| My Ziggy Limited | Other services | 2016 |
| MY1HOME Ltd | Real estate | 2025 |
| MYA Management Services Limited | Real estate | 2026 |
| MYB Apartments Ltd. | Real estate | 2019 |
| MYB Hospitality Ltd | Hospitality | 2024 |
| Mybalitrips LP | | 2017 |
| Mybreak Ltd | Wholesale & retail | 2024 |
| Mycare Ltd | Health & social care | 2026 |
| Myco Mara AI Ltd | Professional & scientific | 2025 |
| Mycobee Mushrooms C.I.C. | Agriculture & fishing | 2019 |
| Mycobiologics Limited | Professional & scientific | 2024 |
| Mycos Consulting Ltd | Professional & scientific | 2011 |
| Mycovolt Technologies Ltd | Professional & scientific | 2025 |
| Mycurrys Kitchens Ltd | Hospitality | 2025 |
| Mydex Data Services Community Interest Company | Information & communication | 2007 |
| Mydra Ltd | Professional & scientific | 2024 |
| Myeloma UK | Health & social care | 1998 |
| Myeloma UK Trading Limited | Other services | 2026 |
| Myersbio Ltd | Professional & scientific | 2024 |
| Myfars (Scotland) Ltd | Professional & scientific | 2019 |
| Myflexagent Ltd | Real estate | 2026 |
| Myfootball Ltd | Extraterritorial | 2021 |
| Myfootballfactory Ltd | Extraterritorial | 2021 |
| Myfootballhire Ltd | Administrative & support | 2021 |
| Mygoto.Uk Ltd | Education | 2025 |
| Myhealthscan Limited | Health & social care | 2016 |
| Myideals Limited | Wholesale & retail | 2018 |
| MYK Share Holdings Limited | Extraterritorial | 2025 |
| Myles Better Property Ltd | Real estate | 2020 |
| Myles Limited | Other services | 2002 |
| Myles Retson Hairdressing Ltd. | Other services | 2008 |
| Mylife PA Ltd | Information & communication | 2025 |
| Mylorasta Services LP | | 2015 |
| Mylothemal Ltd | Health & social care | 2025 |
| MYM Consultancy Limited | Professional & scientific | 2019 |
| Mymarketingdirector Ltd | Professional & scientific | 2023 |
| Myntora Ltd | Wholesale & retail | 2025 |
| Myonity Trade LP | | 2013 |
| Myprestige LP | | 2015 |
| Mypro Golf Ltd | Administrative & support | 2017 |
| Myreside Management Limited | Construction | 2000 |
| Myreton Ltd | Information & communication | 2024 |
| Myriads IO LP | | 2017 |
| Myrtho Limited | Health & social care | 2023 |
| MYS Asset Management Limited | Real estate | 2024 |
| MYS Living Limited | Households | 2024 |
| MYS NO.1 Limited | Real estate | 2025 |
| MYS Property Management Limited | Real estate | 2025 |
| Mystayinn Limited | Information & communication | 2023 |
| Mystayinn Real Estate LLC Limited | Real estate | 2023 |
| Mystery Goose Limited | Real estate | 2022 |
| Mystic Dragon Takeaway Limited | Hospitality | 2016 |
| Mystic Hub Ltd | Wholesale & retail | 2025 |
| Mystic Metal Design Limited | Wholesale & retail | 2025 |
| Mystical HEN Ltd | Administrative & support | 2025 |
| Mystique Direct LP | | 2016 |
| Mystirkart Ltd | Wholesale & retail | 2025 |
| Mystory SP | | 2001 |
| Mytae LP | | 2022 |
| Mythic Audio Ltd | Information & communication | 2023 |
| Mythic Monarch Ltd | Information & communication | 2023 |
| Myweezer Co., Ltd | Transport & logistics | 2013 |
| MZ Homes Ltd | Real estate | 2026 |
| MZ Investment Management Ltd | Extraterritorial | 2012 |
| MZ Superstores Ltd | Wholesale & retail | 2023 |
| Mz.Essential.Online Ltd | Wholesale & retail | 2026 |
| Mzee Properties Ltd | Real estate | 2024 |
| Mzgo Ltd | Hospitality | 2022 |
| Mzzn Ltd | Information & communication | 2025 |
| MÁS Creative Ltd | Information & communication | 2026 |
| MÓR Transport Development Place Ltd | Transport & logistics | 2024 |
| N & N Mackay Limited | Financial services | 2024 |
| N and DOC Network Limited | Health & social care | 2025 |
| N C Andrew Ltd | Professional & scientific | 2019 |
| N Cafe Ltd | Hospitality | 2017 |
| N Donald Electrical Services Limited | Other services | 2014 |
| N K Scott Limited | Other services | 2021 |
| N M Architects Limited | Professional & scientific | 2013 |
| N Murray Scott East Lothian Limited | Hospitality | 2026 |
| N Pearce Catering Ltd | Hospitality | 2024 |
| N Quattro SP | | 1911 |
| N Ward Ltd | Wholesale & retail | 2023 |
| N Watt and SON Limited | Construction | 2003 |
| N&A Borz Ltd | Transport & logistics | 2025 |
| N&T Partners LP | | 2013 |
| N-Able Technologies Ltd | Information & communication | 2003 |
| N-Ocean Limited | Professional & scientific | 2024 |
| N-Plast Trade LP | | 2016 |
| N-Tropy Limited | Professional & scientific | 2009 |
| N. H. M. 100 Limited | Administrative & support | 1996 |
| N.A Nails and Spa Ltd | Other services | 2024 |
| N.A. Properties (SC) Ltd | Real estate | 2017 |
| N.C. Head Office Nominees Limited | Professional & scientific | 1922 |
| N.S. Contractors Ltd | Construction | 2018 |
| N.W.G. Investments Limited | Real estate | 2004 |
| N07 Barber Ltd | Other services | 2025 |
| N155 Consulting LP | | 2016 |
| N2 Applied Ltd | Wholesale & retail | 2019 |
| N24 Holdings Ltd | Real estate | 2017 |
| N4 Advisory Ltd | Professional & scientific | 2018 |