| Mitrac Limited | Administrative & support | 2019 |
| Mittag Limited | Professional & scientific | 2017 |
| MIV Automotive Ltd | Wholesale & retail | 2024 |
| Miveen Ltd | Wholesale & retail | 2023 |
| MIW Engineering Limited | Transport & logistics | 2016 |
| MJ & SJ Worsley Ltd | Agriculture & fishing | 2021 |
| MJ Creative Ltd | Information & communication | 2025 |
| MJ Hermiston Engineering Limited | Administrative & support | 2013 |
| MJ Morrison Management Services Limited | Professional & scientific | 2015 |
| MJ Project Engineering Solutions Ltd | Other services | 2019 |
| MJ Watt Lerwick Ltd | Administrative & support | 2025 |
| MJ6 Technology Limited | Administrative & support | 2015 |
| MJB Building & Landscapes Ltd | Construction | 2022 |
| MJB Engineering Services Limited | Construction | 2025 |
| Mjbs (Cheshire) Ltd | Construction | 2025 |
| MJC Civil Engineering Ltd. | Construction | 2019 |
| MJC Finance Ltd | Professional & scientific | 2010 |
| Mjde Limited | Other services | 2025 |
| Mjds Contract Services Limited | Transport & logistics | 2012 |
| MJE Management Solutions Limited | Professional & scientific | 2018 |
| MJF Engineering Limited | Professional & scientific | 2021 |
| MJG Business Solutions Limited | Administrative & support | 2009 |
| MJH Interim Limited | Administrative & support | 2025 |
| MJH Piping Limited | Professional & scientific | 2018 |
| MJJ Electrical Ltd | Administrative & support | 2026 |
| MJK Software Limited | Information & communication | 2018 |
| MJN & CJN Limited | Financial services | 2022 |
| MJP Consultancy Services Limited | Professional & scientific | 2020 |
| MJP Management Solutions Limited | Administrative & support | 2016 |
| MJP Telecommunications Ltd | Construction | 2019 |
| MJS Media Group Ltd | Information & communication | 2026 |
| MJW Plumbing & Heating Services Limited | Construction | 2006 |
| MK IT Consultant Limited | Administrative & support | 2015 |
| MK Oceanic Limited | Professional & scientific | 2017 |
| MK4 Solutions Ltd | Construction | 2014 |
| MKB Fire Safety Ltd | Public administration | 2020 |
| MKB MCE Projects Ltd | Construction | 2025 |
| MKC Group Limited | Real estate | 2021 |
| MKD Consulting Services Limited | Administrative & support | 2015 |
| MKD Contracting Ltd | Administrative & support | 2025 |
| MKH Financial Solutions Ltd | Professional & scientific | 2023 |
| Mkkel Ltd | Professional & scientific | 2019 |
| Mkkel Management Ltd | Professional & scientific | 2019 |
| MKL Design Limited | Administrative & support | 2016 |
| MKM Modelling Ltd | Administrative & support | 2022 |
| Mkml Site Solutions Ltd | Construction | 2026 |
| Mknltd Limited | Wholesale & retail | 2025 |
| MKO Consultancy Limited | Professional & scientific | 2014 |
| Mkocher Ltd | Administrative & support | 2021 |
| Mkom (Holdings) Ltd | Manufacturing | 2023 |
| MKR Engineering Limited | Other services | 2018 |
| Mksj Holdings Limited | Financial services | 2019 |
| Mkuns Limited | Construction | 2023 |
| MKW Builders Ltd | Construction | 2021 |
| ML Business Consulting Limited | Professional & scientific | 2017 |
| ML Group Services Limited | Construction | 2025 |
| Mladenium Limited | Transport & logistics | 2016 |
| MLC Engineering Solutions Limited | Construction | 2017 |
| MLC Fixings Ltd | Wholesale & retail | 2024 |
| MLE Trans Ltd | Transport & logistics | 2025 |
| Mlhc INSIGHTS4IMPACT Limited | Professional & scientific | 2024 |
| MLJ Commercial Limited | Professional & scientific | 2023 |
| MLJ Estates Ltd | Real estate | 2021 |
| MLJ Family Investments Ltd | Construction | 2025 |
| Mljo Ltd | Professional & scientific | 2024 |
| MLK Consultancy Limited | Administrative & support | 2019 |
| MLP Marketing Technology Group Limited | Financial services | 2022 |
| MLS Global Ltd | Wholesale & retail | 2019 |
| MLW Enterprises Ltd | Construction | 2014 |
| MLX Management Services Ltd | Administrative & support | 2011 |
| MM Environmental and Safety Management Limited | Administrative & support | 2014 |
| MM Force Consulting Ltd | Information & communication | 2021 |
| MM LBR Ltd | Arts & recreation | 2023 |
| MM Newsagent Ltd | Other services | 2020 |
| MM Surveying Ltd | Administrative & support | 2025 |
| MMA Developments Limited | Construction | 2015 |
| Mmahaz Ltd | Other services | 2024 |
| MMC Electrical Ltd | Administrative & support | 2026 |
| MMC Technical Services Ltd | Construction | 2004 |
| Mmjt Transport Ltd | Transport & logistics | 2018 |
| Mmob Ltd | Information & communication | 2020 |
| Mmota Ltd | Administrative & support | 2021 |
| MMP Business Solutions Limited | Professional & scientific | 2003 |
| MMP Computing Solutions Ltd | Information & communication | 2012 |
| MMS Forecourts Limited | Wholesale & retail | 2018 |
| Mmsj Design Limited | Professional & scientific | 2017 |
| Mmss Reporting Ltd | Health & social care | 2020 |
| MMY Digital Ltd | Administrative & support | 2025 |
| MN & JF Price Limited | Wholesale & retail | 2002 |
| Mnday Performance Ltd | Manufacturing | 2025 |
| MNI Solutions Limited | Administrative & support | 2012 |
| MNK Consultancy Services Limited | Administrative & support | 2023 |
| MNL Maintenance Ltd | Construction | 2026 |
| MNO Accountants Limited | Professional & scientific | 2026 |
| MNS Restaurant Ltd | Hospitality | 2025 |
| MNS Surveying Ltd | Professional & scientific | 2023 |
| MNY Couriers Ltd | Transport & logistics | 2024 |
| Mo's Shawarma Ltd | Other services | 2024 |
| Moat Quality Solutions Ltd | Administrative & support | 2026 |
| Mobberley Cakes Limited | Wholesale & retail | 1999 |