| M&A Nagra Housing Limited | Real estate | 2024 |
| M&A Segal Enterprises Ltd | Manufacturing | 2024 |
| M&A Supply Ltd | Wholesale & retail | 2026 |
| M&B Legacy Ltd | Wholesale & retail | 2022 |
| M&B Premium Ltd | Construction | 2024 |
| M&D OFF Licence Ltd | Wholesale & retail | 2023 |
| M&D Trans Ltd | Transport & logistics | 2015 |
| M&D&M Solution Ltd | Transport & logistics | 2021 |
| M&E Global Trade Ltd | Wholesale & retail | 2023 |
| M&G Building Contracts Ltd | Construction | 2023 |
| M&J Congo Shop Ltd | Wholesale & retail | 2021 |
| M&J Recruit Ltd | Administrative & support | 2021 |
| M&K Retail Limited | Wholesale & retail | 2024 |
| M&K Structures Ltd | Construction | 2020 |
| M&L Auto Electrical Ltd | Wholesale & retail | 2024 |
| M&L James Properties Ltd | Real estate | 2022 |
| M&L Leicester Homes Ltd | Real estate | 2024 |
| M&M Arch Services Limited | Wholesale & retail | 2019 |
| M&M Facility Services Limited | Real estate | 2019 |
| M&M Home Decore Ltd | Construction | 2026 |
| M&M Property (Leic) Ltd | Real estate | 2016 |
| M&M Property (Oadby) Limited | Real estate | 2023 |
| M&M Seafood Ltd | Manufacturing | 2009 |
| M&M Square Ltd | Real estate | 2025 |
| M&MCONSTRUCTION1 Limited | Construction | 2025 |
| M&M’S Foods Limited | Hospitality | 2017 |
| M&N 4 Drive Limited | Transport & logistics | 2019 |
| M&N Patel Ltd | Real estate | 2021 |
| M&Op Holdings Limited | Financial services | 2022 |
| M&P Robotics Ltd | Wholesale & retail | 2026 |
| M&S 786 Limited | Other services | 2025 |
| M&S Alvis Ltd | Professional & scientific | 2019 |
| M&S Caring Group Ltd | Health & social care | 2025 |
| M&S Consulting Group Ltd | Professional & scientific | 2024 |
| M&S Turkish Barber Ltd | Other services | 2024 |
| M&S Ventures Limited | Wholesale & retail | 2016 |
| M&T Displays UK Ltd | Wholesale & retail | 2020 |
| M&T HGV Transport UK Ltd | Construction | 2014 |
| M&Y Shop Ltd | Wholesale & retail | 2026 |
| M'S Coffee Shop Limited | Hospitality | 2022 |
| M-Gicom Ltd | Wholesale & retail | 2025 |
| M-Print Ltd | Manufacturing | 1999 |
| M-Zayn Khan Ltd | Administrative & support | 2019 |
| M. & B. Laundrettes Limited | Other services | 1970 |
| M. C. Plant Limited | Administrative & support | 2003 |
| M. D. Freight Services Limited | Transport & logistics | 2015 |
| M. D. Import-Export Limited | Hospitality | 1999 |
| M. Jarvis (UK & Europe ) Ltd | Wholesale & retail | 2020 |
| M. LEE Limited | Professional & scientific | 1998 |
| M. Maken Service Ltd | Transport & logistics | 2022 |
| M. Wyles Electrical Contractors Limited | Construction | 2003 |
| M.A Home Solutions Ltd | Construction | 2025 |
| M.A Star Transport Ltd | Transport & logistics | 2018 |
| M.A. Textile Trading Company Limited | | 1980 |
| M.A.H.D Limited | Construction | 2026 |
| M.A.Poole Consultant Ltd | Manufacturing | 2022 |
| M.A.R.K Group (U.K) Limited | Hospitality | 2024 |
| M.Akoob (PTY) Ltd | Professional & scientific | 2019 |
| M.Ali Enterprises Ltd | Transport & logistics | 2018 |
| M.Baxter Biomass Consultancy Limited | Professional & scientific | 2011 |
| M.C. Construction UK Ltd. | Construction | 2008 |
| M.C.A.C. Electrical Limited | Construction | 2002 |
| M.C.E. Property (2025) Limited | Real estate | 2025 |
| M.D Frontline Marketing Ltd | Other services | 2019 |
| M.D. Transport Services UK 2202 Ltd | Transport & logistics | 2025 |
| M.D.S. Heating & Plumbing Limited | Construction | 2000 |
| M.E. Supplies (Electronics) Limited | Manufacturing | 1975 |
| M.E.D. Global Limited | Health & social care | 2023 |
| M.E.K. Commercials Limited | Wholesale & retail | 1996 |
| M.E.R Optical Solutions Limited | Wholesale & retail | 2011 |
| M.F. Consultancy Limited | Professional & scientific | 2000 |
| M.G Malegrooming Ltd | Other services | 2025 |
| M.G. Storer Ltd | Construction | 2010 |
| M.G.M. Boats Limited | Transport & logistics | 2019 |
| M.H.D. Enterprises (UK) Limited | Wholesale & retail | 1991 |
| M.Haych Cuts Ltd | Other services | 2023 |
| M.I & Sons Ltd | Real estate | 2014 |
| M.I. I Holdings Ltd | Financial services | 2020 |
| M.I.F & Sons Ltd | Transport & logistics | 2008 |
| M.Irshad Ltd | Health & social care | 2022 |
| M.J.A Enterprise Limited | Hospitality | 2020 |
| M.K. Builders Services Ltd | Construction | 2016 |
| M.K. Dentistry Limited | Health & social care | 2012 |
| M.M GAS Specialist Ltd | Construction | 2012 |
| M.O.I. Garments Limited | | 1979 |
| M.P. Stanline Limited | Construction | 2008 |
| M.P.E.S. Limited | Construction | 2005 |
| M.P.K. Filling Stations Limited | Wholesale & retail | 1996 |
| M.P.K. Group Limited | Professional & scientific | 2015 |
| M.R Design Studio Ltd | Professional & scientific | 2025 |
| M.R.A Supplies Ltd | Wholesale & retail | 2020 |
| M.R.I. Ophthalmic Services Ltd | Health & social care | 2011 |
| M.R.N Palmer Family Legacy Portfolio Limited | Financial services | 2025 |
| M.S Plumbing & Building Limited | Construction | 2019 |
| M.SELVI2020 Ltd | Hospitality | 2020 |
| M.Snutch Builders & Contractors Limited | Construction | 2016 |
| M.T. Horseracing Limited | Arts & recreation | 2003 |
| M.T.E. (Leicester) Limited | Construction | 1996 |
| M.T.Pharmatech Limited | Extraterritorial | 2006 |
| M.Turner Services Ltd | Administrative & support | 2005 |