| Mvprimme Limited | Wholesale & retail | 2025 |
| MVT (Motor Vehicle Technicians) Ltd | Wholesale & retail | 2010 |
| MVX International Limited | Wholesale & retail | 2017 |
| MW Advertising Limited | Professional & scientific | 2023 |
| MW Baba Limited | Health & social care | 2013 |
| MW Equine Services Ltd | Arts & recreation | 2024 |
| MW Estate Planning Limited | Financial services | 2015 |
| MW Weymouth Ltd | Hospitality | 2023 |
| MW Wills Ltd | Professional & scientific | 2026 |
| MWG Specialist Marine Services Limited | Agriculture & fishing | 2017 |
| MXG Media Ltd | Professional & scientific | 2018 |
| Mxmgb Ltd | Professional & scientific | 2016 |
| Mxventures Limited | Information & communication | 2024 |
| My Aida Group Ltd | Information & communication | 2025 |
| My Budget Flights Ltd | Administrative & support | 2025 |
| My Business Blueprint Ltd | Professional & scientific | 2025 |
| My Care Ladies Limited | Health & social care | 2013 |
| My Carry Potty Limited | Administrative & support | 2005 |
| My Cloud Consultancy Limited | Administrative & support | 2025 |
| My Cornish Properties Ltd | Real estate | 2015 |
| My Cupid Studio Ltd | Wholesale & retail | 2024 |
| My Leather Gear Ltd | Wholesale & retail | 2023 |
| My New Home Development Ltd | Construction | 2025 |
| My Room Ltd | Real estate | 2022 |
| My Safe Place Southern Ltd | Real estate | 2013 |
| My Salon & Co Ltd | Other services | 2011 |
| My Signature Design Ltd | Wholesale & retail | 2012 |
| My Switch Limited | Information & communication | 2005 |
| My Virtual Assistant Limited | Administrative & support | 2008 |
| My Wellbeing Manager Ltd | Education | 2024 |
| Myacasa Developments Limited | Construction | 2008 |
| Myaccessiblehome Limited | Information & communication | 2025 |
| Myapplabs Ltd | Information & communication | 2026 |
| Mycarrecovery Ltd | Wholesale & retail | 2022 |
| Mycronic Ltd | Manufacturing | 1990 |
| Myfastestmile C.I.C. | Professional & scientific | 2016 |
| Myfitnessspace Limited | Health & social care | 2022 |
| Myheritage (UK) Limited | Information & communication | 2008 |
| Myhie LLP | | 2021 |
| Myinternet Protection Ltd | Information & communication | 2018 |
| Mykoolbox Limited | Manufacturing | 2014 |
| Myleage Consulting Limited | Administrative & support | 2020 |
| Myles New Limited | Professional & scientific | 2006 |
| Mymerchstoreshopify Ltd | Wholesale & retail | 2025 |
| MYO Delivery Ltd | Transport & logistics | 2019 |
| Myshoprender Ltd | Information & communication | 2026 |
| Mysped Ltd | Transport & logistics | 2018 |
| Mystic Motor Ltd | Wholesale & retail | 2021 |
| Mystiqube Consulting Limited | Information & communication | 2024 |
| Myśteree Ltd | Manufacturing | 2021 |
| MZE Global Investments Ltd | Real estate | 2020 |
| MZK Traderz Ltd | Wholesale & retail | 2026 |
| N & P Thermo-Plastic Moulders (Acton) Limited | Manufacturing | 1983 |
| N B Mills (Building Contractors) Ltd | Construction | 2003 |
| N COX Properties Ltd | Hospitality | 2025 |
| N Mullins Consulting Limited | Professional & scientific | 2013 |
| N Organisation Limited | Professional & scientific | 2021 |
| N T Hire Ltd | Administrative & support | 2013 |
| N&S Marine and Leisure Ltd | Hospitality | 2025 |
| N&W Consulting Ltd | Professional & scientific | 2025 |
| N.Double and Company Limited | Wholesale & retail | 1948 |
| N.T.R Projects Ltd | Construction | 2024 |
| N0MVD Apparel Ltd | Wholesale & retail | 2022 |
| N1CO Limited | Construction | 2020 |
| Naad Canterbury Limited | Professional & scientific | 2000 |
| NAB Camas Limited | Households | 1981 |
| Nabil Ahmed Ltd | Wholesale & retail | 2024 |
| Nada Artist Limited | Administrative & support | 2017 |
| Nafees Tandoori Limited | Hospitality | 2025 |
| Nails & Feet UK Ltd | Other services | 2025 |
| Naiquan Ltd | Manufacturing | 2019 |
| Nairn Developments Limited | Construction | 2015 |
| Najat Mohammed Limited | Wholesale & retail | 2025 |
| Naked Bikes Limited | Wholesale & retail | 2021 |
| Naled Limited | Administrative & support | 2013 |
| NAN Driving Services Ltd | Transport & logistics | 2022 |
| Nano Computers Limited | Wholesale & retail | 2022 |
| Nanu Ventures Ltd | Construction | 2025 |
| Nanuskate Ltd | Construction | 2024 |
| NAO Holdings Ltd | Financial services | 2026 |
| Naomi Moods Aesthetics Ltd | Other services | 2025 |
| Napa's Woodwork Ltd | Manufacturing | 2025 |
| Napier Events Ltd | Hospitality | 2013 |
| Napkins Printed Ltd | Wholesale & retail | 2021 |
| NAQ Investment Ltd | Financial services | 2022 |
| NAQ Media Limited | Professional & scientific | 2020 |
| NAR01 Limited | Professional & scientific | 2019 |
| Nara Partners Limited | Information & communication | 2023 |
| Naro Group Ltd | Financial services | 2026 |
| Naro Properties Ltd | Real estate | 2023 |
| Naro Solutions Ltd | Transport & logistics | 2015 |
| Naro UK Ltd | Wholesale & retail | 2016 |
| Narthaus Limited | Extraterritorial | 2024 |
| Narwhal Capital Limited | Financial services | 2021 |
| Nascita Ltd | Wholesale & retail | 2024 |
| Nashit Ltd | Wholesale & retail | 2025 |
| Nassmart Limited | Wholesale & retail | 2020 |
| Natasha Gardens (2007) Limited | Households | 2007 |
| Natax International Limited | Information & communication | 2023 |
| Natbru Ltd | Administrative & support | 2024 |