| Mula Estates Ltd | Real estate | 2020 |
| Mulamiri Estates LLP | | 2006 |
| Mulberry Fabrications Ltd | Administrative & support | 2009 |
| Mulberry House Care Limited | Health & social care | 2026 |
| Mulberry Property Rentals Limited | Real estate | 2021 |
| Muller Asset Management Limited | Real estate | 2014 |
| Muller Estates (Maylands) LLP | | 2011 |
| Multan Courtyard Ltd | Hospitality | 2026 |
| Multi Ace Limited | Other services | 2024 |
| Multi Clicks Digital Solutions Ltd | Information & communication | 2019 |
| Multispice Foods Ltd | Hospitality | 2019 |
| Mulvaney Ltd | Financial services | 2023 |
| Mumzie Healthcare Limited | Health & social care | 2023 |
| Munck Studios Ltd | Information & communication | 2020 |
| Munir Son's Ltd | Wholesale & retail | 2025 |
| Muntean Retail Limited | Wholesale & retail | 2025 |
| Murray House Limited | Administrative & support | 1999 |
| Musa Cars Ltd | Administrative & support | 2022 |
| Musa Properties Staffs Limited | Real estate | 2026 |
| Musafir Events Limited | Hospitality | 2026 |
| Musclefit Menswear Limited | Information & communication | 2021 |
| Museum Street College Development Limited | Construction | 2018 |
| Mushroom Ecom Ltd | Wholesale & retail | 2026 |
| Music Mania Holdings Limited | Financial services | 2018 |
| Music Squad Cheshire LLP | | 2024 |
| Music Squad Limited | Education | 2021 |
| MUSTAFA1257 Ltd | Wholesale & retail | 2024 |
| Mutual Care Services Limited | Administrative & support | 2019 |
| MV Grouping Ltd | Financial services | 2022 |
| MV Rentals Ltd | Real estate | 2022 |
| Mvss Ltd | Wholesale & retail | 2023 |
| MW Soft Solutions Ltd | Information & communication | 2020 |
| MW Vehicle Repairs Limited | Wholesale & retail | 2017 |
| Mwatt Ltd | Professional & scientific | 2023 |
| MWH Developments Ltd | Construction | 2015 |
| Mwidau Holdings Limited | Financial services | 2025 |
| MWS Solutions Ltd | Hospitality | 2016 |
| MXN Communications Ltd | Information & communication | 2020 |
| My @ Mortgages Ltd | Financial services | 2021 |
| My Beautiful Parts Ltd | Wholesale & retail | 2019 |
| My Coach for Life Consultancy Limited | Other services | 2020 |
| My DEL Box Limited | Wholesale & retail | 2026 |
| My Dream Home Building and Electrical Services Ltd | Construction | 2020 |
| My Financial Planning Partner Ltd | Financial services | 2004 |
| My Gelato Ltd | Hospitality | 2021 |
| My Healthcare Management Ltd | Professional & scientific | 2015 |
| My House 2020 Ltd | Households | 2020 |
| My Luxury Bathrooms Limited | Wholesale & retail | 2018 |
| My Mundo Consultancy Ltd | Professional & scientific | 2025 |
| My Order Line Limited | Administrative & support | 2026 |
| My Pregnancy Nest Ltd | Information & communication | 2024 |
| My Taxi Private Hire Limited | Transport & logistics | 2019 |
| My Time of Peace Spa and Beauty Salons Ltd | Other services | 2022 |
| Myatt's Property Services Ltd | Construction | 2014 |
| Mybatsurvey Ltd | Professional & scientific | 2026 |
| Mycoted Ltd | Agriculture & fishing | 2003 |
| Myhomies Limited | Transport & logistics | 2025 |
| Myke Caulton Floral Couture Ltd | Wholesale & retail | 2018 |
| Myles Renovations Limited | Real estate | 2015 |
| Mylyster Ltd | Wholesale & retail | 2025 |
| Mynest Builders Ltd | Construction | 2021 |
| Mynest Property Management Limited | Real estate | 2024 |
| Mynome Ltd | Information & communication | 2022 |
| Myoctopus Ltd | Wholesale & retail | 2026 |
| Myparcelmate Ltd | Transport & logistics | 2025 |
| Myparcelstore Limited | Transport & logistics | 2019 |
| Myre Group Limited | Real estate | 2023 |
| Myre Property Sourcing Limited | Real estate | 2024 |
| Myride (Stoke on Trent) Ltd | Transport & logistics | 2025 |
| Mystic Mona Ltd | Extraterritorial | 2024 |
| Mystical Urvisha Consultancy Limited | Health & social care | 2020 |
| Mystk Ltd | Financial services | 2022 |
| Mytech Direct UK Ltd | Wholesale & retail | 2023 |
| Mythic Drops Ltd | Manufacturing | 2026 |
| MYY Venture Capital Ltd | Professional & scientific | 2024 |
| MZ Restaurant (Crew) Ltd | Wholesale & retail | 2021 |
| MZ Restaurant (Stoke) Ltd | Hospitality | 2019 |
| MZ Visuals Limited | Manufacturing | 2025 |
| Mzialife Ltd | Wholesale & retail | 2025 |
| MZM Hub Ltd | Wholesale & retail | 2025 |
| MZR Premium Meats Ltd | Wholesale & retail | 2024 |
| N & J Hospitality Ltd | Hospitality | 2019 |
| N & Y (UK) Limited | Construction | 2013 |
| N a Ammerlaan Limited | Professional & scientific | 2023 |
| N B Colour Print Limited | Manufacturing | 1991 |
| N C Construction Limited | Construction | 2015 |
| N J C Plastering & Rendering Ltd | Construction | 2026 |
| N Mcnulty Joinery Ltd | Construction | 2002 |
| N R Homes & Developments Limited | Real estate | 2024 |
| N T Conversions Ltd | Manufacturing | 2020 |
| N T Hughes Building Services Limited | Construction | 2016 |
| N&C Properties (Midlands) Limited | Construction | 2018 |
| N&L Rouholamin Ltd | Health & social care | 2019 |
| N&R Desserts Ltd | Hospitality | 2024 |
| N. B. Marketing Limited | Real estate | 2004 |
| N.B. Will Writing Limited | Professional & scientific | 2025 |
| N.B.S. Services (UK) Limited | Wholesale & retail | 2014 |
| N.F.K.H. Limited | Real estate | 1964 |
| N.S. Transportation Services Ltd | Transport & logistics | 2026 |
| N.S.I. (GB) Limited | Administrative & support | 2001 |