| Lumex Tech Ltd | Construction | 2026 |
| Lumino Glassware Ltd | Wholesale & retail | 2025 |
| Lumira Medical Aesthetics Ltd | Health & social care | 2024 |
| Lumos-Uk Ltd | Manufacturing | 2024 |
| Luna-V Ltd | Real estate | 2006 |
| Lunar Medical Services Limited | Health & social care | 2024 |
| Lunar Spore Limited | Information & communication | 2025 |
| Lunovia Consulting Ltd | Administrative & support | 2024 |
| LUX Automotive Sourcing Limited | Wholesale & retail | 2013 |
| Luxe Live Ltd | Construction | 2023 |
| Luxehouse Enterprise Limited | Wholesale & retail | 2025 |
| LUXM1 Recruitment Limited | Agriculture & fishing | 2023 |
| LW Labs Ltd | Manufacturing | 2019 |
| Lydon Electrical Contractors Ltd | Construction | 2015 |
| Lynam Property Holdings Ltd | Real estate | 2025 |
| Lyndon Close Ltd | Extraterritorial | 2017 |
| Lyndon Transport Co.Limited | Wholesale & retail | 1960 |
| Lynfield Property Investments Limited | Real estate | 2016 |
| Lynn Construction Limited | Construction | 2002 |
| Lynn Holdings Limited | Real estate | 2022 |
| M & AS Properties Limited | Real estate | 2019 |
| M & L Automotive Ltd | Wholesale & retail | 2020 |
| M & N Plastering and Drylining Limited | Construction | 2015 |
| M & P (Notts) Limited | Professional & scientific | 2021 |
| M & TP Property Investments Ltd | Real estate | 2022 |
| M a Motor Company Limited | Wholesale & retail | 2006 |
| M a Zain Ltd | Hospitality | 2025 |
| M and G Electrical Contractors Limited | Construction | 2006 |
| M and J Motor Company Limited | Wholesale & retail | 2024 |
| M B Paving Ltd | Construction | 2015 |
| M Bargains (SY) Limited | Wholesale & retail | 2026 |
| M Bernard Limited | Wholesale & retail | 2016 |
| M Competitions Ltd | Other services | 2025 |
| M D Slack Wealth Management Ltd | Professional & scientific | 2020 |
| M Dunn Training Ltd | Education | 2021 |
| M Edwards Ltd | Professional & scientific | 2023 |
| M Howell Investments Ltd | Real estate | 2022 |
| M J Green Services Ltd | Construction | 2008 |
| M J Storey Holdings Limited | Extraterritorial | 2014 |
| M K Lally Ltd | Wholesale & retail | 2016 |
| M Moore Industrial Cleaners Limited | Administrative & support | 2003 |
| M P R Electric Gates Limited | Manufacturing | 2007 |
| M Parnell Ltd | Real estate | 2024 |
| M T & C Care Consultancy Limited | Health & social care | 2013 |
| M Y Properties (Notts) Limited | Real estate | 2024 |
| M&A Business Services Ltd | Professional & scientific | 2014 |
| M&A Mansfield Ltd | Wholesale & retail | 2024 |
| M&D Business Operations Ltd | Professional & scientific | 2025 |
| M&E Assets Holdings (UK) Ltd | Real estate | 2012 |
| M&E Property Holdings (UK) Ltd | Real estate | 2007 |
| M&E Traders Ltd | Wholesale & retail | 2025 |
| M&Fc Trading Limited | Wholesale & retail | 2022 |
| M&Gs Properties Limited | Real estate | 2023 |
| M&J Asset Development Ltd | Wholesale & retail | 2026 |
| M&L Automotive (Clipstone) Ltd | Wholesale & retail | 2026 |
| M&S Local Limited | Wholesale & retail | 2013 |
| M&S PVT Ltd | Wholesale & retail | 2023 |
| M&V Driveways Ltd | Construction | 2021 |
| M'Dame Priti Limited | Other services | 2018 |
| M-Clad Consultants Ltd | Professional & scientific | 2026 |
| M. Braun UK Ltd | Wholesale & retail | 2009 |
| M. R. BMS Solutions Ltd | Information & communication | 2013 |
| M.A.V. Building Contractors Ltd | Construction | 2008 |
| M.J. Robinson (Mechanical Services) Limited | Real estate | 2006 |
| M.J.Robinson Limited | Construction | 1968 |
| M2U Logistics Limited | Transport & logistics | 2019 |
| M3 Changeparts Ltd | Manufacturing | 2005 |
| M3 Joinery Projects Limited | Manufacturing | 2026 |
| M4 Management Ltd | Information & communication | 2005 |
| MA Construction (Mansfield) Limited | Construction | 2024 |
| MA Retail Sales Services Ltd | Wholesale & retail | 2022 |
| Maaa Developments Limited | Real estate | 2014 |
| Macaulay Stevenson Engineering Ltd | Professional & scientific | 2018 |
| Mace Catering Ltd | Hospitality | 2026 |
| Macfloor Limited | Construction | 2013 |
| Machine Solutions Limited | Manufacturing | 2022 |
| Machwise Engineering Services Ltd | Professional & scientific | 2024 |
| Macpin Management Limited | Professional & scientific | 2010 |
| Maddie Rose Limited | Wholesale & retail | 2026 |
| Maddox Financial Solutions Ltd | Professional & scientific | 2017 |
| Madf Holdings Ltd | Households | 2020 |
| Madlec Limited | Construction | 2008 |
| Magdala FH Limited | Households | 2023 |
| Magenta 1859 Ltd | Financial services | 2011 |
| Magenta Financial Services Ltd | Financial services | 2005 |
| Magenta Phoenix Limited | Professional & scientific | 2017 |
| Magic Beans (Midlands) Limited | Education | 2016 |
| Magic Bullet Products Limited | Wholesale & retail | 2012 |
| Magic Coaching Ltd | Arts & recreation | 2015 |
| Maguire Business Solutions Limited | Administrative & support | 1999 |
| Maguire Training Limited | Extraterritorial | 2004 |
| Maid in Sheffield Limited | Administrative & support | 2002 |
| Maid Marian Limited | Hospitality | 2025 |
| Maid Marian Takeaway Ltd | Hospitality | 2018 |
| Maid Marion Nottingham Limited | Wholesale & retail | 2018 |
| MAID2CLEAN (Barnsley) Ltd | Households | 2015 |
| Maison DU Pain Limited | Manufacturing | 2025 |
| Major Oak Homes Limited | Real estate | 2024 |
| Major Oak Property People Ltd | Real estate | 2021 |
| Major Oak Software Ltd | Information & communication | 2012 |