| Levy Heart Health Limited | Health & social care | 2011 |
| LF Plumbing & Heating Limited | Construction | 2023 |
| Lifetrend Developments (Southern) Limited | Professional & scientific | 1987 |
| Lifetrend Developments Limited | Construction | 1987 |
| Lifetrend Homes Limited | Professional & scientific | 1988 |
| Lifetrend Leisure Limited | Professional & scientific | 1988 |
| Lifetrend Retirement Homes Limited | Professional & scientific | 1987 |
| Little Fields Family Company | Financial services | 2019 |
| Little Paddocks Farm Limited | Agriculture & fishing | 2018 |
| LJS Dental Limited | Other services | 2017 |
| Long Dog Lettings Ltd | Real estate | 2024 |
| Ludan Group Ltd | Health & social care | 2019 |
| Luna Customs LLP | | 2018 |
| Luxe Lawns Ltd | Households | 2005 |
| Luxury Villa Living Ltd | Administrative & support | 2009 |
| Lwfitt Ltd | Arts & recreation | 2015 |
| Lyme Green Business Park Limited | Real estate | 1987 |
| Lynton Court Management Limited | Households | 1973 |
| M27 Boxing & Fitness Ltd | Arts & recreation | 2024 |
| M27 Gym Ltd | Arts & recreation | 2025 |
| Macclesfield Means Business CIC | Other services | 2019 |
| Machin Ludman Properties Limited | Real estate | 2018 |
| Machine Tool Recruitment Limited | Administrative & support | 2012 |
| Mainstream Live Limited | Arts & recreation | 2020 |
| Malcolm Ross & Sons Limited | Wholesale & retail | 2006 |
| Manchester (Port Street) Limited | Real estate | 2021 |
| Manchester Charles Street Residential (ELP GP) Limited | Administrative & support | 2017 |
| Manchester Charles Street Residential ELP Nominee Limited | Administrative & support | 2017 |
| Manchester Charles Street Residential English Limited Partnership | | 2017 |
| Manchester Charles Street Residential SLP Nominee Limited | Administrative & support | 2017 |
| Manchester Girls FC Ltd | Education | 2025 |
| Manchester Road Projects Ltd | Construction | 2023 |
| Mandrill Protein Ltd | Wholesale & retail | 2024 |
| Mara Management Consultants Ltd | Administrative & support | 2016 |
| Maroc Motors Ltd | Wholesale & retail | 2025 |
| Masa Catering & Restaurant Limited | Other services | 2020 |
| Material Ventures Ltd | Information & communication | 2021 |
| Matrix Healthcare Group Limited | Financial services | 2024 |
| Matrix Healthcare Limited | Wholesale & retail | 2019 |
| Matrix Healthcare Solutions Limited | Wholesale & retail | 2016 |
| Maxwellia Ltd | Wholesale & retail | 2013 |
| MC & LAC Properties Limited | Real estate | 2024 |
| Mccafferty Asset Management 1ST Ltd | Real estate | 2018 |
| Mcinnes Consulting Limited | Professional & scientific | 2000 |
| Mcs(International) Ltd | Wholesale & retail | 2010 |
| MDS Football Operations Limited | Arts & recreation | 2021 |
| Meccanica Coritani Limited | Wholesale & retail | 2013 |
| Medi-Smart Billing Ltd | Health & social care | 2025 |
| Medical Aesthetics by DR Andre Ltd | Health & social care | 2018 |
| Medispa Cheshire Limited | Other services | 2019 |
| Meir Properties Limited | Real estate | 2017 |
| Melanie HAY Property Limited | Real estate | 2015 |
| Melbourne West Limited | Professional & scientific | 2018 |
| Melling & Co Limited | Professional & scientific | 2025 |
| Merica Solutions Ltd | Administrative & support | 2024 |
| Mersey Hire Properties Limited | Real estate | 2006 |
| Metier Management Limited | Real estate | 2015 |
| MGM Property (London) Limited | Real estate | 2018 |
| Michael O'Shea Dispute Resolution Services Limited | Administrative & support | 2024 |
| Michelle Murren Hair Limited | Other services | 2024 |
| Middlebrook Business Park Limited | Professional & scientific | 1996 |
| Middlebrook Horwich Limited | Professional & scientific | 1996 |
| Middlebrook Securities Limited | Construction | 2016 |
| Mill Lane Land Ltd | Real estate | 2024 |
| Mills Commercial Finance Limited | Financial services | 2021 |
| Miss Decor Ltd | Professional & scientific | 2025 |
| Mjbp Holdings Ltd | Administrative & support | 2024 |
| Momentous Learning Limited | Education | 2024 |
| Momo Properties and Hotels Ltd | Hospitality | 2023 |
| Mont PHG Ltd | Construction | 2026 |
| Morgan Kigen Ltd | Other services | 2018 |
| Morgan Stewart Developments Limited | Real estate | 1996 |
| Mount Crescent Ltd | Construction | 2015 |
| Mountaingaze Limited | Professional & scientific | 2003 |
| MP Finance Limited | Professional & scientific | 2025 |
| Murfield (Properties) Limited | Real estate | 1968 |
| My Happy Mind Limited | Education | 2014 |
| Mycarepilot Ltd | Information & communication | 2026 |
| Nabaile Properties Limited | Real estate | 2020 |
| Nabaile Young Limited | Education | 2005 |
| Nansen Property Group Ltd | Real estate | 2025 |
| National Data Limited | Professional & scientific | 2011 |
| Ndtc Properties Ltd | Real estate | 2025 |
| NEKI2GO Limited | Hospitality | 2026 |
| Netvantage Limited | Professional & scientific | 2024 |
| New Road Homes Limited | Construction | 2024 |
| Newco Investments Limited | Financial services | 2022 |
| Newfield Care Ltd | Professional & scientific | 1987 |
| Newfield Construction Limited | Construction | 2015 |
| Newfield Investments Limited | Professional & scientific | 1992 |
| Newfield Jones Homes Limited | Professional & scientific | 1997 |
| Newfield Management Services Limited | Households | 2000 |
| NG Wealth Limited | Financial services | 2025 |
| Nickham Ventures Limited | Professional & scientific | 2025 |
| Ninth Phase Limited | Professional & scientific | 2024 |
| Nolyna Ltd | Wholesale & retail | 2025 |
| North West Development Properties Limited | Professional & scientific | 1990 |
| North West Portfolio (NO.2) Limited | Construction | 2013 |
| North West Portfolio (NO.3) Limited | Construction | 2016 |
| North West Portfolio (NO.4) Limited | Real estate | 2015 |