| Mws.Impact&School Ltd | Education | 2025 |
| MWT (MK) Limited | Wholesale & retail | 2025 |
| Mwuk Holding Company Limited | Professional & scientific | 2010 |
| MX LIU Ltd. | Wholesale & retail | 2025 |
| MX Reality Limited | Professional & scientific | 2019 |
| MXI Talent Group Ltd | Administrative & support | 2021 |
| MXN MED Limited | Health & social care | 2022 |
| MXN Property Limited | Real estate | 2021 |
| MXO Used Items Ltd | Wholesale & retail | 2024 |
| My Cafe (Mill Yard Cafe) Ltd | Hospitality | 2020 |
| My Dynasty Limited | Health & social care | 2023 |
| My Green Trip Ltd | Wholesale & retail | 2022 |
| My Healthpod Limited | Wholesale & retail | 2021 |
| My Hire Hub Ltd | Administrative & support | 2025 |
| My Kinda PUB Ltd | Hospitality | 2016 |
| My Manna Limited | Manufacturing | 2023 |
| My New Lifestyle Limited | Other services | 2013 |
| My Pace Learning Ltd | Education | 2024 |
| My Payments ZEN Ltd | Professional & scientific | 2025 |
| My Payroll Solutions Limited | Information & communication | 2023 |
| My Property Angel Ltd | Real estate | 2025 |
| My Safe Custody Limited | Professional & scientific | 2007 |
| My Smart Builds Ltd | Real estate | 2025 |
| My Support Broker C.I.C. | Other services | 2010 |
| My UK Accountant Ltd | Financial services | 2016 |
| My Umrah Travel Ltd | Administrative & support | 2022 |
| My Upper Room Limited | Real estate | 2022 |
| My Urban Abode Ltd. | Real estate | 2023 |
| My Warehouse Limited | Transport & logistics | 2008 |
| Myaddressglobal Ltd | Construction | 2024 |
| Mybayt Ltd | Wholesale & retail | 2025 |
| Mybuttler Ltd | Other services | 2024 |
| Mycho Entertainment Limited | Information & communication | 2013 |
| Mycigarorder.Com Ltd | Wholesale & retail | 2016 |
| Myers Financial Management Limited | Financial services | 2010 |
| Myguard Solutions Ltd | Other services | 2024 |
| Myland Deforest Ltd | Other services | 2024 |
| Mylestone Limited | Hospitality | 2021 |
| Mylifeisadotmov Ltd | Manufacturing | 2017 |
| Mymax Limited Ltd | Information & communication | 2022 |
| Mymiltonkeynes Ltd | Other services | 2001 |
| Myndpower Ltd | Health & social care | 2019 |
| Myndsign Company Ltd | Information & communication | 2013 |
| Mynzye Limited | Professional & scientific | 2022 |
| Mypetzilla Limited | Extraterritorial | 2014 |
| Myplaceuk.Co Limited | Other services | 2013 |
| Myraj Travels Limited | Administrative & support | 2025 |
| Myroom Holdings Limited | Real estate | 2023 |
| MYS Property Investments Limited | Real estate | 2021 |
| Mysaiuniverse Ltd | Wholesale & retail | 2025 |
| Mysha Consulting Ltd | Information & communication | 2022 |
| Mystech Ltd | Information & communication | 2019 |
| Mystic MEG Limited | Information & communication | 1989 |
| Mystique Limited | Information & communication | 2013 |
| Mytal Security UK Ltd | Administrative & support | 2020 |
| Myterika Limited | Professional & scientific | 2024 |
| Mythica Collectables Limited | Wholesale & retail | 2025 |
| Mytrackee Limited | Information & communication | 2022 |
| Myway Cabs Ltd | Transport & logistics | 2025 |
| MZ Tang Ltd. | Wholesale & retail | 2025 |
| MZ3H2000 Ltd | Health & social care | 2024 |
| MZM Care Solutions Ltd | Health & social care | 2023 |
| Mzrz Holdings Limited | Professional & scientific | 2019 |
| N & a Shah Ltd | Health & social care | 2014 |
| N & G Windows Limited | Construction | 2015 |
| N & K Motors Limited | Wholesale & retail | 2018 |
| N & N Ltd | Construction | 2016 |
| N & S Holdings Ltd | Real estate | 2023 |
| N Clark Property Ltd | Real estate | 2019 |
| N E C Construction Ltd | Construction | 2004 |
| N Edwards Plumbing Cambridge Limited | Construction | 2018 |
| N Emmanuel UK Limited | Construction | 2015 |
| N F Hosey Limited | Construction | 2005 |
| N H G Engineering Limited | Professional & scientific | 2024 |
| N J Dunn Carpentry & Joinery Limited | Construction | 2016 |
| N M Electrical Limited | Construction | 2022 |
| N N P Foods Ltd | Hospitality | 2023 |
| N P Food & Wine Ltd | Wholesale & retail | 2012 |
| N R DEY Limited | Professional & scientific | 2011 |
| N&D Cleaning Services Ltd | Administrative & support | 2022 |
| N&E Construction Group Ltd | Construction | 2025 |
| N&S Sons Ltd | Real estate | 2021 |
| N-Gen Tech Ltd | Information & communication | 2018 |
| N-LAI10 Ltd | Professional & scientific | 2017 |
| N-Lec Electrical Installations Ltd | Construction | 2018 |
| N-Sea UK Limited | Mining & quarrying | 2021 |
| N-Sub Estates Ltd | Real estate | 2021 |
| N-Sub Limited | Wholesale & retail | 2007 |
| N. Eagle Building Ltd. | Administrative & support | 2006 |
| N.E.C for IT Limited | Information & communication | 2014 |
| N.K.T.S Sweetman Limited | Manufacturing | 2014 |
| N.R IT Services Limited | Information & communication | 2018 |
| N.Reji Medical Ltd | Health & social care | 2023 |
| N.S.Food & Wine Limited | Wholesale & retail | 2015 |
| N.S.S. Central & Southern Limited | Professional & scientific | 2008 |
| N1 Racing Ltd | Wholesale & retail | 2021 |
| N1CHOLAS Limited | Transport & logistics | 2014 |
| N21 Consulting Limited | Information & communication | 2009 |
| N2SCIENTIFIC Limited | Professional & scientific | 2002 |
| N96 Ventures Limited | Wholesale & retail | 2025 |