| Makowhiteness Chemicals UK Limited | Wholesale & retail | 2016 |
| Maks Logistics Ltd | Transport & logistics | 2023 |
| Makuzha Ltd. | Health & social care | 2017 |
| Makz Holdings Ltd | Real estate | 2023 |
| MAL FRY Chef Consultancy Limited | Hospitality | 2015 |
| Mala Care Services Ltd | Health & social care | 2025 |
| Mala Thai Massage Ltd | Health & social care | 2019 |
| Mala Thai Therapy Limited | Health & social care | 2022 |
| Malabij Properties Limited | Real estate | 2025 |
| Maladh Lodge Limited | Real estate | 2025 |
| Malawian Coffee Company Limited | Wholesale & retail | 2018 |
| Malbeck Developments Ltd | Construction | 2021 |
| Malbeck Properties Ltd | Real estate | 2026 |
| Malben Engineering Ltd | Professional & scientific | 2023 |
| Malcolm Engineering Company (Darlington) Limited | Manufacturing | 1968 |
| Malcolm Johnstone - Aquaculture Consulting Ltd | Professional & scientific | 2024 |
| Malcolm Jones & Co Limited | Professional & scientific | 2006 |
| Malcolm Jones & Co LLP | | 2008 |
| Malcolm Michaels Quality Butchers Limited | Wholesale & retail | 2015 |
| Malcolm Stuart Property Consultants LLP | | 2010 |
| Malcolm Wright Associates Limited | Wholesale & retail | 2016 |
| Maleehacosmetics Ltd | Wholesale & retail | 2023 |
| Malexia Ltd | Administrative & support | 2018 |
| Malgg Ltd | Other services | 2025 |
| Malhamdale's Giant Ltd | Hospitality | 2022 |
| Malibucreative Ltd | Professional & scientific | 2025 |
| Malic Distributions Limited | Wholesale & retail | 2025 |
| Malice Clothing Limited | Manufacturing | 2013 |
| Maligold Property Limited | Real estate | 2025 |
| Malik Holdings Limited | Financial services | 2009 |
| Malik N Sons Ltd | Wholesale & retail | 2023 |
| Malikandco Limited | Construction | 2016 |
| Malin Contractors Ltd | Construction | 2016 |
| Malina Consulting Ltd | Professional & scientific | 2025 |
| Malinka Express Limited | Wholesale & retail | 2023 |
| Malissa J. Collection Ltd. | Wholesale & retail | 2020 |
| Malixia Ltd | Wholesale & retail | 2026 |
| Malkanicus Research Ltd | Manufacturing | 2023 |
| Malkin Cardiology Limited | Health & social care | 2024 |
| Mallards House RTM Company Ltd | Real estate | 2011 |
| Malle Ventures Limited | Professional & scientific | 2014 |
| Mallinson and Wright Limited | Information & communication | 2025 |
| Mallory Park Limited | Extraterritorial | 1988 |
| Mallory Tech Limited | Wholesale & retail | 2023 |
| Mallowdramatic Ltd | Manufacturing | 2022 |
| Malo Consulting Ltd | Professional & scientific | 2021 |
| Maloney Lourd Financial Consultants Limited | Financial services | 2008 |
| Malovertos Hvurt Group Ltd | Information & communication | 2025 |
| Malt Group Ltd | Wholesale & retail | 2023 |
| Malt Shovel Court Management Company Limited | Households | 1987 |
| Maltabound Limited | Financial services | 1977 |
| Malthouse Lane Limited | Financial services | 2021 |
| Malthusian Trappist CIC | Wholesale & retail | 2020 |
| Malue Ltd | Information & communication | 2021 |
| Malvir Limited | Health & social care | 2024 |
| Malwiyya Holding Limited | Real estate | 2020 |
| Malwiyya HT Limited | Real estate | 2026 |
| Malwiyya Ltd | Real estate | 2013 |
| MAM Healthcare Services Limited | Administrative & support | 2019 |
| MAM Sham Ltd | Arts & recreation | 2017 |
| Mam(Garforth) Ltd | Professional & scientific | 2021 |
| Mama & CUB Limited | Wholesale & retail | 2025 |
| Mama MIA Convenience Store Ltd | Wholesale & retail | 2016 |
| Mama MIA Supermarket Ltd | Wholesale & retail | 2025 |
| Mama Moola Limited | Financial services | 2025 |
| Mama's Pizza (SPH) Ltd | Hospitality | 2022 |
| Mamas Pizzeria Leeds Ltd | Hospitality | 2019 |
| Mambo South Shields Ltd | Hospitality | 2022 |
| Mambos Express Ltd | Hospitality | 2021 |
| Mammal Digital Limited | Information & communication | 2018 |
| Mammalingua Language Services Limited | Education | 2003 |
| Mammy's Food Services Ltd | Hospitality | 2026 |
| Mampala Motors Limited | Wholesale & retail | 2024 |
| Mamsp Ltd | Other services | 2017 |
| Mamu Computing Limited | Information & communication | 2013 |
| MAN Cave Diecasts Ltd | Wholesale & retail | 2025 |
| MAN Developments (Yorkshire) Limited | Construction | 2017 |
| MAN Friday Ltd | Extraterritorial | 2016 |
| MAN Interactive Limited | Information & communication | 2009 |
| MAN Power Construction 10 Limited | Construction | 2025 |
| MAN V Roast Leeds Ltd | Hospitality | 2022 |
| MAN YIP Property Group Ltd | Real estate | 2019 |
| MAN-1 Limited | Wholesale & retail | 2026 |
| Mana Care Services Limited | Health & social care | 2026 |
| Mana Management Group Ltd | Real estate | 2025 |
| Mana Services FM Ltd | Administrative & support | 2022 |
| Managed Facilities Ltd | Information & communication | 2014 |
| Managed Printer Solutions Limited | Wholesale & retail | 2020 |
| Managed Service Alliance Limited | Information & communication | 2025 |
| Management Co 1 Limited | Real estate | 2023 |
| Management Solutions (Yorkshire) Ltd | Professional & scientific | 2025 |
| Manager Unique Ltd | Wholesale & retail | 2023 |
| Managing Excellence Limited | Professional & scientific | 2026 |
| Manam Restaurants Ltd | Hospitality | 2025 |
| Manan Testing Services Limited | Information & communication | 2014 |
| Manati Bespoke Ltd | Wholesale & retail | 2016 |
| Manchester Breast Surgery Limited | Health & social care | 2022 |
| Manchester Construction Financial Consultancy Ltd | Professional & scientific | 2013 |
| Manchester DEV One LLP | | 2009 |
| Manchester Education Consult Ltd | Wholesale & retail | 2025 |