| Macknight Limited | Extraterritorial | 2019 |
| Macquip UK Limited | Wholesale & retail | 2025 |
| Macros Health Bar Ltd | Administrative & support | 2016 |
| MAD Mutz & Stylish Cutz Ltd | Transport & logistics | 2024 |
| Madame Crevette Limited | Extraterritorial | 2007 |
| Made by JOE Ltd | Information & communication | 2013 |
| Madeira LOH Associates Limited | Professional & scientific | 2018 |
| Maden Artist Management Limited | Arts & recreation | 2024 |
| Madigan Trading Limited | Real estate | 2021 |
| Madinah Investments Limited | Real estate | 2024 |
| Madison Lounge Studios Ltd | Information & communication | 2022 |
| MAE Stuart Limited | Construction | 2014 |
| MAF Produce Limited | Wholesale & retail | 2024 |
| MAF Resources Limited | Professional & scientific | 2009 |
| Maggie's Soul Food Ltd | Hospitality | 2024 |
| Magic Hand Car Wash (Blackpool) Ltd | Administrative & support | 2026 |
| Magic World Consulting Limited | Information & communication | 2021 |
| Magnolias Management Company Limited | Households | 2003 |
| Magolis Investments Ltd | Real estate | 2025 |
| Magravision Limited | Administrative & support | 2026 |
| Mags Tutoring Limited | Education | 2023 |
| Maha Traders Limited | Wholesale & retail | 2024 |
| Maham Media Limited | Information & communication | 2025 |
| Mahoney Contracts Ltd | Construction | 2009 |
| Main Road Management Company Limited | Households | 1977 |
| Mains Lane Developments Ltd | Construction | 2023 |
| Mains Lane Management Company (Fylde) Limited | Households | 2024 |
| Maison Femme Ltd | Wholesale & retail | 2025 |
| Maisonbel Ltd | Wholesale & retail | 2021 |
| Majestec (BSE) Limited | Construction | 2024 |
| Majnoon Limited | Wholesale & retail | 2025 |
| Majorwelt Limited | Construction | 1982 |
| MAK Brickwork Limited | Construction | 2017 |
| MAK Fencing Limited | Administrative & support | 2006 |
| MAK Hospitality Ltd | Real estate | 2021 |
| MAK Security Solutions Ltd | Administrative & support | 2018 |
| Make ME Personalised Ltd | Wholesale & retail | 2022 |
| Make-Space FLO Ltd | Construction | 2025 |
| Makeney Hall Hotel Ltd | Hospitality | 2020 |
| Maker Properties NW Ltd | Real estate | 2024 |
| Malabarai Ltd | Wholesale & retail | 2025 |
| Mali Yachting Ltd | Extraterritorial | 2023 |
| Malibu Hotel Limited | Hospitality | 2023 |
| Malih Limited | Hospitality | 2019 |
| Malin&Son Ltd | Construction | 2026 |
| Mallina Ltd | Professional & scientific | 2013 |
| Mally's Crafts Limited | Wholesale & retail | 2017 |
| Malver Developments Ltd | Construction | 2024 |
| Mama Roux Records Ltd | Wholesale & retail | 2021 |
| Mamaison Properties Limited | Real estate | 2015 |
| Mammas Italian Ltd | Hospitality | 2021 |
| Management Company for Birchwood Gardens (Marton) Ltd | Households | 2026 |
| Management Heating Limited | Extraterritorial | 2004 |
| Manass Construction Limited | Construction | 2003 |
| Manavgat Best Kebab Ltd | Hospitality | 2024 |
| Manchester Petcare Limited | Professional & scientific | 2006 |
| Mandalay Palace Ltd | Real estate | 2025 |
| MANDIBAL2 PVT Ltd | Real estate | 2026 |
| Mandus House C.I.C. | Hospitality | 2019 |
| Mango Enterprises Limited | Hospitality | 2022 |
| Mankind Designerwear Limited | Wholesale & retail | 1980 |
| Mankind United | Education | 2005 |
| Manleys and Fish Ltd | Wholesale & retail | 2025 |
| Manmics Ltd | Wholesale & retail | 2025 |
| Manomay Limited | Information & communication | 2011 |
| Manor House Park Flat Management Company Limited | Households | 1982 |
| Mantra Collaborative Limited | Arts & recreation | 2025 |
| MAP Electrical Services (UK) Limited | Mining & quarrying | 2013 |
| Maple Joinery | | 1989 |
| Marceline T. Consulting Limited | Education | 2013 |
| Marcomp Limited | Professional & scientific | 2015 |
| Marcos Halal Food Limited | Hospitality | 2025 |
| Margaret Green Ltd | Wholesale & retail | 2025 |
| Margarets Florist (ST. Annes) Limited | Wholesale & retail | 2006 |
| Margerison Holdings Limited | Financial services | 2024 |
| Margerison Limited | Real estate | 2014 |
| Marina View (Burnley) Management Company Limited | Households | 2021 |
| Marionette Facilities Ltd. | Financial services | 1996 |
| Marius Care Ltd | Health & social care | 2022 |
| Mark a Smith Limited | Transport & logistics | 2014 |
| Mark Harris (Holdings) Limited | Financial services | 2017 |
| Mark Holmes Auto Engineering Ltd | Wholesale & retail | 2002 |
| Mark Knight Property Management (on the Fylde Coast) Limited | Real estate | 1997 |
| Mark Rose Limited | Mining & quarrying | 2017 |
| Mark Rouse Concrete Consultancy Ltd | Real estate | 2023 |
| Mark Simmons Consultancy Ltd | Information & communication | 2021 |
| Mark Wilde Electrical Contracting Services Ltd | Energy | 2014 |
| Mark Williams Consultancy Services Ltd | Information & communication | 2017 |
| Market Street Reastraunts Ltd | Hospitality | 2024 |
| Marketindex Limited | Administrative & support | 1990 |
| MARKETINDEX2 Ltd | Administrative & support | 2024 |
| Marketwave Equity Limited | Financial services | 2025 |
| Marks Network Limited | Information & communication | 2014 |
| Marks&Sparkselectricalaccess Ltd | Professional & scientific | 2025 |
| Marlyn AI Limited | Information & communication | 2025 |
| Marok Limited | Information & communication | 2015 |
| Marquis (North) Limited | Construction | 2014 |
| Marquis (Residential) Ltd | Construction | 2007 |
| Marquis (South) Limited | Financial services | 2014 |
| Marquis (West) Limited | Real estate | 2016 |