| Maia Studios Ltd | Wholesale & retail | 2020 |
| Maia Tech Systems Limited | Other services | 2022 |
| Maia Waste Ltd | Water & waste | 2021 |
| Maij Properties Ltd | Real estate | 2024 |
| Maitland Garden Centres Ltd | Wholesale & retail | 2021 |
| Majara Investments Limited | Professional & scientific | 2014 |
| Majara Services Limited | Professional & scientific | 2026 |
| Majestic Decor (Wakefield) Ltd | Construction | 2011 |
| Majestic Property and Consultancy Ltd | Real estate | 2024 |
| Majord Services Ltd | Transport & logistics | 2017 |
| MAK Hair Design Limited | Other services | 2009 |
| MAK Services and Enterprise Ltd | Administrative & support | 2019 |
| MAK Structures Limited | Manufacturing | 2023 |
| Make My Dabba Ltd | Hospitality | 2023 |
| Mak’S Photography Limited | Professional & scientific | 2024 |
| MAL Logistics Ltd | Transport & logistics | 2018 |
| Malagen Ltd | Transport & logistics | 2021 |
| Malbit Limited | Information & communication | 2014 |
| Malcolm Stanley Property Ltd | Real estate | 2024 |
| Malik Accountants Ltd | Professional & scientific | 2023 |
| Malik Prestige Ltd | Administrative & support | 2015 |
| Maliks IT Solutions Ltd | Information & communication | 2019 |
| Mallaig Properties Ltd | Real estate | 2025 |
| Mallard Motor Group Ltd | Wholesale & retail | 2023 |
| Malverse Limited | Other services | 2025 |
| Mama DS Limited | Extraterritorial | 2022 |
| Mamiweb Ltd. | Professional & scientific | 2007 |
| Mamm Services Ltd | Transport & logistics | 2020 |
| Man-Guarding Ltd | Administrative & support | 2022 |
| Man-Med Medicals Ltd | Health & social care | 2015 |
| Mana Landscaping Solutions Ltd | Administrative & support | 2023 |
| Manage Construct Achieve Ltd | Construction | 2020 |
| Management 79 Limited | Professional & scientific | 2015 |
| Management Services (Wakefield) Limited | Real estate | 2002 |
| Mancaves and More Ltd | Wholesale & retail | 2026 |
| Mandinari Citizens in UK C.I.C. | Health & social care | 2024 |
| Mandzelari Summit Holding Limited | Real estate | 2025 |
| Mane & Tails Ltd | Wholesale & retail | 2025 |
| Mango Event Solutions Limited | Construction | 2015 |
| Manned Security Solutions Ltd | Administrative & support | 2018 |
| Mannytech Access Ltd | Construction | 2026 |
| Manor Bathroom Design Limited | Wholesale & retail | 2024 |
| Manor Street Mews Management Company Limited | Real estate | 2007 |
| Mantis Finance Limited | Administrative & support | 2019 |
| Manu Enterprises Limited | Wholesale & retail | 2020 |
| Many Trans Ltd | Transport & logistics | 2015 |
| Manygates Court (Management) Limited | Extraterritorial | 1999 |
| Manygates Holdings Ltd | Construction | 2019 |
| MAP Homes Ltd | Real estate | 2017 |
| MAP SPV 1 Limited | Financial services | 2023 |
| MAP SPV 2 Limited | Financial services | 2025 |
| Maplebridge Holdings Ltd | Real estate | 2020 |
| Marchco Limited | Wholesale & retail | 1995 |
| MARCOM365 Ltd | Transport & logistics | 2022 |
| Mard Valeting Limited | Transport & logistics | 2020 |
| Mardy Developments Ltd | Construction | 2020 |
| Marella Ltd | Real estate | 2022 |
| Maria Barnett Ltd | Professional & scientific | 2025 |
| Mariola Brygida Gasiewicz Ltd | Extraterritorial | 2025 |
| Marios Adamou Limited | Real estate | 2006 |
| Mariusz Parda Ltd | Transport & logistics | 2026 |
| Mariusz Slemp Transport Ltd. | Transport & logistics | 2014 |
| Mark Armstrong Dipwcf Ltd | Professional & scientific | 2012 |
| Mark Dobson Property Limited | Real estate | 2020 |
| Mark French Legacy Consulting Ltd | Professional & scientific | 2026 |
| Mark James Designs Limited | Manufacturing | 2015 |
| Mark Jones Consulting Limited | Financial services | 2011 |
| Mark R Fitzgerald Ltd | Financial services | 2022 |
| Mark Reynolds Risk Management Ltd | Professional & scientific | 2020 |
| Mark Small Holdings Limited | Financial services | 2022 |
| Mark Swift Building Services Ltd | Construction | 2011 |
| Mark Thorley Developments Ltd | Construction | 2025 |
| Markazi Jamia Mosque Wakefield | Other services | 2010 |
| Market Services (UK) Ltd | Administrative & support | 2009 |
| Marketing Automation Ltd | Information & communication | 2020 |
| Marketing by Design LLP | | 2016 |
| Marketing Groupe a G R Limited | Professional & scientific | 2026 |
| Marketing Maker Ltd | Information & communication | 2024 |
| Markies International (UK) Limited | Hospitality | 2025 |
| Markies Ltd | Hospitality | 2021 |
| Marla and Mason Limited | Real estate | 2024 |
| Marlborough & Knight Limited | Real estate | 2025 |
| Marlborough Construction Services Holdings Limited | Financial services | 2021 |
| Marlborough Construction Services Limited | Construction | 1993 |
| Marlborough Homes Yorkshire Limited | Extraterritorial | 2016 |
| Marlin Homes Limited | Construction | 2010 |
| Marlow Trading Limited | Wholesale & retail | 2013 |
| Marmalade on the Square Limited | Wholesale & retail | 2013 |
| Marmaris (WKD) Limited | Hospitality | 2019 |
| Marple Homes Limited | Real estate | 1994 |
| Marris Properties Limited | Real estate | 2017 |
| Marsax Ltd | Professional & scientific | 2016 |
| Marsh Investments Wakefield Limited | Wholesale & retail | 2013 |
| Marsh Yorkshire Limited | Extraterritorial | 2024 |
| Marshall 360 Services Ltd | Administrative & support | 2021 |
| Marshall Civils Limited | Construction | 2019 |
| Marshall Morrison Limited | Wholesale & retail | 2017 |
| Marshall Power Systems Limited | Construction | 2025 |
| Marshway Projects Ltd | Professional & scientific | 2011 |
| Marstella Ltd | Administrative & support | 2019 |