| Lydianour Limited | Manufacturing | 2023 |
| Lymro Enterprises Ltd | Real estate | 2013 |
| Lynnwood Company Limited | Wholesale & retail | 2024 |
| Lyra Express Ltd | Wholesale & retail | 2021 |
| Lzbproperties Ltd | Real estate | 2026 |
| M and D Ltd | Wholesale & retail | 2025 |
| M&I Transfers Ltd | Transport & logistics | 2026 |
| M&S Studios Ltd | Information & communication | 2025 |
| M.E.R.D Property Ltd | Real estate | 2022 |
| M3H Developments Ltd | Construction | 2024 |
| MAB Builds Ltd | Construction | 2025 |
| Macabral Ltd | Wholesale & retail | 2025 |
| Mackey Technical Services UK Limited | Construction | 2020 |
| Madaan'Z Ltd. | Wholesale & retail | 2012 |
| Madaanz Investment Ltd | Real estate | 2024 |
| Madison Auto Solutions Limited | Professional & scientific | 2011 |
| Magenta Property Services Ltd | Construction | 2026 |
| Magicwood Internals Ltd | Manufacturing | 2025 |
| Mahad Consultants Limited | Professional & scientific | 2014 |
| Mahtabi Budget Ltd | Wholesale & retail | 2022 |
| Maja Corner Ltd | Wholesale & retail | 2021 |
| Maja Deli Ltd | Wholesale & retail | 2015 |
| Maja Polish Shop Limited | Wholesale & retail | 2010 |
| Majh Limited | Wholesale & retail | 2025 |
| Makkah Madinah Limited | Administrative & support | 2024 |
| Malin Trans Ltd | Transport & logistics | 2015 |
| Malis Beauty Ltd | Other services | 2024 |
| Malviya Innovations Limited | Wholesale & retail | 2024 |
| Malwa Logistics Group Ltd | Transport & logistics | 2024 |
| Mamma Miaa Ltd | Hospitality | 2025 |
| Manage at Home Limited | Extraterritorial | 2010 |
| Manage My Build Limited | Professional & scientific | 2024 |
| Manage Prestige Properties Ltd | Real estate | 2025 |
| Manchanda Logistics Ltd | Transport & logistics | 2026 |
| Mandriving Ltd | Transport & logistics | 2022 |
| Manipula Protect Limited | Wholesale & retail | 2022 |
| Manmeet Stores Ltd | Wholesale & retail | 2026 |
| Manna Design & Build Ltd | Construction | 2026 |
| Mantra Two Limited | Other services | 2011 |
| Manzilian Ltd | Other services | 2013 |
| Maple & Bell Immigration Consultants Ltd | Professional & scientific | 2023 |
| Marcom Trade Ltd | Wholesale & retail | 2022 |
| Maritex Holdings Limited | Financial services | 2025 |
| Marjan Real Estate Ltd | Real estate | 2025 |
| Mark Birch Hair Ltd | Wholesale & retail | 2018 |
| Mark Windows Glaze Ltd | Construction | 2024 |
| Markdejesus Limited | Health & social care | 2020 |
| Market Choice Limited | Wholesale & retail | 2020 |
| Mars Electronics FZC Ltd | Information & communication | 2021 |
| Mart Network Solutions Limited | Information & communication | 2000 |
| Marvel Cleaning Limited | Administrative & support | 2022 |
| MAS 2017 Ltd | Other services | 2017 |
| MAS Living Ltd | Real estate | 2022 |
| Mascade Ltd | Transport & logistics | 2025 |
| Mason-Thompson Limited | Wholesale & retail | 2005 |
| Masonwood Property Ltd | Real estate | 2019 |
| Massi Bodyworks Ltd | Wholesale & retail | 2018 |
| Master Ways Joinery Ltd | Manufacturing | 2026 |
| MAT Property Solutions Limited | Real estate | 2026 |
| Matador Sports Ltd | Wholesale & retail | 2022 |
| Mathematically Speaking Ltd | Professional & scientific | 2018 |
| Matsya Pinner Limited | Hospitality | 2020 |
| Maximusuk Ltd | Wholesale & retail | 2024 |
| Mayfair Investments & Asset Management Ltd | Real estate | 2020 |
| Mazise Care Services 2023 Limited | Health & social care | 2023 |
| Mazyoun Ltd | Administrative & support | 2025 |
| MBP Trade Ltd | Wholesale & retail | 2025 |
| MBR Associates International Group Ltd | Wholesale & retail | 2018 |
| MC Matheos Limited | Construction | 2022 |
| MC Tax and Accountancy Ltd | Professional & scientific | 2023 |
| MC Transport Ltd | Transport & logistics | 2023 |
| Mccann-Hartono (Trading AS Studybond) Ltd | Professional & scientific | 2022 |
| Mcdaid Bros Group Ltd | Construction | 2007 |
| Mcguire Electrical Ltd | Construction | 2021 |
| MCO Tax Digital Ltd | Professional & scientific | 2023 |
| MD Brickwork (London) Limited | Construction | 2022 |
| MD Developments (London) Limited | Construction | 2007 |
| MD Holdings (London) Limited | Financial services | 2018 |
| MD Prime Ltd | Other services | 2019 |
| MD Properties (London) Limited | Other services | 2018 |
| MD Residential (London) Limited | Real estate | 2019 |
| MD Scaffolding (London) Limited | Construction | 2025 |
| MD Scaffolding Limited | Construction | 2015 |
| MD Shield Holdings Limited | Financial services | 2020 |
| MD Transport & Haulage Limited | Transport & logistics | 2016 |
| MD3 Experts Ltd | Hospitality | 2024 |
| Mda&Sons Limited | Hospitality | 2025 |
| MDW Designs Limited | Professional & scientific | 2013 |
| Meadcoates PUB Ltd | Hospitality | 2019 |
| Meadow Cabins Ltd | Real estate | 2021 |
| MECHATRONIC247 Ltd | Manufacturing | 2023 |
| Medequip Assistive Technology Limited | Wholesale & retail | 2001 |
| Medequip Group Limited | Wholesale & retail | 2015 |
| Medequip Holdings Limited | Wholesale & retail | 2018 |
| Meditalia Food Ltd | Hospitality | 2013 |
| Medsan Consultancy Ltd. | Information & communication | 2013 |
| Meeking Carpentry Services Ltd | Information & communication | 2022 |
| Mehk Group Limited | Administrative & support | 2025 |
| Mehraj Consultancy Limited | Information & communication | 2022 |
| Melanddean Ltd | Health & social care | 2012 |