| MAM Investment Properties Limited | Real estate | 2020 |
| Mamaricca Limited | Arts & recreation | 2014 |
| Mamatoto World Ltd | Wholesale & retail | 2021 |
| Mamidipelly Constructions Ltd | Construction | 2026 |
| Mammoth Texryte Limited | Real estate | 2011 |
| Mams Rentals Ltd | Wholesale & retail | 2026 |
| Mamta Dayal Trading Ltd | Construction | 2023 |
| Manage OUT Finance Ltd | Financial services | 2023 |
| Management Intellectuals Limited | Professional & scientific | 2014 |
| Managenest Ltd | Information & communication | 2026 |
| Manahil Khan Ltd | Wholesale & retail | 2023 |
| Manarat Grocery Ltd | Wholesale & retail | 2018 |
| Manas IT Managed Solutions Limited | Information & communication | 2025 |
| Manat Ltd | Hospitality | 2013 |
| Mandave House Limited | Real estate | 2016 |
| Mandeep Kumar Construction Ltd | Construction | 2024 |
| Mandeep Singh Rattan Ltd | Administrative & support | 2013 |
| Mandheep Informatics Limited | Information & communication | 2008 |
| Manehorse Limited | | 1980 |
| Manforce Facilities Services Ltd | Wholesale & retail | 2019 |
| Manforce Security Ltd | Administrative & support | 2008 |
| Manford Cleaning Services Limited | Administrative & support | 2022 |
| Manford Deluxe Care Ltd | Health & social care | 2019 |
| Mangal Maye Limited | Real estate | 2025 |
| Mangat Property Invesments Ltd | Real estate | 2025 |
| Mangio Limited | Hospitality | 2013 |
| Mango Garden Import & Export Fruit and Vegetables Ltd | Wholesale & retail | 2024 |
| Mango Island Ltd | Real estate | 2023 |
| Mangral Rajput Ltd | Real estate | 2009 |
| Manha Merchant UK Ltd | Wholesale & retail | 2024 |
| Manhais Ltd | Wholesale & retail | 2025 |
| Manhar Properties Ltd | Administrative & support | 2022 |
| Manhe Goods Enterprises Limited | Other services | 2022 |
| Manhiban Ltd | Real estate | 2025 |
| Mani Contracts Ltd | Construction | 2019 |
| Mani Fresh Fruits Limited | Wholesale & retail | 2025 |
| Mani School of Motoring Ltd | Education | 2026 |
| Mania Developers Limited | Wholesale & retail | 2021 |
| Manizeh Limited | Other services | 2018 |
| Manjal Ltd | Hospitality | 2025 |
| Manjbrothers Ltd | Wholesale & retail | 2021 |
| Manjeet Kumar Ltd | Construction | 2026 |
| Manjeet Singh Ltd | Construction | 2022 |
| Manjit Singh Ltd | Construction | 2025 |
| Manjusree Ltd | Real estate | 2024 |
| Mankah Limited | Real estate | 2021 |
| Mann & Land Investments Ltd | Real estate | 2019 |
| Mann Brothers Property Investments Limited | Real estate | 2022 |
| Mann Construction Ltd | Administrative & support | 2025 |
| Mann Investments (UK) Ltd | Real estate | 2011 |
| Mann Management Consulting Limited | Real estate | 2019 |
| Mannar & Co Ltd | Extraterritorial | 2014 |
| Mannat Dream Estates Ltd | Real estate | 2026 |
| Mannoo Car Service Ltd | Transport & logistics | 2024 |
| Mannx Labs Ltd | Information & communication | 2026 |
| Mano Salwa Sweets & Restaurant Ltd | Hospitality | 2020 |
| Manollos 2015 Limited | Transport & logistics | 2015 |
| Manoo JA Ltd | Wholesale & retail | 2025 |
| Manor Abodes Ltd | Real estate | 2025 |
| Manor Accountancy Limited | Professional & scientific | 1998 |
| Manor EA Ltd | Real estate | 2024 |
| Manor IT (UK) Ltd | Information & communication | 2007 |
| Manor Park London Limited | Real estate | 2016 |
| Manor Road (Chigwell) Management Limited | Households | 2002 |
| Manor View Developments Ltd | Real estate | 2025 |
| Manor View Freehold Ltd | Real estate | 2020 |
| Manor View Ltd | Real estate | 2019 |
| Manorhurst Limited | Information & communication | 2016 |
| Manors Sales and Lettings Limited | Hospitality | 2004 |
| Manpowers Group Ltd | Wholesale & retail | 2025 |
| Manpreet Raminder Real Estate Limited | Real estate | 2022 |
| Manpreet Singh Ltd | Construction | 2025 |
| Mansa Musa Ltd | Professional & scientific | 2024 |
| Mansell Estates Ltd | Real estate | 2007 |
| Mansfield Property Holdings Ltd | Real estate | 2017 |
| Mansha Group Limited | Real estate | 2024 |
| Mansi TP Ltd | Wholesale & retail | 2025 |
| Mansuriplumbing Ltd | Construction | 2024 |
| Manta Ground Work Ltd | Construction | 2020 |
| Mantasgo Limited | Manufacturing | 2016 |
| Mantita Ltd | Hospitality | 2023 |
| Manto Construction Limited | Construction | 2025 |
| Manton House Care Home Ltd | Health & social care | 2019 |
| Mantra Enterprises Ltd | Wholesale & retail | 2019 |
| Mantra Global Services Ltd | Administrative & support | 2022 |
| Manus Solutions Limited | Other services | 2004 |
| Manz Group Ltd | Other services | 2021 |
| MAP Real Estate Holdings Ltd | Real estate | 2023 |
| Maple Alley Scientific Limited | Manufacturing | 2025 |
| Maple Leaf Global Ltd | Professional & scientific | 2025 |
| Maple Leaf Property Ltd | Real estate | 2018 |
| Maple Wharf Limited | Professional & scientific | 2016 |
| Mapleslane Homes Limited | Real estate | 2021 |
| Maps & V Ltd | Real estate | 2022 |
| Maqcari Ltd | Wholesale & retail | 2018 |
| Maqsons Management Services Limited | Real estate | 2022 |
| Maqsood&Sons Ltd | Information & communication | 2024 |
| MAR Consult Limited | Professional & scientific | 2014 |
| MAR Hunt Ltd | Construction | 2021 |
| Marabiya Ltd | Hospitality | 2023 |