| Mizzy Advertising Agency Ltd | Professional & scientific | 2021 |
| Mizzy Wholesale Elctronics Limited | Wholesale & retail | 2019 |
| MJ Brixton Ltd | Hospitality | 2020 |
| MJ Build and Management Ltd | Construction | 2015 |
| MJ Building & Maintenance Ltd | Construction | 2025 |
| MJ Canary Wharf Ltd | Hospitality | 2020 |
| MJ Elite Services Ltd | Information & communication | 2025 |
| MJ Fitness Cardiff Limited | Health & social care | 2020 |
| MJ Global Ventures Ltd | Wholesale & retail | 2025 |
| MJ Hackney Ltd | Hospitality | 2020 |
| MJ Harris Plumbing and Drainage Ltd | Construction | 2025 |
| MJ Hatton Limited | Real estate | 2007 |
| MJ Infotec Limited | Information & communication | 2018 |
| MJ Makes Ltd | Arts & recreation | 2026 |
| MJ Physiotherapy Ltd | Health & social care | 2025 |
| MJ Propertyco Limited | Real estate | 2026 |
| MJ Romero Ltd | Health & social care | 2018 |
| MJ Salmoni Electrical Ltd | Construction | 2021 |
| MJ Tyson Ltd | Professional & scientific | 2011 |
| Mj's Market Ltd | Wholesale & retail | 2023 |
| MJ2 Property Limited | Real estate | 2023 |
| Mjacovella Trading Ltd | Professional & scientific | 2024 |
| MJB Associates LLP | | 2006 |
| MJB Capital (Lancelot Place) Limited | Financial services | 2021 |
| MJB Commissioning Ltd | Professional & scientific | 2014 |
| MJB Rail Ltd | Manufacturing | 2019 |
| Mjbb Ltd. | Financial services | 2023 |
| MJC Building Ltd | Construction | 2020 |
| MJC Consulting Group Ltd | Construction | 2025 |
| Mjco Ltd | Information & communication | 2013 |
| MJD Facades Limited | Construction | 2025 |
| MJD Installs Limited | Construction | 2023 |
| Mjeku Estates Ltd | Construction | 2025 |
| MJF Limited | Manufacturing | 2019 |
| MJG Carpentry and Construction Ltd | Construction | 2019 |
| Mjholt Properties Ltd | Real estate | 2025 |
| MJI Design Limited | Information & communication | 2012 |
| MJJ 2025 Consulting Limited | Professional & scientific | 2025 |
| Mjjd Property Limited | Real estate | 2017 |
| Mjkuk Ltd | Wholesale & retail | 2020 |
| MJL Clark Properties Ltd | Real estate | 2022 |
| MJP 2017 Limited | Administrative & support | 2017 |
| MJP Coaching Limited | Education | 2025 |
| MJP Tech Ltd | Information & communication | 2026 |
| MJR Automotive Limited | Wholesale & retail | 2015 |
| MJR Ltd | Administrative & support | 2022 |
| MJR Plumbing & Heating Limited | Manufacturing | 2012 |
| Mjritsolutions Ltd | Information & communication | 2022 |
| MJS Stores Limited | Wholesale & retail | 2013 |
| MJS Timber Frame Limited | Construction | 2019 |
| MJT Healthcare Ltd | Health & social care | 2020 |
| Mjw-Properties Rental Limited | Real estate | 2022 |
| MK ALL Network Communications Ltd | Information & communication | 2019 |
| MK Cardiff Ltd | Hospitality | 2021 |
| MK Cutz Ltd | Other services | 2025 |
| MK Dimitar Ltd | Construction | 2019 |
| MK Dream Trading Ltd | Wholesale & retail | 2026 |
| MK Fascias Ltd | Construction | 2010 |
| MK Glazing Ltd | Construction | 2023 |
| MK Hirani Limited | Real estate | 2021 |
| MK Machinery Repair Limited | Manufacturing | 2025 |
| MK Pension Trustees UK Limited | Professional & scientific | 1985 |
| MK Property and Holdings Ltd | Real estate | 2019 |
| MK Solution UK Limited | Information & communication | 2014 |
| MK Ssas Trustees Limited | Financial services | 2020 |
| MK Subsea Limited | Professional & scientific | 2017 |
| MK Takeaway Ltd | Hospitality | 2025 |
| MK Treat Limited | Hospitality | 2025 |
| MK Trustees (Southern) UK Limited | Administrative & support | 1994 |
| MK Trustees UK Limited | Financial services | 1982 |
| MK Ultra Studios Ltd | Manufacturing | 2024 |
| MK&CO7 PVT Ltd | Manufacturing | 2025 |
| MK1 Site Services Ltd | Construction | 2014 |
| MK19 Productions Ltd | Information & communication | 2025 |
| MK57 Ltd | Real estate | 2014 |
| MKA Digital Ltd | Professional & scientific | 2017 |
| MKA Motors Ltd | Wholesale & retail | 2019 |
| MKB Hotels Ltd | Hospitality | 2022 |
| Mkbdproperties Ltd | Real estate | 2025 |
| Mkbig Retail Ltd | Wholesale & retail | 2026 |
| MKD Automotive MK Ltd | Wholesale & retail | 2025 |
| MKH (Supplies) Ltd | Wholesale & retail | 2020 |
| MKH Sales Ltd | Wholesale & retail | 2022 |
| MKJ Letting Ltd | Real estate | 2026 |
| Mkkj Partners Ltd | Other services | 2026 |
| Mkluxury Ltd | Wholesale & retail | 2025 |
| MKM Builders Ltd | Construction | 2017 |
| Mkmt Hedge Capital Ltd | Professional & scientific | 2021 |
| MKN Interprises Ltd | Wholesale & retail | 2025 |
| MKR Mortgages Limited | Financial services | 2020 |
| MKS Security Ltd | Administrative & support | 2017 |
| Mksa Overseas Ltd | Wholesale & retail | 2025 |
| Mkskeys Ltd | Other services | 2023 |
| MKT Distribution Limited | Wholesale & retail | 2025 |
| ML Hospitality Limited | Hospitality | 2022 |
| ML Hussain Ltd | Wholesale & retail | 2017 |
| ML Maintenance Ltd | Administrative & support | 2024 |
| ML Marketing & Consultancy Limited | Professional & scientific | 2021 |
| ML Prime Properties Ltd | Real estate | 2024 |
| ML Property Solutions Limited | Real estate | 2019 |