| Magna PAK Ltd | Manufacturing | 2026 |
| Magna Windows Limited | Construction | 2004 |
| Magnelo Limited | Professional & scientific | 2016 |
| Magnetic Park Management Limited | Real estate | 2006 |
| Magnetik Ltd | Wholesale & retail | 2025 |
| Magneto IT Solutions UK Ltd | Information & communication | 2022 |
| Magnifique Events Limited | Arts & recreation | 2023 |
| Magnifique Hospitality Limited | Other services | 2016 |
| Magnify DM Limited | Professional & scientific | 2024 |
| Magnify UK Ltd | Professional & scientific | 2024 |
| Magnitude Marketing Ltd | Information & communication | 2025 |
| Magnolia Shop Ltd | Wholesale & retail | 2019 |
| Magnum Bournemouth Limited | Real estate | 2014 |
| Magnum Care Limited | Extraterritorial | 1985 |
| Magnum Foods Limited | Real estate | 1999 |
| Magnum Medicals Limited | Professional & scientific | 2014 |
| Magnum Products Ltd | Wholesale & retail | 2005 |
| Magnum Property Management Ltd | Construction | 2026 |
| Magnus Cleopatra Rentals Tourism Travels Agent Ltd | Wholesale & retail | 2026 |
| Magtech Airconditioning Services Limited | Construction | 2012 |
| Magunus Brand Distribution Ltd | Wholesale & retail | 2026 |
| MAH Carpentry & Joinery Limited | Construction | 2019 |
| MAH Printing Limited | Manufacturing | 2025 |
| Maha Interactive Labs Ltd | Information & communication | 2026 |
| Mahadev Trading Ltd | Wholesale & retail | 2023 |
| Mahaiya Ltd | Real estate | 2020 |
| Mahakaal Investment Group Ltd | Real estate | 2024 |
| Mahal Properties (Leicester) Ltd | Real estate | 2023 |
| Mahal Transport Ltd | Transport & logistics | 2017 |
| Mahalaxmi Traders Ltd | Wholesale & retail | 2021 |
| Mahamud Holdings Limited | Financial services | 2020 |
| Mahamud Homes Limited | Construction | 2020 |
| Mahant Properties Limited | Real estate | 2017 |
| Mahant Swami Trading Limited | Wholesale & retail | 2023 |
| Mahar Visioncare Limited | Health & social care | 2006 |
| Maharaja Spice Limited | Hospitality | 2016 |
| Maharaniyan Limited | Other services | 2025 |
| Maharjan Property Limited | Real estate | 2024 |
| Mahashakti Logistics Limited | Transport & logistics | 2025 |
| Mahasin Knowledge Group Limited | Professional & scientific | 2025 |
| Mahd Cleaning Ltd | Administrative & support | 2025 |
| Maheen Trade Ltd | Manufacturing | 2025 |
| Mahek Jewelers Ltd | Wholesale & retail | 2025 |
| Maher Estate Ltd | Real estate | 2025 |
| Maher Foundation | Education | 2008 |
| Maher Motor Ltd | Wholesale & retail | 2021 |
| Maher PVT Ltd | Health & social care | 2018 |
| Mahesh the Maker Ltd | Professional & scientific | 2026 |
| Mahi & Rudra Limited | Wholesale & retail | 2025 |
| Mahi Estates Ltd | Real estate | 2021 |
| Mahi Tours and Travels Ltd | Administrative & support | 2025 |
| Mahip Retail Store Ltd | Wholesale & retail | 2025 |
| Mahir Fruit and Vegetable Ltd | Wholesale & retail | 2024 |
| Mahir Jama Ltd | Construction | 2025 |
| Mahmadarif Sheikh Ltd | Transport & logistics | 2022 |
| Mahmoud Mustafa Al-Atbani for Trade and Supplies Ltd | Wholesale & retail | 2025 |
| Mahogo Property Solutions Ltd | Hospitality | 2025 |
| Mahre Developments Limited | Real estate | 2019 |
| Mahroz Ltd | Financial services | 2025 |
| Mahsa Dent Ltd | Health & social care | 2021 |
| Mahtec Ltd | Manufacturing | 2018 |
| Mahvid Limited | Transport & logistics | 2025 |
| MAI Fatima Limited | Real estate | 2024 |
| MAI Fatima Properties LLP | | 2022 |
| MAI Kitchen Ltd | Other services | 2024 |
| MAI Properties Ltd | Real estate | 2017 |
| Maia Gelato & Desserts Limited | Hospitality | 2025 |
| Maid to Impress Cleaning Services Ltd | Administrative & support | 2025 |
| Maidstone Developers Limited | Real estate | 2022 |
| Maidstone Paintworks Ltd | Wholesale & retail | 2024 |
| Maika Ltd | Other services | 2017 |
| Mail My Parcel Ltd | Transport & logistics | 2024 |
| Mailbox DM (Holdings) Ltd | Transport & logistics | 2020 |
| Main Confiden Catering Ltd | Manufacturing | 2024 |
| Main Line Bearing Co. Limited | Wholesale & retail | 1976 |
| Main Power Electrical Ltd | Construction | 2024 |
| Main Prop System Ltd | Hospitality | 2024 |
| Main River Ltd | Hospitality | 2011 |
| Main Street Barbers (Ratby) Ltd | Other services | 2024 |
| Main Street Fish Ltd | Hospitality | 2023 |
| Main Street Garage Humberstone Ltd | Wholesale & retail | 2023 |
| Main Street Signs Limited | Other services | 2006 |
| Maine Motors Limited | Wholesale & retail | 2025 |
| Mainframe Bytes Ltd | Information & communication | 2015 |
| Maini & Co Ltd | Professional & scientific | 2014 |
| Maini and Sons Limited | Transport & logistics | 2019 |
| Mainline Electronics (Leicester) Limited | Administrative & support | 2001 |
| Mainline UK Trading Limited | Wholesale & retail | 2026 |
| Mains Estates Limited | Real estate | 2017 |
| Maintenance Solutions & Services Limited | Manufacturing | 2006 |
| Maintenance Time Ltd | Construction | 2026 |
| Maisie Darling Ltd | Wholesale & retail | 2019 |
| Maison DE Class Ltd | Hospitality | 2026 |
| Maison DES Animaux Ltd | Agriculture & fishing | 2021 |
| Maison Executive Cars Ltd | Transport & logistics | 2024 |
| Maison Home Styling Ltd | Professional & scientific | 2022 |
| Maison LE LOU Ltd | Wholesale & retail | 2015 |
| Maison MYM Joinery Ltd | Manufacturing | 2025 |
| Maison Rose Ltd | Hospitality | 2021 |
| Maisonarganique Ltd | Manufacturing | 2026 |