| Lumina Logic Partners Ltd | Administrative & support | 2014 |
| Luxehive Online Ltd | Wholesale & retail | 2020 |
| Luxury Clean & Tidy Services Ltd | Administrative & support | 2022 |
| LV Pipe Work Services Ltd | Manufacturing | 2024 |
| LW Interiors Ltd | Construction | 2026 |
| Lytham Caravans Ltd | Hospitality | 2025 |
| Lyttleton Grange Management Company Limited | Households | 2015 |
| M & J Haulage (Midlands) Limited | Transport & logistics | 2006 |
| M & S Window Cleaning Services Ltd | Administrative & support | 2020 |
| M a Galaxy INT UK Ltd | Other services | 2021 |
| M a Installations & Service Limited | Construction | 2016 |
| M and S Renewables Ltd | Construction | 2020 |
| M C Fencing Ltd | Administrative & support | 2015 |
| M Clapson Ltd | Construction | 2014 |
| M E Laud Services Limited | Construction | 2001 |
| M I Bespoke Joinery Ltd | Construction | 2022 |
| M J Hill Transport Limited | Transport & logistics | 2003 |
| M J O'Donnell Holdings Limited | Professional & scientific | 2016 |
| M J Sansom Ltd | Professional & scientific | 2013 |
| M L Operations Ltd | Manufacturing | 2012 |
| M L Real Estate Ltd | Real estate | 2012 |
| M R Fence Maintenance Services Limited | Construction | 2025 |
| M Rusu Trans Limited | Transport & logistics | 2016 |
| M S Horton Limited | Other services | 2013 |
| M.A.N.Engineering Ltd | Manufacturing | 2021 |
| M.C. Driver Hire Limited | Transport & logistics | 2016 |
| M.J.M. Plumbing & Heating Services (Midlands) Limited | Construction | 2003 |
| M@Rfi Ltd | Transport & logistics | 2021 |
| MAC & Flynn Construction Ltd | Construction | 2019 |
| MAC Building & Kitchen Services Ltd | Construction | 2023 |
| Macaw Cocktails Ltd | Hospitality | 2025 |
| MACK3 Engineering Ltd | Professional & scientific | 2020 |
| Mackworth Developments Limited | Real estate | 1972 |
| Macstay Limited | Real estate | 2019 |
| Madina Bakery U.K Ltd | Wholesale & retail | 2019 |
| MAE Property Investments Ltd | Real estate | 2024 |
| Mage Qualifications Limited | Education | 2023 |
| Magnets Direct Ltd | Extraterritorial | 2022 |
| Magnus Fire Protection Ltd | Construction | 2023 |
| Mahtal Ltd | Administrative & support | 2022 |
| Maji Comprehensive Health Limited | Health & social care | 2025 |
| Majk Property Ltd | Real estate | 2025 |
| Mander Consulting Ltd | Professional & scientific | 2026 |
| Mandy Sidhu Limited | Administrative & support | 2011 |
| Mane and Soul Limited | Other services | 2024 |
| Mangrosafety Ltd | Professional & scientific | 2022 |
| Manhattans Ashby Limited | Hospitality | 2024 |
| Mann Realty Ltd | Real estate | 2025 |
| Manor Farm (Tugby) Management Company Limited | Households | 2016 |
| Manor Vale Residents Management Company Limited | Households | 2018 |
| Manor View (Hartshorne) Management Company Limited | Households | 2006 |
| Manpower Event Services Ltd | Arts & recreation | 2019 |
| Manston Place Holdings Limited | Professional & scientific | 1969 |
| Manufacturing Management Services Ltd | Professional & scientific | 2019 |
| Maple (307) Limited | Households | 2007 |
| Maple (329) Limited | Households | 2007 |
| Maple (338) Limited | Households | 2008 |
| Maple (342) Limited | Households | 2008 |
| Maple (364) Limited | Households | 2011 |
| Maple (371) Limited | Households | 2013 |
| Maple (378) Limited | Households | 2014 |
| Maple (379) Limited | Households | 2014 |
| Maple (384) Limited | Households | 2014 |
| Maple (397) Limited | Households | 2015 |
| Maple (398) Limited | Households | 2015 |
| Maple (401) Limited | Households | 2015 |
| Maple (403) Limited | Households | 2015 |
| Maple (405) Limited | Households | 2015 |
| Maple (406) Limited | Households | 2016 |
| Maple (407) Limited | Households | 2016 |
| Maple (410) Limited | Households | 2016 |
| Maple (414) Limited | Households | 2016 |
| Maple (415) Limited | Households | 2017 |
| Maple (416) Limited | Households | 2017 |
| Maple (421) Limited | Households | 2017 |
| Maple (424) Limited | Households | 2017 |
| Maple (425) Limited | Households | 2017 |
| Maple (431) Limited | Households | 2018 |
| Maple (436) Limited | Households | 2018 |
| Maple (440) Limited | Households | 2018 |
| Maple (451) Limited | Households | 2019 |
| Maple (464) Limited | Households | 2020 |
| Maple (465) Limited | Households | 2020 |
| Maple (470) Limited | Households | 2021 |
| Maple (474) Limited | Households | 2022 |
| Maple (475) Limited | Households | 2022 |
| Maple (477) Limited | Households | 2022 |
| Maple (478) Limited | Households | 2022 |
| Maple (484) Limited | Households | 2022 |
| Maple Gardens Management Company Limited | Households | 2005 |
| Maple Tree Homes Ltd | Construction | 2014 |
| Margot Care Ltd | Professional & scientific | 2025 |
| Margot Development Group Ltd | Construction | 2022 |
| Margot Estates Ltd | Real estate | 2024 |
| Margot Homes Ltd | Construction | 2025 |
| Marios UK Pizza Ltd | Hospitality | 2024 |
| Mark G Fewtrell Ltd | Manufacturing | 2026 |
| Mark J Scott Limited | Construction | 2006 |
| Markham & Thomas Construction Ltd | Construction | 2026 |
| Marmo Training Ltd | Extraterritorial | 2020 |