| Manenzhe Limited | Health & social care | 2014 |
| Manesh Brothers Ltd | Construction | 2025 |
| Mangal 11 Ltd | Hospitality | 2025 |
| Mangat Construction and Maintenance Ltd | Construction | 2025 |
| Mangat Holdings Ltd | Real estate | 2016 |
| Mangat Properties Ltd | Real estate | 2020 |
| Mangat Solicitors Ltd | Professional & scientific | 2019 |
| Mango Oasis Limited | Wholesale & retail | 2026 |
| Mani's Trade Ltd | Wholesale & retail | 2025 |
| MANIFEST4ALL Ltd | Wholesale & retail | 2023 |
| Manik & Sons Limited | Wholesale & retail | 2024 |
| Manjari Enterprise Limited | Other services | 2011 |
| Manjo Investments Ltd | Real estate | 2023 |
| Manjo Properties Ltd | Real estate | 2025 |
| Manmohan Investments Ltd | Real estate | 2025 |
| Manmohan Stores Ltd | Wholesale & retail | 2025 |
| Manmohan UK Ltd | Wholesale & retail | 2023 |
| Mann & Daughters Properties Ltd | Real estate | 2025 |
| Mann Property Managment Ltd | Real estate | 2023 |
| Mann Singh Property Ltd | Real estate | 2026 |
| Mannat Ahuja UK Ltd | Wholesale & retail | 2024 |
| Mannglobaltrade Ltd | Wholesale & retail | 2026 |
| Manni Engineering Ltd | Wholesale & retail | 2024 |
| Mannsell General Trading Ltd | Wholesale & retail | 2021 |
| Manny PAL 26 Ltd | Wholesale & retail | 2025 |
| Manolie (UK) Consultancy Ltd | Professional & scientific | 2018 |
| Manpreeet Singh Ltd | Construction | 2022 |
| Manpri Services Ltd | Other services | 2020 |
| Mansour Logistics Ltd | Transport & logistics | 2019 |
| Mantane Properties Ltd | Real estate | 2019 |
| Manu Logistics Limited | Transport & logistics | 2026 |
| Manuel Exclusives Limited | Wholesale & retail | 2023 |
| Manvir Transport Ltd | Transport & logistics | 2026 |
| MAR Sawa Ltd. | Wholesale & retail | 2011 |
| Mar.Buc Limited | Real estate | 2022 |
| Mara Bridging Ltd | Administrative & support | 2025 |
| Maraton Ltd | Other services | 2020 |
| Marble Line Interiors Ltd | Construction | 2021 |
| Marchill Investments LLP | | 2005 |
| Marchill Ltd | Arts & recreation | 2005 |
| Marcin Construction Ltd | Construction | 2014 |
| Mardz Digital Media Ltd | Information & communication | 2024 |
| Marek Enterprises Limited | Transport & logistics | 2024 |
| Margin Savings Ltd | Wholesale & retail | 2026 |
| Marhaba UK Limited | Information & communication | 2018 |
| Maria Montessori Ltd. | Education | 2008 |
| Maria Montessori Nursery Limited | Education | 2014 |
| Mariamo Limited | Wholesale & retail | 2026 |
| Maridadi Properties Ltd | Real estate | 2018 |
| Marina Consulting Ltd | Real estate | 2021 |
| Marine Air Tech Ltd | Manufacturing | 2007 |
| Maritime Resources & Teknologies Limited | Professional & scientific | 2011 |
| Marius-Cosmin Costea Ltd | Transport & logistics | 2024 |
| Market Direct Limited | Wholesale & retail | 2014 |
| Market Shoppy Ltd | Administrative & support | 2023 |
| Market Shopy Ltd | Administrative & support | 2026 |
| Marketbysaifi Ltd | Wholesale & retail | 2025 |
| Marketlio Ltd | Wholesale & retail | 2026 |
| Markhor E-Commerce Limited | Manufacturing | 2024 |
| Mars Beat Limited | Wholesale & retail | 2024 |
| Marsh Wall Limited | Wholesale & retail | 2007 |
| Marsh Wall Property Holdings Limited | Financial services | 2019 |
| Marsin Properties Ltd | Households | 2024 |
| Marsvel Properties Limited | Real estate | 2022 |
| Martaan Ltd | Manufacturing | 2023 |
| Martin Food and Wine Ltd | Wholesale & retail | 2015 |
| Martinez International Limited | Administrative & support | 2005 |
| Martivo Limited | Wholesale & retail | 2025 |
| Maruthi IT Services Ltd | Information & communication | 2025 |
| Maruti Cars Limited | Administrative & support | 2025 |
| Maruti Property Ltd | Real estate | 2025 |
| Marvelworx Ltd | Information & communication | 2014 |
| Marwa Food Court Limited | Real estate | 2022 |
| Marwah Cloud and Tech Limited | Wholesale & retail | 2023 |
| Marwah Mobile and Vape Limited | Wholesale & retail | 2021 |
| Mary Driving School Ltd | Education | 2016 |
| Mary Intensive Course Limited | Education | 2025 |
| Maryam Holdings Ltd | Hospitality | 2024 |
| Marye Ceilings Limited | Construction | 2014 |
| Marz Produce Limited | Wholesale & retail | 2012 |
| MAS Prosthetic Ltd | Manufacturing | 2024 |
| Masaledaar Ltd | Wholesale & retail | 2026 |
| Mashomes Investment Limited | Real estate | 2015 |
| Masi Associates Ltd | Administrative & support | 2022 |
| Maskan UK Properties Limited | Real estate | 2025 |
| Masq-Uk Ltd | Construction | 2020 |
| Masry Coffee Ltd | Wholesale & retail | 2013 |
| Mass Courier Limited | Transport & logistics | 2015 |
| Mast Investors Ltd | Real estate | 2020 |
| Master Appliances Limited | Other services | 2023 |
| Master Building Ltd | Construction | 2023 |
| Master Carpets and Flooring Ltd | Construction | 2025 |
| Master Coaches Limited | Transport & logistics | 2022 |
| Master Flow Heating Ltd | Construction | 2026 |
| Master Touch Painters & Decorators Ltd | Construction | 2026 |
| Master's (IT) Solutions Limited | Information & communication | 2013 |
| Masters Music Academy Ltd | Information & communication | 2025 |
| Maswell Engineering Ltd | Construction | 2019 |
| Maswell Park Church | Other services | 2012 |
| Maswell Park Food & Wine Ltd | Wholesale & retail | 2019 |