| Manchester Refrigeration Techniques Limited | Construction | 1974 |
| Manchester Restaurant and Bar Limited | Hospitality | 2024 |
| Manchester Road Surfacing Holdings Limited | Construction | 2014 |
| Manchester Road Surfacing Limited | Construction | 1998 |
| Manchester Spraying Solutions Ltd | Construction | 2020 |
| Manchester Tech Events Limited | Information & communication | 2021 |
| Manchester Window Tinting Company Limited | Extraterritorial | 2020 |
| Manchesterepcservice Ltd | Construction | 2026 |
| Mancunian Motor Company Ltd | Wholesale & retail | 2024 |
| Mandale Park Developments Limited | Administrative & support | 1988 |
| Mandeville Digital Ltd | Information & communication | 2025 |
| Mandeville Holdco Limited | Financial services | 2024 |
| Mandeville Place Limited | Construction | 2024 |
| Mandi Transport Ltd | Transport & logistics | 2021 |
| Mandy Winrow Styling Ltd | Other services | 2014 |
| Mane Products Ltd | Wholesale & retail | 2022 |
| Manford Consultant Limited | Construction | 2025 |
| Manfredi Business Technologies Limited | Households | 2004 |
| Manfredi's (Bolton) Limited | Wholesale & retail | 2019 |
| Mangalaya Limited | Real estate | 2018 |
| Mangerapharm Ltd | Health & social care | 2019 |
| Mango Flower Ltd | Wholesale & retail | 2025 |
| Mango Tree Properties NW Ltd | Real estate | 2024 |
| Manhattan Estates Bolton Limited | Real estate | 2018 |
| Manhattan Properties & Management Ltd | Real estate | 2011 |
| Mani Malar Health Limited | Health & social care | 2015 |
| Manjeff Fruit & VEG Limited | Wholesale & retail | 2025 |
| Manley Infrastructure Services Ltd | Information & communication | 2026 |
| Mannings Lane Developments Limited | Real estate | 2008 |
| Manny Europe Limited | Health & social care | 2013 |
| Manoai Limited | Information & communication | 2026 |
| Manor Elite Horseboxes Limited | Manufacturing | 2020 |
| Manor News Point Ltd | Wholesale & retail | 2012 |
| Manor Properties North West Ltd | Households | 2022 |
| Manorhouse Upholstery Limited | Water & waste | 1987 |
| Mantle Property Services Limited | Extraterritorial | 2013 |
| Mantra CBD Ltd | Wholesale & retail | 2019 |
| Manufacturers Alliance Ltd | Professional & scientific | 2018 |
| Manufacturing Solutions (UK) Limited | Administrative & support | 2012 |
| Manville & Co Consulting Ltd. | Professional & scientific | 2018 |
| Manx Autos Ltd | Wholesale & retail | 2025 |
| Many Numbers Ltd | Professional & scientific | 2024 |
| Manydots Ltd | Professional & scientific | 2016 |
| Manzil Realty Ltd | Real estate | 2025 |
| Maori UK Limited | Real estate | 2018 |
| MAP Business Ltd | Wholesale & retail | 2025 |
| MAP Reduce Limited | Administrative & support | 2016 |
| Maple Building Design Limited | Professional & scientific | 2021 |
| Maple Jade Limited | Other services | 2024 |
| Maplewood Dynamics Ltd | Wholesale & retail | 2025 |
| Maplewood Gardens (Management Company) Limited | Households | 1989 |
| Maprel and Co Ltd | Public administration | 2020 |
| Maprel Signs Ltd | Other services | 2018 |
| Mapumba Limited | Financial services | 2014 |
| Maqam Travel and Tour Limited | Administrative & support | 2026 |
| Maqash Ltd | Wholesale & retail | 2024 |
| Maqs Mart Ltd | Wholesale & retail | 2025 |
| Maqss Mart Ltd | Wholesale & retail | 2025 |
| MAR Electrical Contractors Ltd | Manufacturing | 2012 |
| MAR Property Consultants Limited | Administrative & support | 2021 |
| Mara Spa Ltd | Extraterritorial | 2023 |
| Marang BW Limited | Wholesale & retail | 2010 |
| Maratil Limited | Administrative & support | 2022 |
| Marble Units Limited | Wholesale & retail | 2020 |
| Marbull Group Limited | Financial services | 2024 |
| Marbull Properties Ltd | Real estate | 2022 |
| Marcas Globales DE Flujo Comercial Limited | Wholesale & retail | 2020 |
| Marceline Homes Ltd | Real estate | 2019 |
| Marceloni Ltd | Real estate | 2024 |
| Marcin.Builders Ltd | Construction | 2023 |
| Marco Community Enterprises CIC | Arts & recreation | 2025 |
| Marcus Humphrey Catering Ltd | Hospitality | 2025 |
| Mareo Trading Limited | Wholesale & retail | 2025 |
| Marf Ltd | Wholesale & retail | 2021 |
| Marf Retail Ltd | Wholesale & retail | 2024 |
| Margam SA Properties Ltd | Real estate | 2023 |
| Marhaba Delicacies Ltd | Manufacturing | 2025 |
| Marhaba Events Ltd | Hospitality | 2024 |
| Marhaba Newsagents Ltd. | Wholesale & retail | 1995 |
| Marhaba Stores Ltd | Wholesale & retail | 2025 |
| Maria Ryan Consulting Limited | Professional & scientific | 2023 |
| Maria's Deli Limited | Hospitality | 2022 |
| Mariam Opticals Ltd | Health & social care | 2022 |
| Marie Gold Limited | Administrative & support | 2019 |
| Marina Masica Ltd | Wholesale & retail | 2025 |
| Marina’S Cleaners Ltd | Administrative & support | 2025 |
| Marine Aquatics and Reptiles Ltd | Wholesale & retail | 2026 |
| Mariofix Property Maintenance Ltd | Administrative & support | 2024 |
| Mariposa Rentals Limited | Real estate | 2023 |
| MARIROB1 Ltd | Health & social care | 2024 |
| Maris Lettings Ltd | Real estate | 2020 |
| Marisola Ltd | Information & communication | 2019 |
| Maritony & Associates Ltd | Professional & scientific | 2023 |
| Marittima Ltd. | Professional & scientific | 2019 |
| Mark Baglow Training Limited | Professional & scientific | 2024 |
| Mark Coia Imaging Services Ltd | Information & communication | 2022 |
| Mark Copeland Services Limited | Transport & logistics | 2016 |
| Mark Coulter Civil Engineering Limited | Construction | 2016 |
| Mark Evans Retail Futures Design Limited | Other services | 2012 |
| Mark Express 1 Limited | Transport & logistics | 2018 |