| MAI Trading Ltd | Manufacturing | 2018 |
| Maidenhead Limited | Professional & scientific | 2023 |
| Maine Events Limited | Arts & recreation | 1996 |
| Mainmarket London & Co | | 1989 |
| Maison Libre Ltd | Wholesale & retail | 2019 |
| Maison Mina Ltd | Administrative & support | 2023 |
| Maisuria Accounting Services Ltd | Professional & scientific | 2012 |
| Maitrise Hotels Limited | Hospitality | 2009 |
| Maitrise Properties Limited | Financial services | 2025 |
| Major Trading Co. Ltd | Wholesale & retail | 2002 |
| MAK Financial Solutions Ltd | Professional & scientific | 2021 |
| MAK Hamilton & Co Ltd | Professional & scientific | 2021 |
| MAK Production Limited | Wholesale & retail | 2014 |
| Maka World Ltd | Wholesale & retail | 2020 |
| Makachu Limited | Administrative & support | 2014 |
| Makbros Limited | Wholesale & retail | 2001 |
| Make IT Mine Limited | Wholesale & retail | 2025 |
| Maker Works Ltd | Real estate | 2019 |
| Makhan Masala Ltd | Hospitality | 2026 |
| Making Major Changes Ltd | Wholesale & retail | 2021 |
| Makkiyah Brothers Limited | Administrative & support | 2016 |
| MAL Decorators Limited | Construction | 2022 |
| Malar Super Market UK Ltd | Wholesale & retail | 2014 |
| Malibu Bathrooms & Kitchens Ltd | Wholesale & retail | 2001 |
| Malikai Ltd | Wholesale & retail | 2021 |
| Malikai Properties Ltd | Real estate | 2026 |
| Malizi Construction Ltd | Construction | 2020 |
| Mallard Bathrooms & Plumbing Ltd | Construction | 2022 |
| Mallu Brothers Limited | Hospitality | 2024 |
| Malook Ratan Properties Limited | Real estate | 2017 |
| Malt Accounting Services Limited | Professional & scientific | 2022 |
| Mam's Caffè Ltd | Manufacturing | 2025 |
| Maman Cook Ltd | Hospitality | 2021 |
| Mamasmiles Ltd | Wholesale & retail | 2024 |
| Mamtora Investments Limited | Real estate | 2026 |
| MAN Cat Van Ltd | Transport & logistics | 2020 |
| Managed Buy Limited | Administrative & support | 2019 |
| Manandhar Properties Limited | Real estate | 2023 |
| Manani Investment Ltd | Real estate | 2024 |
| Manara Holdings Ltd | Professional & scientific | 2021 |
| Manara Real Estate Ltd | Real estate | 2021 |
| Manara Trading Ltd | Professional & scientific | 2021 |
| Mance Perf Management Limited | Information & communication | 2026 |
| Mandala Ventures Limited | Real estate | 2021 |
| Mandalika Foods Limited | Hospitality | 2020 |
| Mandarin House 105 Ltd | Hospitality | 2021 |
| Mandor Ltd | Wholesale & retail | 2019 |
| Manek Chowk Limited | Hospitality | 2023 |
| Mango Legal Limited | Professional & scientific | 2025 |
| Mango Marketing and Events Limited | Professional & scientific | 2019 |
| Mango Tree Estate Ltd | Real estate | 2021 |
| Mango Tree Medical Ltd | Wholesale & retail | 2022 |
| Mangusa Ltd | Wholesale & retail | 2022 |
| Manh HAN (Wembley) Limited | Manufacturing | 2022 |
| Manh HAN Kingdom Ltd | Manufacturing | 2026 |
| Manh HAN Limited | Manufacturing | 2003 |
| Maniaba Limited | Construction | 2021 |
| Manifest Estates Limited | Real estate | 2017 |
| Manik Marketing Ltd | Wholesale & retail | 2017 |
| Manisures Limited | Real estate | 1979 |
| Manj Musik Limited | Other services | 2018 |
| Mankamana Trading Limited | Hospitality | 2018 |
| Mann Education Ltd | Education | 2026 |
| Mannat Caterers Ltd | Hospitality | 2022 |
| Mannat Tech Ltd | Wholesale & retail | 2025 |
| Mannica Creations Ltd | Hospitality | 2024 |
| Manny Hopkins Ltd | Wholesale & retail | 2011 |
| Manolo Services Limited | Construction | 2020 |
| Manor House Business Park Management Company Limited | Real estate | 2010 |
| Mansa Musa Wholesale Limited | Wholesale & retail | 2023 |
| Mansi Beverages Importer Ltd | Wholesale & retail | 2025 |
| Mansu Direct Ltd | Wholesale & retail | 2024 |
| Mantra Cleaning Services Ltd | Administrative & support | 2026 |
| Mantra Food& Wine Ltd | Wholesale & retail | 2025 |
| Manuel Properties Ltd | Real estate | 2024 |
| Manvitech Solutions Ltd | Information & communication | 2024 |
| Many Thoughts Limited | Professional & scientific | 2011 |
| Manya Foods Limited | Hospitality | 2021 |
| Mappa Technologies Ltd | Information & communication | 2024 |
| MAQ Accounting Services Ltd | Professional & scientific | 2021 |
| Marai Styles Ltd | Wholesale & retail | 2026 |
| Maram Homes Ltd | Real estate | 2025 |
| Marangoni Refurbishment Ltd | Construction | 2019 |
| Marawan Training Academy Limited | Arts & recreation | 2025 |
| Marbellane Ltd | Information & communication | 2018 |
| Marble Arches Ltd | Manufacturing | 2025 |
| Marble Studio Ltd | Manufacturing | 2026 |
| Marcel Mark Limited | Information & communication | 2009 |
| Marcin Szewczyk Limited | Professional & scientific | 2008 |
| Marco Vinattieri Amelotti Ltd | Health & social care | 2026 |
| Marcusan Ltd | Professional & scientific | 2023 |
| Maria Car Hire Ltd | Transport & logistics | 2021 |
| Mariam Bakir Limited | Professional & scientific | 2023 |
| Marian&Co Transport Limited | Transport & logistics | 2018 |
| Mariantus Diseno Ltd | Professional & scientific | 2023 |
| Marina Bay Camden Ltd | Hospitality | 2026 |
| Mario G Ltd | Other services | 2024 |
| Mario MC Ltd | Construction | 2014 |
| Mario Productions Limited | Arts & recreation | 2003 |
| Marjan’S Collection Ltd | Wholesale & retail | 2021 |