | 2023 |
| MYO Rehabilitation Limited | Health & social care | 2025 |
| Mysa Heating Ltd | Construction | 2020 |
| Myslamb Limited | Extraterritorial | 2010 |
| Myth & Motion 3D Printing Limited | Information & communication | 2023 |
| Myton Automotive Limited | Wholesale & retail | 2013 |
| Mytton Williams Limited | Professional & scientific | 1996 |
| N & C Management Ltd | Hospitality | 2016 |
| N & S Roch Limited | Hospitality | 2006 |
| N & W Trading Limited | Hospitality | 2024 |
| N a Hucker Carpentry Limited | Construction | 2016 |
| N Bridge Store Limited | Wholesale & retail | 2026 |
| N C D Property Developments Limited | Financial services | 2002 |
| N H Formwork Limited | Construction | 2018 |
| N P Davie Consultancy Ltd | Professional & scientific | 2017 |
| N2UX Limited | Information & communication | 2011 |
| N4 Tech Ltd | Information & communication | 2022 |
| NA Gcopaleen Limited | Financial services | 2026 |
| Naere Ltd | Wholesale & retail | 2023 |
| Nahome Gooden Limited | Professional & scientific | 2016 |
| Nait Systems Ltd | Construction | 2017 |
| Najioo Limited | Manufacturing | 2025 |
| Nalewis Ltd | Professional & scientific | 2013 |
| NAM Limited | Wholesale & retail | 2017 |
| Namai Holiday Limited | Hospitality | 2023 |
| Nametab Logistics Limited | Information & communication | 2015 |
| Nanda Sustainable Properties Ltd | Real estate | 2020 |
| Naomi&Co Ltd | Health & social care | 2023 |
| Naou Limited | Hospitality | 2016 |
| Napule' Limited | Hospitality | 2023 |
| Narnarayan Properties Limited | Real estate | 2021 |
| Nartium Ltd | Professional & scientific | 2025 |
| Narus Ltd | Professional & scientific | 2022 |
| Nash & Co (Bath) Ltd | Real estate | 2015 |
| Nash House Pulteney Mews Bath Management Company Limited | Households | 1997 |
| Nash Kingston Ltd | Construction | 2023 |
| Nata Delicious Moments Ltd | Hospitality | 2023 |
| Natasha Waldron Media Ltd | Professional & scientific | 2025 |
| Nathan Hall Limited | Hospitality | 2011 |
| National Curriculum Video Limited | Extraterritorial | 1993 |
| National Cutlery Museum Limited | Arts & recreation | 2017 |
| National Telecom Limited | Information & communication | 2024 |
| Native Chiropractic Limited | Health & social care | 2024 |
| Natural Relax (Bath) Ltd | Other services | 2023 |
| Natural Spa Factory Limited | Wholesale & retail | 2016 |
| Natural Stone Restoration & Cleaning Limited | Manufacturing | 2021 |
| Natural Vitality (2014) Ltd | Manufacturing | 2014 |
| Natural World Studios Ltd | Information & communication | 2025 |
| Naughty BUT Nice (Bath) Limited | Other services | 2013 |
| Nauti Crew Ltd | Wholesale & retail | 2023 |
| Navigate Law Limited | Professional & scientific | 2020 |
| Navigate Property Limited | Real estate | 2024 |
| Navigate Tax Limited | Professional & scientific | 2025 |
| Navigator at Brabazon Management Company Limited | Households | 2020 |
| Navy Retreats Limited | Hospitality | 2018 |
| Nazma Estate Ltd | Real estate | 2021 |
| NBH Property and Tax Limited | Real estate | 2025 |
| NC Bath Ltd | Information & communication | 2012 |
| Ncil Prop Co Limited | Real estate | 2025 |
| Ncmco Limited | Financial services | 2024 |
| Nearhome Limited | Professional & scientific | 2020 |
| Nectar Studios Limited | Information & communication | 2023 |
| NED Hannah Deliveries Ltd | Transport & logistics | 2025 |
| Nedelea Trading Limited | Wholesale & retail | 2025 |