| L&E Prime Properties Ltd | Real estate | 2025 |
| Landmark Ecology Ltd | Professional & scientific | 2014 |
| Landscape&Building Supplies Ltd | Wholesale & retail | 2026 |
| Langdon & Poplar Ltd | Professional & scientific | 2023 |
| LD Lets Ltd | Real estate | 2023 |
| LE Motorcycles Ltd | Wholesale & retail | 2023 |
| LE Retail Ltd | Wholesale & retail | 2019 |
| Leavlite Limited | Extraterritorial | 1963 |
| Leisure Caspian Limited | Extraterritorial | 1909 |
| Leisure Lexin Limited | Extraterritorial | 1952 |
| Leisure Sinks Limited | Extraterritorial | 1958 |
| Lime Grove Hospitality Limited | Hospitality | 2023 |
| Lincolnshire Commercial Enterprise Limited | Real estate | 2022 |
| Listen UP Ventures Limited | Information & communication | 2020 |
| Little Green Door Property Company Limited | Real estate | 2016 |
| Live and LET Investments Ltd | Real estate | 2022 |
| LJ and LM Business Limited | Wholesale & retail | 2019 |
| Local Exposure Limited | Information & communication | 2009 |
| Long Eaton Cycles Limited | Wholesale & retail | 2014 |
| Long Eaton Fitness Ltd | Arts & recreation | 2026 |
| Long Eaton Sheds and Summerhouses Limited | Manufacturing | 2025 |
| Long Eaton Sofas Limited | Manufacturing | 2018 |
| Long Eaton Swinger Car Valet Ltd | Administrative & support | 2023 |
| Long Eaton Timber Ltd | Wholesale & retail | 2010 |
| Longstaff Consulting Limited | Professional & scientific | 2019 |
| Lotus Capital Group Limited | Financial services | 2024 |
| Loxton Dolby Developments Ltd | Real estate | 2022 |
| Lund Research Ltd | Information & communication | 2005 |
| M P Custom Bikes Ltd | Manufacturing | 2023 |
| M&A Webb Properties Ltd | Real estate | 2016 |
| M.B Environmental Ltd | Construction | 2021 |
| M1 Stairlifts Limited | Health & social care | 2017 |
| M6 Sports Ltd | Information & communication | 2024 |
| Maginlea Golf Limited | Construction | 2024 |
| Management Solutions (Care Homes) Ltd | Professional & scientific | 2021 |
| MAP Invest Limited | Real estate | 2018 |
| Maple Biomass Ltd | Water & waste | 2020 |
| Maple Bridge Management Limited | Real estate | 2023 |
| Maple Tree Care (Midlands) Limited | Construction | 2013 |
| Marco Joinery Holdings Limited | Financial services | 2015 |
| Marco Joinery Limited | Construction | 1990 |
| Margate House Business Centre Limited | Real estate | 2022 |
| Mattsons Properties Ltd | Construction | 2019 |
| MB6 Holdings Limited | Real estate | 2020 |
| MBP Capital Ltd | Real estate | 2024 |
| Mcgrail's Properties Limited | Real estate | 2014 |
| Mcgrath Mortgages Limited | Financial services | 2021 |
| Mchardy Properties Limited | Real estate | 2016 |
| Meadow Lane UK Limited | Wholesale & retail | 1972 |
| Meal Buddy Limited | Information & communication | 2017 |
| Meera Ventures Ltd | Health & social care | 2024 |
| Mercury Appliances Limited | Extraterritorial | 1979 |
| Merlin Online Marketing Limited | Professional & scientific | 2021 |
| Messy Minds Life Limited | Other services | 2025 |
| Michael a Key Automobile Engineering Limited | Wholesale & retail | 2008 |
| Michael Alexander Sourcing Limited | Real estate | 2020 |
| Michael D Long Limited | Wholesale & retail | 1984 |
| Microtrax Designs Limited | Manufacturing | 2003 |
| Middleby UK Residential Holding 1 Ltd | Financial services | 2025 |
| Middleby UK Residential Holding 2 Ltd | Financial services | 2025 |
| Midland Wiper Manufacturing Company Limited | Manufacturing | 1915 |
| Mike Ayres Design Limited | Manufacturing | 1998 |
| Milico Business Services Ltd | Professional & scientific | 2019 |
| Milico Limited | Professional & scientific | 2012 |
| Military Swords Limited | Wholesale & retail | 2006 |
| Mini First AID Nottingham and Derby Limited | Other services | 2022 |
| Mistral Property Limited | Real estate | 2022 |
| MJO Property Development Limited | Real estate | 2024 |
| Momenta Property Solutions Ltd | Real estate | 2013 |
| Moneygaps Ltd | Professional & scientific | 2024 |
| Monthly Income UK Holdings Ltd | Financial services | 2024 |
| Moorway Clinical Services Limited | Health & social care | 2023 |
| Morehen Company Limited | Real estate | 2018 |
| Motor Time Group Ltd | Wholesale & retail | 2023 |
| Motorclub Vehicle Movements Limited | Wholesale & retail | 2023 |
| Moxley Road Limited | Extraterritorial | 1914 |
| Mrulettings Limited | Real estate | 2023 |
| MWP Properties Limited | Real estate | 2019 |
| My Aberdeen Property Ltd | Real estate | 2024 |
| My Aberdeen Property Services Limited | Real estate | 2024 |
| My Build Pro Holdings 2 Ltd | Real estate | 2025 |
| My Build Pro Investments Ltd | Real estate | 2024 |
| N S Duncan Limited | Health & social care | 2017 |
| N.P. Services and Hire Ltd | Administrative & support | 2025 |
| Najah Investments Limited | Real estate | 2017 |
| Nati AV Ltd | Wholesale & retail | 2024 |
| Needham Medical Services Limited | Health & social care | 2020 |
| Neko Nihon Ltd | Professional & scientific | 2025 |
| Nestegg Rentals Partners Limited | Real estate | 2021 |
| New Living Design Limited | Construction | 2016 |
| New Sheldon Limited | Extraterritorial | 1969 |
| Newton Heath Cabinet Furniture Limited | Manufacturing | 2015 |
| Nid's Kitchen Limited | Real estate | 2019 |
| Nightingale Nurseries Limited | Education | 2001 |
| NLT Integral Limited | Wholesale & retail | 1986 |
| Northcliffe Investments Limited | Administrative & support | 2012 |
| Northern Line Properties Limited | Real estate | 2018 |
| Notlad Group Ltd | Financial services | 2025 |
| Nottingham Narrow Fabrics Limited | Manufacturing | 1999 |
| Nzino Properties Ltd | Real estate | 2019 |