| LS Principals Ltd. | Information & communication | 2014 |
| LS Property Assets Limited | Real estate | 2021 |
| LSB Beauty Limited | Other services | 2026 |
| LSB Consultancy Group Limited | Professional & scientific | 2026 |
| LSE Holdings Ltd | Financial services | 2017 |
| LT Rising Properties Limited | Real estate | 2021 |
| LTS Design & Build Limited | Construction | 2001 |
| Lubechem Experts Ltd | Professional & scientific | 2025 |
| Luca Property Ltd | Households | 2020 |
| Lucas Wood Property Services Ltd | Real estate | 2025 |
| Lucid (the Clearer Group) Limited | Professional & scientific | 2010 |
| Lucid Holdings Limited | Wholesale & retail | 2024 |
| Lucky 7 Stars Ltd | Wholesale & retail | 2017 |
| Lucky Food and Wine Ltd | Wholesale & retail | 2026 |
| Lucky Star Property Ltd | Real estate | 2017 |
| Lucrum Mortgage Solutions Limited | Financial services | 2025 |
| Lucy Bingham PR Limited | Professional & scientific | 2023 |
| Lucy Foster Medi Clinic Ltd | Other services | 2024 |
| Lucyg Ventures Limited | Wholesale & retail | 2024 |
| Lugis Limited | Hospitality | 2012 |
| Luke Scaffolding Birmingham Ltd | Construction | 2011 |
| Lumare Group Ltd | Construction | 2025 |
| Lumidor Ltd | Wholesale & retail | 2020 |
| Luminous Pathways CIC | Education | 2024 |
| Lunar Agency Ltd | Professional & scientific | 2025 |
| Lunar Archer Limited | Real estate | 2024 |
| Lunar Digital Ltd | Professional & scientific | 2025 |
| Lunar Ltd | Professional & scientific | 2023 |
| Lunar P.E.O Ltd | Professional & scientific | 2025 |
| Lunarlo Properties Limited | Real estate | 2025 |
| Luttrell Homes (Shropshire) Limited | Construction | 2011 |
| Luttrell House Ltd | Real estate | 2026 |
| LUX Living Group Ltd | Wholesale & retail | 2025 |
| LUX Lounge Birmingham Ltd | Hospitality | 2024 |
| Luxelease Ltd | Real estate | 2026 |
| Luxeqalb Ltd | Real estate | 2024 |
| Luxlet Properties Ltd | Real estate | 2026 |
| Luxury Prestige Hire Ltd | Administrative & support | 2022 |
| Luxury Radiators Limited | Wholesale & retail | 2024 |
| LV Nails Sutton Ltd | Other services | 2025 |
| LX Group Limited | Professional & scientific | 2017 |
| Lycoris Properties Limited | Real estate | 2023 |
| Lydia Property Group Ltd | Real estate | 2022 |
| Lync Direct Limited | Wholesale & retail | 2013 |
| Lynks Ltd | Construction | 2024 |
| Lyon Heart Care Ltd | Health & social care | 2025 |
| Lyon Heart United CIC | Education | 2025 |
| Lyttle Foods Limited | Hospitality | 2024 |
| M & a Universal Ltd | Hospitality | 2025 |
| M & H Transport Services Limited | Transport & logistics | 2006 |
| M & J Bloom Limited | Health & social care | 2021 |
| M & M Verma Limited | Health & social care | 2015 |
| M & R Optical Ltd | Administrative & support | 2016 |
| M & S Developments (Bemrose Court) Limited | Construction | 2015 |
| M & S Developments Holdings Limited | Construction | 2016 |
| M & W Housing Ltd | Hospitality | 2010 |
| M a Chhokar Ltd | Transport & logistics | 2013 |
| M a Consulting Ltd | Wholesale & retail | 2016 |
| M a Rogers Construction Limited | Construction | 2005 |
| M and J Gallagher Brickwork Ltd | Construction | 2017 |
| M D H Central Limited | Other services | 2013 |
| M D Phillips Civil Engineering Ltd | Administrative & support | 2016 |
| M Downey Plumbing and Heating Limited | Construction | 2013 |
| M E and T Stockport Ltd | Hospitality | 2025 |
| M E J Consulting Limited | Information & communication | 2011 |
| M Fowler Consulting Limited | Professional & scientific | 2019 |
| M Hijazi Ltd | Health & social care | 2025 |
| M I Estates (2023) Limited | Real estate | 2023 |
| M J Evans Limited | Professional & scientific | 2018 |
| M J Holdings Group Ltd | Financial services | 2026 |
| M Kaypee Holding Ltd | Financial services | 2026 |
| M L Mccrohon Associates Ltd | Education | 2018 |
| M Mirza Ltd | Health & social care | 2024 |
| M N Properties (Midlands) Limited | Real estate | 2019 |
| M P Building and Carpentry Limited | Construction | 2003 |
| M P Jones Limited | Wholesale & retail | 2018 |
| M S & R S Property Limited | Real estate | 2024 |
| M S Properties Investment Ltd | Real estate | 2016 |
| M Squared Building Services Ltd | Construction | 2020 |
| M Squared Building Services Midlands Ltd | Construction | 2025 |
| M W Business Consultancy Limited | Professional & scientific | 2018 |
| M Whitehouse Properties Ltd | Real estate | 2023 |
| M&A Custom Designs Ltd | Wholesale & retail | 2024 |
| M&E N Property LLP | | 2023 |
| M&F Pizza Ltd | Hospitality | 2023 |
| M&M Business Management Ltd | Professional & scientific | 2026 |
| M&M Graphite UK Ltd | Mining & quarrying | 2026 |
| M&M Mining International Ltd | Mining & quarrying | 2025 |
| M&M Physio Care Ltd | Other services | 2025 |
| M&M Powell Properties LLP | | 2012 |
| M&N Property Services (UK) Limited | Construction | 2008 |
| M&Ph Properties Ltd | Real estate | 2020 |
| M&R Pizza Ltd | Hospitality | 2024 |
| M. Cruise Plumbing Ltd. | Construction | 2009 |
| M.B.D. (Europe) Limited | Professional & scientific | 2016 |
| M.C.B Electrical Contracts Ltd. | Construction | 2019 |
| M.D.M. Systems Limited | Information & communication | 1998 |
| M.E. Architects Ltd | Professional & scientific | 2001 |
| M.J. One Limited | Real estate | 1998 |
| M.J. Yates (Tools) & Co. Limited | | 1973 |