| Lutos Property Limited | Hospitality | 2025 |
| Luxe Living by Aldred Limited | Wholesale & retail | 2024 |
| Luxentage Cosmetics Ltd | Wholesale & retail | 2026 |
| Luxeway Ltd | Transport & logistics | 2025 |
| Luxhaven Properties Ltd | Hospitality | 2023 |
| Luxiva Ltd | Manufacturing | 2020 |
| Luxo Cars Ltd | Wholesale & retail | 2022 |
| Luxo Property Ltd | Real estate | 2023 |
| Luxus Aroma Ltd | Wholesale & retail | 2023 |
| Luxyfort Ltd | Information & communication | 2025 |
| Lv-Smith&Co Ltd | Administrative & support | 2025 |
| LW Plumbing & Heating Ltd | Construction | 2023 |
| LWO Roofing & Services Ltd | Construction | 2023 |
| Lydney Phase 1A and B Management Company Limited | Households | 2012 |
| Lyfat Essentials Ltd | Wholesale & retail | 2025 |
| Lyls Projects Ltd | Construction | 2026 |
| Lynch & Daly Holdings Ltd | Professional & scientific | 2024 |
| Lyncia Ltd | Health & social care | 2023 |
| Lynton Grange (Management) Limited | Professional & scientific | 1967 |
| Lynx Properties Limited | Real estate | 2017 |
| Lynx Renovation Ltd | Construction | 2022 |
| Lyon Cole Holdings Limited | Financial services | 2020 |
| Lysander Place Thamesmead (NO 1) Management Company Limited | Households | 2003 |
| Lyvia Electrical Limited | Wholesale & retail | 1964 |
| LZE & SON Limited | Other services | 2020 |
| LZE Limited | Administrative & support | 2014 |
| M & J Tree and Landscapes Limited | Administrative & support | 2022 |
| M & S Sushi House Ltd | Hospitality | 2026 |
| M &G Fixing Ltd | Construction | 2017 |
| M C Holiday Lets Ltd | Hospitality | 2024 |
| M Harper Ltd | Other services | 2022 |
| M L Rice Limited | Wholesale & retail | 2007 |
| M M S Healthcare Ltd | Health & social care | 2023 |
| M Patch Building & Roofing Ltd | Construction | 2023 |
| M Payne Roofing Limited | Construction | 2025 |
| M R Automotive Ltd | Administrative & support | 2007 |
| M Renford Properties Limited | Real estate | 2025 |
| M Smith Construction Ltd | Construction | 2021 |
| M T P Groundworks Ltd | Construction | 2025 |
| M Taylor’S Paving & Landscapes Ltd | Construction | 2021 |
| M W S Handyman Ltd | Construction | 2025 |
| M&D Property Development Group Ltd | Construction | 2024 |
| M&G Drylining and Ceiling Ltd | Construction | 2016 |
| M&K Services (UK) Limited | Construction | 2012 |
| M&M Classic Care Ltd | Health & social care | 2023 |
| M&R Interior Design Ltd | Construction | 2025 |
| M&S Motor Services Ltd | Wholesale & retail | 2021 |
| M&Y Construction Ltd | Construction | 2016 |
| M&Z Angels Ltd | Professional & scientific | 2021 |
| M&Z Upgrades Limited | Professional & scientific | 2023 |
| M-R Makes IT Ltd | Arts & recreation | 2025 |
| M.A.G. Properties Services Holdings Limited | Financial services | 2025 |
| M.A.G. Properties Services Limited | Construction | 1999 |
| M.D.G Mould & Damp Ltd | Construction | 2025 |
| M.E.S. Plumbing & Heating Services Ltd | Construction | 2019 |
| M.J Property Holdings Ltd | Real estate | 2023 |
| M.L Steel Fabrication Ltd | Manufacturing | 2026 |
| M.R. Cafe Limited | Hospitality | 2024 |
| M.T.P Cleaning Services Ltd | Administrative & support | 2022 |
| M10 Computing Limited | Information & communication | 2016 |
| M11 Mobile Tyres & Repairs Ltd | Wholesale & retail | 2025 |
| M11 Plumbing & Heating Limited | Construction | 2024 |
| M4 Diffusion Ltd | Wholesale & retail | 2018 |
| M4 Petroleum & Logistics Limited | Professional & scientific | 2012 |
| MA George Williams Ltd | Professional & scientific | 2011 |
| MA Tilling and Construction Ltd | Construction | 2026 |
| Ma&A Carpentry Ltd | Manufacturing | 2020 |
| Ma&A Cars Ltd | Wholesale & retail | 2023 |
| Ma&A Invest Ltd | Real estate | 2025 |
| Maatmann Limited | Professional & scientific | 2015 |
| Mabeline Services Ltd. | Health & social care | 2017 |
| MAC & Gaff Properties Ltd | Manufacturing | 2021 |
| Mac-Hc Ltd | Health & social care | 2026 |
| Mace and Lace Consultancy Limited | Administrative & support | 2014 |
| Mack Building Services Ltd | Construction | 2016 |
| Mackie AL Original Ltd | Transport & logistics | 2025 |
| MAD G Solutions Ltd | Information & communication | 2024 |
| MAD Hatters BJJ Ltd | Arts & recreation | 2021 |
| MAD Property Services Ltd | Real estate | 2026 |
| Mada Group Limited | Manufacturing | 2018 |
| Madam SIN Ltd | Manufacturing | 2018 |
| Madame Ltd. | Manufacturing | 2019 |
| Madana Construction Limited | Construction | 2021 |
| Madana Homes Limited | Real estate | 2025 |
| Madana Ltd | Construction | 2021 |
| Made by 68 Limited | Manufacturing | 2013 |
| Madison Filter 981 Limited | Financial services | 1999 |
| Madison Rentals Limited | Real estate | 2020 |
| Madolat Service Ltd | Administrative & support | 2019 |
| Madotsons Limited | Health & social care | 2010 |
| Madox Estates Ltd | Real estate | 2012 |
| Madox Mill Ltd | Wholesale & retail | 2025 |
| Madrasah 360 CIC | Health & social care | 2023 |
| Maduna Limited | Health & social care | 2018 |
| Magic BEE Cleaning Limited | Administrative & support | 2019 |
| Magic Touch Photography Ltd | Professional & scientific | 2024 |
| Magnanimous Limited | Administrative & support | 2020 |
| Magnatrak Limited | Wholesale & retail | 2019 |
| Magri Flooring Limited | Construction | 2025 |
| Maher Investments Ltd | Financial services | 2024 |